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Message Distribution Microservice

This microservice is distributes messages to one or many recipients using their configured delivery methods: email or sms.

The microservice currently supports the following deployment options:

  • Deployment platforms: Standalone Process, Seneca
  • External APIs: HTTP/REST, Seneca

This microservice has optional dependencies on the following microservices:

Quick Links:


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 MessageV1 {
  String template;
  String from;
  String cc;
  String bcc;
  String reply_to;
  var subject;
  var text;
  var html;

abstract class IMessageDistributionV1 {
  Future sendMessage(String? correlationId, RecipientV1 recipient,
      MessageV1 message, ConfigParams parameters, String method);

  Future sendMessages(String? correlationId, List<RecipientV1> recipients,
      MessageV1 message, ConfigParams parameters, String method);

  Future sendMessageToRecipient(
      String? correlationId,
      String recipientId,
      String subscription,
      MessageV1 message,
      ConfigParams parameters,
      String method);

  Future sendMessageToRecipients(
      String? correlationId,
      List<String> recipientIds,
      String subscription,
      MessageV1 message,
      ConfigParams parameters,
      String method);

Message can be defined directly or loaded from message template (stored in msgtemplates service);

When message is set directly its subject, text and html content can be set by handlebars template, that it processed using parameters set. Here is an example:

Dear {{ name }},
Please, help us to verify your email address. Your verification code is {{ code }}.
Click on the 
<a href="{{ clientUrl }}/#/verify_email?server_url={{ serverUrl }}&email={{ email }}&code={{ code }}">link</a>
to complete verification procedure
{{ signature }}


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-users/pip-services-msgdistribution-dart.git

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


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-msgdistribution:controller:default:default:1.0"
- descriptor: "pip-services-msgdistribution:service:http:default:1.0"
    protocol: "http"
    host: ""
    port: 8080

For more information on the microservice configuration see Configuration Guide.

For more information on the microservice configuration see Configuration Guide.

Start the microservice using the command:

dart ./bin/run.dart


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 dart, then get references to the required libraries:

Add pip-services3-commons-dart, pip-services3-rpc-dart and pip-services_msgdistribution packages

import 'package:pip_services3_commons/pip_services3_commons.dart';
import 'package:pip_services3_rpc/pip_services3_rpc.dart';

import 'package:pip_services_msgdistribution/pip_services_msgdistribution.dart';

Instantiate the client and open connection to the microservice

// Create the client instance
var client = MessageDistributionHttpClientV1(config);

// Configure the client

// Connect to the microservice
  await client.open(null)
}catch() {
  // Error handling...
// Work with the microservice
// ...

Now the client is ready to perform operations

// Send email message to users
var recipient1 = RecipientV1(id: '1', email: 'user1@somewhere.com', phone: '+1234567890');
var recipient2 = RecipientV1(id: '2', email: 'user2@somewhere.com', phone: '+0987654321');
var message = MessageV1(subject: 'Test', 
                             text: 'This is a test message. Please, ignore it');
await client.sendMessages(


This microservice was created and currently maintained by

  • Sergey Seroukhov
  • Nuzhnykh Egor.