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George Rawlinson 2 years ago
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.flake8
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[flake8]
select = B,B9,C,D,DAR,E,F,N,RST,S,W
ignore = E203,E501,RST201,RST203,RST301,W503
max-line-length = 80
max-complexity = 10
docstring-convention = google
per-file-ignores =
tests/*:S101
*/__init__.py:F401

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.gitignore vendored
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# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class
# C extensions
*.so
# Distribution / packaging
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
share/python-wheels/
*.egg-info/
.installed.cfg
*.egg
MANIFEST
# PyInstaller
# Usually these files are written by a python script from a template
# before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec
# Installer logs
pip-log.txt
pip-delete-this-directory.txt
# Unit test / coverage reports
htmlcov/
.tox/
.nox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
*.py,cover
.hypothesis/
.pytest_cache/
cover/
# Translations
*.mo
*.pot
# Django stuff:
*.log
local_settings.py
db.sqlite3
db.sqlite3-journal
# Flask stuff:
instance/
.webassets-cache
# Scrapy stuff:
.scrapy
# Sphinx documentation
docs/_build/
# PyBuilder
.pybuilder/
target/
# Jupyter Notebook
.ipynb_checkpoints
# IPython
profile_default/
ipython_config.py
# pyenv
# For a library or package, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
# .python-version
# pipenv
# According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
# However, in case of collaboration, if having platform-specific dependencies or dependencies
# having no cross-platform support, pipenv may install dependencies that don't work, or not
# install all needed dependencies.
#Pipfile.lock
# PEP 582; used by e.g. github.com/David-OConnor/pyflow
__pypackages__/
# Celery stuff
celerybeat-schedule
celerybeat.pid
# SageMath parsed files
*.sage.py
# Environments
.env
.venv
env/
venv/
ENV/
env.bak/
venv.bak/
# Spyder project settings
.spyderproject
.spyproject
# Rope project settings
.ropeproject
# mkdocs documentation
/site
# mypy
.mypy_cache/
.dmypy.json
dmypy.json
# Pyre type checker
.pyre/
# pytype static type analyzer
.pytype/
# Cython debug symbols
cython_debug/

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.pre-commit-config.yaml
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repos:
- repo: local
hooks:
- id: black
name: black
entry: black
language: system
types: [python]
require_serial: true
- id: flake8
name: flake8
entry: flake8
language: system
types: [python]
require_serial: true
- id: reorder-python-imports
name: Reorder python imports
entry: reorder-python-imports
language: system
types: [python]
args: [--application-directories=src]

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.python-version
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3.9.0
3.8.6
3.7.8
3.6.11

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LICENSE
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Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

40
Makefile
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.DEFAULT: help
.PHONY: help clean clean-pyc clean-build dist lint test tests docs
help:
@echo "clean : delete all artifacts"
@echo "clean-pyc : delete python cache artifacts"
@echo "clean-build : delete distribution artifacts"
@echo "dist : generate distribution artifacts"
@echo "lint : lint with black, flake8 & reorder-python-imports"
@echo "test : run tests with latest Python version"
@echo "coverage : run coverage tests with latest Python version"
@echo "tests : run tests with supported Python versions"
clean: clean-pyc clean-build
clean-pyc:
@find . -name '*.pyc' -delete
@find . -name '*.pyo' -delete
@find . -name __pycache__ -delete
clean-build:
@rm --force --recursive build dist src/*.egg-info docs/_build
dist: clean
poetry build
lint:
nox -rs precommit
test:
nox
coverage:
nox -rs coverage
tests:
nox -rs tests
docs:
nox -rs docs

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README.rst
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SMBMC
=====
An unofficial Python interface for obtaining metrics from Supermicro BMCs.
The following metrics are accessible:
- Sensor: Temperature, Fan, Voltage, etc.
- PMBus: Power Consumption, Fan, Temperature, etc.
**Note:** This library depends on the BMC web-interface being available.
Usage
-----
::
# smbmc_example.py
from smbmc import Client
# initialise client with connection details
c = Client(IPMI_SERVER, IPMI_USER, IPMI_PASS)
# retrieve session token
c.login()
# obtain sensor metrics
sensors = c.get_sensor_metrics()
# and pmbus metrics
power_supplies = c.get_pmbus_metrics()
# or, retrieve all known metrics
metrics = c.get_metrics()
Contributing
------------
This library has been tested on a system with the following components:
- Chassis: SC846 (unknown revision; possibly 846BA-R920B)
- Motherboard: CSE-PTJBOD-CB3
- Power Supply: PWS-920P-SQ
- Backplane: BPN-SAS2-846EL1
- Power Distribution Board: PDB-PT846-2824
If there are any errors or additional functionality for other components, please file an issue with as *much* detail as you can!
Legal
-----
This library is not associated with Super Micro Computer, Inc.
Supermicro have released some `BMC/IPMI <https://www.supermicro.com/wftp/GPL/SMT/SDK_SMT_X9_317.tar.gz>`_ code under the GPL, which has been used as a reference. Therefore, this library is licensed as GPLv3.

