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Implement ApplyConfig for Tempo #424
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,230 @@ | ||
package tempoutils | ||
|
||
import ( | ||
"context" | ||
"fmt" | ||
"math/rand" | ||
"strings" | ||
"testing" | ||
"time" | ||
|
||
"github.com/grafana/agent/pkg/util" | ||
"github.com/spf13/viper" | ||
"github.com/stretchr/testify/assert" | ||
"go.opentelemetry.io/collector/component" | ||
"go.opentelemetry.io/collector/config" | ||
"go.opentelemetry.io/collector/config/configmodels" | ||
"go.opentelemetry.io/collector/consumer" | ||
"go.opentelemetry.io/collector/consumer/pdata" | ||
"go.opentelemetry.io/collector/processor/processorhelper" | ||
"go.opentelemetry.io/collector/receiver/otlpreceiver" | ||
"go.opentelemetry.io/collector/service/builder" | ||
"go.uber.org/zap" | ||
"gopkg.in/yaml.v3" | ||
) | ||
|
||
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) | ||
}) | ||
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||
return listenAddr | ||
} | ||
|
||
// NewServerWithRandomAddress 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 | ||
service: | ||
pipelines: | ||
traces: | ||
receivers: [otlp] | ||
processors: [func_processor] | ||
exporters: [] | ||
`, addr)) | ||
|
||
var cfg map[string]interface{} | ||
if err := yaml.NewDecoder(strings.NewReader(conf)).Decode(&cfg); err != nil { | ||
panic("could not decode config: " + err.Error()) | ||
} | ||
|
||
v := viper.New() | ||
if err := v.MergeConfigMap(cfg); err != nil { | ||
return nil, fmt.Errorf("failed to merge in mapstructure config: %w", err) | ||
} | ||
|
||
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() | ||
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, | ||
} | ||
otelCfg, err := config.Load(v, factories) | ||
if err != nil { | ||
return nil, fmt.Errorf("failed to make otel config: %w", err) | ||
} | ||
|
||
var ( | ||
logger = zap.NewNop() | ||
startInfo component.ApplicationStartInfo | ||
) | ||
|
||
exporters, err := builder.NewExportersBuilder(logger, startInfo, otelCfg, factories.Exporters).Build() | ||
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.NewPipelinesBuilder(logger, startInfo, otelCfg, exporters, factories.Processors).Build() | ||
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.NewReceiversBuilder(logger, startInfo, otelCfg, pipelines, factories.Receivers).Build() | ||
if err != nil { | ||
return nil, fmt.Errorf("failed to build receivers: %w", err) | ||
} | ||
if err := receivers.StartAll(context.Background(), nil); err != nil { | ||
return nil, fmt.Errorf("failed to start receivers: %w", err) | ||
} | ||
|
||
return &Server{ | ||
receivers: receivers, | ||
pipelines: pipelines, | ||
exporters: exporters, | ||
}, nil | ||
} | ||
|
||
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 processorhelper.NewFactory( | ||
"func_processor", | ||
func() configmodels.Processor { | ||
return &configmodels.ProcessorSettings{ | ||
TypeVal: "func_processor", | ||
NameVal: "func_processor", | ||
} | ||
}, | ||
processorhelper.WithTraces(func( | ||
_ context.Context, | ||
_ component.ProcessorCreateParams, | ||
_ configmodels.Processor, | ||
next consumer.TracesConsumer, | ||
) (component.TracesProcessor, error) { | ||
return &funcProcessor{ | ||
Callback: callback, | ||
Next: next, | ||
}, nil | ||
}), | ||
) | ||
} | ||
|
||
type funcProcessor struct { | ||
Callback func(pdata.Traces) | ||
Next consumer.TracesConsumer | ||
} | ||
|
||
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) GetCapabilities() component.ProcessorCapabilities { | ||
return component.ProcessorCapabilities{MutatesConsumedData: true} | ||
} | ||
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func (p *funcProcessor) Start(context.Context, component.Host) error { return nil } | ||
func (p *funcProcessor) Shutdown(context.Context) error { return nil } |
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@joe-elliott heads up: you were shutting down receivers twice, but I think you meant to shutdown the exporter here instead.