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route.ts
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route.ts
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import * as cdk from '@aws-cdk/core';
import { CfnRoute } from './appmesh.generated';
import { IMesh } from './mesh';
import { IVirtualNode } from './virtual-node';
import { IVirtualRouter } from './virtual-router';
/**
* Interface for which all Route based classes MUST implement
*/
export interface IRoute extends cdk.IResource {
/**
* The name of the route
*
* @attribute
*/
readonly routeName: string;
/**
* The Amazon Resource Name (ARN) for the route
*
* @attribute
*/
readonly routeArn: string;
}
/**
* Base interface properties for all Routes
*/
export interface RouteBaseProps {
/**
* The name of the route
*
* @default - An automatically generated name
*/
readonly routeName?: string;
/**
* The path prefix to match for the route
*
* @default "/" if http otherwise none
*/
readonly prefix?: string;
/**
* Array of weighted route targets
*
* @requires minimum of 1
*/
readonly routeTargets: WeightedTargetProps[];
/**
* Weather the route is HTTP based
*
* @default - HTTP if `prefix` is given, TCP otherwise
*/
readonly routeType?: RouteType;
}
/**
* Type of route
*/
export enum RouteType {
/**
* HTTP route
*/
HTTP = 'http',
/**
* TCP route
*/
TCP = 'tcp'
}
/**
* Properties for the Weighted Targets in the route
*/
export interface WeightedTargetProps {
/**
* The VirtualNode the route points to
*/
readonly virtualNode: IVirtualNode;
/**
* The weight for the target
*
* @default 1
*/
readonly weight?: number;
}
/**
* Properties to define new Routes
*/
export interface RouteProps extends RouteBaseProps {
/**
* The service mesh to define the route in
*/
readonly mesh: IMesh;
/**
* The virtual router in which to define the route
*/
readonly virtualRouter: IVirtualRouter;
}
/**
* Route represents a new or existing route attached to a VirtualRouter and Mesh
*
* @see https://docs.aws.amazon.com/app-mesh/latest/userguide/routes.html
*/
export class Route extends cdk.Resource implements IRoute {
/**
* Import an existing route given an ARN
*/
public static fromRouteArn(scope: cdk.Construct, id: string, routeArn: string): IRoute {
return new ImportedRoute(scope, id, { routeArn });
}
/**
* Import an existing route given its name
*/
public static fromRouteName(scope: cdk.Construct, id: string, meshName: string, virtualRouterName: string, routeName: string): IRoute {
return new ImportedRoute(scope, id, { meshName, virtualRouterName, routeName });
}
/**
* The name of the route
*/
public readonly routeName: string;
/**
* The Amazon Resource Name (ARN) for the route
*/
public readonly routeArn: string;
/**
* The virtual router this route is a part of
*/
public readonly virtualRouter: IVirtualRouter;
private readonly weightedTargets = new Array<CfnRoute.WeightedTargetProperty>();
private readonly httpRoute?: CfnRoute.HttpRouteProperty;
private readonly tcpRoute?: CfnRoute.TcpRouteProperty;
constructor(scope: cdk.Construct, id: string, props: RouteProps) {
super(scope, id, {
physicalName: props.routeName || cdk.Lazy.stringValue({ produce: () => this.node.uniqueId }),
});
this.virtualRouter = props.virtualRouter;
const routeType = props.routeType !== undefined ? props.routeType :
props.prefix !== undefined ? RouteType.HTTP :
RouteType.TCP;
if (routeType === RouteType.HTTP) {
this.httpRoute = this.renderHttpRoute(props);
} else {
this.tcpRoute = this.renderTcpRoute(props);
}
const route = new CfnRoute(this, 'Resource', {
routeName: this.physicalName,
meshName: this.virtualRouter.mesh.meshName,
virtualRouterName: this.virtualRouter.virtualRouterName,
spec: {
tcpRoute: this.tcpRoute,
httpRoute: this.httpRoute,
},
});
this.routeName = this.getResourceNameAttribute(route.attrRouteName);
this.routeArn = this.getResourceArnAttribute(route.ref, {
service: 'appmesh',
resource: `mesh/${props.mesh.meshName}/virtualRouter/${props.virtualRouter.virtualRouterName}/route`,
resourceName: this.physicalName,
});
}
/**
* Utility method to add weighted route targets to an existing route
*/
private renderWeightedTargets(props: WeightedTargetProps[]) {
for (const t of props) {
this.weightedTargets.push({
virtualNode: t.virtualNode.virtualNodeName,
weight: t.weight || 1,
});
}
return this.weightedTargets;
}
private renderHttpRoute(props: RouteProps) {
return {
match: {
prefix: props.prefix || '/',
},
action: {
weightedTargets: this.renderWeightedTargets(props.routeTargets),
},
};
}
private renderTcpRoute(props: RouteProps) {
return {
action: {
weightedTargets: this.renderWeightedTargets(props.routeTargets),
},
};
}
}
/**
* Interface with properties ncecessary to import a reusable Route
*/
interface RouteAttributes {
/**
* The name of the route
*/
readonly routeName?: string;
/**
* The Amazon Resource Name (ARN) for the route
*/
readonly routeArn?: string;
/**
* The name of the mesh this route is associated with
*/
readonly meshName?: string;
/**
* The name of the virtual router this route is associated with
*/
readonly virtualRouterName?: string;
}
/**
* Represents and imported IRoute
*/
class ImportedRoute extends cdk.Resource implements IRoute {
/**
* The name of the route
*/
public readonly routeName: string;
/**
* The Amazon Resource Name (ARN) for the route
*/
public readonly routeArn: string;
constructor(scope: cdk.Construct, id: string, props: RouteAttributes) {
super(scope, id);
if (props.routeArn) {
this.routeArn = props.routeArn;
this.routeName = cdk.Fn.select(4, cdk.Fn.split('/', cdk.Stack.of(scope).parseArn(props.routeArn).resourceName!));
} else if (props.routeName && props.meshName && props.virtualRouterName) {
this.routeName = props.routeName;
this.routeArn = cdk.Stack.of(this).formatArn({
service: 'appmesh',
resource: `mesh/${props.meshName}/virtualRouter/${props.virtualRouterName}/route`,
resourceName: this.routeName,
});
} else {
throw new Error('Need either arn or three names');
}
}
}