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status.go
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status.go
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// Copyright (c) 2016 Western Digital Corporation or its affiliates. All rights reserved.
// SPDX-License-Identifier: MIT
package master
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"net/http"
"time"
sigar "github.com/cloudfoundry/gosigar"
log "github.com/golang/glog"
)
const statusTemplateStr = `
<!doctype html>
<html lang="en">
<head>
<title>blb master status</title>
<style>
caption {
caption-side: top;
text-align: left;
font-weight: bold;
}
table.status {
border-collapse: collapse;
}
table.status td {
border: 1px solid #DDD;
text-align: left;
padding-left: 8px;
padding-right: 8px;
padding-top: 4px;
padding-bottom: 4px;
}
table.status th {
border: 1px solid #DDD;
text-align: left;
padding: 8px;
background-color: #009900;
color: white;
}
table.status tr:nth-child(even) {background-color: #F2F2F2;}
table.status tr:hover {background-color: #DDD;}
table.curators th {
background-color: #3399FF;
}
</style>
</head>
<body>
<h3>
{{if .JobName}}
{{.JobName}}
{{else}}
blb-master
{{end}}
{{if ne .LeaderAddr .Cfg.Addr}} / not the leader, data below will be stale! {{end}}
</h3>
<table>
<tr>
<td>Addr:</td>
<td><a href="http://{{.Cfg.Addr}}">{{.Cfg.Addr}}</a></td>
</tr>
<tr>
<td>Master leader address:</td>
{{if .LeaderAddr}}
<td><a href="http://{{.LeaderAddr}}">{{.LeaderAddr}}</a></td>
{{else}}
<td>Unknown</td>
{{end}}
</tr>
<tr>
<td>Master cluster members:</td>
<td>
{{range .Members}}
<a href="http://{{.}}">{{.}}</a> 
{{end}}
</td>
</tr>
<tr>
<td>Raft term:</td>
<td>{{.RaftTerm}}</td>
</tr>
<tr>
<td>Free memory:</td>
<td>{{.FreeMem}} / {{.TotalMem}} mb</td>
</tr>
<tr>
<td>Last reboot:</td>
<td>{{.Reboot}}</td>
</tr>
<tr>
<td>Set logging level:</td>
<td>
<form action="/loglevel" target="levelframe" method="get">
<input type="radio" name="v" value="TRACE"> TRACE
<input type="radio" name="v" value="INFO" checked> INFO
<input type="radio" name="v" value="ERROR"> ERROR
<input type="submit" value="Apply">
<iframe src="/loglevel" name="levelframe" width=200 height=40></iframe>
</form>
</td>
</tr>
</table>
<br>
Show logs:
<form action="/logs" target="logsframe" method="get">
<input type="radio" name="v" value="TRACE"> TRACE
<input type="radio" name="v" value="INFO" checked> INFO
<input type="radio" name="v" value="ERROR"> ERROR
| Max age: <input name="from" type="text" value="30s">
| Regex: <input name="pattern" type="text">
<input type="submit" value="Apply">
</form>
<br>
<iframe src="/logs?from=30s" name="logsframe" width=100% height=40%></iframe>
<br>
<br>
<table class="status">
<caption>Control RPC Metrics</caption>
<tr>
<th>Metric</th>
<th>Stats</th>
</tr>
{{range $k, $v := .CtlRPC}}
<tr>
<td>{{$k}}</td>
<td>{{$v}}</td>
</tr>
{{end}}
</table>
<br>
<hr></hr>
<table class="status">
<caption>Service RPC Metrics</caption>
<tr>
<th>Metric</th>
<th>Stats</th>
</tr>
{{range $k, $v := .SrvRPC}}
<tr>
<td>{{$k}}</td>
<td>{{$v}}</td>
</tr>
{{end}}
</table>
<br>
<hr></hr>
<table class="status curators">
<caption>Curators</caption>
<tr>
<th>ID</th>
<th>Status Page</th>
<th>Last HB</th>
<th>New Partition Quota</th>
</tr>
{{range .Curators}}
<tr>
<td>{{.ID}}</td>
<td><a href="http://{{.Addr}}">{{.Addr}}</a></td>
<td>{{.LastHeartbeat}}</td>
<td>{{.NewPartitionQuota}}</td>
</tr>
{{end}}
</table>
<br>
<hr></hr>
<table class="status curators">
<caption>Tractservers</caption>
<tr>
<th>ID</th>
<th>Status Page</th>
<th>Last HB</th>
</tr>
{{range .Tractservers}}
<tr>
<td>{{.ID}}</td>
<td><a href="http://{{.Addr}}">{{.Addr}}</a></td>
<td>{{.LastHeartbeat}}</td>
</tr>
{{end}}
</table>
status update time: {{.Now}}
</body>
</html>
`
// StatusData includes master status info.
type StatusData struct {
JobName string
Cfg Config
LeaderAddr string
Members []string
RaftTerm uint64
FreeMem uint64
TotalMem uint64
Curators []CuratorInfo
Tractservers []TractserverInfo
Reboot time.Time
CtlRPC map[string]string
SrvRPC map[string]string
Now time.Time
}
const mb = 1024 * 1024
var (
// When was the last reboot?
reboot = time.Now()
// Status html template.
statusTemplate = template.Must(template.New("status_html").Parse(statusTemplateStr))
)
// statusHandler is called when somebody makes a http request to a status port.
// If the "Accept" header is set to be "application/json", it sends json encoded
// status; otherwise it sends html.
func (s *Server) statusHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
if r.Header.Get("Accept") == "application/json" {
s.handleJSON(w)
} else {
s.handleHTML(w)
}
}
// Generate status data.
func (s *Server) genStatus() StatusData {
// Pull memory info.
mem := sigar.Mem{}
if err := mem.Get(); nil != err {
log.Errorf("failed to get memory info: %s", err)
mem.ActualFree = 0
mem.Total = 0
}
// Pull curator status.
curators, tractservers := s.master.getHeartbeats()
// Prepare data.
return StatusData{
JobName: "master",
Cfg: s.cfg,
LeaderAddr: s.master.stateHandler.LeaderID(),
Members: s.master.stateHandler.GetClusterMembers(),
RaftTerm: s.master.stateHandler.GetTerm(),
FreeMem: mem.ActualFree / mb,
TotalMem: mem.Total / mb,
Curators: curators,
Tractservers: tractservers,
Reboot: reboot,
CtlRPC: s.ctlHandler.rpcStats(),
SrvRPC: s.srvHandler.rpcStats(),
Now: time.Now(),
}
}
func (s *Server) handleHTML(w http.ResponseWriter) {
var b bytes.Buffer
if err := statusTemplate.Execute(&b, s.genStatus()); err != nil {
e := fmt.Sprintf("failed to encode html status data: %s", err)
log.Errorf(e)
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(e))
return
}
w.Header().Set("Content-Type", "text/html")
w.Write(b.Bytes())
}
func (s *Server) handleJSON(w http.ResponseWriter) {
var b bytes.Buffer
if err := json.NewEncoder(&b).Encode(s.genStatus()); err != nil {
e := fmt.Sprintf("failed to encode json status data: %s", err)
log.Errorf(e)
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(e))
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(b.Bytes())
}