unleash.unleash/lib/db/event-store.js

'use strict';

const { EventEmitter } = require('events');

const EVENT_COLUMNS = ['id', 'type', 'created_by', 'created_at', 'data'];

class EventStore extends EventEmitter {

    constructor (db) {
        super();
        this.db = db;
    }

    store (event) {
        return this.db('events').insert({
            type: event.type,
            created_by: event.createdBy, // eslint-disable-line
            data: event.data,
        })
        .then(() => this.emit(event.type, event));
    }

    getEvents () {
        return this.db
            .select(EVENT_COLUMNS)
            .from('events')
            .limit(100)
            .orderBy('created_at', 'desc')
            .map(this.rowToEvent);
    }

    getEventsFilterByName (name) {
        return this.db
        .select(EVENT_COLUMNS)
        .from('events')
        .limit(100)
        .whereRaw('data ->> \'name\' = ?', [name])
        .orderBy('created_at', 'desc')
        .map(this.rowToEvent);
    }

    rowToEvent (row) {
        return {
            id: row.id,
            type: row.type,
            createdBy: row.created_by,
            createdAt: row.created_at,
            data: row.data,
        };
    }
};

module.exports = EventStore;