go run_example_js 源码
golang run_example_js 代码
文件路径：/src/testing/run_example_js.go
// Copyright 2019 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.
//go:build js
package testing
import (
"fmt"
"io"
"os"
"strings"
"time"
)
// TODO(@musiol, @odeke-em): unify this code back into
// example.go when js/wasm gets an os.Pipe implementation.
func runExample(eg InternalExample) (ok bool) {
if *chatty {
fmt.Printf("=== RUN %s\n", eg.Name)
}
// Capture stdout to temporary file. We're not using
// os.Pipe because it is not supported on js/wasm.
stdout := os.Stdout
f := createTempFile(eg.Name)
os.Stdout = f
finished := false
start := time.Now()
// Clean up in a deferred call so we can recover if the example panics.
defer func() {
timeSpent := time.Since(start)
// Restore stdout, get output and remove temporary file.
os.Stdout = stdout
var buf strings.Builder
_, seekErr := f.Seek(0, os.SEEK_SET)
_, readErr := io.Copy(&buf, f)
out := buf.String()
f.Close()
os.Remove(f.Name())
if seekErr != nil {
fmt.Fprintf(os.Stderr, "testing: seek temp file: %v\n", seekErr)
os.Exit(1)
}
if readErr != nil {
fmt.Fprintf(os.Stderr, "testing: read temp file: %v\n", readErr)
os.Exit(1)
}
err := recover()
ok = eg.processRunResult(out, timeSpent, finished, err)
}()
// Run example.
eg.F()
finished = true
return
}
func createTempFile(exampleName string) *os.File {
for i := 0; ; i++ {
name := fmt.Sprintf("%s/go-example-stdout-%s-%d.txt", os.TempDir(), exampleName, i)
f, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
if err != nil {
if os.IsExist(err) {
continue
}
fmt.Fprintf(os.Stderr, "testing: open temp file: %v\n", err)
os.Exit(1)
}
return f
}
}
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