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5ac311e2a9
We use a third-party library "colorable" to translate VT100 color sequences into Windows console attribute-setting calls when Terraform is running on Windows. colorable is not concurrency-safe for multiple writes to the same console, because it writes to the console one character at a time and so two concurrent writers get their characters interleaved, creating unreadable garble. Here we wrap around it a synchronization mechanism to ensure that there can be only one Write call outstanding across both stderr and stdout, mimicking the usual behavior we expect (when stderr/stdout are a normal file handle) of each Write being completed atomically.
32 lines
637 B
Go
32 lines
637 B
Go
package main
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import (
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"io"
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"sync"
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)
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type synchronizedWriter struct {
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io.Writer
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mutex *sync.Mutex
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}
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// synchronizedWriters takes a set of writers and returns wrappers that ensure
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// that only one write can be outstanding at a time across the whole set.
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func synchronizedWriters(targets ...io.Writer) []io.Writer {
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mutex := &sync.Mutex{}
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ret := make([]io.Writer, len(targets))
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for i, target := range targets {
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ret[i] = &synchronizedWriter{
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Writer: target,
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mutex: mutex,
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}
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}
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return ret
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}
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func (w *synchronizedWriter) Write(p []byte) (int, error) {
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w.mutex.Lock()
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defer w.mutex.Unlock()
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return w.Writer.Write(p)
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}
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