75 行
2.2 KiB
Python
75 行
2.2 KiB
Python
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import asyncio
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import os
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import re
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import time
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from collections import OrderedDict
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import aiofiles
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RE_SEGMENT = re.compile(r'^(?P<index>\d+)\.ts$')
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class DirectoryCache:
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def __init__(self, directory, ttl=0.5):
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self.directory = directory
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self.ttl = ttl
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self.expires = None
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self.files = None
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def timer(self):
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return time.monotonic()
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def listdir(self):
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if self.expires is None or self.timer() >= self.expires:
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print(f'[debug @ {time.time():.4f}] listdir()')
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self.files = os.listdir(self.directory)
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self.expires = self.timer() + self.ttl
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return self.files
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def segments(self):
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segments = []
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for fn in self.listdir():
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match = RE_SEGMENT.match(fn)
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if match:
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segments.append((int(match.group('index')), fn))
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segments.sort()
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return OrderedDict(segments)
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def path(self, fn):
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return os.path.join(self.directory, fn)
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class CatSegments:
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def __init__(self, directory_cache, token):
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self.directory_cache = directory_cache
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self.token = token
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self.index = max(self.directory_cache.segments())
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async def stream(self):
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while True:
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print(
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f'[debug @ {time.time():.4f}: {self.token}] '
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f'index={self.index} '
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f'segments={tuple(self.directory_cache.segments())}'
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)
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# search for current segment
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for i in range(21):
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segment = self.directory_cache.segments().get(self.index)
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if segment is not None:
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break
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if i != 20:
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await asyncio.sleep(0.2)
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else:
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print(
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f'[debug @ {time.time():.4f}: {self.token}] could not '
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f'find segment #{self.index} after at least 4 seconds'
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)
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return
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# read current segment
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fn = self.directory_cache.path(segment)
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async with aiofiles.open(fn, 'rb') as fp:
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while chunk := await fp.read(8192):
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yield chunk
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# increment segment index
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self.index += 1
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