2012-08-07 08:29:22 +00:00
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package main
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import (
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2012-09-04 02:18:02 +00:00
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"encoding/json"
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"log"
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"net/http"
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"pkg/directory"
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"pkg/storage"
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"strconv"
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"strings"
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2012-08-07 08:29:22 +00:00
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)
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func init() {
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2012-09-04 02:18:02 +00:00
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cmdMaster.Run = runMaster // break init cycle
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IsDebug = cmdMaster.Flag.Bool("debug", false, "enable debug mode")
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2012-08-07 08:29:22 +00:00
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}
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var cmdMaster = &Command{
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2012-09-04 02:18:02 +00:00
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UsageLine: "master -port=9333",
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Short: "start a master server",
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Long: `start a master server to provide volume=>location mapping service
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2012-08-07 08:29:22 +00:00
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and sequence number of file ids
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`,
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}
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var (
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2012-09-04 02:18:02 +00:00
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mport = cmdMaster.Flag.Int("port", 9333, "http listen port")
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metaFolder = cmdMaster.Flag.String("mdir", "/tmp", "data directory to store mappings")
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capacity = cmdMaster.Flag.Int("capacity", 100, "maximum number of volumes to hold")
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mapper *directory.Mapper
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volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 32*1024, "Default Volume Size in MegaBytes")
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2012-08-07 08:29:22 +00:00
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)
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func dirLookupHandler(w http.ResponseWriter, r *http.Request) {
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2012-09-04 02:18:02 +00:00
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vid := r.FormValue("volumeId")
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commaSep := strings.Index(vid, ",")
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if commaSep > 0 {
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vid = vid[0:commaSep]
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}
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volumeId, _ := storage.NewVolumeId(vid)
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machine, e := mapper.Get(volumeId)
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if e == nil {
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writeJson(w, r, map[string]string{"url": machine.Url, "publicUrl": machine.PublicUrl})
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} else {
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log.Println("Invalid volume id", volumeId)
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writeJson(w, r, map[string]string{"error": "volume id " + volumeId.String() + " not found"})
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}
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2012-08-07 08:29:22 +00:00
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}
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func dirAssignHandler(w http.ResponseWriter, r *http.Request) {
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2012-09-04 02:18:02 +00:00
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c := r.FormValue("count")
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fid, count, machine, err := mapper.PickForWrite(c)
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if err == nil {
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writeJson(w, r, map[string]string{"fid": fid, "url": machine.Url, "publicUrl": machine.PublicUrl, "count": strconv.Itoa(count)})
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} else {
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writeJson(w, r, map[string]string{"error": err.Error()})
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}
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2012-08-07 08:29:22 +00:00
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}
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func dirJoinHandler(w http.ResponseWriter, r *http.Request) {
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2012-09-04 02:18:02 +00:00
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s := r.RemoteAddr[0:strings.Index(r.RemoteAddr, ":")+1] + r.FormValue("port")
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publicUrl := r.FormValue("publicUrl")
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volumes := new([]storage.VolumeInfo)
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json.Unmarshal([]byte(r.FormValue("volumes")), volumes)
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if *IsDebug {
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log.Println(s, "volumes", r.FormValue("volumes"))
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}
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mapper.Add(*directory.NewMachine(s, publicUrl, *volumes))
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2012-08-07 08:29:22 +00:00
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}
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func dirStatusHandler(w http.ResponseWriter, r *http.Request) {
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2012-09-04 02:18:02 +00:00
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writeJson(w, r, mapper)
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2012-08-07 08:29:22 +00:00
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}
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func runMaster(cmd *Command, args []string) bool {
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2012-09-04 02:18:02 +00:00
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log.Println("Volume Size Limit is", *volumeSizeLimitMB, "MB")
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mapper = directory.NewMapper(*metaFolder, "directory", uint64(*volumeSizeLimitMB)*1024*1024)
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http.HandleFunc("/dir/assign", dirAssignHandler)
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http.HandleFunc("/dir/lookup", dirLookupHandler)
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http.HandleFunc("/dir/join", dirJoinHandler)
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http.HandleFunc("/dir/status", dirStatusHandler)
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2012-08-07 08:29:22 +00:00
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2012-09-04 02:18:02 +00:00
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log.Println("Start directory service at http://127.0.0.1:" + strconv.Itoa(*mport))
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e := http.ListenAndServe(":"+strconv.Itoa(*mport), nil)
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if e != nil {
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log.Fatal("Fail to start:", e)
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}
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return true
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2012-08-07 08:29:22 +00:00
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}
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