/
behavior.go
101 lines (85 loc) · 3.22 KB
/
behavior.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 onewayctxpropagation
import (
"context"
"time"
"github.com/crossdock/crossdock-go"
opentracing "github.com/opentracing/opentracing-go"
"go.uber.org/yarpc"
"go.uber.org/yarpc/encoding/raw"
"go.uber.org/yarpc/internal/crossdock/client/dispatcher"
)
// Run starts the behavior, testing oneway context propagation
func Run(t crossdock.T) {
assert := crossdock.Assert(t)
fatals := crossdock.Fatals(t)
baggage := map[string]string{
"hello": "world",
"foo": "bar",
}
// create handler
callBackHandler, serverCalledBack := newCallBackHandler()
dispatcher, callBackAddr := dispatcher.CreateOnewayDispatcher(t, callBackHandler)
defer dispatcher.Stop()
client := raw.New(dispatcher.ClientConfig("oneway-server"))
// make call
ctx, cancel := context.WithTimeout(newContextWithBaggage(baggage), time.Second)
defer cancel()
ack, err := client.CallOneway(
ctx, "echo/raw", []byte{}, yarpc.WithHeader("callBackAddr", callBackAddr))
fatals.NoError(err, "call to oneway/raw failed: %v", err)
fatals.NotNil(ack, "ack is nil")
// wait for server to call us back
gotBaggage := <-serverCalledBack
assert.Equal(baggage, gotBaggage, "server baggage: %s", gotBaggage)
}
// newCallBackHandler creates a oneway handler that fills a channel
// with the received body
func newCallBackHandler() (raw.OnewayHandler, <-chan map[string]string) {
serverCalledBack := make(chan map[string]string)
return func(ctx context.Context, body []byte) error {
serverCalledBack <- extractBaggage(ctx)
return nil
}, serverCalledBack
}
func newContextWithBaggage(baggage map[string]string) context.Context {
span := opentracing.GlobalTracer().StartSpan("add baggage")
for k, v := range baggage {
span.SetBaggageItem(k, v)
}
return opentracing.ContextWithSpan(context.Background(), span)
}
func extractBaggage(ctx context.Context) map[string]string {
baggage := make(map[string]string)
span := opentracing.SpanFromContext(ctx)
if span == nil {
return baggage
}
spanContext := span.Context()
if spanContext == nil {
return baggage
}
spanContext.ForeachBaggageItem(func(k, v string) bool {
baggage[k] = v
return true
})
return baggage
}