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docs/conf.py
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"""Sphinx configuration."""
# Configuration file for the Sphinx documentation builder.
#
# This file only contains a selection of the most common options. For a full
# list see the documentation:
# https://www.sphinx-doc.org/en/master/usage/configuration.html
# -- Path setup --------------------------------------------------------------
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
#
import os
import sys
try:
import importlib.metadata as metadata
except ImportError:
import importlib_metadata as metadata
from datetime import datetime
sys.path.insert(0, os.path.abspath(".."))
sys.path.insert(0, os.path.abspath("."))
# -- Project information -----------------------------------------------------
project = "smbmc"
author = "George Rawlinson"
copyright = f"{datetime.now().year}, {author}"
version = metadata.version(project)
release = version
# -- General configuration ---------------------------------------------------
# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = [
"sphinx.ext.autodoc",
"sphinx.ext.napoleon",
]
# Add any paths that contain templates here, relative to this directory.
templates_path = ["_templates"]
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
# This pattern also affects html_static_path and html_extra_path.
exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
# Autoclass configuration
autoclass_content = "both"
# -- Options for HTML output -------------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
#
html_theme = "alabaster"
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ["_static"]

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docs/index.rst
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Welcome to smbmc
================
.. autoclass:: smbmc.Client
:members:
:inherited-members:
.. toctree::
:hidden:
:maxdepth: 2
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

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noxfile.py
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"""Nox sessions."""
import functools
import os
from pathlib import Path
from textwrap import dedent
import nox
import nox_poetry
from nox.sessions import Session
# package name
package = "smbmc"
# python versions
supported_versions = ["3.6", "3.7", "3.8", "3.9"]
latest_version = supported_versions[-1]
# nox settings
nox.options.sessions = [f"tests-{latest_version}"]
nox.options.reuse_existing_virtualenvs = True
locations = ["src", "tests", "noxfile.py", "docs/conf.py"]
@nox.session(python=supported_versions)
def tests(session: Session) -> None:
"""Run the test suite.
Args:
session: The Session object.
"""
nox_poetry.install(session, nox_poetry.WHEEL)
nox_poetry.install(session, "pytest", "betamax")
session.run("pytest")
@nox.session(python=latest_version)
def coverage(session: Session) -> None:
"""Generate coverage report.
Args:
session: The Session object.
"""
nox_poetry.install(session, nox_poetry.WHEEL)
nox_poetry.install(session, "pytest", "betamax", "pytest-cov", "coverage[toml]")
session.run("pytest", f"--cov={package}", "tests/")
def activate_virtualenv_in_precommit_hooks(session: Session) -> None:
"""Activate virtualenv in hooks installed by pre-commit.
This function patches git hooks installed by pre-commit to activate the
session's virtual environment. This allows pre-commit to locate hooks in
that environment when invoked from git.
Args:
session: The Session object.
"""
if session.bin is None:
return
virtualenv = session.env.get("VIRTUAL_ENV")
if virtualenv is None:
return
hookdir = Path(".git") / "hooks"
if not hookdir.is_dir():
return
for hook in hookdir.iterdir():
if hook.name.endswith(".sample") or not hook.is_file():
continue
text = hook.read_text()
bindir = repr(session.bin)[1:-1] # strip quotes
if not (
Path("A") == Path("a") and bindir.lower() in text.lower() or bindir in text
):
continue
lines = text.splitlines()
if not (lines[0].startswith("#!") and "python" in lines[0].lower()):
continue
header = dedent(
f"""\
import os
os.environ["VIRTUAL_ENV"] = {virtualenv!r}
os.environ["PATH"] = os.pathsep.join((
{session.bin!r},
os.environ.get("PATH", ""),
))
"""
)
lines.insert(1, header)
hook.write_text("\n".join(lines))
@nox.session(python=latest_version)
def precommit(session: Session) -> None:
"""Lint using pre-commit.
Args:
session: The Session object.
"""
args = session.posargs or [
"run",
"--all-files",
] # "--show-diff-on-failure"]
nox_poetry.install(
session,
"black",
"darglint",
"flake8",
"flake8-bandit",
"flake8-bugbear",
"flake8-docstrings",
"flake8-rst-docstrings",
"pep8-naming",
"pre-commit",
"pre-commit-hooks",
"reorder-python-imports",
)
session.run("pre-commit", *args)
if args and args[0] == "install":
activate_virtualenv_in_precommit_hooks(session)
@nox.session(python=latest_version)
def docs(session: Session) -> None:
"""Build the documentation.
Args:
session: The Session object.
"""
output_dir = os.path.join(session.create_tmp(), "output")
doctrees, html = map(
functools.partial(os.path.join, output_dir), ["doctrees", "html"]
)
session.run("rm", "-rf", output_dir, external=True)
nox_poetry.install(session, nox_poetry.WHEEL)
nox_poetry.install(session, "sphinx", "sphinx-autobuild")
session.cd("docs")
sphinx_args = [
"-b",
"html",
"-W",
"-d",
doctrees,
".",
html,
]
if not session.interactive:
sphinx_cmd = "sphinx-build"
else:
sphinx_cmd = "sphinx-autobuild"
sphinx_args.insert(0, "--open-browser")
session.run(sphinx_cmd, *sphinx_args)

