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construct/matrix/feds.cc

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// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
namespace ircd::m::feds
{
struct request_base;
template<class T> struct request;
using request_list = std::list<std::unique_ptr<request_base>>;
template<class T> using create_closure = std::function<T (request<T> &, const string_view &origin)>;
template<class T> static request_list for_one(const string_view &origin, const opts &, const closure &, const create_closure<T> &);
template<class T> static request_list for_each_in_room(const opts &, const closure &, const create_closure<T> &);
static bool call_user(const closure &closure, const result &result);
static bool handler(request_list &, const milliseconds &, const closure &);
static request_list head(const opts &, const closure &);
static request_list auth(const opts &, const closure &);
static request_list event(const opts &, const closure &);
static request_list state(const opts &, const closure &);
static request_list backfill(const opts &, const closure &);
static request_list version(const opts &, const closure &);
static request_list keys(const opts &, const closure &);
static request_list send(const opts &, const closure &);
}
//
// request_base
//
/// Polymorphic non-template base
struct ircd::m::feds::request_base
{
const feds::opts *opts {nullptr};
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char origin[event::ORIGIN_MAX_SIZE];
request_base(const feds::opts &opts)
:opts{&opts}
{}
request_base() = default;
virtual ~request_base() noexcept;
};
ircd::m::feds::request_base::~request_base()
noexcept
{
}
//
// request
//
template<class T>
struct ircd::m::feds::request
:request_base
,T
{
char buf[8_KiB];
request(const feds::opts &opts, const std::function<T (request &)> &closure)
:request_base{opts}
,T(closure(*this))
{}
request(request &&) = delete;
request(const request &) = delete;
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~request() noexcept;
};
template<class T>
ircd::m::feds::request<T>::~request()
noexcept
{
if(this->valid())
{
server::cancel(*this);
this->wait();
}
}
///////////////////////////////////////////////////////////////////////////////
//
// m/feds.h
//
ircd::m::feds::execute::execute(const vector_view<const opts> &optsv,
const closure &closure)
:boolean{true}
{
request_list list;
for(const auto &opts : optsv) switch(opts.op)
{
case op::head:
list.splice(list.end(), head(opts, closure));
continue;
case op::auth:
list.splice(list.end(), auth(opts, closure));
continue;
case op::event:
list.splice(list.end(), event(opts, closure));
continue;
case op::state:
list.splice(list.end(), state(opts, closure));
continue;
case op::backfill:
list.splice(list.end(), backfill(opts, closure));
continue;
case op::version:
list.splice(list.end(), version(opts, closure));
continue;
case op::keys:
list.splice(list.end(), keys(opts, closure));
continue;
case op::send:
list.splice(list.end(), send(opts, closure));
continue;
case op::noop:
continue;
}
milliseconds timeout {0};
for(const auto &opts : optsv)
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timeout = std::max(opts.timeout, timeout);
this->boolean::val = handler(list, timeout, closure);
}
ircd::m::feds::request_list
ircd::m::feds::send(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::send::opts v1opts;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::send
{
opts.arg[0], opts.arg[1], request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::send>(opts, closure, make_request);
}
ircd::m::feds::request_list
ircd::m::feds::keys(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::key::query::opts v1opts;
v1opts.dynamic = false;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
const m::fed::key::server_key server_key
{
opts.arg[0], opts.arg[1]
};
return m::fed::key::query
{
{&server_key, 1}, request.buf, std::move(v1opts)
};
}};
return opts.room_id?
