ch2 := make(chan Maskable, 1)
	ch3 := make(chan Maskable, 1)
	doneCh := make(chan struct{})
	defer close(doneCh)
	if err := ps.Subscribe(MaskAll, ch1, doneCh, nil); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if err := ps.Subscribe(MaskAll, ch2, doneCh, nil); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if err := ps.Subscribe(MaskAll, ch3, doneCh, nil); err == nil {
		t.Fatalf("unexpected nil err")
	}
}

func StreamItems[I any](store Store[I], target Target, doneCh <-chan struct{}, logger logger) {
	go func() {
		keyCh := replayItems(store, doneCh, logger, target.Name())
		sendItems(target, keyCh, doneCh, logger)
	}()

				}
				return
			}
		}
	}()
	return func(err error) {
		if doneCh == nil {
			return
		}

		// Indicate we are ready to write.
		doneCh <- err

		// Wait for channel to be closed so we don't race on writes.
		<-doneCh

		// Clear so we can be called multiple times without crashing.
		doneCh = nil
	}, &closeNotifier{rc: r.Body, done: bodyDoneCh}
}

/// tip | "Tipp"

Damit das funktioniert, müssen Sie `pip install python-dotenv` ausführen.

///

### Die `.env`-Datei

Sie könnten eine `.env`-Datei haben, mit:

```bash

/// tip

For this to work, you need to `pip install python-dotenv`.

///

### The `.env` file

You could have a `.env` file with:

```bash
ADMIN_EMAIL="******@****.***"
APP_NAME="ChimichangApp"
```

		}

		if !done {
			// Drain channel.
			for range s.responses {
			}
		}
	}()
	doneCh := s.ctx.Done()
	for {
		select {
		case <-doneCh:
			if err := context.Cause(s.ctx); !errors.Is(err, errStreamEOF) {
				return err
			}
			// Fall through to be sure we have returned all responses.
			doneCh = nil
		case resp, ok := <-s.responses:
			if !ok {
				done = true
				return nil
			}

这种做法相当常见，有一个名称，这些环境变量通常放在一个名为 `.env` 的文件中，该文件被称为“dotenv”。

/// tip

以点 (`.`) 开头的文件是 Unix-like 系统（如 Linux 和 macOS）中的隐藏文件。

但是，dotenv 文件实际上不一定要具有确切的文件名。

///

Pydantic 支持使用外部库从这些类型的文件中读取。您可以在<a href="https://docs.pydantic.dev/latest/concepts/pydantic_settings/#dotenv-env-support" class="external-link" target="_blank">Pydantic 设置: Dotenv (.env) 支持</a>中阅读更多相关信息。

/// tip

			entry := lastN[(cnt+i)%last]
			if (entry == log.Info{}) {
				continue
			}
			select {
			case subCh <- entry:
			case <-doneCh:
				return nil
			}
		}
	}
	return sys.pubsub.Subscribe(madmin.LogMaskAll, subCh, doneCh, filter)
}

// Init if HTTPConsoleLoggerSys is valid, always returns nil right now
func (sys *HTTPConsoleLoggerSys) Init(_ context.Context) error {
	return nil

/// dica

Para que isso funcione você precisa executar `pip install python-dotenv`.

///

### O arquivo `.env`

Você pode definir um arquivo `.env` com o seguinte conteúdo:

```bash
ADMIN_EMAIL="******@****.***"
APP_NAME="ChimichangApp"

		return ps.Participating && ps.Info.Status == rebalStarted
	}
	return false
}

func (z *erasureServerPools) rebalanceBuckets(ctx context.Context, poolIdx int) (err error) {
	doneCh := make(chan error, 1)
	defer xioutil.SafeClose(doneCh)

	// Save rebalance.bin periodically.
	go func() {
		// Update rebalance.bin periodically once every 5-10s, chosen randomly