TracingUtils.h

 
#pragma once
 
#include <aws/core/monitoring/HttpClientMetrics.h>
#include <aws/core/utils/logging/LogMacros.h>
#include <smithy/Smithy_EXPORTS.h>
#include <smithy/tracing/Meter.h>
#include <functional>
#include <chrono>
#include <utility>
 
namespace smithy {
    namespace components {
        namespace tracing {
            class SMITHY_API TracingUtils {
            public:
                TracingUtils() = default;
 
                static const char COUNT_METRIC_TYPE[];
                static const char MICROSECOND_METRIC_TYPE[];
                static const char BYTES_PER_SECOND_METRIC_TYPE[];
                static const char SMITHY_CLIENT_DURATION_METRIC[];
                static const char SMITHY_CLIENT_ENDPOINT_RESOLUTION_METRIC[];
                static const char SMITHY_CLIENT_DESERIALIZATION_METRIC[];
                static const char SMITHY_CLIENT_SIGNING_METRIC[];
                static const char SMITHY_CLIENT_SERIALIZATION_METRIC[];
                static const char SMITHY_CLIENT_SERVICE_CALL_METRIC[];
                static const char SMITHY_CLIENT_SERVICE_BACKOFF_DELAY_METRIC[];
                static const char SMITHY_CLIENT_SERVICE_ATTEMPTS_METRIC[];
                static const char SMITHY_METHOD_AWS_VALUE[];
                static const char SMITHY_SERVICE_DIMENSION[];
                static const char SMITHY_METHOD_DIMENSION[];
                static const char SMITHY_SYSTEM_DIMENSION[];
                static const char SMITHY_METRICS_DNS_DURATION[];
                static const char SMITHY_METRICS_CONNECT_DURATION[];
                static const char SMITHY_METRICS_SSL_DURATION[];
                static const char SMITHY_METRICS_DOWNLOAD_SPEED_METRIC[];
                static const char SMITHY_METRICS_UPLOAD_SPEED_METRIC[];
                static const char SMITHY_METRICS_UNKNOWN_METRIC[];
 
                template<typename T>
                static T MakeCallWithTiming(std::function<T()> func,
                    const Aws::String &metricName,
                    const Meter &meter,
                    Aws::Map<Aws::String, Aws::String>&& attributes,
                    const Aws::String &description = "")
                {
                    auto before = std::chrono::steady_clock::now();
                    auto returnValue = func();
                    auto after = std::chrono::steady_clock::now();
                    auto duration = std::chrono::duration_cast<std::chrono::microseconds>(after - before).count();
                    auto histogram = meter.CreateHistogram(metricName, MICROSECOND_METRIC_TYPE, description);
                    if (!histogram) {
                        AWS_LOG_ERROR("TracingUtil", "Failed to create histogram");
                        return {};
                    }
                    histogram->record((double) duration, std::forward<Aws::Map<Aws::String, Aws::String>>(attributes));
                    return returnValue;
                }
 
                static void MakeCallWithTiming(std::function<void(void)> func,
                    Aws::String metricName,
                    const Meter &meter,
                    Aws::Map<Aws::String, Aws::String>&& attributes,
                    Aws::String description = "")
                {
                    auto before = std::chrono::steady_clock::now();
                    func();
                    auto after = std::chrono::steady_clock::now();
                    auto duration = std::chrono::duration_cast<std::chrono::microseconds>(after - before).count();
                    auto histogram = meter.CreateHistogram(std::move(metricName), MICROSECOND_METRIC_TYPE, std::move(description));
                    if (!histogram) {
                        AWS_LOG_ERROR("TracingUtil", "Failed to create histogram");
                        return;
                    }
                    histogram->record((double) duration, std::forward<Aws::Map<Aws::String, Aws::String>>(attributes));
                }
 
                static void EmitCoreHttpMetrics(const Aws::Monitoring::HttpClientMetricsCollection &metrics,
                    const Meter &meter,
                    Aws::Map<Aws::String, Aws::String>&& attributes,
                    Aws::String description = "")
                {
                    for (auto const &entry: metrics) {
                        auto smithyMetric = ConvertCoreMetricToSmithy(entry.first);
                        if (smithyMetric.first != SMITHY_METRICS_UNKNOWN_METRIC) {
                            auto histogram = meter.CreateHistogram(std::move(smithyMetric.first),
                                smithyMetric.second,
                                std::move(description));
                            if (!histogram) {
                                AWS_LOG_ERROR("TracingUtil", "Failed to create histogram");
                            }
                            histogram->record((double) entry.second, attributes);
                        }
                    }
                }
 
                static std::pair<Aws::String, Aws::String> ConvertCoreMetricToSmithy(const Aws::String &name) {
                    //TODO: Make static map, Aws::Map cannot be made static with a customer memory manager as of the moment.
                    Aws::Map<int, std::pair<Aws::String, Aws::String>> metricsTypeToName =
                        {
                            std::pair<int, std::pair<Aws::String, Aws::String>>(
                                static_cast<int>(Aws::Monitoring::HttpClientMetricsType::DnsLatency),
                                std::make_pair(SMITHY_METRICS_DNS_DURATION, MICROSECOND_METRIC_TYPE)),
                            std::pair<int, std::pair<Aws::String, Aws::String>>(
                                static_cast<int>(Aws::Monitoring::HttpClientMetricsType::ConnectLatency),
                                std::make_pair(SMITHY_METRICS_CONNECT_DURATION, MICROSECOND_METRIC_TYPE)),
                            std::pair<int, std::pair<Aws::String, Aws::String>>(
                                static_cast<int>(Aws::Monitoring::HttpClientMetricsType::SslLatency),
                                std::make_pair(SMITHY_METRICS_SSL_DURATION, MICROSECOND_METRIC_TYPE)),
                            std::pair<int, std::pair<Aws::String, Aws::String>>(
                                static_cast<int>(Aws::Monitoring::HttpClientMetricsType::DownloadSpeed),
                                std::make_pair(SMITHY_METRICS_DOWNLOAD_SPEED_METRIC, BYTES_PER_SECOND_METRIC_TYPE)),
                            std::pair<int, std::pair<Aws::String, Aws::String>>(
                                static_cast<int>(Aws::Monitoring::HttpClientMetricsType::UploadSpeed),
                                std::make_pair(SMITHY_METRICS_UPLOAD_SPEED_METRIC, BYTES_PER_SECOND_METRIC_TYPE)),
                        };
 
                    auto metricType = Aws::Monitoring::GetHttpClientMetricTypeByName(name);
                    auto it = metricsTypeToName.find(static_cast<int>(metricType));
                    if (it == metricsTypeToName.end()) {
                        return std::make_pair(SMITHY_METRICS_UNKNOWN_METRIC, "unknown");
                    }
                    return it->second;
                }
            };
        }
    }
}