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interactive.go
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interactive.go
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// Copyright 2013, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package worker
import (
"fmt"
"html/template"
"net/http"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/acl"
"github.com/youtube/vitess/go/vt/servenv"
"golang.org/x/net/context"
)
const indexHTML = `
<!DOCTYPE html>
<head>
<title>Worker Action Index</title>
</head>
<body>
<h1>Worker Action Index</h1>
{{range $i, $group := . }}
<li><a href="/{{$group.Name}}">{{$group.Name}}</a>: {{$group.Description}}.</li>
{{end}}
</body>
`
const subIndexHTML = `
{{$name := .Name}}
<!DOCTYPE html>
<head>
<title>{{$name}} Index</title>
</head>
<body>
<h1>{{$name}} Index</h1>
<p>{{.Description}}</p>
{{range $i, $cmd := .Commands }}
<li><a href="{{$name}}/{{$cmd.Name}}">{{$cmd.Name}}</a>: {{$cmd.Help}}.</li>
{{end}}
</body>
`
func httpError(w http.ResponseWriter, format string, args ...interface{}) {
log.Errorf(format, args)
http.Error(w, fmt.Sprintf(format, args), http.StatusInternalServerError)
}
func mustParseTemplate(name, contents string) *template.Template {
t, err := template.New(name).Parse(contents)
if err != nil {
// An invalid template here is a programming error.
panic(fmt.Sprintf("cannot parse %v template: %v", name, err))
}
return t
}
func executeTemplate(w http.ResponseWriter, t *template.Template, data interface{}) {
if err := t.Execute(w, data); err != nil {
httpError(w, "error executing template", err)
}
}
// InitInteractiveMode installs webserver handlers for each known command.
func (wi *Instance) InitInteractiveMode() {
indexTemplate := mustParseTemplate("index", indexHTML)
subIndexTemplate := mustParseTemplate("subIndex", subIndexHTML)
// toplevel menu
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if err := acl.CheckAccessHTTP(r, acl.ADMIN); err != nil {
acl.SendError(w, err)
return
}
executeTemplate(w, indexTemplate, commands)
})
// command group menus
for _, cg := range commands {
// keep a local copy of the Command pointer for the
// closure.
pcg := cg
http.HandleFunc("/"+cg.Name, func(w http.ResponseWriter, r *http.Request) {
if err := acl.CheckAccessHTTP(r, acl.ADMIN); err != nil {
acl.SendError(w, err)
return
}
executeTemplate(w, subIndexTemplate, pcg)
})
for _, c := range cg.Commands {
// keep a local copy of the Command pointer for the closure.
pc := c
http.HandleFunc("/"+cg.Name+"/"+c.Name, func(w http.ResponseWriter, r *http.Request) {
if err := acl.CheckAccessHTTP(r, acl.ADMIN); err != nil {
acl.SendError(w, err)
return
}
ctx := context.Background()
wrk, template, data, err := pc.Interactive(ctx, wi, wi.wr, w, r)
if err != nil {
httpError(w, "%s", err)
} else if template != nil && data != nil {
executeTemplate(w, template, data)
return
}
if wrk == nil {
httpError(w, "Internal server error. Command: %s did not return correct response.", c.Name)
return
}
if _, err := wi.setAndStartWorker(wrk, wi.wr); err != nil {
httpError(w, "Could not set %s worker: %s", c.Name, err)
return
}
http.Redirect(w, r, servenv.StatusURLPath(), http.StatusTemporaryRedirect)
})
}
}
log.Infof("Interactive mode ready")
}