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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 testtrace
import (
"bytes"
"fmt"
"internal/trace/v2/raw"
"internal/txtar"
"io"
)
// ParseFile parses a test file generated by the testgen package.
func ParseFile(testPath string) (io.Reader, *Expectation, error) {
ar, err := txtar.ParseFile(testPath)
if err != nil {
return nil, nil, fmt.Errorf("failed to read test file for %s: %v", testPath, err)
}
if len(ar.Files) != 2 {
return nil, nil, fmt.Errorf("malformed test %s: wrong number of files", testPath)
}
if ar.Files[0].Name != "expect" {
return nil, nil, fmt.Errorf("malformed test %s: bad filename %s", testPath, ar.Files[0].Name)
}
if ar.Files[1].Name != "trace" {
return nil, nil, fmt.Errorf("malformed test %s: bad filename %s", testPath, ar.Files[1].Name)
}
tr, err := raw.NewTextReader(bytes.NewReader(ar.Files[1].Data))
if err != nil {
return nil, nil, fmt.Errorf("malformed test %s: bad trace file: %v", testPath, err)
}
var buf bytes.Buffer
tw, err := raw.NewWriter(&buf, tr.Version())
if err != nil {
return nil, nil, fmt.Errorf("failed to create trace byte writer: %v", err)
}
for {
ev, err := tr.ReadEvent()
if err == io.EOF {
break
}
if err != nil {
return nil, nil, fmt.Errorf("malformed test %s: bad trace file: %v", testPath, err)
}
if err := tw.WriteEvent(ev); err != nil {
return nil, nil, fmt.Errorf("internal error during %s: failed to write trace bytes: %v", testPath, err)
}
}
exp, err := ParseExpectation(ar.Files[0].Data)
if err != nil {
return nil, nil, fmt.Errorf("internal error during %s: failed to parse expectation %q: %v", testPath, string(ar.Files[0].Data), err)
}
return &buf, exp, nil
}