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pyproject.toml
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[tool.poetry]
name = "smbmc"
version = "0.1.0"
description = "Supermicro BMC interface"
authors = ["George Rawlinson <george@rawlinson.net.nz>"]
repository = "https://github.com/grawlinson/smbmc"
readme = "README.rst"
[tool.poetry.dependencies]
python = "^3.6.1"
requests = "^2.24.0"
defusedxml = "^0.6.0"
[tool.poetry.dev-dependencies]
pytest = "^6.1"
betamax = "^0.8.1"
pytest-cov = "^2.10.1"
coverage = {extras = ["toml"], version = "^5.3"}
pre-commit = "^2.7.1"
pre-commit-hooks = "^3.2.0"
flake8 = "^3.8.4"
black = "^20.8b1"
flake8-bandit = "^2.1.2"
flake8-bugbear = "^20.1.4"
flake8-docstrings = "^1.5.0"
flake8-rst-docstrings = "^0.0.14"
pep8-naming = "^0.11.1"
reorder-python-imports = "^2.3.5"
darglint = "^1.5.5"
sphinx = "^3.2.1"
sphinx-autobuild = "^2020.9.1"
[tool.coverage.paths]
source = ["src", "*/site-packages"]
[tool.coverage.run]
branch = true
source = ["smbmc"]
[tool.coverage.report]
fail_under = 100
show_missing = true
[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

20
src/smbmc/__init__.py
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"""The smbmc package."""
try:
from importlib.metadata import version, PackageNotFoundError
except ImportError: # pragma: no cover
from importlib_metadata import version, PackageNotFoundError
try:
__version__ = version(__name__)
except PackageNotFoundError: # pragma: no cover
__version__ = "unknown"
from .models import (
PowerSupply,
PowerSupplyFlag,
Sensor,
SensorStateEnum,
SensorTypeEnum,
SensorUnitEnum,
)
from .client import Client

