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import logging
import time
import uuid
from typing import Any, AsyncIterator
import httpx
from fastapi import HTTPException
from config import (
UPSTREAM_URL, UPSTREAM_HEADERS, DEFAULT_MODEL,
UPSTREAM_TIMEOUT_SECS, UPSTREAM_CONNECT_TIMEOUT_SECS,
UPSTREAM_MAX_CONNECTIONS, UPSTREAM_MAX_KEEPALIVE_CONNECTIONS,
UPSTREAM_KEEPALIVE_EXPIRY_SECS, UPSTREAM_PROXY_URL,
)
from response_cache import CompletionArtifact
logger = logging.getLogger(__name__)
_UPSTREAM_CLIENT: httpx.AsyncClient | None = None
def create_upstream_client() -> httpx.AsyncClient:
transport_kwargs: dict[str, Any] = {}
if UPSTREAM_PROXY_URL:
transport_kwargs["proxy"] = UPSTREAM_PROXY_URL
transport = httpx.AsyncHTTPTransport(
retries=0,
limits=httpx.Limits(
max_connections=UPSTREAM_MAX_CONNECTIONS,
max_keepalive_connections=UPSTREAM_MAX_KEEPALIVE_CONNECTIONS,
keepalive_expiry=UPSTREAM_KEEPALIVE_EXPIRY_SECS,
),
**transport_kwargs,
)
return httpx.AsyncClient(
timeout=httpx.Timeout(UPSTREAM_TIMEOUT_SECS, connect=UPSTREAM_CONNECT_TIMEOUT_SECS),
transport=transport,
trust_env=True,
http2=False,
)
def get_upstream_client() -> httpx.AsyncClient:
global _UPSTREAM_CLIENT
if _UPSTREAM_CLIENT is None:
_UPSTREAM_CLIENT = create_upstream_client()
return _UPSTREAM_CLIENT
async def close_upstream_client() -> None:
global _UPSTREAM_CLIENT
if _UPSTREAM_CLIENT is not None:
await _UPSTREAM_CLIENT.aclose()
_UPSTREAM_CLIENT = None
async def iter_upstream_events(payload: dict) -> AsyncIterator[tuple[str, dict]]:
client = get_upstream_client()
request_started = time.time()
event_counts: dict[str, int] = {}
raw_line_samples: list[str] = []
parsed_samples: list[dict] = []
skipped_lines = 0
json_errors = 0
byte_count = 0
try:
async with client.stream("POST", UPSTREAM_URL, headers=UPSTREAM_HEADERS, json=payload) as r:
logger.info(
"upstream response status=%s content-type=%s model=%s messages=%s",
r.status_code,
r.headers.get("content-type"),
payload.get("model"),
len(payload.get("messages") or []),
)
if r.status_code != 200:
body = await r.aread()
err_body = body.decode("utf-8", errors="replace")[:2000]
logger.warning(
"upstream non-200 status=%s body=%r headers=%s",
r.status_code,
err_body[:1000],
dict(r.headers),
)
yield ("error", {"status_code": r.status_code, "body": err_body or f"upstream returned HTTP {r.status_code}"})
return
buffer = b""
async for chunk in r.aiter_bytes():
if not chunk:
continue
byte_count += len(chunk)
buffer += chunk
while b"\n" in buffer:
line, buffer = buffer.split(b"\n", 1)
s = line.decode("utf-8", errors="replace").rstrip("\r")
if s and len(raw_line_samples) < 8:
raw_line_samples.append(s[:500])
if not s or s.startswith("event:") or s.startswith("ddata:"):
skipped_lines += 1
continue
if s.startswith("ata:"):
s = "d" + s
if not s.startswith("data:"):
skipped_lines += 1
continue
data = s[5:].lstrip()
if data == "[DONE]":
event_counts["done"] = event_counts.get("done", 0) + 1
yield ("done", {})
continue
try:
obj = json.loads(data)
except Exception as exc:
json_errors += 1
if json_errors <= 3:
logger.warning("upstream JSON parse failed: %s raw=%r", exc, data[:500])
continue
if not isinstance(obj, dict):
skipped_lines += 1
continue
if len(parsed_samples) < 5:
parsed_samples.append(obj)
t = obj.get("type")
if not t or t == "job_id":
skipped_lines += 1
continue
if t == "delta" and "text" in obj and "index" not in obj:
obj = {
"type": "content_block_delta",
"index": 0,
"delta": {"type": "text_delta", "text": obj.get("text", "")},
}
t = "content_block_delta"
if t == "error":
yield ("error", {"status_code": 502, "body": obj.get("message") or json.dumps(obj, ensure_ascii=False)})
return
event_counts[t] = event_counts.get(t, 0) + 1
yield (t, obj)
if buffer.strip():
tail = buffer.decode("utf-8", errors="replace").strip()
if len(raw_line_samples) < 8:
raw_line_samples.append(tail[:500])
logger.info(
"upstream stream finished status=%s bytes=%s duration=%.2fs events=%s skipped=%s json_errors=%s samples=%s parsed_samples=%s",
r.status_code,
byte_count,
time.time() - request_started,
event_counts,
skipped_lines,
json_errors,
raw_line_samples,
parsed_samples,
)
except httpx.TimeoutException as exc:
logger.exception("upstream timeout after %.2fs model=%s error=%s", time.time() - request_started, payload.get("model"), exc)
