models - ollama - init async client per request (#433)

Author: pgrayy

src/strands/models/ollama.py

@@ -68,14 +68,12 @@ def __init__(
             ollama_client_args: Additional arguments for the Ollama client.
             **model_config: Configuration options for the Ollama model.
         """
+        self.host = host
+        self.client_args = ollama_client_args or {}
         self.config = OllamaModel.OllamaConfig(**model_config)
 
         logger.debug("config=<%s> | initializing", self.config)
 
-        ollama_client_args = ollama_client_args if ollama_client_args is not None else {}
-
-        self.client = ollama.AsyncClient(host, **ollama_client_args)
-
     @override
     def update_config(self, **model_config: Unpack[OllamaConfig]) -> None:  # type: ignore
         """Update the Ollama Model configuration with the provided arguments.
@@ -306,7 +304,8 @@ async def stream(
         logger.debug("invoking model")
         tool_requested = False
 
-        response = await self.client.chat(**request)
+        client = ollama.AsyncClient(self.host, **self.client_args)
+        response = await client.chat(**request)
 
         logger.debug("got response from model")
         yield self.format_chunk({"chunk_type": "message_start"})
@@ -346,7 +345,9 @@ async def structured_output(
         formatted_request = self.format_request(messages=prompt)
         formatted_request["format"] = output_model.model_json_schema()
         formatted_request["stream"] = False
-        response = await self.client.chat(**formatted_request)
+
+        client = ollama.AsyncClient(self.host, **self.client_args)
+        response = await client.chat(**formatted_request)
 
         try:
             content = response.message.content.strip()