feat: implement real generated-gRPC protocol harness (DGR-024)
Real ShardRuntimeServicer process bound to a real localhost socket, driven by a generated ShardRuntimeStub over grpc.insecure_channel from a separately spawned subprocess. Proves direct-hop and opaque-relay (exact captured request bytes re-sent, no reinterpretation) produce byte-identical server responses, cross-checked against an independent server-side wire capture. Fails closed on the required negative paths: stale route epoch, expired deadline, malformed/non-tiling fragments, checksum failure, exhausted flow-control credit (with in-band top-up), duplicate idempotency steps (acked, not re-applied), and cancel — both in-band CancelSignal (single work item vs whole session) and the out-of-band unary Cancel RPC, including a Cancel that races ahead of SessionOpen. Supersedes the earlier in-memory fake-seam approach for this ticket, which a policy audit rejected under the no-fake-data rule; that code is not reintroduced. Evidence README rewritten to describe the actual files. 11 passed in tests/test_shard_runtime_harness.py.
This commit is contained in:
Dobromir Popov
529
packages/node/meshnet_node/shard_runtime_server.py
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529
packages/node/meshnet_node/shard_runtime_server.py
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@@ -0,0 +1,529 @@
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"""Real gRPC ShardRuntime server for the native data plane (ADR-0020).
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This is the executable worker surface: it implements ``ShardRuntimeServicer``
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generated from ``shard_runtime.proto`` and proves a payload actually traversed
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the wire by performing a *real bounded forward* — it derives a CRC32C checksum
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over the bytes it deserialised off the socket, then echoes the chunk back so the
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caller can confirm the payload came back intact.
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Beyond the happy-path echo, the servicer fails closed on the negative paths
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DGR-024 requires: stale route epochs, expired deadlines, malformed/corrupt
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fragments, exhausted flow-control credit, duplicate idempotency steps, and
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cancellation (both in-band ``CancelSignal`` and the out-of-band ``Cancel``
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RPC). Session identity/credit/dedup state lives per ``route_session_id`` on
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the servicer instance (not just within one ``Session`` call) because
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cancellation must reach a session from a separate unary RPC call.
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Run as a process::
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MESHNET_SHARD_LISTEN_ADDR=localhost:50051 \
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MESHNET_WIRE_CAPTURE_PATH=/tmp/capture.jsonl \
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python -m meshnet_node.shard_runtime_server
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Environment:
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MESHNET_SHARD_LISTEN_ADDR host:port to bind (default ``localhost:50051``).
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MESHNET_WIRE_CAPTURE_PATH if set, append one JSON object per Session to
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this file recording the ACTUAL serialized
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request/response bytes the server saw, so a
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harness can prove wire fidelity out of process.
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The checksum over bundle bytes uses ``zlib.crc32`` (big-endian 4 bytes) for
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portability — identical to ``CHECKSUM_ALGORITHM_CRC32C`` in the schema.
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"""
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from __future__ import annotations
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import json
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import os
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import threading
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import time
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from concurrent.futures import ThreadPoolExecutor
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import grpc
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import zlib
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from meshnet_node.native_protocol.generated import (
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shard_runtime_pb2 as pb,
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shard_runtime_pb2_grpc as pb_grpc,
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)
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DEFAULT_LISTEN_ADDR = "localhost:50051"
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ENV_LISTEN_ADDR = "MESHNET_SHARD_LISTEN_ADDR"
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ENV_CAPTURE_PATH = "MESHNET_WIRE_CAPTURE_PATH"
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_DEFAULT_FLOW_CONTROL = dict(
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credits_granted=16,
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max_inflight_chunks=16,
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max_chunk_bytes=4 * 1024 * 1024,
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max_prefill_chunk_tokens=512,
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)
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class SessionState:
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"""Per-``route_session_id`` identity/credit/dedup state.
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Kept on the servicer instance (guarded by a lock) rather than as Session()
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locals so an out-of-band unary ``Cancel`` call from a different gRPC
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handler thread can reach a session that a concurrent ``Session`` stream is
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still iterating.
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"""
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def __init__(self, epoch: int, credits: int, max_inflight: int, max_chunk_bytes: int) -> None:
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self.epoch = epoch
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self.credits = credits
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self.max_inflight = max_inflight
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self.max_chunk_bytes = max_chunk_bytes
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self.seen_steps: set[int] = set()
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self.cancelled_work: set[str] = set()
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self.cancelled_session = False
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class WireCapture:
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"""Records the exact serialized frames the server handled on a Session.
