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propagation.go
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propagation.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package transport
import (
"context"
"time"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
opentracinglog "github.com/opentracing/opentracing-go/log"
)
// CreateOpenTracingSpan creates a new context with a started span
type CreateOpenTracingSpan struct {
Tracer opentracing.Tracer
TransportName string
StartTime time.Time
ExtraTags opentracing.Tags
}
// Do creates a new context that has a reference to the started span.
// This should be called before a Outbound makes a call
func (c *CreateOpenTracingSpan) Do(
ctx context.Context,
req *Request,
) (context.Context, opentracing.Span) {
var parent opentracing.SpanContext
if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
parent = parentSpan.Context()
}
tags := opentracing.Tags{
"rpc.caller": req.Caller,
"rpc.service": req.Service,
"rpc.encoding": req.Encoding,
"rpc.transport": c.TransportName,
}
for k, v := range c.ExtraTags {
tags[k] = v
}
span := c.Tracer.StartSpan(
req.Procedure,
opentracing.StartTime(c.StartTime),
opentracing.ChildOf(parent),
tags,
)
ext.PeerService.Set(span, req.Service)
ext.SpanKindRPCClient.Set(span)
ctx = opentracing.ContextWithSpan(ctx, span)
return ctx, span
}
// ExtractOpenTracingSpan derives a context and associated span
type ExtractOpenTracingSpan struct {
ParentSpanContext opentracing.SpanContext
Tracer opentracing.Tracer
TransportName string
StartTime time.Time
ExtraTags opentracing.Tags
}
// Do derives a new context from SpanContext. The created context has a
// reference to the started span. parentSpanCtx may be nil.
// This should be called before a Inbound handles a request
func (e *ExtractOpenTracingSpan) Do(
ctx context.Context,
req *Request,
) (context.Context, opentracing.Span) {
tags := opentracing.Tags{
"rpc.caller": req.Caller,
"rpc.service": req.Service,
"rpc.encoding": req.Encoding,
"rpc.transport": e.TransportName,
}
for k, v := range e.ExtraTags {
tags[k] = v
}
span := e.Tracer.StartSpan(
req.Procedure,
opentracing.StartTime(e.StartTime),
tags,
// parentSpanCtx may be nil
// this implies ChildOf
ext.RPCServerOption(e.ParentSpanContext),
)
ext.PeerService.Set(span, req.Caller)
ext.SpanKindRPCServer.Set(span)
ctx = opentracing.ContextWithSpan(ctx, span)
return ctx, span
}
// UpdateSpanWithErr sets the error tag on a span, if an error is given.
// Returns the given error
func UpdateSpanWithErr(span opentracing.Span, err error) error {
if err != nil {
span.SetTag("error", true)
span.LogFields(opentracinglog.String("event", err.Error()))
}
return err
}