seaweedfs/weed-fs/src/cmd/weed/volume.go

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package main
import (
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"log"
"math/rand"
"mime"
"net/http"
"pkg/storage"
"strconv"
"strings"
"time"
)
func init() {
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cmdVolume.Run = runVolume // break init cycle
IsDebug = cmdVolume.Flag.Bool("debug", false, "enable debug mode")
port = cmdVolume.Flag.Int("port", 8080, "http listen port")
}
var cmdVolume = &Command{
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UsageLine: "volume -port=8080 -dir=/tmp -volumes=0-99 -publicUrl=server_name:8080 -mserver=localhost:9333",
Short: "start a volume server",
Long: `start a volume server to provide storage spaces
`,
}
var (
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chunkFolder = cmdVolume.Flag.String("dir", "/tmp", "data directory to store files")
volumes = cmdVolume.Flag.String("volumes", "0,1-3,4", "comma-separated list of volume ids or range of ids")
publicUrl = cmdVolume.Flag.String("publicUrl", "localhost:8080", "public url to serve data read")
metaServer = cmdVolume.Flag.String("mserver", "localhost:9333", "master directory server to store mappings")
pulse = cmdVolume.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
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store *storage.Store
)
func statusHandler(w http.ResponseWriter, r *http.Request) {
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writeJson(w, r, store.Status())
}
func addVolumeHandler(w http.ResponseWriter, r *http.Request) {
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store.AddVolume(r.FormValue("volume"))
writeJson(w, r, store.Status())
}
func storeHandler(w http.ResponseWriter, r *http.Request) {
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switch r.Method {
case "GET":
GetHandler(w, r)
case "DELETE":
DeleteHandler(w, r)
case "POST":
PostHandler(w, r)
}
}
func GetHandler(w http.ResponseWriter, r *http.Request) {
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n := new(storage.Needle)
vid, fid, ext := parseURLPath(r.URL.Path)
volumeId, _ := storage.NewVolumeId(vid)
n.ParsePath(fid)
if *IsDebug {
log.Println("volume", volumeId, "reading", n)
}
cookie := n.Cookie
count, e := store.Read(volumeId, n)
if *IsDebug {
log.Println("read bytes", count, "error", e)
}
if n.Cookie != cookie {
log.Println("request with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
return
}
if ext != "" {
mtype := mime.TypeByExtension(ext)
w.Header().Set("Content-Type", mtype)
if storage.IsCompressable(ext, mtype) {
if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
w.Header().Set("Content-Encoding", "gzip")
} else {
n.Data = storage.UnGzipData(n.Data)
}
}
}
w.Write(n.Data)
}
func PostHandler(w http.ResponseWriter, r *http.Request) {
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vid, _, _ := parseURLPath(r.URL.Path)
volumeId, e := storage.NewVolumeId(vid)
if e != nil {
writeJson(w, r, e)
} else {
needle, ne := storage.NewNeedle(r)
if ne != nil {
writeJson(w, r, ne)
} else {
ret := store.Write(volumeId, needle)
m := make(map[string]uint32)
m["size"] = ret
writeJson(w, r, m)
}
}
}
func DeleteHandler(w http.ResponseWriter, r *http.Request) {
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n := new(storage.Needle)
vid, fid, _ := parseURLPath(r.URL.Path)
volumeId, _ := storage.NewVolumeId(vid)
n.ParsePath(fid)
if *IsDebug {
log.Println("deleting", n)
}
cookie := n.Cookie
count, ok := store.Read(volumeId, n)
if ok != nil {
m := make(map[string]uint32)
m["size"] = 0
writeJson(w, r, m)
return
}
if n.Cookie != cookie {
log.Println("delete with unmaching cookie from ", r.RemoteAddr, "agent", r.UserAgent())
return
}
n.Size = 0
store.Delete(volumeId, n)
m := make(map[string]uint32)
m["size"] = uint32(count)
writeJson(w, r, m)
}
func parseURLPath(path string) (vid, fid, ext string) {
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sepIndex := strings.LastIndex(path, "/")
commaIndex := strings.LastIndex(path[sepIndex:], ",")
if commaIndex <= 0 {
if "favicon.ico" != path[sepIndex+1:] {
log.Println("unknown file id", path[sepIndex+1:])
}
return
}
dotIndex := strings.LastIndex(path[sepIndex:], ".")
vid = path[sepIndex+1 : commaIndex]
fid = path[commaIndex+1:]
ext = ""
if dotIndex > 0 {
fid = path[commaIndex+1 : dotIndex]
ext = path[dotIndex:]
}
return
}
func runVolume(cmd *Command, args []string) bool {
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//TODO: now default to 1G, this value should come from server?
store = storage.NewStore(*port, *publicUrl, *chunkFolder, *volumes)
defer store.Close()
http.HandleFunc("/", storeHandler)
http.HandleFunc("/status", statusHandler)
http.HandleFunc("/add_volume", addVolumeHandler)
go func() {
for {
store.Join(*metaServer)
time.Sleep(time.Duration(float32(*pulse*1e3)*(1+rand.Float32())) * time.Millisecond)
}
}()
log.Println("store joined at", *metaServer)
log.Println("Start storage service at http://127.0.0.1:"+strconv.Itoa(*port), "public url", *publicUrl)
e := http.ListenAndServe(":"+strconv.Itoa(*port), nil)
if e != nil {
log.Fatalf("Fail to start:", e)
}
return true
}