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package weed_server
import ( "context" "io" "io/ioutil" "mime" "mime/multipart" "net/http" "net/url" "path" "strconv" "strings"
"github.com/chrislusf/seaweedfs/weed/filer2" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/util")
func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request, isGetMethod bool) { path := r.URL.Path if strings.HasSuffix(path, "/") && len(path) > 1 { path = path[:len(path)-1] }
entry, err := fs.filer.FindEntry(context.Background(), filer2.FullPath(path)) if err != nil { if path == "/" { fs.listDirectoryHandler(w, r) return } glog.V(1).Infof("Not found %s: %v", path, err) w.WriteHeader(http.StatusNotFound) return }
if entry.IsDirectory() { if fs.option.DisableDirListing { w.WriteHeader(http.StatusMethodNotAllowed) return } fs.listDirectoryHandler(w, r) return }
if len(entry.Chunks) == 0 { glog.V(1).Infof("no file chunks for %s, attr=%+v", path, entry.Attr) w.WriteHeader(http.StatusNoContent) return }
w.Header().Set("Accept-Ranges", "bytes") if r.Method == "HEAD" { w.Header().Set("Content-Length", strconv.FormatInt(int64(filer2.TotalSize(entry.Chunks)), 10)) w.Header().Set("Last-Modified", entry.Attr.Mtime.Format(http.TimeFormat)) setEtag(w, filer2.ETag(entry.Chunks)) return }
if len(entry.Chunks) == 1 { fs.handleSingleChunk(w, r, entry) return }
fs.handleMultipleChunks(w, r, entry)
}
func (fs *FilerServer) handleSingleChunk(w http.ResponseWriter, r *http.Request, entry *filer2.Entry) {
fileId := entry.Chunks[0].FileId
urlString, err := fs.filer.MasterClient.LookupFileId(fileId) if err != nil { glog.V(1).Infof("operation LookupFileId %s failed, err: %v", fileId, err) w.WriteHeader(http.StatusNotFound) return }
if fs.option.RedirectOnRead { http.Redirect(w, r, urlString, http.StatusFound) return }
u, _ := url.Parse(urlString) q := u.Query() for key, values := range r.URL.Query() { for _, value := range values { q.Add(key, value) } } u.RawQuery = q.Encode() 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, http.StatusInternalServerError, do_err) return } defer func() { io.Copy(ioutil.Discard, resp.Body) resp.Body.Close() }() for k, v := range resp.Header { w.Header()[k] = v } if entry.Attr.Mime != "" { w.Header().Set("Content-Type", entry.Attr.Mime) } w.WriteHeader(resp.StatusCode) io.Copy(w, resp.Body)}
func (fs *FilerServer) handleMultipleChunks(w http.ResponseWriter, r *http.Request, entry *filer2.Entry) {
mimeType := entry.Attr.Mime if mimeType == "" { if ext := path.Ext(entry.Name()); ext != "" { mimeType = mime.TypeByExtension(ext) } } if mimeType != "" { w.Header().Set("Content-Type", mimeType) } setEtag(w, filer2.ETag(entry.Chunks))
totalSize := int64(filer2.TotalSize(entry.Chunks))
rangeReq := r.Header.Get("Range")
if rangeReq == "" { w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10)) if err := fs.writeContent(w, entry, 0, int(totalSize)); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } return }
//the rest is dealing with partial content request
//mostly copy from src/pkg/net/http/fs.go
ranges, err := parseRange(rangeReq, totalSize) if err != nil { http.Error(w, err.Error(), http.StatusRequestedRangeNotSatisfiable) return } if sumRangesSize(ranges) > totalSize { // The total number of bytes in all the ranges
// is larger than the size of the file by
// itself, so this is probably an attack, or a
// dumb client. Ignore the range request.
return } if len(ranges) == 0 { return } if len(ranges) == 1 { // RFC 2616, Section 14.16:
// "When an HTTP message includes the content of a single
// range (for example, a response to a request for a
// single range, or to a request for a set of ranges
// that overlap without any holes), this content is
// transmitted with a Content-Range header, and a
// Content-Length header showing the number of bytes
// actually transferred.
// ...
// A response to a request for a single range MUST NOT
// be sent using the multipart/byteranges media type."
ra := ranges[0] w.Header().Set("Content-Length", strconv.FormatInt(ra.length, 10)) w.Header().Set("Content-Range", ra.contentRange(totalSize)) w.WriteHeader(http.StatusPartialContent)
err = fs.writeContent(w, entry, ra.start, int(ra.length)) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } return }
// process multiple ranges
for _, ra := range ranges { if ra.start > totalSize { http.Error(w, "Out of Range", http.StatusRequestedRangeNotSatisfiable) return } } sendSize := rangesMIMESize(ranges, mimeType, totalSize) pr, pw := io.Pipe() mw := multipart.NewWriter(pw) w.Header().Set("Content-Type", "multipart/byteranges; boundary="+mw.Boundary()) sendContent := pr defer pr.Close() // cause writing goroutine to fail and exit if CopyN doesn't finish.
go func() { for _, ra := range ranges { part, e := mw.CreatePart(ra.mimeHeader(mimeType, totalSize)) if e != nil { pw.CloseWithError(e) return } if e = fs.writeContent(part, entry, ra.start, int(ra.length)); e != nil { pw.CloseWithError(e) return } } mw.Close() pw.Close() }() if w.Header().Get("Content-Encoding") == "" { w.Header().Set("Content-Length", strconv.FormatInt(sendSize, 10)) } w.WriteHeader(http.StatusPartialContent) if _, err := io.CopyN(w, sendContent, sendSize); err != nil { http.Error(w, "Internal Error", http.StatusInternalServerError) return }
}
func (fs *FilerServer) writeContent(w io.Writer, entry *filer2.Entry, offset int64, size int) error {
chunkViews := filer2.ViewFromChunks(entry.Chunks, offset, size)
fileId2Url := make(map[string]string)
for _, chunkView := range chunkViews {
urlString, err := fs.filer.MasterClient.LookupFileId(chunkView.FileId) if err != nil { glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err) return err } fileId2Url[chunkView.FileId] = urlString }
for _, chunkView := range chunkViews { urlString := fileId2Url[chunkView.FileId] _, err := util.ReadUrlAsStream(urlString, chunkView.Offset, int(chunkView.Size), func(data []byte) { w.Write(data) }) if err != nil { glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err) return err } }
return nil
}
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