You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
526 lines
12 KiB
526 lines
12 KiB
package sarama
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"strconv"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
// Broker represents a single Kafka broker connection. All operations on this object are entirely concurrency-safe.
|
|
type Broker struct {
|
|
id int32
|
|
addr string
|
|
|
|
conf *Config
|
|
correlationID int32
|
|
conn net.Conn
|
|
connErr error
|
|
lock sync.Mutex
|
|
opened int32
|
|
|
|
responses chan responsePromise
|
|
done chan bool
|
|
}
|
|
|
|
type responsePromise struct {
|
|
correlationID int32
|
|
packets chan []byte
|
|
errors chan error
|
|
}
|
|
|
|
// NewBroker creates and returns a Broker targetting the given host:port address.
|
|
// This does not attempt to actually connect, you have to call Open() for that.
|
|
func NewBroker(addr string) *Broker {
|
|
return &Broker{id: -1, addr: addr}
|
|
}
|
|
|
|
// Open tries to connect to the Broker if it is not already connected or connecting, but does not block
|
|
// waiting for the connection to complete. This means that any subsequent operations on the broker will
|
|
// block waiting for the connection to succeed or fail. To get the effect of a fully synchronous Open call,
|
|
// follow it by a call to Connected(). The only errors Open will return directly are ConfigurationError or
|
|
// AlreadyConnected. If conf is nil, the result of NewConfig() is used.
|
|
func (b *Broker) Open(conf *Config) error {
|
|
if !atomic.CompareAndSwapInt32(&b.opened, 0, 1) {
|
|
return ErrAlreadyConnected
|
|
}
|
|
|
|
if conf == nil {
|
|
conf = NewConfig()
|
|
}
|
|
|
|
err := conf.Validate()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.lock.Lock()
|
|
|
|
go withRecover(func() {
|
|
defer b.lock.Unlock()
|
|
|
|
dialer := net.Dialer{
|
|
Timeout: conf.Net.DialTimeout,
|
|
KeepAlive: conf.Net.KeepAlive,
|
|
}
|
|
|
|
if conf.Net.TLS.Enable {
|
|
b.conn, b.connErr = tls.DialWithDialer(&dialer, "tcp", b.addr, conf.Net.TLS.Config)
|
|
} else {
|
|
b.conn, b.connErr = dialer.Dial("tcp", b.addr)
|
|
}
|
|
if b.connErr != nil {
|
|
Logger.Printf("Failed to connect to broker %s: %s\n", b.addr, b.connErr)
|
|
b.conn = nil
|
|
atomic.StoreInt32(&b.opened, 0)
|
|
return
|
|
}
|
|
b.conn = newBufConn(b.conn)
|
|
|
|
b.conf = conf
|
|
|
|
if conf.Net.SASL.Enable {
|
|
b.connErr = b.sendAndReceiveSASLPlainAuth()
|
|
if b.connErr != nil {
|
|
err = b.conn.Close()
|
|
if err == nil {
|
|
Logger.Printf("Closed connection to broker %s\n", b.addr)
|
|
} else {
|
|
Logger.Printf("Error while closing connection to broker %s: %s\n", b.addr, err)
|
|
}
|
|
b.conn = nil
|
|
atomic.StoreInt32(&b.opened, 0)
|
|
return
|
|
}
|
|
}
|
|
|
|
b.done = make(chan bool)
|
|
b.responses = make(chan responsePromise, b.conf.Net.MaxOpenRequests-1)
|
|
|
|
if b.id >= 0 {
|
|
Logger.Printf("Connected to broker at %s (registered as #%d)\n", b.addr, b.id)
|
|
} else {
|
|
Logger.Printf("Connected to broker at %s (unregistered)\n", b.addr)
|
|
}
|
|
go withRecover(b.responseReceiver)
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
// Connected returns true if the broker is connected and false otherwise. If the broker is not
|
|
// connected but it had tried to connect, the error from that connection attempt is also returned.
|
|
func (b *Broker) Connected() (bool, error) {
|
|
b.lock.Lock()
|
|
defer b.lock.Unlock()
|
|
|
|
return b.conn != nil, b.connErr
|
|
}
|
|
|
|
func (b *Broker) Close() error {
|
|
b.lock.Lock()
|
|
defer b.lock.Unlock()
|
|
|
|
if b.conn == nil {
|
|
return ErrNotConnected
|
|
}
|
|
|
|
close(b.responses)
|
|
<-b.done
|
|
|
|
err := b.conn.Close()
|
|
|
|
b.conn = nil
|
|
b.connErr = nil
|
|
b.done = nil
|
|
b.responses = nil
|
|
|
|
if err == nil {
|
|
Logger.Printf("Closed connection to broker %s\n", b.addr)
|
|
} else {
|
|
Logger.Printf("Error while closing connection to broker %s: %s\n", b.addr, err)
|
|
}
|
|
|
|
atomic.StoreInt32(&b.opened, 0)
|
|
|
|
return err
|
|
}
|
|
|
|
// ID returns the broker ID retrieved from Kafka's metadata, or -1 if that is not known.
