mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 10:28:55 +01:00
2411 lines
46 KiB
C++
2411 lines
46 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <ircd/asio.h>
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namespace ircd::server
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{
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// Internal state
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bool ready; // like an /etc/nologin to prevent actions when false.
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ctx::dock dock; // internal semaphore
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// Internal util
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template<class F> size_t accumulate_peers(F&&);
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template<class F> size_t accumulate_links(F&&);
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template<class F> size_t accumulate_tags(F&&);
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// Internal control
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std::unique_ptr<peer> create(const net::hostport &);
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void interrupt_all();
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void close_all();
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void wait_all();
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}
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decltype(ircd::server::log)
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ircd::server::log
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{
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"server", 'S'
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};
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decltype(ircd::server::peers)
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ircd::server::peers
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{};
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ircd::conf::item<ircd::seconds>
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close_all_timeout
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{
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{ "name", "ircd.server.close_all_timeout" },
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{ "default", 2L },
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};
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void
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ircd::server::wait_all()
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{
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while(peer_unfinished())
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{
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if(dock.wait_for(seconds(2)) == ctx::cv_status::no_timeout)
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continue;
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log.warning("Waiting for %zu tags on %zu links on %zu of %zu peers to close...",
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tag_count(),
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link_count(),
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peer_unfinished(),
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peer_count());
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}
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}
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void
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ircd::server::close_all()
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{
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log.debug("Closing all %zu peers",
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peer_count());
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net::close_opts opts;
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opts.timeout = seconds(close_all_timeout);
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for(auto &peer : peers)
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peer.second->close(opts);
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}
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void
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ircd::server::interrupt_all()
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{
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log.debug("Interrupting %zu tags on %zu links on %zu peers",
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tag_count(),
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link_count(),
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peer_count());
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for(auto &peer : peers)
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peer.second->interrupt();
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}
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ircd::server::peer &
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ircd::server::get(const net::hostport &hostport)
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{
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auto it(peers.lower_bound(host(hostport)));
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if(it == peers.end() || it->first != host(hostport))
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{
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auto peer{create(hostport)};
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log.debug("peer(%p) for %s created; adding...",
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peer.get(),
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string(hostport));
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const string_view key{peer->remote.hostname};
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it = peers.emplace_hint(it, key, std::move(peer));
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}
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return *it->second;
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}
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std::unique_ptr<ircd::server::peer>
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ircd::server::create(const net::hostport &hostport)
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{
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auto peer(std::make_unique<peer>());
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peer->remote.hostname = std::string{host(hostport)};
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peer->resolve(hostport);
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return peer;
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}
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ircd::server::peer &
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ircd::server::find(const net::hostport &hostport)
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{
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return *peers.at(host(hostport));
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}
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bool
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ircd::server::exists(const net::hostport &hostport)
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{
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return peers.find(host(hostport)) != end(peers);
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}
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ircd::string_view
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ircd::server::errmsg(const net::hostport &hostport)
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{
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const auto it
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{
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peers.find(host(hostport))
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};
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if(it == end(peers))
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return {};
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return it->second->err_msg();
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}
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size_t
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ircd::server::peer_unfinished()
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{
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return accumulate_peers([]
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(const auto &peer)
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{
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return !peer.finished();
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});
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}
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size_t
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ircd::server::peer_count()
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{
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return peers.size();
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}
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size_t
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ircd::server::link_count()
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{
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return accumulate_peers([]
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(const auto &peer)
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{
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return peer.link_count();
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});
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}
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size_t
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ircd::server::tag_count()
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{
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return accumulate_peers([]
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(const auto &peer)
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{
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return peer.tag_count();
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});
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}
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template<class F>
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size_t
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ircd::server::accumulate_tags(F&& closure)
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{
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return accumulate_links([&closure]
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(const auto &link)
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{
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return link.accumulate_tags(std::forward<F>(closure));
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});
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}
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template<class F>
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size_t
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ircd::server::accumulate_links(F&& closure)
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{
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return accumulate_peers([&closure]
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(const auto &peer)
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{
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return peer.accumulate_links(std::forward<F>(closure));
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});
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}
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template<class F>
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size_t
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ircd::server::accumulate_peers(F&& closure)
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{
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return std::accumulate(begin(peers), end(peers), size_t(0), [&closure]
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(auto ret, const auto &pair)
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{
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const auto &peer{*pair.second};
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return ret += closure(peer);
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});
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}
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//
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// init
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//
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ircd::server::init::init()
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{
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ready = true;
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}
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ircd::server::init::~init()
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noexcept
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{
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close();
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wait();
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peers.clear();
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}
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void
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ircd::server::init::wait()
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{
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wait_all();
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}
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void
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ircd::server::init::close()
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{
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ready = false;
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close_all();
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}
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void
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ircd::server::init::interrupt()
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{
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interrupt_all();
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}
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///
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// request
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//
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decltype(ircd::server::request::opts_default)
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ircd::server::request::opts_default
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{};
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/// Canceling a request is tricky. This allows a robust way to let the user's
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/// request go out of scope at virtually any time without disrupting the
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/// pipeline and other requests.
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bool
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ircd::server::cancel(request &request)
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{
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if(!request.tag)
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return false;
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if(request.tag->canceled())
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return false;
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if(request.tag->abandoned())
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return false;
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auto &tag
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{
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*request.tag
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};
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/*
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log.debug("cancel request(%p) tag(%p) commit:%d w:%zu hr:%zu cr:%zu",
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&request,
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&tag,
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tag.committed(),
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tag.written,
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tag.head_read,
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tag.content_read);
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*/
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// We got off easy... The link's write loop won't start an abandoned
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// request. All that has to be done is indicate a full cancellation
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// immediately and the user will know nothing was revealed to the remote.
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if(!tag.committed())
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{
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tag.set_exception(canceled
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{
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"Request canceled"
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});
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return true;
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}
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// Now things aren't so easy. More complicated logic happens inside...
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cancel(request, tag);
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return true;
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}
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void
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ircd::server::submit(const hostport &hostport,
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request &request)
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{
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if(unlikely(!server::ready))
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throw unavailable
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{
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"Unable to fulfill requests at this time."
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};
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assert(request.tag == nullptr);
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auto &peer(server::get(hostport));
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peer.submit(request);
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}
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//
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// peer
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//
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decltype(ircd::server::peer::link_min_default)
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ircd::server::peer::link_min_default
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{
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{ "name", "ircd.server.peer.link_min" },
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{ "default", 1L }
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};
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decltype(ircd::server::peer::link_max_default)
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ircd::server::peer::link_max_default
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{
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{ "name", "ircd.server.peer.link_max" },
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{ "default", 2L }
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};
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//
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// peer::peer
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//
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ircd::server::peer::peer()
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{
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}
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ircd::server::peer::~peer()
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noexcept
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{
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assert(links.empty());
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}
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void
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ircd::server::peer::close(const net::close_opts &opts)
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{
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op_fini = true;
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std::vector<link *> links(this->links.size());
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pointers(this->links, links);
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for(const auto &link : links)
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link->close(opts);
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if(finished())
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return handle_finished();
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}
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void
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ircd::server::peer::interrupt()
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{
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for(auto &link : this->links)
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link.cancel_all(std::make_exception_ptr(canceled
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{
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"Request was aborted due to interruption."
