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opentelemetry-go/exporters/otlp/otlpmetric/otlpmetricgrpc/mock_collector_test.go
Tyler Yahn fdfc821bac
Add godot linter to golangci (#2845)
Comment should be complete sentences outside of lists with sentence
fragments. This adds the godot linter to check these complete sentences
end with punctuation. If they do not, running fix will append a period.
2022-04-25 13:22:49 -07:00

170 lines
4.0 KiB
Go

// 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 otlpmetricgrpc_test
import (
"context"
"fmt"
"net"
"sync"
"testing"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/otlpmetrictest"
collectormetricpb "go.opentelemetry.io/proto/otlp/collector/metrics/v1"
metricpb "go.opentelemetry.io/proto/otlp/metrics/v1"
)
func makeMockCollector(t *testing.T, mockConfig *mockConfig) *mockCollector {
return &mockCollector{
t: t,
metricSvc: &mockMetricService{
storage: otlpmetrictest.NewMetricsStorage(),
errors: mockConfig.errors,
},
}
}
type mockMetricService struct {
collectormetricpb.UnimplementedMetricsServiceServer
requests int
errors []error
headers metadata.MD
mu sync.RWMutex
storage otlpmetrictest.MetricsStorage
delay time.Duration
}
func (mms *mockMetricService) getHeaders() metadata.MD {
mms.mu.RLock()
defer mms.mu.RUnlock()
return mms.headers
}
func (mms *mockMetricService) getMetrics() []*metricpb.Metric {
mms.mu.RLock()
defer mms.mu.RUnlock()
return mms.storage.GetMetrics()
}
func (mms *mockMetricService) Export(ctx context.Context, exp *collectormetricpb.ExportMetricsServiceRequest) (*collectormetricpb.ExportMetricsServiceResponse, error) {
if mms.delay > 0 {
time.Sleep(mms.delay)
}
mms.mu.Lock()
defer func() {
mms.requests++
mms.mu.Unlock()
}()
reply := &collectormetricpb.ExportMetricsServiceResponse{}
if mms.requests < len(mms.errors) {
idx := mms.requests
return reply, mms.errors[idx]
}
mms.headers, _ = metadata.FromIncomingContext(ctx)
mms.storage.AddMetrics(exp)
return reply, nil
}
type mockCollector struct {
t *testing.T
metricSvc *mockMetricService
endpoint string
stopFunc func()
stopOnce sync.Once
}
type mockConfig struct {
errors []error
endpoint string
}
var _ collectormetricpb.MetricsServiceServer = (*mockMetricService)(nil)
var errAlreadyStopped = fmt.Errorf("already stopped")
func (mc *mockCollector) stop() error {
var err = errAlreadyStopped
mc.stopOnce.Do(func() {
err = nil
if mc.stopFunc != nil {
mc.stopFunc()
}
})
// Give it sometime to shutdown.
<-time.After(160 * time.Millisecond)
// Wait for services to finish reading/writing.
// Getting the lock ensures the metricSvc is done flushing.
mc.metricSvc.mu.Lock()
defer mc.metricSvc.mu.Unlock()
return err
}
func (mc *mockCollector) Stop() error {
return mc.stop()
}
func (mc *mockCollector) getHeaders() metadata.MD {
return mc.metricSvc.getHeaders()
}
func (mc *mockCollector) getMetrics() []*metricpb.Metric {
return mc.metricSvc.getMetrics()
}
func (mc *mockCollector) GetMetrics() []*metricpb.Metric {
return mc.getMetrics()
}
// runMockCollector is a helper function to create a mock Collector.
func runMockCollector(t *testing.T) *mockCollector {
return runMockCollectorAtEndpoint(t, "localhost:0")
}
func runMockCollectorAtEndpoint(t *testing.T, endpoint string) *mockCollector {
return runMockCollectorWithConfig(t, &mockConfig{endpoint: endpoint})
}
func runMockCollectorWithConfig(t *testing.T, mockConfig *mockConfig) *mockCollector {
ln, err := net.Listen("tcp", mockConfig.endpoint)
if err != nil {
t.Fatalf("Failed to get an endpoint: %v", err)
}
srv := grpc.NewServer()
mc := makeMockCollector(t, mockConfig)
collectormetricpb.RegisterMetricsServiceServer(srv, mc.metricSvc)
go func() {
_ = srv.Serve(ln)
}()
mc.endpoint = ln.Addr().String()
// srv.Stop calls Close on mc.ln.
mc.stopFunc = srv.Stop
return mc
}