/
message_receiver.go
98 lines (83 loc) · 2.33 KB
/
message_receiver.go
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/*
* Copyright 2020 The Knative 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 kncloudevents
import (
"context"
"fmt"
"net"
nethttp "net/http"
"time"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/plugin/ochttp/propagation/tracecontext"
)
const (
DefaultShutdownTimeout = time.Minute * 1
)
type HttpMessageReceiver struct {
port int
handler nethttp.Handler
server *nethttp.Server
listener net.Listener
}
func NewHttpMessageReceiver(port int) *HttpMessageReceiver {
return &HttpMessageReceiver{
port: port,
}
}
// Blocking
func (recv *HttpMessageReceiver) StartListen(ctx context.Context, handler nethttp.Handler) error {
var err error
if recv.listener, err = net.Listen("tcp", fmt.Sprintf(":%d", recv.port)); err != nil {
return err
}
recv.handler = CreateHandler(handler)
recv.server = &nethttp.Server{
Addr: recv.listener.Addr().String(),
Handler: recv.handler,
}
errChan := make(chan error, 1)
go func() {
errChan <- recv.server.Serve(recv.listener)
}()
// wait for the server to return or ctx.Done().
select {
case <-ctx.Done():
ctx, cancel := context.WithTimeout(context.Background(), getShutdownTimeout(ctx))
defer cancel()
err := recv.server.Shutdown(ctx)
<-errChan // Wait for server goroutine to exit
return err
case err := <-errChan:
return err
}
}
type shutdownTimeoutKey struct{}
func getShutdownTimeout(ctx context.Context) time.Duration {
v := ctx.Value(shutdownTimeoutKey{})
if v == nil {
return DefaultShutdownTimeout
}
return v.(time.Duration)
}
func WithShutdownTimeout(ctx context.Context, timeout time.Duration) context.Context {
return context.WithValue(ctx, shutdownTimeoutKey{}, timeout)
}
func CreateHandler(handler nethttp.Handler) nethttp.Handler {
return &ochttp.Handler{
Propagation: &tracecontext.HTTPFormat{},
Handler: handler,
}
}