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handler.go
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/
handler.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 (
"encoding/json"
"fmt"
"net"
"reflect"
"time"
"github.com/lonnng/nano/component"
"github.com/lonnng/nano/internal/codec"
"github.com/lonnng/nano/internal/message"
"github.com/lonnng/nano/internal/packet"
"github.com/lonnng/nano/session"
)
// Unhandled message buffer size
const packetBacklog = 1024
const funcBacklog = 1 << 8
var (
// handler service singleton
handler = newHandlerService()
// serialized data
hrd []byte // handshake response data
hbd []byte // heartbeat packet data
)
func hbdEncode() {
data, err := json.Marshal(map[string]interface{}{
"code": 200,
"sys": map[string]float64{"heartbeat": env.heartbeat.Seconds()},
})
if err != nil {
panic(err)
}
hrd, err = codec.Encode(packet.Handshake, data)
if err != nil {
panic(err)
}
hbd, err = codec.Encode(packet.Heartbeat, nil)
if err != nil {
panic(err)
}
}
type (
handlerService struct {
services map[string]*component.Service // all registered service
handlers map[string]*component.Handler // all handler method
chLocalProcess chan unhandledMessage // packets that process locally
chCloseSession chan *session.Session // closed session
chFunction chan func() // function that called in logic gorontine
options *options
}
unhandledMessage struct {
agent *agent
lastMid uint
handler reflect.Method
args []reflect.Value
}
)
func newHandlerService() *handlerService {
h := &handlerService{
services: make(map[string]*component.Service),
handlers: make(map[string]*component.Handler),
chLocalProcess: make(chan unhandledMessage, packetBacklog),
chCloseSession: make(chan *session.Session, packetBacklog),
chFunction: make(chan func(), funcBacklog),
options: &options{},
}
return h
}
// call handler with protected
func pcall(method reflect.Method, args []reflect.Value) {
defer func() {
if err := recover(); err != nil {
logger.Println(fmt.Sprintf("nano/dispatch: %v", err))
println(stack())
}
}()
if r := method.Func.Call(args); len(r) > 0 {
if err := r[0].Interface(); err != nil {
logger.Println(err.(error).Error())
}
}
}
// call handler with protected
func pinvoke(fn func()) {
defer func() {
if err := recover(); err != nil {
logger.Println(fmt.Sprintf("nano/invoke: %v", err))
println(stack())
}
}()
fn()
}
func onSessionClosed(s *session.Session) {
defer func() {
if err := recover(); err != nil {
logger.Println(fmt.Sprintf("nano/onSessionClosed: %v", err))
println(stack())
}
}()
env.muCallbacks.RLock()
defer env.muCallbacks.RUnlock()
if len(env.callbacks) < 1 {
return
}
for _, fn := range env.callbacks {
fn(s)
}
}
// dispatch message to corresponding logic handler
func (h *handlerService) dispatch() {
// close chLocalProcess & chCloseSession when application quit
defer func() {
close(h.chLocalProcess)
close(h.chCloseSession)
globalTicker.Stop()
}()
// handle packet that sent to chLocalProcess
for {
select {
case m := <-h.chLocalProcess: // logic dispatch
m.agent.lastMid = m.lastMid
pcall(m.handler, m.args)
case s := <-h.chCloseSession: // session closed callback
onSessionClosed(s)
case fn := <-h.chFunction:
pinvoke(fn)
case <-globalTicker.C: // execute cron task
cron()
case t := <-timerManager.chCreatedTimer: // new timers
timerManager.timers[t.id] = t
case id := <-timerManager.chClosingTimer: // closing timers
delete(timerManager.timers, id)
case <-env.die: // application quit signal
return
}
}
}
func (h *handlerService) register(comp component.Component, opts []component.Option) error {
s := component.NewService(comp, opts)
if _, ok := h.services[s.Name]; ok {
return fmt.Errorf("handler: service already defined: %s", s.Name)
}
if err := s.ExtractHandler(); err != nil {
return err
}
// register all handlers
h.services[s.Name] = s
for name, handler := range s.Handlers {
h.handlers[fmt.Sprintf("%s.%s", s.Name, name)] = handler
}
return nil
}
func (h *handlerService) handle(conn net.Conn) {
// create a client agent and startup write gorontine
agent := newAgent(conn, h.options)
// startup write goroutine
go agent.write()
if env.debug {
logger.Println(fmt.Sprintf("New session established: %s", agent.String()))
}
// guarantee agent related resource be destroyed
defer func() {
agent.Close()
if env.debug {
logger.Println(fmt.Sprintf("Session read goroutine exit, SessionID=%d, UID=%d", agent.session.ID(), agent.session.UID()))
}
}()
// read loop
buf := make([]byte, 2048)
for {
n, err := conn.Read(buf)
if err != nil {
logger.Println(fmt.Sprintf("Read message error: %s, session will be closed immediately", err.Error()))
return
}
// TODO(warning): decoder use slice for performance, packet data should be copy before next Decode
packets, err := agent.decoder.Decode(buf[:n])
if err != nil {
logger.Println(err.Error())
return
}
if len(packets) < 1 {
continue
}
// process all packet
for i := range packets {
if err := h.processPacket(agent, packets[i]); err != nil {
logger.Println(err.Error())
return
}
}
}
}
func (h *handlerService) processPacket(agent *agent, p *packet.Packet) error {
switch p.Type {
case packet.Handshake:
if _, err := agent.conn.Write(hrd); err != nil {
return err
}
agent.setStatus(statusHandshake)
if env.debug {
logger.Println(fmt.Sprintf("Session handshake Id=%d, Remote=%s", agent.session.ID(), agent.conn.RemoteAddr()))
}
case packet.HandshakeAck:
agent.setStatus(statusWorking)
if env.debug {
logger.Println(fmt.Sprintf("Receive handshake ACK Id=%d, Remote=%s", agent.session.ID(), agent.conn.RemoteAddr()))
}
case packet.Data:
if agent.status() < statusWorking {
return fmt.Errorf("receive data on socket which not yet ACK, session will be closed immediately, remote=%s",
agent.conn.RemoteAddr().String())
}
msg, err := message.Decode(p.Data)
if err != nil {
return err
}
h.processMessage(agent, msg)
case packet.Heartbeat:
// expected
}
agent.lastAt = time.Now().Unix()
return nil
}
func (h *handlerService) processMessage(agent *agent, msg *message.Message) {
var lastMid uint
switch msg.Type {
case message.Request:
lastMid = msg.ID
case message.Notify:
lastMid = 0
}
handler, ok := h.handlers[msg.Route]
if !ok {
logger.Println(fmt.Sprintf("nano/handler: %s not found(forgot registered?)", msg.Route))
return
}
if pipe := h.options.pipeline; pipe != nil {
pipe.Inbound().Process(agent.session, Message{msg})
}
var payload = msg.Data
var data interface{}
if handler.IsRawArg {
data = payload
} else {
data = reflect.New(handler.Type.Elem()).Interface()
err := serializer.Unmarshal(payload, data)
if err != nil {
logger.Println("deserialize error", err.Error())
return
}
}
if env.debug {
logger.Println(fmt.Sprintf("UID=%d, Message={%s}, Data=%+v", agent.session.UID(), msg.String(), data))
}
args := []reflect.Value{handler.Receiver, agent.srv, reflect.ValueOf(data)}
h.chLocalProcess <- unhandledMessage{agent, lastMid, handler.Method, args}
}
// DumpServices outputs all registered services
func (h *handlerService) DumpServices() {
for name := range h.handlers {
logger.Println("registered service", name)
}
}