3 files changed, 69 insertions, 157 deletions

diff --git a/server/lib/plugins/plugin-manager.ts b/server/lib/plugins/plugin-manager.ts
index ff00ab9e8..39e7f9a5b 100644
--- a/server/lib/plugins/plugin-manager.ts
+++ b/server/lib/plugins/plugin-manager.ts
@@ -5,7 +5,13 @@ import { basename, join } from 'path'
 import { decachePlugin } from '@server/helpers/decache'
 import { MOAuthTokenUser, MUser } from '@server/types/models'
 import { getCompleteLocale } from '@shared/core-utils'
-import { ClientScriptJSON, PluginPackageJSON, PluginTranslation, PluginTranslationPathsJSON, RegisterServerHookOptions } from '@shared/models'
+import {
+  ClientScriptJSON,
+  PluginPackageJSON,
+  PluginTranslation,
+  PluginTranslationPathsJSON,
+  RegisterServerHookOptions
+} from '@shared/models'
 import { getHookType, internalRunHook } from '../../../shared/core-utils/plugins/hooks'
 import { PluginType } from '../../../shared/models/plugins/plugin.type'
 import { ServerHook, ServerHookName } from '../../../shared/models/plugins/server/server-hook.model'
diff --git a/server/lib/redis.ts b/server/lib/redis.ts
index 8aec4b793..0478bfc89 100644
--- a/server/lib/redis.ts
+++ b/server/lib/redis.ts
@@ -1,31 +1,29 @@
 import express from 'express'
-import { createClient, RedisClient } from 'redis'
+import { createClient } from 'redis'
+import { exists } from '@server/helpers/custom-validators/misc'
 import { logger } from '../helpers/logger'
 import { generateRandomString } from '../helpers/utils'
+import { CONFIG } from '../initializers/config'
 import {
   CONTACT_FORM_LIFETIME,
+  RESUMABLE_UPLOAD_SESSION_LIFETIME,
+  TRACKER_RATE_LIMITS,
   USER_EMAIL_VERIFY_LIFETIME,
-  USER_PASSWORD_RESET_LIFETIME,
   USER_PASSWORD_CREATE_LIFETIME,
+  USER_PASSWORD_RESET_LIFETIME,
   VIEW_LIFETIME,
-  WEBSERVER,
-  TRACKER_RATE_LIMITS,
-  RESUMABLE_UPLOAD_SESSION_LIFETIME
+  WEBSERVER
 } from '../initializers/constants'
-import { CONFIG } from '../initializers/config'
-import { exists } from '@server/helpers/custom-validators/misc'
 
-type CachedRoute = {
-  body: string
-  contentType?: string
-  statusCode?: string
-}
+// Only used for typings
+const redisClientWrapperForType = () => createClient<{}>()
 
 class Redis {
 
   private static instance: Redis
   private initialized = false
-  private client: RedisClient
+  private connected = false
+  private client: ReturnType<typeof redisClientWrapperForType>
   private prefix: string
 
   private constructor () {
@@ -38,21 +36,24 @@ class Redis {
 
     this.client = createClient(Redis.getRedisClientOptions())
 
+    this.client.connect()
+      .then(() => { this.connected = true })
+      .catch(err => {
+        logger.error('Cannot connect to redis', { err })
+        process.exit(-1)
+      })
+
     this.client.on('error', err => {
       logger.error('Error in Redis client.', { err })
       process.exit(-1)
     })
 
-    if (CONFIG.REDIS.AUTH) {
-      this.client.auth(CONFIG.REDIS.AUTH)
-    }
-
     this.prefix = 'redis-' + WEBSERVER.HOST + '-'
   }
 
   static getRedisClientOptions () {
     return Object.assign({},
-      (CONFIG.REDIS.AUTH && CONFIG.REDIS.AUTH != null) ? { password: CONFIG.REDIS.AUTH } : {},
+      CONFIG.REDIS.AUTH ? { password: CONFIG.REDIS.AUTH } : {},
       (CONFIG.REDIS.DB) ? { db: CONFIG.REDIS.DB } : {},
       (CONFIG.REDIS.HOSTNAME && CONFIG.REDIS.PORT)
         ? { host: CONFIG.REDIS.HOSTNAME, port: CONFIG.REDIS.PORT }
@@ -68,6 +69,10 @@ class Redis {
     return this.prefix
   }
 
+  isConnected () {
+    return this.connected
+  }
+
   /* ************ Forgot password ************ */
 
   async setResetPasswordVerificationString (userId: number) {
@@ -146,25 +151,6 @@ class Redis {
     return this.exists(this.generateTrackerBlockIPKey(ip))
   }
 