|
|
func (b *Broker) ID() int32 {
|
|
return b.id
|
|
}
|
|
|
|
// Addr returns the broker address as either retrieved from Kafka's metadata or passed to NewBroker.
|
|
func (b *Broker) Addr() string {
|
|
return b.addr
|
|
}
|
|
|
|
func (b *Broker) GetMetadata(request *MetadataRequest) (*MetadataResponse, error) {
|
|
response := new(MetadataResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) GetConsumerMetadata(request *ConsumerMetadataRequest) (*ConsumerMetadataResponse, error) {
|
|
response := new(ConsumerMetadataResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) GetAvailableOffsets(request *OffsetRequest) (*OffsetResponse, error) {
|
|
response := new(OffsetResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) Produce(request *ProduceRequest) (*ProduceResponse, error) {
|
|
var response *ProduceResponse
|
|
var err error
|
|
|
|
if request.RequiredAcks == NoResponse {
|
|
err = b.sendAndReceive(request, nil)
|
|
} else {
|
|
response = new(ProduceResponse)
|
|
err = b.sendAndReceive(request, response)
|
|
}
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) Fetch(request *FetchRequest) (*FetchResponse, error) {
|
|
response := new(FetchResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) CommitOffset(request *OffsetCommitRequest) (*OffsetCommitResponse, error) {
|
|
response := new(OffsetCommitResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) FetchOffset(request *OffsetFetchRequest) (*OffsetFetchResponse, error) {
|
|
response := new(OffsetFetchResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) JoinGroup(request *JoinGroupRequest) (*JoinGroupResponse, error) {
|
|
response := new(JoinGroupResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) SyncGroup(request *SyncGroupRequest) (*SyncGroupResponse, error) {
|
|
response := new(SyncGroupResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) LeaveGroup(request *LeaveGroupRequest) (*LeaveGroupResponse, error) {
|
|
response := new(LeaveGroupResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) Heartbeat(request *HeartbeatRequest) (*HeartbeatResponse, error) {
|
|
response := new(HeartbeatResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) ListGroups(request *ListGroupsRequest) (*ListGroupsResponse, error) {
|
|
response := new(ListGroupsResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) DescribeGroups(request *DescribeGroupsRequest) (*DescribeGroupsResponse, error) {
|
|
response := new(DescribeGroupsResponse)
|
|
|
|
err := b.sendAndReceive(request, response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return response, nil
|
|
}
|
|
|
|
func (b *Broker) send(rb protocolBody, promiseResponse bool) (*responsePromise, error) {
|
|
b.lock.Lock()
|
|
defer b.lock.Unlock()
|
|
|
|
if b.conn == nil {
|
|
if b.connErr != nil {
|
|
return nil, b.connErr
|
|
}
|
|
return nil, ErrNotConnected
|
|
}
|
|
|
|
if !b.conf.Version.IsAtLeast(rb.requiredVersion()) {
|
|
return nil, ErrUnsupportedVersion
|
|
}
|
|
|
|
req := &request{correlationID: b.correlationID, clientID: b.conf.ClientID, body: rb}
|
|
buf, err := encode(req)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = b.conn.SetWriteDeadline(time.Now().Add(b.conf.Net.WriteTimeout))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
_, err = b.conn.Write(buf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
b.correlationID++
|
|
|
|
if !promiseResponse {
|
|
return nil, nil
|
|
}
|
|
|
|
promise := responsePromise{req.correlationID, make(chan []byte), make(chan error)}
|
|
b.responses <- promise
|
|
|
|
return &promise, nil
|
|
}
|
|
|
|
func (b *Broker) sendAndReceive(req protocolBody, res versionedDecoder) error {
|
|
promise, err := b.send(req, res != nil)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if promise == nil {
|
|
return nil
|
|
}
|
|
|
|
select {
|
|
case buf := <-promise.packets:
|
|
return versionedDecode(buf, res, req.version())
|
|
case err = <-promise.errors:
|
|
return err
|
|
}
|
|
}
|
|
|
|
func (b *Broker) decode(pd packetDecoder) (err error) {
|
|
b.id, err = pd.getInt32()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
host, err := pd.getString()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
