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agent.go
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agent.go
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// Copyright (c) nano Author. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package nano
import (
"errors"
"fmt"
"net"
"reflect"
"sync/atomic"
"time"
"github.com/lonng/nano/internal/codec"
"github.com/lonng/nano/internal/message"
"github.com/lonng/nano/internal/packet"
"github.com/lonng/nano/session"
)
const (
agentWriteBacklog = 16
)
var (
// ErrBrokenPipe represents the low-level connection has broken.
ErrBrokenPipe = errors.New("broken low-level pipe")
// ErrBufferExceed indicates that the current session buffer is full and
// can not receive more data.
ErrBufferExceed = errors.New("session send buffer exceed")
)
type (
// Agent corresponding a user, used for store raw conn information
agent struct {
// regular agent member
session *session.Session // session
conn net.Conn // low-level conn fd
lastMid uint // last message id
state int32 // current agent state
chDie chan struct{} // wait for close
chSend chan pendingMessage // push message queue
lastAt int64 // last heartbeat unix time stamp
decoder *codec.Decoder // binary decoder
options *options
srv reflect.Value // cached session reflect.Value
}
pendingMessage struct {
typ message.Type // message type
route string // message route(push)
mid uint // response message id(response)
payload interface{} // payload
}
)
// Create new agent instance
func newAgent(conn net.Conn, options *options) *agent {
a := &agent{
conn: conn,
state: statusStart,
chDie: make(chan struct{}),
lastAt: time.Now().Unix(),
chSend: make(chan pendingMessage, agentWriteBacklog),
decoder: codec.NewDecoder(),
options: options,
}
// binding session
s := session.New(a)
a.session = s
a.srv = reflect.ValueOf(s)
return a
}
func (a *agent) send(m pendingMessage) (err error) {
defer func() {
if e := recover(); e != nil {
err = ErrBrokenPipe
}
}()
a.chSend <- m
return
}
func (a *agent) MID() uint {
return a.lastMid
}
// Push, implementation for session.NetworkEntity interface
func (a *agent) Push(route string, v interface{}) error {
if a.status() == statusClosed {
return ErrBrokenPipe
}
if len(a.chSend) >= agentWriteBacklog {
return ErrBufferExceed
}
if env.debug {
switch d := v.(type) {
case []byte:
logger.Println(fmt.Sprintf("Type=Push, ID=%d, UID=%d, Route=%s, Data=%dbytes",
a.session.ID(), a.session.UID(), route, len(d)))
default:
logger.Println(fmt.Sprintf("Type=Push, ID=%d, UID=%d, Route=%s, Data=%+v",
a.session.ID(), a.session.UID(), route, v))
}
}
return a.send(pendingMessage{typ: message.Push, route: route, payload: v})
}
// Response, implementation for session.NetworkEntity interface
// Response message to session
func (a *agent) Response(v interface{}) error {
return a.ResponseMID(a.lastMid, v)
}
// Response, implementation for session.NetworkEntity interface
// Response message to session
func (a *agent) ResponseMID(mid uint, v interface{}) error {
if a.status() == statusClosed {
return ErrBrokenPipe
}
if mid <= 0 {
return ErrSessionOnNotify
}
if len(a.chSend) >= agentWriteBacklog {
return ErrBufferExceed
}
if env.debug {
switch d := v.(type) {
case []byte:
logger.Println(fmt.Sprintf("Type=Response, ID=%d, UID=%d, MID=%d, Data=%dbytes",
a.session.ID(), a.session.UID(), mid, len(d)))
default:
logger.Println(fmt.Sprintf("Type=Response, ID=%d, UID=%d, MID=%d, Data=%+v",
a.session.ID(), a.session.UID(), mid, v))
}
}
return a.send(pendingMessage{typ: message.Response, mid: mid, payload: v})
}
// Close, implementation for session.NetworkEntity interface
// Close closes the agent, clean inner state and close low-level connection.
// Any blocked Read or Write operations will be unblocked and return errors.
func (a *agent) Close() error {
if a.status() == statusClosed {
return ErrCloseClosedSession
}
a.setStatus(statusClosed)
if env.debug {
logger.Println(fmt.Sprintf("Session closed, ID=%d, UID=%d, IP=%s",
a.session.ID(), a.session.UID(), a.conn.RemoteAddr()))
}
// prevent closing closed channel
select {
case <-a.chDie:
// expect
default:
close(a.chDie)
handler.chCloseSession <- a.session
}
return a.conn.Close()
}
// RemoteAddr, implementation for session.NetworkEntity interface
// returns the remote network address.
func (a *agent) RemoteAddr() net.Addr {
return a.conn.RemoteAddr()
}
// String, implementation for Stringer interface
func (a *agent) String() string {
return fmt.Sprintf("Remote=%s, LastTime=%d", a.conn.RemoteAddr().String(), a.lastAt)
}
func (a *agent) status() int32 {
return atomic.LoadInt32(&a.state)
}
func (a *agent) setStatus(state int32) {
atomic.StoreInt32(&a.state, state)
}
func (a *agent) write() {
ticker := time.NewTicker(env.heartbeat)
chWrite := make(chan []byte, agentWriteBacklog)
// clean func
defer func() {
ticker.Stop()
close(a.chSend)
close(chWrite)
a.Close()
if env.debug {
logger.Println(fmt.Sprintf("Session write goroutine exit, SessionID=%d, UID=%d", a.session.ID(), a.session.UID()))
}
}()
for {
select {
case <-ticker.C:
deadline := time.Now().Add(-2 * env.heartbeat).Unix()
if a.lastAt < deadline {
logger.Println(fmt.Sprintf("Session heartbeat timeout, LastTime=%d, Deadline=%d", a.lastAt, deadline))
return
}
chWrite <- hbd
case data := <-chWrite:
// close agent while low-level conn broken
if _, err := a.conn.Write(data); err != nil {
logger.Println(err.Error())
return
}
case data := <-a.chSend:
payload, err := serializeOrRaw(data.payload)
if err != nil {
switch data.typ {
case message.Push:
logger.Println(fmt.Sprintf("Push: %s error: %s", data.route, err.Error()))
case message.Response:
logger.Println(fmt.Sprintf("Response message(id: %d) error: %s", data.mid, err.Error()))
default:
// expect
}
break
}
// construct message and encode
m := &message.Message{
Type: data.typ,
Data: payload,
Route: data.route,
ID: data.mid,
}
if pipe := a.options.pipeline; pipe != nil {
err := pipe.Outbound().Process(a.session, Message{m})
if err != nil {
logger.Println("broken pipeline", err.Error())
break
}
}
em, err := m.Encode()
if err != nil {
logger.Println(err.Error())
break
}
// packet encode
p, err := codec.Encode(packet.Data, em)
if err != nil {
logger.Println(err)
break
}
chWrite <- p
case <-a.chDie: // agent closed signal
return
case <-env.die: // application quit
return
}
}
}