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display.py
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display.py
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"""
display class
Not dependent on the output type.
"""
import logging
from datetime import datetime
from PIL import Image, ImageDraw, ImageFont
from prometheus_api_client import (
MetricsList,
PrometheusApiClientException,
PrometheusConnect,
)
# pylint: disable=too-many-instance-attributes
class Display:
"""
Class to wrap fetching and drawing of the metrics.
"""
# First define some color constants
WHITE = (0xFF, 0xFF, 0xFF)
BLACK = (0x00, 0x00, 0x00)
# Next define some constants to allow easy resizing of shapes and colors
BACKGROUND_COLOR = WHITE
FOREGROUND_COLOR = WHITE
TEXT_COLOR = BLACK
# pylint: disable=too-many-arguments
def __init__(
self,
url,
display_width,
display_height,
medium_font_path,
large_font_path,
temp_sensor_name,
):
"""
:param url: URL to retrieve the metrics from
:param display_height: display width in pixels
:param display_width: display height in pixels
:param large_font_path: path to font used for large letters
:param medium_font_path: path to font used for medium letters
:param temp_sensor_name: temperature sensor name
"""
self.url = url
self.display_width = display_width
self.display_height = display_height
self.small_font = ImageFont.truetype(large_font_path, 12)
self.medium_font = ImageFont.truetype(medium_font_path, 24)
self.large_font = ImageFont.truetype(large_font_path, 64)
self.temp_sensor_name = temp_sensor_name
self.image = Image.new("RGB", (self.display_width, self.display_height))
# Get drawing object to draw on image.
self.draw = ImageDraw.Draw(self.image)
self.prometheus_connect = PrometheusConnect(url=url)
def extract_metric_from_data(self, data):
"""
Given JSON string, extract metric value and return as string
:param data:
:return:
"""
temp_list = MetricsList(data)
metric = temp_list[0]
return str(metric.metric_values.y[0])
def get_metrics(self):
"""
Retrieve metrics from given URL and return them. If a metric cannot be retrieved,
None is used instead.
:return: tuple of temperature, CO2, atmospheric pressure (as strings)
"""
temp = None
co2 = None
pressure = None
logger = logging.getLogger(__name__)
try:
temp_data = self.prometheus_connect.custom_query(
# pylint: disable=consider-using-f-string
"last_over_time(temperature{sensor='%s'}[30m])"
% self.temp_sensor_name
)
temp = self.extract_metric_from_data(temp_data)
except (PrometheusApiClientException, IndexError) as req_exc:
logger.error(f"cannot get data for temperature from {self.url}: {req_exc}")
try:
co2_data = self.prometheus_connect.get_current_metric_value(
metric_name="co2_ppm"
)
co2 = self.extract_metric_from_data(co2_data)
except (PrometheusApiClientException, IndexError) as req_exc:
logger.error(f"cannot get data for CO2 from {self.url}: {req_exc}")
try:
pressure_data = self.prometheus_connect.get_current_metric_value(
metric_name="pressure_hpa{name='sea'}"
)
pressure = self.extract_metric_from_data(pressure_data)
except (PrometheusApiClientException, IndexError) as req_exc:
logger.error(
f"cannot get data for barometric pressure from {self.url}: {req_exc}"
)
return temp, co2, pressure
def draw_image(self):
"""
Refresh the display with weather metrics retrieved from the URL
:return PIL image instance
"""
temp, co2, pressure = self.get_metrics()
# Draw a filled box as the background
self.draw.rectangle(
(0, 0, self.display_width - 1, self.display_height - 1),
fill=Display.BACKGROUND_COLOR,
)
self.draw_date_time()
text_height = self.draw_outside_temperature(temp)
current_height = self.draw_co2(co2, text_height)
self.draw_pressure(current_height, pressure)
return self.image
def draw_pressure(self, current_height, pressure):
"""
:param current_height:
:param pressure:
:return:
"""
logger = logging.getLogger(__name__)
# Display atmospheric pressure level.
if pressure:
pressure = int(float(pressure))
text = f"Pressure: {pressure} hPa"
else:
text = "Pressure: N/A"
logger.debug(text)
coordinates = (0, current_height) # use previous text height
logger.debug(f"coordinates = {coordinates}")
self.draw.text(
coordinates,
text,
font=self.medium_font,
fill=Display.TEXT_COLOR,
)
def draw_co2(self, co2, text_height):
"""
:param co2:
:param text_height:
:return: current text height
"""
logger = logging.getLogger(__name__)
# Display CO2 level.
co_text = "CO"
if co2:
co2 = int(float(co2))
text = f"{co_text} : {co2} ppm"
else:
text = f"{co_text} : N/A"
coordinates = (0, text_height + 10) # use previous text height
current_height = text_height + 10
if hasattr(self.medium_font, "getsize"):
(_, text_height) = self.medium_font.getsize(text)
else:
text_height = self.medium_font.getbbox(text)[3]
current_height = current_height + text_height
logger.debug(f"'{text}' coordinates = {coordinates}")
self.draw.text(
coordinates,
text,
font=self.medium_font,
fill=Display.TEXT_COLOR,
)
if hasattr(self.medium_font, "getsize"):
(co_width, _) = self.medium_font.getsize(co_text)
else:
co_width = self.medium_font.getbbox(co_text)[2]
coordinates = (co_width, current_height - 10)
logger.debug(f"'2' coordinates = {coordinates}")
self.draw.text(
coordinates,
"2",
font=self.small_font,
fill=Display.TEXT_COLOR,
)
return current_height
def draw_outside_temperature(self, temp):
"""
:param temp: temperature value
:return: current text height
"""
logger = logging.getLogger(__name__)
# Display outside temperature.
if temp:
outside_temp = int(float(temp))
text = f"{outside_temp}°C"
else:
text = "N/A"
logger.debug(text)
if hasattr(self.medium_font, "getsize"):
(text_width, text_height) = self.large_font.getsize(text)
else:
(text_width, text_height) = self.large_font.getbbox(text)[2:4]
logger.debug(f"text width={text_width}, height={text_height}")
logger.debug(
f"display width={self.display_width}, height={self.display_height}"
)
coordinates = (0, 0)
logger.debug(f"coordinates = {coordinates}")
self.draw.text(
coordinates,
text,
font=self.large_font,
fill=Display.TEXT_COLOR,
)
return text_height
def draw_date_time(self):
"""
Draw date and time in the top right corner.
"""
logger = logging.getLogger(__name__)
# Display time.
now = datetime.now()
text = now.strftime(f"{now.hour}:%M")
logger.debug(text)
if hasattr(self.medium_font, "getsize"):
(text_width, text_height) = self.medium_font.getsize(text)
else:
(text_width, text_height) = self.medium_font.getbbox(text)[2:4]
coordinates = (self.display_width - text_width - 10, 0)
logger.debug(f"coordinates = {coordinates}")
self.draw.text(
coordinates,
text,
font=self.medium_font,
fill=Display.TEXT_COLOR,
)
# Display date underneath the time.
text = now.strftime(f"{now.day}.{now.month}.")
logger.debug(text)
coordinates = (self.display_width - text_width - 10, text_height + 5)
logger.debug(f"coordinates = {coordinates}")
self.draw.text(
coordinates,
text,
font=self.medium_font,
fill=Display.TEXT_COLOR,
)