decode_worker.py

# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import annotations

import logging

import sglang as sgl
from utils.protocol import DisaggPreprocessedRequest
from utils.sglang import parse_sglang_args

from dynamo.sdk import endpoint, service

logger = logging.getLogger(__name__)


@service(
    dynamo={
        "enabled": True,
        "namespace": "dynamo",
    },
    resources={"gpu": 1},
    workers=1,
)
class SGLangDecodeWorker:
    def __init__(self):
        class_name = self.__class__.__name__
        self.engine_args = parse_sglang_args(class_name, "")
        self.engine = sgl.Engine(server_args=self.engine_args)

        logger.warning("Decode worker initialized")

    @endpoint()
    async def generate(self, req: DisaggPreprocessedRequest):
        g = await self.engine.async_generate(
            input_ids=req.request.token_ids
            if req.request.batch_token_ids is None
            else req.request.batch_token_ids,
            sampling_params=req.sampling_params,
            stream=True,
            bootstrap_host=req.bootstrap_host,
            bootstrap_port=req.bootstrap_port,
            bootstrap_room=req.bootstrap_room,
        )

        async for result in g:
            yield result