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package testutil
import (
"bytes"
"io"
"os"
"sync"
"testing"
"github.com/hashicorp/go-hclog"
)
func Logger(t testing.TB) hclog.InterceptLogger {
return LoggerWithOutput(t, NewLogBuffer(t))
}
func LoggerWithOutput(t testing.TB, output io.Writer) hclog.InterceptLogger {
return hclog.NewInterceptLogger(&hclog.LoggerOptions{
Name: t.Name(),
Level: hclog.Trace,
Output: output,
})
}
var sendTestLogsToStdout = os.Getenv("NOLOGBUFFER") == "1"
// NewLogBuffer returns an io.Writer which buffers all writes. When the test
// ends, t.Failed is checked. If the test has failed or has been run in verbose
// mode all log output is printed to stdout.
//
// Set the env var NOLOGBUFFER=1 to disable buffering, resulting in all log
// output being written immediately to stdout.
func NewLogBuffer(t CleanupT) io.Writer {
if sendTestLogsToStdout {
return os.Stdout
}
buf := &logBuffer{buf: new(bytes.Buffer)}
t.Cleanup(func() {
if t.Failed() || testing.Verbose() {
buf.Lock()
defer buf.Unlock()
buf.buf.WriteTo(os.Stdout)
}
})
return buf
}
type CleanupT interface {
Cleanup(f func())
Failed() bool
}
type logBuffer struct {
buf *bytes.Buffer
sync.Mutex
}
func (lb *logBuffer) Write(p []byte) (n int, err error) {
lb.Lock()
defer lb.Unlock()
return lb.buf.Write(p)
}
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