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973cc2c4c9
Also expect the date being passed in is BST. The date is converted to UTC before saving. And converted to BST when returning a notification.
80 lines
2.8 KiB
Python
80 lines
2.8 KiB
Python
from datetime import datetime, timedelta
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import pytz
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from flask import url_for
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from sqlalchemy import func
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from notifications_utils.template import SMSMessageTemplate, PlainTextEmailTemplate, LetterPreviewTemplate
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local_timezone = pytz.timezone("Europe/London")
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def pagination_links(pagination, endpoint, **kwargs):
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if 'page' in kwargs:
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kwargs.pop('page', None)
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links = {}
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if pagination.has_prev:
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links['prev'] = url_for(endpoint, page=pagination.prev_num, **kwargs)
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if pagination.has_next:
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links['next'] = url_for(endpoint, page=pagination.next_num, **kwargs)
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links['last'] = url_for(endpoint, page=pagination.pages, **kwargs)
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return links
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def url_with_token(data, url, config):
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from notifications_utils.url_safe_token import generate_token
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token = generate_token(data, config['SECRET_KEY'], config['DANGEROUS_SALT'])
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base_url = config['ADMIN_BASE_URL'] + url
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return base_url + token
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def get_template_instance(template, values):
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from app.models import SMS_TYPE, EMAIL_TYPE, LETTER_TYPE
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return {
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SMS_TYPE: SMSMessageTemplate, EMAIL_TYPE: PlainTextEmailTemplate, LETTER_TYPE: LetterPreviewTemplate
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}[template['template_type']](template, values)
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def get_london_midnight_in_utc(date):
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"""
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This function converts date to midnight as BST (British Standard Time) to UTC,
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the tzinfo is lastly removed from the datetime because the database stores the timestamps without timezone.
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:param date: the day to calculate the London midnight in UTC for
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:return: the datetime of London midnight in UTC, for example 2016-06-17 = 2016-06-17 23:00:00
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"""
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return local_timezone.localize(datetime.combine(date, datetime.min.time())).astimezone(
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pytz.UTC).replace(
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tzinfo=None)
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def get_midnight_for_day_before(date):
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day_before = date - timedelta(1)
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return get_london_midnight_in_utc(day_before)
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def convert_utc_time_in_bst(utc_dt):
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return pytz.utc.localize(utc_dt).astimezone(local_timezone).replace(tzinfo=None)
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def convert_bst_to_utc(date):
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return local_timezone.localize(date).astimezone(pytz.UTC).replace(tzinfo=None)
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def get_london_month_from_utc_column(column):
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"""
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Where queries need to count notifications by month it needs to be
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the month in BST (British Summer Time).
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The database stores all timestamps as UTC without the timezone.
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- First set the timezone on created_at to UTC
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- then convert the timezone to BST (or Europe/London)
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- lastly truncate the datetime to month with which we can group
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queries
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"""
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return func.date_trunc(
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"month",
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func.timezone("Europe/London", func.timezone("UTC", column))
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)
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def cache_key_for_service_template_counter(service_id, limit_days=7):
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return "{}-template-counter-limit-{}-days".format(service_id, limit_days)
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