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}));
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}
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void
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ircd::server::peer::err_clear()
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{
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e.reset(nullptr);
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}
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template<class... A>
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void
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ircd::server::peer::err_set(A&&... args)
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{
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this->e = std::make_unique<err>(std::forward<A>(args)...);
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}
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ircd::string_view
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ircd::server::peer::err_msg()
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const
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{
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return bool(e)? what(e->eptr) : string_view{};
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}
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bool
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ircd::server::peer::err_has()
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const
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{
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return bool(e);
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}
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decltype(ircd::server::peer::error_clear_default)
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ircd::server::peer::error_clear_default
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{
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{ "name", "ircd.server.peer.error.clear_default" },
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{ "default", 305L }
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};
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bool
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ircd::server::peer::err_check()
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{
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if(op_fini)
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return false;
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if(!e)
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return true;
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//TODO: The specific error type should be switched and finer
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//TODO: timeouts should be used depending on the error: i.e
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//TODO: NXDOMAIN vs. temporary conn timeout, etc.
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if(e->etime + seconds(error_clear_default) > now<steady_point>())
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return false;
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err_clear();
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return true;
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}
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void
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ircd::server::peer::submit(request &request)
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try
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{
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if(!err_check() || unlikely(!server::ready))
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throw unavailable
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{
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"Peer is unable to take any requests: %s", err_msg()
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};
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link *const ret
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{
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link_get(request)
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};
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if(likely(ret))
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{
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ret->submit(request);
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return;
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}
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if(!request.tag)
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throw unavailable
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{
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"No link to peer %s available", remote.hostname
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};
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else
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request.tag->set_exception(unavailable
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{
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"No link to peer %s available", remote.hostname
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});
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}
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catch(const std::exception &e)
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{
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if(request.tag)
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request.tag->set_exception(std::current_exception());
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else
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throw;
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}
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/// Dispatch algorithm here; finds the best link to place this request on,
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/// or creates a new link entirely. There are a number of factors: foremost
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/// if any special needs are indicated,
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//
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ircd::server::link *
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ircd::server::peer::link_get(const request &request)
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{
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if(links.empty())
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return &link_add(1);
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// Indicates that we can't add anymore links for this peer and the rest
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// of the algorithm should consider this.
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const bool links_maxed
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{
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links.size() >= link_max()
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};
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link *best{nullptr};
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for(auto &cand : links)
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{
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// Don't want a link that's shutting down or marked for exclusion
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if(cand.op_fini || cand.exclude)
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continue;
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if(!best)
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{
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best = &cand;
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continue;
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}
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// Indicates that the best candidate has its pipe saturated which can
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// be factored into the comparisons here.
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const bool best_maxed
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{
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best->tag_committed() >= best->tag_commit_max()
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};
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const bool cand_maxed
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{
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cand.tag_committed() >= cand.tag_commit_max()
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};
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if(best_maxed && !cand_maxed)
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{
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best = &cand;
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continue;
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}
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if(!best_maxed && cand_maxed)
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continue;
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// Candidates's queue has less or same backlog of unsent requests, but
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// now measure if candidate will take longer to process at least the
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// write-side of those requests.
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if(cand.write_remaining() > best->write_remaining())
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continue;
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// Candidate might be working through really large content; though
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// this is a very sketchy measurement right now since we only *might*
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// know about content-length for the *one* active tag occupying the
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// socket.
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if(cand.read_remaining() > best->read_remaining())
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continue;
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// Coarse distribution based on who has more work; this is weak, should
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// be replaced.
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if(cand.tag_count() > best->tag_count())
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continue;
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best = &cand;
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}
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if(links_maxed)
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return best;
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// best might not be good enough, we could try another connection. If best
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// has a backlog or is working on a large download or slow request.
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if(!best)
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{
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best = &link_add();
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return best;
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}
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if(best->tag_uncommitted() < best->tag_commit_max())
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return best;
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best = &link_add();
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return best;
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}
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ircd::server::link &
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ircd::server::peer::link_add(const size_t &num)
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{
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if(e)
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std::rethrow_exception(e->eptr);
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assert(!op_fini);
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links.emplace_back(*this);
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auto &link{links.back()};
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if(remote.resolved())
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link.open(remote);
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return link;
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}
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void
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ircd::server::peer::handle_open(link &link,
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std::exception_ptr eptr)
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{
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if(eptr)
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{
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if(links.size() == 1)
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err_set(eptr);
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log.error("peer(%p) link(%p) [%s]: open: %s",
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this,
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&link,
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string(remote),
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what(eptr));
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link.close(net::dc::RST);
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return;
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}
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}
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void
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ircd::server::peer::handle_close(link &link,
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std::exception_ptr eptr)
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{
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if(eptr)
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log.error("peer(%p) link(%p) [%s]: close: %s",
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this,
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&link,
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string(remote),
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what(eptr));
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if(link.finished())
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handle_finished(link);
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}
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void
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ircd::server::peer::handle_error(link &link,
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std::exception_ptr eptr)
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{
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assert(bool(eptr));
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link.cancel_committed(eptr);
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log.error("peer(%p) link(%p): %s",
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this,
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&link,
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what(eptr));
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link.close(net::dc::RST);
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}
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|
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void
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ircd::server::peer::handle_error(link &link,
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const boost::system::system_error &e)
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{
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using namespace boost::system::errc;
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using boost::system::system_category;
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using boost::asio::error::get_misc_category;
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|
|
const auto &ec{e.code()};
|
|
if(ec.category() == system_category()) switch(ec.value())
|
|
{
|
|
case success:
|
|
assert(0);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
else if(ec.category() == get_misc_category()) switch(ec.value())
|
|
{
|
|
case asio::error::eof:
|
|
log.debug("peer(%p) link(%p) [%s]: %s",
|
|
this,
|
|
&link,
|
|
string(remote),
|
|
e.what());
|
|
|
|
link.close(net::close_opts_default);
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
log.error("peer(%p) link(%p) [%s]: error: %s",
|
|
this,
|
|
&link,
|
|
string(remote),
|
|
e.what());
|
|
|
|
link.cancel_committed(std::make_exception_ptr(e));
|
|
link.close(net::dc::RST);
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::handle_finished(link &link)
|
|
{
|
|
assert(link.finished());
|
|
del(link);
|
|
|
|
if(finished())
|
|
handle_finished();
|
|
}
|
|
|
|
/// This is where we're notified a tag has been completed either to start the
|
|
/// next request when the link has too many requests in flight or perhaps to
|
|
/// reschedule the queues in various links to diffuse the pending requests.
|
|
/// This can't throw because the link still has to remove this tag from its
|
|
/// queue.
