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throttlerlogz.go
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throttlerlogz.go
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/*
Copyright 2017 Google Inc.
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 agreedto 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 throttler
import (
"fmt"
"html/template"
"io"
"net/http"
"strings"
"time"
"vitess.io/vitess/go/vt/logz"
)
const logHeaderHTML = `
<style>
table.gridtable th {
/* Override the nowrap default to avoid that the table overflows. */
white-space: normal;
}
</style>
<thead>
<tr>
<th>Now</th>
<th>Rate Change</th>
<th>Old Rate</th>
<th>New Rate</th>
<th>Tablet</th>
<th>Lag</th>
<th>Last Change</th>
<th>Actual Rate</th>
<th>Good/​Bad?</th>
<th>If Skipped</th>
<th>Highest Good</th>
<th>Lowest Bad</th>
<th>Old State</th>
<th>Tested State</th>
<th>New State</th>
<th>Lag Before</th>
<th>Recorded Ago</th>
<th>Master Rate</th>
<th>Slave Rate</th>
<th>Old Backlog</th>
<th>New Backlog</th>
<th>Reason</th>
</tr>
</thead>
`
const logEntryHTML = `
<tr class="{{.ColorLevel}}">
<td>{{.Now.Format "15:04:05"}}</td>
<td>{{.RateChange}}</td>
<td>{{.OldRate}}</td>
<td>{{.NewRate}}</td>
<td>{{.Alias}}</td>
<td>{{.LagRecordNow.Stats.SecondsBehindMaster}}s</td>
<td>{{.TimeSinceLastRateChange}}</td>
<td>{{.CurrentRate}}</td>
<td>{{.GoodOrBad}}</td>
<td>{{.MemorySkipReason}}</td>
<td>{{.HighestGood}}</td>
<td>{{.LowestBad}}</td>
<td>{{.OldState}}</td>
<td>{{.TestedState}}</td>
<td>{{.NewState}}</td>
<td>{{.LagBefore}}</td>
<td>{{.AgeOfBeforeLag}}</td>
<td>{{.MasterRate}}</td>
<td>{{.GuessedSlaveRate}}</td>
<td>{{.GuessedSlaveBacklogOld}}</td>
<td>{{.GuessedSlaveBacklogNew}}</td>
<td>{{.Reason}}</td>
</tr>
`
const logFooterHTML = `
{{.Count}} lag records spanning the last {{.TimeSpan}} minutes are displayed.
`
var (
logEntryTemplate = template.Must(template.New("logEntry").Parse(logEntryHTML))
logFooterTemplate = template.Must(template.New("logFooter").Parse(logFooterHTML))
)
func init() {
http.HandleFunc("/throttlerlogz/", func(w http.ResponseWriter, r *http.Request) {
throttlerlogzHandler(w, r, GlobalManager)
})
}
func throttlerlogzHandler(w http.ResponseWriter, r *http.Request, m *managerImpl) {
// Longest supported URL: /throttlerlogz/<name>
parts := strings.SplitN(r.URL.Path, "/", 3)
if len(parts) != 3 {
errMsg := fmt.Sprintf("invalid /throttlerlogz path: %q expected paths: /throttlerlogz/ or /throttlerlogz/<throttler name>", r.URL.Path)
http.Error(w, errMsg, http.StatusInternalServerError)
return
}
name := parts[2]
if name == "" {
// If no name is given, redirect to the list of throttlers at /throttlerz.
http.Redirect(w, r, "/throttlerz", http.StatusTemporaryRedirect)
return
}
showThrottlerLog(w, m, name)
}
func showThrottlerLog(w http.ResponseWriter, m *managerImpl, name string) {
results, err := m.Log(name)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
logz.StartHTMLTable(w)
if _, err := io.WriteString(w, logHeaderHTML); err != nil {
panic(fmt.Sprintf("failed to execute logHeader template: %v", err))
}
for _, r := range results {
// Color based on max(tested state, new state).
state := r.TestedState
if stateGreater(r.NewState, state) {
state = r.NewState
}
var colorLevel string
switch state {
case stateIncreaseRate:
colorLevel = "low"
case stateDecreaseAndGuessRate:
colorLevel = "medium"
case stateEmergency:
colorLevel = "high"
}
data := struct {
result
ColorLevel string
}{r, colorLevel}
if err := logEntryTemplate.Execute(w, data); err != nil {
panic(fmt.Sprintf("failed to execute logEntry template: %v", err))
}
}
logz.EndHTMLTable(w)
// Print footer.
count := len(results)
var d time.Duration
if count > 0 {
d = results[0].Now.Sub(results[count-1].Now)
}
if err := logFooterTemplate.Execute(w, map[string]interface{}{
"Count": count,
"TimeSpan": fmt.Sprintf("%.1f", d.Minutes()),
}); err != nil {
panic(fmt.Sprintf("failed to execute logFooter template: %v", err))
}
}