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Wang Dequan
446
lib/python/mtc/device_model.py
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446
lib/python/mtc/device_model.py
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# Copyright (C) 2026 LinuxCNC contributors
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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# Build the MTConnectDevices (/probe) document for a LinuxCNC machine.
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#
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# The document is "hybrid": a standard MTConnect component tree (Controller,
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# Path, Axes with Linear/Rotary components and Motion elements) plus a compact
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# LinuxCNC extension block (<x:Kinematics>) carrying the kins module name, the
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# coordinates string and the joint<->axis map -- the primary contract for a
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# FreeCAD auto-configuration plugin.
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#
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# The DataItems themselves come from the shared registry (observations.py) so
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# the probe and the /current and /sample streams cannot drift apart.
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#
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# Run standalone to dump a probe document from an INI file:
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# python3 -m mtc.device_model path/to/machine.ini
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import re
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import sys
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import xml.etree.ElementTree as ET
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from dataclasses import dataclass, field
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from .ini_reader import IniReader
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from .observations import build_dataitems, EXT_NS
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from .hal_items import parse_hal_items, resolve_component
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from . import kinematics as kin
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MTC_NS = "urn:mtconnect.org:MTConnectDevices:1.7"
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XSI_NS = "http://www.w3.org/2001/XMLSchema-instance"
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SCHEMA_VERSION = "1.7"
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_LINEAR_UNITS = {
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"mm": "MILLIMETER", "metric": "MILLIMETER", "millimeter": "MILLIMETER",
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"inch": "INCH", "imperial": "INCH", "in": "INCH", "cm": "CENTIMETER",
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}
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_ANGULAR_UNITS = {
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"degree": "DEGREE", "degrees": "DEGREE", "deg": "DEGREE",
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"radian": "RADIAN", "grad": "DEGREE",
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}
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# Factor that converts a native length value to millimetres (the MTConnect
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# canonical length unit). Everything emitted is metric; nativeUnits records the
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# source so a consumer can recover the original.
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_LINEAR_SCALE = {"MILLIMETER": 1.0, "INCH": 25.4, "CENTIMETER": 10.0}
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@dataclass
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class DeviceConfig:
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name: str = "linuxcnc"
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uuid: str = "linuxcnc-0001"
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manufacturer: str = "LinuxCNC"
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linear_units: str = "MILLIMETER" # canonical emitted unit (always mm)
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native_linear_units: str = "MILLIMETER" # the machine's own unit (INCH/...)
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linear_scale: float = 1.0 # native length * scale -> millimetres
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angular_units: str = "DEGREE"
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instance_id: str = "1"
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spindle_speed_min: float = None # [SPINDLE_0] MIN_FORWARD_VELOCITY (RPM)
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spindle_speed_max: float = None # [SPINDLE_0] MAX_FORWARD_VELOCITY (RPM)
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hal_items: list = field(default_factory=list) # [MTCONNECT]HAL_ITEM data items
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@property
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def device_id(self):
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"""NCName-safe id for the Device component (name may have spaces)."""
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return "dev_%s" % _nc(self.name)
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@classmethod
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def from_ini(cls, ini):
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lin = (ini.find("TRAJ", "LINEAR_UNITS", "mm") or "mm").strip().lower()
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ang = (ini.find("TRAJ", "ANGULAR_UNITS", "degree") or "degree").strip().lower()
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native_lin = _LINEAR_UNITS.get(lin, "MILLIMETER")
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# Spindle 0 usable speed band (RPM); modern configs use [SPINDLE_0],
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# older ones an unnumbered [SPINDLE]. Only carried through if present.
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sp = "SPINDLE_0" if ini.has_section("SPINDLE_0") else "SPINDLE"
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return cls(
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name=ini.find("MTCONNECT", "DEVICE_NAME",
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ini.find("EMC", "MACHINE", "linuxcnc")) or "linuxcnc",
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uuid=ini.find("MTCONNECT", "UUID", "linuxcnc-0001") or "linuxcnc-0001",
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linear_units="MILLIMETER",
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native_linear_units=native_lin,
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linear_scale=_LINEAR_SCALE.get(native_lin, 1.0),
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angular_units=_ANGULAR_UNITS.get(ang, "DEGREE"),
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spindle_speed_min=ini.find_float(sp, "MIN_FORWARD_VELOCITY"),
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spindle_speed_max=ini.find_float(sp, "MAX_FORWARD_VELOCITY"),
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hal_items=parse_hal_items(ini),
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)
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# Namespaces are declared as literal xmlns attributes on the root (below) and
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# tags are written with plain / prefixed names. This avoids ElementTree's
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# global register_namespace() state, which mis-handles several default
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# namespaces in one process. Serialized output round-trips through any
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# namespace-aware parser exactly as if {uri}Tag had been used.
