seaweedfs/go/weed/weed_server/filer_server_handlers.go
2014-04-15 09:09:40 -07:00

193 lines
5.4 KiB
Go

package weed_server
import (
"code.google.com/p/weed-fs/go/glog"
"code.google.com/p/weed-fs/go/operation"
"code.google.com/p/weed-fs/go/util"
"encoding/json"
"errors"
"github.com/syndtr/goleveldb/leveldb"
"io"
"io/ioutil"
"math/rand"
"net/http"
"net/url"
"strconv"
"strings"
)
func (fs *FilerServer) filerHandler(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
fs.GetOrHeadHandler(w, r, true)
case "HEAD":
fs.GetOrHeadHandler(w, r, false)
case "DELETE":
fs.DeleteHandler(w, r)
case "PUT":
fs.PostHandler(w, r)
case "POST":
fs.PostHandler(w, r)
}
}
func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Request) {
if !strings.HasSuffix(r.URL.Path, "/") {
return
}
dirlist, err := fs.filer.ListDirectories(r.URL.Path)
if err == leveldb.ErrNotFound {
glog.V(3).Infoln("Directory Not Found in db", r.URL.Path)
w.WriteHeader(http.StatusNotFound)
return
}
m := make(map[string]interface{})
m["Directory"] = r.URL.Path
m["Subdirectories"] = dirlist
lastFileName := r.FormValue("lastFileName")
limit, limit_err := strconv.Atoi(r.FormValue("limit"))
if limit_err != nil {
limit = 100
}
m["Files"], _ = fs.filer.ListFiles(r.URL.Path, lastFileName, limit)
writeJsonQuiet(w, r, m)
}
func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request, isGetMethod bool) {
if strings.HasSuffix(r.URL.Path, "/") {
fs.listDirectoryHandler(w, r)
return
}
fileId, err := fs.filer.FindFile(r.URL.Path)
if err == leveldb.ErrNotFound {
glog.V(3).Infoln("Not found in db", r.URL.Path)
w.WriteHeader(http.StatusNotFound)
return
}
parts := strings.Split(fileId, ",")
if len(parts) != 2 {
glog.V(1).Infoln("Invalid fileId", fileId)
w.WriteHeader(http.StatusNotFound)
return
}
lookup, lookupError := operation.Lookup(fs.master, parts[0])
if lookupError != nil {
glog.V(1).Infoln("Invalid lookup", lookupError.Error())
w.WriteHeader(http.StatusNotFound)
return
}
if len(lookup.Locations) == 0 {
glog.V(1).Infoln("Can not find location for volume", parts[0])
w.WriteHeader(http.StatusNotFound)
return
}
urlLocation := lookup.Locations[rand.Intn(len(lookup.Locations))].PublicUrl
u, _ := url.Parse("http://" + urlLocation + "/" + fileId)
request := &http.Request{
Method: r.Method,
URL: u,
Proto: r.Proto,
ProtoMajor: r.ProtoMajor,
ProtoMinor: r.ProtoMinor,
Header: r.Header,
Body: r.Body,
Host: r.Host,
ContentLength: r.ContentLength,
}
glog.V(3).Infoln("retrieving from", u)
resp, do_err := util.Do(request)
if do_err != nil {
glog.V(0).Infoln("failing to connect to volume server", do_err.Error())
writeJsonError(w, r, do_err)
return
}
defer resp.Body.Close()
io.Copy(w, resp.Body)
}
func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
query := r.URL.Query()
assignResult, ae := operation.Assign(fs.master, 1, query.Get("replication"), fs.collection)
if ae != nil {
glog.V(0).Infoln("failing to assign a file id", ae.Error())
writeJsonError(w, r, ae)
return
}
u, _ := url.Parse("http://" + assignResult.PublicUrl + "/" + assignResult.Fid)
glog.V(4).Infoln("post to", u)
request := &http.Request{
Method: r.Method,
URL: u,
Proto: r.Proto,
ProtoMajor: r.ProtoMajor,
ProtoMinor: r.ProtoMinor,
Header: r.Header,
Body: r.Body,
Host: r.Host,
ContentLength: r.ContentLength,
}
resp, do_err := util.Do(request)
if do_err != nil {
glog.V(0).Infoln("failing to connect to volume server", do_err.Error())
writeJsonError(w, r, do_err)
return
}
defer resp.Body.Close()
resp_body, ra_err := ioutil.ReadAll(resp.Body)
if ra_err != nil {
glog.V(0).Infoln("failing to upload to volume server", ra_err.Error())
writeJsonError(w, r, ra_err)
return
}
glog.V(4).Infoln("post result", string(resp_body))
var ret operation.UploadResult
unmarshal_err := json.Unmarshal(resp_body, &ret)
if unmarshal_err != nil {
glog.V(0).Infoln("failing to read upload resonse", string(resp_body))
writeJsonError(w, r, unmarshal_err)
return
}
if ret.Error != "" {
glog.V(0).Infoln("failing to post to volume server", ra_err.Error())
writeJsonError(w, r, errors.New(ret.Error))
return
}
path := r.URL.Path
if strings.HasSuffix(path, "/") {
if ret.Name != "" {
path += ret.Name
} else {
operation.DeleteFile(fs.master, assignResult.Fid) //clean up
glog.V(0).Infoln("Can not to write to folder", path, "without a file name!")
writeJsonError(w, r, errors.New("Can not to write to folder "+path+" without a file name"))
return
}
}
glog.V(4).Infoln("saving", path, "=>", assignResult.Fid)
if db_err := fs.filer.CreateFile(path, assignResult.Fid); db_err != nil {
operation.DeleteFile(fs.master, assignResult.Fid) //clean up
glog.V(0).Infoln("failing to write to filer server", db_err.Error())
writeJsonError(w, r, db_err)
return
}
}
func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
var err error
var fid string
if strings.HasSuffix(r.URL.Path, "/") {
err = fs.filer.DeleteDirectory(r.URL.Path)
} else {
fid, err = fs.filer.DeleteFile(r.URL.Path)
if err == nil {
err = operation.DeleteFile(fs.master, fid)
}
}
if err == nil {
w.WriteHeader(http.StatusAccepted)
writeJsonQuiet(w, r, map[string]string{"error": ""})
} else {
glog.V(4).Infoln("deleting", r.URL.Path, ":", err.Error())
writeJsonError(w, r, err)
}
}