(test) usage based router + fallbacks

litellm/tests/test_router_fallbacks.py

@@ -698,3 +698,89 @@ async def test_async_fallbacks_max_retries_per_request():
         pytest.fail(f"An exception occurred: {e}")
     finally:
         router.reset()
+
+
+def test_usage_based_routing_fallbacks():
+    import os
+    import litellm
+    from litellm import Router
+    from dotenv import load_dotenv
+
+    load_dotenv()
+
+    # Constants for TPM and RPM allocation
+    AZURE_FAST_TPM = 3
+    AZURE_BASIC_TPM = 2
+    OPENAI_TPM = 2000
+    ANTHROPIC_TPM = 100000
+
+    def get_azure_params(deployment_name: str):
+        params = {
+            "model": f"azure/{deployment_name}",
+            "api_key": os.environ["AZURE_API_KEY"],
+            "api_version": os.environ["AZURE_API_VERSION"],
+            "api_base": os.environ["AZURE_API_BASE"],
+        }
+        return params
+
+    def get_openai_params(model: str):
+        params = {
+            "model": model,
+            "api_key": os.environ["OPENAI_API_KEY"],
+        }
+        return params
+
+    def get_anthropic_params(model: str):
+        params = {
+            "model": model,
+            "api_key": os.environ["ANTHROPIC_API_KEY"],
+        }
+        return params
+
+    model_list = [
+        {
+            "model_name": "azure/gpt-4-fast",
+            "litellm_params": get_azure_params("chatgpt-v-2"),
+            "tpm": AZURE_FAST_TPM,
+        },
+        {
+            "model_name": "azure/gpt-4-basic",
+            "litellm_params": get_azure_params("chatgpt-v-2"),
+            "tpm": AZURE_BASIC_TPM,
+        },
+        {
+            "model_name": "openai-gpt-4",
+            "litellm_params": get_openai_params("gpt-3.5-turbo"),
+            "tpm": OPENAI_TPM,
+        },
+        {
+            "model_name": "anthropic-claude-instant-1.2",
+            "litellm_params": get_anthropic_params("claude-instant-1.2"),
+            "tpm": ANTHROPIC_TPM,
+        },
+    ]
+    # litellm.set_verbose=True
+    fallbacks_list = [
+        {"azure/gpt-4-fast": ["azure/gpt-4-basic"]},
+        {"azure/gpt-4-basic": ["openai-gpt-4"]},
+        {"openai-gpt-4": ["anthropic-claude-instant-1.2"]},
+    ]
+
+    router = Router(
+        model_list=model_list,
+        fallbacks=fallbacks_list,
+        set_verbose=True,
+        routing_strategy="usage-based-routing",
+        redis_host=os.environ["REDIS_HOST"],
+        redis_port=os.environ["REDIS_PORT"],
+    )
+
+    messages = [
+        {"content": "Tell me a joke.", "modality": "voice"},
+    ]
+
+    response = router.completion(
+        model="azure/gpt-4-fast", messages=messages, n=10, timeout=5
+    )
+
+    print("response: ", response)