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metric.go
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metric.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build go1.18
// +build go1.18
package opencensus // import "go.opentelemetry.io/otel/bridge/opencensus"
import (
"context"
ocmetricdata "go.opencensus.io/metric/metricdata"
"go.opencensus.io/metric/metricexport"
"go.opentelemetry.io/otel"
internal "go.opentelemetry.io/otel/bridge/opencensus/internal/ocmetric"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
"go.opentelemetry.io/otel/sdk/resource"
)
const scopeName = "go.opentelemetry.io/otel/bridge/opencensus"
// exporter implements the OpenCensus metric Exporter interface using an
// OpenTelemetry base exporter.
type exporter struct {
base metric.Exporter
res *resource.Resource
}
// NewMetricExporter returns an OpenCensus exporter that exports to an
// OpenTelemetry (push) exporter.
func NewMetricExporter(base metric.Exporter, res *resource.Resource) metricexport.Exporter {
return &exporter{base: base, res: res}
}
// ExportMetrics implements the OpenCensus metric Exporter interface by sending
// to an OpenTelemetry exporter.
func (e *exporter) ExportMetrics(ctx context.Context, ocmetrics []*ocmetricdata.Metric) error {
otelmetrics, err := internal.ConvertMetrics(ocmetrics)
if err != nil {
otel.Handle(err)
}
if len(otelmetrics) == 0 {
return nil
}
return e.base.Export(ctx, metricdata.ResourceMetrics{
Resource: e.res,
ScopeMetrics: []metricdata.ScopeMetrics{
{
Scope: instrumentation.Scope{
Name: scopeName,
},
Metrics: otelmetrics,
},
}})
}