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Caching - In-Memory, Redis, s3, Redis Semantic Cache

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Need to use Caching on LiteLLM Proxy Server? Doc here: Caching Proxy Server

Initialize Cache - In Memory, Redis, s3 Bucket, Redis Semantic Cache​

Install redis

pip install redis

For the hosted version you can setup your own Redis DB here: https://app.redislabs.com/

import litellm
from litellm import completion
from litellm.caching import Cache

litellm.cache = Cache(type="redis", host=<host>, port=<port>, password=<password>)

# Make completion calls
response1 = completion(
    model="gpt-3.5-turbo", 
    messages=[{"role": "user", "content": "Tell me a joke."}]
)
response2 = completion(
    model="gpt-3.5-turbo", 
    messages=[{"role": "user", "content": "Tell me a joke."}]
)

# response1 == response2, response 1 is cached

Cache Context Manager - Enable, Disable, Update Cache​

Use the context manager for easily enabling, disabling & updating the litellm cache

Enabling Cache​

Quick Start Enable

litellm.enable_cache()

Advanced Params

litellm.enable_cache(
    type: Optional[Literal["local", "redis"]] = "local",
    host: Optional[str] = None,
    port: Optional[str] = None,
    password: Optional[str] = None,
    supported_call_types: Optional[
        List[Literal["completion", "acompletion", "embedding", "aembedding"]]
    ] = ["completion", "acompletion", "embedding", "aembedding"],
    **kwargs,
)

Disabling Cache​

Switch caching off 

litellm.disable_cache()

Updating Cache Params (Redis Host, Port etc)​

Update the Cache params

litellm.update_cache(
    type: Optional[Literal["local", "redis"]] = "local",
    host: Optional[str] = None,
    port: Optional[str] = None,
    password: Optional[str] = None,
    supported_call_types: Optional[
        List[Literal["completion", "acompletion", "embedding", "aembedding"]]
    ] = ["completion", "acompletion", "embedding", "aembedding"],
    **kwargs,
)

Custom Cache Keys:​

Define function to return cache key

# this function takes in *args, **kwargs and returns the key you want to use for caching
def custom_get_cache_key(*args, **kwargs):
    # return key to use for your cache:
    key = kwargs.get("model", "") + str(kwargs.get("messages", "")) + str(kwargs.get("temperature", "")) + str(kwargs.get("logit_bias", ""))
    print("key for cache", key)
    return key

Set your function as litellm.cache.get_cache_key

from litellm.caching import Cache

cache = Cache(type="redis", host=os.environ['REDIS_HOST'], port=os.environ['REDIS_PORT'], password=os.environ['REDIS_PASSWORD'])

cache.get_cache_key = custom_get_cache_key # set get_cache_key function for your cache

litellm.cache = cache # set litellm.cache to your cache

How to write custom add/get cache functions​

1. Init Cache​

from litellm.caching import Cache
cache = Cache()

2. Define custom add/get cache functions​

def add_cache(self, result, *args, **kwargs):
  your logic
  
def get_cache(self, *args, **kwargs):
  your logic

3. Point cache add/get functions to your add/get functions​

cache.add_cache = add_cache
cache.get_cache = get_cache

Cache Initialization Parameters​

def __init__(
    self,
    type: Optional[Literal["local", "redis", "s3"]] = "local",
    supported_call_types: Optional[
        List[Literal["completion", "acompletion", "embedding", "aembedding"]]
    ] = ["completion", "acompletion", "embedding", "aembedding"], # A list of litellm call types to cache for. Defaults to caching for all litellm call types.
    
    # redis cache params
    host: Optional[str] = None,
    port: Optional[str] = None,
    password: Optional[str] = None,


    # s3 Bucket, boto3 configuration
    s3_bucket_name: Optional[str] = None,
    s3_region_name: Optional[str] = None,
    s3_api_version: Optional[str] = None,
    s3_path: Optional[str] = None, # if you wish to save to a spefic path
    s3_use_ssl: Optional[bool] = True,
    s3_verify: Optional[Union[bool, str]] = None,
    s3_endpoint_url: Optional[str] = None,
    s3_aws_access_key_id: Optional[str] = None,
    s3_aws_secret_access_key: Optional[str] = None,
    s3_aws_session_token: Optional[str] = None,
    s3_config: Optional[Any] = None,
    **kwargs,
):

Logging​

Cache hits are logged in success events as kwarg["cache_hit"].

Here's an example of accessing it: 

import litellm
from litellm.integrations.custom_logger import CustomLogger
from litellm import completion, acompletion, Cache

# create custom callback for success_events
class MyCustomHandler(CustomLogger):
  async def async_log_success_event(self, kwargs, response_obj, start_time, end_time): 
      print(f"On Success")
      print(f"Value of Cache hit: {kwargs['cache_hit']"})

async def test_async_completion_azure_caching():
  # set custom callback
  customHandler_caching = MyCustomHandler()
  litellm.callbacks = [customHandler_caching]

  # init cache 
  litellm.cache = Cache(type="redis", host=os.environ['REDIS_HOST'], port=os.environ['REDIS_PORT'], password=os.environ['REDIS_PASSWORD'])
  unique_time = time.time()
  response1 = await litellm.acompletion(model="azure/chatgpt-v-2",
                          messages=[{
                              "role": "user",
                              "content": f"Hi 👋 - i'm async azure {unique_time}"
                          }],
                          caching=True)
  await asyncio.sleep(1)
  print(f"customHandler_caching.states pre-cache hit: {customHandler_caching.states}")
  response2 = await litellm.acompletion(model="azure/chatgpt-v-2",
                          messages=[{
                              "role": "user",
                              "content": f"Hi 👋 - i'm async azure {unique_time}"
                          }],
                          caching=True)
  await asyncio.sleep(1) # success callbacks are done in parallel