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/*
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"
"errors"
"fmt"
"html"
"io"
"log"
"net/http"
"os"
"reflect"
"regexp"
"runtime"
"strings"
"time"
"camlistore.org/pkg/blobserver"
"camlistore.org/pkg/buildinfo"
"camlistore.org/pkg/env"
"camlistore.org/pkg/httputil"
"camlistore.org/pkg/index"
"camlistore.org/pkg/osutil"
"camlistore.org/pkg/search"
"camlistore.org/pkg/server/app"
"camlistore.org/pkg/types/camtypes"
"cloud.google.com/go/compute/metadata"
"go4.org/jsonconfig"
)
// StatusHandler publishes server status information.
type StatusHandler struct {
prefix string
handlerFinder blobserver.FindHandlerByTyper
}
func init() {
blobserver.RegisterHandlerConstructor("status", newStatusFromConfig)
}
var _ blobserver.HandlerIniter = (*StatusHandler)(nil)
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) InitHandler(hl blobserver.FindHandlerByTyper) error {
_, h, err := hl.FindHandlerByType("search")
if err == blobserver.ErrHandlerTypeNotFound {
return nil
}
if err != nil {
return err
}
go func() {
var lastSend *status
for {
cur := sh.currentStatus()
if reflect.DeepEqual(cur, lastSend) {
// TODO: something better. get notified on interesting events.
time.Sleep(10 * time.Second)
continue
}
lastSend = cur
js, _ := json.MarshalIndent(cur, "", " ")
h.(*search.Handler).SendStatusUpdate(js)
}
}()
return nil
}
func (sh *StatusHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
suffix := httputil.PathSuffix(req)
if suffix == "restart" {
sh.serveRestart(rw, req)
return
}
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.", http.StatusNotFound)
}
}
type status struct {
Version string `json:"version"`
GoInfo string `json:"goInfo"`
Errors []camtypes.StatusError `json:"errors,omitempty"`
Sync map[string]syncStatus `json:"sync"`
Storage map[string]storageStatus `json:"storage"`
importerRoot string
rootPrefix string
ImporterAccounts interface{} `json:"importerAccounts"`
}
func (st *status) addError(msg, url string) {
st.Errors = append(st.Errors, camtypes.StatusError{
Error: msg,
URL: url,
})
}
func (st *status) isHandler(pfx string) bool {
if pfx == st.importerRoot {
return true
}
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:"approxBlobs,omitempty"`
ApproxBytes int `json:"approxBytes,omitempty"`
ImplStatus interface{} `json:"implStatus,omitempty"`
}
func (sh *StatusHandler) currentStatus() *status {
res := &status{
Version: buildinfo.Version(),
GoInfo: fmt.Sprintf("%s %s/%s cgo=%v", runtime.Version(), runtime.GOOS, runtime.GOARCH, cgoEnabled),
Storage: make(map[string]storageStatus),
Sync: make(map[string]syncStatus),
}
if v := os.Getenv("CAMLI_FAKE_STATUS_ERROR"); v != "" {
res.addError(v, "/status/#fakeerror")
}
_, hi, err := sh.handlerFinder.FindHandlerByType("root")
if err != nil {
res.addError(fmt.Sprintf("Error finding root handler: %v", err), "")
return res
}
rh := hi.(*RootHandler)
res.rootPrefix = rh.Prefix
if pfx, h, err := sh.handlerFinder.FindHandlerByType("importer"); err == nil {
res.importerRoot = pfx
as := h.(interface {
AccountsStatus() (interface{}, []camtypes.StatusError)
})
var errs []camtypes.StatusError
res.ImporterAccounts, errs = as.AccountsStatus()
res.Errors = append(res.Errors, errs...)
