seaweedfs/weed/server/filer_server_handlers_read.go

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package weed_server
import (
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"io"
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"net/http"
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"net/url"
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"strconv"
"strings"
"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/operation"
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ui "github.com/chrislusf/seaweedfs/weed/server/filer_ui"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/syndtr/goleveldb/leveldb"
)
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// listDirectoryHandler lists directories and folers under a directory
// files are sorted by name and paginated via "lastFileName" and "limit".
// sub directories are listed on the first page, when "lastFileName"
// is empty.
func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Request) {
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if !strings.HasSuffix(r.URL.Path, "/") {
return
}
limit, limit_err := strconv.Atoi(r.FormValue("limit"))
if limit_err != nil {
limit = 100
}
lastFileName := r.FormValue("lastFileName")
files, err := fs.filer.ListFiles(r.URL.Path, lastFileName, limit)
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if err == leveldb.ErrNotFound {
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glog.V(0).Infof("Error %s", err)
w.WriteHeader(http.StatusNotFound)
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return
}
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directories, err2 := fs.filer.ListDirectories(r.URL.Path)
if err2 == leveldb.ErrNotFound {
glog.V(0).Infof("Error %s", err)
w.WriteHeader(http.StatusNotFound)
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return
}
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shouldDisplayLoadMore := len(files) > 0
lastFileName = ""
if len(files) > 0 {
lastFileName = files[len(files)-1].Name
files2, err3 := fs.filer.ListFiles(r.URL.Path, lastFileName, limit)
if err3 == leveldb.ErrNotFound {
glog.V(0).Infof("Error %s", err)
w.WriteHeader(http.StatusNotFound)
return
}
shouldDisplayLoadMore = len(files2) > 0
}
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args := struct {
Path string
Files interface{}
Directories interface{}
Limit int
LastFileName string
ShouldDisplayLoadMore bool
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}{
r.URL.Path,
files,
directories,
limit,
lastFileName,
shouldDisplayLoadMore,
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}
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ui.StatusTpl.Execute(w, args)
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}
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func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request, isGetMethod bool) {
if strings.HasSuffix(r.URL.Path, "/") {
if fs.disableDirListing {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
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
}
urlLocation, err := operation.LookupFileId(fs.getMasterNode(), fileId)
if err != nil {
glog.V(1).Infoln("operation LookupFileId %s failed, err is %s", fileId, err.Error())
w.WriteHeader(http.StatusNotFound)
return
}
urlString := urlLocation
if fs.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 resp.Body.Close()
for k, v := range resp.Header {
w.Header()[k] = v
}
w.WriteHeader(resp.StatusCode)
io.Copy(w, resp.Body)
}