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feat(kuma-cp): introduce OpenTelemetry tracing
Signed-off-by: Mike Beaumont <mjboamail@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| package tracing | ||
|
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| type Config struct { | ||
| OpenTelemetry OpenTelemetry `json:"openTelemetry"` | ||
| } | ||
|
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| type OpenTelemetry struct { | ||
| // Address of OpenTelemetry collector. | ||
| // E.g. otel-collector:4317 | ||
| Endpoint string `json:"endpoint"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package opentelemetry | ||
|
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
|
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| "github.com/kumahq/kuma/pkg/config/tracing" | ||
| "github.com/kumahq/kuma/pkg/core" | ||
| core_plugins "github.com/kumahq/kuma/pkg/core/plugins" | ||
| core_runtime "github.com/kumahq/kuma/pkg/core/runtime" | ||
| "github.com/kumahq/kuma/pkg/core/runtime/component" | ||
| "github.com/kumahq/kuma/pkg/plugins/runtime/gateway/metadata" | ||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc" | ||
| "go.opentelemetry.io/otel/propagation" | ||
| "go.opentelemetry.io/otel/sdk/resource" | ||
| "go.opentelemetry.io/otel/sdk/trace" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/credentials/insecure" | ||
| ) | ||
|
|
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| func init() { | ||
| core_plugins.Register(metadata.PluginName, &plugin{}) | ||
| } | ||
|
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| var log = core.Log.WithName("plugin").WithName("runtime").WithName("gateway") | ||
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| type plugin struct{} | ||
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| var _ core_plugins.RuntimePlugin = &plugin{} | ||
|
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| type tracer struct { | ||
| config tracing.OpenTelemetry | ||
| provider *trace.TracerProvider | ||
| } | ||
|
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| var _ component.Component = &tracer{} | ||
|
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| func (t *tracer) Start(stop <-chan struct{}) error { | ||
| shutdown, err := initOtel(context.Background(), t.config) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| go func() { | ||
| <-stop | ||
| shutdown(context.Background()) | ||
| }() | ||
|
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| return nil | ||
| } | ||
|
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| func (t *tracer) NeedLeaderElection() bool { | ||
| return false | ||
| } | ||
|
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| func (p *plugin) Customize(rt core_runtime.Runtime) error { | ||
| tracing := rt.Config().Tracing | ||
| if tracing == nil { | ||
| return nil | ||
| } | ||
|
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| t := tracer{ | ||
| config: tracing.OpenTelemetry, | ||
| } | ||
| if err := rt.Add(component.NewResilientComponent(core.Log.WithName("otel-tracer"), &t)); err != nil { | ||
| return err | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| func initOtel(ctx context.Context, otelConfig tracing.OpenTelemetry) (func(context.Context) error, error) { | ||
| res, err := resource.New(ctx) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create resource: %w", err) | ||
| } | ||
|
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| ctx, cancel := context.WithTimeout(ctx, time.Second) | ||
| defer cancel() | ||
|
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| conn, err := grpc.DialContext( | ||
| ctx, | ||
| otelConfig.Endpoint, | ||
| grpc.WithTransportCredentials( | ||
| insecure.NewCredentials(), | ||
| ), | ||
| ) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create gRPC connection to collector: %w", err) | ||
| } | ||
|
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| traceExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create trace exporter: %w", err) | ||
| } | ||
|
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| bsp := trace.NewBatchSpanProcessor(traceExporter) | ||
|
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| tracerProvider := trace.NewTracerProvider( | ||
| trace.WithSampler(trace.AlwaysSample()), | ||
| trace.WithResource(res), | ||
| trace.WithSpanProcessor(bsp), | ||
| ) | ||
| otel.SetTracerProvider(tracerProvider) | ||
|
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| otel.SetTextMapPropagator(propagation.TraceContext{}) | ||
|
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| return tracerProvider.Shutdown, nil | ||
| } |