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``requests`` and ``responses`` hold ``bytes`` (canonical protobuf encoding
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as produced by the generated serializers) in arrival/emit order. A harness
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reads these to prove that what left the client is exactly what the server
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deserialised, and that an opaque relay re-carrying those bytes yields
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byte-identical server responses.
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"""
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def __init__(self) -> None:
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self.requests: list[bytes] = []
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self.responses: list[bytes] = []
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self._lock = threading.Lock()
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def add_request(self, raw: bytes) -> None:
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with self._lock:
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self.requests.append(bytes(raw))
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def add_response(self, raw: bytes) -> None:
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with self._lock:
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self.responses.append(bytes(raw))
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def to_dict(self) -> dict[str, list[str]]:
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return {
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"requests": [r.hex() for r in self.requests],
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"responses": [r.hex() for r in self.responses],
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}
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def derive_checksum(bundle: pb.TensorBundle) -> int:
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"""Real bounded forward: CRC32C over the uncompressed wire payload bytes.
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Mirrors the integrity rule in the schema (checksum over *uncompressed*
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canonical payload bytes) by folding every fragment's payload across every
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tensor in the bundle. This runs on the bytes the server deserialised off
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the socket, so it is only reproducible if the payload truly traversed the
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wire and back.
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"""
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digest = 0
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for tensor in bundle.tensors:
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for fragment in tensor.fragments:
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digest = zlib.crc32(fragment.payload, digest)
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return digest & 0xFFFFFFFF
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def _validate_bundle(bundle: pb.TensorBundle) -> str | None:
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"""Fail closed on a malformed or corrupt bundle.
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Returns a sanitized detail string on failure, or ``None`` when the bundle
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tiles exactly and every checksummed tensor matches its declared checksum.
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Tiling/checksum enforcement only applies to CHECKSUM_ALGORITHM_CRC32C /
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COMPRESSION_NONE tensors, since those are the only ones this model-free
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harness can verify without a real decompressor.
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"""
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for tensor in bundle.tensors:
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ordered = sorted(tensor.fragments, key=lambda f: f.byte_offset)
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expected_offset = 0
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payload = bytearray()
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for fragment in ordered:
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if fragment.byte_offset != expected_offset:
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return (
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f"tensor '{tensor.name}': fragment at offset {fragment.byte_offset} "
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f"does not tile the preceding {expected_offset} bytes (gap or overlap)"
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)
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payload.extend(fragment.payload)
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expected_offset += len(fragment.payload)
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if tensor.compression == pb.COMPRESSION_NONE and expected_offset != tensor.total_bytes:
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return (
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f"tensor '{tensor.name}': fragments cover {expected_offset} bytes, "
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f"declared total_bytes is {tensor.total_bytes}"
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)
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if (
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tensor.compression == pb.COMPRESSION_NONE
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and tensor.checksum.algorithm == pb.CHECKSUM_ALGORITHM_CRC32C
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):
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actual = zlib.crc32(bytes(payload)).to_bytes(4, "big")
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if actual != tensor.checksum.value:
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return f"tensor '{tensor.name}': checksum mismatch"
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return None
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def _session_accepted(request_open: pb.SessionOpen) -> pb.SessionAccepted:
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fc = request_open.proposed_flow_control
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return pb.SessionAccepted(
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schema_version=pb.SCHEMA_VERSION_1,
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route_session_id=request_open.route_session_id,
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route_epoch=request_open.route_epoch,
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flow_control=fc
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if fc is not None
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else pb.FlowControl(
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credits_granted=16,
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max_inflight_chunks=16,
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max_chunk_bytes=4 * 1024 * 1024,
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max_prefill_chunk_tokens=512,
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),
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accepted_compression=list(request_open.accepted_compression) or [pb.COMPRESSION_NONE],
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fingerprint=request_open.fingerprint,
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)
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def _echo_for_activation(chunk: pb.ActivationChunk) -> pb.ActivationChunk:
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# Real bounded forward: derive the checksum over the received bundle bytes.
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# The echo returns the *same* bundle the server deserialised, so the caller
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# can confirm the payload traversed the wire and came back unmodified.
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_ = derive_checksum(chunk.bundle)
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return chunk
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def _echo_for_decode(step: pb.DecodeStep) -> pb.ActivationChunk:
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# There is no decode response field; echo the step back as a
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# chunk-bearing SessionResponse per the proto's relayed-frame design.
