FLS-1452 - Abstract Redis and Catbox cache clients in AdapterCacheService

wjrm500 · wjrm500 · commit a31108ec136c · 2025-09-11T19:47:31.000+01:00
This commit introduces a common interface attribute formStorage on the AdapterCacheService to represent either a Redis client or a Catbox (in-memory) cache client. This enables us to save significant lines of code, where previously we branched off to different functions depending on whether we were using Redis or not, now we can concentrate logic in fewer functions with no branching. We're able to do this because the way we use the two clients is almost identical since we no longer need getKeys functionality. Previously, because the Catbox cache client doesn't have a getKeys utility built-in like Redis, special code was required to keep track of the keys in the cache in the case of Catbox.
diff --git a/runner/src/server/plugins/engine/MainPlugin.ts b/runner/src/server/plugins/engine/MainPlugin.ts
@@ -18,7 +18,7 @@ export const plugin = {
         let countError = 0;
         for (const config of configs) {
             try {
-                await adapterCacheService.setFormConfiguration(config.id, config, server);
+                await adapterCacheService.setFormConfiguration(config.id, config);
                 countOk++;
             } catch (e) {
                 countError++;
diff --git a/runner/src/server/services/AdapterCacheService.ts b/runner/src/server/services/AdapterCacheService.ts
@@ -15,8 +15,6 @@ import Crypto from 'crypto';
 import {HapiRequest, HapiServer} from "../types";
 import {AdapterFormModel} from "../plugins/engine/models";
 import Boom from "boom";
-import {FormConfiguration} from "@xgovformbuilder/model";
-import {AdapterSchema} from "@communitiesuk/model";
 
 const partition = "cache";
 const LOGGER_DATA = {
@@ -59,22 +57,26 @@ const createRedisClient = (): Redis | null => {
 };
 
 export class AdapterCacheService extends CacheService {
+    private formStorage: Redis | any;
 
     constructor(server: HapiServer) {
         //@ts-ignore
         super(server);
-        //@ts-ignore
-        server.app.redis = this.getRedisClient()
-        //@ts-ignore
-        if (!server.app.redis) {
-            // starting up the in memory cache
+        const redisClient = this.getRedisClient();
+        if (redisClient) {
+            this.formStorage = redisClient;
+        } else {
+            // Starting up the in memory cache
             this.cache.client.start();
-            //@ts-ignore
-            server.app.inMemoryFormKeys = []
+            this.formStorage = {
+                get: (key) => this.cache.get(key),
+                set: (key, value) => this.cache.set(key, value, {expiresIn: 0}),
+                setex: (key, ttl, value) => this.cache.set(key, value, {expiresIn: ttl}),
+            }
         }
     }
 
-    async activateSession(jwt, request) {
+    async activateSession(jwt, request): Promise<{ redirectPath: string }> {
         request.logger.info(`[ACTIVATE-SESSION] jwt ${jwt}`);
         const initialisedSession = await this.cache.get(this.JWTKey(jwt));
         request.logger.info(`[ACTIVATE-SESSION] session details ${initialisedSession}`);
@@ -83,14 +85,12 @@ export class AdapterCacheService extends CacheService {
         const userSessionKey = {segment: partition, id: `${request.yar.id}:${payload.group}`};
         request.logger.info(`[ACTIVATE-SESSION] session metadata ${userSessionKey}`);
         const {redirectPath} = await super.activateSession(jwt, request);
-
         let redirectPathNew = redirectPath
         const form_session_identifier = initialisedSession.metadata?.form_session_identifier;
         if (form_session_identifier) {
             userSessionKey.id = `${userSessionKey.id}:${form_session_identifier}`;
             redirectPathNew = `${redirectPathNew}?form_session_identifier=${form_session_identifier}`;
         }
-
         if (config.overwriteInitialisedSession) {
             request.logger.info("[ACTIVATE-SESSION] Replacing user session with initialisedSession");
             this.cache.set(userSessionKey, initialisedSession, sessionTimeout);
@@ -120,7 +120,7 @@ export class AdapterCacheService extends CacheService {
      * @param additionalIdentifier - appended to the id
      */
     //@ts-ignore
-    Key(request: HapiRequest, additionalIdentifier?: ADDITIONAL_IDENTIFIER) {
+    Key(request: HapiRequest, additionalIdentifier?: ADDITIONAL_IDENTIFIER): { segment: string; id: string } {
         let id = `${request.yar.id}:${request.params.id}`;
 
