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litellm / litellm /router_strategy /lowest_tpm_rpm.py

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	#### What this does ####
	# identifies lowest tpm deployment

	import dotenv, os, requests, random
	from typing import Optional, Union, List, Dict
	from datetime import datetime

	dotenv.load_dotenv() # Loading env variables using dotenv
	import traceback
	from litellm import token_counter
	from litellm.caching import DualCache
	from litellm.integrations.custom_logger import CustomLogger


	class LowestTPMLoggingHandler(CustomLogger):
	test_flag: bool = False
	logged_success: int = 0
	logged_failure: int = 0
	default_cache_time_seconds: int = 1 * 60 * 60 # 1 hour

	def __init__(self, router_cache: DualCache, model_list: list):
	self.router_cache = router_cache
	self.model_list = model_list

	def log_success_event(self, kwargs, response_obj, start_time, end_time):
	try:
	"""
	Update TPM/RPM usage on success
	"""
	if kwargs["litellm_params"].get("metadata") is None:
	pass
	else:
	model_group = kwargs["litellm_params"]["metadata"].get(
	"model_group", None
	)

	id = kwargs["litellm_params"].get("model_info", {}).get("id", None)
	if model_group is None or id is None:
	return

	total_tokens = response_obj["usage"]["total_tokens"]

	# ------------
	# Setup values
	# ------------
	current_minute = datetime.now().strftime("%H-%M")
	tpm_key = f"{model_group}:tpm:{current_minute}"
	rpm_key = f"{model_group}:rpm:{current_minute}"

	# ------------
	# Update usage
	# ------------

	## TPM
	request_count_dict = self.router_cache.get_cache(key=tpm_key) or {}
	request_count_dict[id] = request_count_dict.get(id, 0) + total_tokens

	self.router_cache.set_cache(key=tpm_key, value=request_count_dict)

	## RPM
	request_count_dict = self.router_cache.get_cache(key=rpm_key) or {}
	request_count_dict[id] = request_count_dict.get(id, 0) + 1

	self.router_cache.set_cache(key=rpm_key, value=request_count_dict)

	### TESTING ###
	if self.test_flag:
	self.logged_success += 1
	except Exception as e:
	traceback.print_exc()
	pass

	async def async_log_success_event(self, kwargs, response_obj, start_time, end_time):
	try:
	"""
	Update TPM/RPM usage on success
	"""
	if kwargs["litellm_params"].get("metadata") is None:
	pass
	else:
	model_group = kwargs["litellm_params"]["metadata"].get(
	"model_group", None
	)

	id = kwargs["litellm_params"].get("model_info", {}).get("id", None)
	if model_group is None or id is None:
	return

	total_tokens = response_obj["usage"]["total_tokens"]

	# ------------
	# Setup values
	# ------------
	current_minute = datetime.now().strftime("%H-%M")
	tpm_key = f"{model_group}:tpm:{current_minute}"
	rpm_key = f"{model_group}:rpm:{current_minute}"

	# ------------
	# Update usage
	# ------------
	# update cache

	## TPM
	request_count_dict = self.router_cache.get_cache(key=tpm_key) or {}
	request_count_dict[id] = request_count_dict.get(id, 0) + total_tokens

	self.router_cache.set_cache(key=tpm_key, value=request_count_dict)

	## RPM
	request_count_dict = self.router_cache.get_cache(key=rpm_key) or {}
	request_count_dict[id] = request_count_dict.get(id, 0) + 1

	self.router_cache.set_cache(key=rpm_key, value=request_count_dict)

	### TESTING ###
	if self.test_flag:
	self.logged_success += 1
	except Exception as e:
	traceback.print_exc()
	pass

	def get_available_deployments(
	self,
	model_group: str,
	healthy_deployments: list,
	messages: Optional[List[Dict[str, str]]] = None,
	input: Optional[Union[str, List]] = None,
	):
	"""
	Returns a deployment with the lowest TPM/RPM usage.
	"""
	# get list of potential deployments
	current_minute = datetime.now().strftime("%H-%M")
	tpm_key = f"{model_group}:tpm:{current_minute}"
	rpm_key = f"{model_group}:rpm:{current_minute}"

	tpm_dict = self.router_cache.get_cache(key=tpm_key)
	rpm_dict = self.router_cache.get_cache(key=rpm_key)

	# -----------------------
	# Find lowest used model
	# ----------------------
	lowest_tpm = float("inf")
	deployment = None
	if tpm_dict is None: # base case
	item = random.choice(healthy_deployments)
	return item

	all_deployments = tpm_dict
	for d in healthy_deployments:
	## if healthy deployment not yet used
	if d["model_info"]["id"] not in all_deployments:
	all_deployments[d["model_info"]["id"]] = 0

	try:
	input_tokens = token_counter(messages=messages, text=input)
	except:
	input_tokens = 0

	for item, item_tpm in all_deployments.items():
	## get the item from model list
	_deployment = None
	for m in healthy_deployments:
	if item == m["model_info"]["id"]:
	_deployment = m

	if _deployment is None:
	continue # skip to next one

	_deployment_tpm = (
	_deployment.get("tpm", None)
	or _deployment.get("litellm_params", {}).get("tpm", None)
	or _deployment.get("model_info", {}).get("tpm", None)
	or float("inf")
	)

	_deployment_rpm = (
	_deployment.get("rpm", None)
	or _deployment.get("litellm_params", {}).get("rpm", None)
	or _deployment.get("model_info", {}).get("rpm", None)
	or float("inf")
	)

	if item_tpm == 0:
	deployment = _deployment
	break
	elif (
	item_tpm + input_tokens > _deployment_tpm
	or rpm_dict[item] + 1 > _deployment_rpm
	): # if user passed in tpm / rpm in the model_list
	continue
	elif item_tpm < lowest_tpm:
	lowest_tpm = item_tpm
	deployment = _deployment
	return deployment