func serverHasBlob(bs blobserver.BlobStatter, br *blobref.BlobRef) (have bool, err os.Error) {
ch := make(chan blobref.SizedBlobRef, 1)
go func() {
err = bs.StatBlobs(ch, []*blobref.BlobRef{br}, 0)
close(ch)
}()
for _ = range ch {
have = true
}
return
}
func handleStat(conn http.ResponseWriter, req *http.Request, storage blobserver.BlobStatter) {
if w, ok := storage.(blobserver.ContextWrapper); ok {
storage = w.WrapContext(req)
}
toStat := make([]*blobref.BlobRef, 0)
switch req.Method {
case "POST":
fallthrough
case "GET":
camliVersion := req.FormValue("camliversion")
if camliVersion == "" {
httputil.BadRequestError(conn, "No camliversion")
return
}
n := 0
for {
n++
key := fmt.Sprintf("blob%v", n)
value := req.FormValue(key)
if value == "" {
n--
break
}
if n > maxStatBlobs {
httputil.BadRequestError(conn, "Too many stat blob checks")
return
}
ref := blobref.Parse(value)
if ref == nil {
httputil.BadRequestError(conn, "Bogus blobref for key "+key)
return
}
toStat = append(toStat, ref)
}
default:
httputil.BadRequestError(conn, "Invalid method.")
return
}
waitSeconds := 0
if waitStr := req.FormValue("maxwaitsec"); waitStr != "" {
waitSeconds, _ = strconv.Atoi(waitStr)
switch {
case waitSeconds < 0:
waitSeconds = 0
case waitSeconds > 30:
// TODO: don't hard-code 30. push this up into a blobserver interface
// for getting the configuration of the server (ultimately a flag in
// in the binary)
waitSeconds = 30
}
}
statRes := make([]map[string]interface{}, 0)
if len(toStat) > 0 {
blobch := make(chan blobref.SizedBlobRef)
resultch := make(chan os.Error, 1)
go func() {
err := storage.StatBlobs(blobch, toStat, waitSeconds)
close(blobch)
resultch <- err
}()
for sb := range blobch {
ah := make(map[string]interface{})
ah["blobRef"] = sb.BlobRef.String()
ah["size"] = sb.Size
statRes = append(statRes, ah)
}
err := <-resultch
if err != nil {
log.Printf("Stat error: %v", err)
conn.WriteHeader(http.StatusInternalServerError)
return
}
}
configer, _ := storage.(blobserver.Configer)
ret := commonUploadResponse(configer, req)
ret["stat"] = statRes
ret["canLongPoll"] = true
httputil.ReturnJson(conn, ret)
}