Announcements Microservice

This is a system announcements microservice from Pip.Services library. It allows system administrators and product owners to communicate to users key system events and product updates. Each announcement:

• Can be written in multiple languages
• Can include pictures and document attachments
• Supports editing lifecycle via status tracking

The microservice currently supports the following deployment options:

• Deployment platforms: Standalone Process, Seneca
• External APIs: HTTP/REST, Seneca, AWS Lambda
• Persistence: In-Memory, Flat Files, MongoDB

This microservice has dependencies on the following microservices:

• pip-services-attachments - to reference pictures and documents associates with announcements

Quick Links:

• Download Links
• Development Guide
• Configuration Guide
• Deployment Guide
• Client SDKs
  • Node.js SDK
• Communication Protocols
  • HTTP Version 1
  • Seneca Version 1

Contract

Logical contract of the microservice is presented below. For physical implementation (HTTP/REST, Thrift, Seneca, Lambda, etc.), please, refer to documentation of the specific protocol.

class AnnouncementV1 implements IStringIdentifiable {
    /* Identification */
    public id: string;
    public category: string;
    public app?: string;

    /* Automatically managed fields */
    public creator: PartyReferenceV1;
    public create_time: Date;

    /* Content */
    public title?: MultiString;
    public content?: MultiString;
    public location?: LocationV1;
    public start_time?: Date;
    public end_time?: Date;
    public pic_ids?: string[];
    public docs?: AttachmentV1[];

    /* Search */
    public tags?: string[];
    public all_tags?: string[];

    /* Status */
    public status?: string;
    public importance?: number;

    /* Custom fields */
    public custom_hdr?: any;
    public custom_dat?: any;
}

class AttachmentV1 implements IStringIdentifiable {
    public id: string;
    public name?: string;
}

class PartyReferenceV1 implements IStringIdentifiable {
    public id: string;
    public name?: string;
    public email?: string;
}

class LocationV1 {
    public name: string;
    public pos?: any;
}

class AnnouncementStatusV1 {
    public static readonly New = "new";
    public static readonly Writing = "writing";
    public static readonly Translating = "translating";
    public static readonly Verifying = "verifying";
    public static readonly Completed = "completed";
}

interface IAnnouncementsV1 {
    getAnnouncements(correlationId: string, filter: FilterParams, paging: PagingParams,
        callback: (err: any, page: DataPage<AnnouncementV1>) => void): void;

    getRandomAnnouncement(correlationId: string, filter: FilterParams,
        callback: (err: any, announcement: AnnouncementV1) => void): void;

    getAnnouncementById(correlationId: string, announcementId: string,
        callback: (err: any, announcement: AnnouncementV1) => void): void;

    createAnnouncement(correlationId: string, announcement: AnnouncementV1,
        callback: (err: any, announcement: AnnouncementV1) => void): void;

    updateAnnouncement(correlationId: string, announcement: AnnouncementV1,
        callback: (err: any, announcement: AnnouncementV1) => void): void;

    deleteAnnouncementById(correlationId: string, announcementId: string,
        callback: (err: any, announcement: AnnouncementV1) => void): void;
}

Download

Right now the only way to get the microservice is to check it out directly from github repository

git clone git@github.com:pip-services-support/pip-services-announcements-node.git

Pip.Service team is working to implement packaging and make stable releases available for your as zip downloadable archieves.

Run

Add config.yml file to the root of the microservice folder and set configuration parameters. As the starting point you can use example configuration from config.example.yml file.

Example of microservice configuration

---
- descriptor: "pip-services-commons:logger:console:default:1.0"
  level: "trace"

- descriptor: "pip-services-announcements:persistence:file:default:1.0"
  path: "./data/announcements.json"

- descriptor: "pip-services-announcements:controller:default:default:1.0"

- descriptor: "pip-services-attachments:client:http:default:1.0"
  connection:
    protocol: "http"
    host: "0.0.0.0"
    port: 8082

- descriptor: "pip-services-announcements:service:http:default:1.0"
  connection:
    protocol: "http"
    host: "0.0.0.0"
    port: 8080

For more information on the microservice configuration see Configuration Guide.

Start the microservice using the command:

node run

Use

The easiest way to work with the microservice is to use client SDK. The complete list of available client SDKs for different languages is listed in the Quick Links

If you use Node.js then you should add dependency to the client SDK into package.json file of your project

{
    ...
    "dependencies": {
        ....
        "pip-clients-announcements-node": "^1.0.*",
        ...
    }
}

Inside your code get the reference to the client SDK

var sdk = new require('pip-clients-announcements-node');

Define client configuration parameters that match configuration of the microservice external API

// Client configuration
var config = {
    connection: {
        protocol: 'http',
        host: 'localhost', 
        port: 8080
    }
};

Instantiate the client and open connection to the microservice

// Create the client instance
var client = sdk.AnnouncementsHttpClientV1(config);

// Connect to the microservice
client.open(null, function(err) {
    if (err) {
        console.error('Connection to the microservice failed');
        console.error(err);
        return;
    }
    
    // Work with the microservice
    ...
});

Now the client is ready to perform operations

// Create a new announcement
client.createAnnouncement(
    null,
    { 
        category: 'maintenance',
        title: { en: 'Maintenance on Jan 01' },
        content: { en: 'Our servers will be shutdown for maintenance on Jan 01' }
    },
    function (err, announcement) {
        ...
    }
);

// Get a random announcement
client.getRandomAnnouncement(
    null,
    {},
    function(err, announcement) {
        ...    
    }
);

Acknowledgements

This microservice was created and currently maintained by Sergey Seroukhov.