feat: add endpoint to get message history for a chat

Author: winstxnhdw

server/api/v1/chat.py

@@ -17,7 +17,7 @@
 from server.features.embeddings import Embedder
 from server.features.extraction import extract_documents_from_pdfs
 from server.features.question_answering import question_answering
-from server.schemas.v1 import Chat, Files, Query
+from server.schemas.v1 import Chat, Files, Messages, Query
 from server.state import AppState
 
 
@@ -43,6 +43,15 @@ async def create_chat(self) -> Chat:
         """
         return Chat()
 
+    @get('/{chat_id:str}')
+    async def get_chat(self, redis: Annotated[RedisAsync, Dependency()], chat_id: str) -> Messages:
+        """
+        Summary
+        -------
+        an endpoint for getting all chat messages
+        """
+        return Messages(messages=await redis.get_messages(chat_id))
+
     @delete('/{chat_id:str}')
     async def delete_chat(self, redis: Annotated[RedisAsync, Dependency()], chat_id: str) -> None:
         """

server/schemas/v1/__init__.py

@@ -2,4 +2,5 @@
 from server.schemas.v1.chat import Chat as Chat
 from server.schemas.v1.embedding import Embedding as Embedding
 from server.schemas.v1.files import Files as Files
+from server.schemas.v1.messages import Messages as Messages
 from server.schemas.v1.query import Query as Query

server/schemas/v1/messages.py

@@ -0,0 +1,35 @@
+from typing import Annotated
+
+from msgspec import Meta, Struct
+
+from server.features.chat.types import Message
+
+
+class Messages(Struct):
+    """
+    Summary
+    -------
+    the message history schema
+
+    Attributes
+    ----------
+    messages (list[Message]) : the message history
+    """
+
+    messages: Annotated[
+        list[Message],
+        Meta(
+            examples=[
+                [
+                    {
+                        'role': 'user',
+                        'content': 'What is the capital of Japan?',
+                    },
+                    {
+                        'role': 'assistant',
+                        'content': 'Tokyo.',
+                    },
+                ]
+            ]
+        ),
+    ]