[#171435619] get only latest services

GetServices/__tests__/handler.test.ts

@@ -2,15 +2,18 @@
 
 import { left, right } from "fp-ts/lib/Either";
 
-import { aRetrievedService } from "../../__mocks__/mocks";
+import { none, some } from "fp-ts/lib/Option";
+import { aRetrievedService, aSeralizedService } from "../../__mocks__/mocks";
 import { GetServicesHandler } from "../handler";
 
 describe("GetServices", () => {
   it("Should return a query error when a database error occurs", async () => {
     const mockServiceModel = {
-      getCollectionIterator: jest.fn(() => {
-        return Promise.resolve(left({}));
-      })
+      getCollectionIterator: jest.fn(() =>
+        Promise.resolve({
+          executeNext: () => Promise.resolve(left(new Error()))
+        })
+      )
     };
 
     const getServicesHandler = GetServicesHandler(mockServiceModel as any);
@@ -23,14 +26,33 @@ describe("GetServices", () => {
     );
 
     expect(mockServiceModel.getCollectionIterator).toHaveBeenCalledWith();
-    expect(response.kind).toBe("IResponseSuccessJsonIterator");
+    expect(response.kind).toBe("IResponseErrorQuery");
   });
 
   it("Should return the collection of services from the database", async () => {
     const mockServiceModel = {
       getCollectionIterator: jest.fn(() =>
         Promise.resolve({
-          executeNext: () => Promise.resolve(right([aRetrievedService]))
+          executeNext: jest
+            .fn()
+            .mockImplementationOnce(() =>
+              Promise.resolve(
+                right(
+                  some([
+                    aRetrievedService,
+                    {
+                      ...aRetrievedService,
+                      version: 3
+                    },
+                    {
+                      ...aRetrievedService,
+                      version: 2
+                    }
+                  ])
+                )
+              )
+            )
+            .mockImplementationOnce(() => Promise.resolve(right(none)))
         })
       )
     };
@@ -45,6 +67,18 @@ describe("GetServices", () => {
     );
 
     expect(mockServiceModel.getCollectionIterator).toHaveBeenCalledWith();
-    expect(response.kind).toBe("IResponseSuccessJsonIterator");
+    expect(response.kind).toBe("IResponseSuccessJson");
+    if (response.kind === "IResponseSuccessJson") {
+      expect(response.value).toEqual({
+        items: [
+          {
+            ...aSeralizedService,
+            service_metadata: undefined,
+            version: 3
+          }
+        ],
+        page_size: 1
+      });
+    }
   });
 });

GetServices/handler.ts

@@ -3,7 +3,11 @@ import { Context } from "@azure/functions";
 import * as express from "express";
 
 import { ServiceModel } from "io-functions-commons/dist/src/models/service";
-import { mapResultIterator } from "io-functions-commons/dist/src/utils/documentdb";
+import {
+  IFoldableResultIterator,
+  iteratorToValue,
+  reduceResultIterator
+} from "io-functions-commons/dist/src/utils/documentdb";
 import {
   AzureApiAuthMiddleware,
   IAzureApiAuthorization,
@@ -23,34 +27,63 @@ import {
   wrapRequestHandler
 } from "io-functions-commons/dist/src/utils/request_middleware";
 import {
-  IResponseSuccessJsonIterator,
-  ResponseJsonIterator
+  IResponseErrorQuery,
+  ResponseErrorQuery
 } from "io-functions-commons/dist/src/utils/response";
 import {
   checkSourceIpForHandler,
   clientIPAndCidrTuple as ipTuple
 } from "io-functions-commons/dist/src/utils/source_ip_check";
 
+import { collect, StrMap } from "fp-ts/lib/StrMap";
+import {
+  IResponseSuccessJson,
+  ResponseSuccessJson
+} from "italia-ts-commons/lib/responses";
 import { Service as ApiService } from "../generated/definitions/Service";
 import { retrievedServiceToApiService } from "../utils/conversions";
 
+type IGetServicesHandlerResult =
+  | IResponseErrorQuery
+  | IResponseSuccessJson<{ items: readonly ApiService[]; page_size: number }>;
+
 type IGetServicesHandler = (
   context: Context,
   auth: IAzureApiAuthorization,
   clientIp: ClientIp,
   userAttributes: IAzureUserAttributes
-) => Promise<IResponseSuccessJsonIterator<ApiService>>;
+) => Promise<IGetServicesHandlerResult>;
 
 export function GetServicesHandler(
   serviceModel: ServiceModel
 ): IGetServicesHandler {
   return async (_, __, ___, ____) => {
     const allRetrievedServicesIterator = await serviceModel.getCollectionIterator();
-    const allServicesIterator = mapResultIterator(
-      allRetrievedServicesIterator,
-      retrievedServiceToApiService
+    const allServicesIterator: IFoldableResultIterator<
+      Record<string, ApiService>
+    > = reduceResultIterator(allRetrievedServicesIterator, (prev, curr) => {
+      // keep only the latest version
+      const isNewer =
+        !prev[curr.serviceId] || curr.version > prev[curr.serviceId].version;
+      return {
+        ...prev,
+        ...(isNewer
+          ? { [curr.serviceId]: retrievedServiceToApiService(curr) }
+          : {})
+      };
+    });
+    return (await iteratorToValue(allServicesIterator, {})).fold<
+      IGetServicesHandlerResult
+    >(
+      error => ResponseErrorQuery("Cannot get services", error),
+      services => {
+        const items = collect(new StrMap(services), (_____, v) => v);
+        return ResponseSuccessJson({
+          items,
+          page_size: items.length
+        });
+      }
     );
-    return ResponseJsonIterator(allServicesIterator);
   };
 }