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112 lines
3.3 KiB
Python
112 lines
3.3 KiB
Python
import redis
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from pywb.utils.binsearch import iter_exact
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import urlparse
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import os
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import logging
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"""
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The purpose of this module is to 'resolve' a warc/arc filename,
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often found in a CDX file, to a full loadable url.
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Supported resolvers are: url prefix, path index lookup and redis
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make_best_resolver() attempts to guess the resolver method for given uri
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"""
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#=================================================================
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# PrefixResolver - convert cdx file entry to url with prefix
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# if url contains specified string
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#=================================================================
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class PrefixResolver:
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def __init__(self, prefix, contains):
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self.prefix = prefix
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self.contains = contains if contains else ''
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def __call__(self, filename):
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return [self.prefix + filename] if (self.contains in filename) else []
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def __repr__(self):
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if self.contains:
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return ("PrefixResolver('{0}', contains = '{1}')"
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.format(self.prefix, self.contains))
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else:
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return "PrefixResolver('{0}')".format(self.prefix)
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#=================================================================
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class RedisResolver:
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def __init__(self, redis_url, key_prefix=None):
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self.redis_url = redis_url
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self.key_prefix = key_prefix if key_prefix else 'w:'
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self.redis = redis.StrictRedis.from_url(redis_url)
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def __call__(self, filename):
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redis_val = self.redis.hget(self.key_prefix + filename, 'path')
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return [redis_val] if redis_val else []
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def __repr__(self):
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return "RedisResolver('{0}')".format(self.redis_url)
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#=================================================================
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class PathIndexResolver:
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def __init__(self, pathindex_file):
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self.pathindex_file = pathindex_file
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self.reader = open(pathindex_file)
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def __call__(self, filename):
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result = iter_exact(self.reader, filename, '\t')
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def gen_list(result):
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for pathline in result:
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paths = pathline.split('\t')[1:]
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for path in paths:
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yield path
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return gen_list(result)
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def __repr__(self): # pragma: no cover
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return "PathIndexResolver('{0}')".format(self.pathindex_file)
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#=================================================================
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#TODO: more options (remote files, contains param, etc..)
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# find best resolver given the path
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def make_best_resolver(param):
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if isinstance(param, list):
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path = param[0]
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arg = param[1]
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else:
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path = param
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arg = None
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url_parts = urlparse.urlsplit(path)
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if url_parts.scheme == 'redis':
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logging.debug('Adding Redis Index: ' + path)
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return RedisResolver(path, arg)
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if url_parts.scheme == 'file':
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path = url_parts.path
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if os.path.isfile(path):
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logging.debug('Adding Path Index: ' + path)
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return PathIndexResolver(path)
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# non-file paths always treated as prefix for now
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else:
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logging.debug('Adding Archive Path Source: ' + path)
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return PrefixResolver(path, arg)
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#=================================================================
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def make_best_resolvers(paths):
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if hasattr(paths, '__iter__'):
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return map(make_best_resolver, paths)
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else:
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return [make_best_resolver(paths)]
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