91 lines
2.5 KiB
Python
Executable File
91 lines
2.5 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Download flags of countries (with error handling).
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Sequential version
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Sample run::
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$ python3 flags2_sequential.py -s DELAY b
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DELAY site: http://localhost:8002/flags
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Searching for 26 flags: from BA to BZ
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1 concurrent connection will be used.
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--------------------
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17 flags downloaded.
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9 not found.
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Elapsed time: 13.36s
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"""
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from collections import Counter
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import requests
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import tqdm # type: ignore
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from flags2_common import main, save_flag, HTTPStatus, Result
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DEFAULT_CONCUR_REQ = 1
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MAX_CONCUR_REQ = 1
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# tag::FLAGS2_BASIC_HTTP_FUNCTIONS[]
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def get_flag(base_url: str, cc: str) -> bytes:
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url = f'{base_url}/{cc}/{cc}.gif'.lower()
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resp = requests.get(url)
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if resp.status_code != 200: # <1>
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resp.raise_for_status()
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return resp.content
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def download_one(cc: str, base_url: str, verbose: bool = False):
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try:
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image = get_flag(base_url, cc)
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except requests.exceptions.HTTPError as exc: # <2>
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res = exc.response
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if res.status_code == 404:
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status = HTTPStatus.not_found # <3>
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msg = 'not found'
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else: # <4>
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raise
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else:
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save_flag(image, f'{cc}.gif')
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status = HTTPStatus.ok
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msg = 'OK'
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if verbose: # <5>
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print(cc, msg)
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return Result(status, cc) # <6>
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# end::FLAGS2_BASIC_HTTP_FUNCTIONS[]
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# tag::FLAGS2_DOWNLOAD_MANY_SEQUENTIAL[]
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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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_unused_concur_req: int) -> Counter[int]:
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counter: Counter[int] = Counter() # <1>
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cc_iter = sorted(cc_list) # <2>
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if not verbose:
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cc_iter = tqdm.tqdm(cc_iter) # <3>
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for cc in cc_iter: # <4>
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try:
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res = download_one(cc, base_url, verbose) # <5>
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except requests.exceptions.HTTPError as exc: # <6>
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error_msg = 'HTTP error {res.status_code} - {res.reason}'
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error_msg = error_msg.format(res=exc.response)
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except requests.exceptions.ConnectionError: # <7>
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error_msg = 'Connection error'
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else: # <8>
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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 # <9>
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counter[status] += 1 # <10>
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if verbose and error_msg: # <11>
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print(f'*** Error for {cc}: {error_msg}')
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return counter # <12>
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# end::FLAGS2_DOWNLOAD_MANY_SEQUENTIAL[]
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if __name__ == '__main__':
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main(download_many, DEFAULT_CONCUR_REQ, MAX_CONCUR_REQ)
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