class City(db.Model): # type: ignore
__tablename__ = "cities"
id = db.Column(db.Integer(), nullable=False, primary_key=True)
name = db.Column(db.String(), nullable=False)
state_code = db.Column(db.String(2), nullable=False)
zipcodes = db.relationship("Zipcode")
__table_args__ = (db.Index(
"_name_state_code_index",
"name",
"state_code",
unique=True,
), )
class User(UserMixin, db.Model): # type: ignore
__tablename__ = "users"
id = db.Column(db.Integer(), primary_key=True)
email = db.Column(db.String(120), index=True, unique=True, nullable=False)
password_hash = db.Column(db.String(128), nullable=False)
is_admin = db.Column(db.Boolean(), default=False)
def __repr__(self):
return f"<User {self.email}>"
def set_password(self, password: str):
self.password_hash = generate_password_hash(password)
def check_password(self, password: str) -> bool:
return check_password_hash(self.password_hash, password)
@property
def can_send_sms(self) -> bool:
return self.email == "*****@*****.**"
class Client(db.Model): # type: ignore
__tablename__ = "clients"
query_class = ClientQuery
id = db.Column(db.Integer(), primary_key=True)
identifier = db.Column(db.String(), nullable=False)
type_code = db.Column(db.Enum(ClientIdentifierType), nullable=False)
created_at = db.Column(db.TIMESTAMP(timezone=True),
default=now,
index=True,
nullable=False)
last_activity_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
zipcode_id = db.Column(
db.Integer(),
db.ForeignKey("zipcodes.id", name="clients_zipcode_id_fkey"),
nullable=True,
)
last_pm25 = db.Column(db.Float(), nullable=True)
last_humidity = db.Column(db.Float(), nullable=True)
last_pm_cf_1 = db.Column(db.Float(), nullable=True)
last_alert_sent_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
alerts_disabled_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
num_alerts_sent = db.Column(db.Integer(),
nullable=False,
server_default="0")
locale = db.Column(db.String(), nullable=False, server_default="en")
preferences = db.Column(db.JSON(), nullable=True)
zipcode = db.relationship("Zipcode")
events = db.relationship("Event")
__table_args__ = (db.Index(
"_client_identifier_type_code",
"identifier",
"type_code",
unique=True,
), )
def __repr__(self) -> str:
return f"<Client {self.identifier}>"
# Send alerts between 8 AM and 9 PM.
SEND_WINDOW_HOURS = (8, 21)
# Time after which the client shouldn't treat an event as "recent"
# and therefore shouldn't include it in its state
EVENT_RESPONSE_TIME = datetime.timedelta(hours=1)
@classmethod
def get_share_window(self) -> typing.Tuple[int, int]:
ts = timestamp()
share_window_start = ts - 60 * 15
share_window_end = ts - 60 * 5
return share_window_start, share_window_end
@classmethod
def get_share_request_cutoff(self) -> datetime.datetime:
return now() - datetime.timedelta(days=60)
#
# Presence
#
def mark_seen(self, locale: str):
self.last_activity_at = timestamp()
if self.locale != locale:
self.locale = locale
db.session.commit()
#
# Prefs
#
alert_frequency = IntegerPreference(
display_name=lazy_gettext("Alert Frequency"),
description=lazy_gettext(
"By default, Hazebot sends alerts at most every 2 hours."),
default=2,
min_value=0,
max_value=24,
)
alert_threshold: IntegerChoicesPreference[Pm25] = IntegerChoicesPreference(
display_name=lazy_gettext("Alert Threshold"),
description=lazy_gettext(
"AQI category below which Hazebot won't send alerts.\n"
"For example, if you set this to MODERATE, "
"Hazebot won't send alerts when AQI transitions from GOOD to MODERATE or from MODERATE to GOOD."
),
default=Pm25.MODERATE,
choices=Pm25,
)
conversion_factor: StringChoicesPreference[
ConversionFactor] = StringChoicesPreference(
display_name=lazy_gettext("Conversion Factor"),
description=lazy_gettext(
"Conversion factor to use when calculating AQI. "
"For more details, see https://www2.purpleair.com/community/faq#hc-should-i-use-the-conversion-factors-on-the-purpleair-map-1."
