aleksey
83d516afa1
FastAPI gateway with A/B/C lane orchestration, LiteLLM proxy config, Swarm stack (postgres, redis, VPN off-by-default), deploy/smoke/audit scripts.
289 lines
9.4 KiB
Python
289 lines
9.4 KiB
Python
"""
|
|
FastAPI AI router gateway — Zed entrypoint with tier/lane orchestration.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
import hashlib
|
|
import json
|
|
import logging
|
|
import os
|
|
import time
|
|
from typing import Any
|
|
|
|
import httpx
|
|
from fastapi import FastAPI, Header, HTTPException, Request, Response
|
|
from fastapi.responses import JSONResponse, StreamingResponse
|
|
|
|
from metrics import CLASSIFY, DURATION, ESCALATIONS, REQUESTS, metrics_payload
|
|
from orchestrator import Orchestrator, SessionStore, Tier
|
|
from rules_loader import reload_configs
|
|
|
|
logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
|
|
log = logging.getLogger("ai-router")
|
|
|
|
LITELLM_URL = os.environ.get("LITELLM_INTERNAL_URL", "http://litellm:4000").rstrip("/")
|
|
LITELLM_KEY = os.environ.get("LITELLM_MASTER_KEY", "")
|
|
ROUTER_API_KEY = os.environ.get("ROUTER_API_KEY", "")
|
|
DEFAULT_MODEL = os.environ.get("DEFAULT_LITELLM_MODEL", "smart-router")
|
|
REDIS_URL = os.environ.get("REDIS_URL", "redis://redis:6379/0")
|
|
|
|
session_store = SessionStore(REDIS_URL or None)
|
|
orchestrator = Orchestrator(session_store)
|
|
|
|
app = FastAPI(title="EventHub AI Router", version="2.0.0")
|
|
|
|
|
|
def _extract_text(messages: list[dict[str, Any]]) -> str:
|
|
parts: list[str] = []
|
|
for msg in messages:
|
|
content = msg.get("content", "")
|
|
if isinstance(content, str):
|
|
parts.append(content)
|
|
elif isinstance(content, list):
|
|
for block in content:
|
|
if isinstance(block, dict) and block.get("type") == "text":
|
|
parts.append(str(block.get("text", "")))
|
|
return "\n".join(parts)
|
|
|
|
|
|
def _has_image(messages: list[dict[str, Any]]) -> bool:
|
|
for msg in messages:
|
|
content = msg.get("content", "")
|
|
if not isinstance(content, list):
|
|
continue
|
|
for block in content:
|
|
if isinstance(block, dict) and block.get("type") in ("image_url", "image"):
|
|
return True
|
|
return False
|
|
|
|
|
|
def _estimate_tokens(text: str) -> int:
|
|
return max(1, len(text) // 4)
|
|
|
|
|
|
def _auth_or_403(authorization: str | None) -> None:
|
|
if not ROUTER_API_KEY:
|
|
return
|
|
if not authorization or not authorization.startswith("Bearer "):
|
|
raise HTTPException(status_code=401, detail="Missing Bearer token")
|
|
token = authorization.removeprefix("Bearer ").strip()
|
|
if token != ROUTER_API_KEY:
|
|
raise HTTPException(status_code=403, detail="Invalid API key")
|
|
|
|
|
|
def _quality_mode(header: str | None, body: dict[str, Any]) -> str | None:
|
|
if header:
|
|
mode = header.strip().lower()
|
|
if mode in ("auto", "economy", "balanced", "max"):
|
|
return mode
|
|
meta = body.get("metadata") or {}
|
|
if isinstance(meta, dict):
|
|
mode = str(meta.get("quality_mode", "")).lower()
|
|
if mode in ("auto", "economy", "balanced", "max"):
|
|
return mode
|
|
return None
|
|
|
|
|
|
def _session_id(body: dict[str, Any]) -> str:
|
|
meta = body.get("metadata") or {}
|
|