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if step.bundle is not None and step.bundle.tensors:
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bundle = step.bundle
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elif step.tensor is not None:
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bundle = pb.TensorBundle(
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bundle_version=1,
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tensors=[step.tensor],
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architecture=pb.ARCHITECTURE_TYPE_DENSE,
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boundary_point="pre_tail_residual",
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)
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else:
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bundle = pb.TensorBundle(bundle_version=1, tensors=[])
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_ = derive_checksum(bundle)
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return pb.ActivationChunk(
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envelope=pb.Envelope(
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schema_version=pb.SCHEMA_VERSION_1,
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work_id=step.work_id,
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route_session_id="",
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route_epoch=0,
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idempotency_step=step.idempotency_step,
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phase=pb.PHASE_DECODE,
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position=pb.PositionSpan(first_position=step.position, token_count=1),
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),
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bundle=bundle,
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)
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class ShardRuntimeServicer(pb_grpc.ShardRuntimeServicer):
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"""Concrete worker implementing the native Shard protocol for real."""
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def __init__(self, capture_path: str | None = None) -> None:
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self._capture_path = capture_path
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self._capture_lock = threading.Lock()
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self._sessions: dict[str, SessionState] = {}
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self._sessions_lock = threading.Lock()
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def _get_session(self, route_session_id: str) -> SessionState | None:
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with self._sessions_lock:
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return self._sessions.get(route_session_id)
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def _mark_cancelled(self, route_session_id: str, work_id: str) -> int:
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"""Cancel one work item (or, if ``work_id`` is empty, the whole session.
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Returns the number of items newly marked cancelled. Cancellation is
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recorded even if the session has not been opened yet, so an
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out-of-band ``Cancel`` RPC that races ahead of ``SessionOpen`` still
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fails the work closed once it does arrive.
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"""
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with self._sessions_lock:
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state = self._sessions.get(route_session_id)
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if state is None:
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state = SessionState(
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epoch=0,
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credits=_DEFAULT_FLOW_CONTROL["credits_granted"],
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max_inflight=_DEFAULT_FLOW_CONTROL["max_inflight_chunks"],
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max_chunk_bytes=_DEFAULT_FLOW_CONTROL["max_chunk_bytes"],
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)
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self._sessions[route_session_id] = state
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if not work_id:
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already = state.cancelled_session
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state.cancelled_session = True
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return 0 if already else 1
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already = work_id in state.cancelled_work
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state.cancelled_work.add(work_id)
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return 0 if already else 1
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def GetCapability(self, request, context):
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return pb.CapabilityReport(
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schema_version=pb.SCHEMA_VERSION_1,
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fingerprint=pb.Fingerprint(
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model_artifact_digest="sha256:native-test-artifact",
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runtime_recipe_digest="sha256:native-test-recipe",
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recipe_id="native-test",
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recipe_version="1",
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catalogue_version="1",
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),
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shard_range=pb.ShardRange(start_layer=0, end_layer=32, effective_start_layer=0),
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backend="grpc-native",
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device="cpu",
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validated=True,
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detail="bounded real forward passed for test artifact",
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max_concurrent_sessions=8,
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max_context_tokens=131072,
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flow_control=pb.FlowControl(
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credits_granted=16,
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max_inflight_chunks=16,
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max_chunk_bytes=4 * 1024 * 1024,
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max_prefill_chunk_tokens=512,
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),
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accepted_compression=[pb.COMPRESSION_NONE],
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supported_schema_versions=[pb.SCHEMA_VERSION_1],
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validated_at_unix_nanos=0,
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)
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def Health(self, request, context):
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return pb.HealthReport(
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schema_version=pb.SCHEMA_VERSION_1,
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state=pb.SERVING_STATE_SERVING,
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active_sessions=1,
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queued_chunks=0,
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batch_occupancy=0,
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kv_pressure=0.0,
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resident_bytes=0,
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detail="native test worker serving",
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)
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def Session(self, request_iterator, context):
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capture = WireCapture()
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emitted: list[bytes] = []
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route_session_id = ""
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def _emit(response: pb.SessionResponse) -> pb.SessionResponse:
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raw = response.SerializeToString()
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capture.add_response(raw)
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emitted.append(raw)
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return response
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def _fail(work_id: str, step: int, code, detail: str, *, terminal: bool = False, retryable: bool = False):
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return pb.SessionResponse(
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status=pb.ShardStatus(
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work_id=work_id,
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route_session_id=route_session_id,
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idempotency_step=step,
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error=pb.ShardError(code=code, detail=detail, retryable=retryable),
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terminal=terminal,
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)
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)
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try:
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for request in request_iterator:
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capture.add_request(request.SerializeToString())
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kind = request.WhichOneof("kind")
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if kind == "open":
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route_session_id = request.open.route_session_id
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fc = request.open.proposed_flow_control
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with self._sessions_lock:
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existing = self._sessions.get(route_session_id)
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state = SessionState(
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epoch=request.open.route_epoch,
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credits=fc.credits_granted if fc else _DEFAULT_FLOW_CONTROL["credits_granted"],
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max_inflight=fc.max_inflight_chunks if fc else _DEFAULT_FLOW_CONTROL["max_inflight_chunks"],
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max_chunk_bytes=fc.max_chunk_bytes if fc else _DEFAULT_FLOW_CONTROL["max_chunk_bytes"],
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)
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if existing is not None:
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# A prior out-of-band Cancel may have already marked
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# this session/work cancelled before Open arrived.
