seaweedfs/go/weed/weed_server/common.go

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package weed_server
import (
"bytes"
"code.google.com/p/weed-fs/go/glog"
"code.google.com/p/weed-fs/go/operation"
"code.google.com/p/weed-fs/go/stats"
"code.google.com/p/weed-fs/go/storage"
"code.google.com/p/weed-fs/go/util"
"encoding/json"
"fmt"
"net"
"net/http"
"path/filepath"
"strconv"
"strings"
)
var serverStats *stats.ServerStats
func init() {
serverStats = stats.NewServerStats()
go serverStats.Start()
}
func writeJson(w http.ResponseWriter, r *http.Request, obj interface{}) (err error) {
var bytes []byte
if r.FormValue("pretty") != "" {
bytes, err = json.MarshalIndent(obj, "", " ")
} else {
bytes, err = json.Marshal(obj)
}
if err != nil {
return
}
callback := r.FormValue("callback")
if callback == "" {
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(bytes)
} else {
w.Header().Set("Content-Type", "application/javascript")
if _, err = w.Write([]uint8(callback)); err != nil {
return
}
if _, err = w.Write([]uint8("(")); err != nil {
return
}
fmt.Fprint(w, string(bytes))
if _, err = w.Write([]uint8(")")); err != nil {
return
}
}
return
}
// wrapper for writeJson - just logs errors
func writeJsonQuiet(w http.ResponseWriter, r *http.Request, obj interface{}) {
if err := writeJson(w, r, obj); err != nil {
glog.V(0).Infof("error writing JSON %s: %s", obj, err.Error())
}
}
func writeJsonError(w http.ResponseWriter, r *http.Request, err error) {
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w.WriteHeader(http.StatusInternalServerError)
m := make(map[string]interface{})
m["error"] = err.Error()
writeJsonQuiet(w, r, m)
}
func debug(params ...interface{}) {
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glog.V(4).Infoln(params)
}
func secure(whiteList []string, f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if len(whiteList) == 0 {
f(w, r)
return
}
host, _, err := net.SplitHostPort(r.RemoteAddr)
if err == nil {
for _, ip := range whiteList {
if ip == host {
f(w, r)
return
}
}
}
writeJsonQuiet(w, r, map[string]interface{}{"error": "No write permisson from " + host})
}
}
func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl string) {
m := make(map[string]interface{})
if r.Method != "POST" {
m["error"] = "Only submit via POST!"
writeJsonQuiet(w, r, m)
return
}
debug("parsing upload file...")
fname, data, mimeType, isGzipped, lastModified, pe := storage.ParseUpload(r)
if pe != nil {
writeJsonError(w, r, pe)
return
}
debug("assigning file id for", fname)
assignResult, ae := operation.Assign(masterUrl, 1, r.FormValue("replication"), r.FormValue("collection"))
if ae != nil {
writeJsonError(w, r, ae)
return
}
url := "http://" + assignResult.PublicUrl + "/" + assignResult.Fid
if lastModified != 0 {
url = url + "?ts=" + strconv.FormatUint(lastModified, 10)
}
debug("upload file to store", url)
uploadResult, err := operation.Upload(url, fname, bytes.NewReader(data), isGzipped, mimeType)
if err != nil {
writeJsonError(w, r, err)
return
}
m["fileName"] = fname
m["fid"] = assignResult.Fid
m["fileUrl"] = assignResult.PublicUrl + "/" + assignResult.Fid
m["size"] = uploadResult.Size
writeJsonQuiet(w, r, m)
return
}
func deleteForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl string) {
r.ParseForm()
fids := r.Form["fid"]
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ret, err := operation.DeleteFiles(masterUrl, fids)
if err != nil {
writeJsonError(w, r, err)
return
}
writeJsonQuiet(w, r, ret)
}
func parseURLPath(path string) (vid, fid, filename, ext string, isVolumeIdOnly bool) {
switch strings.Count(path, "/") {
case 3:
parts := strings.Split(path, "/")
vid, fid, filename = parts[1], parts[2], parts[3]
ext = filepath.Ext(filename)
case 2:
parts := strings.Split(path, "/")
vid, fid = parts[1], parts[2]
dotIndex := strings.LastIndex(fid, ".")
if dotIndex > 0 {
ext = fid[dotIndex:]
fid = fid[0:dotIndex]
}
default:
sepIndex := strings.LastIndex(path, "/")
commaIndex := strings.LastIndex(path[sepIndex:], ",")
if commaIndex <= 0 {
vid, isVolumeIdOnly = path[sepIndex+1:], true
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 statsCounterHandler(w http.ResponseWriter, r *http.Request) {
m := make(map[string]interface{})
m["Version"] = util.VERSION
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m["Counters"] = serverStats
writeJsonQuiet(w, r, m)
}
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func statsMemoryHandler(w http.ResponseWriter, r *http.Request) {
m := make(map[string]interface{})
m["Version"] = util.VERSION
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m["Memory"] = stats.MemStat()
writeJsonQuiet(w, r, m)
}