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socket.go
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socket.go
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// Package socket provides a concise, powerful and high-performance TCP.
//
// Copyright 2017 HenryLee. 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.
//
package socket
import (
"fmt"
"io"
"net"
"sync"
"sync/atomic"
"time"
"github.com/henrylee2cn/goutil"
"github.com/henrylee2cn/goutil/errors"
)
type (
// Socket is a generic stream-oriented network connection.
//
// Multiple goroutines may invoke methods on a Socket simultaneously.
Socket interface {
// LocalAddr returns the local network address.
LocalAddr() net.Addr
// RemoteAddr returns the remote network address.
RemoteAddr() net.Addr
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail with a timeout (see type Error) instead of
// blocking. The deadline applies to all future and pending
// I/O, not just the immediately following call to Read or
// Write. After a deadline has been exceeded, the connection
// can be refreshed by setting a deadline in the future.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
SetDeadline(t time.Time) error
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
SetReadDeadline(t time.Time) error
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
SetWriteDeadline(t time.Time) error
// WritePacket writes header and body to the connection.
// Note: must be safe for concurrent use by multiple goroutines.
WritePacket(packet *Packet) error
// ReadPacket reads header and body from the connection.
// Note: must be safe for concurrent use by multiple goroutines.
ReadPacket(packet *Packet) error
// Read reads data from the connection.
// Read can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
Read(b []byte) (n int, err error)
// Write writes data to the connection.
// Write can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
Write(b []byte) (n int, err error)
// Close closes the connection socket.
// Any blocked Read or Write operations will be unblocked and return errors.
Close() error
// Public returns temporary public data of Socket.
Public() goutil.Map
// PublicLen returns the length of public data of Socket.
PublicLen() int
// Id returns the socket id.
Id() string
// SetId sets the socket id.
SetId(string)
// Reset reset net.Conn and ProtoFunc.
Reset(netConn net.Conn, protoFunc ...ProtoFunc)
}
socket struct {
net.Conn
protocol Proto
id string
idMutex sync.RWMutex
ctxPublic goutil.Map
mu sync.RWMutex
curState int32
fromPool bool
}
)
const (
normal int32 = 0
activeClose int32 = 1
)
var _ net.Conn = Socket(nil)
// ErrProactivelyCloseSocket proactively close the socket error.
var ErrProactivelyCloseSocket = errors.New("socket is closed proactively")
// GetSocket gets a Socket from pool, and reset it.
func GetSocket(c net.Conn, protoFunc ...ProtoFunc) Socket {
s := socketPool.Get().(*socket)
s.Reset(c, protoFunc...)
return s
}
var socketPool = sync.Pool{
New: func() interface{} {
s := newSocket(nil, nil)
s.fromPool = true
return s
},
}
// NewSocket wraps a net.Conn as a Socket.
func NewSocket(c net.Conn, protoFunc ...ProtoFunc) Socket {
return newSocket(c, protoFunc)
}
func newSocket(c net.Conn, protoFuncs []ProtoFunc) *socket {
var s = &socket{
protocol: getProto(protoFuncs, c),
Conn: c,
}
s.optimize()
return s
}
// WritePacket writes header and body to the connection.
// WritePacket can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
// Note:
// For the byte stream type of body, write directly, do not do any processing;
// Must be safe for concurrent use by multiple goroutines.
func (s *socket) WritePacket(packet *Packet) error {
s.mu.RLock()
protocol := s.protocol
s.mu.RUnlock()
err := protocol.Pack(packet)
if err != nil && s.isActiveClosed() {
err = ErrProactivelyCloseSocket
}
return err
}
// ReadPacket reads header and body from the connection.
// Note:
// For the byte stream type of body, read directly, do not do any processing;
// Must be safe for concurrent use by multiple goroutines.
func (s *socket) ReadPacket(packet *Packet) error {
s.mu.RLock()
protocol := s.protocol
s.mu.RUnlock()
return protocol.Unpack(packet)
}
// Public returns temporary public data of Socket.
func (s *socket) Public() goutil.Map {
if s.ctxPublic == nil {
s.ctxPublic = goutil.RwMap()
}
return s.ctxPublic
}
// PublicLen returns the length of public data of Socket.
func (s *socket) PublicLen() int {
if s.ctxPublic == nil {
return 0
}
return s.ctxPublic.Len()
}
// Id returns the socket id.
func (s *socket) Id() string {
s.idMutex.RLock()
id := s.id
if len(id) == 0 {
id = s.RemoteAddr().String()
}
s.idMutex.RUnlock()
return id
}
// SetId sets the socket id.
func (s *socket) SetId(id string) {
s.idMutex.Lock()
s.id = id
s.idMutex.Unlock()
}
// Reset reset net.Conn and ProtoFunc.
func (s *socket) Reset(netConn net.Conn, protoFunc ...ProtoFunc) {
atomic.StoreInt32(&s.curState, activeClose)
if s.Conn != nil {
s.Conn.Close()
}
s.mu.Lock()
s.Conn = netConn
s.SetId("")
s.protocol = getProto(protoFunc, netConn)
atomic.StoreInt32(&s.curState, normal)
s.optimize()
s.mu.Unlock()
}
// Close closes the connection socket.