port, err := pd.getInt32()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.addr = net.JoinHostPort(host, fmt.Sprint(port))
|
|
if _, _, err := net.SplitHostPort(b.addr); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (b *Broker) encode(pe packetEncoder) (err error) {
|
|
|
|
host, portstr, err := net.SplitHostPort(b.addr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
port, err := strconv.Atoi(portstr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pe.putInt32(b.id)
|
|
|
|
err = pe.putString(host)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pe.putInt32(int32(port))
|
|
|
|
return nil
|
|
}
|
|
|
|
func (b *Broker) responseReceiver() {
|
|
var dead error
|
|
header := make([]byte, 8)
|
|
for response := range b.responses {
|
|
if dead != nil {
|
|
response.errors <- dead
|
|
continue
|
|
}
|
|
|
|
err := b.conn.SetReadDeadline(time.Now().Add(b.conf.Net.ReadTimeout))
|
|
if err != nil {
|
|
dead = err
|
|
response.errors <- err
|
|
continue
|
|
}
|
|
|
|
_, err = io.ReadFull(b.conn, header)
|
|
if err != nil {
|
|
dead = err
|
|
response.errors <- err
|
|
continue
|
|
}
|
|
|
|
decodedHeader := responseHeader{}
|
|
err = decode(header, &decodedHeader)
|
|
if err != nil {
|
|
dead = err
|
|
response.errors <- err
|
|
continue
|
|
}
|
|
if decodedHeader.correlationID != response.correlationID {
|
|
// TODO if decoded ID < cur ID, discard until we catch up
|
|
// TODO if decoded ID > cur ID, save it so when cur ID catches up we have a response
|
|
dead = PacketDecodingError{fmt.Sprintf("correlation ID didn't match, wanted %d, got %d", response.correlationID, decodedHeader.correlationID)}
|
|
response.errors <- dead
|
|
continue
|
|
}
|
|
|
|
buf := make([]byte, decodedHeader.length-4)
|
|
_, err = io.ReadFull(b.conn, buf)
|
|
if err != nil {
|
|
dead = err
|
|
response.errors <- err
|
|
continue
|
|
}
|
|
|
|
response.packets <- buf
|
|
}
|
|
close(b.done)
|
|
}
|
|
|
|
// Kafka 0.10.0 plans to support SASL Plain and Kerberos as per PR #812 (KIP-43)/(JIRA KAFKA-3149)
|
|
// Some hosted kafka services such as IBM Message Hub already offer SASL/PLAIN auth with Kafka 0.9
|
|
//
|
|
// In SASL Plain, Kafka expects the auth header to be in the following format
|
|
// Message format (from https://tools.ietf.org/html/rfc4616):
|
|
//
|
|
// message = [authzid] UTF8NUL authcid UTF8NUL passwd
|
|
// authcid = 1*SAFE ; MUST accept up to 255 octets
|
|
// authzid = 1*SAFE ; MUST accept up to 255 octets
|
|
// passwd = 1*SAFE ; MUST accept up to 255 octets
|
|
// UTF8NUL = %x00 ; UTF-8 encoded NUL character
|
|
//
|
|
// SAFE = UTF1 / UTF2 / UTF3 / UTF4
|
|
// ;; any UTF-8 encoded Unicode character except NUL
|
|
//
|
|
// When credentials are valid, Kafka returns a 4 byte array of null characters.
|
|
// When credentials are invalid, Kafka closes the connection. This does not seem to be the ideal way
|
|
// of responding to bad credentials but thats how its being done today.
|
|
func (b *Broker) sendAndReceiveSASLPlainAuth() error {
|
|
length := 1 + len(b.conf.Net.SASL.User) + 1 + len(b.conf.Net.SASL.Password)
|
|
authBytes := make([]byte, length+4) //4 byte length header + auth data
|
|
binary.BigEndian.PutUint32(authBytes, uint32(length))
|
|
copy(authBytes[4:], []byte("\x00"+b.conf.Net.SASL.User+"\x00"+b.conf.Net.SASL.Password))
|
|
|
|
err := b.conn.SetWriteDeadline(time.Now().Add(b.conf.Net.WriteTimeout))
|
|
if err != nil {
|
|
Logger.Printf("Failed to set write deadline when doing SASL auth with broker %s: %s\n", b.addr, err.Error())
|
|
return err
|
|
}
|
|
|
|
_, err = b.conn.Write(authBytes)
|
|
if err != nil {
|
|
Logger.Printf("Failed to write SASL auth header to broker %s: %s\n", b.addr, err.Error())
|
|
return err
|
|
}
|
|
|
|
header := make([]byte, 4)
|
|
n, err := io.ReadFull(b.conn, header)
|
|
// If the credentials are valid, we would get a 4 byte response filled with null characters.
|
|
// Otherwise, the broker closes the connection and we get an EOF
|
|
if err != nil {
|
|
Logger.Printf("Failed to read response while authenticating with SASL to broker %s: %s\n", b.addr, err.Error())
|
|
return err
|
|
}
|
|
|
|
Logger.Printf("SASL authentication successful with broker %s:%v - %v\n", b.addr, n, header)
|
|
return nil
|
|
}
|
|
|