Job Status Update: Implement RabbitMQ Action

src/config/configuration.ts

@@ -7,6 +7,7 @@ import {
 import { LogJobAction } from "../jobs/actions/logaction";
 import { EmailJobAction } from "../jobs/actions/emailaction";
 import { URLAction } from "src/jobs/actions/urlaction";
+import { RabbitMQJobAction } from "src/jobs/actions/rabbitmqaction";
 import * as fs from "fs";
 import { merge } from "lodash";
 import localconfiguration from "./localconfiguration";
@@ -237,9 +238,11 @@ export function registerDefaultActions() {
   registerCreateAction(LogJobAction);
   registerCreateAction(EmailJobAction);
   registerCreateAction(URLAction);
+  registerCreateAction(RabbitMQJobAction);
   // Status Update
   registerStatusUpdateAction(LogJobAction);
   registerStatusUpdateAction(EmailJobAction);
+  registerStatusUpdateAction(RabbitMQJobAction);
 }
 
 export type OidcConfig = ReturnType<typeof configuration>["oidc"];

src/jobs/actions/logaction.ts

@@ -15,11 +15,11 @@ export class LogJobAction<T> implements JobAction<T> {
   }
 
   async validate(dto: T) {
-    Logger.log("Validating CREATE job: " + JSON.stringify(dto), "LogJobAction");
+    Logger.log("Validating job: " + JSON.stringify(dto), "LogJobAction");
   }
 
   async performJob(job: JobClass) {
-    Logger.log("Performing CREATE job: " + JSON.stringify(job), "LogJobAction");
+    Logger.log("Performing job: " + JSON.stringify(job), "LogJobAction");
   }
 
   constructor(data: Record<string, any>) {

src/jobs/actions/rabbitmqaction.ts

@@ -0,0 +1,91 @@
+import { Logger, NotFoundException } from "@nestjs/common";
+import amqp, { Connection } from "amqplib/callback_api";
+import { JobAction } from "../config/jobconfig";
+import { JobClass } from "../schemas/job.schema";
+
+
+/**
+ * Publish a message in a RabbitMQ queue
+ */
+export class RabbitMQJobAction<T> implements JobAction<T> {
+  public static readonly actionType = "rabbitmq";
+  private connection;
+  private binding;
+
+  constructor(data: Record<string, any>) {
+    Logger.log(
+      "Initializing RabbitMQJobAction. Params: " + JSON.stringify(data),
+      "RabbitMQJobAction",
+    );
+
+    this.connection = {
+      protocol: "amqp",
+      hostname: data.hostname,
+      port: data.port,
+      username: data.username,
+      password: data.password,
+    };
+    this.binding = {
+      exchange: data.exchange,
+      queue: data.queue,
+      key: data.key
+    };
+  }
+
+  getActionType(): string {
+    return RabbitMQJobAction.actionType;
+  }
+
+  async validate(dto: T) {
+    Logger.log(
+      "Validating RabbitMQJobAction: " + JSON.stringify(dto),
+      "RabbitMQJobAction",
+    );
+
+    const connectionDetailsMissing = [undefined, ""].some(el => Object.values(this.connection).includes(el));
+    if (connectionDetailsMissing) {
+      throw new NotFoundException("RabbitMQ configuration is missing connection details.");
+    }
+
+    const bindingDetailsMissing = [undefined, ""].some(el => Object.values(this.binding).includes(el));
+    if (bindingDetailsMissing) {
+      throw new NotFoundException("RabbitMQ binding is missing exchange/queue/key details.");
+    }
+  }
+
+  async performJob(job: JobClass) {
+    Logger.log(
+      "Performing RabbitMQJobAction: " + JSON.stringify(job),
+      "RabbitMQJobAction",
+    );
+
+    amqp.connect(this.connection, (connectionError: Error, connection: Connection) => {
+      if (connectionError) {
+        Logger.error(
+          "Connection error in RabbitMQJobAction: " + JSON.stringify(connectionError.message),
+          "RabbitMQJobAction",
+        );
+        return;
+      }
+
+      connection.createChannel((channelError: Error, channel) => {
+        if (channelError) {
+          Logger.error(
+            "Channel error in RabbitMQJobAction: " + JSON.stringify(channelError.message),
+            "RabbitMQJobAction",
+          );
+          return;
+        }
+
+        channel.assertQueue(this.binding.queue, { durable: true });
+        channel.assertExchange(this.binding.exchange, "topic", { durable: true });
+        channel.bindQueue(this.binding.queue, this.binding.exchange, this.binding.key);
+        channel.sendToQueue(this.binding.queue, Buffer.from(JSON.stringify(job)));
+
+        channel.close(() => {
+          connection.close();
+        });
+      });
+    });
+  }
+}

src/jobs/config/jobConfig.example.json

@@ -15,11 +15,33 @@
             "headers": {
               "accept": "application/json"
             }
+          },
+          {
+            "actionType": "rabbitmq",
+            "hostname": "rabbitmq",
+            "port": 5672,
+            "username": "guest",
+            "password": "guest",
+            "exchange": "jobs.write",
+            "queue": "client.jobs.write",
+            "key": "jobqueue"
           }
         ]
       },
       "statusUpdate": {
-        "auth": "archivemanager"
+        "auth": "archivemanager",
+        "actions": [
+          {
+            "actionType": "rabbitmq",
+            "hostname": "rabbitmq",
+            "port": 5672,
+            "username": "guest",
+            "password": "guest",
+            "exchange": "jobs.write",
+            "queue": "client.jobs.write",
+            "key": "jobqueue"
+          }
+        ]
       }
     },
     {

src/jobs/config/jobconfig.ts

@@ -24,14 +24,15 @@ import { CreateJobAuth, JobsAuth } from "../types/jobs-auth.enum";
 import Ajv from "ajv";
 import { JobConfigSchema } from "./jobConfig.schema";
 