yield ("error", {"status_code": 504, "body": f"upstream timeout: {type(exc).__name__}: {exc}"})
except httpx.HTTPError as exc:
logger.exception("upstream HTTP error after %.2fs model=%s error=%s", time.time() - request_started, payload.get("model"), exc)
yield ("error", {"status_code": 502, "body": f"upstream HTTP error: {type(exc).__name__}: {exc}"})
except Exception as exc:
logger.exception("upstream unexpected error after %.2fs model=%s error=%s", time.time() - request_started, payload.get("model"), exc)
yield ("error", {"status_code": 502, "body": f"upstream unexpected error: {type(exc).__name__}: {exc}"})
async def collect_upstream_text(payload: dict) -> tuple[str, str, dict, str, dict]:
"""Run through the whole upstream stream and collect:
(full_text, model_id, usage, stop_reason, message_start_obj)
"""
text_parts: list[str] = []
model_id = payload.get("model", DEFAULT_MODEL)
stop_reason = "end_turn"
usage = {"input_tokens": 0, "output_tokens": 0}
msg_start = {}
event_counts: dict[str, int] = {}
async for event_name, obj in iter_upstream_events(payload):
event_counts[event_name] = event_counts.get(event_name, 0) + 1
if event_name == "error":
logger.warning("upstream collection failed events=%s error=%s", event_counts, obj)
raise HTTPException(status_code=obj.get("status_code", 502), detail=obj.get("body", "upstream error"))
if event_name == "message_start":
msg_start = obj.get("message", {})
model_id = msg_start.get("model", model_id)
if "usage" in msg_start:
usage["input_tokens"] = msg_start["usage"].get("input_tokens", 0)
elif event_name == "content_block_delta":
delta = obj.get("delta", {})
if delta.get("type") == "text_delta":
text_parts.append(delta.get("text", ""))
elif event_name == "message_delta":
d = obj.get("delta", {})
if d.get("stop_reason"):
stop_reason = d["stop_reason"]
u = obj.get("usage")
if u and "output_tokens" in u:
usage["output_tokens"] = u["output_tokens"]
full_text = "".join(text_parts)
if not full_text:
logger.warning(
"upstream returned no text model=%s events=%s msg_start=%s usage=%s stop_reason=%s",
model_id,
event_counts,
msg_start,
usage,
stop_reason,
)
return (full_text, model_id, usage, stop_reason, msg_start)
def build_completion_artifact(raw_text: str, model_id: str, usage: dict, stop_reason: str) -> CompletionArtifact:
return CompletionArtifact(
schema_version=1,
raw_text=raw_text,
model_id=model_id,
usage_input_tokens=int(usage.get("input_tokens", 0)),
usage_output_tokens=int(usage.get("output_tokens", 0)),
stop_reason=stop_reason or "end_turn",
stored_at=time.time(),
)
class LiveArtifactCapture:
def __init__(self, fallback_model: str):
self.fallback_model = fallback_model
self.model_id = fallback_model
self.raw_text_parts: list[str] = []
self.usage = {"input_tokens": 0, "output_tokens": 0}
self.stop_reason = "end_turn"
self.failed = False
self.completed = False
def observe(self, event_name: str, obj: dict) -> None:
if event_name == "error":
self.failed = True
return
if event_name == "done":
self.completed = True
if not self.raw_text_parts:
logger.warning(
"live stream completed without text model=%s usage=%s stop_reason=%s",
self.model_id,
self.usage,
self.stop_reason,
)
return
if event_name == "message_start":
message = obj.get("message", {})
self.model_id = message.get("model", self.model_id)
if "usage" in message:
self.usage["input_tokens"] = message["usage"].get("input_tokens", 0)
return
if event_name == "content_block_delta":
delta = obj.get("delta", {})
if delta.get("type") == "text_delta":
self.raw_text_parts.append(delta.get("text", ""))
return
if event_name == "message_delta":
delta = obj.get("delta", {})
if delta.get("stop_reason"):
self.stop_reason = delta["stop_reason"]
usage = obj.get("usage")
if usage and "output_tokens" in usage:
self.usage["output_tokens"] = usage["output_tokens"]
def is_cacheable(self) -> bool:
return self.completed and not self.failed
def build(self) -> CompletionArtifact:
return build_completion_artifact("".join(self.raw_text_parts), self.model_id, self.usage, self.stop_reason)
async def fetch_completion_artifact(payload: dict) -> CompletionArtifact:
text, model_id, usage, stop_reason, _ = await collect_upstream_text(payload)
return build_completion_artifact(text, model_id, usage, stop_reason)
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