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Merge pull request #218 from slingamn/socketwriter.1

refactor irc.Socket
This commit is contained in:
Shivaram Lingamneni 2018-03-28 13:26:03 -04:00 committed by GitHub
commit 7cfa75a59e
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6 changed files with 90 additions and 125 deletions

View File

@ -87,7 +87,9 @@ type Client struct {
// NewClient returns a client with all the appropriate info setup.
func NewClient(server *Server, conn net.Conn, isTLS bool) *Client {
now := time.Now()
socket := NewSocket(conn, server.MaxSendQBytes)
limits := server.Limits()
fullLineLenLimit := limits.LineLen.Tags + limits.LineLen.Rest
socket := NewSocket(conn, fullLineLenLimit*2, server.MaxSendQBytes())
go socket.RunSocketWriter()
client := &Client{
atime: now,
@ -253,7 +255,11 @@ func (client *Client) run() {
line, err = client.socket.Read()
if err != nil {
client.Quit("connection closed")
quitMessage := "connection closed"
if err == errReadQ {
quitMessage = "readQ exceeded"
}
client.Quit(quitMessage)
break
}

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@ -216,7 +216,7 @@ type Config struct {
ProxyAllowedFrom []string `yaml:"proxy-allowed-from"`
WebIRC []webircConfig `yaml:"webirc"`
MaxSendQString string `yaml:"max-sendq"`
MaxSendQBytes uint64
MaxSendQBytes int
ConnectionLimiter connection_limits.LimiterConfig `yaml:"connection-limits"`
ConnectionThrottler connection_limits.ThrottlerConfig `yaml:"connection-throttling"`
}
@ -530,10 +530,11 @@ func LoadConfig(filename string) (config *Config, err error) {
}
}
config.Server.MaxSendQBytes, err = bytefmt.ToBytes(config.Server.MaxSendQString)
maxSendQBytes, err := bytefmt.ToBytes(config.Server.MaxSendQString)
if err != nil {
return nil, fmt.Errorf("Could not parse maximum SendQ size (make sure it only contains whole numbers): %s", err.Error())
}
config.Server.MaxSendQBytes = int(maxSendQBytes)
// get language files
config.Languages.Data = make(map[string]languages.LangData)

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@ -40,6 +40,7 @@ var (
var (
errNoPeerCerts = errors.New("Client did not provide a certificate")
errNotTLS = errors.New("Not a TLS connection")
errReadQ = errors.New("ReadQ Exceeded")
)
// String Errors

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@ -6,8 +6,17 @@ package irc
import (
"github.com/oragono/oragono/irc/isupport"
"github.com/oragono/oragono/irc/modes"
"sync/atomic"
)
func (server *Server) MaxSendQBytes() int {
return int(atomic.LoadUint32(&server.maxSendQBytes))
}
func (server *Server) SetMaxSendQBytes(m int) {
atomic.StoreUint32(&server.maxSendQBytes, uint32(m))
}
func (server *Server) ISupport() *isupport.List {
server.configurableStateMutex.RLock()
defer server.configurableStateMutex.RUnlock()

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@ -109,7 +109,7 @@ type Server struct {
limits Limits
listeners map[string]*ListenerWrapper
logger *logger.Manager
MaxSendQBytes uint64
maxSendQBytes uint32
monitorManager *MonitorManager
motdLines []string
name string
@ -928,16 +928,7 @@ func (server *Server) applyConfig(config *Config, initial bool) error {
server.configurableStateMutex.Unlock()
// set new sendqueue size
if config.Server.MaxSendQBytes != server.MaxSendQBytes {
server.configurableStateMutex.Lock()
server.MaxSendQBytes = config.Server.MaxSendQBytes
server.configurableStateMutex.Unlock()
// update on all clients
for _, sClient := range server.clients.AllClients() {
sClient.socket.MaxSendQBytes = config.Server.MaxSendQBytes
}
}
server.SetMaxSendQBytes(config.Server.MaxSendQBytes)
server.loadMOTD(config.Server.MOTD, config.Server.MOTDFormatting)

