feat(core-api): add active delegates endpoint

__tests__/integration/core-api/v2/handlers/delegates.test.ts

@@ -136,6 +136,25 @@ describe("API 2.0 - Delegates", () => {
         );
     });
 
+    describe("GET /delegates/active", () => {
+        describe.each([["API-Version", "request"], ["Accept", "requestWithAcceptHeader"]])(
+            "using the %s header",
+            (header, request) => {
+                it("should GET all the active delegates at a specified height", async () => {
+                    const activeDelegates = app.getConfig().getMilestone(1).activeDelegates;
+
+                    const response = await utils[request]("GET", "delegates/active", { height: 1 });
+                    expect(response).toBeSuccessfulResponse();
+                    expect(response.data.data).toBeArray();
+                    expect(response.data.data).toHaveLength(activeDelegates);
+
+                    response.data.data.forEach(utils.expectDelegate);
+                    expect(response.data.data.sort((a, b) => a.rank < b.rank)).toEqual(response.data.data);
+                });
+            },
+        );
+    });
+
     describe("GET /delegates/:id", () => {
         describe.each([["API-Version", "request"], ["Accept", "requestWithAcceptHeader"]])(
             "using the %s header",

__tests__/unit/core-database/repositories/delegates-business-repository.test.ts

@@ -405,10 +405,7 @@ describe("Delegate Repository", () => {
 
             expect(results).toBeArray();
             expect(results[0].username).toBeString();
-            expect(results[0].approval).toBeNumber();
-            expect(results[0].productivity).toBeNumber();
-            expect(results[0].approval).toBe(delegateCalculator.calculateApproval(delegate, height));
-            expect(results[0].productivity).toBe(delegateCalculator.calculateProductivity(delegate));
+            expect(results[0].username).toEqual(delegate.username);
         });
     });
 });

packages/core-api/src/versions/2/delegates/controller.ts

@@ -14,6 +14,17 @@ export class DelegatesController extends Controller {
         }
     }
 
+    public async active(request: Hapi.Request, h: Hapi.ResponseToolkit) {
+        try {
+            // @ts-ignore
+            const data = await request.server.methods.v2.delegates.active(request);
+
+            return super.respondWithCache(data, h);
+        } catch (error) {
+            return Boom.badImplementation(error);
+        }
+    }
+
     public async show(request: Hapi.Request, h: Hapi.ResponseToolkit) {
         try {
             // @ts-ignore

packages/core-api/src/versions/2/delegates/methods.ts

@@ -4,8 +4,9 @@ import { orderBy } from "@arkecosystem/utils";
 import Boom from "boom";
 import { blocksRepository } from "../../../repositories";
 import { ServerCache } from "../../../services";
-import { paginate, respondWithResource, toPagination } from "../utils";
+import { paginate, respondWithResource, respondWithCollection, toPagination } from "../utils";
 
+const config = app.getConfig();
 const databaseService = app.resolvePlugin<Database.IDatabaseService>("database");
 
 const index = async request => {
@@ -17,6 +18,16 @@ const index = async request => {
     return toPagination(request, delegates, "delegate");
 };
 
+const active = async request => {
+    const delegates = await databaseService.delegates.getActiveAtHeight(request.query.height);
+
+    if (!delegates.length) {
+        return Boom.notFound("Delegates not found");
+    }
+
+    return respondWithCollection(request, delegates, "delegate");
+};
+
 const show = async request => {
     const delegate = await databaseService.delegates.findById(request.params.id);
 
@@ -82,11 +93,16 @@ const voterBalances = async request => {
 };
 
 export function registerMethods(server) {
+    const { activeDelegates, blocktime } = config.getMilestone();
+
     ServerCache.make(server)
         .method("v2.delegates.index", index, 8, request => ({
             ...request.query,
             ...paginate(request),
         }))
+        .method("v2.delegates.active", active, activeDelegates * blocktime, request => ({
+            ...request.query
+        }))
         .method("v2.delegates.show", show, 8, request => ({ id: request.params.id }))
         .method("v2.delegates.search", search, 30, request => ({
             ...request.payload,

packages/core-api/src/versions/2/delegates/routes.ts

@@ -15,6 +15,15 @@ export function registerRoutes(server: Hapi.Server): void {
         },
     });
 
+    server.route({
+        method: "GET",
+        path: "/delegates/active",
+        handler: controller.active,
+        options: {
+            validate: Schema.active,
+        },
+    });
+
     server.route({
         method: "GET",
         path: "/delegates/{id}",

packages/core-api/src/versions/2/delegates/schema.ts

@@ -74,6 +74,15 @@ export const index: object = {
     },
 };
 
+export const active: object = {
+    query: {
+        height: Joi.number()
+            .integer()
+            .min(1)
+            .required(),
+    }
+};
+
 export const show: object = {
     params: {
         id: schemaIdentifier,

packages/core-database/src/repositories/delegates-business-repository.ts

@@ -150,13 +150,7 @@ export class DelegatesBusinessRepository implements Database.IDelegatesBusinessR
         const delegates = await this.databaseServiceProvider().getActiveDelegates(height);
 
         return delegates.map(delegate => {
-            const wallet = this.databaseServiceProvider().wallets.findById(delegate.publicKey);
-
-            return {
-                username: wallet.username,
-                approval: delegateCalculator.calculateApproval(delegate, height),
-                productivity: delegateCalculator.calculateProductivity(wallet),
-            };
+            return this.databaseServiceProvider().wallets.findById(delegate.publicKey);
         });
     }
 

packages/core-interfaces/src/core-database/business-repository/delegates-business-repository.ts

@@ -10,5 +10,5 @@ export interface IDelegatesBusinessRepository {
 
     findById(id: string): models.Wallet;
 
-    getActiveAtHeight(height: number): Promise<Array<{ username: string; approval: number; productivity: number }>>;
+    getActiveAtHeight(height: number): Promise<models.Wallet[]>;
 }

packages/core-p2p/src/peer-verifier.ts

@@ -300,7 +300,7 @@ export class PeerVerifier {
         // the last block in a round (so that the delegates calculations are still the same for
         // both chains).
 
-        const delegates = await this.getDelegates(round);
+        const delegates = await this.getDelegatesByRound(round);
 
         const hisBlocksByHeight = {};
 
@@ -324,10 +324,10 @@ export class PeerVerifier {
 
     /**
      * Get the delegates for the given round.
-     * @param {Object} round round to get delegates for
+     * @param {Object} round to get delegates for
      * @return {Object} a map of { publicKey: delegate, ... } of all delegates for the given round
      */
-    private async getDelegates(round: any): Promise<any> {
+    private async getDelegatesByRound(round: any): Promise<any> {
         const numDelegates = round.maxDelegates;
 
         const heightOfFirstBlockInRound = (round.round - 1) * numDelegates + 1;