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Implement in-memory metric exporter
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Fixes #1405
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punya committed Sep 9, 2024
1 parent 4eb78a6 commit 0dae157
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Showing 9 changed files with 496 additions and 1 deletion.
3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -21,6 +21,9 @@ Increment the:
* [REMOVAL] Remove build option `WITH_DEPRECATED_SDK_FACTORY`
[#2717](https://github.com/open-telemetry/opentelemetry-cpp/pull/2717)

* [EXPORTER] Add in-memory metric exporter
[#3043](https://github.com/open-telemetry/opentelemetry-cpp/pull/3043)

Breaking changes:

* [REMOVAL] Remove build option `WITH_DEPRECATED_SDK_FACTORY`
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78 changes: 77 additions & 1 deletion exporters/memory/BUILD
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Expand Up @@ -4,14 +4,90 @@
package(default_visibility = ["//visibility:public"])

cc_library(
name = "in_memory_span_data",
name = "in_memory_metric_data",
srcs = [
"src/in_memory_metric_data.cc",
],
hdrs = [
"include/opentelemetry/exporters/memory/in_memory_metric_data.h",
],
strip_include_prefix = "include",
tags = [
"memory",
"test",
],
deps = [
":in_memory_data",
"//sdk/src/metrics",
],
)

cc_test(
name = "in_memory_metric_data_test",
srcs = ["test/in_memory_metric_data_test.cc"],
tags = [
"memory",
"test",
],
deps = [
":in_memory_metric_data",
"@com_google_googletest//:gtest_main",
],
)

cc_library(
name = "in_memory_metric_exporter_factory",
srcs = [
"src/in_memory_metric_exporter_factory.cc",
],
hdrs = [
"include/opentelemetry/exporters/memory/in_memory_metric_exporter_factory.h",
],
strip_include_prefix = "include",
tags = [
"memory",
"test",
],
deps = [
":in_memory_metric_data",
"//sdk/src/metrics",
],
)

cc_test(
name = "in_memory_metric_exporter_test",
srcs = ["test/in_memory_metric_exporter_test.cc"],
tags = [
"memory",
"test",
],
deps = [
":in_memory_metric_exporter_factory",
"@com_google_googletest//:gtest_main",
],
)

cc_library(
name = "in_memory_data",
hdrs = [
"include/opentelemetry/exporters/memory/in_memory_data.h",
],
strip_include_prefix = "include",
tags = ["memory"],
deps = [
"//sdk:headers",
],
)

cc_library(
name = "in_memory_span_data",
hdrs = [
"include/opentelemetry/exporters/memory/in_memory_span_data.h",
],
strip_include_prefix = "include",
tags = ["memory"],
deps = [
":in_memory_data",
"//api",
"//sdk/src/resource",
"//sdk/src/trace",
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38 changes: 38 additions & 0 deletions exporters/memory/CMakeLists.txt
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Expand Up @@ -16,9 +16,26 @@ set_target_version(opentelemetry_exporter_in_memory)
target_link_libraries(opentelemetry_exporter_in_memory
PUBLIC opentelemetry_trace)

add_library(
opentelemetry_exporter_in_memory_metric
src/in_memory_metric_exporter_factory.cc src/in_memory_metric_data.cc)

target_include_directories(
opentelemetry_exporter_in_memory_metric
PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
"$<INSTALL_INTERFACE:include>")

set_target_properties(opentelemetry_exporter_in_memory_metric
PROPERTIES EXPORT_NAME in_memory_metric_exporter)
set_target_version(opentelemetry_exporter_in_memory_metric)

target_link_libraries(opentelemetry_exporter_in_memory_metric
PUBLIC opentelemetry_metrics)

if(OPENTELEMETRY_INSTALL)
install(
TARGETS opentelemetry_exporter_in_memory
opentelemetry_exporter_in_memory_metric
EXPORT "${PROJECT_NAME}-target"
RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
Expand All @@ -35,16 +52,29 @@ if(BUILD_TESTING)
add_executable(in_memory_span_data_test test/in_memory_span_data_test.cc)
add_executable(in_memory_span_exporter_test
test/in_memory_span_exporter_test.cc)
add_executable(in_memory_metric_data_test test/in_memory_metric_data_test.cc)
add_executable(in_memory_metric_exporter_test
test/in_memory_metric_exporter_test.cc)

target_link_libraries(
in_memory_span_data_test ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT}
opentelemetry_exporter_in_memory opentelemetry_resources)

target_link_libraries(
in_memory_metric_data_test ${GTEST_BOTH_LIBRARIES}
${CMAKE_THREAD_LIBS_INIT} opentelemetry_exporter_in_memory_metric
opentelemetry_resources)

target_link_libraries(
in_memory_span_exporter_test ${GTEST_BOTH_LIBRARIES}
${CMAKE_THREAD_LIBS_INIT} opentelemetry_exporter_in_memory
opentelemetry_resources)

target_link_libraries(
in_memory_metric_exporter_test ${GTEST_BOTH_LIBRARIES}
${CMAKE_THREAD_LIBS_INIT} opentelemetry_exporter_in_memory_metric
opentelemetry_resources)

gtest_add_tests(
TARGET in_memory_span_data_test
TEST_PREFIX exporter.
Expand All @@ -53,4 +83,12 @@ if(BUILD_TESTING)
TARGET in_memory_span_exporter_test
TEST_PREFIX exporter.
TEST_LIST in_memory_span_exporter_test)
gtest_add_tests(
TARGET in_memory_metric_data_test
TEST_PREFIX exporter.
TEST_LIST in_memory_metric_data_test)
gtest_add_tests(
TARGET in_memory_metric_exporter_test
TEST_PREFIX exporter.
TEST_LIST in_memory_metric_exporter_test)
endif()
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@@ -0,0 +1,72 @@
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include <map>
#include <memory>
#include <string>
#include <tuple>

