/
actor.go
341 lines (313 loc) · 8.35 KB
/
actor.go
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package kernel
import (
"runtime/debug"
"sync/atomic"
"time"
)
type initResult struct {
ok bool
err interface{}
}
var actorID int64 = 0
var callIndex int64 = 1
func makePid() int64 {
start:
id := atomic.AddInt64(&actorID, 1)
// 损失一点点性能,判断重复
if _, ok := kernelAliveMap.Load(id); ok {
goto start
}
return id
}
type CallInfo struct {
RecCh chan interface{}
CallID int64
Request interface{}
}
type CallResult struct {
ID int64
Result interface{}
}
func ActorOpt(opt ...interface{}) []interface{} {
return opt
}
func Start(newActor *Actor, args ...interface{}) (*Pid, interface{}) {
return StartOpt(newActor, nil, args...)
}
func StartName(name string, newActor *Actor, args ...interface{}) (*Pid, interface{}) {
opt := []interface{}{regName(name)}
return StartOpt(newActor, opt, args...)
}
func StartNameOpt(name string, newActor *Actor, opt []interface{}, args ...interface{}) (*Pid, interface{}) {
opt = append(opt, regName(name))
return StartOpt(newActor, opt, args...)
}
func CastNameNode(name string, node interface{}, msg interface{}) {
var dn *Node
switch n := node.(type) {
case string:
dn = GetNode(n)
case *Node:
dn = n
default:
ErrorLog("badarg:%#v", node)
return
}
if dn.Equal(SelfNode()) {
CastName(name, msg)
return
}
defer func() {recover()}()
if p, ok := GetNodeNetWork(dn); ok {
m := &NodeMsgName{Dest: name, Msg: msg}
p.c <- m
}
}
func CastName(name string, msg interface{}) {
if pid := WhereIs(name); pid != nil {
Cast(pid, msg)
}
}
func Cast(pid *Pid, msg interface{}) {
// 浪费一点性能,使得发送不会因为对端退出而阻塞,或者panic
defer func() {recover()}()
if pid.node != nil {
if p, ok := GetNodeNetWork(pid.node); ok {
m := &NodeMsg{Dest: pid, Msg: msg}
p.c <- m
}
return
}
pid.c <- msg
}
func Call(pid *Pid, request interface{}) (bool, interface{}) {
return CallTimeOut(pid, request, 5)
}
func CallName(name string, request interface{}) (bool, interface{}) {
if pid := WhereIs(name); pid != nil {
return CallTimeOut(pid, request, 5)
}
return false, &CallError{ErrType: CallErrorTypeNoProc}
}
func CallNameNode(name string, node interface{}, request interface{}) (bool, interface{}) {
c := make(chan interface{})
return callNameNode(name,node,request,c,true,recResult)
}
func CallTimeOut(pid *Pid, request interface{}, timeOut time.Duration) (bool, interface{}) {
c := make(chan interface{})
return callTimeOut(pid, request, timeOut, c,true, recResult)
}
func callTimeOut(pid *Pid, request interface{}, timeOut time.Duration, rc chan interface{},closeRC bool,
recvFun func(int64, chan interface{}, time.Duration) (bool, interface{})) (bool, interface{}) {
// 浪费一点性能,使得发送不会因为对端退出而阻塞,或者panic
defer func() {recover()}()
if closeRC {
defer close(rc)
}
callID := makeCallID()
if pid.node != nil {
// 其他节点,需要构造额外信息
if p, ok := GetNodeNetWork(pid.node); ok {
ci := &NodeCall{Dest: pid, Req: request, CallID: callID, Ch: rc}
p.c <- ci
ok, result := recvFun(callID, rc, timeOut)
return ok, result
}
return false, &CallError{ErrType: CallErrorTypeNodeNotConnect}
} else {
ci := &CallInfo{RecCh: rc, CallID: callID, Request: request}
pid.c <- ci
ok, result := recvFun(callID, rc, timeOut)
return ok, result
}
}
func callNameNode(name string, node interface{}, request interface{},rc chan interface{},closeRC bool,
recvFun func(int64, chan interface{}, time.Duration) (bool, interface{})) (bool, interface{}) {
var dn *Node
switch n := node.(type) {
case string:
dn = GetNode(n)
case *Node:
dn = n
default:
ErrorLog("badarg:%#v", node)
return false, nil
}
if dn.Equal(SelfNode()) {
if pid := WhereIs(name); pid != nil {
return callTimeOut(pid, request, 5,rc,closeRC,recvFun)
}
return false, &CallError{ErrType: CallErrorTypeNoProc}
}
defer func() {recover()}()
if closeRC {
defer close(rc)
}
if p, ok := GetNodeNetWork(dn); ok {
callID := makeCallID()
ci := &NodeCallName{Dest: name, Req: request, CallID: callID, Ch: rc}
p.c <- ci
ok, result := recvFun(callID, rc, 5)
return ok, result
}
return false, &CallError{ErrType: CallErrorTypeNodeNotConnect}
}
func StartOpt(actor *Actor, opt []interface{}, args ...interface{}) (*Pid, interface{}) {
c := make(chan interface{}, getCacheSize(opt))
id := makePid()
pid := &Pid{0, id, c, make(chan interface{}, 1), nil}
ok, err := startGO(pid, actor, opt, args...)