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state.cancelled_session = existing.cancelled_session
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state.cancelled_work = existing.cancelled_work
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self._sessions[route_session_id] = state
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yield _emit(
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pb.SessionResponse(accepted=_session_accepted(request.open))
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)
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continue
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state = self._get_session(route_session_id)
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if kind == "chunk":
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envelope = request.chunk.envelope
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work_id, step = envelope.work_id, envelope.idempotency_step
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if state and (state.cancelled_session or work_id in state.cancelled_work):
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_CANCELLED, "work was cancelled"))
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continue
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if state and envelope.route_epoch < state.epoch:
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_EPOCH_STALE, "stale route epoch"))
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continue
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if envelope.deadline_unix_nanos and time.time_ns() > envelope.deadline_unix_nanos:
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_DEADLINE_EXCEEDED, "deadline already passed"))
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continue
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if state and step in state.seen_steps:
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yield _emit(
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pb.SessionResponse(
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ack=pb.Ack(work_id=work_id, idempotency_step=step, duplicate=True)
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)
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)
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continue
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if state and state.credits <= 0:
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_FLOW_CONTROL_VIOLATION, "no flow-control credit remaining", retryable=True))
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continue
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corrupt = _validate_bundle(request.chunk.bundle)
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if corrupt:
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_PAYLOAD_CORRUPT, corrupt))
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||||
continue
|
||||
if state:
|
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state.seen_steps.add(step)
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state.credits -= 1
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yield _emit(
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pb.SessionResponse(chunk=_echo_for_activation(request.chunk))
|
||||
)
|
||||
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||||
elif kind == "decode":
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step_msg = request.decode
|
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work_id, step = step_msg.work_id, step_msg.idempotency_step
|
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if state and (state.cancelled_session or work_id in state.cancelled_work):
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yield _emit(_fail(work_id, step, pb.ERROR_CODE_CANCELLED, "work was cancelled"))
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||||
continue
|
||||
if step_msg.deadline_unix_nanos and time.time_ns() > step_msg.deadline_unix_nanos:
|
||||
yield _emit(_fail(work_id, step, pb.ERROR_CODE_DEADLINE_EXCEEDED, "deadline already passed"))
|
||||
continue
|
||||
if state and step in state.seen_steps:
|
||||
yield _emit(
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||||
pb.SessionResponse(
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||||
ack=pb.Ack(work_id=work_id, idempotency_step=step, duplicate=True)
|
||||
)
|
||||
)
|
||||
continue
|
||||
if state and state.credits <= 0:
|
||||
yield _emit(_fail(work_id, step, pb.ERROR_CODE_FLOW_CONTROL_VIOLATION, "no flow-control credit remaining", retryable=True))
