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perfetto.go
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perfetto.go
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// Copyright (C) 2019 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 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 capture
import (
"bufio"
"bytes"
"context"
"io"
"io/ioutil"
"github.com/google/gapid/core/app/analytics"
"github.com/google/gapid/gapis/perfetto"
"github.com/google/gapid/gapis/service"
"github.com/google/gapid/gapis/service/path"
"github.com/pkg/errors"
)
const (
// maxSearchBytes is the maximum number of bytes at the beginning of the
// file to search for the Perfetto magic UUID.
maxSearchBytes = 256
)
// perfettoUUID is the magic UUID found near the beginning of a Perfetto trace.
var perfettoUUID = []byte{
0x82, 0x47, 0x7a, 0x76, 0xb2, 0x8d, 0x42, 0xba, 0x81, 0xdc, 0x33, 0x32, 0x6d, 0x57, 0xa0, 0x79,
}
type PerfettoCapture struct {
name string
Processor *perfetto.Processor
}
func (c *PerfettoCapture) Name() string {
return c.name
}
func (c *PerfettoCapture) Service(ctx context.Context, p *path.Capture) *service.Capture {
return &service.Capture{
Type: service.TraceType_Perfetto,
Name: c.name,
}
}
func (c *PerfettoCapture) Export(ctx context.Context, w io.Writer) error {
return errors.New("export not supported")
}
func isPerfettoTraceFormat(in *bufio.Reader) bool {
buf, _ := in.Peek(maxSearchBytes)
return bytes.Contains(buf, perfettoUUID)
}
func deserializePerfettoTrace(ctx context.Context, r *Record, in io.Reader) (Capture, error) {
stopTiming := analytics.SendTiming("perfetto", "deserialize")
defer stopTiming(analytics.Size(len(r.Data)))
data, err := ioutil.ReadAll(in)
if err != nil {
return nil, err
}
p, err := perfetto.NewProcessor(ctx, data)
if err != nil {
return nil, err
}
return &PerfettoCapture{r.Name, p}, nil
}