|
|
void
|
|
ircd::server::peer::handle_tag_done(link &link,
|
|
tag &tag)
|
|
noexcept try
|
|
{
|
|
if(link.tag_committed() >= link.tag_commit_max())
|
|
link.wait_writable();
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log.critical("peer(%p) link(%p) tag(%p) done; error: %s",
|
|
this,
|
|
&link,
|
|
&tag,
|
|
e.what());
|
|
}
|
|
|
|
/// This is where we're notified a link has processed its queue and has no
|
|
/// more work. We can choose whether to close the link or keep it open and
|
|
/// reinstate the read poll; reschedule other work to this link, etc.
|
|
void
|
|
ircd::server::peer::handle_link_done(link &link)
|
|
{
|
|
assert(link.tag_count() == 0);
|
|
|
|
if(link_ready() > link_min())
|
|
{
|
|
link.close();
|
|
return;
|
|
}
|
|
|
|
link.wait_readable();
|
|
}
|
|
|
|
/// This is called when a tag on a link receives an HTTP response head.
|
|
/// We can use this to learn information from the tag's request and the
|
|
/// response head etc.
|
|
void
|
|
ircd::server::peer::handle_head_recv(const link &link,
|
|
const tag &tag,
|
|
const http::response::head &head)
|
|
{
|
|
// Learn the software version of the remote peer so we can shape
|
|
// requests more effectively.
|
|
if(!server_name && head.server)
|
|
{
|
|
server_name = std::string{head.server};
|
|
log.debug("peer(%p) learned %s is '%s'",
|
|
this,
|
|
string(remote),
|
|
server_name);
|
|
}
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::disperse(link &link)
|
|
{
|
|
disperse_uncommitted(link);
|
|
link.cancel_committed(std::make_exception_ptr(canceled
|
|
{
|
|
"Request was aborted; though it was partially completed"
|
|
}));
|
|
|
|
assert(link.queue.empty());
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::disperse_uncommitted(link &link)
|
|
{
|
|
auto &queue(link.queue);
|
|
auto it(begin(queue));
|
|
while(it != end(queue)) try
|
|
{
|
|
auto &tag{*it};
|
|
if(!tag.request || tag.committed())
|
|
{
|
|
++it;
|
|
continue;
|
|
}
|
|
|
|
submit(*tag.request);
|
|
it = queue.erase(it);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
const auto &tag{*it};
|
|
log.warning("peer(%p) failed to resubmit tag(%p): %s",
|
|
this,
|
|
&tag,
|
|
e.what());
|
|
|
|
it = queue.erase(it);
|
|
}
|
|
}
|
|
|
|
/// This *cannot* be called unless a link's socket is closed and its queue
|
|
/// is empty. It is usually only called by a disconnect handler because
|
|
/// the proper way to remove a link is asynchronously through link.close();
|
|
void
|
|
ircd::server::peer::del(link &link)
|
|
{
|
|
assert(!link.tag_count());
|
|
assert(!link.opened());
|
|
const auto it(std::find_if(begin(links), end(links), [&link]
|
|
(const auto &link_)
|
|
{
|
|
return &link_ == &link;
|
|
}));
|
|
|
|
assert(it != end(links));
|
|
log.debug("peer(%p) removing link(%p) %zu of %zu to %s",
|
|
this,
|
|
&link,
|
|
std::distance(begin(links), it),
|
|
links.size(),
|
|
string(remote));
|
|
|
|
links.erase(it);
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::resolve(const hostport &hostport)
|
|
{
|
|
if(op_resolve || op_fini)
|
|
return;
|
|
|
|
auto handler
|
|
{
|
|
std::bind(&peer::handle_resolve, this, ph::_1, ph::_2)
|
|
};
|
|
|
|
op_resolve = true;
|
|
net::dns(hostport, std::move(handler));
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::handle_resolve(std::exception_ptr eptr,
|
|
const ipport &ipport)
|
|
try
|
|
{
|
|
op_resolve = false;
|
|
|
|
if(eptr)
|
|
{
|
|
err_set(eptr);
|
|
std::rethrow_exception(eptr);
|
|
}
|
|
|
|
static_cast<net::ipport &>(this->remote) = ipport;
|
|
|
|
if(unlikely(finished()))
|
|
return handle_finished();
|
|
|
|
if(!op_fini)
|
|
for(auto &link : links)
|
|
link.open(this->remote);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log.error("peer(%p): error: %s",
|
|
this,
|
|
e.what());
|
|
close();
|
|
}
|
|
|
|
void
|
|
ircd::server::peer::handle_finished()
|
|
{
|
|
assert(finished());
|
|
|
|
// Right now this is what the server:: ~init sequence needs
|
|
// to wait for all links to close on IRCd shutdown.
|
|
server::dock.notify_all();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::read_remaining()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.read_remaining();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::read_completed()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.read_completed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::read_total()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.read_total();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::write_remaining()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.write_remaining();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::write_completed()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.write_completed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::write_total()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.write_total();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::tag_uncommitted()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.tag_uncommitted();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::tag_committed()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.tag_committed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::tag_count()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.tag_count();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::link_ready()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.ready();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::link_busy()
|
|
const
|
|
{
|
|
return accumulate_links([](const auto &link)
|
|
{
|
|
return link.busy();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::link_count()
|
|
const
|
|
{
|
|
return links.size();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::link_min()
|
|
const
|
|
{
|
|
return link_min_default;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::peer::link_max()
|
|
const
|
|
