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proxy.go
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proxy.go
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package proxy
import (
"crypto/tls"
"fmt"
"net"
"sync"
"github.com/grepplabs/kafka-proxy/config"
"github.com/grepplabs/kafka-proxy/pkg/libs/util"
"github.com/sirupsen/logrus"
)
type ListenFunc func(cfg config.ListenerConfig) (l net.Listener, err error)
type Listeners struct {
// Source of new connections to Kafka broker.
connSrc chan Conn
// listen IP for dynamically start
defaultListenerIP string
// advertised address for dynamic listeners
dynamicAdvertisedListener string
// socket TCP options
tcpConnOptions TCPConnOptions
listenFunc ListenFunc
disableDynamicListeners bool
dynamicSequentialMinPort int
brokerToListenerConfig map[string]config.ListenerConfig
lock sync.RWMutex
}
func NewListeners(cfg *config.Config) (*Listeners, error) {
defaultListenerIP := cfg.Proxy.DefaultListenerIP
dynamicAdvertisedListener := cfg.Proxy.DynamicAdvertisedListener
tcpConnOptions := TCPConnOptions{
KeepAlive: cfg.Proxy.ListenerKeepAlive,
ReadBufferSize: cfg.Proxy.ListenerReadBufferSize,
WriteBufferSize: cfg.Proxy.ListenerWriteBufferSize,
}
var tlsConfig *tls.Config
if cfg.Proxy.TLS.Enable {
var err error
tlsConfig, err = newTLSListenerConfig(cfg)
if err != nil {
return nil, err
}
}
listenFunc := func(cfg config.ListenerConfig) (net.Listener, error) {
if tlsConfig != nil {
return tls.Listen("tcp", cfg.ListenerAddress, tlsConfig)
}
return net.Listen("tcp", cfg.ListenerAddress)
}
brokerToListenerConfig, err := getBrokerToListenerConfig(cfg)
if err != nil {
return nil, err
}
return &Listeners{
defaultListenerIP: defaultListenerIP,
dynamicAdvertisedListener: dynamicAdvertisedListener,
connSrc: make(chan Conn, 1),
brokerToListenerConfig: brokerToListenerConfig,
tcpConnOptions: tcpConnOptions,
listenFunc: listenFunc,
disableDynamicListeners: cfg.Proxy.DisableDynamicListeners,
dynamicSequentialMinPort: cfg.Proxy.DynamicSequentialMinPort,
}, nil
}
func getBrokerToListenerConfig(cfg *config.Config) (map[string]config.ListenerConfig, error) {
brokerToListenerConfig := make(map[string]config.ListenerConfig)
for _, v := range cfg.Proxy.BootstrapServers {
if lc, ok := brokerToListenerConfig[v.BrokerAddress]; ok {
if lc.ListenerAddress != v.ListenerAddress || lc.AdvertisedAddress != v.AdvertisedAddress {
return nil, fmt.Errorf("bootstrap server mapping %s configured twice: %v and %v", v.BrokerAddress, v, lc)
}
continue
}
logrus.Infof("Bootstrap server %s advertised as %s", v.BrokerAddress, v.AdvertisedAddress)
brokerToListenerConfig[v.BrokerAddress] = v
}
externalToListenerConfig := make(map[string]config.ListenerConfig)
for _, v := range cfg.Proxy.ExternalServers {
if lc, ok := externalToListenerConfig[v.BrokerAddress]; ok {
if lc.ListenerAddress != v.ListenerAddress {
return nil, fmt.Errorf("external server mapping %s configured twice: %s and %v", v.BrokerAddress, v.ListenerAddress, lc)
}
continue
}
if v.ListenerAddress != v.AdvertisedAddress {
return nil, fmt.Errorf("external server mapping has different listener and advertised addresses %v", v)
}
externalToListenerConfig[v.BrokerAddress] = v
}
for _, v := range externalToListenerConfig {
if lc, ok := brokerToListenerConfig[v.BrokerAddress]; ok {
if lc.AdvertisedAddress != v.AdvertisedAddress {
return nil, fmt.Errorf("bootstrap and external server mappings %s with different advertised addresses: %v and %v", v.BrokerAddress, v.ListenerAddress, lc.AdvertisedAddress)
}
continue
}
