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Add a plugin for prometheus (drogonframework#1632)
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * @file PromExporter.h | ||
| * @author An Tao | ||
| * | ||
| * Copyright 2018, An Tao. All rights reserved. | ||
| * https://github.com/an-tao/drogon | ||
| * Use of this source code is governed by a MIT license | ||
| * that can be found in the License file. | ||
| * | ||
| * Drogon | ||
| * | ||
| */ | ||
|
|
||
| #pragma once | ||
| #include <drogon/plugins/Plugin.h> | ||
| #include <drogon/utils/monitoring/Registry.h> | ||
| #include <drogon/utils/monitoring/Collector.h> | ||
| #include <memory> | ||
| #include <mutex> | ||
|
|
||
| namespace drogon | ||
| { | ||
| namespace plugin | ||
| { | ||
| /** | ||
| * @brief The PromExporter plugin implements a prometheus exporter. | ||
| * The json configuration is as follows: | ||
| * @code | ||
| { | ||
| "name": "drogon::plugin::PromExporter", | ||
| "dependencies": [], | ||
| "config": { | ||
| // The path of the metrics. the default value is "/metrics". | ||
| "path": "/metrics", | ||
| // The list of collectors. | ||
| "collectors":[ | ||
| { | ||
| // The name of the collector. | ||
| "name": "http_requests_total", | ||
| // The help message of the collector. | ||
| "help": "The total number of http requests", | ||
| // The type of the collector. The default value is "counter". | ||
| // The other possible value is as following: | ||
| // "gauge", "histogram". | ||
| "type": "counter", | ||
| // The labels of the collector. | ||
| "labels": ["method", "status"] | ||
| } | ||
| ] | ||
| } | ||
| } | ||
| @endcode | ||
| * */ | ||
| class DROGON_EXPORT PromExporter | ||
| : public drogon::Plugin<PromExporter>, | ||
| public std::enable_shared_from_this<PromExporter>, | ||
| public drogon::monitoring::Registry | ||
| { | ||
| public: | ||
| PromExporter() | ||
| { | ||
| } | ||
|
|
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| void initAndStart(const Json::Value &config) override; | ||
|
|
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| void shutdown() override | ||
| { | ||
| } | ||
|
|
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| ~PromExporter() override | ||
| { | ||
| } | ||
|
|
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| void registerCollector( | ||
| const std::shared_ptr<drogon::monitoring::CollectorBase> &collector) | ||
| override; | ||
|
|
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| std::shared_ptr<drogon::monitoring::CollectorBase> getCollector( | ||
| const std::string &name) const noexcept(false); | ||
|
|
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| template <typename T> | ||
| std::shared_ptr<drogon::monitoring::Collector<T>> getCollector( | ||
| const std::string &name) const | ||
| { | ||
| return std::dynamic_pointer_cast<drogon::monitoring::Collector<T>>( | ||
| getCollector(name)); | ||
| } | ||
|
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| private: | ||
| mutable std::mutex mutex_; | ||
| std::unordered_map<std::string, | ||
| std::shared_ptr<drogon::monitoring::CollectorBase>> | ||
| collectors_; | ||
| std::string path_{"/metrics"}; | ||
| std::string exportMetrics(); | ||
| }; | ||
| } // namespace plugin | ||
| } // namespace drogon |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| /** | ||
| * | ||
| * monitoring.h | ||
| * An Tao | ||
| * | ||
| * Copyright 2018, An Tao. All rights reserved. | ||
| * https://github.com/an-tao/drogon | ||
| * Use of this source code is governed by a MIT license | ||
| * that can be found in the License file. | ||
| * | ||
| * Drogon | ||
| * | ||
| */ | ||
| #pragma once | ||
| #include <drogon/utils/monitoring/Metric.h> | ||
| #include <drogon/utils/monitoring/Registry.h> | ||
| #include <drogon/utils/monitoring/Collector.h> | ||
| #include <drogon/utils/monitoring/Sample.h> |
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