fix(llm): consume llm base url config with a better way (#1861)

tests/llms/test_openai.py

@@ -1,5 +1,5 @@
 from unittest.mock import Mock, patch
-
+import os
 import pytest
 
 from mem0.configs.llms.base import BaseLlmConfig
@@ -14,6 +14,30 @@ def mock_openai_client():
         yield mock_client
 
 
+def test_openai_llm_base_url():
+    # case1: default config: with openai official base url
+    config = BaseLlmConfig(model="gpt-4o", temperature=0.7, max_tokens=100, top_p=1.0, api_key="api_key")
+    llm = OpenAILLM(config)
+    # Note: openai client will parse the raw base_url into a URL object, which will have a trailing slash
+    assert str(llm.client.base_url) == "https://api.openai.com/v1/"
+
+    # case2: with env variable OPENAI_API_BASE
+    provider_base_url = "https://api.provider.com/v1"
+    os.environ["OPENAI_API_BASE"] = provider_base_url
+    config = BaseLlmConfig(model="gpt-4o", temperature=0.7, max_tokens=100, top_p=1.0, api_key="api_key")
+    llm = OpenAILLM(config)
+    # Note: openai client will parse the raw base_url into a URL object, which will have a trailing slash
+    assert str(llm.client.base_url) == provider_base_url + "/"
+
+    # case3: with config.openai_base_url
+    config_base_url = "https://api.config.com/v1"
+    config = BaseLlmConfig(model="gpt-4o", temperature=0.7, max_tokens=100, top_p=1.0, api_key="api_key",
+                           openai_base_url=config_base_url)
+    llm = OpenAILLM(config)
+    # Note: openai client will parse the raw base_url into a URL object, which will have a trailing slash
+    assert str(llm.client.base_url) == config_base_url + "/"
+
+
 def test_generate_response_without_tools(mock_openai_client):
     config = BaseLlmConfig(model="gpt-4o", temperature=0.7, max_tokens=100, top_p=1.0)
     llm = OpenAILLM(config)