{
|
|
return link_max_default;
|
|
}
|
|
|
|
bool
|
|
ircd::server::peer::finished()
|
|
const
|
|
{
|
|
return links.empty() && !op_resolve && op_fini;
|
|
}
|
|
|
|
template<class F>
|
|
size_t
|
|
ircd::server::peer::accumulate_tags(F&& closure)
|
|
const
|
|
{
|
|
return accumulate_links([&closure](const auto &link)
|
|
{
|
|
return link.accumulate([&closure](const auto &tag)
|
|
{
|
|
return closure(tag);
|
|
});
|
|
});
|
|
}
|
|
|
|
template<class F>
|
|
size_t
|
|
ircd::server::peer::accumulate_links(F&& closure)
|
|
const
|
|
{
|
|
return std::accumulate(begin(links), end(links), size_t(0), [&closure]
|
|
(auto ret, const auto &tag)
|
|
{
|
|
return ret += closure(tag);
|
|
});
|
|
}
|
|
|
|
//
|
|
// link
|
|
//
|
|
|
|
decltype(ircd::server::link::tag_max_default)
|
|
ircd::server::link::tag_max_default
|
|
{
|
|
{ "name", "ircd.server.link.tag_max" },
|
|
{ "default", -1L }
|
|
};
|
|
|
|
decltype(ircd::server::link::tag_commit_max_default)
|
|
ircd::server::link::tag_commit_max_default
|
|
{
|
|
{ "name", "ircd.server.link.tag_commit_max" },
|
|
{ "default", 3L }
|
|
};
|
|
|
|
//
|
|
// link::link
|
|
//
|
|
|
|
ircd::server::link::link(server::peer &peer)
|
|
:peer{&peer}
|
|
{
|
|
}
|
|
|
|
ircd::server::link::~link()
|
|
noexcept
|
|
{
|
|
assert(!busy());
|
|
assert(!opened());
|
|
}
|
|
|
|
void
|
|
ircd::server::link::submit(request &request)
|
|
{
|
|
assert(!request.tag || !request.tag->committed());
|
|
|
|
const auto it
|
|
{
|
|
request.tag? queue.emplace(end(queue), std::move(*request.tag)):
|
|
queue.emplace(end(queue), request)
|
|
};
|
|
|
|
if(ready())
|
|
wait_writable();
|
|
}
|
|
|
|
void
|
|
ircd::server::link::cancel_all(std::exception_ptr eptr)
|
|
{
|
|
for(auto it(begin(queue)); it != end(queue); it = queue.erase(it))
|
|
{
|
|
auto &tag{*it};
|
|
if(!tag.request)
|
|
continue;
|
|
|
|
tag.set_exception(eptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
ircd::server::link::cancel_committed(std::exception_ptr eptr)
|
|
{
|
|
for(auto it(begin(queue)); it != end(queue); it = queue.erase(it))
|
|
{
|
|
auto &tag{*it};
|
|
if(!tag.request)
|
|
continue;
|
|
|
|
if(!tag.committed())
|
|
break;
|
|
|
|
tag.set_exception(eptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
ircd::server::link::cancel_uncommitted(std::exception_ptr eptr)
|
|
{
|
|
auto it(begin(queue));
|
|
while(it != end(queue))
|
|
{
|
|
auto &tag{*it};
|
|
if(!tag.request || tag.committed())
|
|
{
|
|
++it;
|
|
continue;
|
|
}
|
|
|
|
tag.set_exception(eptr);
|
|
it = queue.erase(it);
|
|
}
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::open(const net::open_opts &open_opts)
|
|
{
|
|
assert(server::ready);
|
|
|
|
if(op_init)
|
|
return false;
|
|
|
|
auto handler
|
|
{
|
|
std::bind(&link::handle_open, this, ph::_1)
|
|
};
|
|
|
|
op_init = true;
|
|
const unwind::exceptional unhandled{[this]
|
|
{
|
|
op_init = false;
|
|
}};
|
|
|
|
socket = net::open(open_opts, std::move(handler));
|
|
return true;
|
|
}
|
|
|
|
void
|
|
ircd::server::link::handle_open(std::exception_ptr eptr)
|
|
{
|
|
assert(op_init);
|
|
op_init = false;
|
|
|
|
if(!eptr && !op_fini)
|
|
wait_writable();
|
|
|
|
if(peer)
|
|
peer->handle_open(*this, std::move(eptr));
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::close(const net::close_opts &close_opts)
|
|
{
|
|
if(op_fini)
|
|
return false;
|
|
|
|
op_fini = true;
|
|
|
|
// Tell the peer to ditch everything in the queue; op_fini has been set so
|
|
// the tags won't get assigned back to this link.
|
|
if(tag_count() && peer)
|
|
peer->disperse(*this);
|
|
|
|
auto handler
|
|
{
|
|
std::bind(&link::handle_close, this, ph::_1)
|
|
};
|
|
|
|
if(!socket)
|
|
{
|
|
handler(std::exception_ptr{});
|
|
return true;
|
|
}
|
|
|
|
net::close(*socket, close_opts, std::move(handler));
|
|
return true;
|
|
}
|
|
|
|
void
|
|
ircd::server::link::handle_close(std::exception_ptr eptr)
|
|
{
|
|
assert(op_fini);
|
|
|
|
if(op_init)
|
|
{
|
|
assert(bool(eptr));
|
|
op_init = false;
|
|
}
|
|
|
|
if(peer)
|
|
peer->handle_close(*this, std::move(eptr));
|
|
}
|
|
|
|
void
|
|
ircd::server::link::wait_writable()
|
|
{
|
|
if(op_write || unlikely(op_fini))
|
|
return;
|
|
|
|
auto handler
|
|
{
|
|
std::bind(&link::handle_writable, this, ph::_1)
|
|
};
|
|
|
|
assert(ready());
|
|
op_write = true;
|
|
const unwind::exceptional unhandled{[this]
|
|
{
|
|
op_write = false;
|
|
}};
|
|
|
|
net::wait(*socket, net::ready::WRITE, std::move(handler));
|
|
}
|
|
|
|
void
|
|
ircd::server::link::handle_writable(const error_code &ec)
|
|
try
|
|
{
|
|
using namespace boost::system::errc;
|
|
using boost::system::system_category;
|
|
|
|
op_write = false;
|
|
|
|
if(unlikely(finished()))
|
|
{
|
|
assert(peer);
|
|
return peer->handle_finished(*this);
|
|
}
|
|
|
|
if(ec.category() == system_category()) switch(ec.value())
|
|
{
|
|
case success:
|
|
handle_writable_success();
|
|
return;
|
|
|
|
case operation_canceled:
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
throw boost::system::system_error{ec};
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
assert(peer);
|
|
peer->handle_error(*this, e);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
assert(peer);
|
|
peer->handle_error(*this, std::current_exception());
|
|
}
|
|
|
|
void
|
|
ircd::server::link::handle_writable_success()
|
|
{
|
|
auto it(begin(queue));
|
|
while(it != end(queue))
|
|
{
|
|
auto &tag{*it};
|
|
if((tag.abandoned() || tag.canceled()) && !tag.committed())
|
|
{
|
|
log.debug("link(%p) discarding canceled:%d abandoned:%d uncommitted tag %zu of %zu",
|
|
this,
|
|
tag.canceled(),
|
|
tag.abandoned(),
|
|
tag_committed(),
|
|
tag_count());
|
|
|
|
it = queue.erase(it);
|
|
continue;
|
|
}
|
|
|
|
if(tag_committed() == 0)
|
|
wait_readable();
|
|
|
|
if(!process_write(tag))
|
|
{
|
|
wait_writable();
|
|
break;
|
|
}
|
|
|
|
// Limits the amount of requests in the pipe.