View File

@ -9,6 +9,7 @@ import (
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"errors"
"io"
"net"
"strings"
@ -18,47 +19,44 @@ import (
var (
handshakeTimeout, _ = time.ParseDuration("5s")
errSendQExceeded = errors.New("SendQ exceeded")
)
// Socket represents an IRC socket.
type Socket struct {
sync.Mutex
conn net.Conn
reader *bufio.Reader
MaxSendQBytes uint64
closed bool
closedMutex sync.Mutex
finalData string // what to send when we die
finalDataMutex sync.Mutex
maxSendQBytes int
// coordination system for asynchronous writes
buffer []byte
lineToSendExists chan bool
linesToSend []string
linesToSendMutex sync.Mutex
closed bool
sendQExceeded bool
finalData string // what to send when we die
}
// NewSocket returns a new Socket.
func NewSocket(conn net.Conn, maxSendQBytes uint64) Socket {
func NewSocket(conn net.Conn, maxReadQBytes int, maxSendQBytes int) Socket {
return Socket{
conn: conn,
reader: bufio.NewReader(conn),
MaxSendQBytes: maxSendQBytes,
lineToSendExists: make(chan bool),
reader: bufio.NewReaderSize(conn, maxReadQBytes),
maxSendQBytes: maxSendQBytes,
lineToSendExists: make(chan bool, 1),
}
}
// Close stops a Socket from being able to send/receive any more data.
func (socket *Socket) Close() {
socket.closedMutex.Lock()
defer socket.closedMutex.Unlock()
if socket.closed {
return
}
socket.Lock()
socket.closed = true
socket.Unlock()
// force close loop to happen if it hasn't already
go socket.timedFillLineToSendExists(200 * time.Millisecond)
socket.wakeWriter()
}
// CertFP returns the fingerprint of the certificate provided by the client.
@ -94,10 +92,13 @@ func (socket *Socket) Read() (string, error) {
return "", io.EOF
}
lineBytes, err := socket.reader.ReadBytes('\n')
lineBytes, isPrefix, err := socket.reader.ReadLine()
if isPrefix {
return "", errReadQ
}
// convert bytes to string
line := string(lineBytes[:])
line := string(lineBytes)
// read last message properly (such as ERROR/QUIT/etc), just fail next reads/writes
if err == io.EOF {
@ -110,128 +111,84 @@ func (socket *Socket) Read() (string, error) {
return "", err
}
return strings.TrimRight(line, "\r\n"), nil
return line, nil
}
// Write sends the given string out of Socket.
func (socket *Socket) Write(data string) error {
if socket.IsClosed() {
return io.EOF
func (socket *Socket) Write(data string) (err error) {
socket.Lock()
if socket.closed {
err = io.EOF
} else if len(data)+len(socket.buffer) > socket.maxSendQBytes {
socket.sendQExceeded = true
err = errSendQExceeded
} else {
socket.buffer = append(socket.buffer, data...)
}
socket.Unlock()
socket.linesToSendMutex.Lock()
socket.linesToSend = append(socket.linesToSend, data)
socket.linesToSendMutex.Unlock()
go socket.timedFillLineToSendExists(15 * time.Second)
return nil
socket.wakeWriter()
return
}
// timedFillLineToSendExists either sends the note or times out.
func (socket *Socket) timedFillLineToSendExists(duration time.Duration) {
lineToSendTimeout := time.NewTimer(duration)
defer lineToSendTimeout.Stop()
// wakeWriter wakes up the goroutine that actually performs the write, without blocking
func (socket *Socket) wakeWriter() {
// nonblocking send to the channel, no-op if it's full
select {
case socket.lineToSendExists <- true:
// passed data successfully
case <-lineToSendTimeout.C:
// timed out send
default:
}
}
// SetFinalData sets the final data to send when the SocketWriter closes.
func (socket *Socket) SetFinalData(data string) {
socket.finalDataMutex.Lock()
socket.Lock()
defer socket.Unlock()
socket.finalData = data
socket.finalDataMutex.Unlock()
}
// IsClosed returns whether the socket is closed.
func (socket *Socket) IsClosed() bool {
socket.closedMutex.Lock()
defer socket.closedMutex.Unlock()
socket.Lock()
defer socket.Unlock()
return socket.closed
}
// RunSocketWriter starts writing messages to the outgoing socket.
func (socket *Socket) RunSocketWriter() {
for {
localBuffer := make([]byte, 0)
shouldStop := false
for !shouldStop {
// wait for new lines
select {
case <-socket.lineToSendExists:
socket.linesToSendMutex.Lock()
// retrieve the buffered data, clear the buffer
socket.Lock()
localBuffer = append(localBuffer, socket.buffer...)
socket.buffer = socket.buffer[:0]
socket.Unlock()
// check if we're closed
if socket.IsClosed() {
socket.linesToSendMutex.Unlock()
break
}
_, err := socket.conn.Write(localBuffer)
localBuffer = localBuffer[:0]
// check whether new lines actually exist or not
if len(socket.linesToSend) < 1 {
socket.linesToSendMutex.Unlock()
continue
}
// check sendq
var sendQBytes uint64
for _, line := range socket.linesToSend {
sendQBytes += uint64(len(line))
if socket.MaxSendQBytes < sendQBytes {
// don't unlock mutex because this break is just to escape this for loop
break
}
}
if socket.MaxSendQBytes < sendQBytes {
socket.SetFinalData("\r\nERROR :SendQ Exceeded\r\n")
socket.linesToSendMutex.Unlock()
break
}
// get all existing data
data := strings.Join(socket.linesToSend, "")
socket.linesToSend = []string{}
socket.linesToSendMutex.Unlock()
// write data
if 0 < len(data) {
_, err := socket.conn.Write([]byte(data))
if err != nil {
break
}
}
}
if socket.IsClosed() {
// error out or we've been closed
break
socket.Lock()
shouldStop = (err != nil) || socket.closed || socket.sendQExceeded
socket.Unlock()
}
}
// force closure of socket
socket.closedMutex.Lock()
if !socket.closed {
socket.closed = true
}
socket.closedMutex.Unlock()
// write error lines
socket.finalDataMutex.Lock()
if 0 < len(socket.finalData) {
socket.conn.Write([]byte(socket.finalData))
// mark the socket closed (if someone hasn't already), then write error lines
socket.Lock()
socket.closed = true
finalData := socket.finalData
if socket.sendQExceeded {
finalData = "\r\nERROR :SendQ Exceeded\r\n"
}
socket.Unlock()
if finalData != "" {
socket.conn.Write([]byte(finalData))
}
socket.finalDataMutex.Unlock()
// close the connection
socket.conn.Close()
// empty the lineToSendExists channel
for 0 < len(socket.lineToSendExists) {
<-socket.lineToSendExists
}
}
// WriteLine writes the given line out of Socket.
func (socket *Socket) WriteLine(line string) error {
return socket.Write(line + "\r\n")
}