Switch to the redis backed build logs and status.

data/buildlogs.py

@@ -0,0 +1,56 @@
+import redis
+import json
+
+
+class BuildLogs(object):
+  def __init__(self, redis_host):
+    self._redis = redis.StrictRedis(host=redis_host)
+
+  @staticmethod
+  def _logs_key(build_id):
+    return 'builds/%s/logs' % build_id
+
+  def append_log_entry(self, build_id, log_obj):
+    """
+    Appends the serialized form of log_obj to the end of the log entry list
+    and returns the new length of the list.
+    """
+    return self._redis.rpush(self._logs_key(build_id), json.dumps(log_obj))
+
+  def append_log_message(self, build_id, log_message):
+    """
+    Wraps the message in an envelope and push it to the end of the log entry
+    list and returns the new length of the list.
+    """
+    log_obj = {
+      'message': log_message
+    }
+    return self._redis.rpush(self._logs_key(build_id), json.dumps(log_obj))
+
+  def get_log_entries(self, build_id, start_index, end_index):
+    """ 
+    Returns a tuple of the current length of the list and an iterable of the
+    requested log entries. End index is inclusive.
+    """
+    llen = self._redis.llen(self._logs_key(build_id))
+    log_entries = self._redis.lrange(self._logs_key(build_id), start_index,
+                                     end_index)
+    return (llen, (json.loads(entry) for entry in log_entries))
+
+  @staticmethod
+  def _status_key(build_id):
+    return 'builds/%s/status' % build_id
+
+  def set_status(self, build_id, status_obj):
+    """
+    Sets the status key for this build to json serialized form of the supplied
+    obj.
+    """
+    self._redis.set(self._status_key(build_id), json.dumps(status_obj))
+
+  def get_status(self, build_id):
+    """
+    Loads the status information for the specified build id.
+    """
+    fetched = self._redis.get(self._status_key(build_id))
+    return json.loads(fetched) if fetched else None