// Any blocked Read or Write operations will be unblocked and return errors.
// If it is from 'GetSocket()' function(a pool), return itself to pool.
func (s *socket) Close() error {
if s.isActiveClosed() {
return nil
}
s.mu.Lock()
defer s.mu.Unlock()
if s.isActiveClosed() {
return nil
}
atomic.StoreInt32(&s.curState, activeClose)
var err error
if s.Conn != nil {
err = s.Conn.Close()
}
if s.fromPool {
s.Conn = nil
s.ctxPublic = nil
s.protocol = nil
socketPool.Put(s)
}
return err
}
func (s *socket) isActiveClosed() bool {
return atomic.LoadInt32(&s.curState) == activeClose
}
func (s *socket) optimize() {
if c, ok := s.Conn.(ifaceSetKeepAlive); ok {
if changeKeepAlive {
c.SetKeepAlive(keepAlive)
}
if keepAlivePeriod >= 0 && keepAlive {
c.SetKeepAlivePeriod(keepAlivePeriod)
}
}
if c, ok := s.Conn.(ifaceSetBuffer); ok {
if readBuffer >= 0 {
c.SetReadBuffer(readBuffer)
}
if writeBuffer >= 0 {
c.SetWriteBuffer(writeBuffer)
}
}
if c, ok := s.Conn.(ifaceSetNoDelay); ok {
if !noDelay {
c.SetNoDelay(noDelay)
}
}
}
type (
ifaceSetKeepAlive interface {
// SetKeepAlive sets whether the operating system should send
// keepalive messages on the connection.
SetKeepAlive(keepalive bool) error
// SetKeepAlivePeriod sets period between keep alives.
SetKeepAlivePeriod(d time.Duration) error
}
ifaceSetBuffer interface {
// SetReadBuffer sets the size of the operating system's
// receive buffer associated with the connection.
SetReadBuffer(bytes int) error
// SetWriteBuffer sets the size of the operating system's
// transmit buffer associated with the connection.
SetWriteBuffer(bytes int) error
}
ifaceSetNoDelay interface {
// SetNoDelay controls whether the operating system should delay
// packet transmission in hopes of sending fewer packets (Nagle's
// algorithm). The default is true (no delay), meaning that data is
// sent as soon as possible after a Write.
SetNoDelay(noDelay bool) error
}
)
// Connection related system configuration
var (
writeBuffer int = -1
readBuffer int = -1
changeKeepAlive bool = false
keepAlive bool = true
keepAlivePeriod time.Duration = -1
noDelay bool = true
)
// SetKeepAlive sets whether the operating system should send
// keepalive messages on the connection.
// Note: If have not called the function, the system defaults are used.
func SetKeepAlive(keepalive bool) {
changeKeepAlive = true
keepAlive = keepalive
}
// SetKeepAlivePeriod sets period between keep alives.
// Note: if d<0, don't change the value.
func SetKeepAlivePeriod(d time.Duration) {
if d >= 0 {
keepAlivePeriod = d
} else {
fmt.Println("socket: SetKeepAlivePeriod: invalid keepAlivePeriod:", d)
}
}
// ReadBuffer returns the size of the operating system's
// receive buffer associated with the connection.
// Note: if using the system default value, bytes=-1 and isDefault=true.
func ReadBuffer() (bytes int, isDefault bool) {
return readBuffer, readBuffer == -1
}
// SetReadBuffer sets the size of the operating system's
// receive buffer associated with the connection.
// Note: if bytes<0, don't change the value.
func SetReadBuffer(bytes int) {
if bytes >= 0 {
readBuffer = bytes
} else {
fmt.Println("socket: SetReadBuffer: invalid readBuffer size:", bytes)
}
}
// WriteBuffer returns the size of the operating system's
// transmit buffer associated with the connection.
// Note: if using the system default value, bytes=-1 and isDefault=true.
func WriteBuffer() (bytes int, isDefault bool) {
return writeBuffer, writeBuffer == -1
}
// SetWriteBuffer sets the size of the operating system's
// transmit buffer associated with the connection.
// Note: if bytes<0, don't change the value.
func SetWriteBuffer(bytes int) {
if bytes >= 0 {
writeBuffer = bytes
} else {
fmt.Println("socket: SetWriteBuffer: invalid writeBuffer size:", bytes)
}
}
// SetNoDelay controls whether the operating system should delay
// packet transmission in hopes of sending fewer packets (Nagle's
// algorithm). The default is true (no delay), meaning that data is
// sent as soon as possible after a Write.
func SetNoDelay(_noDelay bool) {
noDelay = _noDelay
}
func getProto(protoFuncs []ProtoFunc, rw io.ReadWriter) Proto {
if len(protoFuncs) > 0 && protoFuncs[0] != nil {
return protoFuncs[0](rw)
}
return defaultProtoFunc(rw)
}