|
|
if(tag_committed() >= tag_commit_max())
|
|
break;
|
|
|
|
++it;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::process_write(tag &tag)
|
|
{
|
|
if(!tag.committed())
|
|
log.debug("link(%p) starting on tag %zu of %zu: wt:%zu",
|
|
this,
|
|
tag_committed(),
|
|
tag_count(),
|
|
tag.write_total());
|
|
|
|
while(tag.write_remaining())
|
|
{
|
|
const const_buffer buffer
|
|
{
|
|
tag.make_write_buffer()
|
|
};
|
|
|
|
assert(!empty(buffer));
|
|
const const_buffer written
|
|
{
|
|
process_write_next(buffer)
|
|
};
|
|
|
|
tag.wrote_buffer(written);
|
|
assert(tag_committed() <= tag_commit_max());
|
|
if(size(written) < size(buffer))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::link::process_write_next(const const_buffer &buffer)
|
|
{
|
|
const size_t bytes
|
|
{
|
|
write_any(*socket, buffer)
|
|
};
|
|
|
|
const const_buffer written
|
|
{
|
|
data(buffer), bytes
|
|
};
|
|
|
|
return written;
|
|
}
|
|
|
|
void
|
|
ircd::server::link::wait_readable()
|
|
{
|
|
if(op_read || unlikely(op_fini))
|
|
return;
|
|
|
|
auto handler
|
|
{
|
|
std::bind(&link::handle_readable, this, ph::_1)
|
|
};
|
|
|
|
assert(ready());
|
|
op_read = true;
|
|
const unwind::exceptional unhandled{[this]
|
|
{
|
|
op_read = false;
|
|
}};
|
|
|
|
net::wait(*socket, net::ready::READ, std::move(handler));
|
|
}
|
|
|
|
void
|
|
ircd::server::link::handle_readable(const error_code &ec)
|
|
try
|
|
{
|
|
using namespace boost::system::errc;
|
|
using boost::system::system_category;
|
|
|
|
op_read = false;
|
|
|
|
if(unlikely(finished()))
|
|
{
|
|
assert(peer);
|
|
return peer->handle_finished(*this);
|
|
}
|
|
|
|
if(ec.category() == system_category()) switch(ec.value())
|
|
{
|
|
case success:
|
|
handle_readable_success();
|
|
return;
|
|
|
|
case operation_canceled:
|
|
return;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
throw boost::system::system_error{ec};
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
assert(peer);
|
|
peer->handle_error(*this, e);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
assert(peer);
|
|
peer->handle_error(*this, std::current_exception());
|
|
}
|
|
|
|
/// Process as many read operations from as many tags as possible
|
|
void
|
|
ircd::server::link::handle_readable_success()
|
|
{
|
|
if(queue.empty())
|
|
return discard_read();
|
|
|
|
// Data pointed to by overrun will remain intact between iterations
|
|
// because this loop isn't executing in any ircd::ctx.
|
|
const_buffer overrun; do
|
|
{
|
|
if(!process_read(overrun))
|
|
{
|
|
wait_readable();
|
|
return;
|
|
}
|
|
}
|
|
while(!queue.empty());
|
|
|
|
assert(peer);
|
|
peer->handle_link_done(*this);
|
|
}
|
|
|
|
/// Process as many read operations for one tag as possible
|
|
bool
|
|
ircd::server::link::process_read(const_buffer &overrun)
|
|
try
|
|
{
|
|
auto &tag
|
|
{
|
|
queue.front()
|
|
};
|
|
|
|
if(!tag.committed())
|
|
{
|
|
// Tag hasn't sent its data yet, we shouldn't have anything for it
|
|
assert(empty(overrun));
|
|
return false;
|
|
}
|
|
|
|
bool done{false}; do
|
|
{
|
|
overrun = process_read_next(overrun, tag, done);
|
|
}
|
|
while(!done);
|
|
|
|
assert(peer);
|
|
peer->handle_tag_done(*this, queue.front());
|
|
queue.pop_front();
|
|
return true;
|
|
}
|
|
catch(const buffer_overrun &e)
|
|
{
|
|
queue.pop_front();
|
|
throw;
|
|
}
|
|
catch(const boost::system::system_error &e)
|
|
{
|
|
using namespace boost::system::errc;
|
|
|
|
switch(e.code().value())
|
|
{
|
|
case resource_unavailable_try_again:
|
|
return false;
|
|
|
|
case success:
|
|
assert(0);
|
|
return true;
|
|
|
|
default:
|
|
throw;
|
|
}
|
|
}
|
|
|
|
/// Process one read operation for one tag
|
|
ircd::const_buffer
|
|
ircd::server::link::process_read_next(const const_buffer &underrun,
|
|
tag &tag,
|
|
bool &done)
|
|
try
|
|
{
|
|
const mutable_buffer buffer
|
|
{
|
|
tag.make_read_buffer()
|
|
};
|
|
|
|
const size_t copied
|
|
{
|
|
copy(buffer, underrun)
|
|
};
|
|
|
|
const mutable_buffer remaining
|
|
{
|
|
data(buffer) + copied, size(buffer) - copied
|
|
};
|
|
|
|
const size_t received
|
|
{
|
|
read_one(*socket, remaining)
|
|
};
|
|
|
|
const const_buffer view
|
|
{
|
|
data(buffer), copied + received
|
|
};
|
|
|
|
const const_buffer overrun
|
|
{
|
|
tag.read_buffer(view, done, *this)
|
|
};
|
|
|
|
assert(done || empty(overrun));
|
|
return overrun;
|
|
}
|
|
catch(const buffer_overrun &e)
|
|
{
|
|
tag.set_exception(e);
|
|
throw;
|
|
}
|
|
|
|
void
|
|
ircd::server::link::discard_read()
|
|
{
|
|
const size_t discard
|
|
{
|
|
available(*socket)
|
|
};
|
|
|
|
const size_t discarded
|
|
{
|
|
discard_any(*socket, discard)
|
|
};
|
|
|
|
// Shouldn't ever be hit because the read() within discard() throws
|
|
// the pending error like an eof.
|
|
log.warning("Link to %s discarded %zu of %zu unexpected bytes",
|
|
likely(peer)? string(peer->remote) : string(remote_ipport(*socket)),
|
|
discard,
|
|
discarded);
|
|
|
|
// just in case so this doesn't get loopy with discarding zero with
|
|
// an empty queue...
|
|
if(unlikely(!discard || !discarded))
|
|
throw assertive
|
|
{
|
|
"peer(%p) link(%p) queue is empty and nothing to discard.",
|
|
peer,
|
|
this
|
|
};
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::tag_uncommitted()
|
|
const
|
|
{
|
|
return tag_count() - tag_committed();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::tag_committed()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.committed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::tag_count()
|
|
const
|
|
{
|
|
return queue.size();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::read_remaining()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.read_remaining();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::read_completed()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.read_completed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::read_total()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.read_total();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::write_remaining()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.write_remaining();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::write_completed()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.write_completed();
|
|
});
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::write_total()
|
|
const
|
|
{
|
|
return accumulate_tags([](const auto &tag)
|
|
{
|
|
return tag.write_total();
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::busy()
|
|
const
|
|
{
|
|
return !queue.empty();
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::ready()
|
|
const
|
|
{
|
|
return opened() && !op_init && !op_fini;
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::opened()
|
|
const noexcept
|
|
{
|
|
return bool(socket) && net::opened(*socket);
|
|
}
|
|
|
|
bool
|
|
ircd::server::link::finished()
|
|
const
|
|
{
|
|
if(!bool(socket))
|
|
return false;
|
|
|
|
return !opened() && op_fini && !op_init && !op_write && !op_read;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::tag_commit_max()
|
|
const
|
|
{
|
|
return tag_commit_max_default;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::link::tag_max()
|
|
const
|
|
{
|
|
return tag_max_default;
|
|
}
|
|
|
|
template<class F>
|
|
size_t
|
|
ircd::server::link::accumulate_tags(F&& closure)
|
|
const
|
|
{
|
|
return std::accumulate(begin(queue), end(queue), size_t(0), [&closure]
|
|
(auto ret, const auto &tag)
|
|
{
|
|
return ret += closure(tag);
|
|
});
|
|
}
|
|
|
|
//
|
|
// tag
|
|
//
|
|
|
|
/// This is tricky. When a user cancels a request which has committed some
|
|
/// writes to the remote we have to continue to service it through to
|
|
/// completion without disrupting the linearity of the link's pipeline
|
|
/// and causing trouble with other requests. This all depends on what phase
|
|
/// the request is currently in.
