/
trace_viewer.go
80 lines (71 loc) · 1.9 KB
/
trace_viewer.go
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// Copyright 2020 Nelson Elhage
//
// 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 trace
import (
"encoding/json"
"fmt"
"log"
"os"
"time"
"github.com/nelhage/llama/tracing"
)
type Event struct {
Pid int `json:"pid"`
Tid int `json:"tid"`
Ph string `json:"ph,omitempty"`
Name string `json:"name,omitempty"`
Cat string `json:"cat,omitempty"`
Id int `json:"id,omitempty"`
Ts int64 `json:"ts"`
Dur int64 `json:"dur,omitempty"`
Args map[string]interface{} `json:"args,omitempty"`
}
func (c *TraceCommand) WriteTraceViewer(spans []tracing.Span, trees []*TraceTree) error {
fh, err := os.Create(c.traceViewer)
if err != nil {
return err
}
defer fh.Close()
var minTs time.Time
for _, span := range spans {
if minTs.IsZero() || span.Start.Before(minTs) {
minTs = span.Start
}
}
var events []Event
for i, tree := range trees {
w := walker{
start: minTs,
pid: 1,
tid: 1 + i,
events: events,
}
w.events = append(w.events, Event{
Pid: w.pid,
Tid: w.tid,
Ph: "X",
Ts: tree.span.Start.Sub(minTs).Microseconds(),
Dur: tree.span.Duration.Microseconds(),
Name: tree.span.Name,
})
w.walk(tree, c.depth)
events = w.events
}
out, err := json.MarshalIndent(&events, "", " ")
if err != nil {
log.Fatalf("marshal: %v", err)
}
fmt.Fprintf(fh, "%s\n", out)
return nil
}