56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
|
package opentracing
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
|
||
|
|
"github.com/opentracing/opentracing-go"
|
||
|
|
otext "github.com/opentracing/opentracing-go/ext"
|
||
|
|
|
||
|
|
"github.com/go-kit/kit/endpoint"
|
||
|
|
)
|
||
|
|
|
||
|
|
// TraceServer returns a Middleware that wraps the `next` Endpoint in an
|
||
|
|
// OpenTracing Span called `operationName`.
|
||
|
|
//
|
||
|
|
// If `ctx` already has a Span, it is re-used and the operation name is
|
||
|
|
// overwritten. If `ctx` does not yet have a Span, one is created here.
|
||
|
|
func TraceServer(tracer opentracing.Tracer, operationName string) endpoint.Middleware {
|
||
|
|
return func(next endpoint.Endpoint) endpoint.Endpoint {
|
||
|
|
return func(ctx context.Context, request interface{}) (interface{}, error) {
|
||
|
|
serverSpan := opentracing.SpanFromContext(ctx)
|
||
|
|
if serverSpan == nil {
|
||
|
|
// All we can do is create a new root span.
|
||
|
|
serverSpan = tracer.StartSpan(operationName)
|
||
|
|
} else {
|
||
|
|
serverSpan.SetOperationName(operationName)
|
||
|
|
}
|
||
|
|
defer serverSpan.Finish()
|
||
|
|
otext.SpanKindRPCServer.Set(serverSpan)
|
||
|
|
ctx = opentracing.ContextWithSpan(ctx, serverSpan)
|
||
|
|
return next(ctx, request)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// TraceClient returns a Middleware that wraps the `next` Endpoint in an
|
||
|
|
// OpenTracing Span called `operationName`.
|
||
|
|
func TraceClient(tracer opentracing.Tracer, operationName string) endpoint.Middleware {
|
||
|
|
return func(next endpoint.Endpoint) endpoint.Endpoint {
|
||
|
|
return func(ctx context.Context, request interface{}) (interface{}, error) {
|
||
|
|
var clientSpan opentracing.Span
|
||
|
|
if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
|
||
|
|
clientSpan = tracer.StartSpan(
|
||
|
|
operationName,
|
||
|
|
opentracing.ChildOf(parentSpan.Context()),
|
||
|
|
)
|
||
|
|
} else {
|
||
|
|
clientSpan = tracer.StartSpan(operationName)
|
||
|
|
}
|
||
|
|
defer clientSpan.Finish()
|
||
|
|
otext.SpanKindRPCClient.Set(clientSpan)
|
||
|
|
ctx = opentracing.ContextWithSpan(ctx, clientSpan)
|
||
|
|
return next(ctx, request)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|