|
|
///
|
|
/// In any case, the goal here is to swap out the user's request buffers
|
|
/// and replace them with cancellation buffers which will be transparent
|
|
/// to the link as it completes the request.
|
|
void
|
|
ircd::server::cancel(request &request,
|
|
tag &tag)
|
|
noexcept
|
|
{
|
|
// Must have a fully associated request/tag which has committed some
|
|
// data to the wire to enter this routine.
|
|
assert(tag.committed());
|
|
assert(request.tag == &tag);
|
|
assert(tag.request == &request);
|
|
|
|
// Disassociate the user's request and add our dummy request in its place.
|
|
|
|
request.tag = nullptr;
|
|
tag.request = new server::request{};
|
|
tag.request->tag = &tag;
|
|
|
|
// Setup the cancellation buffers by mirroring the current state of the
|
|
// user's buffers.
|
|
|
|
const size_t cancellation_size
|
|
{
|
|
size(request.out) + size(request.in)
|
|
};
|
|
|
|
tag.cancellation = std::make_unique<char[]>(cancellation_size);
|
|
char *ptr{tag.cancellation.get()};
|
|
|
|
const mutable_buffer out_head{ptr, size(request.out.head)};
|
|
tag.request->out.head = out_head;
|
|
ptr += size(out_head);
|
|
|
|
const mutable_buffer out_content{ptr, size(request.out.content)};
|
|
tag.request->out.content = out_content;
|
|
ptr += size(out_content);
|
|
|
|
const mutable_buffer in_head{ptr, size(request.in.head)};
|
|
tag.request->in.head = in_head;
|
|
ptr += size(in_head);
|
|
|
|
const mutable_buffer in_content{ptr, size(request.in.content)};
|
|
tag.request->in.content = in_content;
|
|
ptr += size(in_content);
|
|
|
|
assert(size_t(std::distance(tag.cancellation.get(), ptr)) == cancellation_size);
|
|
|
|
// If the head is not completely written we have to copy the remainder from where
|
|
// the socket left off.
|
|
if(tag.written < size(request.out.head))
|
|
{
|
|
const const_buffer src
|
|
{
|
|
data(request.out.head) + tag.written, size(request.out.head) - tag.written
|
|
};
|
|
|
|
const mutable_buffer dst
|
|
{
|
|
data(out_head) + tag.written, size(src)
|
|
};
|
|
|
|
copy(dst, src);
|
|
}
|
|
|
|
// If the content is not completely written we have to copy the remainder from where
|
|
// the socket left off.
|
|
const size_t content_written
|
|
{
|
|
tag.written > size(request.out.head)? tag.written - size(request.out.head) : 0
|
|
};
|
|
|
|
if(content_written < size(request.out.content))
|
|
{
|
|
const const_buffer src
|
|
{
|
|
data(request.out.content) + content_written, size(request.out.content) - content_written
|
|
};
|
|
|
|
const mutable_buffer dst
|
|
{
|
|
data(out_content) + content_written, size(src)
|
|
};
|
|
|
|
copy(dst, src);
|
|
}
|
|
|
|
// If the head is not completely read we have to copy what's been received so far so
|
|
// we can parse a coherent head.
|
|
if(tag.head_read > 0 && tag.head_read < size(request.in.head))
|
|
{
|
|
const const_buffer src
|
|
{
|
|
data(request.in.head), tag.head_read
|
|
};
|
|
|
|
const mutable_buffer dst
|
|
{
|
|
data(in_head), size(src)
|
|
};
|
|
|
|
copy(dst, src);
|
|
}
|
|
|
|
// No received content is copied.
|
|
}
|
|
|
|
void
|
|
ircd::server::associate(request &request,
|
|
tag &tag)
|
|
{
|
|
assert(request.tag == nullptr);
|
|
assert(tag.request == nullptr);
|
|
|
|
auto &future
|
|
{
|
|
static_cast<ctx::future<http::code> &>(request)
|
|
};
|
|
|
|
future = tag.p;
|
|
request.tag = &tag;
|
|
tag.request = &request;
|
|
}
|
|
|
|
void
|
|
ircd::server::associate(request &request,
|
|
tag &cur,
|
|
tag &&old)
|
|
noexcept
|
|
{
|
|
assert(request.tag == &old); // ctor moved
|
|
assert(cur.request == &request); // ctor moved
|
|
assert(old.request == &request); // ctor didn't trash old
|
|
|
|
cur.request = &request;
|
|
old.request = nullptr;
|
|
request.tag = &cur;
|
|
}
|
|
|
|
void
|
|
ircd::server::associate(request &cur,
|
|
tag &tag,
|
|
request &&old)
|
|
noexcept
|
|
{
|
|
assert(tag.request == &old); // ctor already moved
|
|
assert(cur.tag == &tag); // ctor already moved
|
|
assert(old.tag == &tag); // ctor didn't trash old
|
|
|
|
cur.tag = &tag;
|
|
tag.request = &cur;
|
|
old.tag = nullptr;
|
|
}
|
|
|
|
void
|
|
ircd::server::disassociate(request &request,
|
|
tag &tag)
|
|
{
|
|
assert(request.tag == &tag);
|
|
assert(tag.request == &request);
|
|
|
|
request.tag = nullptr;
|
|
tag.request = nullptr;
|
|
|
|
// If the original request was canceled a new request was attached in its
|
|
// place in addition to an cancellation buffer. The existence of this
|
|
// cancellation buffer indicates that we must delete the request here.
|
|
// This is a little hacky but it gets the job done.
|
|
if(bool(tag.cancellation))
|
|
delete &request;
|
|
}
|
|
|
|
/// Called by the controller of the socket with a view of the data received by
|
|
/// the socket. The location and size of `buffer` is the same or smaller than
|
|
/// the buffer previously supplied by make_read_buffer().
|
|
///
|
|
/// Sometimes make_read_buffer() supplies a buffer that is too large, and some
|
|
/// data read off the socket does not belong to this tag. In that case, This
|
|
/// function returns a const_buffer viewing the portion of `buffer` which is
|
|
/// considered the "overrun," and the socket controller will copy that over to
|
|
/// the next tag.
|
|
///
|
|
/// The tag indicates it is entirely finished with receiving its data by
|
|
/// setting the value of `done` to true. Otherwise it is assumed false.
