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refactor: extract Tracker to interface
Improve test coverage. Update #6
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package tail | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| "github.com/go-faster/errors" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| "go.uber.org/zap/zaptest" | ||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| type wrapTracker struct { | ||
| file func(name string) | ||
| create func(name string) | ||
| t Tracker | ||
| } | ||
|
|
||
| func (w wrapTracker) watchFile(name string) error { | ||
| if w.file != nil { | ||
| defer w.file(name) | ||
| } | ||
| return w.t.watchFile(name) | ||
| } | ||
|
|
||
| func (w wrapTracker) watchCreate(name string) error { | ||
| if w.create != nil { | ||
| defer w.create(name) | ||
| } | ||
| return w.t.watchCreate(name) | ||
| } | ||
|
|
||
| func (w wrapTracker) removeWatchName(name string) error { | ||
| return w.t.removeWatchName(name) | ||
| } | ||
|
|
||
| func (w wrapTracker) removeWatchCreate(name string) error { | ||
| return w.t.removeWatchCreate(name) | ||
| } | ||
|
|
||
| func (w wrapTracker) listenEvents(name string) <-chan fsnotify.Event { | ||
| return w.t.listenEvents(name) | ||
| } | ||
|
|
||
| func TestCreateAfterWatch(t *testing.T) { | ||
| lg := zaptest.NewLogger(t) | ||
| g, ctx := errgroup.WithContext(context.Background()) | ||
| name := filepath.Join(t.TempDir(), "foo.txt") | ||
|
|
||
| const lines = 10 | ||
|
|
||
| started := make(chan struct{}) | ||
| g.Go(func() error { | ||
| select { | ||
| case <-started: | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| } | ||
|
|
||
| f, err := os.Create(name) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for i := 0; i < lines; i++ { | ||
| if _, err := fmt.Fprintln(f, line); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return f.Close() | ||
| }) | ||
|
|
||
| tailer := File(name, Config{ | ||
| NotifyTimeout: notifyTimeout, | ||
| Follow: true, | ||
| Logger: lg, | ||
| Tracker: wrapTracker{ | ||
| t: NewTracker(lg), | ||
| create: func(name string) { | ||
| close(started) | ||
| }, | ||
| }, | ||
| }) | ||
|
|
||
| read := make(chan struct{}) | ||
| g.Go(func() error { | ||
| var gotLines int | ||
| // Ensure that each tailer got all lines. | ||
| h := func(ctx context.Context, l *Line) error { | ||
| assert.Equal(t, line, string(l.Data)) | ||
| gotLines++ | ||
| if gotLines == lines { | ||
| close(read) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| ctx, cancel := context.WithTimeout(ctx, timeout) | ||
| defer cancel() | ||
|
|
||
| if err := tailer.Tail(ctx, h); !errors.Is(err, errStop) { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
|
|
||
| // Read lines. | ||
| g.Go(func() error { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| case <-read: // ok | ||
| } | ||
| return os.Remove(name) | ||
| }) | ||
|
|
||
| require.NoError(t, g.Wait()) | ||
| } |