),
default=ConversionFactor.NONE,
choices=ConversionFactor,
)
#
# AQI
#
def get_last_readings(self) -> Readings:
return Readings(pm25=self.last_pm25,
pm_cf_1=self.last_pm_cf_1,
humidity=self.last_humidity)
def get_current_aqi(self) -> int:
"""Current AQI for this client."""
return self.zipcode.get_aqi(self.conversion_factor)
def get_current_pm25(self) -> float:
"""Current Pm25 for this client as determined by its chosen strategy."""
return self.zipcode.get_pm25(self.conversion_factor)
def get_current_pm25_level(self) -> Pm25:
"""Current Pm25 level for this client as determined by its chosen strategy."""
return self.zipcode.get_pm25_level(self.conversion_factor)
def get_last_aqi(self) -> int:
"""Last AQI at which an alert was sent to this client."""
return self.get_last_readings().get_aqi(self.conversion_factor)
def get_last_pm25(self) -> float:
"""Last Pm25 for this client as determined by its chosen strategy."""
return self.get_last_readings().get_pm25(self.conversion_factor)
def get_last_pm25_level(self) -> Pm25:
"""Last Pm25 level for this client as determined by its chosen strategy."""
return self.get_last_readings().get_pm25_level(self.conversion_factor)
def get_recommendations(self, num_desired: int) -> typing.List[Zipcode]:
"""Recommended zipcodes for this client."""
return self.zipcode.get_recommendations(num_desired,
self.conversion_factor)
#
# Alerting
#
@property
def is_enabled_for_alerts(self) -> bool:
return bool(self.zipcode_id and not self.alerts_disabled_at)
def update_subscription(self, zipcode: Zipcode) -> bool:
self.last_pm25 = zipcode.pm25
self.last_humidity = zipcode.humidity
self.last_pm_cf_1 = zipcode.pm_cf_1
curr_zipcode_id = self.zipcode_id
self.zipcode_id = zipcode.id
db.session.commit()
return curr_zipcode_id != self.zipcode_id
def disable_alerts(self, is_automatic=False):
if self.alerts_disabled_at == 0:
self.alerts_disabled_at = timestamp()
db.session.commit()
self.log_event(
EventType.UNSUBSCRIBE_AUTO
if is_automatic else EventType.UNSUBSCRIBE,
zipcode=self.zipcode.zipcode,
)
def enable_alerts(self):
if self.alerts_disabled_at > 0:
self.last_pm25 = self.zipcode.pm25
self.last_humidity = self.zipcode.humidity
self.last_pm_cf_1 = self.zipcode.pm_cf_1
self.alerts_disabled_at = 0
db.session.commit()
self.log_event(EventType.RESUBSCRIBE, zipcode=self.zipcode.zipcode)
@property
def is_in_send_window(self) -> bool:
if self.zipcode_id is None:
return False
# Timezone can be null since our data is incomplete.
timezone = self.zipcode.timezone or "America/Los_Angeles"
dt = now(timezone=timezone)
send_start, send_end = self.SEND_WINDOW_HOURS
return send_start <= dt.hour < send_end
def send_message(self,
message: str,
media: typing.Optional[str] = None) -> bool:
if self.type_code == ClientIdentifierType.PHONE_NUMBER:
try:
send_sms(message, self.identifier, self.locale, media=media)
except TwilioRestException as e:
code = TwilioErrorCode.from_exc(e)
if code:
logger.warning(
"Disabling alerts for recipient %s: %s",
self,
code.name,
)
self.disable_alerts(is_automatic=True)
return False
else:
raise
else:
# Other clients types don't yet support message sending.
logger.info("Not messaging client %s: %s", self.id, message)
return True
def maybe_notify(self) -> bool:
if not self.is_in_send_window:
return False
alert_frequency = self.alert_frequency * 60 * 60
if self.last_alert_sent_at >= timestamp() - alert_frequency:
return False
curr_pm25 = self.get_current_pm25()
curr_aqi_level = self.get_current_pm25_level()
curr_aqi = self.get_current_aqi()
# Only send if the pm25 changed a level since the last time we sent this alert.
last_aqi_level = self.get_last_pm25_level()
if curr_aqi_level == last_aqi_level:
