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Merge pull request #271 from maxekman/tracing
Tracing with OpenTracing
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // Copyright (c) 2020 - The Event Horizon 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 tracing | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "log" | ||
|
|
||
| eh "github.com/looplab/eventhorizon" | ||
| "github.com/opentracing/opentracing-go" | ||
| "github.com/opentracing/opentracing-go/ext" | ||
| ) | ||
|
|
||
| // The string keys to marshal the context. | ||
| const ( | ||
| tracingSpanKeyStr = "eh_tracing_span" | ||
| ) | ||
|
|
||
| func init() { | ||
| eh.RegisterContextMarshaler(func(ctx context.Context, vals map[string]interface{}) { | ||
| if span := opentracing.SpanFromContext(ctx); span != nil { | ||
| tracer := opentracing.GlobalTracer() | ||
| carrier := opentracing.TextMapCarrier{} | ||
| if err := tracer.Inject(span.Context(), opentracing.TextMap, &carrier); err != nil { | ||
| log.Printf("eventhorizon: could not inject tracing span: %s", err) | ||
| return | ||
| } | ||
| js, err := json.Marshal(carrier) | ||
| if err != nil { | ||
| log.Printf("eventhorizon: could not marshal tracing span: %s", err) | ||
| return | ||
| } | ||
| vals[tracingSpanKeyStr] = string(js) | ||
| } | ||
| }) | ||
| eh.RegisterContextUnmarshaler(func(ctx context.Context, vals map[string]interface{}) context.Context { | ||
| if js, ok := vals[tracingSpanKeyStr].(string); ok { | ||
| tracer := opentracing.GlobalTracer() | ||
| carrier := opentracing.TextMapCarrier{} | ||
| if err := json.Unmarshal([]byte(js), &carrier); err != nil { | ||
| log.Printf("eventhorizon: could not unmarshal tracing span: %s", err) | ||
| return ctx | ||
| } | ||
| parentSpanContext, err := tracer.Extract(opentracing.TextMap, carrier) | ||
| if err != nil && err != opentracing.ErrSpanContextNotFound { | ||
| log.Printf("eventhorizon: could not extract tracing span: %s", err) | ||
| return ctx | ||
| } | ||
| span := tracer.StartSpan("eventbus", ext.RPCServerOption(parentSpanContext)) | ||
| ctx = opentracing.ContextWithSpan(ctx, span) | ||
| } | ||
| return ctx | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| // Copyright (c) 2020 - The Event Horizon 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 tracing | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| eh "github.com/looplab/eventhorizon" | ||
| "github.com/looplab/eventhorizon/middleware/eventhandler/tracing" | ||
| ) | ||
|
|
||
| // EventBus is an event bus wrapper that adds tracing. | ||
| type EventBus struct { | ||
| eh.EventBus | ||
| h eh.EventHandler | ||
| } | ||
|
|
||
| // NewEventBus creates a EventBus. | ||
| func NewEventBus(eventBus eh.EventBus) *EventBus { | ||
| return &EventBus{ | ||
| EventBus: eventBus, | ||
| // Wrap the eh.EventHandler part of the bus with tracing middleware, | ||
| // set as producer to set the correct tags. | ||
| h: eh.UseEventHandlerMiddleware(eventBus, tracing.NewMiddleware()), | ||
| } | ||
| } | ||
|
|
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| // HandleEvent implements the HandleEvent method of the eventhorizon.EventHandler interface. | ||
| func (b *EventBus) HandleEvent(ctx context.Context, event eh.Event) error { | ||
| return b.h.HandleEvent(ctx, event) | ||
| } | ||
|
|
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| // AddHandler implements the AddHandler method of the eventhorizon.EventBus interface. | ||
| func (b *EventBus) AddHandler(ctx context.Context, m eh.EventMatcher, h eh.EventHandler) error { | ||
| if h == nil { | ||
| return eh.ErrMissingHandler | ||
| } | ||
| // Wrap the handlers in tracing middleware. | ||
| h = eh.UseEventHandlerMiddleware(h, tracing.NewMiddleware()) | ||
| return b.EventBus.AddHandler(ctx, m, h) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| // Copyright (c) 2020 - The Event Horizon 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 tracing | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/looplab/eventhorizon/eventbus" | ||
| "github.com/looplab/eventhorizon/eventbus/local" | ||
| ) | ||
|
|
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| func TestEventBus(t *testing.T) { | ||
| group := local.NewGroup() | ||
| if group == nil { | ||
| t.Fatal("there should be a group") | ||
| } | ||
| innerBus1 := local.NewEventBus(group) | ||
| if innerBus1 == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
| innerBus2 := local.NewEventBus(group) | ||
| if innerBus2 == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
|
|
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| bus1 := NewEventBus(innerBus1) | ||
| if bus1 == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
|
|
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| bus2 := NewEventBus(innerBus2) | ||
| if bus2 == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
|
|
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| eventbus.AcceptanceTest(t, bus1, bus2, time.Second) | ||
| } | ||
|
|
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| func TestEventBusLoad(t *testing.T) { | ||
| innerBus := local.NewEventBus(nil) | ||
| if innerBus == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
|
|
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| bus := NewEventBus(innerBus) | ||
| if bus == nil { | ||
| t.Fatal("there should be a bus") | ||
| } | ||
|
|
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| eventbus.LoadTest(t, bus) | ||
| } | ||
|
|
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| func BenchmarkEventBus(b *testing.B) { | ||
| innerBus := local.NewEventBus(nil) | ||
| if innerBus == nil { | ||
| b.Fatal("there should be a bus") | ||
| } | ||
|
|
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| bus := NewEventBus(innerBus) | ||
| if bus == nil { | ||
| b.Fatal("there should be a bus") | ||
| } | ||
|
|
||
| eventbus.Benchmark(b, bus) | ||
| } |
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