if isinstance(meta, dict) and meta.get("session_id"):
|
|
return str(meta["session_id"])
|
|
if body.get("user"):
|
|
return str(body["user"])
|
|
return ""
|
|
|
|
|
|
def _router_meta(decision, *, requested: str) -> dict[str, Any]:
|
|
return {
|
|
"tier": decision.tier.value,
|
|
"lane": decision.lane,
|
|
"model": decision.model,
|
|
"escalation_level": decision.escalation_level,
|
|
"quality_mode": decision.quality_mode,
|
|
"confidence": round(decision.confidence, 3),
|
|
"requested_model": requested,
|
|
"delegated_internal": decision.delegated_internal,
|
|
}
|
|
|
|
|
|
@app.get("/health")
|
|
async def health() -> dict[str, str]:
|
|
return {"status": "ok"}
|
|
|
|
|
|
@app.get("/metrics")
|
|
async def metrics() -> Response:
|
|
body, content_type = metrics_payload()
|
|
return Response(content=body, media_type=content_type)
|
|
|
|
|
|
@app.post("/admin/reload-config")
|
|
async def admin_reload(authorization: str | None = Header(default=None)) -> dict[str, str]:
|
|
_auth_or_403(authorization)
|
|
reload_configs()
|
|
global orchestrator # noqa: PLW0603
|
|
orchestrator = Orchestrator(session_store)
|
|
return {"status": "reloaded"}
|
|
|
|
|
|
@app.get("/v1/models")
|
|
async def list_models(authorization: str | None = Header(default=None)) -> dict[str, Any]:
|
|
_auth_or_403(authorization)
|
|
async with httpx.AsyncClient(timeout=30.0) as client:
|
|
resp = await client.get(
|
|
f"{LITELLM_URL}/v1/models",
|
|
headers={"Authorization": f"Bearer {LITELLM_KEY}"},
|
|
)
|
|
if resp.status_code >= 400:
|
|
raise HTTPException(status_code=resp.status_code, detail=resp.text)
|
|
return resp.json()
|
|
|
|
|
|
@app.post("/classify")
|
|
async def classify_debug(
|
|
request: Request,
|
|
authorization: str | None = Header(default=None),
|
|
x_ai_quality: str | None = Header(default=None, alias="X-AI-Quality"),
|
|
) -> dict[str, Any]:
|
|
_auth_or_403(authorization)
|
|
body = await request.json()
|
|
messages = body.get("messages") or []
|
|
text = _extract_text(messages)
|
|
decision = orchestrator.resolve(
|
|
messages,
|
|
quality_mode=_quality_mode(x_ai_quality, body),
|
|
session_id=_session_id(body),
|
|
text=text,
|
|
has_image=_has_image(messages),
|
|
token_estimate=_estimate_tokens(text),
|
|
)
|
|
CLASSIFY.labels(tier=decision.tier.value).inc()
|
|
return {
|
|
"tier": decision.tier.value,
|
|
"lane": decision.lane,
|
|
"model": decision.model,
|
|
"x_router_meta": _router_meta(decision, requested=body.get("model", DEFAULT_MODEL)),
|
|
}
|
|
|
|
|
|
async def _forward_litellm(
|
|
forward: dict[str, Any],
|
|
*,
|
|
stream: bool,
|
|
decision_meta: dict[str, Any],
|
|
) -> Any:
|
|
headers = {
|
|
"Authorization": f"Bearer {LITELLM_KEY}",
|
|
"Content-Type": "application/json",
|
|
}
|
|
start = time.perf_counter()
|
|
tier = decision_meta.get("tier", "UNKNOWN")
|
|
model = forward.get("model", DEFAULT_MODEL)
|
|
|
|
async with httpx.AsyncClient(timeout=180.0) as client:
|
|
if stream:
|
|
req = client.build_request(
|
|
"POST",
|
|
f"{LITELLM_URL}/v1/chat/completions",
|
|
headers=headers,
|
|
content=json.dumps(forward),
|
|
)
|
|
resp = await client.send(req, stream=True)
|
|
|
|
async def event_stream():
|
|