return False
alert_threshold = self.alert_threshold
# If the current AQI is below the alert threshold, and the last AQI was
# at the alerting threshold or below, we won't send the alert.
# For example, if the user sets their threshold at UNHEALTHY, they won't
# be notified when the AQI transitions from UNHEALTHY to UNHEALHY FOR SENSITIVE GROUPS
# or from UNHEALTHY to MODERATE, but will be notified if the AQI transitions from
# VERY UNHEALTHY to UNHEALTHY.
if curr_aqi_level < alert_threshold and last_aqi_level <= alert_threshold:
return False
# If the current AQI is at the alert threshold but the last AQI was under it,
# don't send the alert because we haven't crossed the threshold yet.
if curr_aqi_level == alert_threshold and last_aqi_level < alert_threshold:
return False
# Do not alert clients who received an alert recently unless AQI has changed markedly.
was_alerted_recently = self.last_alert_sent_at > timestamp() - (60 *
60 * 6)
last_aqi = self.get_last_aqi()
if was_alerted_recently and abs(curr_aqi - last_aqi) < 50:
return False
message = gettext(
'AQI is now %(curr_aqi)s in zipcode %(zipcode)s (level: %(curr_aqi_level)s).\n\nReply "M" for Menu or "E" to end alerts.',
zipcode=self.zipcode.zipcode,
curr_aqi_level=curr_aqi_level.display,
curr_aqi=curr_aqi,
)
if not self.send_message(message):
return False
self.last_alert_sent_at = timestamp()
self.last_pm25 = self.zipcode.pm25
self.last_pm_cf_1 = self.zipcode.pm_cf_1
self.last_humidity = self.zipcode.humidity
self.num_alerts_sent += 1
db.session.commit()
self.log_event(EventType.ALERT,
zipcode=self.zipcode.zipcode,
pm25=curr_pm25)
return True
def request_share(self) -> bool:
if not self.is_in_send_window:
return False
if self.created_at >= now() - datetime.timedelta(days=7):
return False
# Double check that we're all good to go
share_window_start, share_window_end = self.get_share_window()
if (not self.last_alert_sent_at
or self.last_alert_sent_at <= share_window_start
or self.last_alert_sent_at >= share_window_end):
return False
# Check the last share request we sent was a long time ago
share_request = self.get_last_share_request()
if share_request and share_request.timestamp >= self.get_share_request_cutoff(
):
return False
message = gettext(
"Has Hazebot been helpful? We’re looking for ways to grow and improve, and we’d love your help. Save our contact and share Hazebot with a friend, or text “feedback” to send feedback."
