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server.go
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server.go
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package traceutils
import (
"context"
"fmt"
"math/rand"
"strings"
"testing"
"time"
"github.com/grafana/agent/pkg/util"
"github.com/open-telemetry/opentelemetry-collector-contrib/processor/spanmetricsprocessor/mocks"
"github.com/stretchr/testify/assert"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/config/configunmarshaler"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/model/pdata"
"go.opentelemetry.io/collector/receiver/otlpreceiver"
"go.opentelemetry.io/collector/service/external/builder"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"gopkg.in/yaml.v3"
)
// Server is a Tracing testing server that invokes a function every time a span
// is received.
type Server struct {
receivers builder.Receivers
pipelines builder.BuiltPipelines
exporters builder.Exporters
}
// NewTestServer creates a new Server for testing, where received traces will
// call the callback function. The returned string is the address where traces
// can be sent using OTLP.
func NewTestServer(t *testing.T, callback func(pdata.Traces)) string {
t.Helper()
srv, listenAddr, err := NewServerWithRandomPort(callback)
if err != nil {
t.Fatalf("failed to create OTLP server: %s", err)
}
t.Cleanup(func() {
err := srv.Stop()
assert.NoError(t, err)
})
return listenAddr
}
// NewServerWithRandomPort calls NewServer with a random port >49152 and
// <65535. It will try up to five times before failing.
func NewServerWithRandomPort(callback func(pdata.Traces)) (srv *Server, addr string, err error) {
var lastError error
for i := 0; i < 5; i++ {
port := rand.Intn(65535-49152) + 49152
listenAddr := fmt.Sprintf("127.0.0.1:%d", port)
srv, err = NewServer(listenAddr, callback)
if err != nil {
lastError = err
continue
}
return srv, listenAddr, nil
}
return nil, "", fmt.Errorf("failed 5 times to create a server. last error: %w", lastError)
}
// NewServer creates an OTLP-accepting server that calls a function when a
// trace is received. This is primarily useful for testing.
func NewServer(addr string, callback func(pdata.Traces)) (*Server, error) {
conf := util.Untab(fmt.Sprintf(`
processors:
func_processor:
receivers:
otlp:
protocols:
grpc:
endpoint: %s
exporters:
noop:
service:
pipelines:
traces:
receivers: [otlp]
processors: [func_processor]
exporters: [noop]
`, addr))
var cfg map[string]interface{}
if err := yaml.NewDecoder(strings.NewReader(conf)).Decode(&cfg); err != nil {
panic("could not decode config: " + err.Error())
}
extensionsFactory, err := component.MakeExtensionFactoryMap()
if err != nil {
return nil, fmt.Errorf("failed to make extension factory map: %w", err)
}
receiversFactory, err := component.MakeReceiverFactoryMap(otlpreceiver.NewFactory())
if err != nil {
return nil, fmt.Errorf("failed to make receiver factory map: %w", err)
}
exportersFactory, err := component.MakeExporterFactoryMap(newNoopExporterFactory())
if err != nil {
return nil, fmt.Errorf("failed to make exporter factory map: %w", err)
}
processorsFactory, err := component.MakeProcessorFactoryMap(
newFuncProcessorFactory(callback),
)
if err != nil {
return nil, fmt.Errorf("failed to make processor factory map: %w", err)
}
factories := component.Factories{
Extensions: extensionsFactory,
Receivers: receiversFactory,
Processors: processorsFactory,
Exporters: exportersFactory,
}
configMap := config.NewMapFromStringMap(cfg)
cfgUnmarshaler := configunmarshaler.NewDefault()
otelCfg, err := cfgUnmarshaler.Unmarshal(configMap, factories)
if err != nil {
return nil, fmt.Errorf("failed to make otel config: %w", err)
}
var (
logger = zap.NewNop()
startInfo component.BuildInfo
)
settings := component.TelemetrySettings{
Logger: logger,
TracerProvider: trace.NewNoopTracerProvider(),
MeterProvider: metric.NewNoopMeterProvider(),
}
exporters, err := builder.BuildExporters(settings, startInfo, otelCfg, factories.Exporters)
if err != nil {
return nil, fmt.Errorf("failed to build exporters: %w", err)
}
if err := exporters.StartAll(context.Background(), nil); err != nil {
return nil, fmt.Errorf("failed to start exporters: %w", err)
}
pipelines, err := builder.BuildPipelines(settings, startInfo, otelCfg, exporters, factories.Processors)
if err != nil {
return nil, fmt.Errorf("failed to build pipelines: %w", err)
}
if err := pipelines.StartProcessors(context.Background(), nil); err != nil {
return nil, fmt.Errorf("failed to start pipelines: %w", err)
}
receivers, err := builder.BuildReceivers(settings, startInfo, otelCfg, pipelines, factories.Receivers)
if err != nil {
return nil, fmt.Errorf("failed to build receivers: %w", err)
}
h := &mocks.Host{}
h.On("GetExtensions").Return(nil)
if err := receivers.StartAll(context.Background(), h); err != nil {
return nil, fmt.Errorf("failed to start receivers: %w", err)
}
return &Server{
receivers: receivers,
pipelines: pipelines,
exporters: exporters,
}, nil
}
// Stop stops the testing server.
func (s *Server) Stop() error {
shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
var firstErr error
deps := []func(context.Context) error{
s.receivers.ShutdownAll,
s.pipelines.ShutdownProcessors,
s.exporters.ShutdownAll,
}
for _, dep := range deps {
err := dep(shutdownCtx)
if err != nil && firstErr == nil {
firstErr = err
}
}
return firstErr
}
func newFuncProcessorFactory(callback func(pdata.Traces)) component.ProcessorFactory {
return component.NewProcessorFactory(
"func_processor",
func() config.Processor {
processorSettings := config.NewProcessorSettings(config.NewComponentIDWithName("func_processor", "func_processor"))
return &processorSettings
},
component.WithTracesProcessor(func(
_ context.Context,
_ component.ProcessorCreateSettings,
_ config.Processor,
next consumer.Traces,
) (component.TracesProcessor, error) {
return &funcProcessor{
Callback: callback,
Next: next,
}, nil
}),
)
}
type funcProcessor struct {
Callback func(pdata.Traces)
Next consumer.Traces
}
func (p *funcProcessor) ConsumeTraces(ctx context.Context, td pdata.Traces) error {
if p.Callback != nil {
p.Callback(td)
}
return p.Next.ConsumeTraces(ctx, td)
}
func (p *funcProcessor) Capabilities() consumer.Capabilities {
return consumer.Capabilities{MutatesData: true}
}
func (p *funcProcessor) Start(context.Context, component.Host) error { return nil }
func (p *funcProcessor) Shutdown(context.Context) error { return nil }
func newNoopExporterFactory() component.ExporterFactory {
return component.NewExporterFactory(
"noop",
func() config.Exporter {
exporterSettings := config.NewExporterSettings(config.NewComponentIDWithName("noop", "noop"))
return &exporterSettings
},
component.WithTracesExporter(func(
context.Context,
component.ExporterCreateSettings,
config.Exporter) (
component.TracesExporter,
error) {
return &noopExporter{}, nil
}),
)
}
type noopExporter struct{}
func (n noopExporter) Start(context.Context, component.Host) error { return nil }
func (n noopExporter) Shutdown(context.Context) error { return nil }
func (n noopExporter) Capabilities() consumer.Capabilities { return consumer.Capabilities{} }
func (n noopExporter) ConsumeTraces(context.Context, pdata.Traces) error { return nil }