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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package raw
import (
"encoding/binary"
"fmt"
"io"
"internal/trace/v2/event"
"internal/trace/v2/version"
)
// Writer emits the wire format of a trace.
//
// It may not produce a byte-for-byte compatible trace from what is
// produced by the runtime, because it may be missing extra padding
// in the LEB128 encoding that the runtime adds but isn't necessary
// when you know the data up-front.
type Writer struct {
w io.Writer
buf []byte
v version.Version
specs []event.Spec
}
// NewWriter creates a new byte format writer.
func NewWriter(w io.Writer, v version.Version) (*Writer, error) {
_, err := version.WriteHeader(w, v)
return &Writer{w: w, v: v, specs: v.Specs()}, err
}
// WriteEvent writes a single event to the trace wire format stream.
func (w *Writer) WriteEvent(e Event) error {
// Check version.
if e.Version != w.v {
return fmt.Errorf("mismatched version between writer (go 1.%d) and event (go 1.%d)", w.v, e.Version)
}
// Write event header byte.
w.buf = append(w.buf, uint8(e.Ev))
// Write out all arguments.
spec := w.specs[e.Ev]
for _, arg := range e.Args[:len(spec.Args)] {
w.buf = binary.AppendUvarint(w.buf, arg)
}
if spec.IsStack {
frameArgs := e.Args[len(spec.Args):]
for i := 0; i < len(frameArgs); i++ {
w.buf = binary.AppendUvarint(w.buf, frameArgs[i])
}
}
// Write out the length of the data.
if spec.HasData {
w.buf = binary.AppendUvarint(w.buf, uint64(len(e.Data)))
}
// Write out varint events.
_, err := w.w.Write(w.buf)
w.buf = w.buf[:0]
if err != nil {
return err
}
// Write out data.
if spec.HasData {
_, err := w.w.Write(e.Data)
return err
}
return nil
}