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def _t(tag):
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return tag
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def _x(tag):
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return "x:" + tag
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def _fmt_vec(vec):
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return " ".join(("%g" % (c if c != 0 else 0.0)) for c in vec) # avoid -0
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def _nc(s):
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"""Coerce an arbitrary string into a valid XML NCName for id attributes.
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Machine names may contain spaces or punctuation (e.g. 'xyzac (switchkins)')
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which are legal in the MTConnect name attribute but not in an id/NCName.
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"""
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s = re.sub(r"[^A-Za-z0-9_.-]", "_", s or "")
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if not s or not (s[0].isalpha() or s[0] == "_"):
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s = "_" + s
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return s
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def build_device_element(model, config, models=None):
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"""Build the <Device> element (standard tree + kinematics extension)."""
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dev = ET.Element(_t("Device"),
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{"id": config.device_id, "name": config.name,
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"uuid": config.uuid})
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# The compact LinuxCNC kinematics block is an extension element. The only
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# schema-valid host for foreign-namespace elements is a Description (its
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# content model is a lax xs:any); putting it here keeps the whole document
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# valid against the standard MTConnectDevices schema.
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desc = ET.SubElement(dev, _t("Description"), {"manufacturer": config.manufacturer})
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_build_kinematics_extension(desc, model, config)
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# Device-level Configuration: the WORLD/MACHINE coordinate systems are always
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# emitted so every Motion/SolidModel coordinateSystemIdRef='machine' resolves;
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# the static frame SolidModel is added only when geometry is configured.
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cfg = ET.SubElement(dev, _t("Configuration"))
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_build_coordinate_systems(cfg)
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if models and models.enabled() and models.base:
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_solid_model(cfg, "dev_base_model", models.base, models)
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# containers maps a component id to its (created, empty) <DataItems> element;
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# the registry loop below fills them so probe and streams stay in lockstep.
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containers = {}
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containers[config.device_id] = ET.SubElement(dev, _t("DataItems"))
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components = ET.SubElement(dev, _t("Components"))
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_build_controller(components, containers)
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_build_axes(components, model, config, containers, models)
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_build_systems(components, containers)
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_build_auxiliaries(components, containers, model, config)
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for di in build_dataitems(model, config):
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parent = containers.get(di.comp_id)
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if parent is not None:
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_emit_dataitem(parent, di)
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return dev
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def _emit_dataitem(parent, di):
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type_ = ("x:" + di.type) if di.ext else di.type
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attrs = {"category": di.category, "type": type_, "id": di.id}
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if di.subType:
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attrs["subType"] = di.subType
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if di.units:
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attrs["units"] = di.units
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if di.native_units:
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attrs["nativeUnits"] = di.native_units
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if di.representation:
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attrs["representation"] = di.representation
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item = ET.SubElement(parent, _t("DataItem"), attrs)
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if di.constraints:
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constraints = ET.SubElement(item, _t("Constraints"))
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if di.constraints.get("minimum") is not None:
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ET.SubElement(constraints, _t("Minimum")).text = "%g" % di.constraints["minimum"]
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if di.constraints.get("maximum") is not None:
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ET.SubElement(constraints, _t("Maximum")).text = "%g" % di.constraints["maximum"]
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def _build_controller(parent, containers):
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ctrl = ET.SubElement(parent, _t("Controller"), {"id": "ctrl", "name": "controller"})
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containers["ctrl"] = ET.SubElement(ctrl, _t("DataItems"))
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paths = ET.SubElement(ctrl, _t("Components"))
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path = ET.SubElement(paths, _t("Path"), {"id": "path", "name": "path"})
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containers["path"] = ET.SubElement(path, _t("DataItems"))
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def _build_axes(parent, model, config, containers, models=None):
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axes = ET.SubElement(parent, _t("Axes"), {"id": "axes", "name": "axes"})
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comps = ET.SubElement(axes, _t("Components"))
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for axis in model.axes:
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_build_motion_axis(comps, axis, containers, models, config, model.is_serial)
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_build_spindle(comps, containers, models, config)
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def _build_motion_axis(parent, axis, containers, models=None, config=None,
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serial=True):
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is_linear = axis.kind == "LINEAR"
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aid = axis.letter.lower()
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comp = ET.SubElement(parent, _t("Linear" if is_linear else "Rotary"),
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{"id": "axis_%s" % aid, "name": axis.letter})
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cfg = ET.SubElement(comp, _t("Configuration"))
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motion = ET.SubElement(cfg, _t("Motion"), {
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"id": "motion_%s" % aid,
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"type": "PRISMATIC" if is_linear else "REVOLUTE",
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"actuation": "DIRECT",
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"coordinateSystemIdRef": "machine",
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})
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# Chain this link to its parent link's motion so the twin nests transforms.
