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80 lines
2.2 KiB
80 lines
2.2 KiB
package log
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import (
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"sync"
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"testing"
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"github.com/rs/zerolog"
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)
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var (
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// reuse the same logger across all tests
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testingLoggerMtx = sync.Mutex{}
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testingLogger Logger
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)
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// TestingLogger returns a Logger which writes to STDOUT if test(s) are being
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// run with the verbose (-v) flag, NopLogger otherwise.
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//
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// NOTE:
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// - A call to NewTestingLogger() must be made inside a test (not in the init func)
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// because verbose flag only set at the time of testing.
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// - Repeated calls to this function within a single process will
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// produce a single test log instance, and while the logger is safe
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// for parallel use it it doesn't produce meaningful feedback for
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// parallel tests.
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func TestingLogger() Logger {
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testingLoggerMtx.Lock()
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defer testingLoggerMtx.Unlock()
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if testingLogger != nil {
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return testingLogger
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}
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if testing.Verbose() {
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testingLogger = MustNewDefaultLogger(LogFormatText, LogLevelDebug)
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} else {
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testingLogger = NewNopLogger()
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}
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return testingLogger
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}
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type testingWriter struct {
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t testing.TB
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}
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func (tw testingWriter) Write(in []byte) (int, error) {
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tw.t.Log(string(in))
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return len(in), nil
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}
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// NewTestingLogger converts a testing.T into a logging interface to
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// make test failures and verbose provide better feedback associated
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// with test failures. This logging instance is safe for use from
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// multiple threads, but in general you should create one of these
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// loggers ONCE for each *testing.T instance that you interact with.
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//
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// By default it collects only ERROR messages, or DEBUG messages in
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// verbose mode, and relies on the underlying behavior of testing.T.Log()
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func NewTestingLogger(t testing.TB) Logger {
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level := LogLevelError
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if testing.Verbose() {
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level = LogLevelDebug
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}
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return NewTestingLoggerWithLevel(t, level)
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}
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// NewTestingLoggerWithLevel creates a testing logger instance at a
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// specific level that wraps the behavior of testing.T.Log().
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func NewTestingLoggerWithLevel(t testing.TB, level string) Logger {
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logLevel, err := zerolog.ParseLevel(level)
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if err != nil {
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t.Fatalf("failed to parse log level (%s): %v", level, err)
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}
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return defaultLogger{
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Logger: zerolog.New(newSyncWriter(testingWriter{t})).Level(logLevel),
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}
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}
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