forked from influxdata/influxdb
/
protobuf_server.go
157 lines (136 loc) · 3.99 KB
/
protobuf_server.go
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package coordinator
import (
"bytes"
"encoding/binary"
"io"
"io/ioutil"
"net"
"sync"
"time"
log "code.google.com/p/log4go"
"github.com/influxdb/influxdb/protocol"
)
type ProtobufServer struct {
listener net.Listener
port string
requestHandler RequestHandler
connectionMapLock sync.Mutex
connectionMap map[net.Conn]bool
}
const KILOBYTE = 1024
const MEGABYTE = 1024 * KILOBYTE
const MAX_REQUEST_SIZE = MEGABYTE * 2
func NewProtobufServer(port string, requestHandler RequestHandler) *ProtobufServer {
server := &ProtobufServer{port: port, requestHandler: requestHandler, connectionMap: make(map[net.Conn]bool)}
return server
}
func (self *ProtobufServer) Close() {
self.listener.Close()
self.connectionMapLock.Lock()
defer self.connectionMapLock.Unlock()
for conn := range self.connectionMap {
conn.Close()
}
// loop while the port is still accepting connections
for {
_, port, _ := net.SplitHostPort(self.port)
conn, err := net.Dial("tcp", "localhost:"+port)
if err != nil {
log.Error("Received error %s, assuming connection is closed.", err)
break
}
conn.Close()
log.Info("Waiting while the server port is closing")
time.Sleep(1 * time.Second)
}
}
func (self *ProtobufServer) ListenAndServe() {
ln, err := net.Listen("tcp", self.port)
if err != nil {
panic(err)
}
self.listener = ln
log.Info("ProtobufServer listening on %s", self.port)
for {
conn, err := ln.Accept()
if err != nil {
log.Error("Error with TCP connection. Assuming server is closing: %s", err)
break
}
self.connectionMapLock.Lock()
self.connectionMap[conn] = true
self.connectionMapLock.Unlock()
go self.handleConnection(conn)
}
}
func (self *ProtobufServer) handleConnection(conn net.Conn) {
log.Info("ProtobufServer: client connected: %s", conn.RemoteAddr().String())
message := make([]byte, 0, MAX_REQUEST_SIZE)
buff := bytes.NewBuffer(message)
var messageSizeU uint32
for {
err := binary.Read(conn, binary.LittleEndian, &messageSizeU)
if err != nil {
log.Error("Error reading from connection (%s): %s", conn.RemoteAddr().String(), err)
self.connectionMapLock.Lock()
delete(self.connectionMap, conn)
self.connectionMapLock.Unlock()
conn.Close()
return
}
messageSize := int64(messageSizeU)
if messageSize > MAX_REQUEST_SIZE {
err = self.handleRequestTooLarge(conn, messageSize)
} else {
err = self.handleRequest(conn, messageSize, buff)
}
if err != nil {
log.Error("Error, closing connection: %s", err)
self.connectionMapLock.Lock()
delete(self.connectionMap, conn)
self.connectionMapLock.Unlock()
conn.Close()
return
}
buff.Reset()
}
}
func (self *ProtobufServer) handleRequest(conn net.Conn, messageSize int64, buff *bytes.Buffer) error {
reader := io.LimitReader(conn, messageSize)
_, err := io.Copy(buff, reader)
if err != nil {
return err
}
request, err := protocol.DecodeRequest(buff)
if err != nil {
return err
}
log.Debug("Received %s request: %d", request.GetType(), request.GetRequestNumber())
return self.requestHandler.HandleRequest(request, conn)
}
func (self *ProtobufServer) handleRequestTooLarge(conn net.Conn, messageSize int64) error {
log.Error("request too large, dumping: %s (%d)", conn.RemoteAddr().String(), messageSize)
for messageSize > 0 {
reader := io.LimitReader(conn, MAX_REQUEST_SIZE)
_, err := io.Copy(ioutil.Discard, reader)
if err != nil {
return err
}
messageSize -= MAX_REQUEST_SIZE
}
return self.sendErrorResponse(conn, protocol.Response_REQUEST_TOO_LARGE, "request too large")
}
func (self *ProtobufServer) sendErrorResponse(conn net.Conn, code protocol.Response_ErrorCode, message string) error {
response := &protocol.Response{ErrorCode: &code, ErrorMessage: &message}
data, err := response.Encode()
if err != nil {
return err
}
buff := bytes.NewBuffer(make([]byte, 0, len(data)+4))
err = binary.Write(buff, binary.LittleEndian, uint32(len(data)))
if err != nil {
return err
}
_, err = conn.Write(append(buff.Bytes(), data...))
return err
}