|
|
///
|
|
/// The link argument is not to be used to control/modify the link from the
|
|
/// tag; it's only a backreference to flash information to the link/peer
|
|
/// through specific callbacks so the peer can learn information.
|
|
///
|
|
ircd::const_buffer
|
|
ircd::server::tag::read_buffer(const const_buffer &buffer,
|
|
bool &done,
|
|
link &link)
|
|
{
|
|
assert(request);
|
|
|
|
return
|
|
head_read < size(request->in.head)?
|
|
read_head(buffer, done, link):
|
|
|
|
read_content(buffer, done);
|
|
}
|
|
|
|
/// An idempotent operation that provides the location of where the socket
|
|
/// should place the next received data. The tag figures this out based on
|
|
/// whether it receiving HTTP head data or whether it is in content mode.
|
|
///
|
|
ircd::mutable_buffer
|
|
ircd::server::tag::make_read_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
|
|
return
|
|
head_read < size(request->in.head)?
|
|
make_read_head_buffer():
|
|
|
|
content_read >= size(request->in.content)?
|
|
make_read_discard_buffer():
|
|
|
|
make_read_content_buffer();
|
|
}
|
|
|
|
void
|
|
ircd::server::tag::wrote_buffer(const const_buffer &buffer)
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
written += size(buffer);
|
|
|
|
if(written <= size(req.out.head))
|
|
{
|
|
assert(data(buffer) >= begin(req.out.head));
|
|
assert(data(buffer) < end(req.out.head));
|
|
}
|
|
else if(written <= size(req.out.head) + size(req.out.content))
|
|
{
|
|
assert(data(buffer) >= begin(req.out.content));
|
|
assert(data(buffer) < end(req.out.content));
|
|
assert(written <= write_total());
|
|
|
|
// Invoke the user's optional progress callback; this function
|
|
// should be marked noexcept and has no reason to throw yet.
|
|
if(req.out.progress)
|
|
req.out.progress(buffer, const_buffer{data(req.out.content), written});
|
|
}
|
|
else
|
|
{
|
|
assert(0);
|
|
}
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::tag::make_write_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
|
|
return
|
|
written < size(req.out.head)?
|
|
make_write_head_buffer():
|
|
|
|
written < size(req.out.head) + size(req.out.content)?
|
|
make_write_content_buffer():
|
|
|
|
const_buffer{};
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::tag::make_write_head_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
|
|
const size_t remain
|
|
{
|
|
size(req.out.head) - written
|
|
};
|
|
|
|
const const_buffer window
|
|
{
|
|
data(req.out.head) + written, remain
|
|
};
|
|
|
|
return window;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::tag::make_write_content_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
assert(written >= size(req.out.head));
|
|
|
|
const size_t content_offset
|
|
{
|
|
written - size(req.out.head)
|
|
};
|
|
|
|
const size_t remain
|
|
{
|
|
size(req.out.head) + size(req.out.content) - written
|
|
};
|
|
|
|
const const_buffer window
|
|
{
|
|
data(req.out.content) + content_offset, remain
|
|
};
|
|
|
|
return window;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::tag::read_head(const const_buffer &buffer,
|
|
bool &done,
|
|
link &link)
|
|
{
|
|
assert(request);
|
|
auto &req{*request};
|
|
|
|
// informal search for head terminator
|
|
static const string_view terminator{"\r\n\r\n"};
|
|
const auto pos
|
|
{
|
|
string_view{data(buffer), size(buffer)}.find(terminator)
|
|
};
|
|
|
|
// No terminator found; account for what was received in this buffer
|
|
// for the next call to make_head_buffer() preparing for the subsequent
|
|
// invocation of this function with more data.
|
|
if(pos == string_view::npos)
|
|
{
|
|
this->head_read += size(buffer);
|
|
|
|
// Check that the user hasn't run out of head buffer space without
|
|
// seeing a terminator. If so, we have to throw out of here and then
|
|
// abort this user's request.
|
|
if(unlikely(this->head_read >= size(req.in.head)))
|
|
throw buffer_overrun
|
|
{
|
|
"Supplied buffer of %zu too small for HTTP head", size(req.in.head)
|
|
};
|
|
|
|
return {};
|
|
}
|
|
|
|
// This indicates how much head was just received from this buffer only,
|
|
// including the terminator which is considered part of the dome.
|
|
const size_t addl_head_bytes
|
|
{
|
|
pos + size(terminator)
|
|
};
|
|
|
|
// The received buffer may go past the end of the head.
|
|
assert(addl_head_bytes <= size(buffer));
|
|
const size_t beyond_head_len
|
|
{
|
|
size(buffer) - addl_head_bytes
|
|
};
|
|
|
|
// The final update for the confirmed length of the head.
|
|
this->head_read += addl_head_bytes;
|
|
const size_t &head_read{this->head_read};
|
|
assert(head_read + beyond_head_len <= size(req.in.head));
|
|
|
|
// Window on any data in the buffer after the head.
|
|
const const_buffer beyond_head
|
|
{
|
|
data(req.in.head) + head_read, beyond_head_len
|
|
};
|
|
|
|
// Before changing the user's head buffer, we branch for a feature that
|
|
// allows the user to receive head and content into a single contiguous
|
|
// buffer by assigning in.content = in.head.
|
|
const bool contiguous
|
|
{
|
|
data(req.in.content) == data(req.in.head)
|
|
};
|
|
|
|
if(contiguous)
|
|
{
|
|
const auto content_max
|
|
{
|
|
std::max(ssize_t(size(req.in.content) - head_read), ssize_t(0))
|
|
};
|
|
|
|
req.in.content = mutable_buffer
|
|
{
|
|
data(req.in.head) + head_read, size_t(content_max)
|
|
};
|
|
}
|
|
|
|
// Resize the user's head buffer tight to the head; this is how we convey
|
|
// the size of the dome back to the user.
|
|
req.in.head = mutable_buffer
|
|
{
|
|
data(req.in.head), head_read
|
|
};
|
|
|
|
// Setup the capstan and mark the end of the tape
|
|
parse::buffer pb{req.in.head};
|
|
parse::capstan pc{pb};
|
|
pc.read += size(req.in.head);
|
|
|
|
// Play the tape through the formal grammar.
|
|
const http::response::head head{pc};
|
|
assert(pb.completed() == head_read);
|
|
this->status = http::status(head.status);
|
|
|
|
// Proffer the HTTP head to the peer so it can learn from any data
|
|
assert(link.peer);
|
|
link.peer->handle_head_recv(link, *this, head);
|
|
|
|
// Now we know how much content was received beyond the head
|
|
const size_t &content_read
|
|
{
|
|
std::min(head.content_length, beyond_head_len)
|
|
};
|
|
|
|
// Now we know how much bleed into the next message was also received
|
|
assert(beyond_head_len >= content_read);
|
|
const size_t beyond_content_len
|
|
{
|
|
beyond_head_len - content_read
|
|
};
|
|
|
|
const const_buffer partial_content
|
|
{
|
|
data(req.in.head) + head_read, content_read
|
|
};
|
|
|
|
// Anything remaining is not our response and must be given back.
