mirror of
https://github.com/matrix-construct/construct
synced 2024-08-31 05:45:16 +02:00
393 lines
6.1 KiB
C++
393 lines
6.1 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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decltype(ircd::conf::items)
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ircd::conf::items
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{};
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decltype(ircd::conf::on_init)
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ircd::conf::on_init
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{};
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size_t
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ircd::conf::reset()
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{
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size_t ret{0};
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for(const auto &p : items)
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ret += reset(p.first);
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return ret;
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}
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bool
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ircd::conf::reset(const string_view &key)
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try
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{
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return reset(std::nothrow, key);
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}
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catch(const std::exception &e)
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{
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return false;
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}
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bool
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ircd::conf::reset(std::nothrow_t,
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const string_view &key)
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try
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{
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auto &item(*items.at(key));
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if(!item.set_cb)
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return false;
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item.set_cb();
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return true;
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}
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catch(const std::out_of_range &e)
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{
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throw not_found
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{
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"Conf item '%s' is not available", key
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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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log::error
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{
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"conf item[%s] set callback :%s",
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key,
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e.what()
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};
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throw;
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}
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bool
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ircd::conf::set(std::nothrow_t,
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const string_view &key,
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const string_view &value)
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try
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{
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return set(key, value);
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}
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catch(const std::exception &e)
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{
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log::error
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{
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"%s", e.what()
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};
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return false;
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}
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bool
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ircd::conf::set(const string_view &key,
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const string_view &value)
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try
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{
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auto &item(*items.at(key));
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return item.set(value);
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}
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catch(const bad_lex_cast &e)
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{
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throw bad_value
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{
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"Conf item '%s' rejected value '%s'", key, value
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};
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}
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catch(const std::out_of_range &e)
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{
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throw not_found
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{
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"Conf item '%s' is not available", key
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};
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}
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ircd::string_view
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ircd::conf::get(const string_view &key,
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const mutable_buffer &out)
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try
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{
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const auto &item(*items.at(key));
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return item.get(out);
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}
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catch(const std::out_of_range &e)
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{
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throw not_found
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{
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"Conf item '%s' is not available", key
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};
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}
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bool
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ircd::conf::persists(const string_view &key)
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try
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{
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const auto &item(*items.at(key));
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return item.feature.get("persist", true);
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}
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catch(const std::out_of_range &e)
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{
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throw not_found
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{
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"Conf item '%s' is not available", key
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};
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}
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bool
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ircd::conf::exists(const string_view &key)
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{
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return items.count(key);
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}
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//
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// item
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//
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decltype(ircd::conf::item<void>::NAME_MAX_LEN)
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ircd::conf::item<void>::NAME_MAX_LEN
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{
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127
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};
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/// Conf item abstract constructor.
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ircd::conf::item<void>::item(const json::members &opts,
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conf::set_cb set_cb)
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:feature_
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{
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opts
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}
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,feature
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{
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feature_
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}
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,name
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{
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unquote(feature.at("name"))
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}
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,set_cb
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{
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std::move(set_cb)
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}
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{
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if(size(name) > NAME_MAX_LEN)
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throw error
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{
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"Conf item '%s' name length:%zu exceeds max:%zu",
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name,
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size(name),
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NAME_MAX_LEN
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};
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if(!items.emplace(name, this).second)
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throw error
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{
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"Conf item named '%s' already exists", name
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};
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}
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ircd::conf::item<void>::~item()
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noexcept
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{
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if(name)
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{
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const auto it{items.find(name)};
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assert(data(it->first) == data(name));
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items.erase(it);
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}
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}
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bool
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ircd::conf::item<void>::set(const string_view &val)
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{
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const bool ret
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{
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on_set(val)
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};
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if(set_cb) try
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{
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set_cb();
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}
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catch(const std::exception &e)
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{
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log::error
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{
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"conf item[%s] set callback :%s", e.what()
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};
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}
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return ret;
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}
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ircd::string_view
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ircd::conf::item<void>::get(const mutable_buffer &buf)
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const
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{
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return on_get(buf);
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}
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bool
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ircd::conf::item<void>::on_set(const string_view &)
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{
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return false;
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}
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ircd::string_view
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ircd::conf::item<void>::on_get(const mutable_buffer &)
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const
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{
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return {};
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}
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namespace ircd::conf
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{
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static void call_env(item<void> &) noexcept;
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static void call_init(item<void> &) noexcept;
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}
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void
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ircd::conf::item<void>::call_init()
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{
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// The conf item's default value specified by the constructor is its
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// current value at this point; now we make callbacks to allow that value
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// to be replaced with a better one (i.e reading a saved value from DB).
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conf::call_init(*this);
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// Environmental variables now get the final say; this allows any
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// misconfiguration to be overridden by env vars. The variable name is
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// the conf item name with any '.' replaced to '_', case is preserved.
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conf::call_env(*this);
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}
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void
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ircd::conf::call_init(item<void> &item)
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noexcept try
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{
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on_init(item);
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}
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catch(const std::exception &e)
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{
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log::error
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{
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"conf item[%s] on_init callback :%s",
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item.name,
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e.what()
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};
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}
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void
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ircd::conf::call_env(item<void> &item)
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noexcept try
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{
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assert(size(item.name) <= item.NAME_MAX_LEN);
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thread_local char key[item.NAME_MAX_LEN];
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const string_view name
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{
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key,
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std::replace_copy(begin(item.name), end(item.name), key, '.', '_')
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};
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const string_view val
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{
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util::getenv(name)
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};
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if(!empty(val))
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item.set(val);
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}
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catch(const std::exception &e)
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{
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log::error
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{
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"conf item[%s] environmental variable :%s",
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item.name,
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e.what()
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};
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}
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//
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// Non-inline template specialization definitions
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//
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//
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// std::string
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//
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ircd::conf::item<std::string>::item(const json::members &members,
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conf::set_cb set_cb)
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:conf::item<>
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{
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members, std::move(set_cb)
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}
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,value
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{
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unquote(feature.get("default"))
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}
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{
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call_init();
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}
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bool
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ircd::conf::item<std::string>::on_set(const string_view &s)
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{
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_value = std::string{s};
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return true;
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}
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ircd::string_view
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ircd::conf::item<std::string>::on_get(const mutable_buffer &out)
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const
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{
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return { data(out), _value.copy(data(out), size(out)) };
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}
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//
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// bool
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//
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ircd::conf::item<bool>::item(const json::members &members,
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conf::set_cb set_cb)
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:conf::item<>
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{
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members, std::move(set_cb)
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}
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,value
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{
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feature.get<bool>("default", false)
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}
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{
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call_init();
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}
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bool
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ircd::conf::item<bool>::on_set(const string_view &s)
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try
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{
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_value = lex_cast<bool>(s);
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return true;
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}
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catch(const bad_lex_cast &e)
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{
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throw bad_value
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{
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"Conf item '%s' not assigned a bool literal :%s",
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name,
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e.what()
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};
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}
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ircd::string_view
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ircd::conf::item<bool>::on_get(const mutable_buffer &out)
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const
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{
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return _value?
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strlcpy(out, "true"_sv):
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strlcpy(out, "false"_sv);
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}
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