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src/smbmc/client.py
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"""Provides the Client class."""
from time import time as now
from requests import Session
from .ipmi_pmbus import process_pmbus_response
from .ipmi_sensor import process_sensor_response
from .util import contains_duplicates
from .util import contains_valid_items
from .util import extract_xml_attr
KNOWN_SENSORS = ["pmbus", "sensor"]
class Client:
"""Client used to access Supermicro BMCs."""
def __init__(self, server, username, password):
"""Initialises an instance of smbmc.Client.
Args:
server: Address of server in form: 'http://192.168.1.1'.
username: Username.
password: Password.
"""
self.server = server
self.username = username
self.password = password
self._session = Session()
self.last_call = None
def login(self):
"""Login to Supermicro web interface.
Fetches a session ID (SID) cookie, which allows access to the rest
of the web interface. SID length is approximately 30 minutes,
according to the default timeout configuration.
Raises:
Exception: Authentication Error.
"""
self._session.post(
f"{self.server}/cgi/login.cgi",
data={
"name": self.username,
"pwd": self.password,
},
)
if "SID" in self._session.cookies.get_dict().keys():
self.last_call = now()
else:
raise Exception("Authentication Error")
def get_pmbus_metrics(self):
"""Acquire metrics for all power supplies.
Returns:
str: XML response.
"""
self.last_call = now()
r = self._session.post(
f"{self.server}/cgi/ipmi.cgi",
data={
"Get_PSInfoReadings.XML": "(0,0)",
},
)
psu_list = extract_xml_attr(r.text, ".//PSItem")
power_supplies = process_pmbus_response(psu_list)
return power_supplies
def get_sensor_metrics(self):
"""Acquire metrics for all sensors.
Returns:
str: XML response.
"""
self.last_call = now()
r = self._session.post(
f"{self.server}/cgi/ipmi.cgi",
data={
"SENSOR_INFO.XML": "(1,ff)",
},
)
sensor_list = extract_xml_attr(r.text, ".//SENSOR")
sensors = process_sensor_response(sensor_list)
return sensors
def get_metrics(self, metrics=["pmbus", "sensor"]): # noqa: C901
"""Fetch metrics with minimum network calls.
Args:
metrics: List of metric(s) to query.
Raises:
Exception: Argument contains duplicate metrics.
Exception: Argument contains invalid metrics.
Returns:
dict: A dict containing all metrics.
"""
if contains_duplicates(metrics):
raise Exception("metrics array contains duplicates")
if not contains_valid_items(KNOWN_SENSORS, metrics):
raise Exception("metrics array contains invalid metrics")
self.login()
result = {}
for metric in metrics:
values = None
if metric == "pmbus":
values = self.get_pmbus_metrics()
elif metric == "sensor": # pragma: no cover
values = self.get_sensor_metrics()
result.update({metric: values})
return result

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src/smbmc/ipmi_pmbus.py
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"""Provides IPMI PMBus related functions."""
from .models import PowerSupply
def process_pmbus_response(psu_list: list) -> list:
"""Obtain all power supplies.
Args:
psu_list: List of power supplies obtained from an XML response.
Returns:
list: Fully populated power supplies, complete with ID.
"""
power_supplies = []
psu_id = 0
for item in psu_list:
psu = process_pmbus_psu(item)
psu.id = psu_id
psu_id += 1
power_supplies.append(psu)
return power_supplies
def process_pmbus_psu(item: dict) -> PowerSupply:
"""Process a single power supply.
Args:
item: A single power supply obtained from an XML response.
Returns:
PowerSupply: Fully populated power supply, minus the ID.
"""
psu = PowerSupply()
psu.name = item["name"]
psu.status = item["a_b_PS_Status_I2C"]
psu.type = item["psType"]
psu.input_voltage = int(item["acInVoltage"], 16)
psu.input_current = int(item["acInCurrent"], 16) / 1000
psu.input_power = int(item["acInPower"], 16)
psu.output_voltage = int(item["dc12OutVoltage"], 16) / 10
psu.output_current = int(item["dc12OutCurrent"], 16) / 1000
psu.output_power = int(item["dcOutPower"], 16)
psu.temp_1 = int(item["temp1"], 16)
psu.temp_2 = int(item["temp2"], 16)
psu.fan_1 = int(item["fan1"], 16)
psu.fan_2 = int(item["fan2"], 16)
# for key, value in item.items():
# if "temp" in key:
# sensor = Sensor()
# sensor.name = key
# sensor.reading = int(value, 16)
# sensor.type = SensorTypeEnum.TEMPERATURE
# sensor.unit = SensorUnitEnum.DEGREES_CELSIUS
# psu.sensors.append(sensor)
# elif "fan" in key:
# sensor = Sensor()
# sensor.name = key
# sensor.reading = int(value, 16)
# sensor.type = SensorTypeEnum.FAN
# sensor.unit = SensorUnitEnum.RPM
# psu.sensors.append(sensor)
return psu

