Add graphrag (#1793)

### What problem does this PR solve?

#1594

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

agent/component/message.py

@@ -0,0 +1,53 @@
+#
+#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import random
+from abc import ABC
+from functools import partial
+from agent.component.base import ComponentBase, ComponentParamBase
+
+
+class MessageParam(ComponentParamBase):
+
+    """
+    Define the Message component parameters.
+    """
+    def __init__(self):
+        super().__init__()
+        self.messages = []
+
+    def check(self):
+        self.check_empty(self.messages, "[Message]")
+        return True
+
+
+class Message(ComponentBase, ABC):
+    component_name = "Message"
+
+    def _run(self, history, **kwargs):
+        if kwargs.get("stream"):
+            return partial(self.stream_output)
+
+        return Message.be_output(random.choice(self._param.messages))
+
+    def stream_output(self):
+        res = None
+        if self._param.messages:
+            res = {"content": random.choice(self._param.messages)}
+            yield res
+
+        self.set_output(res)
+
+