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[Metrics] Add OTLP http metric exporter (open-telemetry#1487)
* Add OTLP http metric exporter Signed-off-by: owentou <owentou@tencent.com> * Add changelog for OTLP HTTP metric exporter Signed-off-by: owentou <owentou@tencent.com> * Add unit test of `SumPointData` for `OtlpHttpMetricExporter` Signed-off-by: owentou <owentou@tencent.com> * Fix dependency of otlp recordable, add `Gauge` support for `OtlpMetricUtils::PopulateRequest` Signed-off-by: owentou <owentou@tencent.com> * Add unit test for `OtlpHttpMetricExporter` Signed-off-by: owentou <owentou@tencent.com> * Fix format Signed-off-by: owentou <owentou@tencent.com> * Fix unit test `OtlpMetricSerializationTest.ObservableGauge` Signed-off-by: owentou <owentou@tencent.com>
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113
exporters/otlp/include/opentelemetry/exporters/otlp/otlp_http_metric_exporter.h
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| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| #pragma once | ||
| #ifndef ENABLE_METRICS_PREVIEW | ||
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| # include "opentelemetry/sdk/metrics/metric_exporter.h" | ||
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| # include "opentelemetry/exporters/otlp/otlp_http_client.h" | ||
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| # include "opentelemetry/exporters/otlp/otlp_environment.h" | ||
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| # include <chrono> | ||
| # include <cstddef> | ||
| # include <memory> | ||
| # include <string> | ||
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| OPENTELEMETRY_BEGIN_NAMESPACE | ||
| namespace exporter | ||
| { | ||
| namespace otlp | ||
| { | ||
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| /** | ||
| * Struct to hold OTLP exporter options. | ||
| */ | ||
| struct OtlpHttpMetricExporterOptions | ||
| { | ||
| // The endpoint to export to. By default | ||
| // @see | ||
| // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/otlp.md | ||
| // @see https://github.com/open-telemetry/opentelemetry-collector/tree/main/receiver/otlpreceiver | ||
| std::string url = GetOtlpDefaultHttpMetricEndpoint(); | ||
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| // By default, post json data | ||
| HttpRequestContentType content_type = HttpRequestContentType::kJson; | ||
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| // If convert bytes into hex. By default, we will convert all bytes but id into base64 | ||
| // This option is ignored if content_type is not kJson | ||
| JsonBytesMappingKind json_bytes_mapping = JsonBytesMappingKind::kHexId; | ||
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| // If using the json name of protobuf field to set the key of json. By default, we will use the | ||
| // field name just like proto files. | ||
| bool use_json_name = false; | ||
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| // Whether to print the status of the exporter in the console | ||
| bool console_debug = false; | ||
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| // TODO: Enable/disable to verify SSL certificate | ||
| std::chrono::system_clock::duration timeout = GetOtlpDefaultMetricTimeout(); | ||
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| // Additional HTTP headers | ||
| OtlpHeaders http_headers = GetOtlpDefaultMetricHeaders(); | ||
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| # ifdef ENABLE_ASYNC_EXPORT | ||
| // Concurrent requests | ||
| // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/otlp.md#otlpgrpc-concurrent-requests | ||
| std::size_t max_concurrent_requests = 64; | ||
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| // Requests per connections | ||
| std::size_t max_requests_per_connection = 8; | ||
| # endif | ||
| }; | ||
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| /** | ||
| * The OTLP exporter exports metrics data in OpenTelemetry Protocol (OTLP) format in HTTP. | ||
| */ | ||
| class OtlpHttpMetricExporter final : public opentelemetry::sdk::metrics::MetricExporter | ||
| { | ||
| public: | ||
| /** | ||
| * Create an OtlpHttpMetricExporter with default exporter options. | ||
| */ | ||
| OtlpHttpMetricExporter(); | ||
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| /** | ||
| * Create an OtlpHttpMetricExporter with user specified options. | ||
| * @param options An object containing the user's configuration options. | ||
| */ | ||
| OtlpHttpMetricExporter(const OtlpHttpMetricExporterOptions &options); | ||
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| opentelemetry::sdk::common::ExportResult Export( | ||
| const opentelemetry::sdk::metrics::ResourceMetrics &data) noexcept override; | ||
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| /** | ||
| * Force flush the exporter. | ||
| */ | ||
| bool ForceFlush( | ||
| std::chrono::microseconds timeout = (std::chrono::microseconds::max)()) noexcept override; | ||
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| bool Shutdown( | ||
| std::chrono::microseconds timeout = (std::chrono::microseconds::max)()) noexcept override; | ||
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| private: | ||
| // Configuration options for the exporter | ||
| const OtlpHttpMetricExporterOptions options_; | ||
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| // Object that stores the HTTP sessions that have been created | ||
| std::unique_ptr<OtlpHttpClient> http_client_; | ||
| // For testing | ||
| friend class OtlpHttpMetricExporterTestPeer; | ||
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| /** | ||
| * Create an OtlpHttpMetricExporter using the specified http client. | ||
| * Only tests can call this constructor directly. | ||
| * @param http_client the http client to be used for exporting | ||
| */ | ||
| OtlpHttpMetricExporter(std::unique_ptr<OtlpHttpClient> http_client); | ||
| }; | ||
| } // namespace otlp | ||
| } // namespace exporter | ||
| OPENTELEMETRY_END_NAMESPACE | ||
| #endif |
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