fix(ollama): implement invoke_llm_stream for OllamaChatCompletions

src/langbot/pkg/provider/modelmgr/requesters/ollamachat.py

@@ -104,6 +104,21 @@ class OllamaChatCompletions(requester.ProviderAPIRequester):
 
         return ret_msg
 
+    async def _prepare_messages(
+        self,
+        messages: typing.List[provider_message.Message],
+    ) -> list[dict]:
+        """Prepare messages for Ollama API request."""
+        req_messages: list = []
+        for m in messages:
+            msg_dict: dict = m.dict(exclude_none=True)
+            content: Any = msg_dict.get('content')
+            if isinstance(content, list):
+                if all(isinstance(part, dict) and part.get('type') == 'text' for part in content):
+                    msg_dict['content'] = '\n'.join(part['text'] for part in content)
+            req_messages.append(msg_dict)
+        return req_messages
+
     async def invoke_llm(
         self,
         query: pipeline_query.Query,
@@ -113,14 +128,7 @@ class OllamaChatCompletions(requester.ProviderAPIRequester):
         extra_args: dict[str, typing.Any] = {},
         remove_think: bool = False,
     ) -> provider_message.Message:
-        req_messages: list = []
-        for m in messages:
-            msg_dict: dict = m.dict(exclude_none=True)
-            content: Any = msg_dict.get('content')
-            if isinstance(content, list):
-                if all(isinstance(part, dict) and part.get('type') == 'text' for part in content):
-                    msg_dict['content'] = '\n'.join(part['text'] for part in content)
-            req_messages.append(msg_dict)
+        req_messages = await self._prepare_messages(messages)
         try:
             return await self._closure(
                 query=query,
@@ -133,6 +141,109 @@ class OllamaChatCompletions(requester.ProviderAPIRequester):
         except asyncio.TimeoutError:
             raise errors.RequesterError('请求超时')
 
+    async def invoke_llm_stream(
+        self,
+        query: pipeline_query.Query,
+        model: requester.RuntimeLLMModel,
+        messages: typing.List[provider_message.Message],
+        funcs: typing.List[resource_tool.LLMTool] = None,
+        extra_args: dict[str, typing.Any] = {},
+        remove_think: bool = False,
+    ) -> provider_message.MessageChunk:
+        req_messages = await self._prepare_messages(messages)
+
+        try:
+            args = extra_args.copy()
+            args['model'] = model.model_entity.name
+
+            # Process messages for Ollama format
+            msgs: list[dict] = req_messages.copy()
+            for msg in msgs:
+                if 'content' in msg and isinstance(msg['content'], list):
+                    text_content: list = []
+                    image_urls: list = []
+                    for me in msg['content']:
+                        if me['type'] == 'text':
+                            text_content.append(me['text'])
+                        elif me['type'] == 'image_base64':
+                            image_urls.append(me['image_base64'])
+                    msg['content'] = '\n'.join(text_content)
+                    msg['images'] = [url.split(',')[1] for url in image_urls]
+                if 'tool_calls' in msg:
+                    for tool_call in msg['tool_calls']:
+                        tool_call['function']['arguments'] = json.loads(tool_call['function']['arguments'])
+            args['messages'] = msgs
+
+            args['tools'] = []
+            if funcs:
+                tools = await self.ap.tool_mgr.generate_tools_for_openai(funcs)
+                if tools:
+                    args['tools'] = tools
+
+            args['stream'] = True
+
+            chunk_idx = 0
+            thinking_started = False
+            thinking_ended = False
+            role = 'assistant'
+
+            async for chunk in await self.client.chat(**args):
+                message: ollama.Message = chunk.message
+                done = chunk.done
+
+                delta_content = message.content or ''
+                reasoning_content = getattr(message, 'thinking', '') or ''
+
+                # Handle reasoning/thinking content
+                if reasoning_content:
+                    if remove_think:
+                        chunk_idx += 1
+                        continue
+
+                    if not thinking_started:
+                        thinking_started = True
+                        delta_content = '<think>\n' + reasoning_content
+                    else:
+                        delta_content = reasoning_content
+                elif thinking_started and not thinking_ended and delta_content:
+                    thinking_ended = True
+                    delta_content = '\n</think>\n' + delta_content
+
+                # Handle tool calls
+                tool_calls_data = None
+                if message.tool_calls:
+                    tool_calls_data = []
+                    for tc in message.tool_calls:
+                        tool_calls_data.append(
+                            {
+                                'id': uuid.uuid4().hex,
+                                'type': 'function',
+                                'function': {
+                                    'name': tc.function.name,
+                                    'arguments': json.dumps(tc.function.arguments),
+                                },
+                            }
+                        )
+
+                # Skip empty first chunk
+                if chunk_idx == 0 and not delta_content and not reasoning_content and not tool_calls_data:
+                    chunk_idx += 1
+                    continue
+
+                chunk_data = {
+                    'role': role,
+                    'content': delta_content if delta_content else None,
+                    'tool_calls': tool_calls_data,
+                    'is_final': bool(done),
+                }
+                chunk_data = {k: v for k, v in chunk_data.items() if v is not None}
+
+                yield provider_message.MessageChunk(**chunk_data)
+                chunk_idx += 1
+
+        except asyncio.TimeoutError:
+            raise errors.RequesterError('请求超时')
+
     async def invoke_embedding(
         self,
         model: requester.RuntimeEmbeddingModel,