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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| // 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. | ||
|
|
||
| package otlpmetric // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric" | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| metricpb "go.opentelemetry.io/proto/otlp/metrics/v1" | ||
| ) | ||
|
|
||
| // Client manages connections to the collector, handles the | ||
| // transformation of data into wire format, and the transmission of that | ||
| // data to the collector. | ||
| type Client interface { | ||
| // Start should establish connection(s) to endpoint(s). It is | ||
| // called just once by the exporter, so the implementation | ||
| // does not need to worry about idempotence and locking. | ||
| Start(ctx context.Context) error | ||
| // Stop should close the connections. The function is called | ||
| // only once by the exporter, so the implementation does not | ||
| // need to worry about idempotence, but it may be called | ||
| // concurrently with UploadMetrics, so proper | ||
| // locking is required. The function serves as a | ||
| // synchronization point - after the function returns, the | ||
| // process of closing connections is assumed to be finished. | ||
| Stop(ctx context.Context) error | ||
| // UploadMetrics should transform the passed metrics to the | ||
| // wire format and send it to the collector. May be called | ||
| // concurrently. | ||
| UploadMetrics(ctx context.Context, protoMetrics []*metricpb.ResourceMetrics) error | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // 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. | ||
|
|
||
| package otlpmetric | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "sync" | ||
|
|
||
| "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/metrictransform" | ||
| "go.opentelemetry.io/otel/metric" | ||
| metricsdk "go.opentelemetry.io/otel/sdk/export/metric" | ||
| "go.opentelemetry.io/otel/sdk/export/metric/aggregation" | ||
| ) | ||
|
|
||
| var ( | ||
| errAlreadyStarted = errors.New("already started") | ||
| ) | ||
|
|
||
| // Exporter exports metrics data in the OTLP wire format. | ||
| type Exporter struct { | ||
| client Client | ||
| exportKindSelector metricsdk.ExportKindSelector | ||
|
|
||
| mu sync.RWMutex | ||
| started bool | ||
|
|
||
| startOnce sync.Once | ||
| stopOnce sync.Once | ||
| } | ||
|
|
||
| // Export exports a batch of metrics. | ||
| func (e *Exporter) Export(ctx context.Context, checkpointSet metricsdk.CheckpointSet) error { | ||
| rms, err := metrictransform.CheckpointSet(ctx, e, checkpointSet, 1) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(rms) == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| return e.client.UploadMetrics(ctx, rms) | ||
| } | ||
|
|
||
| // Start establishes a connection to the receiving endpoint. | ||
| func (e *Exporter) Start(ctx context.Context) error { | ||
| var err = errAlreadyStarted | ||
| e.startOnce.Do(func() { | ||
| e.mu.Lock() | ||
| e.started = true | ||
| e.mu.Unlock() | ||
| err = e.client.Start(ctx) | ||
| }) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| // Shutdown flushes all exports and closes all connections to the receiving endpoint. | ||
| func (e *Exporter) Shutdown(ctx context.Context) error { | ||
|
|
||
| e.mu.RLock() | ||
| started := e.started | ||
| e.mu.RUnlock() | ||
|
|
||
| if !started { | ||
| return nil | ||
| } | ||
|
|
||
| var err error | ||
|
|
||
| e.stopOnce.Do(func() { | ||
| err = e.client.Stop(ctx) | ||
| e.mu.Lock() | ||
| e.started = false | ||
| e.mu.Unlock() | ||
| }) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| func (e *Exporter) ExportKindFor(descriptor *metric.Descriptor, aggregatorKind aggregation.Kind) metricsdk.ExportKind { | ||
| return e.exportKindSelector.ExportKindFor(descriptor, aggregatorKind) | ||
| } | ||
|
|
||
| var _ metricsdk.Exporter = (*Exporter)(nil) | ||
|
|
||
| // New constructs a new Exporter and starts it. | ||
| func New(ctx context.Context, client Client, opts ...Option) (*Exporter, error) { | ||
| exp := NewUnstarted(client, opts...) | ||
| if err := exp.Start(ctx); err != nil { | ||
| return nil, err | ||
| } | ||
| return exp, nil | ||
| } | ||
|
|
||
| // NewUnstarted constructs a new Exporter and does not start it. | ||
| func NewUnstarted(client Client, opts ...Option) *Exporter { | ||
| cfg := config{ | ||
| // Note: the default ExportKindSelector is specified | ||
| // as Cumulative: | ||
| // https://github.com/open-telemetry/opentelemetry-specification/issues/731 | ||
| exportKindSelector: metricsdk.CumulativeExportKindSelector(), | ||
| } | ||
|
|
||
| for _, opt := range opts { | ||
| opt.apply(&cfg) | ||
| } | ||
|
|
||
| e := &Exporter{ | ||
| client: client, | ||
| exportKindSelector: cfg.exportKindSelector, | ||
| } | ||
|
|
||
| return e | ||
| } |
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