for_each_in_room<m::fed::key::query>(opts, closure, make_request):
for_one<m::fed::key::query>(opts.arg[0], opts, closure, make_request);
}
ircd::m::feds::request_list
ircd::m::feds::version(const opts &opts,
const closure &closure)
{
static const auto make_request{[]
(auto &request, const auto &origin)
{
m::fed::version::opts opts;
opts.dynamic = false;
opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::version
{
request.buf, std::move(opts)
};
}};
return for_each_in_room<m::fed::version>(opts, closure, make_request);
}
ircd::m::feds::request_list
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ircd::m::feds::backfill(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::backfill::opts v1opts;
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v1opts.event_id = opts.event_id;
v1opts.limit = opts.argi[0];
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
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};
return m::fed::backfill
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{
opts.room_id, request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::backfill>(opts, closure, make_request);
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}
ircd::m::feds::request_list
ircd::m::feds::state(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::state::opts v1opts;
v1opts.ids_only = opts.arg[0] == "ids";
v1opts.event_id = opts.event_id;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::state
{
opts.room_id, request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::state>(opts, closure, make_request);
}
ircd::m::feds::request_list
ircd::m::feds::event(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::event::opts v1opts;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::event
{
opts.event_id, request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::event>(opts, closure, make_request);
}
ircd::m::feds::request_list
ircd::m::feds::auth(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::event_auth::opts v1opts;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::event_auth
{
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opts.room_id, opts.event_id, request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::event_auth>(opts, closure, make_request);
}
ircd::m::feds::request_list
ircd::m::feds::head(const opts &opts,
const closure &closure)
{
const auto make_request{[&opts]
(auto &request, const auto &origin)
{
m::fed::make_join::opts v1opts;
v1opts.remote = string_view
{
strlcpy{request.origin, origin}
};
return m::fed::make_join
{
opts.room_id, opts.user_id, request.buf, std::move(v1opts)
};
}};
return for_each_in_room<m::fed::make_join>(opts, closure, make_request);
}
///////////////////////////////////////////////////////////////////////////////
//
// (internal)
//
bool
ircd::m::feds::handler(request_list &reqs,
const milliseconds &timeout,
const closure &closure)
{
const auto when
{
now<system_point>() + timeout
};
while(!reqs.empty())
{
static const auto dereferencer{[]
(auto &iterator) -> server::request &
{
return dynamic_cast<server::request &>(**iterator);
}};
auto next
{
ctx::when_any(begin(reqs), end(reqs), dereferencer)
};
if(!next.wait_until(when, std::nothrow))
break;
const auto it
{
next.get()
};
assert(it != end(reqs));
const unwind remove{[&reqs, &it]
{
reqs.erase(it);
}};
request_base &req(**it);
server::request &sreq(dynamic_cast<server::request &>(req)); try
{
const auto code{sreq.get()};
const json::array &array{sreq.in.content};
const json::object &object{sreq.in.content};
const result result
{
req.opts, req.origin, {}, object, array
};
if(!call_user(closure, result))
return false;
}
catch(const std::exception &)
{
if(!req.opts->closure_errors && !req.opts->nothrow_closure_retval)
return false;
if(!req.opts->closure_errors)
continue;
const ctx::exception_handler eptr;
const std::exception_ptr &eptr_(eptr);
const result result
{
req.opts, req.origin, eptr_
};
if(!call_user(closure, result))
return false;
}
}
return true;
}
bool
ircd::m::feds::call_user(const closure &closure,
const result &result)
try
{
return closure(result);
}
catch(const std::exception &)
{
assert(result.request);
if(result.request->nothrow_closure)
return result.request->nothrow_closure_retval;
throw;
}
template<class T>
ircd::m::feds::request_list
ircd::m::feds::for_each_in_room(const opts &opts,
const feds::closure &closure,
const std::function<T (request<T> &, const string_view &origin)> &create_closure)
{
request_list ret;
if(!opts.room_id)
return ret;
const m::room::origins origins
{
opts.room_id
};
// Prelink loop
if(opts.prelink)
origins.for_each([&opts]
(const string_view &origin)
{
if(opts.exclude_myself && my_host(origin))
return;
fed::prelink(origin);
});
// Request loop
origins.for_each([&opts, &ret, &closure, &create_closure]
(const string_view &origin)
{
if(opts.exclude_myself && my_host(origin))
return;
const auto errant
{
fed::errant(origin)
};
if(opts.closure_cached_errors || !errant) try
{
ret.emplace_back(std::make_unique<request<T>>(opts, [&create_closure, &origin]
(auto &request)
{
return create_closure(request, origin);
}));
}
catch(const std::exception &)
{
if(!opts.closure_cached_errors)
return;
feds::result result;
result.request = &opts;
result.origin = origin;
result.eptr = std::current_exception();
const ctx::exception_handler eh;
m::feds::call_user(closure, result);
}
});
return ret;
}
template<class T>
ircd::m::feds::request_list
ircd::m::feds::for_one(const string_view &origin,
const opts &opts,
const feds::closure &closure,
const std::function<T (request<T> &, const string_view &origin)> &create_closure)
{
request_list ret;
if(opts.exclude_myself && my_host(origin))
return ret;
const auto errant
{
fed::errant(origin)
};
if(opts.closure_cached_errors || !errant) try
{
ret.emplace_back(std::make_unique<request<T>>(opts, [&create_closure, &origin]
(auto &request)
{
return create_closure(request, origin);
}));
}
catch(const std::exception &e)
{
if(!opts.closure_cached_errors)
return ret;
feds::result result;
result.request = &opts;
result.origin = origin;
result.eptr = std::current_exception();
const ctx::exception_handler eh;
m::feds::call_user(closure, result);
}
return ret;
}