/*
Copyright 2013 The Camlistore Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package server
import (
"encoding/json"
"fmt"
"html"
"log"
"net/http"
"regexp"
"strings"
"camlistore.org/pkg/blobserver"
"camlistore.org/pkg/buildinfo"
"camlistore.org/pkg/httputil"
"camlistore.org/pkg/index"
"camlistore.org/pkg/jsonconfig"
)
// StatusHandler publishes server status information.
type StatusHandler struct {
prefix string
handlerFinder blobserver.FindHandlerByTyper
}
func init() {
blobserver.RegisterHandlerConstructor("status", newStatusFromConfig)
}
func newStatusFromConfig(ld blobserver.Loader, conf jsonconfig.Obj) (h http.Handler, err error) {
if err := conf.Validate(); err != nil {
return nil, err
}
return &StatusHandler{
prefix: ld.MyPrefix(),
handlerFinder: ld,
}, nil
}
func (sh *StatusHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
suffix := httputil.PathSuffix(req)
if !httputil.IsGet(req) {
http.Error(rw, "Illegal status method.", http.StatusMethodNotAllowed)
return
}
switch suffix {
case "status.json":
sh.serveStatusJSON(rw, req)
case "":
sh.serveStatusHTML(rw, req)
default:
http.Error(rw, "Illegal status path.", 404)
}
}
type status struct {
Version string `json:"version"`
Error string `json:"error,omitempty"`
Sync map[string]syncStatus `json:"sync"`
Storage map[string]storageStatus `json:"storage"`
rootPrefix string
}
func (st *status) isHandler(pfx string) bool {
if _, ok := st.Sync[pfx]; ok {
return true
}
if _, ok := st.Storage[pfx]; ok {
return true
}
return false
}
type storageStatus struct {
Primary bool `json:"primary,omitempty"`
IsIndex bool `json:"isIndex,omitempty"`
Type string `json:"type"`
ApproxBlobs int `json:"approximateBlobs"`
ApproxBytes int `json:"approximateBytes"`
ImplStatus interface{} `json:"implStatus,omitempty"`
}
func (sh *StatusHandler) currentStatus() *status {
res := &status{
Version: buildinfo.Version(),
Storage: make(map[string]storageStatus),
Sync: make(map[string]syncStatus),
}
_, hi, err := sh.handlerFinder.FindHandlerByType("root")
if err != nil {
res.Error = fmt.Sprintf("Error finding root handler: %v", err)
return res
}
rh := hi.(*RootHandler)
res.rootPrefix = rh.Prefix
types, handlers := sh.handlerFinder.AllHandlers()
// Sync
for pfx, h := range handlers {
sh, ok := h.(*SyncHandler)
if !ok {
continue
}
res.Sync[pfx] = sh.currentStatus()
}
// Storage
for pfx, typ := range types {
if !strings.HasPrefix(typ, "storage-") {
continue
}
h := handlers[pfx]
_, isIndex := h.(*index.Index)
res.Storage[pfx] = storageStatus{
Type: strings.TrimPrefix(typ, "storage-"),
Primary: pfx == rh.BlobRoot,
IsIndex: isIndex,
}
}
return res
}
func (sh *StatusHandler) serveStatusJSON(rw http.ResponseWriter, req *http.Request) {
httputil.ReturnJSON(rw, sh.currentStatus())
}
var quotedPrefix = regexp.MustCompile(`[;"]/(\S+?/)[&"]`)
func (sh *StatusHandler) serveStatusHTML(rw http.ResponseWriter, req *http.Request) {
st := sh.currentStatus()
f := func(p string, a ...interface{}) {
fmt.Fprintf(rw, p, a...)
}
f("Status")
f("Status
")
f("As JSON: status.json; and the discovery JSON.
", st.rootPrefix)
f("Not yet pretty HTML UI:
")
js, err := json.MarshalIndent(st, "", " ")
if err != nil {
log.Printf("JSON marshal error: %v", err)
}
jsh := html.EscapeString(string(js))
jsh = quotedPrefix.ReplaceAllStringFunc(jsh, func(in string) string {
pfx := in[1 : len(in)-1]
if st.isHandler(pfx) {
return fmt.Sprintf("%s%s%s", in[:1], pfx, pfx, in[len(in)-1:])
}
return in
})
f("%s
", jsh)
}