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txlogz.go
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txlogz.go
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/*
Copyright 2019 The Vitess 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 tabletserver
import (
"fmt"
"html/template"
"io"
"net/http"
"time"
"vitess.io/vitess/go/acl"
"vitess.io/vitess/go/streamlog"
"vitess.io/vitess/go/vt/callerid"
"vitess.io/vitess/go/vt/log"
"vitess.io/vitess/go/vt/logz"
"vitess.io/vitess/go/vt/vttablet/tabletserver/tabletenv"
querypb "vitess.io/vitess/go/vt/proto/query"
vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
)
var (
txlogzHeader = []byte(`
<thead>
<tr>
<th>Transaction id</th>
<th>Effective caller</th>
<th>Immediate caller</th>
<th>Start</th>
<th>End</th>
<th>Duration</th>
<th>Decision</th>
<th>Statements</th>
</tr>
</thead>
`)
txlogzFuncMap = template.FuncMap{
"stampMicro": func(t time.Time) string { return t.Format(time.StampMicro) },
"getEffectiveCaller": func(e *vtrpcpb.CallerID) string { return callerid.GetPrincipal(e) },
"getImmediateCaller": func(i *querypb.VTGateCallerID) string { return callerid.GetUsername(i) },
}
txlogzTmpl = template.Must(template.New("example").Funcs(txlogzFuncMap).Parse(`
<tr class="{{.ColorLevel}}">
<td>{{.TransactionID}}</td>
<td>{{.EffectiveCallerID | getEffectiveCaller}}</td>
<td>{{.ImmediateCallerID | getImmediateCaller}}</td>
<td>{{.StartTime | stampMicro}}</td>
<td>{{.EndTime | stampMicro}}</td>
<td>{{.Duration}}</td>
<td>{{.Conclusion}}</td>
<td>
{{ range .Queries }}
{{.}}<br>
{{ end}}
</td>
</tr>`))
)
func init() {
http.HandleFunc("/txlogz", txlogzHandler)
}
// txlogzHandler serves a human readable snapshot of the
// current transaction log.
// Endpoint: /txlogz?timeout=%d&limit=%d
// timeout: the txlogz will keep dumping transactions until timeout
// limit: txlogz will keep dumping transactions until it hits the limit
func txlogzHandler(w http.ResponseWriter, req *http.Request) {
if err := acl.CheckAccessHTTP(req, acl.DEBUGGING); err != nil {
acl.SendError(w, err)
return
}
if *streamlog.RedactDebugUIQueries {
io.WriteString(w, `
<!DOCTYPE html>
<html>
<body>
<h1>Redacted</h1>
<p>/txlogz has been redacted for your protection</p>
</body>
</html>
`)
return
}
timeout, limit := parseTimeoutLimitParams(req)
ch := tabletenv.TxLogger.Subscribe("txlogz")
defer tabletenv.TxLogger.Unsubscribe(ch)
logz.StartHTMLTable(w)
defer logz.EndHTMLTable(w)
w.Write(txlogzHeader)
tmr := time.NewTimer(timeout)
defer tmr.Stop()
for i := 0; i < limit; i++ {
select {
case out := <-ch:
txc, ok := out.(*StatefulConnection)
if !ok {
err := fmt.Errorf("unexpected value in %s: %#v (expecting value of type %T)", tabletenv.TxLogger.Name(), out, &StatefulConnection{})
io.WriteString(w, `<tr class="error">`)
io.WriteString(w, err.Error())
io.WriteString(w, "</tr>")
log.Error(err)
continue
}
// not all StatefulConnections contain transactions
if txc.txProps != nil {
writeTransactionData(w, txc)
}
case <-tmr.C:
return
}
}
}
func writeTransactionData(w http.ResponseWriter, txc *StatefulConnection) {
props := txc.txProps
var level string
duration := props.EndTime.Sub(props.StartTime).Seconds()
if duration < 0.1 {
level = "low"
} else if duration < 1.0 {
level = "medium"
} else {
level = "high"
}
tmplData := struct {
*StatefulConnection
Duration float64
ColorLevel string
}{txc, duration, level}
if err := txlogzTmpl.Execute(w, tmplData); err != nil {
log.Errorf("txlogz: couldn't execute template: %v", err)
}
}