// 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 (
"fmt"
"io"
"internal/trace/version"
)
// TextWriter emits the text format of a trace.
type TextWriter struct {
w io.Writer
v version.Version
}
// NewTextWriter creates a new write for the trace text format.
func NewTextWriter(w io.Writer, v version.Version) (*TextWriter, error) {
_, err := fmt.Fprintf(w, "Trace Go1.%d\n", v)
if err != nil {
return nil, err
}
return &TextWriter{w: w, v: v}, nil
}
// WriteEvent writes a single event to the stream.
func (w *TextWriter) 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.
_, err := fmt.Fprintln(w.w, e.String())
return err
}