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if models and models.enabled():
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parent_id = models.parent_of("axis_%s" % aid)
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if parent_id and parent_id.startswith("axis_"):
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motion.set("parentIdRef", "motion_%s" % parent_id.split("_", 1)[1])
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# The direction vector is only meaningful when the axis is an orthogonal
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# Cartesian DOF; for non-serial kinematics it is not INI-derivable, so the
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# Motion element carries type/actuation but no (misleading) direction.
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if serial:
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vec = axis.vector
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if models and axis.letter in models.invert:
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vec = tuple(-c for c in vec) # work-carrying axis moves opposite
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ET.SubElement(motion, _t("Axis")).text = _fmt_vec(vec)
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if models and axis.letter in models.axis:
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_solid_model(cfg, "model_%s" % aid, models.axis[axis.letter], models)
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# Mirror the travel limits as a standard Specification so non-LinuxCNC
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# consumers get the work envelope without reading the x:Kinematics block.
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_axis_specification(cfg, axis, config)
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containers["axis_%s" % aid] = ET.SubElement(comp, _t("DataItems"))
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def _axis_specification(cfg, axis, config):
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if axis.min_limit is None and axis.max_limit is None:
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return
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is_linear = axis.kind == "LINEAR"
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scale = (config.linear_scale if (config and is_linear) else 1.0)
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units = ((config.linear_units if config else "MILLIMETER") if is_linear
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else (config.angular_units if config else "DEGREE"))
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dtype = "POSITION" if is_linear else "ANGLE"
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specs = ET.SubElement(cfg, _t("Specifications"))
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# NB: SpecificationType has no nativeUnits attribute; values are canonical.
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attrs = {"id": "axis_%s_travel" % axis.letter.lower(), "type": dtype,
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"units": units, "name": "%s travel" % axis.letter}
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spec = ET.SubElement(specs, _t("Specification"), attrs)
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if axis.max_limit is not None:
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ET.SubElement(spec, _t("Maximum")).text = "%g" % (axis.max_limit * scale)
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if axis.min_limit is not None:
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ET.SubElement(spec, _t("Minimum")).text = "%g" % (axis.min_limit * scale)
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def _build_spindle(parent, containers, models=None, config=None):
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comp = ET.SubElement(parent, _t("Rotary"), {"id": "spindle", "name": "S"})
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has_spec = config is not None and (config.spindle_speed_min is not None
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or config.spindle_speed_max is not None)
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if (models and models.spindle) or has_spec:
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cfg = ET.SubElement(comp, _t("Configuration"))
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if has_spec:
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_spindle_specifications(cfg, config)
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if models and models.spindle:
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_solid_model(cfg, "model_spindle", models.spindle, models)
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containers["spindle"] = ET.SubElement(comp, _t("DataItems"))
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def _spindle_specifications(cfg, config):
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"""Spindle usable speed band as a standard MTConnect Specification."""
