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debug.go
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debug.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package yarpc
import (
"html/template"
"io"
"log"
"net/http"
"sync"
"go.uber.org/yarpc/internal/introspection"
)
var (
dispatchersLock sync.RWMutex
dispatchers []*Dispatcher
)
func addDispatcherToDebugPages(disp *Dispatcher) {
dispatchersLock.Lock()
defer dispatchersLock.Unlock()
dispatchers = append(dispatchers, disp)
}
func removeDispatcherFromDebugPages(disp *Dispatcher) {
dispatchersLock.Lock()
defer dispatchersLock.Unlock()
for i, x := range dispatchers {
if x == disp {
copy(dispatchers[i:], dispatchers[i+1:])
dispatchers[len(dispatchers)-1] = nil
dispatchers = dispatchers[:len(dispatchers)-1]
break
}
}
}
func init() {
http.HandleFunc("/debug/yarpc", func(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
render(w, req)
})
}
func render(w io.Writer, req *http.Request) {
data := struct {
Dispatchers []introspection.DispatcherStatus
PackageVersions []introspection.PackageVersion
}{
PackageVersions: PackageVersions,
}
for _, disp := range dispatchers {
data.Dispatchers = append(data.Dispatchers, disp.Introspect())
}
if err := pageTmpl.ExecuteTemplate(w, "Page", data); err != nil {
log.Printf("yarpc/debug: Failed executing template: %v", err)
}
}
var pageTmpl = template.Must(template.New("Page").Funcs(template.FuncMap{}).Parse(pageHTML))
const pageHTML = `
<html>
<head>
<title>/debug/yarpc</title>
<style type="text/css">
body {
font-family: "Courier New", Courier, monospace;
}
table {
color:#333333;
border-width: 1px;
border-color: #3A3A3A;
border-collapse: collapse;
}
table th {
border-width: 1px;
padding: 8px;
border-style: solid;
border-color: #3A3A3A;
background-color: #B3B3B3;
}
table td {
border-width: 1px;
padding: 8px;
border-style: solid;
border-color: #3A3A3A;
background-color: #ffffff;
}
header::after {
content: "";
clear: both;
display: table;
}
h1 {
width: 40%;
float: left;
margin: 0;
}
div.dependencies {
width: 60%;
float: left;
font-size: small;
text-align: right;
}
</style>
</head>
<body>
<header>
<h1>/debug/yarpc</h1>
<div class="dependencies">
{{range .PackageVersions}}
<span>{{.Name}}={{.Version}}</span>
{{end}}
</div>
</header>
{{range .Dispatchers}}
<hr />
<h2>Dispatcher "{{.Name}}" <small>({{.ID}})</small></h2>
<table>
<tr>
<th>Procedure</th>
<th>Encoding</th>
<th>Signature</th>
<th>RPC Type</th>
</tr>
{{range .Procedures}}
<tr>
<td>{{.Name}}</td>
<td>{{.Encoding}}</td>
<td>{{.Signature}}</td>
<td>{{.RPCType}}</td>
</tr>
{{end}}
</table>
<h3>Inbounds</h3>
<table>
<tr>
<th>Transport</th>
<th>Endpoint</th>
<th>State</th>
</tr>
{{range .Inbounds}}
<tr>
<td>{{.Transport}}</td>
<td>{{.Endpoint}}</td>
<td>{{.State}}</td>
</tr>
{{end}}
</table>
<h3>Outbounds</h3>
<table>
<thead>
<tr>
<th>Outbound Key</th>
<th>Service</th>
<th>Transport</th>
<th>RPC Type</th>
<th>Endpoint</th>
<th>State</th>
<th colspan="3">Chooser</th>
</tr>
<tr>
<th></th>
<th></th>
<th></th>
<th></th>
<th></th>
<th>Name</th>
<th>State</th>
<th>Peers</th>
</tr>
</thead>
<tbody>
{{range .Outbounds}}
<tr>
<td>{{.OutboundKey}}</td>
<td>{{.Service}}</td>
<td>{{.Transport}}</td>
<td>{{.RPCType}}</td>
<td>{{.Endpoint}}</td>
<td>{{.State}}</td>
<td>{{.Chooser.Name}}</td>
<td>{{.Chooser.State}}</td>
<td>
<ul>
{{range .Chooser.Peers}}
<li>{{.Identifier}} ({{.State}})</li>
{{end}}
</ul>
</td>
</tr>
</tbody>
{{end}}
</table>
{{end}}
</body>
</html>
`