Implement websubhub:ServiceConfig annotation for websubhub:Service

[ayeshLK]

Description:

Implement websubhub:ServiceConfig annotation which could be used to provide additional configurations for websubhub:Service.

Describe your problem(s)

Developers should be able to pass leaseSeconds parameter to websubhub:Service to implement a subscription timeout.
Developers should be able to pass additional websubhub:ClientConfiguration to underlying http:Client which is used to verify the intent of subscriptions / unsubscriptions.

Describe your solution(s)

Implement a service annotation for websubhub:Service which could be used to pass required additional configurations.

Samples

• Updated websubhub:ClientConfiguration which could be used for websubhub:HubClient / websubhub:PublisherClient is as follows.

public type ClientConfiguration record {|
    string httpVersion = HTTP_1_1;
    http:ClientHttp1Settings http1Settings = {};
    http:ClientHttp2Settings http2Settings = {};
    decimal timeout = 60;
    http:PoolConfiguration poolConfig?;
    http:RetryConfig retryConfig?;
    http:ResponseLimitConfigs responseLimits = {};
    http:ClientSecureSocket secureSocket?;
    http:CircuitBreakerConfig circuitBreaker?;
|};

• websubhub:ServiceConfig is an optional annotation configuration which could be included to websubhub:Service declaration. Following is a sample on how to use the websubhub:ServiceConfig. leaseSeconds and webHookConfig parameters in websubhub:ServiceConfig are also optional parameters.

@websubhub:ServiceConfig {
    leaseSeconds: 86400,
    webHookConfig: {
        secureSocket: {
            cert: {
                path: "tests/resources/ballerinaTruststore.pkcs12",
                password: "ballerina"
            }
         }
     }
}
service /websubhub on new Listener(9099) {
    isolated remote function onRegisterTopic(TopicRegistration message) returns TopicRegistrationSuccess {
        return TOPIC_REGISTRATION_SUCCESS;
    }
    // implement other service methods
}