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queryz.go
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queryz.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"
"html/template"
"net/http"
"sort"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/acl"
"github.com/youtube/vitess/go/vt/tabletserver/planbuilder"
)
var (
queryzHeader = []byte(`<thead>
<tr>
<th>Query</th>
<th>Table</th>
<th>Plan</th>
<th>Reason</th>
<th>Count</th>
<th>Time</th>
<th>Rows</th>
<th>Errors</th>
<th>Time per query</th>
<th>Rows per query</th>
<th>Errors per query</th>
</tr>
</thead>
`)
queryzTmpl = template.Must(template.New("example").Parse(`
<tr class="{{.Color}}">
<td>{{.Query}}</td>
<td>{{.Table}}</td>
<td>{{.Plan}}</td>
<td>{{.Reason}}</td>
<td>{{.Count}}</td>
<td>{{.Time}}</td>
<td>{{.Rows}}</td>
<td>{{.Errors}}</td>
<td>{{.TimePQ}}</td>
<td>{{.RowsPQ}}</td>
<td>{{.ErrorsPQ}}</td>
</tr>
`))
)
// queryzRow is used for rendering query stats
// using go's template.
type queryzRow struct {
Query string
Table string
Plan planbuilder.PlanType
Reason planbuilder.ReasonType
Count int64
tm time.Duration
Rows int64
Errors int64
Color string
}
// Time returns the total time as a string.
func (qzs *queryzRow) Time() string {
return fmt.Sprintf("%.6f", float64(qzs.tm)/1e9)
}
func (qzs *queryzRow) timePQ() float64 {
return float64(qzs.tm) / (1e9 * float64(qzs.Count))
}
// TimePQ returns the time per query as a string.
func (qzs *queryzRow) TimePQ() string {
return fmt.Sprintf("%.6f", qzs.timePQ())
}
func (qzs *queryzRow) rowsPQ() float64 {
return float64(qzs.Rows) / float64(qzs.Count)
}
// RowsPQ returns the row count per query as a string.
func (qzs *queryzRow) RowsPQ() string {
return fmt.Sprintf("%.6f", qzs.rowsPQ())
}
// ErrorsPQ returns the error count per query as a string.
func (qzs *queryzRow) ErrorsPQ() string {
return fmt.Sprintf("%.6f", float64(qzs.Errors)/float64(qzs.Count))
}
type queryzSorter struct {
rows []*queryzRow
less func(row1, row2 *queryzRow) bool
}
func (sorter *queryzSorter) Len() int {
return len(sorter.rows)
}
func (sorter *queryzSorter) Swap(i, j int) {
sorter.rows[i], sorter.rows[j] = sorter.rows[j], sorter.rows[i]
}
func (sorter *queryzSorter) Less(i, j int) bool {
return sorter.less(sorter.rows[i], sorter.rows[j])
}
func queryzHandler(si *SchemaInfo, w http.ResponseWriter, r *http.Request) {
if err := acl.CheckAccessHTTP(r, acl.DEBUGGING); err != nil {
acl.SendError(w, err)
return
}
startHTMLTable(w)
defer endHTMLTable(w)
w.Write(queryzHeader)
keys := si.queries.Keys()
sorter := queryzSorter{
rows: make([]*queryzRow, 0, len(keys)),
less: func(row1, row2 *queryzRow) bool {
return row1.timePQ() > row2.timePQ()
},
}
for _, v := range si.queries.Keys() {
plan := si.peekQuery(v)
if plan == nil {
continue
}
Value := &queryzRow{
Query: wrappable(v),
Table: plan.TableName,
Plan: plan.PlanID,
Reason: plan.Reason,
}
Value.Count, Value.tm, Value.Rows, Value.Errors = plan.Stats()
var timepq time.Duration
if Value.Count != 0 {
timepq = time.Duration(int64(Value.tm) / Value.Count)
}
if timepq < 10*time.Millisecond {
Value.Color = "low"
} else if timepq < 100*time.Millisecond {
Value.Color = "medium"
} else {
Value.Color = "high"
}
sorter.rows = append(sorter.rows, Value)
}
sort.Sort(&sorter)
for _, Value := range sorter.rows {
if err := queryzTmpl.Execute(w, Value); err != nil {
log.Errorf("queryz: couldn't execute template: %v", err)
}
}
}