Add cache to CloudAPL

.changeset/four-carpets-watch.md

@@ -0,0 +1,5 @@
+---
+"@saleor/app-sdk": minor
+---
+
+Saleor Cloud APL will now use built-in cache by default.

src/APL/saleor-cloud/saleor-cloud-apl-errors.ts

@@ -4,3 +4,11 @@ export class SaleorCloudAplError extends Error {
     this.name = "SaleorCloudAplError";
   }
 }
+
+export const CloudAplError = {
+  FAILED_TO_REACH_API: "FAILED_TO_REACH_API",
+  RESPONSE_BODY_INVALID: "RESPONSE_BODY_INVALID",
+  RESPONSE_NON_200: "RESPONSE_NON_200",
+  ERROR_SAVING_DATA: "ERROR_SAVING_DATA",
+  ERROR_DELETING_DATA: "ERROR_DELETING_DATA",
+};

src/APL/saleor-cloud/saleor-cloud-apl.test.ts

@@ -161,6 +161,37 @@ describe("APL", () => {
 
           expect(await apl.get("http://unknown-domain.example.com/graphql/")).toBe(undefined);
         });
+
+        it("Uses cache when GET call is called 2nd time", async () => {
+          fetchMock.mockResolvedValue({
+            status: 200,
+            ok: true,
+            json: async () => ({
+              saleor_app_id: stubAuthData.appId,
+              saleor_api_url: stubAuthData.saleorApiUrl,
+              jwks: stubAuthData.jwks,
+              domain: stubAuthData.domain,
+              token: stubAuthData.token,
+            }),
+          });
+
+          const apl = new SaleorCloudAPL(aplConfig);
+
+          expect(await apl.get(stubAuthData.saleorApiUrl)).toStrictEqual(stubAuthData);
+          expect(await apl.get(stubAuthData.saleorApiUrl)).toStrictEqual(stubAuthData);
+
+          expect(fetchMock).toBeCalledTimes(1);
+          expect(fetchMock).toBeCalledWith(
+            "https://example.com/aHR0cHM6Ly9leGFtcGxlLmNvbS9ncmFwaHFsLw", // base64 encoded api url
+            {
+              headers: {
+                "Content-Type": "application/json",
+                Authorization: "Bearer token",
+              },
+              method: "GET",
+            }
+          );
+        });
       });
     });
 

src/APL/saleor-cloud/saleor-cloud-apl.ts

@@ -6,13 +6,14 @@ import { getOtelTracer, OTEL_APL_SERVICE_NAME } from "../../open-telemetry";
 import { APL, AplConfiguredResult, AplReadyResult, AuthData } from "../apl";
 import { createAPLDebug } from "../apl-debug";
 import { authDataFromObject } from "../auth-data-from-object";
-import { SaleorCloudAplError } from "./saleor-cloud-apl-errors";
+import { CloudAplError, SaleorCloudAplError } from "./saleor-cloud-apl-errors";
 
 const debug = createAPLDebug("SaleorCloudAPL");
 
 export type SaleorCloudAPLConfig = {
   resourceUrl: string;
   token: string;
+  cacheManager?: Map<string, AuthData>;
 };
 
 type CloudAPLAuthDataShape = {
@@ -28,14 +29,6 @@ export type GetAllAplResponseShape = {
   results: CloudAPLAuthDataShape[];
 };
 
-export const CloudAplError = {
-  FAILED_TO_REACH_API: "FAILED_TO_REACH_API",
-  RESPONSE_BODY_INVALID: "RESPONSE_BODY_INVALID",
-  RESPONSE_NON_200: "RESPONSE_NON_200",
-  ERROR_SAVING_DATA: "ERROR_SAVING_DATA",
-  ERROR_DELETING_DATA: "ERROR_DELETING_DATA",
-};
-
 const validateResponseStatus = (response: Response) => {
   if (!response.ok) {
     debug("Response failed with status %s", response.status);
@@ -92,13 +85,16 @@ export class SaleorCloudAPL implements APL {
 
   private tracer: Tracer;
 
+  private cacheManager: Map<string, AuthData>;
+
   constructor(config: SaleorCloudAPLConfig) {
     this.resourceUrl = config.resourceUrl;
     this.headers = {
       Authorization: `Bearer ${config.token}`,
     };
 
     this.tracer = getOtelTracer();
+    this.cacheManager = config.cacheManager ?? new Map<string, AuthData>();
   }
 
   private getUrlForDomain(saleorApiUrl: string) {
@@ -107,6 +103,13 @@ export class SaleorCloudAPL implements APL {
   }
 
   async get(saleorApiUrl: string): Promise<AuthData | undefined> {
+    const cachedData = this.cacheManager.get(saleorApiUrl);
+
+    if (cachedData) {
+      debug("Returning authData from cache for saleorApiUrl %s", saleorApiUrl)
+      return cachedData;
+    }
+
     debug("Will fetch data from SaleorCloudAPL for saleorApiUrl %s", saleorApiUrl);
 
     return this.tracer.startActiveSpan(
@@ -224,6 +227,8 @@ export class SaleorCloudAPL implements APL {
 
         span.setAttribute("appId", authData.appId);
 
+        this.cacheManager.set(saleorApiUrl, authData);
+
         span.end();
 
         return authData;
@@ -270,6 +275,8 @@ export class SaleorCloudAPL implements APL {
 
         debug("Set command finished successfully for saleorApiUrl: %", authData.saleorApiUrl);
 
+        this.cacheManager.set(authData.saleorApiUrl, authData);
+
         span.setStatus({
           code: SpanStatusCode.OK,
         });
@@ -289,6 +296,8 @@ export class SaleorCloudAPL implements APL {
         headers: { "Content-Type": "application/json", ...this.headers },
       });
 
+      this.cacheManager.delete(saleorApiUrl);
+
       debug(`Delete responded with ${response.status} code`);
     } catch (error) {
       const errorMessage = extractErrorMessage(error);