Change to the new paging format with the commands available at the top.

data/buildlogs.py

@@ -10,6 +10,10 @@ class BuildLogs(object):
   def _logs_key(build_id):
     return 'builds/%s/logs' % build_id
 
+  @staticmethod
+  def _commands_key(build_id):
+    return 'builds/%s/commands' % 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
@@ -20,12 +24,30 @@ class BuildLogs(object):
   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.
+    list and returns the index at which it was inserted.
     """
     log_obj = {
       'message': log_message
     }
-    return self._redis.rpush(self._logs_key(build_id), json.dumps(log_obj))
+    return self._redis.rpush(self._logs_key(build_id), json.dumps(log_obj)) - 1
+
+  def append_command_message(self, build_id, command_message):
+    """
+    Wraps the message in an envelope and push it to the end of the log entry
+    list, to the commands list, and returns the new length of the list.
+    """
+    log_obj = {
+      'message': command_message,
+      'is_command': True,
+    }
+    idx = self._redis.rpush(self._logs_key(build_id), json.dumps(log_obj)) - 1
+
+    cmd_obj = {
+      'message': command_message,
+      'index': idx,
+    }
+    self._redis.rpush(self._commands_key(build_id), json.dumps(cmd_obj))
+    return idx
 
   def get_log_entries(self, build_id, start_index, end_index):
     """ 
@@ -37,6 +59,24 @@ class BuildLogs(object):
                                      end_index)
     return (llen, (json.loads(entry) for entry in log_entries))
 
+  def get_commands(self, build_id):
+    """
+    Returns a list of all Dockerfile commands that have passed through the
+    specified build thus far.
+    """
+    commands = self._redis.lrange(self._commands_key(build_id), 0, -1)
+    return (json.loads(cmd) for cmd in commands)
+
+  def get_last_command(self, build_id):
+    """
+    Returns only the last command from the list of commands.
+    """
+    commands = self._redis.lrange(self._commands_key(build_id), -1, -1)
+    if commands:
+      return json.loads(commands[-1])
+    else:
+      return None
+
   @staticmethod
   def _status_key(build_id):
     return 'builds/%s/status' % build_id