feat(job): add removeChildDependency method

docs/gitbook/SUMMARY.md

@@ -41,6 +41,7 @@
   * [Fail Parent](guide/flows/fail-parent.md)
   * [Remove Dependency](guide/flows/remove-dependency.md)
   * [Ignore Dependency](guide/flows/ignore-dependency.md)
+  * [Remove Child Dependency](guide/flows/remove-child-dependency.md)
 * [Metrics](guide/metrics/metrics.md)
 * [Rate limiting](guide/rate-limiting.md)
 * [Retrying failing jobs](guide/retrying-failing-jobs.md)

docs/gitbook/guide/flows/remove-child-dependency.md

@@ -0,0 +1,31 @@
+# Remove Child Dependency
+
+In some situations, you may have a parent job and need to remove the dependency of one of its children.
+
+The pattern to solve this requirement consists on using the **removeChildDependency** method. It will make sure that if the job is the last pending child, to move its parent to _waiting_ and it won't be listed in unprocessed list of the parent.
+
+```typescript
+const flow = new FlowProducer({ connection });
+
+const originalTree = await flow.add({
+  name: 'root-job',
+  queueName: 'topQueueName',
+  data: {},
+  children: [
+    {
+      name,
+      data: { idx: 0, foo: 'bar' },
+      queueName: 'childrenQueueName',
+      opts: {},
+    },
+  ],
+});
+
+await originalTree.children[0].job.removeChildDependency();
+```
+
+{% hint style="waring" %}
+As soon as a **child** calls this method, it will verify if it has an existing parent, if not, it'll throw an error.
+{% endhint %}
+
+Failed or completed children using this option won't generate any removal as they won't be part of unprocessed list:

src/classes/job.ts

@@ -522,6 +522,25 @@ export class Job<
     return Job.addJobLog(this.queue, this.id, logRow, this.opts.keepLogs);
   }
 
+  /**
+   * Removes child dependency from parent when child is not yet finished
+   *
+   * @returns True if the relationship existed and if it was removed.
+   */
+  async removeChildDependency(): Promise<boolean> {
+    const childDependencyIsRemoved = await this.scripts.removeChildDependency(
+      this.id,
+      this.parentKey,
+    );
+    if (childDependencyIsRemoved) {
+      this.parent = undefined;
+      this.parentKey = undefined;
+      return true;
+    }
+
+    return false;
+  }
+
   /**
    * Clears job's logs
    *
@@ -704,7 +723,12 @@ export class Job<
 
     const code = results[results.length - 1][1] as number;
     if (code < 0) {
-      throw this.scripts.finishedErrors(code, this.id, command, 'active');
+      throw this.scripts.finishedErrors({
+        code,
+        jobId: this.id,
+        command,
+        state: 'active',
+      });
     }
 
     if (finishedOn && typeof finishedOn === 'number') {

src/classes/scripts.ts

@@ -216,7 +216,11 @@ export class Scripts {
     }
 
     if (<number>result < 0) {
-      throw this.finishedErrors(<number>result, parentOpts.parentKey, 'addJob');
+      throw this.finishedErrors({
+        code: <number>result,
+        parentKey: parentOpts.parentKey,
+        command: 'addJob',
+      });
     }
 
     return <string>result;
@@ -314,7 +318,11 @@ export class Scripts {
     const result = await (<any>client).updateData(keys.concat([dataJson]));
 
     if (result < 0) {
-      throw this.finishedErrors(result, job.id, 'updateData');
+      throw this.finishedErrors({
+        code: result,
+        jobId: job.id,
+        command: 'updateData',
+      });
     }
   }
 
@@ -336,7 +344,11 @@ export class Scripts {
     );
 
     if (result < 0) {
-      throw this.finishedErrors(result, jobId, 'updateProgress');
+      throw this.finishedErrors({
+        code: result,
+        jobId,
+        command: 'updateProgress',
+      });
     }
   }
 
@@ -414,20 +426,32 @@ export class Scripts {
 
     const result = await (<any>client).moveToFinished(args);
     if (result < 0) {
-      throw this.finishedErrors(result, jobId, 'moveToFinished', 'active');
+      throw this.finishedErrors({
+        code: result,
+        jobId,
+        command: 'moveToFinished',
+        state: 'active',
+      });
     } else {
       if (typeof result !== 'undefined') {
         return raw2NextJobData(result);
       }
     }
   }
 
-  finishedErrors(
-    code: number,
-    jobId: string,
-    command: string,
-    state?: string,
-  ): Error {
+  finishedErrors({
+    code,
+    jobId,
+    parentKey,
+    command,
+    state,
+  }: {
+    code: number;
+    jobId?: string;
+    parentKey?: string;
+    command: string;
+    state?: string;
+  }): Error {
     switch (code) {
       case ErrorCode.JobNotExist:
         return new Error(`Missing key for job ${jobId}. ${command}`);
@@ -440,14 +464,14 @@ export class Scripts {
       case ErrorCode.JobPendingDependencies:
         return new Error(`Job ${jobId} has pending dependencies. ${command}`);
       case ErrorCode.ParentJobNotExist:
-        return new Error(`Missing key for parent job ${jobId}. ${command}`);
+        return new Error(`Missing key for parent job ${parentKey}. ${command}`);
       case ErrorCode.JobLockMismatch:
         return new Error(
           `Lock mismatch for job ${jobId}. Cmd ${command} from ${state}`,
         );
       case ErrorCode.ParentJobCannotBeReplaced:
         return new Error(
-          `The parent job ${jobId} cannot be replaced. ${command}`,
+          `The parent job ${parentKey} cannot be replaced. ${command}`,
         );
       default:
         return new Error(`Unknown code ${code} error for ${jobId}. ${command}`);
@@ -476,6 +500,43 @@ export class Scripts {
     return (<any>client).drain(args);
   }
 