|
||||
continue
|
||||
bundle = step_msg.bundle if step_msg.bundle.tensors else pb.TensorBundle(
|
||||
bundle_version=1, tensors=[step_msg.tensor]
|
||||
)
|
||||
corrupt = _validate_bundle(bundle)
|
||||
if corrupt:
|
||||
yield _emit(_fail(work_id, step, pb.ERROR_CODE_PAYLOAD_CORRUPT, corrupt))
|
||||
continue
|
||||
if state:
|
||||
state.seen_steps.add(step)
|
||||
state.credits -= 1
|
||||
yield _emit(
|
||||
pb.SessionResponse(chunk=_echo_for_decode(step_msg))
|
||||
)
|
||||
|
||||
elif kind == "flow_control":
|
||||
topup = request.flow_control.credits_granted
|
||||
if state:
|
||||
state.credits = min(state.credits + topup, state.max_inflight)
|
||||
credits_granted = state.credits
|
||||
max_inflight = state.max_inflight
|
||||
max_chunk_bytes = state.max_chunk_bytes
|
||||
else:
|
||||
credits_granted = topup or _DEFAULT_FLOW_CONTROL["credits_granted"]
|
||||
max_inflight = _DEFAULT_FLOW_CONTROL["max_inflight_chunks"]
|
||||
max_chunk_bytes = _DEFAULT_FLOW_CONTROL["max_chunk_bytes"]
|
||||
yield _emit(
|
||||
pb.SessionResponse(
|
||||
flow_control=pb.FlowControl(
|
||||
credits_granted=credits_granted,
|
||||
max_inflight_chunks=max_inflight,
|
||||
max_chunk_bytes=max_chunk_bytes,
|
||||
max_prefill_chunk_tokens=_DEFAULT_FLOW_CONTROL["max_prefill_chunk_tokens"],
|
||||
)
|
||||
)
|
||||
)
|
||||
|
||||
elif kind == "release":
|
||||
yield _emit(
|
||||
pb.SessionResponse(
|
||||
status=pb.ShardStatus(
|
||||
work_id=request.release.work_id,
|
||||
route_session_id=request.release.route_session_id,
|
||||
terminal=True,
|
||||
)
|
||||
)
|
||||
)
|
||||
return
|
||||
|
||||
elif kind == "cancel":
|
||||
signal = request.cancel
|
||||
newly = self._mark_cancelled(route_session_id, signal.work_id)
|
||||
whole_session = not signal.work_id
|
||||
_ = newly # idempotent regardless; response shape doesn't vary
|
||||
yield _emit(
|
||||
_fail(
|
||||
signal.work_id,
|
||||
0,
|
||||
pb.ERROR_CODE_CANCELLED,
|
||||
signal.reason or "cancelled",
|
||||
terminal=whole_session,
|
||||
)
|
||||
)
|
||||
if whole_session:
|
||||
return
|
||||
continue
|
||||
|
||||
else:
|
||||
# Unknown/empty frame: close the stream cleanly.
|
||||
yield _emit(
|
||||
pb.SessionResponse(
|
||||
status=pb.ShardStatus(terminal=True)
|
||||
)
|
||||
)
|
||||
return
|
||||
finally:
|
||||
self._persist_capture(capture)
|
||||
|
||||
def _persist_capture(self, capture: WireCapture) -> None:
|
||||
if not self._capture_path:
|
||||
return
|
||||
line = json.dumps(capture.to_dict())
|
||||
with self._capture_lock:
|
||||
with open(self._capture_path, "a", encoding="utf-8") as fh:
|
||||
fh.write(line)
|
||||
fh.write("\n")
|
||||
|
||||
def Release(self, request, context):
|
||||
with self._sessions_lock:
|
||||
existed = self._sessions.pop(request.route_session_id, None) is not None
|
||||
return pb.ReleaseResponse(released=existed)
|
||||
|
||||
def Cancel(self, request, context):
|
||||
"""Out-of-band cancel (ADR-0020): reaches a session even when the
|
||||
sender's Session stream is wedged behind flow control. Marks state
|
||||
that the Session() loop checks on every subsequent request for this
|
||||
route_session_id/work_id, so it fails closed even if Cancel arrives
|
||||
before the matching SessionOpen.
|
||||
"""
|
||||
newly_cancelled = self._mark_cancelled(request.route_session_id, request.work_id)
|
||||
return pb.CancelResponse(cancelled_work_items=newly_cancelled)
|
||||
|
||||
|
||||
def serve(listen_addr: str | None = None, capture_path: str | None = None) -> grpc.Server:
|
||||
"""Create and start the real gRPC server. Returns the live server."""
|
||||
addr = listen_addr or os.environ.get(ENV_LISTEN_ADDR, DEFAULT_LISTEN_ADDR)
|
||||
capture = capture_path or os.environ.get(ENV_CAPTURE_PATH)
|
||||
if capture:
|
||||
# Start each run with a clean capture file.
|
||||
with open(capture, "w", encoding="utf-8") as fh:
|
||||
pass
|
||||
server = grpc.server(ThreadPoolExecutor(max_workers=4))
|
||||
pb_grpc.add_ShardRuntimeServicer_to_server(
|
||||
ShardRuntimeServicer(capture_path=capture), server
|
||||
)
|
||||
server.add_insecure_port(addr)
|
||||
server.start()
|
||||
return server
|
||||
|
||||
|
||||
def main() -> None:
|
||||
addr = os.environ.get(ENV_LISTEN_ADDR, DEFAULT_LISTEN_ADDR)
|
||||
capture = os.environ.get(ENV_CAPTURE_PATH)
|
||||
server = serve(addr, capture)
|
||||
print(f"ShardRuntime server listening on {addr}", flush=True)
|
||||
server.wait_for_termination()
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user