seaweedfs/weed-fs/src/cmd/weed/master.go
2012-08-23 19:13:14 -07:00

89 lines
2.9 KiB
Go

package main
import (
"pkg/directory"
"encoding/json"
"log"
"net/http"
"pkg/topology"
"strconv"
"strings"
)
func init() {
cmdMaster.Run = runMaster // break init cycle
IsDebug = cmdMaster.Flag.Bool("debug", false, "enable debug mode")
port = cmdMaster.Flag.Int("port", 8080, "http listen port")
}
var cmdMaster = &Command{
UsageLine: "master -port=9333",
Short: "start a master server",
Long: `start a master server to provide volume=>location mapping service
and sequence number of file ids
`,
}
var (
metaFolder = cmdMaster.Flag.String("mdir", "/tmp", "data directory to store mappings")
capacity = cmdMaster.Flag.Int("capacity", 100, "maximum number of volumes to hold")
mapper *directory.Mapper
volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 32*1024, "Default Volume Size in MegaBytes")
)
func dirLookupHandler(w http.ResponseWriter, r *http.Request) {
vid := r.FormValue("volumeId")
commaSep := strings.Index(vid, ",")
if commaSep > 0 {
vid = vid[0:commaSep]
}
volumeId, _ := strconv.ParseUint(vid, 10, 64)
machine, e := mapper.Get(uint32(volumeId))
if e == nil {
writeJson(w, r, machine.Server)
} else {
log.Println("Invalid volume id", volumeId)
writeJson(w, r, map[string]string{"error": "volume id " + strconv.FormatUint(volumeId, 10) + " not found"})
}
}
func dirAssignHandler(w http.ResponseWriter, r *http.Request) {
c:=r.FormValue("count")
fid, count, machine, err := mapper.PickForWrite(c)
if err == nil {
writeJson(w, r, map[string]string{"fid": fid, "url": machine.Url, "publicUrl":machine.PublicUrl, "count":strconv.Itoa(count)})
} else {
log.Println(err)
writeJson(w, r, map[string]string{"error": err.Error()})
}
}
func dirJoinHandler(w http.ResponseWriter, r *http.Request) {
s := r.RemoteAddr[0:strings.Index(r.RemoteAddr, ":")+1] + r.FormValue("port")
publicUrl := r.FormValue("publicUrl")
volumes := new([]topology.VolumeInfo)
json.Unmarshal([]byte(r.FormValue("volumes")), volumes)
if *IsDebug {
log.Println(s, "volumes", r.FormValue("volumes"))
}
mapper.Add(*directory.NewMachine(s, publicUrl, *volumes))
}
func dirStatusHandler(w http.ResponseWriter, r *http.Request) {
writeJson(w, r, mapper)
}
func runMaster(cmd *Command, args []string) bool {
log.Println("Volume Size Limit is", *volumeSizeLimitMB, "MB")
mapper = directory.NewMapper(*metaFolder, "directory", uint64(*volumeSizeLimitMB)*1024*1024)
http.HandleFunc("/dir/assign", dirAssignHandler)
http.HandleFunc("/dir/lookup", dirLookupHandler)
http.HandleFunc("/dir/join", dirJoinHandler)
http.HandleFunc("/dir/status", dirStatusHandler)
log.Println("Start directory service at http://127.0.0.1:" + strconv.Itoa(*port))
e := http.ListenAndServe(":"+strconv.Itoa(*port), nil)
if e != nil {
log.Fatal("Fail to start:", e)
}
return true
}