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server.go
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server.go
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// Copyright 2021 CloudWeGo 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 opentracing
import (
"context"
"github.com/cloudwego/kitex/pkg/rpcinfo"
"github.com/cloudwego/kitex/pkg/stats"
"github.com/cloudwego/kitex/pkg/transmeta"
"github.com/cloudwego/kitex/server"
"github.com/opentracing/opentracing-go"
)
var _ stats.Tracer = &serverTracer{}
type serverTracer struct {
commonTracer
}
type traceContainer struct {
serverTracer *serverTracer
span opentracing.Span
}
func (o *serverTracer) Start(ctx context.Context) context.Context {
ctx = context.WithValue(ctx, traceContainerKey, &traceContainer{serverTracer: o})
return ctx
}
func (o *serverTracer) Finish(ctx context.Context) {
tc, ok := ctx.Value(traceContainerKey).(*traceContainer)
if !ok || tc.span == nil {
panic("get tracer container failed")
}
rpcSpan := tc.span
ri := rpcinfo.GetRPCInfo(ctx)
st := ri.Stats()
// new common rpc span
o.newCommonSpan(rpcSpan, st)
// new handler span
o.newEventSpan("handler", st, stats.ServerHandleStart, stats.ServerHandleFinish, rpcSpan.Context())
rpcSpan.FinishWithOptions(opentracing.FinishOptions{FinishTime: st.GetEvent(stats.RPCFinish).Time()})
}
// serverOption return server option with specified tracer and operation name formater.
func serverOption(tracer opentracing.Tracer, formOperationName func(c context.Context) string) server.Option {
st := &serverTracer{}
st.tracer = tracer
st.formOperationName = formOperationName
return server.WithTracer(st)
}
func NewDefaultServerSuite() server.Suite {
return &serverSuite{opentracing.GlobalTracer(), func(ctx context.Context) string {
endpoint := rpcinfo.GetRPCInfo(ctx).From()
return endpoint.ServiceName() + "::" + endpoint.Method()
}}
}
func NewServerSuite(tracer opentracing.Tracer, formOperationName func(c context.Context) string) server.Suite {
return &serverSuite{tracer, formOperationName}
}
type serverSuite struct {
tracer opentracing.Tracer
formOperationName func(c context.Context) string
}
func (c *serverSuite) Options() []server.Option {
var options []server.Option
options = append(options, serverOption(c.tracer, c.formOperationName))
options = append(options, server.WithMiddleware(SpanContextExtractMW))
options = append(options, server.WithMetaHandler(transmeta.ServerTTHeaderHandler))
return options
}