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#!/usr/bin/env python3
from argparse import ArgumentParser
import requests
import fscache as fs
# doco is at https://www.weather.gov/documentation/services-web-api
# openAPI spec is at https://api.weather.gov/openapi.json
base_url = 'https://api.weather.gov'
headers = {
'user-agent': 'meteor.py/0.2 (us@starfall.systems)',
'accept': 'application/ld+json'
}
# SGR decorations / ANSI escape colors
class term:
RESET = '\033[0m'
BOLD = '\033[1m'
def handle_args():
parser = ArgumentParser()
parser.add_argument('lat', help='latitude')
parser.add_argument('lon', help='longitude')
return parser.parse_args()
def print_alerts(county, zone):
# in some areas, alerts are not published for the zone but only for the county
# you can request both like this rather than making two requestsfork
alerts = requests.get(base_url + f'/alerts/active?zone={county},{zone}',
headers=headers).json()
# this title was cooler when we requested only one zone
# e.g. it would end with "for Holmes County (MSC051) MS"
# but now it's just "current watches, warnings, and advisories"
print(f'{term.BOLD}{alerts.get("title")}')
print(f'===================={term.RESET}')
for alert in alerts.get('@graph'):
print(f'{alert.get("headline")}')
print(f' {alert.get("severity")} - {alert.get("certainty")} - {alert.get("urgency")}')
print(f' Until: {alert.get("expires")}')
print(f'{alert.get("description")}')
# TODO description can be quite long
# short desc appears to be available as parameters.NWSheadline[0]
# and follow up with instruction when it exists
print('--------------------')
# many more cool fields available.
# verious datetimes: sent, effective, onset, expires, ends
# severity: Minor, Moderate, Severe, Extreme, Unknown
# certainty: Possible, Likely, Observed, Unknown
# urgency: Future, Expected, Immediate, Unknown
# messageType: Alert, Update
# can construct the headline ourseves as f'{event} issued {sent} [until {end}] by {senderName}'
print()
def print_forecast(point):
# TODO pick up gridId AFC (AER/ALU), AFG, AJK, BOX< CAE, DLH, FSD, HGX, HNX, LIX, LWX, MAF, MFR, MLB, MRX, MTR, PIH and reduce gridX and gridY by 1 - known issue
cache_key = f'{point.get("gridId")}-{point.get("gridX")},{point.get("gridY")}'
try:
print(cache.read(cache_key))
except fs.CacheMiss:
forecast_url = point.get('forecast')
forecast = requests.get(forecast_url, headers=headers).json()
# TODO retry on 500 - known issue
# TODO query param units=si
# TODO replace the whole thing with /gridpoints/{point.gridId}/{gridX},{gridY} and create our own forecast
# there is lots more information there that would be useful
# probabilityOfPrecipitation is the neatest one that's not in .../forecast or .../forecast/hourly
# but there's also relativeHumidity, apparentTemperature (and, separately, windChill), skyCover, windGust
# downside, it appears to always convert the F/mph measurements into C/kph for no reason. e.g. all temps are measured in 9ths of C
buffer = f'{term.BOLD}forecast for {point.get("relativeLocation").get("city")}, {point.get("relativeLocation").get("state")} ({cache_key})'
buffer += '\n' + f'===================={term.RESET}'
periods = forecast.get('periods')
# print today and tonight in long format
for period in periods[:2]:
buffer += '\n' + f'{term.BOLD}{period.get("name")}{term.RESET}:'
buffer += '\n' + f' {period.get("temperature")}°{period.get("temperatureUnit")}, wind {period.get("windSpeed")} {period.get("windDirection")}'
buffer += '\n' + f' {period.get("detailedForecast")}'
# print further forecasted periods in short format
for period in periods[2:]:
# TODO parse isDaytime true/false to squish a day together
buffer += '\n' + f'{term.BOLD}{period.get("name").ljust(15)}{term.RESET}: {period.get("shortForecast")} - {period.get("temperature")}°{period.get("temperatureUnit")}, {period.get("windSpeed")} {period.get("windDirection")}'
cache.write(cache_key, buffer)
print(buffer)
def main():
args = handle_args()
global cache
cache = fs.Cache('meteor.py')
point = requests.get(base_url + f'/points/{args.lat},{args.lon}',
headers=headers).json()
county = point.get('county').split('/')[-1]
zone = point.get('forecastZone').split('/')[-1]
print_alerts(county, zone)
# TODO can hazardous weather outlook be gotten programatically?
print_forecast(point)
if __name__ == '__main__':
import sys
sys.exit(main())
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