-  /* ************ API cache ************ */
-
-  async getCachedRoute (req: express.Request) {
-    const cached = await this.getObject(this.generateCachedRouteKey(req))
-
-    return cached as CachedRoute
-  }
-
-  setCachedRoute (req: express.Request, body: any, lifetime: number, contentType?: string, statusCode?: number) {
-    const cached: CachedRoute = Object.assign(
-      {},
-      { body: body.toString() },
-      (contentType) ? { contentType } : null,
-      (statusCode) ? { statusCode: statusCode.toString() } : null
-    )
-
-    return this.setObject(this.generateCachedRouteKey(req), cached, lifetime)
-  }
-
   /* ************ Video views stats ************ */
 
   addVideoViewStats (videoId: number) {
@@ -277,10 +263,6 @@ class Redis {
 
   /* ************ Keys generation ************ */
 
-  generateCachedRouteKey (req: express.Request) {
-    return req.method + '-' + req.originalUrl
-  }
-
   private generateLocalVideoViewsKeys (videoId?: Number) {
     return { setKey: `local-video-views-buffer`, videoKey: `local-video-views-buffer-${videoId}` }
   }
@@ -320,125 +302,45 @@ class Redis {
   /* ************ Redis helpers ************ */
 
   private getValue (key: string) {
-    return new Promise<string>((res, rej) => {
-      this.client.get(this.prefix + key, (err, value) => {
-        if (err) return rej(err)
-
-        return res(value)
-      })
-    })
+    return this.client.get(this.prefix + key)
   }
 
   private getSet (key: string) {
-    return new Promise<string[]>((res, rej) => {
-      this.client.smembers(this.prefix + key, (err, value) => {
-        if (err) return rej(err)
-
-        return res(value)
-      })
-    })
+    return this.client.sMembers(this.prefix + key)
   }
 
   private addToSet (key: string, value: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.sadd(this.prefix + key, value, err => err ? rej(err) : res())
-    })
+    return this.client.sAdd(this.prefix + key, value)
   }
 
   private deleteFromSet (key: string, value: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.srem(this.prefix + key, value, err => err ? rej(err) : res())
-    })
+    return this.client.sRem(this.prefix + key, value)
   }
 
   private deleteKey (key: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.del(this.prefix + key, err => err ? rej(err) : res())
-    })
-  }
-
-  private deleteFieldInHash (key: string, field: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.hdel(this.prefix + key, field, err => err ? rej(err) : res())
-    })
+    return this.client.del(this.prefix + key)
   }
 
-  private setValue (key: string, value: string, expirationMilliseconds: number) {
-    return new Promise<void>((res, rej) => {
-      this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => {
-        if (err) return rej(err)
-
-        if (ok !== 'OK') return rej(new Error('Redis set result is not OK.'))
+  private async setValue (key: string, value: string, expirationMilliseconds: number) {
+    const result = await this.client.set(this.prefix + key, value, { PX: expirationMilliseconds })
 
-        return res()
-      })
-    })
+    if (result !== 'OK') throw new Error('Redis set result is not OK.')
   }
 
   private removeValue (key: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.del(this.prefix + key, err => {
-        if (err) return rej(err)
-
-        return res()
-      })
-    })
-  }
-
-  private setObject (key: string, obj: { [id: string]: string }, expirationMilliseconds: number) {
-    return new Promise<void>((res, rej) => {
-      this.client.hmset(this.prefix + key, obj, (err, ok) => {
-        if (err) return rej(err)
-        if (!ok) return rej(new Error('Redis mset result is not OK.'))
-
-        this.client.pexpire(this.prefix + key, expirationMilliseconds, (err, ok) => {
-          if (err) return rej(err)
-          if (!ok) return rej(new Error('Redis expiration result is not OK.'))
-
-          return res()
-        })
-      })
-    })
+    return this.client.del(this.prefix + key)
   }
 
   private getObject (key: string) {
-    return new Promise<{ [id: string]: string }>((res, rej) => {
-      this.client.hgetall(this.prefix + key, (err, value) => {
-        if (err) return rej(err)
-
-        return res(value)
-      })
-    })
-  }
-
-  private setValueInHash (key: string, field: string, value: string) {
-    return new Promise<void>((res, rej) => {
-      this.client.hset(this.prefix + key, field, value, (err) => {
-        if (err) return rej(err)
-
-        return res()
-      })
-    })
+    return this.client.hGetAll(this.prefix + key)
   }
 
   private increment (key: string) {
-    return new Promise<number>((res, rej) => {
-      this.client.incr(this.prefix + key, (err, value) => {
-        if (err) return rej(err)
-
-        return res(value)
-      })
-    })
+    return this.client.incr(this.prefix + key)
   }
 
