From 9d9712da98a08a88f9d8c8faf4409a14ba4bd46d Mon Sep 17 00:00:00 2001
From: Justin Hayes <justinh@rahb.ca>
Date: Wed, 22 May 2024 10:56:20 -0400
Subject: [PATCH] Add MLX-LM Server example

---
 pipelines/mlx_llm.py | 86 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 pipelines/mlx_llm.py

diff --git a/pipelines/mlx_llm.py b/pipelines/mlx_llm.py
new file mode 100644
index 0000000..553df1f
--- /dev/null
+++ b/pipelines/mlx_llm.py
@@ -0,0 +1,86 @@
+from typing import List, Union, Generator, Iterator
+import requests
+import subprocess
+import os
+import socket
+from schemas import OpenAIChatMessage
+
+
+class Pipeline:
+    def __init__(self):
+        # Optionally, you can set the id and name of the pipeline.
+        self.id = "mlx_pipeline"
+        self.name = "MLX Pipeline"
+        self.process = None
+        self.model = os.getenv('MLX_MODEL', 'mistralai/Mistral-7B-Instruct-v0.2')  # Default model if not set in environment variable
+        self.port = self.find_free_port()
+
+    @staticmethod
+    def find_free_port():
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            s.bind(('', 0))
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            return s.getsockname()[1]
+
+    async def on_startup(self):
+        # This function is called when the server is started.
+        print(f"on_startup:{__name__}")
+        self.start_subprocess()
+
+    async def on_shutdown(self):
+        # This function is called when the server is stopped.
+        print(f"on_shutdown:{__name__}")
+        self.stop_subprocess()
+
+    def start_subprocess(self):
+        # Start the subprocess for "mlx_lm.server --model ${MLX_MODEL} --port ${PORT}"
+        try:
+            self.process = subprocess.Popen(
+                ["mlx_lm.server", "--model", self.model, "--port", str(self.port)],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE
+            )
+            print(f"Subprocess started with PID: {self.process.pid} on port {self.port}")
+        except Exception as e:
+            print(f"Failed to start subprocess: {e}")
+
+    def stop_subprocess(self):
+        # Stop the subprocess if it is running
+        if self.process:
+            try:
+                self.process.terminate()
+                self.process.wait()
+                print(f"Subprocess with PID {self.process.pid} terminated")
+            except Exception as e:
+                print(f"Failed to terminate subprocess: {e}")
+
+    def get_response(
+        self, user_message: str, messages: List[OpenAIChatMessage], body: dict
+    ) -> Union[str, Generator, Iterator]:
+        # This is where you can add your custom pipelines like RAG.'
+        print(f"get_response:{__name__}")
+
+        MLX_BASE_URL = f"http://localhost:{self.port}"
+        MODEL = "llama3"
+
+        if "user" in body:
+            print("######################################")
+            print(f'# User: {body["user"]["name"]} ({body["user"]["id"]})')
+            print(f"# Message: {user_message}")
+            print("######################################")
+
+        try:
+            r = requests.post(
+                url=f"{MLX_BASE_URL}/v1/chat/completions",
+                json={**body, "model": MODEL},
+                stream=True,
+            )
+
+            r.raise_for_status()
+
+            if body["stream"]:
+                return r.iter_lines()
+            else:
+                return r.json()
+        except Exception as e:
+            return f"Error: {e}"
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