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    1.1.1 • Public • Published

    EventLog Microservice

    This is a system event logging microservice from Pip.Services library. It logs important system events like starts and stops of servers, upgrades to a new version, fatal system errors or key business transactions.

    The microservice currently supports the following deployment options:

    • Deployment platforms: Standalone Process, Seneca Plugin
    • External APIs: HTTP/REST, Seneca
    • Persistence: Memory, Flat Files, MongoDB

    This microservice has no dependencies on other 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 SystemEventV1 implements IStringIdentifiable {
        public id: string;
        public time: Date;
        public correlation_id: string;
        public source: string;
        public type: string;
        public severity: EventLogSeverityV1;
        public message: string;
        public details: StringValueMap;
    class EventLogTypeV1
        public static readonly Restart: string = "restart";
        public static readonly Failure: string = "failure";
        public static readonly Warning: string = "warning";
        public static readonly Transaction: string = "transaction";
        public static readonly Other: string = "other";
    enum EventLogSeverityV1
        Critical = 0,
        Important = 500,
        Informational = 1000
    interface IEventLogV1 {
        getEvents(correlationId: string, filter: FilterParams, paging: PagingParams, 
            callback: (err: any, page: DataPage<SystemEventV1>) => void): void;
        logEvent(correlationId: string, event: SystemEventV1, 
            callback?: (err: any, event: SystemEventV1) => void): void;


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

    git clone

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


    Add config.json 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-container:container-info:default:default:1.0"
      name: "pip-services-eventlog"
      description: "EventLog microservice"
    descriptor: "pip-services-commons:logger:console:default:1.0"
      level: "trace"
    descriptor: "pip-services-eventlog:persistence:file:default:1.0"
      path: "./data/eventlog.json"
    descriptor: "pip-services-eventlog:controller:default:default:1.0"
    descriptor: "pip-services-eventlog:service:http:default:1.0"
        protocol: "http"
        host: ""
        port: 8080

    For more information on the microservice configuration see Configuration Guide.

    Start the microservice using the command:

    node run


    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-eventlog-node": "^1.0.*"

    Inside your code get the reference to the client SDK

    var sdk = new require('pip-clients-eventlog-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.EventLogHttpClientV1(config);
    // Connect to the microservice, function(err) {
        if (err) {
            console.error('Connection to the microservice failed');
        // Work with the microservice

    Now the client is ready to perform operations

    // Log system event
            type: 'restart',
            source: 'server1',
            message: 'Restarted server'
        function (err, event) {
    var now = new Date();
    // Get the list system events
            from_time: new Date(now.getTime() - 24 * 3600 * 1000),
            to_time: now,
            source: 'server1'
            total: true,
            skip: 0, 
            take: 10  
        function(err, page) {


    This microservice was created and currently maintained by Sergey Seroukhov.


    npm i pip-services-eventlog-node

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