+
 /**
  * Encapsulates all responses to a particular job type (eg "archive")
  */
 export class JobConfig {
   jobType: string;
   configVersion: string;
   create: JobOperation<CreateJobDto>;
-  // read: JobReadAction[];
+  // read: JobOperation<ReadJobDto>;
   statusUpdate: JobOperation<StatusUpdateJobDto>;
 
   constructor(
@@ -54,23 +55,27 @@ export class JobConfig {
    * @returns
    */
   static parse(
-    data: Record<string, any>,
+    jobData: Record<string, any>,
     configVersion: string
   ): JobConfig {
-    const type = data[JobsConfigSchema.JobType];
+    const type = jobData[JobsConfigSchema.JobType];
     const create = JobOperation.parse<CreateJobDto>(
       createActions,
-      data[AuthOp.Create],
+      jobData[AuthOp.Create],
     );
-    const read = undefined;  // "read" in data ? oneOrMore(data["read"]).map((json) => parseReadAction(json["action"])) : [];
+    const read = undefined;
     const statusUpdate = JobOperation.parse<StatusUpdateJobDto>(
       statusUpdateActions,
-      data[AuthOp.StatusUpdate],
+      jobData[AuthOp.StatusUpdate],
     );
     return new JobConfig(type, configVersion, create, read, statusUpdate);
   }
 }
 
+
+/**
+ * Encapsulates all information for a particular job operation (eg "create", "statusUpdate")
+ */
 export class JobOperation<DtoType> {
   auth: JobsAuth | undefined;
   actions: JobAction<DtoType>[];
@@ -98,6 +103,7 @@ export class JobOperation<DtoType> {
   }
 }
 
+
 /**
  * Given a JSON object configuring a JobConfigAction.
  *
@@ -122,6 +128,7 @@ function parseAction<DtoType>(
   return new actionClass(data);
 }
 
+
 /**
  * Superclass for all responses to Job changes
  */
@@ -130,16 +137,20 @@ export interface JobAction<DtoType> {
    * Validate the DTO, throwing an HttpException for problems
    */
   validate: (dto: DtoType) => Promise<void>;
+
   /**
    * Respond to the action
    */
   performJob: (job: JobClass) => Promise<void>;
+
   /**
    * Return the actionType for this action. This should match the class's
    * static actionType (used for constructing the class from the configuration file)
    */
   getActionType(): string;
 }
+
+
 /**
  * Describes the constructor and static members for JobAction implementations
  */
@@ -155,49 +166,48 @@ export type JobCreateAction = JobAction<CreateJobDto>;
 // export type JobReadAction = JobAction<ReadJobDto>;
 export type JobStatusUpdateAction = JobAction<StatusUpdateJobDto>;
 
-/// Action registration
-
-// type JobActionCtor<T> = (json: Record<string,any>) => JobAction<T>;
 
+/**
+ * Action registration
+ */
 const createActions: Record<string, JobActionClass<CreateJobDto>> = {};
-// const readActions: Record<string, JobActionCtor<ReadJobDto>> = {};
+// const readActions: Record<string, JobActionClass<ReadJobDto>> = {};
 const statusUpdateActions: Record<string, JobActionClass<StatusUpdateJobDto>> = {};
 
 /**
  * Registers an action to handle jobs of a particular type
  * @param action
  */
-export function registerCreateAction(action: JobActionClass<CreateJobDto>) {
+export function registerCreateAction(
+  action: JobActionClass<CreateJobDto>
+) {
   createActions[action.actionType] = action;
 }
-/**
- * List of action types with a registered action
- * @returns
- */
-export function getRegisteredCreateActions(): string[] {
-  return Object.keys(createActions);
-}
 
-/**
- * Registers an action to handle jobs of a particular type
- * @param action
- */
 export function registerStatusUpdateAction(
   action: JobActionClass<StatusUpdateJobDto>,
 ) {
   statusUpdateActions[action.actionType] = action;
 }
+
 /**
  * List of action types with a registered action
  * @returns
  */
+export function getRegisteredCreateActions(): string[] {
+  return Object.keys(createActions);
+}
+
 export function getRegisteredStatusUpdateActions(): string[] {
   return Object.keys(statusUpdateActions);
 }
 
-/// Parsing
 
+/**
+ * Parsing
+ */
 let jobConfig: JobConfig[] | null = null; // singleton
+
 /**
  * Load jobconfig.json file.
  * Expects one or more JobConfig configurations (see JobConfig.parse)

src/jobs/interceptors/job-create.interceptor.ts

@@ -78,6 +78,7 @@ export class JobCreateInterceptor implements NestInterceptor {
         });
       }),
     );
+
     return jc;
   }
 }