cdk-monitoring-constructs
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50 lines • 9.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createLoadBalancerMetricFactory = void 0;
const ApplicationLoadBalancerMetricFactory_1 = require("./ApplicationLoadBalancerMetricFactory");
const NetworkLoadBalancerMetricFactory_1 = require("./NetworkLoadBalancerMetricFactory");
// It's not possible to use instanceOf with typescript interfaces, so we have to use type guards to differentiate
// between the interfaces. As another problem, the LoadBalancer/TargetGroup for both Network and Application types
// don't have distinguished fields that could be used to differentiate between both types, so we resort to using
// checking for unique methods in their metrics interfaces.
function isApplicationLoadBalancer(loadBalancer) {
return !!loadBalancer.metrics.httpRedirectCount;
}
function isNetworkLoadBalancer(loadBalancer) {
return !isApplicationLoadBalancer(loadBalancer);
}
function isApplicationTargetGroup(targetGroup) {
return !!targetGroup.metrics.httpCodeTarget;
}
function isNetworkTargetGroup(targetGroup) {
return !isApplicationTargetGroup(targetGroup);
}
/**
* Factory method to create appropriate metric factory based on the load balancer and target group type.
* @param metricFactory metric factory
* @param loadBalancer load balancer
* @param targetGroup target group
*/
function createLoadBalancerMetricFactory(metricFactory, loadBalancer, targetGroup, invertStatisticsOfTaskCountEnabled) {
if (isNetworkLoadBalancer(loadBalancer) &&
isNetworkTargetGroup(targetGroup)) {
return new NetworkLoadBalancerMetricFactory_1.NetworkLoadBalancerMetricFactory(metricFactory, {
networkLoadBalancer: loadBalancer,
networkTargetGroup: targetGroup,
invertStatisticsOfTaskCountEnabled: invertStatisticsOfTaskCountEnabled,
});
}
else if (isApplicationLoadBalancer(loadBalancer) &&
isApplicationTargetGroup(targetGroup)) {
return new ApplicationLoadBalancerMetricFactory_1.ApplicationLoadBalancerMetricFactory(metricFactory, {
applicationLoadBalancer: loadBalancer,
applicationTargetGroup: targetGroup,
invertStatisticsOfTaskCountEnabled: invertStatisticsOfTaskCountEnabled,
});
}
else {
throw new Error("Invalid type of load balancer or target group (only ALB and NLB are supported).");
}
}
exports.createLoadBalancerMetricFactory = createLoadBalancerMetricFactory;
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