74 lines
2.2 KiB
Python
Executable File
74 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Download flags of countries (with error handling).
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ThreadPool version
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Sample run::
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$ python3 flags2_threadpool.py -s ERROR -e
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ERROR site: http://localhost:8003/flags
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Searching for 676 flags: from AA to ZZ
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30 concurrent connections will be used.
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--------------------
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150 flags downloaded.
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361 not found.
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165 errors.
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Elapsed time: 7.46s
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"""
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# tag::FLAGS2_THREADPOOL[]
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from collections import Counter
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from concurrent import futures
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import requests
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import tqdm # type: ignore # <1>
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from flags2_common import main, HTTPStatus # <2>
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from flags2_sequential import download_one # <3>
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DEFAULT_CONCUR_REQ = 30 # <4>
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MAX_CONCUR_REQ = 1000 # <5>
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def download_many(cc_list: list[str],
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base_url: str,
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verbose: bool,
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concur_req: int) -> Counter[int]:
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counter: Counter[int] = Counter()
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with futures.ThreadPoolExecutor(max_workers=concur_req) as executor: # <6>
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to_do_map = {} # <7>
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for cc in sorted(cc_list): # <8>
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future = executor.submit(download_one, cc,
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base_url, verbose) # <9>
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to_do_map[future] = cc # <10>
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done_iter = futures.as_completed(to_do_map) # <11>
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if not verbose:
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done_iter = tqdm.tqdm(done_iter, total=len(cc_list)) # <12>
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for future in done_iter: # <13>
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try:
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res = future.result() # <14>
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except requests.exceptions.HTTPError as exc: # <15>
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error_fmt = 'HTTP {res.status_code} - {res.reason}'
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error_msg = error_fmt.format(res=exc.response)
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except requests.exceptions.ConnectionError:
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error_msg = 'Connection error'
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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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cc = to_do_map[future] # <16>
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print(f'*** Error for {cc}: {error_msg}')
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return counter
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if __name__ == '__main__':
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main(download_many, DEFAULT_CONCUR_REQ, MAX_CONCUR_REQ)
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# end::FLAGS2_THREADPOOL[]
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