mirror of
https://github.com/Routstr/routstr-core.git
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301 lines
11 KiB
Python
301 lines
11 KiB
Python
import asyncio
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import hashlib
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import os
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import json
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from typing import Optional
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from fastapi import HTTPException, Request
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from sqlmodel import update, col
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from .cashu import credit_balance, pay_out
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from .db import ApiKey, AsyncSession
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from .models import MODELS
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COST_PER_REQUEST = (
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int(os.environ.get("COST_PER_REQUEST", "1")) * 1000
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) # Convert to msats
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COST_PER_1K_INPUT_TOKENS = (
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int(os.environ.get("COST_PER_1K_INPUT_TOKENS", "0")) * 1000
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) # Convert to msats
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COST_PER_1K_OUTPUT_TOKENS = (
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int(os.environ.get("COST_PER_1K_OUTPUT_TOKENS", "0")) * 1000
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) # Convert to msats
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MODEL_BASED_PRICING = os.environ.get("MODEL_BASED_PRICING", "false").lower() == "true"
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async def validate_bearer_key(
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bearer_key: str,
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session: AsyncSession,
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refund_address: Optional[str] = None,
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key_expiry_time: Optional[int] = None,
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) -> ApiKey:
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"""
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Validates the provided API key using SQLModel.
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If it's a cashu key, it redeems it and stores its hash and balance.
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Otherwise checks if the hash of the key exists.
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"""
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if not bearer_key:
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": "API key or Cashu token required",
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"type": "invalid_request_error",
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"code": "missing_api_key",
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}
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},
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)
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if bearer_key.startswith("sk-"):
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if existing_key := await session.get(ApiKey, bearer_key[3:]):
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if key_expiry_time is not None:
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existing_key.key_expiry_time = key_expiry_time
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if refund_address is not None:
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existing_key.refund_address = refund_address
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return existing_key
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if bearer_key.startswith("cashu"):
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try:
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hashed_key = hashlib.sha256(bearer_key.encode()).hexdigest()
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if existing_key := await session.get(ApiKey, hashed_key):
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if key_expiry_time is not None:
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existing_key.key_expiry_time = key_expiry_time
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if refund_address is not None:
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existing_key.refund_address = refund_address
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return existing_key
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new_key = ApiKey(
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hashed_key=hashed_key,
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balance=0,
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refund_address=refund_address,
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key_expiry_time=key_expiry_time,
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)
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await credit_balance(
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bearer_key,
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new_key,
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session,
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)
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await session.refresh(new_key)
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return new_key
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except Exception as e:
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print(f"Redemption failed: {e}")
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": f"Invalid or expired Cashu key: {str(e)}",
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"type": "invalid_request_error",
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"code": "invalid_api_key",
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}
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},
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)
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": "Invalid API key",
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"type": "invalid_request_error",
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"code": "invalid_api_key",
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}
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},
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)
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async def pay_for_request(
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key: ApiKey,
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session: AsyncSession,
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request: Request | None,
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request_body: bytes | None = None,
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) -> None:
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if MODEL_BASED_PRICING and MODELS:
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if request_body:
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body = json.loads(request_body)
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else:
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body = await request.json() # type: ignore
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if request_model := body.get("model"):
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if request_model not in [model.id for model in MODELS]:
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raise HTTPException(
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status_code=400,
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detail={
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"error": {
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"message": f"Invalid model: {request_model}",
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"type": "invalid_request_error",
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"code": "model_not_found",
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}
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},
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)
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model = next(model for model in MODELS if model.id == request_model)
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if key.balance < model.sats_pricing.max_cost * 1000: # type: ignore
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raise HTTPException(
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status_code=413,
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detail={
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"error": {
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"message": f"This model requires a minimum balance of {model.sats_pricing.max_cost} sats", # type: ignore
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"type": "insufficient_quota",
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"code": "insufficient_balance",
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}
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},
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)
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if key.balance < COST_PER_REQUEST:
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raise HTTPException(
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status_code=402,
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detail={
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"error": {
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"message": f"Insufficient balance: {COST_PER_REQUEST} mSats required. {key.balance} available.",
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"type": "insufficient_quota",
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"code": "insufficient_balance",
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}
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},
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)
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# Charge the base cost for the request atomically to avoid race conditions
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stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.where(col(ApiKey.balance) >= COST_PER_REQUEST)
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.values(
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balance=col(ApiKey.balance) - COST_PER_REQUEST,
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total_spent=col(ApiKey.total_spent) + COST_PER_REQUEST,
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total_requests=col(ApiKey.total_requests) + 1,
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)
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)
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result = await session.exec(stmt) # type: ignore[call-overload]
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await session.commit()
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if result.rowcount == 0:
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# Another concurrent request spent the balance first
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raise HTTPException(
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status_code=402,
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detail={
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"error": {
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"message": f"Insufficient balance: {COST_PER_REQUEST} mSats required. {key.balance} available.",
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"type": "insufficient_quota",
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"code": "insufficient_balance",
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}
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},
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)
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await session.refresh(key)
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async def adjust_payment_for_tokens(
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key: ApiKey, response_data: dict, session: AsyncSession
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) -> dict:
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"""
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Adjusts the payment based on token usage in the response.