#include "opentelemetry/exporters/memory/in_memory_data.h"
#include "opentelemetry/sdk/metrics/data/metric_data.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
struct ResourceMetrics;
}
} // namespace sdk
namespace exporter
{
namespace memory
{

/// The abstract base class for types used to store in-memory data backing an
/// InMemoryMetricExporter.
class InMemoryMetricData
{
public:
InMemoryMetricData() = default;
virtual ~InMemoryMetricData() = default;

InMemoryMetricData(const InMemoryMetricData &) = delete;
InMemoryMetricData(InMemoryMetricData &&) = delete;
InMemoryMetricData &operator=(const InMemoryMetricData &) = delete;
InMemoryMetricData &operator=(InMemoryMetricData &&) = delete;

virtual void Add(std::unique_ptr<sdk::metrics::ResourceMetrics> resource_metrics) = 0;
};

/// An implementation of InMemoryMetricData that stores full-fidelity data points in a circular
/// buffer. This allows tests to inspect every aspect of exported data, in exchange for a somewhat
/// cumbersome API.
class CircularBufferInMemoryMetricData final : public InMemoryMetricData,
public InMemoryData<sdk::metrics::ResourceMetrics>
{
public:
explicit CircularBufferInMemoryMetricData(size_t buffer_size);
void Add(std::unique_ptr<sdk::metrics::ResourceMetrics> resource_metrics) override;
};

/// An implementation of InMemoryMetricData that stores only the most recent data point in each time
/// series, and allows convenient lookups of time series. This makes simple tests easier to write.
class SimpleAggregateInMemoryMetricData final : public InMemoryMetricData
{
public:
using AttributeToPoint = std::map<opentelemetry::sdk::metrics::PointAttributes,
opentelemetry::sdk::metrics::PointType>;

void Add(std::unique_ptr<sdk::metrics::ResourceMetrics> resource_metrics) override;
const AttributeToPoint &Get(const std::string &scope, const std::string &metric);
void Clear();

private:
std::map<std::tuple<std::string, std::string>, AttributeToPoint> data_;
};

} // namespace memory
} // namespace exporter
OPENTELEMETRY_END_NAMESPACE
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@@ -0,0 +1,44 @@
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include <memory>

#include "opentelemetry/sdk/metrics/instruments.h"
#include "opentelemetry/version.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
class PushMetricExporter;
} // namespace metrics
} // namespace sdk
namespace exporter
{
namespace memory
{
class InMemoryMetricData;

/// A factory for InMemoryMetricExporter
class InMemoryMetricExporterFactory
{
public:
/// Create a InMemoryMetricExporter with a default buffer size and aggregation
/// temporality selector.
/// @param [out] data the InMemoryMetricData the exporter will write to,
/// for the caller to inspect
/// @param [in] buffer_size number of entries to save in the circular buffer
/// @param [in] temporality output temporality as a function of instrument kind
static std::unique_ptr<opentelemetry::sdk::metrics::PushMetricExporter> Create(
const std::shared_ptr<InMemoryMetricData> &data,
const sdk::metrics::AggregationTemporalitySelector &temporality);

static std::unique_ptr<opentelemetry::sdk::metrics::PushMetricExporter> Create(
const std::shared_ptr<InMemoryMetricData> &data);
};
} // namespace memory
} // namespace exporter
OPENTELEMETRY_END_NAMESPACE
54 changes: 54 additions & 0 deletions exporters/memory/src/in_memory_metric_data.cc
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@@ -0,0 +1,54 @@
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#include "opentelemetry/exporters/memory/in_memory_metric_data.h"
#include "opentelemetry/sdk/instrumentationscope/instrumentation_scope.h"
#include "opentelemetry/sdk/metrics/export/metric_producer.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace exporter
{
namespace memory
{
using sdk::metrics::ResourceMetrics;

CircularBufferInMemoryMetricData::CircularBufferInMemoryMetricData(size_t buffer_size)
: InMemoryData(buffer_size)
{}

void CircularBufferInMemoryMetricData::Add(std::unique_ptr<ResourceMetrics> resource_metrics)
{
InMemoryData::Add(std::move(resource_metrics));
}

void SimpleAggregateInMemoryMetricData::Add(std::unique_ptr<ResourceMetrics> resource_metrics)
{
for (const auto &sm : resource_metrics->scope_metric_data_)
{
const auto &scope = sm.scope_->GetName();
for (const auto &m : sm.metric_data_)
{
const auto &metric = m.instrument_descriptor.name_;
for (const auto &pda : m.point_data_attr_)
{
data_[{scope, metric}].insert({pda.attributes, pda.point_data});
}
}
}
}

const SimpleAggregateInMemoryMetricData::AttributeToPoint &SimpleAggregateInMemoryMetricData::Get(
const std::string &scope,
const std::string &metric)
{
return data_[{scope, metric}];
}

void SimpleAggregateInMemoryMetricData::Clear()
{
data_.clear();
}

} // namespace memory
} // namespace exporter
OPENTELEMETRY_END_NAMESPACE
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