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decorator.go
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decorator.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 metrics
import (
"context"
"time"
"github.com/uber/jaeger-lib/metrics"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
// ReadMetricsDecorator wraps a spanstore.Reader and collects metrics around each read operation.
type ReadMetricsDecorator struct {
spanReader spanstore.Reader
findTracesMetrics *queryMetrics
findTraceIDsMetrics *queryMetrics
getTraceMetrics *queryMetrics
getServicesMetrics *queryMetrics
getOperationsMetrics *queryMetrics
}
type queryMetrics struct {
Errors metrics.Counter `metric:"requests" tags:"result=err"`
Successes metrics.Counter `metric:"requests" tags:"result=ok"`
Responses metrics.Timer `metric:"responses"` // used as a histogram, not necessary for GetTrace
ErrLatency metrics.Timer `metric:"latency" tags:"result=err"`
OKLatency metrics.Timer `metric:"latency" tags:"result=ok"`
}
func (q *queryMetrics) emit(err error, latency time.Duration, responses int) {
if err != nil {
q.Errors.Inc(1)
q.ErrLatency.Record(latency)
} else {
q.Successes.Inc(1)
q.OKLatency.Record(latency)
q.Responses.Record(time.Duration(responses))
}
}
// NewReadMetricsDecorator returns a new ReadMetricsDecorator.
func NewReadMetricsDecorator(spanReader spanstore.Reader, metricsFactory metrics.Factory) *ReadMetricsDecorator {
return &ReadMetricsDecorator{
spanReader: spanReader,
findTracesMetrics: buildQueryMetrics("find_traces", metricsFactory),
findTraceIDsMetrics: buildQueryMetrics("find_trace_ids", metricsFactory),
getTraceMetrics: buildQueryMetrics("get_trace", metricsFactory),
getServicesMetrics: buildQueryMetrics("get_services", metricsFactory),
getOperationsMetrics: buildQueryMetrics("get_operations", metricsFactory),
}
}
func buildQueryMetrics(operation string, metricsFactory metrics.Factory) *queryMetrics {
qMetrics := &queryMetrics{}
scoped := metricsFactory.Namespace(metrics.NSOptions{Name: "", Tags: map[string]string{"operation": operation}})
metrics.Init(qMetrics, scoped, nil)
return qMetrics
}
// FindTraces implements spanstore.Reader#FindTraces
func (m *ReadMetricsDecorator) FindTraces(ctx context.Context, traceQuery *spanstore.TraceQueryParameters) ([]*model.Trace, error) {
start := time.Now()
retMe, err := m.spanReader.FindTraces(ctx, traceQuery)
m.findTracesMetrics.emit(err, time.Since(start), len(retMe))
return retMe, err
}
// FindTraceIDs implements spanstore.Reader#FindTraceIDs
func (m *ReadMetricsDecorator) FindTraceIDs(ctx context.Context, traceQuery *spanstore.TraceQueryParameters) ([]model.TraceID, error) {
start := time.Now()
retMe, err := m.spanReader.FindTraceIDs(ctx, traceQuery)
m.findTraceIDsMetrics.emit(err, time.Since(start), len(retMe))
return retMe, err
}
// GetTrace implements spanstore.Reader#GetTrace
func (m *ReadMetricsDecorator) GetTrace(ctx context.Context, traceID model.TraceID) (*model.Trace, error) {
start := time.Now()
retMe, err := m.spanReader.GetTrace(ctx, traceID)
m.getTraceMetrics.emit(err, time.Since(start), 1)
return retMe, err
}
// GetServices implements spanstore.Reader#GetServices
func (m *ReadMetricsDecorator) GetServices(ctx context.Context) ([]string, error) {
start := time.Now()
retMe, err := m.spanReader.GetServices(ctx)
m.getServicesMetrics.emit(err, time.Since(start), len(retMe))
return retMe, err
}
// GetOperations implements spanstore.Reader#GetOperations
func (m *ReadMetricsDecorator) GetOperations(
ctx context.Context,
query spanstore.OperationQueryParameters,
) ([]spanstore.Operation, error) {
start := time.Now()
retMe, err := m.spanReader.GetOperations(ctx, query)
m.getOperationsMetrics.emit(err, time.Since(start), len(retMe))
return retMe, err
}