/
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.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/configmodels"
"go.opentelemetry.io/collector/consumer/consumerdata"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/consumer/pdata"
"go.opentelemetry.io/collector/obsreport"
)
// NumTimeSeries returns the number of timeseries in a MetricsData.
func NumTimeSeries(md consumerdata.MetricsData) int {
receivedTimeSeries := 0
for _, metric := range md.Metrics {
receivedTimeSeries += len(metric.GetTimeseries())
}
return receivedTimeSeries
}
// PushMetricsData is a helper function that is similar to ConsumeMetricsData but also returns
// the number of dropped metrics.
type PushMetricsData func(ctx context.Context, md pdata.Metrics) (droppedTimeSeries int, err error)
type metricsRequest struct {
baseRequest
md pdata.Metrics
pusher PushMetricsData
}
func newMetricsRequest(ctx context.Context, md pdata.Metrics, pusher PushMetricsData) request {
return &metricsRequest{
baseRequest: baseRequest{ctx: ctx},
md: md,
pusher: pusher,
}
}
func (req *metricsRequest) onPartialError(consumererror.PartialError) request {
// TODO: implement this.
return req
}
func (req *metricsRequest) export(ctx context.Context) (int, error) {
return req.pusher(ctx, req.md)
}
func (req *metricsRequest) count() int {
_, numPoints := req.md.MetricAndDataPointCount()
return numPoints
}
type metricsExporter struct {
*baseExporter
pusher PushMetricsData
}
func (mexp *metricsExporter) ConsumeMetrics(ctx context.Context, md pdata.Metrics) error {
exporterCtx := obsreport.ExporterContext(ctx, mexp.cfg.Name())
req := newMetricsRequest(exporterCtx, md, mexp.pusher)
_, err := mexp.sender.send(req)
return err
}
// NewMetricsExporter creates an MetricsExporter that records observability metrics and wraps every request with a Span.
func NewMetricsExporter(cfg configmodels.Exporter, pushMetricsData PushMetricsData, options ...ExporterOption) (component.MetricsExporter, error) {
if cfg == nil {
return nil, errNilConfig
}
if pushMetricsData == nil {
return nil, errNilPushMetricsData
}
be := newBaseExporter(cfg, options...)
be.wrapConsumerSender(func(nextSender requestSender) requestSender {
return &metricsSenderWithObservability{
exporterName: cfg.Name(),
nextSender: nextSender,
}
})
return &metricsExporter{
baseExporter: be,
pusher: pushMetricsData,
}, nil
}
type metricsSenderWithObservability struct {
exporterName string
nextSender requestSender
}
func (mewo *metricsSenderWithObservability) send(req request) (int, error) {
req.setContext(obsreport.StartMetricsExportOp(req.context(), mewo.exporterName))
numDroppedMetrics, err := mewo.nextSender.send(req)
// TODO: this is not ideal: it should come from the next function itself.
// temporarily loading it from internal format. Once full switch is done
// to new metrics will remove this.
mReq := req.(*metricsRequest)
numReceivedMetrics, numPoints := mReq.md.MetricAndDataPointCount()
obsreport.EndMetricsExportOp(req.context(), numPoints, numReceivedMetrics, numDroppedMetrics, err)
return numReceivedMetrics, err
}