def Step_By_Step_reducing_scope_with_expression():
description = "Notify me of low stock in Store 001"
subject_entity = sub.Subject_Entity(".*", "InventoryItem")
subject_expression = sub.Subject_Expression()
subject_expression.q = "shelfCount<10;refStore==urn:ngsi-ld:Store:002"
subject_condition = sub.Subject_Condition(["shelfCount"],
subject_expression)
subject = sub.Subject([subject_entity], subject_condition)
expression = sub.Subject_Expression()
http_params = sub.HTTP_Params(
"http://tutorial:3000/subscription/low-stock-store002")
notification = sub.Notification(http_params)
notification.attrsFormat = "keyValues"
subscription = sub.Subscription(subject, notification, description)
return subscription.get_json()
def API_Walkthrough_subscription():
description = "A subscription to get info about Room1"
subject_entity = sub.Subject_Entity("Room1", "Room")
subject_condition = sub.Subject_Condition(["pressure"])
subject = sub.Subject([subject_entity], subject_condition)
http_params = sub.HTTP_Params("http://localhost:1028/accumulate")
notification_attributes = sub.Notification_Attributes(
"attrs", ["temperature"])
notification = sub.Notification(http_params, notification_attributes)
expires = datetime.datetime(2040, 1, 1, 14).isoformat()
throttling = 5
subscription = sub.Subscription(subject, notification, description,
expires, throttling)
return subscription.get_json()
def check_duplicate_subscription():
description = "A second subscription for Room3"
subject_entity = sub.Subject_Entity("Room3", "Room")
subject_condition = sub.Subject_Condition(["pressure"])
subject = sub.Subject([subject_entity], subject_condition)
http_params = sub.HTTP_Params("http://localhost:1028/accumulate")
http_params.headers = {
"Content-Type": "text/plain",
"X-Auth-Token": "n5u43SunZCGX0AbnD9e8R537eDslLM"
}
http_params.method = "PUT"
http_params.qs = {"type": "${type}", "id": "${id}"}
http_params.payload = "The temperature is ${temperature} degrees"
notification = sub.Notification(http_params)
subscription = sub.Subscription(subject, notification, description)
return subscription.get_json()
def check_existing_type_subscription():
"""
Function checks whether a subscription allready exists.
:return:
"""
description = "Notify me of low stock in Store 001"
subject_entity = sub.Subject_Entity(".*", "")
subject_expression = sub.Subject_Expression()
subject_expression.q = "shelfCount<10;refStore==urn:ngsi-ld:Store:002"
subject_condition = sub.Subject_Condition(["shelfCount"],
subject_expression)
subject = sub.Subject([subject_entity], subject_condition)
expression = sub.Subject_Expression()
http_params = sub.HTTP_Params(
"http://tutorial:3000/subscription/low-stock-store002")
notification = sub.Notification(http_params)
notification.attrsFormat = "keyValues"
subscription = sub.Subscription(subject, notification, description)
return subscription.get_json()
def check_existing_id_pattern_subscription():
"""
Function checks whether a subscription already exists for an id type.
:return:
"""
description = "A subscription to get info about Room1"
subject_entity = sub.Subject_Entity("Roo*", "Room")
subject_condition = sub.Subject_Condition(["pressure"])
subject = sub.Subject([subject_entity], subject_condition)
http_params = sub.HTTP_Params("http://localhost:1028/accumulate")
notification_attributes = sub.Notification_Attributes(
"attrs", ["temperature"])
notification = sub.Notification(http_params, notification_attributes)
expires = datetime.datetime(2040, 1, 1, 14).isoformat()
print(expires)
throttling = 5
subscription = sub.Subscription(subject, notification, description,
expires, throttling)
return subscription.get_json()