1 files changed, 150 insertions, 0 deletions
diff --git a/Tools/TestResultServer/model/datastorefile.py b/Tools/TestResultServer/model/datastorefile.py
new file mode 100755
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+++ b/Tools/TestResultServer/model/datastorefile.py
@@ -0,0 +1,150 @@
+# 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