async for chunk in resp.aiter_bytes():
|
|
yield chunk
|
|
|
|
REQUESTS.labels(tier=tier, lane=decision_meta["lane"], model=model, status=str(resp.status_code)).inc()
|
|
DURATION.labels(tier=tier, model=model).observe(time.perf_counter() - start)
|
|
return StreamingResponse(
|
|
event_stream(),
|
|
status_code=resp.status_code,
|
|
media_type=resp.headers.get("content-type", "text/event-stream"),
|
|
headers={"X-Router-Meta": json.dumps(decision_meta)},
|
|
)
|
|
|
|
resp = await client.post(
|
|
f"{LITELLM_URL}/v1/chat/completions",
|
|
headers=headers,
|
|
json=forward,
|
|
)
|
|
|
|
status = str(resp.status_code)
|
|
REQUESTS.labels(tier=tier, lane=decision_meta["lane"], model=model, status=status).inc()
|
|
DURATION.labels(tier=tier, model=model).observe(time.perf_counter() - start)
|
|
|
|
if resp.status_code >= 400:
|
|
return JSONResponse(status_code=resp.status_code, content=resp.json())
|
|
|
|
data = resp.json()
|
|
if isinstance(data, dict):
|
|
data["x_router_meta"] = decision_meta
|
|
return data
|
|
|
|
|
|
@app.post("/v1/chat/completions")
|
|
async def chat_completions(
|
|
request: Request,
|
|
authorization: str | None = Header(default=None),
|
|
x_ai_quality: str | None = Header(default=None, alias="X-AI-Quality"),
|
|
) -> Any:
|
|
_auth_or_403(authorization)
|
|
|
|
body: dict[str, Any] = await request.json()
|
|
messages = body.get("messages") or []
|
|
if not isinstance(messages, list):
|
|
raise HTTPException(status_code=400, detail="messages must be a list")
|
|
|
|
text = _extract_text(messages)
|
|
has_image = _has_image(messages)
|
|
session_id = _session_id(body)
|
|
prompt_hash = hashlib.sha256(text.encode()).hexdigest()[:16]
|
|
|
|
requested_model = body.get("model", DEFAULT_MODEL)
|
|
if requested_model in ("smart-router", "auto", ""):
|
|
decision = orchestrator.resolve(
|
|
messages,
|
|
quality_mode=_quality_mode(x_ai_quality, body),
|
|
session_id=session_id,
|
|
text=text,
|
|
has_image=has_image,
|
|
token_estimate=_estimate_tokens(text),
|
|
)
|
|
target_model = decision.model
|
|
meta = _router_meta(decision, requested=requested_model)
|
|
else:
|
|
target_model = requested_model
|
|
meta = {"selected_model": target_model, "requested_model": requested_model}
|
|
|
|
forward = dict(body)
|
|
forward["model"] = target_model
|
|
forward.setdefault("metadata", {})
|
|
if isinstance(forward["metadata"], dict):
|
|
forward["metadata"]["semantic_tier"] = meta.get("tier")
|
|
forward["metadata"]["session_id"] = session_id or forward["metadata"].get("session_id")
|
|
|
|
log.info(
|
|
"route tier=%s lane=%s model=%s requested=%s",
|
|
meta.get("tier"),
|
|
meta.get("lane"),
|
|
target_model,
|
|
requested_model,
|
|
)
|
|
|
|
stream = bool(body.get("stream", False))
|
|
result = await _forward_litellm(forward, stream=stream, decision_meta=meta)
|
|
|
|
escalate = isinstance(result, JSONResponse) and result.status_code >= 429
|
|
orchestrator.after_request(
|
|
session_id,
|
|
prompt_hash=prompt_hash,
|
|
success=not escalate,
|
|
escalate=escalate,
|
|
)
|
|
if escalate and meta.get("lane") != "C":
|
|
ESCALATIONS.labels(from_lane=meta.get("lane", "?"), to_lane="next", reason="http_error").inc()
|
|
|
|
return result
|