fix(workflow-engine-redis): Split the queues and respect worker mode for job executions (#11740)

**What**
Currently, the workflow engine redis does not make any distinction between worker modes, when starting as server, the engine listen to the queue which contains everything and try to execute the corresponding workflow which does not exists since job workflows are not loaded in server mode. Now, a dedicated queue is created for jobs and the worker is only started if the instance is not in server mode. In order to clean up the old queue, if the old queue trigger a scheduled job then it gets removed from the queue since it will get re added to the new queue by the new worker instances

packages/modules/workflow-engine-redis/src/utils/workflow-orchestrator-storage.ts

@@ -36,37 +36,55 @@ export class RedisDistributedTransactionStorage
   private redisClient: Redis
   private redisWorkerConnection: Redis
   private queueName: string
+  private jobQueueName: string
   private queue: Queue
+  private jobQueue?: Queue
   private worker: Worker
+  private jobWorker?: Worker
+
+  #isWorkerMode: boolean = false
 
   constructor({
     workflowExecutionService,
     redisConnection,
     redisWorkerConnection,
     redisQueueName,
+    redisJobQueueName,
     logger,
+    isWorkerMode,
   }: {
     workflowExecutionService: ModulesSdkTypes.IMedusaInternalService<any>
     redisConnection: Redis
     redisWorkerConnection: Redis
     redisQueueName: string
+    redisJobQueueName: string
     logger: Logger
+    isWorkerMode: boolean
   }) {
     this.workflowExecutionService_ = workflowExecutionService
     this.logger_ = logger
     this.redisClient = redisConnection
     this.redisWorkerConnection = redisWorkerConnection
     this.queueName = redisQueueName
+    this.jobQueueName = redisJobQueueName
     this.queue = new Queue(redisQueueName, { connection: this.redisClient })
+    this.jobQueue = isWorkerMode
+      ? new Queue(redisJobQueueName, {
+          connection: this.redisClient,
+        })
+      : undefined
+    this.#isWorkerMode = isWorkerMode
   }
 
   async onApplicationPrepareShutdown() {
     // Close worker gracefully, i.e. wait for the current jobs to finish
     await this.worker?.close()
+    await this.jobWorker?.close()
   }
 
   async onApplicationShutdown() {
     await this.queue?.close()
+    await this.jobQueue?.close()
   }
 
   async onApplicationStart() {
@@ -76,6 +94,11 @@ export class RedisDistributedTransactionStorage
       JobType.TRANSACTION_TIMEOUT,
     ]
 
+    const workerOptions = {
+      connection:
+        this.redisWorkerConnection /*, runRetryDelay: 100000 for tests */,
+    }
+
     this.worker = new Worker(
       this.queueName,
       async (job) => {
@@ -86,19 +109,26 @@ export class RedisDistributedTransactionStorage
           )
         }
 
-        // Note: We might even want a separate worker with different concurrency settings in the future, but for now we keep it simple
         if (job.name === JobType.SCHEDULE) {
+          // Remove repeatable job from the old queue since now we have a queue dedicated to scheduled jobs
+          await this.remove(job.data.jobId)
+        }
+      },
+      workerOptions
+    )
+
+    if (this.#isWorkerMode) {
+      this.jobWorker = new Worker(
+        this.jobQueueName,
+        async (job) => {
           await this.executeScheduledJob(
             job.data.jobId,
             job.data.schedulerOptions
           )
-        }
-      },
-      {
-        connection:
-          this.redisWorkerConnection /*, runRetryDelay: 100000 for tests */,
-      }
-    )
+        },
+        workerOptions
+      )
+    }
   }
 
   setWorkflowOrchestratorService(workflowOrchestratorService) {
@@ -369,10 +399,18 @@ export class RedisDistributedTransactionStorage
     step?: TransactionStep
   ) {
     const jobId = this.getJobId(type, transaction, step)
-    const job = await this.queue.getJob(jobId)
 
-    if (job && job.attemptsStarted === 0) {
-      await job.remove()
+    if (type === JobType.SCHEDULE) {
+      const job = await this.jobQueue?.getJob(jobId)
+      if (job) {
+        await job.remove()
+      }
+    } else {
+      const job = await this.queue.getJob(jobId)
+
+      if (job && job.attemptsStarted === 0) {
+        await job.remove()
+      }
     }
   }
 
@@ -385,7 +423,7 @@ export class RedisDistributedTransactionStorage
       typeof jobDefinition === "string" ? jobDefinition : jobDefinition.jobId
 
     // If it is the same key (eg. the same workflow name), the old one will get overridden.
-    await this.queue.add(
+    await this.jobQueue?.add(
       JobType.SCHEDULE,
       {
         jobId,
@@ -410,13 +448,13 @@ export class RedisDistributedTransactionStorage
   }
 
   async remove(jobId: string): Promise<void> {
-    await this.queue.removeRepeatableByKey(`${JobType.SCHEDULE}_${jobId}`)
+    await this.jobQueue?.removeRepeatableByKey(`${JobType.SCHEDULE}_${jobId}`)
   }
 
   async removeAll(): Promise<void> {
-    const repeatableJobs = await this.queue.getRepeatableJobs()
+    const repeatableJobs = (await this.jobQueue?.getRepeatableJobs()) ?? []
     await promiseAll(
-      repeatableJobs.map((job) => this.queue.removeRepeatableByKey(job.key))
+      repeatableJobs.map((job) => this.jobQueue?.removeRepeatableByKey(job.key))
     )
   }
 }