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/** |
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* This file is part of the CernVM File System. |
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* |
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* TelemetryAggregator class manages a thread that snapshots the internal |
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* counters of cvmfs statistic object. A custom telemetry class is needed to |
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* perform the step of manipulating and sending/storing the counters. |
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*/ |
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#ifndef CVMFS_TELEMETRY_AGGREGATOR_H_ |
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#define CVMFS_TELEMETRY_AGGREGATOR_H_ |
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#include <pthread.h> |
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#include <stdint.h> |
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#include <cstring> |
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#include <map> |
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#include <string> |
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#include <vector> |
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#include "gtest/gtest_prod.h" |
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#include "mountpoint.h" |
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#include "options.h" |
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#include "statistics.h" |
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#include "util/single_copy.h" |
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class MountPoint; |
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namespace perf { |
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// Return values of telemetry classes (including custom classes) |
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enum TelemetryReturn { |
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kTelemetrySuccess = 0, |
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kTelemetryFailHostAddress, |
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kTelemetryFailPort, |
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kTelemetryFailSocket, |
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kTelemetryFailSend |
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}; |
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// List of available custom telemetry classes |
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enum TelemetrySelector { |
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kTelemetryInflux |
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}; |
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class TelemetryAggregator : SingleCopy { |
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FRIEND_TEST(T_TelemetryAggregator, EmptyCounters); |
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FRIEND_TEST(T_TelemetryAggregator, FailCreate); |
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FRIEND_TEST(T_TelemetryAggregator, ExtraFields_Tags); |
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FRIEND_TEST(T_TelemetryAggregator, UpdateCounters_WithExtraFields_Tags); |
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public: |
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/** |
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* Creates the requested telemetry aggregator. This function is also used to |
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* register new classes to aggregate telemetry. |
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* |
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* Returns the newly created TelemetryAggregator or NULL if the creation |
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* was not successful. |
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*/ |
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static TelemetryAggregator* Create(Statistics* statistics, |
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int send_rate, |
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OptionsManager *options_mgr, |
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MountPoint* mount_point, |
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const std::string &fqrn, |
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const TelemetrySelector type); |
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virtual ~TelemetryAggregator(); |
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/** |
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* Spawns the telemetry thread. |
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*/ |
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void Spawn(); |
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protected: |
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Statistics* statistics_; |
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const int send_rate_sec_; |
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MountPoint* mount_point_; |
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int pipe_terminate_[2]; |
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pthread_t thread_telemetry_; |
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std::string fqrn_; |
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// State of constructed object. Used in custom telemetry classes to |
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// specify that the object was correctly constructed. |
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bool is_zombie_; |
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uint64_t timestamp_; |
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std::map<std::string, int64_t> counters_; |
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/** |
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* Main loop executed by the telemetry thread. |
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* Checks every x seconds if the telemetry thread should continue running. |
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* If yes, takes a snapshot of all statistic counters that are not 0 and |
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* calls PushMetrics() |
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* |
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* PushMetrics() is defined by the custom telemetry classes and performs all |
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* operation on the statistic counters to send/store them. |
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* |
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*/ |
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static void *MainTelemetry(void *data); |
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/** |
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* Base constructor taking care of threading infrastructure. |
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* Must always be called in the constructor of the custom telemetry classes. |
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*/ |
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TelemetryAggregator(Statistics* statistics, int send_rate_sec, |
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MountPoint* mount_point, const std::string &fqrn) : |
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statistics_(statistics), |
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send_rate_sec_(send_rate_sec), |
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mount_point_(mount_point), |
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fqrn_(fqrn), |
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is_zombie_(true), |
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timestamp_(0) { |
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pipe_terminate_[0] = pipe_terminate_[1] = -1; |
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memset(&thread_telemetry_, 0, sizeof(thread_telemetry_)); |
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} |
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/** |
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* PushMetrics is called after the snapshot of the counters. |
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* It should perform all manipulations needed for the counters and the |
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* sending/storing of the counters. |
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* |
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* Needs to be implemented in the custom telemetry class. |
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*/ |
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virtual void PushMetrics() = 0; |
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private: |
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/** |
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* Some counters must be manually set to get the current value. |
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* Copied from talk.cc:MainResponder() |
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*/ |
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void ManuallyUpdateSelectedCounters(); |
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}; |
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} // namespace perf |
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#endif // CVMFS_TELEMETRY_AGGREGATOR_H_ |
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