logrus.Infof("External server %s advertised as %s", v.BrokerAddress, v.AdvertisedAddress)
brokerToListenerConfig[v.BrokerAddress] = v
}
return brokerToListenerConfig, nil
}
func (p *Listeners) GetNetAddressMapping(brokerHost string, brokerPort int32) (listenerHost string, listenerPort int32, err error) {
if brokerHost == "" || brokerPort <= 0 {
return "", 0, fmt.Errorf("broker address '%s:%d' is invalid", brokerHost, brokerPort)
}
brokerAddress := net.JoinHostPort(brokerHost, fmt.Sprint(brokerPort))
p.lock.RLock()
listenerConfig, ok := p.brokerToListenerConfig[brokerAddress]
p.lock.RUnlock()
if ok {
logrus.Debugf("Address mappings broker=%s, listener=%s, advertised=%s", listenerConfig.BrokerAddress, listenerConfig.ListenerAddress, listenerConfig.AdvertisedAddress)
return util.SplitHostPort(listenerConfig.AdvertisedAddress)
}
if !p.disableDynamicListeners {
logrus.Infof("Starting dynamic listener for broker %s", brokerAddress)
return p.ListenDynamicInstance(brokerAddress)
}
return "", 0, fmt.Errorf("net address mapping for %s:%d was not found", brokerHost, brokerPort)
}
func (p *Listeners) ListenDynamicInstance(brokerAddress string) (string, int32, error) {
p.lock.Lock()
defer p.lock.Unlock()
// double check
if v, ok := p.brokerToListenerConfig[brokerAddress]; ok {
return util.SplitHostPort(v.AdvertisedAddress)
}
defaultListenerAddress := net.JoinHostPort(p.defaultListenerIP, fmt.Sprint(p.dynamicSequentialMinPort))
if p.dynamicSequentialMinPort != 0 {
p.dynamicSequentialMinPort += 1
}
cfg := config.ListenerConfig{ListenerAddress: defaultListenerAddress, BrokerAddress: brokerAddress}
l, err := listenInstance(p.connSrc, cfg, p.tcpConnOptions, p.listenFunc)
if err != nil {
return "", 0, err
}
port := l.Addr().(*net.TCPAddr).Port
address := net.JoinHostPort(p.defaultListenerIP, fmt.Sprint(port))
dynamicAdvertisedListener := p.dynamicAdvertisedListener
if dynamicAdvertisedListener == "" {
dynamicAdvertisedListener = p.defaultListenerIP
}
advertisedAddress := net.JoinHostPort(dynamicAdvertisedListener, fmt.Sprint(port))
p.brokerToListenerConfig[brokerAddress] = config.ListenerConfig{BrokerAddress: brokerAddress, ListenerAddress: address, AdvertisedAddress: advertisedAddress}
logrus.Infof("Dynamic listener %s for broker %s advertised as %s", address, brokerAddress, advertisedAddress)
return dynamicAdvertisedListener, int32(port), nil
}
func (p *Listeners) ListenInstances(cfgs []config.ListenerConfig) (<-chan Conn, error) {
p.lock.Lock()
defer p.lock.Unlock()
// allows multiple local addresses to point to the remote
for _, v := range cfgs {
_, err := listenInstance(p.connSrc, v, p.tcpConnOptions, p.listenFunc)
if err != nil {
return nil, err
}
}
return p.connSrc, nil
}
func listenInstance(dst chan<- Conn, cfg config.ListenerConfig, opts TCPConnOptions, listenFunc ListenFunc) (net.Listener, error) {
l, err := listenFunc(cfg)
if err != nil {
return nil, err
}
go withRecover(func() {
for {
c, err := l.Accept()
if err != nil {
logrus.Infof("Error in accept for %q on %v: %v", cfg, cfg.ListenerAddress, err)
l.Close()
return
}
if tcpConn, ok := c.(*net.TCPConn); ok {
if err := opts.setTCPConnOptions(tcpConn); err != nil {
logrus.Infof("WARNING: Error while setting TCP options for accepted connection %q on %v: %v", cfg, l.Addr().String(), err)
}
}
logrus.Infof("New connection for %s", cfg.BrokerAddress)
dst <- Conn{BrokerAddress: cfg.BrokerAddress, LocalConnection: c}
}
})
logrus.Infof("Listening on %s (%s) for remote %s", cfg.ListenerAddress, l.Addr().String(), cfg.BrokerAddress)
return l, nil
}