127 lines
2.9 KiB
Python
127 lines
2.9 KiB
Python
# Copyright 2012 Google Inc. All Rights Reserved.
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"""Rule cache.
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"""
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__author__ = 'benvanik@google.com (Ben Vanik)'
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import base64
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import cPickle
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import os
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class RuleCache(object):
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"""Abstract rule cache.
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"""
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def __init__(self, *args, **kwargs):
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"""Initializes the rule cache.
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"""
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pass
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def save(self):
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"""Saves the cache off to disk.
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"""
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pass
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def compute_delta(self, rule_path, mode, src_paths):
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"""Computes a file delta for the given source paths.
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Args:
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rule_path: Full path to the rule.
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mode: Mode indicating which type of set to use.
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src_paths: A list of fully-resolved source file paths.
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Returns:
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A FileDelta with the information from the given paths.
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"""
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file_delta = FileDelta()
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file_delta.all_files.extend(src_paths)
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file_delta.changed_files.extend(src_paths)
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return file_delta
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class FileRuleCache(RuleCache):
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"""File-based rule cache.
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"""
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def __init__(self, cache_path, *args, **kwargs):
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"""Initializes the rule cache.
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Args:
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cache_path: Path to store the cache file in.
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"""
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super(FileRuleCache, self).__init__(self, *args, **kwargs)
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self.cache_path = os.path.join(cache_path, '.anvil-cache')
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self.data = dict()
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self._dirty = False
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if os.path.exists(self.cache_path):
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with open(self.cache_path, 'rb') as file_obj:
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self.data.update(cPickle.load(file_obj))
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def save(self):
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if not self._dirty:
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return
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self._dirty = False
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try:
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os.makedirs(os.path.split(self.cache_path)[0])
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except:
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pass
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with open(self.cache_path, 'wb') as file_obj:
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cPickle.dump(self.data, file_obj, 2)
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def compute_delta(self, rule_path, mode, src_paths):
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file_delta = FileDelta()
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file_delta.all_files.extend(src_paths)
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# Scan all files - we need this to compare regardless of whether we have
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# data from the cache
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# TODO(benvanik): make this parallel
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new_data = dict()
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for src_path in src_paths:
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file_time = os.path.getmtime(src_path)
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file_size = os.path.getsize(src_path)
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new_data[src_path] = '%s-%s' % (file_time, file_size)
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# Always swap for new data
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key = base64.b64encode('%s->%s' % (rule_path, mode))
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old_data = self.data.get(key, None)
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self.data[key] = new_data
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# No previous data - ignore
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if not old_data:
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self._dirty = True
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file_delta.changed_files.extend(src_paths)
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return file_delta
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# Compare data
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# TODO(benvanik): work
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self._dirty = True
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file_delta.changed_files.extend(src_paths)
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return file_delta
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class FileDelta(object):
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"""File delta information.
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"""
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def __init__(self):
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"""Initializes a file delta.
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"""
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self.all_files = []
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self.added_files = []
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self.removed_files = []
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self.modified_files = []
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self.changed_files = []
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def any_changes(self):
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"""
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Returns:
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True if any changes occurred.
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"""
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return len(self.changed_files)
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