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specs = ET.SubElement(cfg, _t("Specifications"))
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spec = ET.SubElement(specs, _t("Specification"), {
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"id": "spdl_speed_spec", "type": "ROTARY_VELOCITY",
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"units": "REVOLUTION/MINUTE", "name": "spindle speed",
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})
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if config.spindle_speed_max is not None:
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ET.SubElement(spec, _t("Maximum")).text = "%g" % config.spindle_speed_max
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if config.spindle_speed_min is not None:
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ET.SubElement(spec, _t("Minimum")).text = "%g" % config.spindle_speed_min
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def _build_systems(parent, containers):
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"""Systems container with a Coolant component (flood/mist events)."""
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systems = ET.SubElement(parent, _t("Systems"), {"id": "systems", "name": "systems"})
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comps = ET.SubElement(systems, _t("Components"))
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coolant = ET.SubElement(comps, _t("Coolant"), {"id": "coolant", "name": "coolant"})
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containers["coolant"] = ET.SubElement(coolant, _t("DataItems"))
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def _build_auxiliaries(parent, containers, model, config):
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"""Host generic user HAL items ([MTCONNECT]HAL_ITEM) that target the default
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'sensors' component, in an Auxiliaries > Sensor container. Items that target
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an existing component (spindle, controller, path, an axis) land there instead
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and need nothing here.
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"""
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wants_sensor = any(resolve_component(it.component, model)[0] == "sensors"
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for it in getattr(config, "hal_items", None) or [])
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if not wants_sensor:
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return
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aux = ET.SubElement(parent, _t("Auxiliaries"), {"id": "aux", "name": "aux"})
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comps = ET.SubElement(aux, _t("Components"))
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sensor = ET.SubElement(comps, _t("Sensor"), {"id": "sensors", "name": "sensors"})
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containers["sensors"] = ET.SubElement(sensor, _t("DataItems"))
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def _build_coordinate_systems(cfg):
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cs = ET.SubElement(cfg, _t("CoordinateSystems"))
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ET.SubElement(cs, _t("CoordinateSystem"),
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{"id": "world", "type": "WORLD", "name": "world"})
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machine = ET.SubElement(cs, _t("CoordinateSystem"),
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{"id": "machine", "type": "MACHINE", "name": "machine",
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"parentIdRef": "world"})
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ET.SubElement(machine, _t("Origin")).text = "0 0 0"
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def _solid_model(cfg, sid, ref, models):
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# NB: the MTConnect SolidModel element has no units/nativeUnits attributes;
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# served geometry is expected in the canonical millimetre coordinate space.
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ET.SubElement(cfg, _t("SolidModel"), {
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"id": sid,
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"href": "/models/%s" % ref.name,
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"mediaType": ref.media,
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"coordinateSystemIdRef": "machine",
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})
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def _build_kinematics_extension(parent, model, config):
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"""Compact LinuxCNC-specific kinematic block for auto-configuration.
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Linear limits are converted to millimetres (matching every other emitted
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length); linearUnits / nativeLinearUnits record the canonical and source
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units so a consumer can recover the machine's native values.
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"""
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lin = getattr(config, "linear_scale", 1.0)
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k = ET.SubElement(parent, _x("Kinematics"), {
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"module": model.kins_module,
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"coordinates": model.coordinates,
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"joints": str(model.joints_count),
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"linearUnits": config.linear_units,
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"nativeLinearUnits": config.native_linear_units,
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})
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if model.kins_params:
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k.set("params", model.kins_params)
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if model.kinematics_type:
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k.set("type", model.kinematics_type)
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jmap = ET.SubElement(k, _x("JointMap"))
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for joint in model.joints:
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js = lin if joint.kind == "LINEAR" else 1.0
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attrs = {"number": str(joint.number), "kind": joint.kind}
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if joint.axis and model.is_serial:
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attrs["axis"] = joint.axis
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_set_num(attrs, "min", joint.min_limit, js)
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_set_num(attrs, "max", joint.max_limit, js)
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_set_num(attrs, "home", joint.home, js)
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_set_num(attrs, "homeOffset", joint.home_offset, js)
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ET.SubElement(jmap, _x("Joint"), attrs)
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for axis in model.axes:
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axs = lin if axis.kind == "LINEAR" else 1.0
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attrs = {"name": axis.letter, "kind": axis.kind}
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if model.is_serial:
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attrs["vector"] = _fmt_vec(axis.vector)
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_set_num(attrs, "min", axis.min_limit, axs)
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_set_num(attrs, "max", axis.max_limit, axs)
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ET.SubElement(k, _x("Axis"), attrs)
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def _set_num(attrs, key, value, scale=1.0):
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if value is not None:
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attrs[key] = "%g" % (value * scale)
|
||||
|
||||
|
||||
def build_probe_tree(model, config, creation_time="1970-01-01T00:00:00Z",
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asset_count=0, models=None):
|
||||
"""Build the full <MTConnectDevices> ElementTree root."""
