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bridge.go
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bridge.go
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package bridge
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
"sync"
"time"
"github.com/KevinGong2013/ggbot/bridge/arg"
r "github.com/KevinGong2013/ggbot/bridge/result"
log "github.com/Sirupsen/logrus"
)
// Connector is design to connect iOS wechat app
type Connector interface {
RefreshToken(token string)
Send(a *arg.Arg) error
}
var logger = log.WithFields(log.Fields{
"module": "bridge",
})
// Wrapper ...
type Wrapper struct {
connector Connector
mutex sync.Mutex
seq uint64
pending map[uint64]chan *r.Result
}
// NewWrapper ...
func NewWrapper(c Connector) *Wrapper {
w := &Wrapper{
connector: c,
pending: make(map[uint64]chan *r.Result),
}
//
http.HandleFunc("/bridge", w.handle)
go http.ListenAndServe(`:3280`, nil)
return w
}
// Go ...
func (w *Wrapper) Go(a *arg.Arg, done chan *r.Result) {
w.mutex.Lock()
seq := w.seq
w.seq++
w.pending[seq] = done
a.Seq = seq // 很重要
w.mutex.Unlock()
err := w.connector.Send(a)
if err != nil {
done <- r.NewResultWithError(err.Error())
w.mutex.Lock()
delete(w.pending, seq)
w.mutex.Unlock()
}
}
// Call ..
func (w *Wrapper) Call(a *arg.Arg) *r.Result {
done := make(chan *r.Result, 1)
w.Go(a, done)
timer := time.NewTimer(time.Minute * 1).C
select {
case r := <-done:
if r.IsFailure() {
logger.Errorf(`send %v to wechat app failed error: %v`, a, r.Err)
} else {
logger.Infof(`send %v to wechat app successed`, a)
}
return r
case <-timer:
logger.Errorf(`send %v to wechat app time out`, a)
return r.NewResultWithError(fmt.Sprintf(`time out %v`, a))
}
}
func (w *Wrapper) handle(writer http.ResponseWriter, req *http.Request) {
defer req.Body.Close()
logger.Debugf(`---cmd:%v------ did receive wechat app response`, req.Header[`Cmd`])
seqs := req.Header[`Seq`]
cmds := req.Header[`Cmd`]
if len(seqs) == 0 || len(cmds) == 0 {
logger.Errorf(`invalidate req %v`, req)
return
}
seq, _ := strconv.ParseUint(seqs[0], 10, 32)
cmd, _ := strconv.Atoi(cmds[0])
var result map[string]interface{}
decoder := json.NewDecoder(req.Body)
err := decoder.Decode(&result)
if err != nil {
logger.Errorf(`decode error: %v`, err)
return
}
logger.Debugf(`---seq:[%v]------ body: %v`, seq, result)
if seq == 0 && cmd == arg.Token {
t, _ := result[`token`].(string)
w.connector.RefreshToken(t)
} else if seq == 0 && cmd == arg.RedPacket {
status, _ := result[`status`].(string)
if status == `opened` {
logger.Info(`wechat app did open a redpacket`)
}
} else {
w.mutex.Lock()
done := w.pending[seq]
delete(w.pending, seq)
w.mutex.Unlock()
done <- r.NewResultWithMap(result)
}
}