mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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037719b646
* Replace view usage in sdk/metric * Replace view use in stdoutmetric * Replace view use in prometheus exporter * Replace view use in otlpmetric exporters * Replace view use in view example
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
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import (
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"context"
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/otel/sdk/metric"
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"go.opentelemetry.io/otel/sdk/metric/aggregation"
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"go.opentelemetry.io/otel/sdk/metric/metricdata"
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)
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// exporter is an OpenTelemetry metric exporter.
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type exporter struct {
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encVal atomic.Value // encoderHolder
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shutdownOnce sync.Once
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temporalitySelector metric.TemporalitySelector
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aggregationSelector metric.AggregationSelector
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}
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// New returns a configured metric exporter.
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//
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// If no options are passed, the default exporter returned will use a JSON
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// encoder with tab indentations that output to STDOUT.
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func New(options ...Option) (metric.Exporter, error) {
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cfg := newConfig(options...)
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exp := &exporter{
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temporalitySelector: cfg.temporalitySelector,
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aggregationSelector: cfg.aggregationSelector,
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}
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exp.encVal.Store(*cfg.encoder)
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return exp, nil
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}
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func (e *exporter) Temporality(k metric.InstrumentKind) metricdata.Temporality {
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return e.temporalitySelector(k)
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}
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func (e *exporter) Aggregation(k metric.InstrumentKind) aggregation.Aggregation {
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return e.aggregationSelector(k)
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}
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func (e *exporter) Export(ctx context.Context, data metricdata.ResourceMetrics) error {
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select {
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case <-ctx.Done():
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// Don't do anything if the context has already timed out.
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return ctx.Err()
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default:
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// Context is still valid, continue.
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}
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return e.encVal.Load().(encoderHolder).Encode(data)
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}
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func (e *exporter) ForceFlush(ctx context.Context) error {
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// exporter holds no state, nothing to flush.
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return ctx.Err()
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}
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func (e *exporter) Shutdown(ctx context.Context) error {
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e.shutdownOnce.Do(func() {
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e.encVal.Store(encoderHolder{
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encoder: shutdownEncoder{},
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})
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})
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return ctx.Err()
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}
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