|
||||
root = ET.Element("MTConnectDevices", {
|
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"xmlns": MTC_NS,
|
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"xmlns:xsi": XSI_NS,
|
||||
"xmlns:x": EXT_NS,
|
||||
"xsi:schemaLocation":
|
||||
"urn:mtconnect.org:MTConnectDevices:%s "
|
||||
"http://schemas.mtconnect.org/schemas/MTConnectDevices_%s.xsd"
|
||||
% (SCHEMA_VERSION, SCHEMA_VERSION),
|
||||
})
|
||||
ET.SubElement(root, _t("Header"), {
|
||||
"creationTime": creation_time,
|
||||
"sender": "linuxcnc-mtconnect",
|
||||
"instanceId": config.instance_id,
|
||||
"version": SCHEMA_VERSION,
|
||||
"deviceModelChangeTime": creation_time,
|
||||
"assetCount": str(asset_count),
|
||||
"assetBufferSize": "1024",
|
||||
"bufferSize": "131072",
|
||||
})
|
||||
devices = ET.SubElement(root, _t("Devices"))
|
||||
# The schema requires an Agent device alongside the machine Device(s); it
|
||||
# is the self-description of this agent process.
|
||||
_build_agent_element(devices, config)
|
||||
devices.append(build_device_element(model, config, models))
|
||||
return root
|
||||
|
||||
|
||||
def _build_agent_element(devices, config):
|
||||
agent = ET.SubElement(devices, _t("Agent"), {
|
||||
"id": "agent_%s" % _nc(config.name), "name": "%s_agent" % config.name,
|
||||
"uuid": "%s_agent" % config.uuid, "mtconnectVersion": SCHEMA_VERSION,
|
||||
})
|
||||
ET.SubElement(agent, _t("Description"),
|
||||
{"manufacturer": "LinuxCNC"}).text = "LinuxCNC MTConnect agent"
|
||||
items = ET.SubElement(agent, _t("DataItems"))
|
||||
ET.SubElement(items, _t("DataItem"),
|
||||
{"category": "EVENT", "type": "AVAILABILITY", "id": "agent_avail"})
|
||||
for t in ("DEVICE_ADDED", "DEVICE_REMOVED", "DEVICE_CHANGED"):
|
||||
ET.SubElement(items, _t("DataItem"),
|
||||
{"category": "EVENT", "type": t, "id": "agent_%s" % t.lower()})
|
||||
|
||||
|
||||
def probe_xml(model, config, models=None, **kwargs):
|
||||
"""Return the pretty-printed MTConnectDevices document as a string."""
|
||||
root = build_probe_tree(model, config, models=models, **kwargs)
|
||||
ET.indent(root, space=" ")
|
||||
body = ET.tostring(root, encoding="unicode")
|
||||
return '<?xml version="1.0" encoding="UTF-8"?>\n' + body + "\n"
|
||||
|
||||
|
||||
def probe_from_ini(ini_path, **kwargs):
|
||||
"""Convenience: build a probe document straight from an INI file path."""
|
||||
from .models import build_models
|
||||
ini = IniReader(ini_path)
|
||||
model = kin.build_model(ini)
|
||||
config = DeviceConfig.from_ini(ini)
|
||||
return probe_xml(model, config, models=build_models(ini, model, config), **kwargs)
|
||||
|
||||
|
||||
def _main(argv):
|
||||
if len(argv) != 2:
|
||||
sys.stderr.write("usage: python3 -m mtc.device_model MACHINE.ini\n")
|
||||
return 2
|
||||
sys.stdout.write(probe_from_ini(argv[1]))
|
||||
return 0
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
sys.exit(_main(sys.argv))
|
||||
Reference in New Issue
Block a user