)
if not self.send_message(message):
return False
Event.query.create(self.id, EventType.SHARE_REQUEST)
return True
#
# Events
#
def log_event(self, event_type: EventType,
**event_data: typing.Any) -> Event:
return Event.query.create(self.id, event_type, **event_data)
def _get_last_event_by_type(
self, event_type: EventType) -> typing.Optional[Event]:
return (Event.query.filter(Event.client_id == self.id).filter(
Event.type_code == event_type).order_by(
Event.timestamp.desc()).first())
def get_last_alert(self) -> typing.Optional[Event]:
return self._get_last_event_by_type(EventType.ALERT)
def get_last_share_request(self) -> typing.Optional[Event]:
return self._get_last_event_by_type(EventType.SHARE_REQUEST)
def get_last_client_event(self) -> typing.Optional[Event]:
return (Event.query.filter(Event.client_id == self.id).filter(
~Event.type_code.in_([EventType.ALERT, EventType.SHARE_REQUEST
])) # filter for only inbound events
.order_by(Event.timestamp.desc()).first())
def get_last_client_event_type(self) -> typing.Optional[EventType]:
last_event = self.get_last_client_event()
if last_event:
return EventType(last_event.type_code)
return None
def should_accept_feedback(self) -> bool:
# First check if the most recent event is a feedback begin or unsub event
if self.has_recent_last_events_of_type({
EventType.FEEDBACK_BEGIN,
EventType.UNSUBSCRIBE,
}):
return True
# Then check if we have an outstanding feedback request
cutoff = now() - datetime.timedelta(days=4)
feedback_request_event = self.get_event_of_type_after(
EventType.FEEDBACK_REQUEST, cutoff)
# Check whether feedback was responded to
if feedback_request_event and not self.get_event_of_type_after(
EventType.FEEDBACK_RECEIVED, feedback_request_event.timestamp):
return True
return False
def get_event_of_type_after(
self, event_type: EventType,
cutoff: datetime.datetime) -> typing.Optional[Event]:
return (Event.query.filter(Event.client_id == self.id).filter(
Event.timestamp > cutoff).filter(
Event.type_code == event_type).first())
def has_recent_last_events_of_type(
self, event_types: typing.Set[EventType]) -> bool:
return any(self.has_recent_last_event_of_type(e) for e in event_types)
def has_recent_last_event_of_type(self, event_type: EventType) -> bool:
last_event = self.get_last_client_event()
return bool(
last_event and last_event.type_code == event_type
and now() - last_event.timestamp < Client.EVENT_RESPONSE_TIME)
class Zipcode(db.Model): # type: ignore
__tablename__ = "zipcodes"
query_class = ZipcodeQuery
id = db.Column(db.Integer(), nullable=False, primary_key=True)
zipcode = db.Column(db.String(), nullable=False, unique=True, index=True)
city_id = db.Column(db.Integer(),
db.ForeignKey("cities.id"),
nullable=False)
latitude = db.Column(db.Float(asdecimal=True), nullable=False)
longitude = db.Column(db.Float(asdecimal=True), nullable=False)
timezone = db.Column(db.String(), nullable=True)
geohash_bit_1 = db.Column(db.String(), nullable=False)
geohash_bit_2 = db.Column(db.String(), nullable=False)
geohash_bit_3 = db.Column(db.String(), nullable=False)
geohash_bit_4 = db.Column(db.String(), nullable=False)
geohash_bit_5 = db.Column(db.String(), nullable=False)
geohash_bit_6 = db.Column(db.String(), nullable=False)
geohash_bit_7 = db.Column(db.String(), nullable=False)
geohash_bit_8 = db.Column(db.String(), nullable=False)
geohash_bit_9 = db.Column(db.String(), nullable=False)
geohash_bit_10 = db.Column(db.String(), nullable=False)
geohash_bit_11 = db.Column(db.String(), nullable=False)
geohash_bit_12 = db.Column(db.String(), nullable=False)
coordinates = db.Column(Geometry("POINT"), nullable=True)
pm25 = db.Column(db.Float(),
nullable=False,
index=True,
server_default="0")
humidity = db.Column(db.Float(), nullable=False, server_default="0")
pm_cf_1 = db.Column(db.Float(), nullable=False, server_default="0")
pm25_updated_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
metrics_data = db.Column(db.JSON(), nullable=True)
city = db.relationship("City")
def __repr__(self) -> str:
return f"<Zipcode {self.zipcode}>"
def __new__(cls, *args, **kwargs):
obj = super().__new__(cls)
obj._distance_cache = {}
return obj
def get_metrics(self) -> ZipcodeMetrics:
if not hasattr(self, "_metrics"):
self._metrics = ZipcodeMetrics(
num_sensors=self.metrics_data["num_sensors"],
max_sensor_distance=self.metrics_data["max_sensor_distance"],
min_sensor_distance=self.metrics_data["min_sensor_distance"],
sensor_ids=self.metrics_data["sensor_ids"],
)
return self._metrics
def get_readings(self) -> Readings:
return Readings(pm25=self.pm25,
pm_cf_1=self.pm_cf_1,
humidity=self.humidity)
@property
def num_sensors(self) -> int:
return self.get_metrics().num_sensors
@property
def max_sensor_distance(self) -> int:
return self.get_metrics().max_sensor_distance
@property
def min_sensor_distance(self) -> int:
return self.get_metrics().min_sensor_distance
@property
def geohash(self) -> str:
"""This zipcode's geohash."""
