mirror of
https://github.com/matrix-construct/construct
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239 lines
5.3 KiB
C++
239 lines
5.3 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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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#pragma once
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#define HAVE_IRCD_STATS_H
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/// Statistics & Metrics
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///
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/// This is a central collection of registered items each representing a
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/// counter or metric of some kind. To collect items of various types we orient
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/// the collection around an abstract item<void> template class. To keep things
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/// simple, the abstract instance holds a typeinfo provided by the derived
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/// instance. User can then downcast the item<void> to a derived template.
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///
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/// There are two levels in the class hierarchy under the abstract root
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/// item<void>. The next level is a pointer-to-value such that the item
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/// registers the location of an existing value. This is useful for
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/// incorporating external values in existing structures into this collection
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/// non-intrusively; for example in third-party libraries etc.
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///
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/// The next derived level after this is where the item instance itself
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/// roots (contains) the value and its parent class at the pointer-level points
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/// down to the derived class. This is a convenience for developers so that
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/// extern values don't have to be created separately for every stats item.
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/// Note that when this subsystem works abstractly with items, it considers the
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/// pointer-level templates to be the principal level of derivation; in other
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/// words there is no reason to downcast to a value-level template when working
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/// with this system, and every value-level template must have a matching
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/// pointer-level parent.
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namespace ircd::stats
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{
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, not_found)
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// Abstract item
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template<class T = void> struct item;
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template<> struct item<void>;
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// Pointer-to-value items
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template<> struct item<uint64_t *>;
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template<> struct item<uint32_t *>;
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template<> struct item<uint16_t *>;
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// Value-carrying items
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template<> struct item<uint64_t>;
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template<> struct item<uint32_t>;
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template<> struct item<uint16_t>;
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extern const size_t NAME_MAX_LEN;
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extern std::map<string_view, item<void> *> items;
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string_view string(const mutable_buffer &, const item<void> &);
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std::ostream &operator<<(std::ostream &, const item<void> &);
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}
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/// Abstract stats item.
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///
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/// This object contains type information about its derived class. There is no
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/// known use for constructing this on its own without a derived item.
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///
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/// Feature information must contain a 'name' string. It is advised that this
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/// is appropriately namespaced i.e "ircd.net.socket.xxx" and when third-party
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/// values are gathered i.e "rocksdb.xxx." such that the entire map of items
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/// can be serialized into a single JSON object tree.
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///
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/// Feature information can also contain a 'desc' string describing more about
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/// the value to administrators and developers.
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template<>
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struct ircd::stats::item<void>
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{
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std::type_index type {typeid(void)};
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json::strung feature;
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public:
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// Access features
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string_view operator[](const string_view &key) const noexcept;
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virtual bool operator!() const = 0;
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item() = default;
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item(const std::type_index &, const json::members &);
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item(item &&) = delete;
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item(const item &) = delete;
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virtual ~item() noexcept;
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};
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template<>
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struct ircd::stats::item<uint64_t *>
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:item<void>
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{
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uint64_t *val {nullptr};
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public:
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bool operator!() const override
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{
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return !val || !*val;
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}
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operator const uint64_t &() const
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{
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assert(val);
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return *val;
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}
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operator uint64_t &()
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{
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assert(val);
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return *val;
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}
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item(uint64_t *const &, const json::members &);
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item() = default;
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};
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template<>
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struct ircd::stats::item<uint32_t *>
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:item<void>
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{
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uint32_t *val {nullptr};
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public:
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bool operator!() const override
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{
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return !val || !*val;
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}
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operator const uint32_t &() const
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{
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assert(val);
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return *val;
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}
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operator uint32_t &()
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{
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assert(val);
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return *val;
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}
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item(uint32_t *const &, const json::members &);
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item() = default;
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};
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template<>
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struct ircd::stats::item<uint16_t *>
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:item<void>
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{
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uint16_t *val {nullptr};
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public:
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bool operator!() const override
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{
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return !val || !*val;
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}
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operator const uint16_t &() const
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{
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assert(val);
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return *val;
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}
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operator uint16_t &()
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{
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assert(val);
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return *val;
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}
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item(uint16_t *const &, const json::members &);
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item() = default;
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};
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template<>
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struct ircd::stats::item<uint64_t>
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:item<uint64_t *>
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{
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uint64_t val {0};
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public:
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operator const uint64_t &() const noexcept
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{
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return val;
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}
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operator uint64_t &() noexcept
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{
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return val;
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}
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item(const json::members &);
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item() = default;
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};
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template<>
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struct ircd::stats::item<uint32_t>
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:item<uint32_t *>
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{
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uint32_t val {0};
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public:
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operator const uint32_t &() const noexcept
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{
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return val;
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}
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operator uint32_t &() noexcept
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{
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return val;
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}
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item(const json::members &);
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item() = default;
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};
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template<>
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struct ircd::stats::item<uint16_t>
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:item<uint16_t *>
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{
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uint16_t val {0};
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public:
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operator const uint16_t &() const noexcept
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{
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return val;
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}
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operator uint16_t &() noexcept
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{
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return val;
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}
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item(const json::members &);
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item() = default;
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};
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