func (self *remoteService) run(ws *websocket.Conn) error {
for {
mt, msg, err := ws.ReadMessage()
if err != nil {
fmt.Printf("remoteService.run: %#v\n", err)
break
}
if mt != websocket.BinaryMessage {
continue
}
cmd := cmdResult{}
if err := json.NewDecoder(bytes.NewReader(msg)).Decode(&cmd); err != nil {
return err
}
if cmd.Id == nil {
if err := self.handleEvent(cmd.Back, cmd.Sid, stream.Event([]byte(cmd.Data))); err != nil {
return err
}
} else {
if err := self.handleCmdRes(*cmd.Id, cmd.Data); err != nil {
return err
}
}
}
return nil
}
func (self *httpBackendStream) Read(from uint, to uint) (stream.Stream, error) {
if from == to {
return stream.Empty(), nil
}
resp, err := self.p.Post(fmt.Sprintf(self.readUrl, from, to), nil)
if err != nil {
return nil, err
}
defer resp.Body.Close()
res := arrErrorObj{}
if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
return nil, err
}
if res.Err != "" {
return nil, errors.New(res.Err)
}
r := make([]stream.Event, len(res.Events))
for i, v := range res.Events {
r[i] = stream.Event([]byte(v))
}
return stream.List(r), nil
}
func (self *ledisListStream) Next() (stream.Event, error) {
if self.num >= self.l {
return nil, stream.EOI
}
res, err := self.db.LIndex(self.key, self.num)
if err != nil {
self.delLock.RUnlock()
return nil, err
}
self.num += 1
if self.num >= self.l {
self.delLock.RUnlock()
}
return stream.Event(res), nil
}
func addCmdHandler(s Service, d []byte) error {
data := addCmdData{}
if err := json.NewDecoder(bytes.NewReader(d)).Decode(&data); err != nil {
return err
}
b, err := s.GetBackend(data.Back)
if err != nil {
return err
}
str, _, err := b.GetStream(data.Name)
if err != nil {
return err
}
return str.Add(stream.Event([]byte(data.Evt)))
}
/*
Create a http.Handler that maps URLs from HTTP backend to a methods of an object implementing Backend interface.
*/
func NewHandler(b Backend, errorCb func(error)) http.Handler {
r := mux.NewRouter()
r.HandleFunc("/config", func(w http.ResponseWriter, r *http.Request) {
cfg, err := b.Config()
if err != nil {
sendErr(w, err, errorCb)
return
}
if err := json.NewEncoder(w).Encode(&configRes{Cfg: cfg}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
r.HandleFunc("/streams", func(w http.ResponseWriter, r *http.Request) {
ss, err := b.Streams()
if err != nil {
sendErr(w, err, errorCb)
return
}
if err := json.NewEncoder(w).Encode(&sarrErrorObj{Streams: ss}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
r.HandleFunc("/drop", func(w http.ResponseWriter, r *http.Request) {
sendErr(w, b.Drop(), errorCb)
}).Methods("POST")
r.HandleFunc("/streams/{name}/push", func(w http.ResponseWriter, r *http.Request) {
data, err := ioutil.ReadAll(r.Body)
if err != nil {
sendErr(w, err, errorCb)
return
}
s, err := b.GetStream(mux.Vars(r)["name"])
if err != nil {
sendErr(w, err, errorCb)
return
}
defer func() {
if err := s.Close(); err != nil {
errorCb(err)
}
}()
sendErr(w, s.Add(stream.Event(data)), errorCb)
}).Methods("POST")
r.HandleFunc("/streams/{name}/interval/{from}:{to}", func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
s, err := b.GetStream(vars["name"])
if err != nil {
sendErr(w, err, errorCb)
return
}
defer func() {
if err := s.Close(); err != nil {
errorCb(err)
}
}()
from, err := strconv.Atoi(vars["from"])
if err != nil {
sendErr(w, err, errorCb)
return
}
to, err := strconv.Atoi(vars["to"])
if err != nil {
sendErr(w, err, errorCb)
return
}
f, t, err := s.Interval(from, to)
if err != nil {
sendErr(w, err, errorCb)
return
}
if err := json.NewEncoder(w).Encode(&interErrorObj{From: f, To: t}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
r.HandleFunc("/streams/{name}/read/{from}:{to}", func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
s, err := b.GetStream(vars["name"])
if err != nil {
sendErr(w, err, errorCb)
return
}
defer func() {
if err := s.Close(); err != nil {
errorCb(err)
}
}()
from, err := strconv.Atoi(vars["from"])
if err != nil {
sendErr(w, err, errorCb)
return
}
if from < 0 {
sendErr(w, errors.New(fmt.Sprintf("Expected \"from\" to be >= 0, got %v", from)), errorCb)
return
}
to, err := strconv.Atoi(vars["to"])
if err != nil {
sendErr(w, err, errorCb)
return
}
if to < 0 {
sendErr(w, errors.New(fmt.Sprintf("Expected \"to\" to be >= 0, got %v", to)), errorCb)
return
}
str, err := s.Read(uint(from), uint(to))
if err != nil {
sendErr(w, err, errorCb)
return
}
l := 0
if to >= 0 {
l = to - from
}
res := make([]json.RawMessage, 0, l)
for {
evt, err := str.Next()
if err == stream.EOI {
break
}
if err != nil {
sendErr(w, err, errorCb)
return
}
bs, ok := evt.([]byte)
if !ok {
sendErr(w, errors.New(fmt.Sprintf("Expected []byte event, got %v", evt)), errorCb)
return
}
res = append(res, json.RawMessage(bs))
}
if err := json.NewEncoder(w).Encode(&arrErrorObj{Events: res}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
r.HandleFunc("/streams/{name}/del/{from}:{to}", func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
s, err := b.GetStream(vars["name"])
if err != nil {
sendErr(w, err, errorCb)
return
}
defer func() {
if err := s.Close(); err != nil {
errorCb(err)
}
}()
from, err := strconv.Atoi(vars["from"])
if err != nil {
sendErr(w, err, errorCb)
return
}
if from < 0 {
sendErr(w, errors.New(fmt.Sprintf("Expected \"from\" to be >= 0, got %v", from)), errorCb)
return
}
to, err := strconv.Atoi(vars["to"])
if err != nil {
sendErr(w, err, errorCb)
return
}
if to < 0 {
sendErr(w, errors.New(fmt.Sprintf("Expected \"to\" to be >= 0, got %v", to)), errorCb)
return
}
ok, err := s.Del(uint(from), uint(to))
if err != nil {
sendErr(w, err, errorCb)
return
}
if err := json.NewEncoder(w).Encode(&boolErrorObj{Ok: ok}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
r.HandleFunc("/streams/{name}/len", func(w http.ResponseWriter, r *http.Request) {
s, err := b.GetStream(mux.Vars(r)["name"])
if err != nil {
sendErr(w, err, errorCb)
return
}
defer func() {
if err := s.Close(); err != nil {
errorCb(err)
}
}()
l, err := s.Len()
if err != nil {
sendErr(w, err, errorCb)
return
}
if err := json.NewEncoder(w).Encode(&lenErrorObj{Len: l}); err != nil {
sendErr(w, err, errorCb)
return
}
}).Methods("POST")
return r
}