return "".join(
[getattr(self, f"geohash_bit_{i}") for i in range(1, 13)])
@classmethod
def pm25_stale_cutoff(cls) -> float:
"""Timestamp before which pm25 measurements are considered stale."""
return timestamp() - (60 * 60)
@property
def is_pm25_stale(self) -> bool:
"""Whether this zipcode's pm25 measurements are considered stale."""
return self.pm25_updated_at < self.pm25_stale_cutoff()
def distance(self, other: "Zipcode") -> float:
"""Distance between this zip and the given zip."""
if other.id in self._distance_cache:
return self._distance_cache[other.id]
if self.id in other._distance_cache:
return other._distance_cache[self.id]
self._distance_cache[other.id] = haversine_distance(
other.longitude,
other.latitude,
self.longitude,
self.latitude,
)
return self._distance_cache[other.id]
def get_aqi(self, conversion_factor: ConversionFactor) -> int:
"""The AQI for this zipcode (e.g., 35) as determined by the provided strategy."""
return self.get_readings().get_aqi(conversion_factor)
def get_pm25(self, conversion_factor: ConversionFactor) -> float:
"""Current pm25 for this client, as determined by the provided strategy."""
return self.get_readings().get_pm25(conversion_factor)
def get_pm25_level(self, conversion_factor: ConversionFactor) -> Pm25:
"""The pm25 category for this zipcode (e.g., Moderate)."""
return self.get_readings().get_pm25_level(conversion_factor)
def get_recommendations(
self, num_desired: int,
conversion_factor: ConversionFactor) -> typing.List["Zipcode"]:
"""Get n recommended zipcodes near this zipcode, sorted by distance."""
if self.is_pm25_stale:
return []
cutoff = self.pm25_stale_cutoff()
# TODO: Make this faster somehow?
curr_pm25_level = self.get_pm25_level(conversion_factor)
zipcodes = [
z for z in Zipcode.query.filter(
Zipcode.pm25_updated_at > cutoff).order_by_distance(self)
if z.get_pm25_level(conversion_factor) < curr_pm25_level
]
return zipcodes[:num_desired]
class Sensor(db.Model): # type: ignore
__tablename__ = "sensors"
id = db.Column(db.Integer(), nullable=False, primary_key=True)
latest_reading = db.Column(db.Float(), nullable=False)
updated_at = db.Column(db.Integer(), nullable=False)
latitude = db.Column(db.Float(), nullable=False)
longitude = db.Column(db.Float(), nullable=False)
geohash_bit_1 = db.Column(db.String(), nullable=False)
geohash_bit_2 = db.Column(db.String(), nullable=False)
geohash_bit_3 = db.Column(db.String(), nullable=False)
geohash_bit_4 = db.Column(db.String(), nullable=False)
geohash_bit_5 = db.Column(db.String(), nullable=False)
geohash_bit_6 = db.Column(db.String(), nullable=False)
geohash_bit_7 = db.Column(db.String(), nullable=False)
geohash_bit_8 = db.Column(db.String(), nullable=False)
geohash_bit_9 = db.Column(db.String(), nullable=False)
geohash_bit_10 = db.Column(db.String(), nullable=False)
geohash_bit_11 = db.Column(db.String(), nullable=False)
geohash_bit_12 = db.Column(db.String(), nullable=False)
def __repr__(self) -> str:
return f"<Sensor {self.id}: {self.latest_reading}>"
@property
def geohash(self) -> str:
return "".join(
[getattr(self, f"geohash_bit_{i}") for i in range(1, 13)])
class Client(db.Model): # type: ignore
__tablename__ = "clients"
query_class = ClientQuery
id = db.Column(db.Integer(), primary_key=True)
identifier = db.Column(db.String(), nullable=False)
type_code = db.Column(db.Enum(ClientIdentifierType), nullable=False)
created_at = db.Column(db.TIMESTAMP(timezone=True),
default=now,
index=True,
nullable=False)
last_activity_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
zipcode_id = db.Column(
db.Integer(),
db.ForeignKey("zipcodes.id", name="clients_zipcode_id_fkey"),
nullable=True,
)
last_pm25 = db.Column(db.Float(), nullable=True)
last_alert_sent_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
alerts_disabled_at = db.Column(db.Integer(),
nullable=False,
index=True,
server_default="0")
num_alerts_sent = db.Column(db.Integer(),
nullable=False,
server_default="0")
requests = db.relationship("Request")
zipcode = db.relationship("Zipcode")
events = db.relationship("Event")
__table_args__ = (db.Index(
"_client_identifier_type_code",
"identifier",
"type_code",
unique=True,
), )
def __repr__(self) -> str:
return f"<Client {self.identifier}>"
