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module : sdk.payment_strategies.paidcall_payment_strategy
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Entities:
Class PaidCallPaymentStrategy
extends: PaymentStrategy
is extended by: TrainingPaymentStrategy
description
The PaidCallPaymentStrategy class is a concrete implementation of the PaymentStrategy interface. This is the simplest payment strategy among those presented. In it availability of channel, funds and expiration are checked before each call and the payment itself is made each call.
attributes
block_offset(int): Block offset.call_allowance(int): The amount of allowed calls.
methods
__init__
Initializes a new instance of the class.
args:
block_offset(int): Block offset.call_allowance(int): The amount of allowed calls. Defaults to 1.
returns:
- None
get_price
Returns the price of the service call using service client.
args:
service_client(ServiceClient): The service client object.
returns:
- The price of the service call. (int)
get_payment_metadata
Creates and returns the payment metadata for a service client with the field snet-payment-type equals to escrow.
args:
service_client(ServiceClient): The service client object.
returns:
- The payment metadata. (list[tuple[str, Any]])
select_channel
Retrieves the suitable payment channel from the MPE. Opens the channel, extends expiration and adds funds id it is necessary.
args:
service_client(ServiceClient): The service client object.
returns:
- The payment channel for the service calling. (PaymentChannel)
static _has_sufficient_funds
Checks whether the payment channel has the required amount of funds.
args:
channel(PaymentChannel): The payment channel to check.amount(int): The amount of funds in cogs to check.
returns:
- True if the channel has enough funds, False otherwise. (bool)
static _is_valid
Checks if the payment channel expires later than it should.
args:
channel(PaymentChannel): The payment channel to check.expiry(int): The expiration time in blocks to check.
returns:
- True if the channel has enough expiration, False otherwise. (bool)