forked from open-telemetry/opentelemetry-collector-contrib
/
metricshelper.go
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/
metricshelper.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.
package exporterhelper
import (
"context"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/configmodels"
"go.opentelemetry.io/collector/config/configtelemetry"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/consumer/pdata"
"go.opentelemetry.io/collector/obsreport"
)
// PushMetrics is a helper function that is similar to ConsumeMetrics but also returns
// the number of dropped metrics.
type PushMetrics func(ctx context.Context, md pdata.Metrics) error
type metricsRequest struct {
baseRequest
md pdata.Metrics
pusher PushMetrics
}
func newMetricsRequest(ctx context.Context, md pdata.Metrics, pusher PushMetrics) request {
return &metricsRequest{
baseRequest: baseRequest{ctx: ctx},
md: md,
pusher: pusher,
}
}
func (req *metricsRequest) onError(err error) request {
var metricsError consumererror.Metrics
if consumererror.AsMetrics(err, &metricsError) {
return newMetricsRequest(req.ctx, metricsError.GetMetrics(), req.pusher)
}
return req
}
func (req *metricsRequest) export(ctx context.Context) error {
return req.pusher(ctx, req.md)
}
func (req *metricsRequest) count() int {
_, numPoints := req.md.MetricAndDataPointCount()
return numPoints
}
type metricsExporter struct {
*baseExporter
pusher PushMetrics
}
func (mexp *metricsExporter) ConsumeMetrics(ctx context.Context, md pdata.Metrics) error {
if mexp.baseExporter.convertResourceToTelemetry {
md = convertResourceToLabels(md)
}
return mexp.sender.send(newMetricsRequest(ctx, md, mexp.pusher))
}
// NewMetricsExporter creates an MetricsExporter that records observability metrics and wraps every request with a Span.
func NewMetricsExporter(
cfg configmodels.Exporter,
logger *zap.Logger,
pusher PushMetrics,
options ...Option,
) (component.MetricsExporter, error) {
if cfg == nil {
return nil, errNilConfig
}
if logger == nil {
return nil, errNilLogger
}
if pusher == nil {
return nil, errNilPushMetricsData
}
be := newBaseExporter(cfg, logger, options...)
be.wrapConsumerSender(func(nextSender requestSender) requestSender {
return &metricsSenderWithObservability{
obsrep: obsreport.NewExporter(obsreport.ExporterSettings{
Level: configtelemetry.GetMetricsLevelFlagValue(),
ExporterName: cfg.Name(),
}),
nextSender: nextSender,
}
})
return &metricsExporter{
baseExporter: be,
pusher: pusher,
}, nil
}
type metricsSenderWithObservability struct {
obsrep *obsreport.Exporter
nextSender requestSender
}
func (mewo *metricsSenderWithObservability) send(req request) error {
req.setContext(mewo.obsrep.StartMetricsExportOp(req.context()))
err := mewo.nextSender.send(req)
mewo.obsrep.EndMetricsExportOp(req.context(), req.count(), err)
return err
}