}
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())
}
func (sh *StatusHandler) googleCloudConsole() (string, error) {
if !env.OnGCE() {
return "", errors.New("not on GCE")
}
projID, err := metadata.ProjectID()
if err != nil {
return "", fmt.Errorf("Error getting project ID: %v", err)
}
return "https://console.cloud.google.com/compute/instances?project=" + projID, nil
}
var quotedPrefix = regexp.MustCompile(`[;"]/(\S+?/)[&"]`)
func (sh *StatusHandler) serveStatusHTML(rw http.ResponseWriter, req *http.Request) {
st := sh.currentStatus()
f := func(p string, a ...interface{}) {
if len(a) == 0 {
io.WriteString(rw, p)
} else {
fmt.Fprintf(rw, p, a...)
}
}
f("<html><head><title>camlistored status</title></head>")
f("<body>")
f("<h1>camlistored status</h1>")
f("<h2>Versions</h2><ul>")
var envStr string
if env.OnGCE() {
envStr = " (on GCE)"
}
f("<li><b>Camlistore</b>: %s%s</li>", html.EscapeString(buildinfo.Version()), envStr)
f("<li><b>Go</b>: %s/%s %s, cgo=%v</li>", runtime.GOOS, runtime.GOARCH, runtime.Version(), cgoEnabled)
f("<li><b>djpeg</b>: %s", html.EscapeString(buildinfo.DjpegStatus()))
f("</ul>")
f("<h2>Logs</h2><ul>")
f(" <li><a href='/debug/config'>/debug/config</a> - server config</li>\n")
if env.OnGCE() {
f(" <li><a href='/debug/logs/camlistored'>camlistored logs on Google Cloud Logging</a></li>\n")
f(" <li><a href='/debug/logs/system'>system logs from Google Compute Engine</a></li>\n")
}
f("</ul>")
f("<h2>Admin</h2>")
f("<ul>")
f(" <li><form method='post' action='restart' onsubmit='return confirm(\"Really restart now?\")'><button>restart server</button>")
f("<input type='checkbox' name='reindex'> reindex <input type='checkbox' name='recovery'> recovery</form></li>")
f("</form></li>")
if env.OnGCE() {
console, err := sh.googleCloudConsole()
if err != nil {
log.Printf("error getting Google Cloud Console URL: %v", err)
} else {
f(" <li><b>Updating:</b> When a new image for Camlistore on GCE is available, you can update by hitting \"Reset\" (or \"Stop\", then \"Start\") for your instance on your <a href='%s'>Google Cloud Console</a>.<br>Alternatively, you can ssh to your instance and restart the Camlistore service with: <b>sudo systemctl restart camlistored</b>.</li>", console)
}
}
f("</ul>")
f("<h2>Handlers</h2>")
f("<p>As JSON: <a href='status.json'>status.json</a>; and the <a href='%s?camli.mode=config'>discovery JSON</a>.</p>", st.rootPrefix)
f("<p>Not yet pretty HTML UI:</p>")
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<a href='%s'>%s</a>%s", in[:1], pfx, pfx, in[len(in)-1:])
}
return in
})
f("<pre>%s</pre>", jsh)
}
func (sh *StatusHandler) serveRestart(rw http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
http.Error(rw, "POST to restart", http.StatusMethodNotAllowed)
return
}
_, handlers := sh.handlerFinder.AllHandlers()
for _, h := range handlers {
ah, ok := h.(*app.Handler)
if !ok {
continue
}
log.Printf("Sending SIGINT to %s", ah.ProgramName())
err := ah.Quit()
if err != nil {
msg := fmt.Sprintf("Not restarting: couldn't interrupt app %s: %v", ah.ProgramName(), err)
log.Printf(msg)
http.Error(rw, msg, http.StatusInternalServerError)
return
}
}
reindex := (req.FormValue("reindex") == "on")
recovery := (req.FormValue("recovery") == "on")
log.Println("Restarting camlistored")
rw.Header().Set("Connection", "close")
http.Redirect(rw, req, sh.prefix, http.StatusFound)
if f, ok := rw.(http.Flusher); ok {
f.Flush()
}
osutil.RestartProcess(fmt.Sprintf("-reindex=%t", reindex), fmt.Sprintf("-recovery=%t", recovery))
}
var cgoEnabled bool
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