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Beego/pkg/web/filter/opentracing/filter.go
2020-08-11 03:23:38 +00:00

88 lines
3.0 KiB
Go

// Copyright 2020 beego
//
// 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"
logKit "github.com/go-kit/kit/log"
opentracingKit "github.com/go-kit/kit/tracing/opentracing"
"github.com/opentracing/opentracing-go"
beego "github.com/astaxie/beego/pkg"
beegoCtx "github.com/astaxie/beego/pkg/context"
)
// FilterChainBuilder provides an extension point that we can support more configurations if necessary
type FilterChainBuilder struct {
// CustomSpanFunc makes users to custom the span.
CustomSpanFunc func(span opentracing.Span, ctx *beegoCtx.Context)
}
func (builder *FilterChainBuilder) FilterChain(next beego.FilterFunc) beego.FilterFunc {
return func(ctx *beegoCtx.Context) {
var (
spanCtx context.Context
span opentracing.Span
)
operationName := builder.operationName(ctx)
if preSpan := opentracing.SpanFromContext(ctx.Request.Context()); preSpan == nil {
inject := opentracingKit.HTTPToContext(opentracing.GlobalTracer(), operationName, logKit.NewNopLogger())
spanCtx = inject(ctx.Request.Context(), ctx.Request)
span = opentracing.SpanFromContext(spanCtx)
} else {
span, spanCtx = opentracing.StartSpanFromContext(ctx.Request.Context(), operationName)
}
defer span.Finish()
newReq := ctx.Request.Clone(spanCtx)
ctx.Reset(ctx.ResponseWriter.ResponseWriter, newReq)
next(ctx)
// if you think we need to do more things, feel free to create an issue to tell us
span.SetTag("http.status_code", ctx.ResponseWriter.Status)
span.SetTag("http.method", ctx.Input.Method())
span.SetTag("peer.hostname", ctx.Request.Host)
span.SetTag("http.url", ctx.Request.URL.String())
span.SetTag("http.scheme", ctx.Request.URL.Scheme)
span.SetTag("span.kind", "server")
span.SetTag("component", "beego")
if ctx.Output.IsServerError() || ctx.Output.IsClientError() {
span.SetTag("error", true)
}
span.SetTag("peer.address", ctx.Request.RemoteAddr)
span.SetTag("http.proto", ctx.Request.Proto)
span.SetTag("beego.route", ctx.Input.GetData("RouterPattern"))
if builder.CustomSpanFunc != nil {
builder.CustomSpanFunc(span, ctx)
}
}
}
func (builder *FilterChainBuilder) operationName(ctx *beegoCtx.Context) string {
operationName := ctx.Input.URL()
// it means that there is not any span, so we create a span as the root span.
// TODO, if we support multiple servers, this need to be changed
route, found := beego.BeeApp.Handlers.FindRouter(ctx)
if found {
operationName = ctx.Input.Method() + "#" + route.GetPattern()
}
return operationName
}