if ok {
return pid, nil
}
close(pid.c)
close(pid.callResult)
return nil, err
}
func startGO(pid *Pid, actor *Actor, opt []interface{}, args ...interface{}) (ok bool, err interface{}) {
context := &Context{self: pid, actor: actor,callMode: call_mode_normal}
defer func() {
if !ok {
err = recover()
ErrorLog("catch error:%s,Stack:%s", err, debug.Stack())
context.initExit(opt)
}
}()
context.parseOP(opt) // 在init之前执行,仅仅是为了注册名字
// 向init注册启动
if initServerPid != nil {
context.Link(initRegister(pid))
}
context.State = actor.Init(context, pid, args...)
addAliveMap(pid)
atomic.AddInt32(&pid.isAlive, 1) // 用于判断进程存活,可以快速判断,不需要全局锁
ok = true
go loop(pid, context)
// 修改为在同一个进程中执行初始化逻辑,减少启动进程的栈浪费,并且defer不会执行
return
}
func getCacheSize(opt []interface{}) int {
for _, op := range opt {
switch o := op.(type) {
case ActorChanCacheSize:
return int(o)
}
}
return Env.ActorChanCacheSize
}
func loop(pid *Pid, context *Context) {
var iStop *initStop = nil
defer exitFinal(context, &iStop)
for {
recMsg(pid, context, &iStop)
if iStop != nil {
break
}
}
}
func recMsg(pid *Pid, ctx *Context, stop **initStop) {
defer func() {
if err := recover(); err != nil {
ErrorLog("catch error Reason: %s,Stack: %s", err, debug.Stack())
if ctx.actor.ErrorHandler == nil || !ctx.actor.ErrorHandler(ctx, err) {
ctx.terminateReason = &Terminate{Reason: "error"}
*stop = &initStop{reply: false}
}
}
}()
var msg interface{}
for {
if msg = ctx.msgQ.Pop(); msg != nil {
} else {
rec:
select {
case msg = <-pid.c:
case msg = <-pid.callResult: // 损失一些性能,防止call通道阻塞,导致对端阻塞
ErrorLog("un handle callResult Result:%#v", msg)
goto rec
}
}
switch m := msg.(type) {
case *CallInfo:
ctx.handleCall(m)
case *actorOP:
code, reason := ctx.handleOP(m.op)
switch code {
case actorCodeExit:
ctx.terminateReason = reason
*stop = &initStop{reply: false}
return
case actorCodeInitStop:
ctx.terminateReason = reason
t := m.op.(*initStop)
t.reply = true
*stop = t
return
default:
}
default:
ctx.actor.HandleCast(ctx, msg)
}
}
}
func exitFinal(context *Context, stop **initStop) {
defer func() {
err := recover()
if err != nil {
ErrorLog("catch error Reason: %s,Stack: %s", err, debug.Stack())
}
close(context.self.callResult) //之所以要关闭,是为了防止对端无辜阻塞
close(context.self.c)
}()
removeAliveMap(context.self)
context.self.SetDie()
var reason *Terminate
if context.terminateReason != nil {
reason = context.terminateReason
}
p := recover()
if p != nil {
ErrorLog("actor exit,Reason:%s,Stack:%s", p, debug.Stack())
reason = &Terminate{Reason: ExitReasonError}
}
if len(context.links) > 0 {
msg := &PidExit{Pid: context.self, Reason: reason}
for _, pid := range context.links {
Cast(pid, msg)
}
}
if context.actor.Terminate != nil {
CatchFun(func() { context.actor.Terminate(context, reason) })
}
if context.name != "" {
UnRegister(context.name)
}
if *stop != nil && (*stop).reply {
Reply((*stop).recCh, (*stop).callID, true)
}
}
func recResult(callID int64, c chan interface{}, timeOut time.Duration) (bool, interface{}) {
t := time.NewTimer(timeOut * time.Second)
rec:
select {
case result := <-c:
r := result.(*CallResult)
if r.ID == callID {
t.Stop()
return true, r.Result
}
ErrorLog("not match callResult ID,%d,%d", r.ID, callID)
goto rec
case <-t.C:
ErrorLog("rec callResult timeout")
return false, &CallError{CallErrorTypeTimeOut, nil}
}
}
func makeCallID() int64 {
return atomic.AddInt64(&callIndex, 1)
}
func Reply(recCh chan interface{}, callID int64, result interface{}) {
defer func() {recover()}() // 理论上可以预见问题
r := &CallResult{callID, result}
recCh <- r
}