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format.go
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format.go
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// Copyright 2016 The Cockroach 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 tracing
import (
"bytes"
"fmt"
"sort"
"strings"
"time"
opentracing "github.com/opentracing/opentracing-go"
otlog "github.com/opentracing/opentracing-go/log"
)
type traceLogData struct {
opentracing.LogRecord
depth int
}
type traceLogs []traceLogData
func (l traceLogs) Len() int {
return len(l)
}
func (l traceLogs) Less(i, j int) bool {
return l[i].Timestamp.Before(l[j].Timestamp)
}
func (l traceLogs) Swap(i, j int) {
l[i], l[j] = l[j], l[i]
}
// FormatRecordedSpans formats the given spans for human consumption, showing the
// relationship using nesting and times as both relative to the previous event
// and cumulative.
//
// TODO(andrei): this should be unified with
// SessionTracing.GenerateSessionTraceVTable.
func FormatRecordedSpans(spans []RecordedSpan) string {
m := make(map[uint64]*RecordedSpan)
for i, sp := range spans {
m[sp.SpanID] = &spans[i]
}
var depth func(uint64) int
depth = func(parentID uint64) int {
p := m[parentID]
if p == nil {
return 0
}
return depth(p.ParentSpanID) + 1
}
var logs traceLogs
var start time.Time
for _, sp := range spans {
if sp.ParentSpanID == 0 {
start = sp.StartTime
}
d := depth(sp.ParentSpanID)
// Issue a log with the operation name. Include any tags.
lr := opentracing.LogRecord{
Timestamp: sp.StartTime,
Fields: []otlog.Field{otlog.String("operation", sp.Operation)},
}
if len(sp.Tags) > 0 {
tags := make([]string, 0, len(sp.Tags))
for k := range sp.Tags {
tags = append(tags, k)
}
sort.Strings(tags)
for _, k := range tags {
lr.Fields = append(lr.Fields, otlog.String(k, sp.Tags[k]))
}
}
logs = append(logs, traceLogData{LogRecord: lr, depth: d})
for _, l := range sp.Logs {
lr := opentracing.LogRecord{
Timestamp: l.Time,
Fields: make([]otlog.Field, len(l.Fields)),
}
for i, f := range l.Fields {
lr.Fields[i] = otlog.String(f.Key, f.Value)
}
logs = append(logs, traceLogData{LogRecord: lr, depth: d})
}
}
sort.Sort(logs)
var buf bytes.Buffer
last := start
for _, entry := range logs {
fmt.Fprintf(&buf, "% 10.3fms % 10.3fms%s",
1000*entry.Timestamp.Sub(start).Seconds(),
1000*entry.Timestamp.Sub(last).Seconds(),
strings.Repeat(" ", entry.depth+1))
for i, f := range entry.Fields {
if i != 0 {
buf.WriteByte(' ')
}
fmt.Fprintf(&buf, "%s:%v", f.Key(), f.Value())
}
buf.WriteByte('\n')
last = entry.Timestamp
}
return buf.String()
}