# Send alerts at most every TWO hours to avoid spamming people.
# One hour seems like a reasonable frequency because AQI
# doesn't fluctuate very frequently. We should look at implementing
# logic to smooth out this alerting so that if AQI oscillates
# between two levels we don't spam the user every TWO hour.
# TODO: update logic with hysteresis to avoid spamming + save money
FREQUENCY = 2 * 60 * 60
# Send alerts between 8 AM and 9 PM.
SEND_WINDOW_HOURS = (8, 21)
# Time alotted between feedback command and feedback response.
FEEDBACK_RESPONSE_TIME = datetime.timedelta(hours=1)
@classmethod
def get_share_window(self) -> typing.Tuple[int, int]:
ts = timestamp()
share_window_start = ts - 60 * 15
share_window_end = ts - 60 * 5
return share_window_start, share_window_end
@classmethod
def get_share_request_cutoff(self) -> datetime.datetime:
return now() - datetime.timedelta(days=60)
#
# Presence
#
def log_request(self, zipcode: Zipcode):
request = Request.query.filter_by(
client_id=self.id,
zipcode_id=zipcode.id,
).first()
now = timestamp()
if request is None:
request = Request(
client_id=self.id,
zipcode_id=zipcode.id,
count=1,
first_ts=now,
last_ts=now,
)
db.session.add(request)
else:
request.count += 1
request.last_ts = now
db.session.commit()
def mark_seen(self):
self.last_activity_at = timestamp()
db.session.commit()
#
# AQI
#
@property
def last_aqi(self) -> typing.Optional[int]:
return pm25_to_aqi(self.last_pm25)
#
# Alerting
#
@property
def is_enabled_for_alerts(self) -> bool:
return bool(self.zipcode_id and not self.alerts_disabled_at)
def update_subscription(self, zipcode: Zipcode) -> bool:
self.last_pm25 = zipcode.pm25
curr_zipcode_id = self.zipcode_id
self.zipcode_id = zipcode.id
db.session.commit()
return curr_zipcode_id != self.zipcode_id
def disable_alerts(self, is_automatic=False):
if self.alerts_disabled_at == 0:
self.alerts_disabled_at = timestamp()
db.session.commit()
self.log_event(
EventType.UNSUBSCRIBE_AUTO
if is_automatic else EventType.UNSUBSCRIBE,
zipcode=self.zipcode.zipcode,
)
def enable_alerts(self):
if self.alerts_disabled_at > 0:
self.last_pm25 = self.zipcode.pm25
self.alerts_disabled_at = 0
db.session.commit()
self.log_event(EventType.RESUBSCRIBE, zipcode=self.zipcode.zipcode)
@property
def is_in_send_window(self) -> bool:
if self.zipcode_id is None:
return False
# Timezone can be null since our data is incomplete.
timezone = self.zipcode.timezone or "America/Los_Angeles"
dt = now(timezone=timezone)
send_start, send_end = self.SEND_WINDOW_HOURS
return send_start <= dt.hour < send_end
def send_message(self, message: str) -> bool:
if self.type_code == ClientIdentifierType.PHONE_NUMBER:
try:
send_sms(message, self.identifier)
except TwilioRestException as e:
code = TwilioErrorCode.from_exc(e)
if code:
logger.warning(
"Disabling alerts for recipient %s: %s",
self,
code.name,
)
self.disable_alerts(is_automatic=True)
return False
else:
raise
else:
