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tstest: document PanicOnLog

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This commit is contained in:
Brad Fitzpatrick 2020-05-14 10:05:32 -07:00
parent e6d0c92b1d
commit 5ec7ac1d02
1 changed files with 8 additions and 6 deletions
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14
tstest/log.go
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@ -29,13 +29,15 @@ func UnfixLogs(t *testing.T) {
defer log.SetOutput(os.Stderr) defer log.SetOutput(os.Stderr)
} }
type panicLogWriter struct { type panicLogWriter struct{}
}
func (panicLogWriter) Write(b []byte) (int, error) {
func (w *panicLogWriter) Write(b []byte) (int, error) { panic("please use tailscale.com/logger.Logf instead of the log package")
panic("please use tailscale.com/logger.Logf instead of the log module")
} }
// PanicOnLog modifies the standard library log package's default output to
// an io.Writer that panics, to root out code that's not plumbing their logging
// through explicit tailscale.com/logger.Logf paths.
func PanicOnLog() { func PanicOnLog() {
log.SetOutput(&panicLogWriter{}) log.SetOutput(panicLogWriter{})
} }