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149 lines
3.8 KiB
Python
149 lines
3.8 KiB
Python
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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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# when starting the backfiller and every few hours, backfill everything
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# more frequently, backfill the last couple hours
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# (last three hour directories so always at least two hours).
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import glob
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import requests
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import os
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hour_fmt = '%Y-%m-%dT%H'
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def is_localhost(node):
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return None
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def get_nodes():
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# either read a config file or query the database to get the addresses
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# of 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_local_segments(base_dir, stream, variant, hour):
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path = os.path.join(base_dir, stream, variant, hour)
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return [name for name in os.listdir(path) if not name.startswith('.')]
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def get_hours(node, stream, variant):
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resp = requests.get('https://{}/files/{}/{}'.format(node, stream, variant))
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hours = resp.json()
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return hours
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def list_remote_segments(node, stream, variant, hour):
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resp = requests.get('https://{}/files/{}/{}/{}'.format(node, stream,
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variant, hour_str))
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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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def get_remote_segment(base_dir, node, stream, variant, hour, missing_segment):
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resp = requests.get('https://{}/segments/{}/{}/{}/{}'.format(node, stream, variant,
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hour, missing_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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path = os.path.join(base_dir, stream, variant, hour, missing_segment)
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os.rename(temp, segment)
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def back_fill(static_folder, stream, variants, hours=None, nodes=None,
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failure_limit=5):
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# if variants is None, backfill all versions
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# if hours is None, backfill all hourdirs
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# if hours is iterable, backfill those hourdirs
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# if hours is int, backfill last hours hourdirs
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# loop over nodes asking for a list of segments then downloads any
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# segments it doesn't have
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if nodes is None:
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nodes = get_nodes()
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if isinstance(hours, int):
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n_hours = hours
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if n_hours < 1:
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raise ValueError('Number of hours has to be 1 or greater')
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now = datetime.datetime.utcnow()
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now_str = now.strftime(hour_fmt)
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now_hour = datetime.strptime(now_str, hour_fmt)
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hours = [now_str]
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for i in range(n_hours - 1):
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previous_hour = datetime.strptime(hours[-1], hour_fmt)
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current_hour = previous_hour + datetime.timedelta(hours=-1)
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hours.append(current_hour.strftime(hour_fmt))
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for node in nodes:
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back_fill_node(static_folder, node, stream, variants, hours,
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failure_limit)
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def back_fill_node(base_dir, node, stream, variants, hours, failure_limit):
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# need to figure out how to properly check whether this node is the same
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if is_local_host(node):
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return
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failures = 0
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for variant in variants:
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if hours is None:
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node_hours = get_hours(node, stream, variant)
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else:
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node_hours = hours
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for hour in node_hours:
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local_segments = list_local_segments(base_dir, stream, variant,
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hour)
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local_segments = set(local_segments)
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remote_segments = list_remote_segments(node, stream, variant, hour)
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remote_segments = set(remote_segments)
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missing_segments = remote_segments - local_segments
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for missing_segment in missing_segments:
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status = get_remote_segment(base_dir, node, stream, variant,
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hour, missing_segment)
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if not status:
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failures += 1
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if failures > failure_limit:
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return
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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
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# immediately
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