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proxyclient.go
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proxyclient.go
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// Copyright 2015-2018 trivago N.V.
//
// 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 consumer
import (
"github.com/sirupsen/logrus"
"github.com/trivago/gollum/core"
"github.com/trivago/tgo"
"github.com/trivago/tgo/tio"
"io"
"net"
"syscall"
"time"
)
const (
proxyClientBufferGrowSize = 256
)
type proxyClient struct {
core.AsyncMessageSource
proxy *Proxy
conn net.Conn
connected bool
logger logrus.FieldLogger
}
func listenToProxyClient(conn net.Conn, proxy *Proxy) {
defer tgo.RecoverShutdown()
defer conn.Close()
conn.SetDeadline(time.Time{})
client := proxyClient{
proxy: proxy,
conn: conn,
connected: true,
logger: proxy.Logger,
}
client.read()
}
func (client *proxyClient) hasDisconnected(err error) bool {
netErr, isNetErr := err.(*net.OpError)
if isNetErr {
errno, isErrno := netErr.Err.(syscall.Errno)
if isErrno {
switch errno {
default:
case syscall.ECONNRESET:
return true // ### return, close connection ###
}
}
}
return false
}
func (client *proxyClient) EnqueueResponse(msg core.Message) {
_, err := client.conn.Write(msg.GetPayload())
if err != nil && err != io.EOF {
if client.hasDisconnected(err) {
client.connected = false // ### return, connection closed ###
}
client.logger.Error("Write failed: ", err)
}
}
func (client *proxyClient) sendMessage(data []byte) {
client.proxy.Enqueue(data)
}
func (client *proxyClient) read() {
buffer := tio.NewBufferedReader(proxyClientBufferGrowSize, client.proxy.flags, client.proxy.offset, client.proxy.delimiter)
for client.proxy.IsActive() && client.connected {
err := buffer.ReadAll(client.conn, client.sendMessage)
// Handle read errors
if err != nil && err != io.EOF {
if client.hasDisconnected(err) {
return // ### return, connection closed ###
}
client.logger.Error("Read failed: ", err)
}
}
}