   private exists (key: string) {
-    return new Promise<boolean>((res, rej) => {
-      this.client.exists(this.prefix + key, (err, existsNumber) => {
-        if (err) return rej(err)
-
-        return res(existsNumber === 1)
-      })
-    })
+    return this.client.exists(this.prefix + key)
   }
 
   static get Instance () {
diff --git a/server/middlewares/cache/shared/api-cache.ts b/server/middlewares/cache/shared/api-cache.ts
index f8846dcfc..86c5095b5 100644
--- a/server/middlewares/cache/shared/api-cache.ts
+++ b/server/middlewares/cache/shared/api-cache.ts
@@ -7,6 +7,7 @@ import { isTestInstance, parseDurationToMs } from '@server/helpers/core-utils'
 import { logger } from '@server/helpers/logger'
 import { Redis } from '@server/lib/redis'
 import { HttpStatusCode } from '@shared/models'
+import { asyncMiddleware } from '@server/middlewares'
 
 export interface APICacheOptions {
   headerBlacklist?: string[]
@@ -40,24 +41,25 @@ export class ApiCache {
   buildMiddleware (strDuration: string) {
     const duration = parseDurationToMs(strDuration)
 
-    return (req: express.Request, res: express.Response, next: express.NextFunction) => {
-      const key = Redis.Instance.getPrefix() + 'api-cache-' + req.originalUrl
-      const redis = Redis.Instance.getClient()
+    return asyncMiddleware(
+      async (req: express.Request, res: express.Response, next: express.NextFunction) => {
+        const key = Redis.Instance.getPrefix() + 'api-cache-' + req.originalUrl
+        const redis = Redis.Instance.getClient()
 
-      if (!redis.connected) return this.makeResponseCacheable(res, next, key, duration)
+        if (!Redis.Instance.isConnected()) return this.makeResponseCacheable(res, next, key, duration)
 
-      try {
-        redis.hgetall(key, (err, obj) => {
-          if (!err && obj && obj.response) {
+        try {
+          const obj = await redis.hGetAll(key)
+          if (obj?.response) {
             return this.sendCachedResponse(req, res, JSON.parse(obj.response), duration)
           }
 
           return this.makeResponseCacheable(res, next, key, duration)
-        })
-      } catch (err) {
-        return this.makeResponseCacheable(res, next, key, duration)
+        } catch (err) {
+          return this.makeResponseCacheable(res, next, key, duration)
+        }
       }
-    }
+    )
   }
 
   private shouldCacheResponse (response: express.Response) {
@@ -93,21 +95,22 @@ export class ApiCache {
     } as CacheObject
   }
 
-  private cacheResponse (key: string, value: object, duration: number) {
+  private async cacheResponse (key: string, value: object, duration: number) {
     const redis = Redis.Instance.getClient()
 
-    if (redis.connected) {
-      try {
-        redis.hset(key, 'response', JSON.stringify(value))
-        redis.hset(key, 'duration', duration + '')
+    if (Redis.Instance.isConnected()) {
+      await Promise.all([
+        redis.hSet(key, 'response', JSON.stringify(value)),
+        redis.hSet(key, 'duration', duration + ''),
         redis.expire(key, duration / 1000)
-      } catch (err) {
-        logger.error('Cannot set cache in redis.', { err })
-      }
+      ])
     }
 
     // add automatic cache clearing from duration, includes max limit on setTimeout
-    this.timers[key] = setTimeout(() => this.clear(key), Math.min(duration, 2147483647))
+    this.timers[key] = setTimeout(() => {
+      this.clear(key)
+        .catch(err => logger.error('Cannot clear Redis key %s.', key, { err }))
+    }, Math.min(duration, 2147483647))
   }
 
   private accumulateContent (res: express.Response, content: any) {
@@ -184,6 +187,7 @@ export class ApiCache {
             encoding
           )
           self.cacheResponse(key, cacheObject, duration)
+            .catch(err => logger.error('Cannot cache response', { err }))
         }
       }
 
@@ -235,7 +239,7 @@ export class ApiCache {
     return response.end(data, cacheObject.encoding)
   }
 
-  private clear (target: string) {
+  private async clear (target: string) {
     const redis = Redis.Instance.getClient()
 
     if (target) {
@@ -243,7 +247,7 @@ export class ApiCache {
       delete this.timers[target]
 
       try {
-        redis.del(target)
+        await redis.del(target)
       } catch (err) {
         logger.error('Cannot delete %s in redis cache.', target, { err })
       }
@@ -255,7 +259,7 @@ export class ApiCache {
         delete this.timers[key]
 
         try {
-          redis.del(key)
+          await redis.del(key)
         } catch (err) {
           logger.error('Cannot delete %s in redis cache.', key, { err })
         }