mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-12 10:04:29 +02:00
128 lines
3.1 KiB
Go
128 lines
3.1 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 otlpmetric
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import (
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"context"
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"errors"
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"sync"
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"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/metrictransform"
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"go.opentelemetry.io/otel/metric"
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metricsdk "go.opentelemetry.io/otel/sdk/export/metric"
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"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
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)
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var (
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errAlreadyStarted = errors.New("already started")
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)
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// Exporter exports metrics data in the OTLP wire format.
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type Exporter struct {
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client Client
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exportKindSelector metricsdk.ExportKindSelector
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mu sync.RWMutex
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started bool
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startOnce sync.Once
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stopOnce sync.Once
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}
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// Export exports a batch of metrics.
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func (e *Exporter) Export(ctx context.Context, checkpointSet metricsdk.CheckpointSet) error {
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rms, err := metrictransform.CheckpointSet(ctx, e, checkpointSet, 1)
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if err != nil {
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return err
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}
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if len(rms) == 0 {
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return nil
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}
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return e.client.UploadMetrics(ctx, rms)
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}
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// Start establishes a connection to the receiving endpoint.
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func (e *Exporter) Start(ctx context.Context) error {
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var err = errAlreadyStarted
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e.startOnce.Do(func() {
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e.mu.Lock()
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e.started = true
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e.mu.Unlock()
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err = e.client.Start(ctx)
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})
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return err
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}
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// Shutdown flushes all exports and closes all connections to the receiving endpoint.
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func (e *Exporter) Shutdown(ctx context.Context) error {
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e.mu.RLock()
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started := e.started
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e.mu.RUnlock()
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if !started {
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return nil
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}
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var err error
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e.stopOnce.Do(func() {
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err = e.client.Stop(ctx)
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e.mu.Lock()
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e.started = false
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e.mu.Unlock()
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})
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return err
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}
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func (e *Exporter) ExportKindFor(descriptor *metric.Descriptor, aggregatorKind aggregation.Kind) metricsdk.ExportKind {
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return e.exportKindSelector.ExportKindFor(descriptor, aggregatorKind)
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}
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var _ metricsdk.Exporter = (*Exporter)(nil)
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// New constructs a new Exporter and starts it.
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func New(ctx context.Context, client Client, opts ...Option) (*Exporter, error) {
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exp := NewUnstarted(client, opts...)
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if err := exp.Start(ctx); err != nil {
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return nil, err
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}
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return exp, nil
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}
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// NewUnstarted constructs a new Exporter and does not start it.
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func NewUnstarted(client Client, opts ...Option) *Exporter {
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cfg := config{
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// Note: the default ExportKindSelector is specified
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// as Cumulative:
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// https://github.com/open-telemetry/opentelemetry-specification/issues/731
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exportKindSelector: metricsdk.CumulativeExportKindSelector(),
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}
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for _, opt := range opts {
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opt.apply(&cfg)
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}
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e := &Exporter{
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client: client,
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exportKindSelector: cfg.exportKindSelector,
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}
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return e
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}
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