|
|
const const_buffer overrun
|
|
{
|
|
data(beyond_head) + size(partial_content), beyond_content_len
|
|
};
|
|
|
|
// We branch for a feature that allows dynamic allocation of the content
|
|
// buffer if the user did not specify any buffer.
|
|
const bool dynamic
|
|
{
|
|
!contiguous && empty(req.in.content)
|
|
};
|
|
|
|
if(dynamic)
|
|
{
|
|
assert(req.opt);
|
|
const size_t alloc_size
|
|
{
|
|
std::min(head.content_length, req.opt->content_length_maxalloc)
|
|
};
|
|
|
|
req.in.dynamic = unique_buffer<mutable_buffer>{alloc_size};
|
|
req.in.content = req.in.dynamic;
|
|
}
|
|
|
|
// Reduce the user's content buffer to the content-length. This is sort of
|
|
// how we convey the content-length back to the user. The buffer size will
|
|
// eventually reflect how much content was actually received; the user can
|
|
// find the given content-length by parsing the header.
|
|
req.in.content = mutable_buffer
|
|
{
|
|
data(req.in.content), std::min(head.content_length, size(req.in.content))
|
|
};
|
|
|
|
// If the supplied content buffer is too small this must indicate how much
|
|
// content will have to be discarded later to not mess up the pipeline.
|
|
if(head.content_length > size(req.in.content))
|
|
content_over = head.content_length - size(req.in.content);
|
|
|
|
// Any partial content was written to the head buffer by accident,
|
|
// that may have to be copied over to the content buffer.
|
|
if(!empty(partial_content) && !contiguous)
|
|
copy(req.in.content, partial_content);
|
|
|
|
// Invoke the read_content() routine which will increment this->content_read
|
|
read_content(partial_content, done);
|
|
assert(this->content_read == size(partial_content));
|
|
|
|
return overrun;
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::server::tag::read_content(const const_buffer &buffer,
|
|
bool &done)
|
|
{
|
|
assert(request);
|
|
auto &req{*request};
|
|
const auto &content{req.in.content};
|
|
|
|
// The amount of remaining content for the response sequence
|
|
assert(size(content) + content_over >= content_read);
|
|
const size_t remaining
|
|
{
|
|
size(content) + content_over - content_read
|
|
};
|
|
|
|
// The amount of content read in this buffer only.
|
|
const size_t addl_content_read
|
|
{
|
|
std::min(size(buffer), remaining)
|
|
};
|
|
|
|
content_read += addl_content_read;
|
|
assert(size(buffer) - addl_content_read == 0);
|
|
assert(content_read <= size(content) + content_over);
|
|
|
|
// Invoke the user's optional progress callback; this function
|
|
// should be marked noexcept for the time being.
|
|
if(req.in.progress)
|
|
req.in.progress(buffer, const_buffer{data(content), content_read});
|
|
|
|
if(content_read == size(content) + content_over)
|
|
{
|
|
done = true;
|
|
set_value(status);
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
ircd::mutable_buffer
|
|
ircd::server::tag::make_read_head_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
const auto &head{req.in.head};
|
|
const auto &content{req.in.content};
|
|
if(head_read >= size(head))
|
|
return {};
|
|
|
|
const size_t remaining
|
|
{
|
|
size(head) - head_read
|
|
};
|
|
|
|
assert(remaining <= size(head));
|
|
const mutable_buffer buffer
|
|
{
|
|
data(head) + head_read, remaining
|
|
};
|
|
|
|
return buffer;
|
|
}
|
|
|
|
ircd::mutable_buffer
|
|
ircd::server::tag::make_read_content_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
const auto &req{*request};
|
|
const auto &content{req.in.content};
|
|
|
|
// The amount of bytes we still have to read to for the response
|
|
assert(size(content) >= content_read);
|
|
const size_t remaining
|
|
{
|
|
size(content) - content_read
|
|
};
|
|
|
|
return
|
|
{
|
|
data(content) + content_read, remaining
|
|
};
|
|
}
|
|
|
|
ircd::mutable_buffer
|
|
ircd::server::tag::make_read_discard_buffer()
|
|
const
|
|
{
|
|
assert(request);
|
|
assert(content_over > 0);
|
|
assert(content_over <= content_read);
|
|
assert(content_read >= size(request->in.content));
|
|
const size_t remaining
|
|
{
|
|
content_over - content_read
|
|
};
|
|
|
|
static char buffer[512];
|
|
const size_t buffer_max
|
|
{
|
|
std::min(remaining, sizeof(buffer))
|
|
};
|
|
|
|
return
|
|
{
|
|
buffer, buffer_max
|
|
};
|
|
}
|
|
|
|
template<class... args>
|
|
void
|
|
ircd::server::tag::set_value(args&&... a)
|
|
{
|
|
if(abandoned())
|
|
return;
|
|
|
|
const http::code &code
|
|
{
|
|
std::forward<args>(a)...
|
|
};
|
|
|
|
assert(request->opt);
|
|
if(request->opt->http_exceptions && code >= http::code(300))
|
|
{
|
|
const string_view content
|
|
{
|
|
data(request->in.content), size(request->in.content)
|
|
};
|
|
|
|
set_exception(http::error{code, std::string{content}});
|
|
return;
|
|
}
|
|
|
|
assert(p.valid());
|
|
p.set_value(code);
|
|
}
|
|
|
|
template<class... args>
|
|
void
|
|
ircd::server::tag::set_exception(args&&... a)
|
|
{
|
|
if(abandoned())
|
|
return;
|
|
|
|
set_exception(std::make_exception_ptr(std::forward<args>(a)...));
|
|
}
|
|
|
|
void
|
|
ircd::server::tag::set_exception(std::exception_ptr eptr)
|
|
{
|
|
if(abandoned())
|
|
return;
|
|
|
|
assert(p.valid());
|
|
p.set_exception(std::move(eptr));
|
|
}
|
|
|
|
bool
|
|
ircd::server::tag::abandoned()
|
|
const
|
|
{
|
|
return !p.valid();
|
|
}
|
|
|
|
bool
|
|
ircd::server::tag::canceled()
|
|
const
|
|
{
|
|
return bool(cancellation);
|
|
}
|
|
|
|
bool
|
|
ircd::server::tag::committed()
|
|
const
|
|
{
|
|
return write_completed() > 0;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::read_remaining()
|
|
const
|
|
{
|
|
return read_total() - read_completed();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::read_completed()
|
|
const
|
|
{
|
|
return head_read + content_read;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::read_total()
|
|
const
|
|
{
|
|
return request? size(request->in) : 0;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::write_remaining()
|
|
const
|
|
{
|
|
return write_total() - write_completed();
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::write_completed()
|
|
const
|
|
{
|
|
return written;
|
|
}
|
|
|
|
size_t
|
|
ircd::server::tag::write_total()
|
|
const
|
|
{
|
|
return request? size(request->out) : 0;
|
|
}
|