mirror of https://github.com/ekimekim/wubloader
start of a rough prototype of the backfiller
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# this is a prototype of the backfiller
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# lots about web services and the like I don't know
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# needs logging, exception handling and the like
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import glob
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import requests
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import os
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def get_nodes():
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# either read a config file or query the database to get the addresses of
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# the other nodes
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# as a prototype can just hardcode some addresses.
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nodes = []
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return nodes
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def list_remote_segments(node):
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# return a list of paths
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# obviously update path with real one
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resp = requests.get(node + '/wubloader/segment_list')
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remote_segments = resp.json() #replace with appropriate parser
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return remote_segments
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#based on _get_segment in downloader/main
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#should have a more general shared version of this
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def get_remote_segment(node, segment):
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# obviously update path with real one
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resp = requests.get(node + '/wubloader/segments/' + segment, stream=True)
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with open('temp_backfill', 'w') as f:
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for chunk in resp.iter_content(8192):
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f.write(chunk)
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os.rename(temp, segment)
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def back_fill(base_dir, nodes=None):
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# loop over nodes asking for a list of segments then downloads any segments
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# it doesn't have
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if nodes is None:
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nodes = get_nodes()
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for node in nodes:
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# need to figure out how to properly check whether this node is the
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# same
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if node == 'localhost':
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continue
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# not sure how much we want to hard code the search
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local_segments = set(glob.glob(base_dir + '/*/*/*.ts'))
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remote_segments = set(list_remote_segments(node))
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missing_segments = remote_segments - local_segments
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for missing_segment in missing_segments:
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get_remote_segment(node, missing_segment)
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def main(base_dir, wait_time=60):
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None
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# every wait_time call back_fill
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# time from start of back_fill
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# to keep things simple don't try two back_fills at the same time
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# wait for previous one to start before launching second.
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# if it's taken more than wait_time for back_fill to run, start immediately
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