109 lines
2.9 KiB
Python
109 lines
2.9 KiB
Python
"""Download flags of countries (with error handling).
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asyncio version using thread pool to save files
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"""
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import asyncio
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import collections
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import aiohttp
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from aiohttp import web
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import tqdm
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from flags2_common import main, HTTPStatus, Result, save_flag
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# default set low to avoid errors from remote site, such as
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# 503 - Service Temporarily Unavailable
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DEFAULT_CONCUR_REQ = 5
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MAX_CONCUR_REQ = 1000
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class FetchError(Exception):
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def __init__(self, country_code):
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self.country_code = country_code
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@asyncio.coroutine
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def get_flag(base_url, cc):
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url = '{}/{cc}/{cc}.gif'.format(base_url, cc=cc.lower())
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resp = yield from aiohttp.request('GET', url)
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if resp.status == 200:
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image = yield from resp.read()
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return image
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elif resp.status == 404:
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raise web.HTTPNotFound()
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else:
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raise aiohttp.HttpProcessingError(
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code=resp.status, message=resp.reason,
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headers=resp.headers)
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# BEGIN FLAGS2_ASYNCIO_EXECUTOR
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@asyncio.coroutine
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def download_one(cc, base_url, semaphore, verbose):
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try:
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with (yield from semaphore):
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image = yield from get_flag(base_url, cc)
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except web.HTTPNotFound:
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status = HTTPStatus.not_found
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msg = 'not found'
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except Exception as exc:
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raise FetchError(cc) from exc
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else:
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loop = asyncio.get_event_loop() # <1>
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loop.run_in_executor(None, # <2>
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save_flag, image, cc.lower() + '.gif') # <3>
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status = HTTPStatus.ok
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msg = 'OK'
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if verbose and msg:
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print(cc, msg)
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return Result(status, cc)
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# END FLAGS2_ASYNCIO_EXECUTOR
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@asyncio.coroutine
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def downloader_coro(cc_list, base_url, verbose, concur_req):
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counter = collections.Counter()
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semaphore = asyncio.Semaphore(concur_req)
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to_do = [download_one(cc, base_url, semaphore, verbose)
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for cc in sorted(cc_list)]
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to_do_iter = asyncio.as_completed(to_do)
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if not verbose:
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to_do_iter = tqdm.tqdm(to_do_iter, total=len(cc_list))
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for future in to_do_iter:
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try:
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res = yield from future
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except FetchError as exc:
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country_code = exc.country_code
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try:
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error_msg = exc.__cause__.args[0]
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except IndexError:
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error_msg = exc.__cause__.__class__.__name__
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else:
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error_msg = ''
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status = res.status
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if error_msg:
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status = HTTPStatus.error
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counter[status] += 1
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if verbose and error_msg:
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msg = '*** Error for {}: {}'
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print(msg.format(country_code, error_msg))
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return counter
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def download_many(cc_list, base_url, verbose, concur_req):
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loop = asyncio.get_event_loop()
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coro = downloader_coro(cc_list, base_url, verbose, concur_req)
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counts = loop.run_until_complete(coro)
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loop.close()
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return counts
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if __name__ == '__main__':
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main(download_many, DEFAULT_CONCUR_REQ, MAX_CONCUR_REQ)
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