# Other clients types don't yet support message sending.
logger.info("Not messaging client %s: %s", self.id, message)
return True
def maybe_notify(self) -> bool:
if not self.is_in_send_window:
return False
if self.last_alert_sent_at >= timestamp() - self.FREQUENCY:
return False
curr_pm25 = self.zipcode.pm25
curr_aqi_level = Pm25.from_measurement(curr_pm25)
curr_aqi = pm25_to_aqi(curr_pm25)
# Only send if the pm25 changed a level since the last time we sent this alert.
last_aqi_level = Pm25.from_measurement(self.last_pm25)
if curr_aqi_level == last_aqi_level:
return False
# Do not alert clients who received an alert recently unless AQI has changed markedly.
was_alerted_recently = self.last_alert_sent_at > timestamp() - (60 *
60 * 6)
last_aqi = self.last_aqi
if (was_alerted_recently and last_aqi and curr_aqi
and abs(curr_aqi - last_aqi) < 20):
return False
message = (
"Air quality in {city} {zipcode} has changed to {curr_aqi_level} (AQI {curr_aqi}).\n"
"\n"
'Reply "M" for Menu or "E" to end alerts.').format(
city=self.zipcode.city.name,
zipcode=self.zipcode.zipcode,
curr_aqi_level=curr_aqi_level.display,
curr_aqi=curr_aqi,
)
if not self.send_message(message):
return False
self.last_alert_sent_at = timestamp()
self.last_pm25 = curr_pm25
self.num_alerts_sent += 1
db.session.commit()
self.log_event(EventType.ALERT,
zipcode=self.zipcode.zipcode,
pm25=curr_pm25)
return True
def request_share(self) -> bool:
if not self.is_in_send_window:
return False
if self.created_at >= now() - datetime.timedelta(days=7):
return False
# Double check that we're all good to go
share_window_start, share_window_end = self.get_share_window()
if (not self.last_alert_sent_at
or self.last_alert_sent_at <= share_window_start
or self.last_alert_sent_at >= share_window_end):
return False
# Check the last share request we sent was a long time ago
share_request = self.get_last_share_request()
if share_request and share_request.timestamp >= self.get_share_request_cutoff(
):
return False
message = (
"Has Hazebot been helpful? "
"We’re looking for ways to grow and improve, and we’d love your help. "
"Save our contact and share Hazebot with a friend, or text “feedback” to send feedback."
)
if not self.send_message(message):
return False
Event.query.create(self.id, EventType.SHARE_REQUEST)
return True
#
# Events
#
def log_event(self, event_type: EventType,
**event_data: typing.Any) -> Event:
return Event.query.create(self.id, event_type, **event_data)
def _get_last_event_by_type(
self, event_type: EventType) -> typing.Optional[Event]:
return (Event.query.filter(Event.client_id == self.id).filter(
Event.type_code == event_type).order_by(
Event.timestamp.desc()).first())
def get_last_alert(self) -> typing.Optional[Event]:
return self._get_last_event_by_type(EventType.ALERT)
def get_last_share_request(self) -> typing.Optional[Event]:
return self._get_last_event_by_type(EventType.SHARE_REQUEST)
def get_last_client_event(self) -> typing.Optional[Event]:
return (Event.query.filter(Event.client_id == self.id).filter(
~Event.type_code.in_([EventType.ALERT, EventType.SHARE_REQUEST
])) # filter for only inbound events
.order_by(Event.timestamp.desc()).first())
def get_last_client_event_type(self) -> typing.Optional[EventType]:
last_event = self.get_last_client_event()
if last_event:
return EventType(last_event.type_code)
return None
def should_accept_feedback(self) -> bool:
last_event = self.get_last_client_event()
return bool(
last_event and last_event.type_code
in (EventType.FEEDBACK_BEGIN, EventType.UNSUBSCRIBE)
and now() - last_event.timestamp < Client.FEEDBACK_RESPONSE_TIME)
