[serve] Remove SLO code and blist dependency (#10075)

python/ray/serve/http_proxy.py

@@ -1,5 +1,4 @@
 import asyncio
-from urllib.parse import parse_qs
 import socket
 from typing import List
 
@@ -61,32 +60,6 @@ class HTTPProxy:
 
         return b"".join(body_buffer)
 
-    def _parse_latency_slo(self, scope):
-        query_string = scope["query_string"].decode("ascii")
-        query_kwargs = parse_qs(query_string)
-
-        relative_slo_ms = query_kwargs.pop("relative_slo_ms", None)
-        absolute_slo_ms = query_kwargs.pop("absolute_slo_ms", None)
-        relative_slo_ms = self._validate_slo_ms(relative_slo_ms)
-        absolute_slo_ms = self._validate_slo_ms(absolute_slo_ms)
-        if relative_slo_ms is not None and absolute_slo_ms is not None:
-            raise ValueError("Both relative and absolute slo's"
-                             "cannot be specified.")
-        return relative_slo_ms, absolute_slo_ms
-
-    def _validate_slo_ms(self, request_slo_ms):
-        if request_slo_ms is None:
-            return None
-        if len(request_slo_ms) != 1:
-            raise ValueError(
-                "Multiple SLO specified, please specific only one.")
-        request_slo_ms = request_slo_ms[0]
-        request_slo_ms = float(request_slo_ms)
-        if request_slo_ms < 0:
-            raise ValueError("Request SLO must be positive, it is {}".format(
-                request_slo_ms))
-        return request_slo_ms
-
     def _make_error_sender(self, scope, receive, send):
         async def sender(error_message, status_code):
             response = Response(error_message, status_code=status_code)
@@ -142,19 +115,10 @@ class HTTPProxy:
 
         http_body_bytes = await self.receive_http_body(scope, receive, send)
 
-        # get slo_ms before enqueuing the query
-        try:
-            relative_slo_ms, absolute_slo_ms = self._parse_latency_slo(scope)
-        except ValueError as e:
-            await error_sender(str(e), 400)
-            return
-
         headers = {k.decode(): v.decode() for k, v in scope["headers"]}
         request_metadata = RequestMetadata(
             endpoint_name,
             TaskContext.Web,
-            relative_slo_ms=relative_slo_ms,
-            absolute_slo_ms=absolute_slo_ms,
             call_method=headers.get("X-SERVE-CALL-METHOD".lower(), "__call__"),
             shard_key=headers.get("X-SERVE-SHARD-KEY".lower(), None),
         )