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session.go
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session.go
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package gearmin
import (
"bufio"
"bytes"
"net"
"sync"
)
type event struct {
cmd packet // Command type.
args *cmdArgs // Command arguments.
result chan interface{} // Channel used by the server to return data to the worker.
sessionID int64 // Identifier of the worker session.
}
func newEvent(cmd packet, args *cmdArgs, sessionID int64) *event {
return &event{
cmd: cmd,
args: args,
sessionID: sessionID,
}
}
func newEventWithResults(cmd packet, args *cmdArgs, sessionID int64) *event {
event := newEvent(cmd, args, sessionID)
event.result = make(chan interface{}, 1)
return event
}
type cmdArgs struct {
t0 interface{}
t1 interface{}
}
func decodeArgs(cmd packet, buf []byte) ([][]byte, bool) {
argc := cmd.ArgCount()
if argc == 0 {
return nil, true
}
args := make([][]byte, 0, argc)
if argc == 1 {
args = append(args, buf)
return args, true
}
endPos := 0
cnt := 0
for ; cnt < argc-1 && endPos < len(buf); cnt++ {
startPos := endPos
pos := bytes.IndexByte(buf[startPos:], 0x0)
if pos == -1 {
return nil, false
}
endPos = startPos + pos
args = append(args, buf[startPos:endPos])
endPos++
}
args = append(args, buf[endPos:]) // option data
cnt++
if cnt != argc {
return nil, false
}
return args, true
}
const (
workerStatusRunning = 1
workerStatusSleep = 2
workerStatusPrepareForSleep = 3
)
type worker struct {
id string // Identifier set by the worker (optional).
sessionID int64 // Session identifier.
status int // Worker status.
inbox chan []byte // Used to deliver messages to the worker.
runningJobsByHandle map[string]*job // Running jobs by their handles.
canDo map[string]struct{} // Known function names.
}
func (w *worker) wakeUp() {
w.inbox <- wakeUpReply
}
type session struct {
w *worker
}
func (s *session) getWorker(sessionID int64, inbox chan []byte) *worker {
if s.w != nil {
return s.w
}
s.w = &worker{
sessionID: sessionID,
status: workerStatusSleep,
inbox: inbox,
runningJobsByHandle: make(map[string]*job),
canDo: make(map[string]struct{}),
}
return s.w
}
func (se *session) handleConnection(s *Server, conn net.Conn) {
sessionID := s.allocSessionID()
inbox := make(chan []byte, 200)
outbox := make(chan []byte, 200)
var wg sync.WaitGroup
defer func() {
wg.Wait() // Wait until we're done processing.
s.handleCloseSession(sessionID) // Remove session from the server.
close(inbox) // Notify writer to quit.
}()
wg.Add(1)
go func() {
defer wg.Done()
queueingWriter(inbox, outbox)
}()
wg.Add(1)
go func() {
defer wg.Done()
writer(conn, outbox)
}()
r := bufio.NewReaderSize(conn, 256*1024)
// todo:1. reuse event's result channel, create less garbage.
// 2. heavily rely on goroutine switch, send reply in EventLoop can make it faster, but logic is not that clean
// so i am not going to change it right now, maybe never
fb, err := r.Peek(1)
if err != nil {
return
}
// Admin connection, we're not going to handle it.
if fb[0] != byte(0) {
return
}
se.handleBinaryConnection(s, r, sessionID, inbox)
}
func (se *session) handleBinaryConnection(s *Server, r *bufio.Reader, sessionID int64, inbox chan []byte) {
for {
pt, buf, err := readMessage(r)
if err != nil {
return
}
args, ok := decodeArgs(pt, buf)
if !ok {
return
}
switch pt {
case packetCanDo, packetCanDoTimeout:
se.w = se.getWorker(sessionID, inbox)
s.requests <- &event{cmd: pt, args: &cmdArgs{t0: se.w, t1: string(args[0])}}
case packetCantDo:
s.requests <- &event{cmd: pt, sessionID: sessionID, args: &cmdArgs{t0: string(args[0])}}
case packetEchoReq:
sendReply(inbox, packetEchoRes, [][]byte{buf})
case packetPreSleep:
se.w = se.getWorker(sessionID, inbox)
s.requests <- &event{cmd: pt, args: &cmdArgs{t0: se.w}, sessionID: sessionID}
case packetSetClientId:
se.w = se.getWorker(sessionID, inbox)
s.requests <- &event{cmd: pt, args: &cmdArgs{t0: se.w, t1: string(args[0])}}
case packetGrabJobUniq:
if se.w == nil {
return
}
e := newEventWithResults(pt, nil, sessionID)
s.requests <- e
job := (<-e.result).(*job)
if job == nil {
sendReplyResult(inbox, noJobReply)
break
}
sendReply(inbox, packetJobAssignUniq, [][]byte{
[]byte(job.Handle), []byte(job.FuncName), []byte(job.ID), job.Data,
})
case packetWorkData, packetWorkWarning, packetWorkStatus, packetWorkComplete, packetWorkFail, packetWorkException:
if se.w == nil {
return
}
s.requests <- &event{
cmd: pt, args: &cmdArgs{t0: args},
sessionID: sessionID,
}
}
}
}