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querylogz.go
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querylogz.go
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// Copyright 2012, 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 tabletserver
import (
"fmt"
"io"
"net/http"
"strings"
"text/template"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/acl"
)
var (
querylogzHeader = []byte(`
<tr>
<th>Method</th>
<th>Context</th>
<th>Start</th>
<th>End</th>
<th>Duration</th>
<th>MySQL time</th>
<th>Conn wait</th>
<th>Plan</th>
<th>SQL</th>
<th>Queries</th>
<th>Sources</th>
<th>RowsAffected</th>
<th>Response Size</th>
<th>Cache Hits</th>
<th>Cache Misses</th>
<th>Cache Absent</th>
<th>Cache Invalidations</th>
<th>Transaction ID</th>
<th>Error</th>
</tr>
`)
querylogzFuncMap = template.FuncMap{
"stampMicro": func(t time.Time) string { return t.Format(time.StampMicro) },
"cssWrappable": wrappable,
"unquote": func(s string) string { return strings.Trim(s, "\"") },
}
querylogzTmpl = template.Must(template.New("example").Funcs(querylogzFuncMap).Parse(`
<tr class=".ColorLevel">
<td>{{.Method}}</td>
<td>{{.ContextHTML}}</td>
<td>{{.StartTime | stampMicro}}</td>
<td>{{.EndTime | stampMicro}}</td>
<td>{{.TotalTime.Seconds}}</td>
<td>{{.MysqlResponseTime.Seconds}}</td>
<td>{{.WaitingForConnection.Seconds}}</td>
<td>{{.PlanType}}</td>
<td>{{.OriginalSQL | unquote | cssWrappable}}</td>
<td>{{.NumberOfQueries}}</td>
<td>{{.FmtQuerySources}}</td>
<td>{{.RowsAffected}}</td>
<td>{{.SizeOfResponse}}</td>
<td>{{.CacheHits}}</td>
<td>{{.CacheMisses}}</td>
<td>{{.CacheAbsent}}</td>
<td>{{.CacheInvalidations}}</td>
<td>{{.TransactionID}}</td>
<td>{{.ErrorStr}}</td>
</tr>
`))
)
func init() {
http.HandleFunc("/querylogz", func(w http.ResponseWriter, r *http.Request) {
ch := StatsLogger.Subscribe("querylogz")
defer StatsLogger.Unsubscribe(ch)
querylogzHandler(ch, w, r)
})
}
// querylogzHandler serves a human readable snapshot of the
// current query log.
func querylogzHandler(ch chan interface{}, w http.ResponseWriter, r *http.Request) {
if err := acl.CheckAccessHTTP(r, acl.DEBUGGING); err != nil {
acl.SendError(w, err)
return
}
timeout, limit := parseTimeoutLimitParams(r)
startHTMLTable(w)
defer endHTMLTable(w)
w.Write(querylogzHeader)
tmr := time.NewTimer(timeout)
defer tmr.Stop()
for i := 0; i < limit; i++ {
select {
case out := <-ch:
select {
case <-tmr.C:
return
default:
}
stats, ok := out.(*LogStats)
if !ok {
err := fmt.Errorf("Unexpected value in %s: %#v (expecting value of type %T)", TxLogger.Name(), out, &LogStats{})
io.WriteString(w, `<tr class="error">`)
io.WriteString(w, err.Error())
io.WriteString(w, "</tr>")
log.Error(err)
continue
}
var level string
if stats.TotalTime().Seconds() < 0.01 {
level = "low"
} else if stats.TotalTime().Seconds() < 0.1 {
level = "medium"
} else {
level = "high"
}
tmplData := struct {
*LogStats
ColorLevel string
}{stats, level}
if err := querylogzTmpl.Execute(w, tmplData); err != nil {
log.Errorf("querylogz: couldn't execute template: %v", err)
}
case <-tmr.C:
return
}
}
}