[#17016][refactor] Isolate SMG gRPC protocol integration - #17221
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Signed-off-by: Connor Carpenter <connorc@nvidia.com>
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August 3, 2026 21:54
Contributor
WalkthroughThe ChangesSMG gRPC server foundation
Serve command protocol routing
Estimated code review effort: 3 (Moderate) | ~25 minutes Possibly related issues
Possibly related PRs
Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant CLI
participant serve
participant launch_server
participant TensorRTLLMBackend
participant AsyncGRPCServer
CLI->>serve: pass --grpc --grpc-protocol smg
serve->>launch_server: forward host, port, LLM arguments, and model name
launch_server->>TensorRTLLMBackend: initialize backend
launch_server->>AsyncGRPCServer: register SMG service and start
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
Comment |
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@tensorrt_llm/grpc/smg/__init__.py`:
- Around line 40-74: The optional protobuf fallback in the module-level imports
causes request_manager and servicer imports to fail with an unclear
AttributeError when smg-grpc-proto is unavailable. Update the import flow around
PROTOS_AVAILABLE, REQUEST_MANAGER_AVAILABLE, and SERVICER_AVAILABLE so
protobuf-dependent modules are imported only after validating the generated
protobuf package, or raise a clear installation error before those imports;
preserve normal imports when smg-grpc-proto is installed.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (8)
tensorrt_llm/commands/serve.pytensorrt_llm/grpc/__init__.pytensorrt_llm/grpc/smg/__init__.pytensorrt_llm/grpc/smg/request_manager.pytensorrt_llm/grpc/smg/server.pytensorrt_llm/grpc/smg/servicer.pytests/unittest/api_stability/references/trtllm_serve_cli.yamltests/unittest/grpc/smg/test_server.py
Comment on lines
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+74
| # Try to import generated protobuf modules from smg-grpc-proto package | ||
| try: | ||
| from smg_grpc_proto.generated import trtllm_service_pb2, trtllm_service_pb2_grpc | ||
|
|
||
| PROTOS_AVAILABLE = True | ||
| except ImportError: | ||
| PROTOS_AVAILABLE = False | ||
| trtllm_service_pb2 = None | ||
| trtllm_service_pb2_grpc = None | ||
|
|
||
| # Try to import request manager | ||
| try: | ||
| from .request_manager import ( | ||
| GrpcRequestManager, | ||
| create_disaggregated_params_from_proto, | ||
| create_lora_request_from_proto, | ||
| create_sampling_params_from_proto, | ||
| ) | ||
|
|
||
| REQUEST_MANAGER_AVAILABLE = True | ||
| except ImportError: | ||
| REQUEST_MANAGER_AVAILABLE = False | ||
| GrpcRequestManager = None | ||
| create_sampling_params_from_proto = None | ||
| create_lora_request_from_proto = None | ||
| create_disaggregated_params_from_proto = None | ||
|
|
||
| # Try to import servicer | ||
| try: | ||
| from .servicer import TrtllmServiceServicer | ||
|
|
||
| SERVICER_AVAILABLE = True | ||
| except ImportError: | ||
| SERVICER_AVAILABLE = False | ||
| TrtllmServiceServicer = None |
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🩺 Stability & Availability | 🟠 Major
🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
# Inspect how request_manager.py and servicer.py reference the optional protobuf module,
# and confirm whether launch_server guards against missing smg-grpc-proto.
echo "=== smg/__init__.py ==="
cat -n tensorrt_llm/grpc/smg/__init__.py
echo "=== request_manager.py head (imports and type hints) ==="
sed -n '1,60p' tensorrt_llm/grpc/smg/request_manager.py
echo "=== servicer.py head (imports) ==="
sed -n '1,45p' tensorrt_llm/grpc/smg/servicer.py
echo "=== server.py (full) ==="
cat -n tensorrt_llm/grpc/smg/server.pyRepository: NVIDIA/TensorRT-LLM
Length of output: 12433
🏁 Script executed:
#!/bin/bash
set -eu
echo "=== protobuf references in request_manager.py and servicer.py ==="
rg -n -C 2 'pb2|trtllm_service_pb2' \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.py
echo "=== definitions with protobuf annotations ==="
rg -n -C 3 'def .*pb2|-> .*pb2|: .*pb2' \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.py
echo "=== package import dependency edges ==="
rg -n -C 2 'from \\. import|from \\.request_manager|from \\.servicer|class .*trtllm_service' \
tensorrt_llm/grpc/smg/__init__.py \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.py \
tensorrt_llm/grpc/smg/server.pyRepository: NVIDIA/TensorRT-LLM
Length of output: 24118
🏁 Script executed:
#!/bin/bash
set -eu
python3 - <<'PY'
from pathlib import Path
import ast
for name in (
"tensorrt_llm/grpc/smg/request_manager.py",
"tensorrt_llm/grpc/smg/servicer.py",
):
tree = ast.parse(Path(name).read_text())
print(f"=== {name} ===")
for node in ast.walk(tree):
if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef)):
annotations = []
for arg in [*node.args.posonlyargs, *node.args.args, *node.args.kwonlyargs]:
if arg.annotation is not None:
