lbry-sdk/scripts/download_blobs_from_reflector.py

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2016-12-16 20:35:33 +01:00
"""A test script that downloads blobs from a reflector server"""
import argparse
import itertools
import json
import random
import subprocess
import sys
def main():
parser = argparse.ArgumentParser()
parser.add_argument('reflector_ip')
parser.add_argument('--ssh-key')
parser.add_argument('--size', type=int, default=100)
parser.add_argument('--batch', type=int, default=10)
parser.add_argument('--timeout', type=int, default=30)
parser.add_argument('--hashes', help='file listing hashes in json')
args = parser.parse_args()
if args.hashes:
hashes = readHashes(args.hashes)
else:
hashes = getHashes(args.reflector_ip, args.ssh_key)
if len(hashes) > args.size:
selected_hashes = random.sample(hashes, args.size)
else:
print 'Only {} hashes are available'.format(hashes)
selected_hashes = hashes
successes = 0
for hashes in grouper(selected_hashes, args.batch):
hashes = filter(None, hashes)
successes += downloadHashes(args.reflector_ip, hashes, args.timeout)
print 'Downloaded {} / {}'.format(successes, len(selected_hashes))
def grouper(iterable, n, fillvalue=None):
"Collect data into fixed-length chunks or blocks"
# grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx
args = [iter(iterable)] * n
return itertools.izip_longest(fillvalue=fillvalue, *args)
def readHashes(hash_file):
with open(hash_file) as f:
return json.load(f)
def getHashes(ip, key=None):
key = ['-i', key] if key else []
hashes = subprocess.check_output(['ssh'] + key +
['lbry@{}'.format(ip), '/opt/venvs/lbrynet/bin/lbrynet-cli', 'get_blob_hashes'])
return json.loads(hashes)
def downloadHashes(ip, blob_hashes, timeout=30):
processes = [
subprocess.Popen(
[
'python',
'download_blob_from_peer.py',
'--timeout', str(timeout), '{}:3333'.format(ip), blob_hash,
],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
for blob_hash in blob_hashes
]
for p, h in zip(processes, blob_hashes):
stdout, stderr = p.communicate()
print p.returncode, h
if p.returncode != 0:
print 'Failed to download', h
print stdout
print stderr
return sum(1 for p in processes if p.returncode == 0)
if __name__ == '__main__':
sys.exit(main())