         if (request.query.form_session_identifier) {
@@ -141,117 +141,44 @@ export class AdapterCacheService extends CacheService {
      * @param configuration form definition configurations
      * @param server server object
      */
-    async setFormConfiguration(formId: string, configuration: any, server: HapiServer) {
-        if (formId && configuration) {
-            //@ts-ignore
-            if (server.app.redis) {
-                await this.addConfigurationsToRedisCache(server, configuration, formId);
-            } else {
-                await this.addConfigurationIntoInMemoryCache(configuration, formId, server);
-            }
-        }
-    }
-
-    private async addConfigurationIntoInMemoryCache(configuration: any, formId: string, server: HapiServer) {
-        const hashValue = Crypto.createHash('sha256').update(JSON.stringify(configuration)).digest('hex')
+    async setFormConfiguration(formId: string, configuration: any): Promise<void> {
+        if (!formId || !configuration) return;
+        const hashValue = Crypto.createHash('sha256')
+            .update(JSON.stringify(configuration))
+            .digest('hex');
+        const key = `${FORMS_KEY_PREFIX}${formId}`;
         try {
-            const jsonDataString = await this.cache.get(`${FORMS_KEY_PREFIX}${formId}`);
-            if (jsonDataString === null) {
-                // Adding new config into redis cache service with the hash value
+            const existingConfigString = await this.formStorage.get(key);
+            if (existingConfigString === null) {
+                // Adding new config with the hash value
                 const stringConfig = JSON.stringify({
                     ...configuration,
                     id: configuration.id,
                     hash: hashValue
                 });
-                //@ts-ignore
-                server.app.inMemoryFormKeys.push(`${FORMS_KEY_PREFIX}${formId}`)
-                // Adding data into redis cache
-                await this.cache.set(`${FORMS_KEY_PREFIX}${formId}`, stringConfig, {expiresIn: 0});
+                await this.formStorage.set(key, stringConfig);
             } else {
-                // Redis has the data and gets current data set to check hash
-                const configObj = JSON.parse(jsonDataString);
-                if (configObj && configObj.hash && hashValue !== configObj.hash) {
-                    // if hash function is change then updating the configuration
+                // Check if hash has changed
+                const existingConfig = JSON.parse(existingConfigString);
+                if (existingConfig?.hash !== hashValue) {
+                    // Hash has changed, update the configuration
                     const stringConfig = JSON.stringify({
                         ...configuration,
                         id: configuration.id,
                         hash: hashValue
                     });
-                    await this.cache.set(`${FORMS_KEY_PREFIX}${formId}`, stringConfig, {expiresIn: 0});
+                    await this.formStorage.set(key, stringConfig);
                 }
             }
         } catch (error) {
             console.log(error);
         }
     }
 
-    private async addConfigurationsToRedisCache(server: HapiServer, configuration: any, formId: string) {
-        //@ts-ignore
-        const redisClient: Redis = server.app.redis
-        const hashValue = Crypto.createHash('sha256').update(JSON.stringify(configuration)).digest('hex')
-        if (redisClient) {
-            const jsonDataString = await redisClient.get(`${FORMS_KEY_PREFIX}${formId}`);
-            if (jsonDataString === null) {
-                // Adding new config into redis cache service with the hash value
-                const stringConfig = JSON.stringify({
-                    ...configuration,
-                    id: configuration.id,
-                    hash: hashValue
-                });
-                // Adding data into redis cache
-                await redisClient.set(`${FORMS_KEY_PREFIX}${formId}`, stringConfig);
-            } else {
-                // Redis has the data and gets current data set to check hash
-                const configObj = JSON.parse(jsonDataString);
-                if (configObj && configObj.hash && hashValue !== configObj.hash) {
-                    // if hash function is change then updating the configuration
-                    const stringConfig = JSON.stringify({
-                        ...configuration,
-                        id: configuration.id,
-                        hash: hashValue
-                    });
-                    await redisClient.set(`${FORMS_KEY_PREFIX}${formId}`, stringConfig);
-                }
-            }
-        }
-    }
-
-    async getFormAdapterModel(formId: string, request: HapiRequest) {
-        //@ts-ignore
-        if (request.server.app.redis) {
-            return await this.getConfigurationFromRedisCache(request, formId);
-        } else {
-            return await this.getConfigurationFromInMemoryCache(request, formId);
-        }
-    }
-
-    private async getConfigurationFromInMemoryCache(request: HapiRequest, formId: string) {
-        const {translationLoaderService} = request.services([]);
-        const translations = translationLoaderService.getTranslations();
-        const jsonDataString = await this.cache.get(`${FORMS_KEY_PREFIX}${formId}`);
-        if (jsonDataString !== null) {
-            const configObj = JSON.parse(jsonDataString);
-            return new AdapterFormModel(configObj.configuration, {
-                basePath: configObj.id ? configObj.id : formId,
-                hash: configObj.hash,
-                previewMode: true,
-                translationEn: translations.en,
-                translationCy: translations.cy
-            })
-        }
-        request.logger.error({
-            ...LOGGER_DATA,
-            message: `[FORM-CACHE] Cannot find the form ${formId}`
-        });
-        throw Boom.notFound("Cannot find the given form");
-    }
-
-    private async getConfigurationFromRedisCache(request: HapiRequest, formId: string) {
-        //@ts-ignore
-        const redisClient: Redis = request.server.app.redis
+    async getFormAdapterModel(formId: string, request: HapiRequest): Promise<AdapterFormModel> {
         const {translationLoaderService} = request.services([]);
         const translations = translationLoaderService.getTranslations();
-        const jsonDataString = await redisClient.get(`${FORMS_KEY_PREFIX}${formId}`);
+        const jsonDataString = await this.formStorage.get(`${FORMS_KEY_PREFIX}${formId}`);
         if (jsonDataString !== null) {
             const configObj = JSON.parse(jsonDataString);
             return new AdapterFormModel(configObj.configuration, {
@@ -260,7 +187,7 @@ export class AdapterCacheService extends CacheService {
                 previewMode: true,
                 translationEn: translations.en,
                 translationCy: translations.cy
-            })
+            });
         }
         request.logger.error({
             ...LOGGER_DATA,