annotations.append(ast.unparse(arg.annotation))
if node.args.vararg and node.args.vararg.annotation:
annotations.append(ast.unparse(node.args.vararg.annotation))
if node.args.kwarg and node.args.kwarg.annotation:
annotations.append(ast.unparse(node.args.kwarg.annotation))
if node.returns is not None:
annotations.append(ast.unparse(node.returns))
if any("pb2" in annotation for annotation in annotations):
print(node.lineno, node.name, annotations)
PYRepository: NVIDIA/TensorRT-LLM
Length of output: 1904
🏁 Script executed:
#!/bin/bash
set -eu
echo "=== protobuf references in request_manager.py and servicer.py ==="
rg -n -C 2 'pb2|trtllm_service_pb2' \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.py
echo "=== definitions with protobuf annotations ==="
rg -n -C 3 'def .*pb2|-> .*pb2|: .*pb2' \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.py
echo "=== package import dependency edges ==="
rg -n -C 2 'from \\. import|from \\.request_manager|from \\.servicer|class .*trtllm_service' \
tensorrt_llm/grpc/smg/__init__.py \
tensorrt_llm/grpc/smg/request_manager.py \
tensorrt_llm/grpc/smg/servicer.pyRepository: NVIDIA/TensorRT-LLM
Length of output: 24118
🏁 Script executed:
#!/bin/bash
set -eu
python3 - <<'PY'
from pathlib import Path
import ast
for name in (
"tensorrt_llm/grpc/smg/request_manager.py",
"tensorrt_llm/grpc/smg/servicer.py",
):
tree = ast.parse(Path(name).read_text())
print(f"=== {name} ===")
for node in ast.walk(tree):
if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef)):
annotations = []
for arg in [
*node.args.posonlyargs,
*node.args.args,
*node.args.kwonlyargs,
]:
if arg.annotation is not None:
annotations.append(ast.unparse(arg.annotation))
if node.args.vararg and node.args.vararg.annotation:
annotations.append(ast.unparse(node.args.vararg.annotation))
if node.args.kwarg and node.args.kwarg.annotation:
annotations.append(ast.unparse(node.args.kwarg.annotation))
if node.returns is not None:
annotations.append(ast.unparse(node.returns))
if any("pb2" in annotation for annotation in annotations):
print(node.lineno, node.name, annotations)
PYRepository: NVIDIA/TensorRT-LLM
Length of output: 1904
Fail clearly when smg-grpc-proto is missing. request_manager.py evaluates pb2.* annotations during import, so the None fallback raises AttributeError before launch_server() runs. Make these imports lazy or raise a clear error before importing them, such as Install smg-grpc-proto to use --grpc.
[medium_effort_and_high_reward]
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@tensorrt_llm/grpc/smg/__init__.py` around lines 40 - 74, The optional
protobuf fallback in the module-level imports causes request_manager and
servicer imports to fail with an unclear AttributeError when smg-grpc-proto is
unavailable. Update the import flow around PROTOS_AVAILABLE,
REQUEST_MANAGER_AVAILABLE, and SERVICER_AVAILABLE so protobuf-dependent modules
are imported only after validating the generated protobuf package, or raise a
clear installation error before those imports; preserve normal imports when
smg-grpc-proto is installed.
Author
|
Superseded by #17084, which now contains this SMG refactor together with the OpenEngine stub and the shared |
This was referenced Aug 3, 2026
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Dev Engineer Review
tensorrt_llm.grpc.smg.tensorrt_llm.grpcprotocol-neutral.tensorrt_llm.grpc.smg.server.launch_server.--grpc-protocol {smg,openengine}.smgas the default protocol.openengineuntil its follow-up implementation is available.QA Engineer Review
tests/unittest/grpc/smg/test_server.py.tests/integration/test_lists/files were modified, so CI or manual-QA list coverage is not declared.Description
grpc/smgdirectories.tensorrt_llm.grpcprotocol-neutral.--grpc-protocol {smg,openengine}withsmgas the backward-compatible default for--grpc.Related RFC: #17016.
Maintainer action: please apply the
api-compatiblelabel; GitHub does not grant external contributors permission to label upstream PRs.Test Coverage
tests/unittest/grpc/smg/test_server.py.trtllm-serveCLI stability reference for--grpc-protocol.pre-commit run --files <changed files>python3 -m py_compile <changed Python files>The local rc21 container's compiled bindings predate the current
mainAPIs, so the Python suites require upstream CI's matching build.PR Checklist
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If PR introduces API changes, an appropriate PR label is added - either
api-compatibleorapi-breaking. Forapi-breaking, includeBREAKINGin the PR title.Any new dependencies have been scanned for license and vulnerabilities
CODEOWNERS updated if ownership changes
Documentation updated as needed
Update tava architecture diagram if there is a significant design change in PR.
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Please check this after reviewing the above items as appropriate for this PR.
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