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authorBen Murdoch <benm@google.com>2011-05-05 14:36:32 +0100
committerBen Murdoch <benm@google.com>2011-05-10 15:38:30 +0100
commitf05b935882198ccf7d81675736e3aeb089c5113a (patch)
tree4ea0ca838d9ef1b15cf17ddb3928efb427c7e5a1 /Tools/TestResultServer/model/datastorefile.py
parent60fbdcc62bced8db2cb1fd233cc4d1e4ea17db1b (diff)
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Merge WebKit at r74534: Initial merge by git.
Change-Id: I6ccd1154fa1b19c2ec2a66878eb675738735f1eb
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diff --git a/Tools/TestResultServer/model/datastorefile.py b/Tools/TestResultServer/model/datastorefile.py
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+# Copyright (C) 2010 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from datetime import datetime
+import logging
+
+from google.appengine.ext import db
+
+MAX_DATA_ENTRY_PER_FILE = 10
+MAX_ENTRY_LEN = 1000 * 1000
+
+
+class DataEntry(db.Model):
+ """Datastore entry that stores one segmant of file data
+ (<1000*1000 bytes).
+ """
+
+ data = db.BlobProperty()
+
+ @classmethod
+ def get(cls, key):
+ return db.get(key)
+
+ def get_data(self, key):
+ return db.get(key)
+
+
+class DataStoreFile(db.Model):
+ """This class stores file in datastore.
+ If a file is oversize (>1000*1000 bytes), the file is split into
+ multiple segments and stored in multiple datastore entries.
+ """
+
+ name = db.StringProperty()
+ data_keys = db.ListProperty(db.Key)
+ # keys to the data store entries that can be reused for new data.
+ # If it is emtpy, create new DataEntry.
+ new_data_keys = db.ListProperty(db.Key)
+ date = db.DateTimeProperty(auto_now_add=True)
+
+ data = None
+
+ def delete_data(self, keys=None):
+ if not keys:
+ keys = self.data_keys
+
+ for key in keys:
+ data_entry = DataEntry.get(key)
+ if data_entry:
+ data_entry.delete()
+
+ def save_data(self, data):
+ if not data:
+ logging.warning("No data to save.")
+ return False
+
+ if len(data) > (MAX_DATA_ENTRY_PER_FILE * MAX_ENTRY_LEN):
+ logging.error("File too big, can't save to datastore: %dK",
+ len(data) / 1024)
+ return False
+
+ start = 0
+ # Use the new_data_keys to store new data. If all new data are saved
+ # successfully, swap new_data_keys and data_keys so we can reuse the
+ # data_keys entries in next run. If unable to save new data for any
+ # reason, only the data pointed by new_data_keys may be corrupted,
+ # the existing data_keys data remains untouched. The corrupted data
+ # in new_data_keys will be overwritten in next update.
+ keys = self.new_data_keys
+ self.new_data_keys = []
+
+ while start < len(data):
+ if keys:
+ key = keys[0]
+ data_entry = DataEntry.get(key)
+ if not data_entry:
+ logging.warning("Found key, but no data entry: %s", key)
+ data_entry = DataEntry()
+ else:
+ data_entry = DataEntry()
+
+ data_entry.data = db.Blob(data[start: start + MAX_ENTRY_LEN])
+ try:
+ data_entry.put()
+ except Exception, err:
+ logging.error("Failed to save data store entry: %s", err)
+ if keys:
+ self.delete_data(keys)
+ return False
+
+ logging.info("Data saved: %s.", data_entry.key())
+ self.new_data_keys.append(data_entry.key())
+ if keys:
+ keys.pop(0)
+
+ start = start + MAX_ENTRY_LEN
+
+ if keys:
+ self.delete_data(keys)
+
+ temp_keys = self.data_keys
+ self.data_keys = self.new_data_keys
+ self.new_data_keys = temp_keys
+ self.data = data
+
+ return True
+
+ def load_data(self):
+ if not self.data_keys:
+ logging.warning("No data to load.")
+ return None
+
+ data = []
+ for key in self.data_keys:
+ logging.info("Loading data for key: %s.", key)
+ data_entry = DataEntry.get(key)
+ if not data_entry:
+ logging.error("No data found for key: %s.", key)
+ return None
+
+ data.append(data_entry.data)
+
+ self.data = "".join(data)
+
+ return self.data