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src/smbmc/ipmi_sensor.py
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"""Provides IPMI sensor related functions."""
from enum import auto
from enum import IntEnum
from .models import PowerSupplyFlag
from .models import Sensor
from .models import SensorStateEnum
from .models import SensorTypeEnum
from .models import SensorUnitEnum
from .util import hex_signed_int
from .util import signed_int
from .util import ten_bit_str
SENSOR_READING_SCALE = 1000
class LinearisationEnum(IntEnum):
"""Enumeration of linearisation formulas."""
LINEAR = 0
LN = auto()
LOG_10 = auto()
LOG_2 = auto()
EULER = auto()
EXP_10 = auto()
EXP_2 = auto()
ONE_DIV_X = auto()
SQR = auto()
CUBE = auto()
ONE_DIV_CUBE = auto()
def reading_conversion(data: str, m: str, b: str, rb: str) -> float:
"""Performs Sensor Reading Conversion Formula.
TODO: This is the pre-linearisation formula, so look
into the spec some more.
Extracted from IPMI 2.0 specification, section 36.3.
Args:
data: Data reading.
m: Multiplier value.
b: Offset value.
rb: RB Exponent value.
Returns:
float: Pre-linearisation reading.
"""
from math import pow
# Extracted from 43.1 - SDR Type 01h, bytes 25, 27, 30.
m_raw = ten_bit_str(m)
b_raw = ten_bit_str(b)
km_raw = int(rb, 16) >> 4
kb_raw = int(rb, 16) & 0x0F
m_data = signed_int(m_raw, 10)
b_data = signed_int(b_raw, 10)
km_data = signed_int(km_raw, 4)
kb_data = signed_int(kb_raw, 4)
sensor_data = (m_data * int(data, 16) + b_data * pow(10, kb_data)) * pow(
10, km_data
)
return float(sensor_data)
def is_threshold_sensor(er_type: str) -> bool:
"""Detects whether sensor is threshold or discrete.
Extracted from the raw Event Reading Type field.
Byte 14 - Event/Reading Type Code.
Referenced from chapter 41.
Args:
er_type: Event Reading Type in raw form.
Returns:
bool: True if is a threshold sensor.
"""
return int(er_type, 16) == 1
def is_analog_data_format(unit_type_1: str) -> bool:
"""Detects whether sensor reading is in analog data format.
Args:
unit_type_1: No clue.
Returns:
bool: True if analog data format.
"""
return (int(unit_type_1, 16) >> 6) == 2
def get_sensor_state(option: str) -> SensorStateEnum:
"""Extract sensor state from OPTION byte.
... hopefully! Actually, probably a bad guess.
Args:
option: Raw OPTION byte from IPMI response.
Returns:
SensorStateEnum: State of the sensor.
"""
if int(option, 16) & 0x40:
return SensorStateEnum.PRESENT
else:
return SensorStateEnum.NOT_PRESENT
def perform_linearisation(method: str, reading: str) -> int:
"""Perform linearisation based on a method and given reading.
Args:
method: Linearisation method specified by IPMI response.
reading: Reading obtained from IPMI response.
Returns:
int: Linearised sensor reading.
Raises:
NotImplementedError: Raised when linearisation methods have
not been implemented.
"""
i_method = int(method, 16)
if i_method == LinearisationEnum.LINEAR:
return int((reading * SENSOR_READING_SCALE)) / SENSOR_READING_SCALE
else:
raise NotImplementedError
def process_threshold_sensor(item: dict) -> Sensor:
"""Process a threshold sensor.
Args:
item: Dict representing a sensor, obtained from the IPMI response.
Returns:
Sensor: Fully populated sensor.
"""
# values
values = {}
values["reading"] = item["READING"][:2]
values["unr"] = item["UNR"]
values["uc"] = item["UC"]
values["unc"] = item["UNC"]
values["lnc"] = item["LNC"]
values["lc"] = item["LC"]
values["lnr"] = item["LNR"]
# linearisation variables
multiplier = item["M"]
offset = item["B"]
rb_exponent = item["RB"]
l_method = item["L"]
# analog data conversion
if is_analog_data_format(item["UNIT1"]):
for key, value in values.items():
values[key] = hex_signed_int(value)
# perform linearisation of readings
for key, value in values.items():
values[key] = perform_linearisation(
l_method, reading_conversion(value, multiplier, offset, rb_exponent)
)
# add a sensor and we've got a stew goin'!
sensor = Sensor()
sensor.name = item["NAME"]
sensor.type = SensorTypeEnum(int(item["STYPE"], 16))
sensor.unit = SensorUnitEnum(int(item["UNIT"], 16))