+  private removeChildDependencyArgs(
+    jobId: string,
+    parentKey: string,
+  ): (string | number)[] {
+    const queueKeys = this.queue.keys;
+
+    const keys: string[] = [queueKeys['']];
+
+    const args = [this.queue.toKey(jobId), parentKey];
+
+    return keys.concat(args);
+  }
+
+  async removeChildDependency(
+    jobId: string,
+    parentKey: string,
+  ): Promise<boolean> {
+    const client = await this.queue.client;
+    const args = this.removeChildDependencyArgs(jobId, parentKey);
+
+    const result = await (<any>client).removeChildDependency(args);
+
+    switch (result) {
+      case 0:
+        return true;
+      case 1:
+        return false;
+      default:
+        throw this.finishedErrors({
+          code: result,
+          jobId,
+          parentKey,
+          command: 'removeChildDependency',
+        });
+    }
+  }
+
   private getRangesArgs(
     types: JobType[],
     start: number,
@@ -609,7 +670,12 @@ export class Scripts {
     const args = this.changeDelayArgs(jobId, delay);
     const result = await (<any>client).changeDelay(args);
     if (result < 0) {
-      throw this.finishedErrors(result, jobId, 'changeDelay', 'delayed');
+      throw this.finishedErrors({
+        code: result,
+        jobId,
+        command: 'changeDelay',
+        state: 'delayed',
+      });
     }
   }
 
@@ -652,7 +718,11 @@ export class Scripts {
     const args = this.changePriorityArgs(jobId, priority, lifo);
     const result = await (<any>client).changePriority(args);
     if (result < 0) {
-      throw this.finishedErrors(result, jobId, 'changePriority');
+      throw this.finishedErrors({
+        code: result,
+        jobId,
+        command: 'changePriority',
+      });
     }
   }
 
@@ -766,7 +836,12 @@ export class Scripts {
     const args = this.moveToDelayedArgs(jobId, timestamp, token, delay, opts);
     const result = await (<any>client).moveToDelayed(args);
     if (result < 0) {
-      throw this.finishedErrors(result, jobId, 'moveToDelayed', 'active');
+      throw this.finishedErrors({
+        code: result,
+        jobId,
+        command: 'moveToDelayed',
+        state: 'active',
+      });
     }
   }
 
@@ -797,12 +872,12 @@ export class Scripts {
       case 1:
         return false;
       default:
-        throw this.finishedErrors(
-          result,
+        throw this.finishedErrors({
+          code: result,
           jobId,
-          'moveToWaitingChildren',
-          'active',
-        );
+          command: 'moveToWaitingChildren',
+          state: 'active',
+        });
     }
   }
 
@@ -939,7 +1014,12 @@ export class Scripts {
       case 1:
         return;
       default:
-        throw this.finishedErrors(result, job.id, 'reprocessJob', state);
+        throw this.finishedErrors({
+          code: result,
+          jobId: job.id,
+          command: 'reprocessJob',
+          state,
+        });
     }
   }
 
@@ -997,7 +1077,12 @@ export class Scripts {
 
     const code = await (<any>client).promote(keys.concat(args));
     if (code < 0) {
-      throw this.finishedErrors(code, jobId, 'promote', 'delayed');
+      throw this.finishedErrors({
+        code,
+        jobId,
+        command: 'promote',
+        state: 'delayed',
+      });
     }
   }
 

src/commands/includes/removeParentDependencyKey.lua

@@ -46,6 +46,7 @@ local function removeParentDependencyKey(jobKey, hard, parentKey, baseKey)
           end
         end
       end
+      return true
     end
   else
     local missedParentKey = rcall("HGET", jobKey, "parentKey")
@@ -74,7 +75,9 @@ local function removeParentDependencyKey(jobKey, hard, parentKey, baseKey)
             end
           end
         end
+        return true
       end
     end
   end
+  return false
 end

src/commands/removeChildDependency-1.lua

@@ -0,0 +1,34 @@
+--[[
+  Break parent-child dependency by removing
+  child reference from parent
+
+  Input:
+    KEYS[1] 'key' prefix,
+
+    ARGV[1] job key
+    ARGV[2] parent key
+
+    Output:
+       0  - OK
+       1  - There is not relationship.
+      -1  - Missing job key
+      -5  - Missing parent key
+]]
+local rcall = redis.call
+local jobKey = ARGV[1]
+local parentKey = ARGV[2]
+
+-- Includes
+--- @include "includes/removeParentDependencyKey"
+
+if rcall("EXISTS", jobKey) ~= 1 then return -1 end
+
+if rcall("EXISTS", parentKey) ~= 1 then return -5 end
+
+if removeParentDependencyKey(jobKey, false, parentKey, KEYS[1]) then
+  rcall("HDEL", jobKey, "parentKey", "parent")
+
+  return 0
+else
+  return 1
+end