104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Package testlog creates a *log.Logger backed by *testing.T to ease logging
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// in tests. This allows logs from components being tested to only be printed
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// if the test fails (or the verbose flag is specified).
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package testlog
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import (
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"bytes"
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"io"
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"log"
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"os"
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hclog "github.com/hashicorp/go-hclog"
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)
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// UseStdout returns true if NOMAD_TEST_STDOUT=1 and sends logs to stdout.
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func UseStdout() bool {
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return os.Getenv("NOMAD_TEST_STDOUT") == "1"
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}
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// LogPrinter is the methods of testing.T (or testing.B) needed by the test
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// logger.
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type LogPrinter interface {
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Logf(format string, args ...interface{})
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}
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// writer implements io.Writer on top of a Logger.
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type writer struct {
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prefix string
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t LogPrinter
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}
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// Write to an underlying Logger. Never returns an error.
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func (w *writer) Write(p []byte) (n int, err error) {
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w.t.Logf("%s%s", w.prefix, p)
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return len(p), nil
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}
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// NewWriter creates a new io.Writer backed by a Logger.
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func NewWriter(t LogPrinter) io.Writer {
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if UseStdout() {
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return os.Stdout
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}
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return &writer{t: t}
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}
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// NewPrefixWriter creates a new io.Writer backed by a Logger with a custom
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// prefix per Write.
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func NewPrefixWriter(t LogPrinter, prefix string) io.Writer {
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if UseStdout() {
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return &prefixStdout{[]byte(prefix)}
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}
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return &writer{prefix, t}
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}
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// New returns a new test logger. See https://golang.org/pkg/log/#New
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func New(t LogPrinter, prefix string, flag int) *log.Logger {
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if UseStdout() {
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return log.New(os.Stdout, prefix, flag)
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}
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return log.New(&writer{t: t}, prefix, flag)
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}
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// WithPrefix returns a new test logger with the Lmicroseconds flag set.
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func WithPrefix(t LogPrinter, prefix string) *log.Logger {
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return New(t, prefix, log.Lmicroseconds)
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}
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// Logger returns a new test logger with the Lmicroseconds flag set and no
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// prefix.
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func Logger(t LogPrinter) *log.Logger {
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return WithPrefix(t, "")
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}
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//HCLogger returns a new test hc-logger.
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func HCLogger(t LogPrinter) hclog.Logger {
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opts := &hclog.LoggerOptions{
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Level: hclog.Trace,
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Output: NewWriter(t),
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IncludeLocation: true,
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}
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return hclog.New(opts)
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}
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type prefixStdout struct {
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prefix []byte
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}
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// Write to stdout with a prefix per call containing non-whitespace characters.
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func (w *prefixStdout) Write(p []byte) (int, error) {
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if len(p) == 0 {
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return 0, nil
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}
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// Skip prefix if only writing whitespace
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if len(bytes.TrimSpace(p)) > 0 {
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_, err := os.Stdout.Write(w.prefix)
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if err != nil {
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return 0, err
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}
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}
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return os.Stdout.Write(p)
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}
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