text: import shutil
  import tempfile
  import unittest
  from queue import Queue
  from threading import Thread, Event
  
  import numpy as np
  
  from cltl.backend.api.storage import AudioParameters
  from cltl.backend.impl.cached_storage import CachedAudioStorage
  
  
  def wait(lock: Event):
      passed = lock.wait(1)
      if isinstance(passed, bool) and not passed:
          raise unittest.TestCase.failureException("Latch timed out")
  
  
  class SynchronizedMicrophoneTest(unittest.TestCase):
      def setUp(self):
          self.tmp_dir = tempfile.mkdtemp()
          self.storage = CachedAudioStorage(self.tmp_dir)
  
      def tearDown(self):
          shutil.rmtree(self.tmp_dir)
  
      def test_store_mono(self):
          audio = np.random.randint(-1000, 1000, (8000,), dtype=np.int16)
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = next(data)
  
          np.testing.assert_array_equal(actual, audio)
  
      def test_store_mono_2d(self):
          audio = np.random.randint(-1000, 1000, (8000,), dtype=np.int16).reshape(8000, 1)
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = next(data)
  
          np.testing.assert_array_equal(actual, audio.ravel())
  
      def test_store_stereo(self):
          audio = np.random.randint(-1000, 1000, (4000, 2), dtype=np.int16)
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = next(data)
  
          np.testing.assert_array_equal(actual, audio)
  
      def test_store_mono_frames(self):
          audio = [np.random.randint(-1000, 1000, (800,), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, audio)
  
      def test_store_mono_2d_frames(self):
          audio = [np.random.randint(-1000, 1000, (800, 1), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, [f.ravel() for f in audio])
  
      def test_store_stereo_frames(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, audio)
  
      def test_read_with_offset(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1", offset=800)
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, audio[2:])
  
      def test_read_with_length(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1", length=800)
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, audio[:2])
  
      def test_read_with_offset_and_length(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1", offset=800, length=800)
          actual = [frame for frame in data]
  
          np.testing.assert_array_equal(actual, audio[2:4])
  
      def test_read_with_offset_not_matching_original_frames_not_supported(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          with self.assertRaisesRegex(ValueError, "400"):
              data, params = self.storage.get("1", offset=600, length=500)
              [frame for frame in data]
  
      def test_read_with_offset_from_cache(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
  
          write_finished = Event()
          data_read = Event()
  
          def audio_generator():
              yield from audio
              write_finished.set()
              wait(data_read)
  
          write_thread = Thread(name="write", target=lambda: self.storage.store("1", audio_generator(), 16000))
          write_thread.start()
          wait(write_finished)
  
          data, params = self.storage.get("1", offset=800, length=400)
          actual = [frame for frame in data]
  
          data_read.set()
  
          np.testing.assert_array_equal(actual, audio[2:3])
  
          write_thread.join(timeout=1)
  
      def test_read_write_parallel(self):
          """
          In a synchronized manner:
              * Write a chunk of frames
              * Read a chunk of frames
  
          The last read should access the persisted audio file.
          """
          started = Event()
          frames_written = Event()
          frames_read = Event()
          write_done = Event()
          read_done = Event()
  
          actual = Queue()
  
          audio = [np.random.randint(-1000, 1000, (4, 2), dtype=np.int16) for _ in range(10)]
          chunk = 2
  
          def audio_generator():
              for i, frame in enumerate(audio):
                  yield frame
  
                  if i > 0 and i % chunk == 0:
                      # After a chunk is written, wait until it is read and reset the read latch
                      frames_written.set()
                      started.set()
                      wait(frames_read)
                      frames_read.clear()
  
              frames_written.set()
              write_done.set()
  
          write_thread = Thread(name="write", target=lambda: self.storage.store("1", audio_generator(), 16000))
  
          def read():
              wait(started)
  
              frames, params = self.storage.get("1")
              wait(frames_written)
              for i, frame in enumerate(frames):
                  actual.put(frame)
  
                  if i > 0 and i % chunk == 0:
                      # After a chunk is read, reset the write latch and wait until the next one is written
                      frames_read.set()
                      if not write_done.isSet():
                          wait(frames_written)
                          frames_written.clear()
  
              read_done.set()
          read_thread = Thread(name="read", target=read)
  
          write_thread.start()
          read_thread.start()
  
          wait(write_done)
          wait(read_done)
  
          np.testing.assert_array_equal(actual.queue, audio)
  
          write_thread.join(timeout=1)
          read_thread.join(timeout=1)
  
      def test_close_read_iterator_from_cache(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
  
          write_finished = Event()
          data_read = Event()
  
          def audio_generator():
              yield from audio
              write_finished.set()
              wait(data_read)
  
          write_thread = Thread(name="write", target=lambda: self.storage.store("1", audio_generator(), 16000))
          write_thread.start()
          wait(write_finished)
  
          data, params = self.storage.get("1")
          actual = next(data)
          data.close()
  
          data_read.set()
  
          np.testing.assert_array_equal([actual], audio[:1])
  
          write_thread.join(timeout=1)
  
      def test_close_read_iterator(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
          actual = next(data)
          data.close()
  
          np.testing.assert_array_equal([actual], audio[:1])
  
  
      def test_parameters(self):
          audio = np.random.randint(-1000, 1000, (400, 2), dtype=np.int16)
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
  
          self.assertEqual(AudioParameters(16000, 2, 400, 2), params)
  
      def test_parameters(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
          self.storage.store("1", audio, 16000)
  
          data, params = self.storage.get("1")
  
          self.assertEqual(AudioParameters(16000, 2, 400, 2), params)
  
      def test_parameters_from_cache(self):
          audio = [np.random.randint(-1000, 1000, (400, 2), dtype=np.int16) for i in range(10)]
  
          write_finished = Event()
          data_read = Event()
  
          def audio_generator():
              yield from audio
              write_finished.set()
              wait(data_read)
  
          write_thread = Thread(name="write", target=lambda: self.storage.store("1", audio_generator(), 16000))
          write_thread.start()
          wait(write_finished)
  
          data, params = self.storage.get("1")
          data_read.set()
  
          self.assertEqual(AudioParameters(16000, 2, 400, 2), params)
  
          write_thread.join(timeout=1)