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kafka.go
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/*
* Copyright (c) 2011 NeuStar, Inc.
* All rights reserved.
*
* 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.
*
* NeuStar, the Neustar logo and related names and logos are registered
* trademarks, service marks or tradenames of NeuStar, Inc. All other
* product names, company names, marks, logos and symbols may be trademarks
* of their respective owners.
*/
package kafka
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"log"
"net"
)
const (
// NETWORK constant for supported network protocol
NETWORK = "tcp"
)
// Broker contains the generic kafka parameters for a broker
type Broker struct {
topic string
partition int
hostname string
}
func newBroker(hostname string, topic string, partition int) *Broker {
return &Broker{
topic: topic,
partition: partition,
hostname: hostname,
}
}
func (b *Broker) connect() (conn *net.TCPConn, error error) {
raddr, err := net.ResolveTCPAddr(NETWORK, b.hostname)
if err != nil {
log.Println("Fatal Error: ", err)
return nil, err
}
conn, err = net.DialTCP(NETWORK, nil, raddr)
if err != nil {
log.Println("Fatal Error: ", err)
return nil, err
}
return conn, error
}
// returns length of response & payload & err
func (b *Broker) readResponse(conn *net.TCPConn) (uint32, []byte, error) {
reader := bufio.NewReader(conn)
length := make([]byte, 4)
lenRead, err := io.ReadFull(reader, length)
if err != nil {
return 0, []byte{}, err
}
if lenRead != 4 {
return 0, []byte{}, fmt.Errorf("invalid length of the packet length field (expected 4 bytes, got %d)", lenRead)
}
expectedLength := binary.BigEndian.Uint32(length)
messages := make([]byte, expectedLength)
lenRead, err = io.ReadFull(reader, messages)
if err != nil {
return 0, []byte{}, err
}
if uint32(lenRead) != expectedLength {
return 0, []byte{}, fmt.Errorf("Fatal Error: Unexpected Length: %d expected: %d", lenRead, expectedLength)
}
errorCode := binary.BigEndian.Uint16(messages[0:2])
if errorCode != 0 {
log.Println("errorCode: ", errorCode)
return 0, []byte{}, fmt.Errorf("Broker Response Error: %d", errorCode)
}
return expectedLength, messages[2:], nil
}