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This is called after the initial payment and the upstream request is complete.
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Returns cost data to be included in the response.
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"""
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cost_data: dict = {
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"base_msats": COST_PER_REQUEST,
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"input_msats": 0,
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"output_msats": 0,
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"total_msats": COST_PER_REQUEST,
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}
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# Check if we have usage data
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if "usage" not in response_data or response_data["usage"] is None:
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print("No usage data in response, using base cost only")
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return cost_data
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# Default to configured pricing
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MSATS_PER_1K_INPUT_TOKENS = COST_PER_1K_INPUT_TOKENS
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MSATS_PER_1K_OUTPUT_TOKENS = COST_PER_1K_OUTPUT_TOKENS
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if MODEL_BASED_PRICING and MODELS:
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response_model = response_data.get("model", "")
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if response_model not in [model.id for model in MODELS]:
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raise HTTPException(
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status_code=400,
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detail={
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"error": {
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"message": f"Invalid model in response: {response_model}",
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"type": "invalid_request_error",
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"code": "model_not_found",
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}
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},
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)
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model = next(model for model in MODELS if model.id == response_model)
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if model.sats_pricing is None:
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raise HTTPException(
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status_code=400,
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detail={
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"error": {
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"message": "Model pricing not defined",
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"type": "invalid_request_error",
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"code": "pricing_not_found",
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}
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},
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)
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MSATS_PER_1K_INPUT_TOKENS = model.sats_pricing.prompt * 1_000_000 # type: ignore
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MSATS_PER_1K_OUTPUT_TOKENS = model.sats_pricing.completion * 1_000_000 # type: ignore
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if not (MSATS_PER_1K_OUTPUT_TOKENS and MSATS_PER_1K_INPUT_TOKENS):
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# If no token pricing is configured, just return base cost
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return cost_data
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input_tokens = response_data.get("usage", {}).get("prompt_tokens", 0)
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output_tokens = response_data.get("usage", {}).get("completion_tokens", 0)
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input_msats = int(round(input_tokens / 1000 * MSATS_PER_1K_INPUT_TOKENS, 0))
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output_msats = int(round(output_tokens / 1000 * MSATS_PER_1K_OUTPUT_TOKENS, 0))
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token_based_cost = int(round(input_msats + output_msats, 0))
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cost_data["base_msats"] = 0
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cost_data["input_msats"] = input_msats
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cost_data["output_msats"] = output_msats
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cost_data["total_msats"] = token_based_cost
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# If token-based pricing is enabled and base cost is 0, use token-based cost
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# Otherwise, token cost is additional to the base cost
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cost_difference = token_based_cost - COST_PER_REQUEST
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if cost_difference == 0:
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await session.commit()
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return cost_data # No adjustment needed
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if cost_difference > 0:
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# Need to charge more
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if key.balance < cost_difference:
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print(
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f"Warning: Insufficient balance for token-based pricing adjustment: {key.hashed_key[:10]}..."
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)
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cost_data["warning"] = "Insufficient balance for full token-based pricing"
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cost_data["balance_shortage_msats"] = cost_difference - key.balance
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await session.commit()
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else:
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charge_stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.where(col(ApiKey.balance) >= cost_difference)
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.values(
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balance=col(ApiKey.balance) - cost_difference,
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total_spent=col(ApiKey.total_spent) + cost_difference,
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)
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)
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result = await session.exec(charge_stmt) # type: ignore[call-overload]
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await session.commit()
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if result.rowcount:
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cost_data["total_msats"] = COST_PER_REQUEST + cost_difference
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await session.refresh(key)
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else:
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# Refund some of the base cost
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refund = abs(cost_difference)
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refund_stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.values(
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balance=col(ApiKey.balance) + refund,
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total_spent=col(ApiKey.total_spent) - refund,
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)
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)
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await session.exec(refund_stmt) # type: ignore[call-overload]
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await session.commit()
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cost_data["total_msats"] = COST_PER_REQUEST - refund
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await session.refresh(key)
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asyncio.create_task(pay_out())
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return cost_data
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