class Zipcode(db.Model): # type: ignore
__tablename__ = "zipcodes"
query_class = ZipcodeQuery
id = db.Column(db.Integer(), nullable=False, primary_key=True)
zipcode = db.Column(db.String(), nullable=False, unique=True, index=True)
city_id = db.Column(db.Integer(), db.ForeignKey("cities.id"), nullable=False)
latitude = db.Column(db.Float(asdecimal=True), nullable=False)
longitude = db.Column(db.Float(asdecimal=True), nullable=False)
timezone = db.Column(db.String(), nullable=True)
geohash_bit_1 = db.Column(db.String(), nullable=False)
geohash_bit_2 = db.Column(db.String(), nullable=False)
geohash_bit_3 = db.Column(db.String(), nullable=False)
geohash_bit_4 = db.Column(db.String(), nullable=False)
geohash_bit_5 = db.Column(db.String(), nullable=False)
geohash_bit_6 = db.Column(db.String(), nullable=False)
geohash_bit_7 = db.Column(db.String(), nullable=False)
geohash_bit_8 = db.Column(db.String(), nullable=False)
geohash_bit_9 = db.Column(db.String(), nullable=False)
geohash_bit_10 = db.Column(db.String(), nullable=False)
geohash_bit_11 = db.Column(db.String(), nullable=False)
geohash_bit_12 = db.Column(db.String(), nullable=False)
pm25 = db.Column(db.Float(), nullable=False, index=True, server_default="0")
pm25_updated_at = db.Column(
db.Integer(), nullable=False, index=True, server_default="0"
)
num_sensors = db.Column(db.Integer(), nullable=False, server_default="0")
min_sensor_distance = db.Column(db.Float(), nullable=False, server_default="0")
max_sensor_distance = db.Column(db.Float(), nullable=False, server_default="0")
city = db.relationship("City")
requests = db.relationship("Request")
def __repr__(self) -> str:
return f"<Zipcode {self.zipcode}>"
def __new__(cls, *args, **kwargs):
obj = super().__new__(cls)
obj._distance_cache = {}
return obj
@property
def geohash(self) -> str:
"""This zipcode's geohash."""
return "".join([getattr(self, f"geohash_bit_{i}") for i in range(1, 13)])
@property
def aqi(self) -> typing.Optional[int]:
"""The AQI for this zipcode (e.g., 35)."""
return pm25_to_aqi(self.pm25)
@property
def pm25_level(self) -> Pm25:
"""The pm25 category for this zipcode (e.g., Moderate)."""
return Pm25.from_measurement(self.pm25)
@classmethod
def pm25_stale_cutoff(cls) -> float:
"""Timestamp before which pm25 measurements are considered stale."""
return timestamp() - (60 * 30)
@property
def is_pm25_stale(self) -> bool:
"""Whether this zipcode's pm25 measurements are considered stale."""
return self.pm25_updated_at < self.pm25_stale_cutoff()
def distance(self, other: "Zipcode") -> float:
"""Distance between this zip and the given zip."""
if other.id in self._distance_cache:
return self._distance_cache[other.id]
if self.id in other._distance_cache:
return other._distance_cache[self.id]
self._distance_cache[other.id] = haversine_distance(
other.longitude,
other.latitude,
self.longitude,
self.latitude,
)
return self._distance_cache[other.id]
def get_recommendations(self, num_desired: int) -> typing.List["Zipcode"]:
"""Get n recommended zipcodes near this zipcode, sorted by distance."""
if not self.pm25_level or self.is_pm25_stale:
return []
cutoff = self.pm25_stale_cutoff()
zipcodes = (
Zipcode.query.filter(Zipcode.pm25_updated_at > cutoff)
.filter(Zipcode.pm25 < self.pm25_level)
.all()
)
# Sorting 40000 zipcodes in memory is surprisingly fast.
#
# I wouldn't be surprised if doing this huge fetch every time actually leads to better
# performance since Postgres can easily cache the whole query.
#
return sorted(zipcodes, key=lambda z: self.distance(z))[:num_desired]