async def __call__(self, scope, receive, send):
"""Implements the ASGI protocol.
See details at:
https://asgi.readthedocs.io/en/latest/specs/index.html.
"""
assert scope["type"] == "http"
# only use the non-root part of the path for routing
root_path = scope["root_path"]
route_path = scope["path"][len(root_path) :]
self.request_counter.inc(tags={"route": route_path})
if route_path == "/-/routes":
return await starlette.responses.JSONResponse(self.route_info)(
scope, receive, send
)
if route_path == "/-/healthz":
return await starlette.responses.PlainTextResponse("success")(
scope, receive, send
)
route_prefix, handle = self.prefix_router.match_route(route_path)
if route_prefix is None:
self.request_error_counter.inc(
tags={"route": route_path, "error_code": "404"}
)
return await self._not_found(scope, receive, send)
# Modify the path and root path so that reverse lookups and redirection
# work as expected. We do this here instead of in replicas so it can be
# changed without restarting the replicas.
if route_prefix != "/":
assert not route_prefix.endswith("/")
scope["path"] = route_path.replace(route_prefix, "", 1)
scope["root_path"] = root_path + route_prefix
start_time = time.time()
status_code = await _send_request_to_handle(handle, scope, receive, send)
latency_ms = (time.time() - start_time) * 1000.0
logger.info(
access_log_msg(
method=scope["method"],
route=route_prefix,
status=str(status_code),
latency_ms=latency_ms,
)
)
if status_code != "200":
self.request_error_counter.inc(
tags={"route": route_path, "error_code": status_code}
)
self.deployment_request_error_counter.inc(
tags={"deployment": handle.deployment_name}
)
async def handle_request(self, request: Query) -> asyncio.Future:
async with self.rwlock.reader_lock:
num_running_requests = self._get_handle_request_stats()["running"]
self.num_processing_items.set(num_running_requests)
start_time = time.time()
result, success = await self.invoke_single(request)
latency_ms = (time.time() - start_time) * 1000
self.processing_latency_tracker.observe(latency_ms)
logger.info(
access_log_msg(
method="HANDLE",
route=request.metadata.call_method,
status="OK" if success else "ERROR",
latency_ms=latency_ms,
))
# Returns a small object for router to track request status.
return b"", result