Gateway Architecture & Routing

"""Gateway signal routing table."""
from dataclasses import dataclass
from typing import List, Optional

@dataclass
class RoutingEntry:
    signal_name:  str
    source_bus:   str
    source_id:    int
    source_byte:  int
    source_bits:  int
    dest_bus:     str
    dest_id:      int
    dest_byte:    int
    factor:       float = 1.0
    offset:       float = 0.0
    filter_rule:  Optional[str] = None  # "range:0:250" etc.

GATEWAY_TABLE: List[RoutingEntry] = [
    # CAN powertrain -> CAN chassis (speed from engine ECU to ABS ECU)
    RoutingEntry("VehicleSpeed",
                 source_bus="CAN_PT", source_id=0x1A3,
                 source_byte=0, source_bits=16,
                 dest_bus="CAN_CHASSIS", dest_id=0x1A3,
                 dest_byte=0),
    # CAN chassis -> Ethernet backbone (speed for ADAS on HPC)
    RoutingEntry("VehicleSpeed_Eth",
                 source_bus="CAN_CHASSIS", source_id=0x1A3,
                 source_byte=0, source_bits=16,
                 dest_bus="ETH_BACKBONE", dest_id=0x0A01,  # SOME/IP
                 dest_byte=0,
                 filter_rule="range:0:250"),  # discard out-of-range
]

def validate_routing_table(table: List[RoutingEntry]) -> list:
    issues = []
    names = [e.signal_name for e in table]
    if len(names) != len(set(names)):
        issues.append("Duplicate signal names in routing table")
    return issues