Created
April 8, 2019 05:49
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RangeResponse
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| from flask import request, Response | |
| import re | |
| class ResponseRange(Response): | |
| """ A response that gets stream and returns partial content | |
| """ | |
| def __init__(self, response, *args, **kwargs): | |
| stream = response | |
| file_size = len(stream) | |
| range_header = request.headers.get('Range', None) | |
| headers = set() | |
| status_code = None | |
| if range_header: | |
| m = re.search('([0-9]+)-([0-9]*)', range_header) # example: 0-1000 or 1250- | |
| g = m.groups() | |
| byte1, byte2 = 0, None | |
| if g[0]: | |
| byte1 = int(g[0]) | |
| if g[1]: | |
| byte2 = int(g[1]) | |
| if byte1 < file_size: | |
| start = byte1 | |
| if byte2: | |
| length = byte2 + 1 - byte1 | |
| else: | |
| length = file_size - start | |
| stream.seek(start) | |
| value = stream.read(length) | |
| status_code = 206 | |
| headers.add(('Content-Range', 'bytes {0}-{1}/{2}'.format(start, start + length - 1, file_size))) | |
| else: | |
| value = value.read() | |
| super().__init__(value, *args, **kwargs) | |
| if headers: | |
| for k,v in headers: | |
| self.headers.add(k, v) | |
| if status_code: | |
| self.status_code = status_code | |
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