machinomy/lib/storage/postgresql/EnginePostgres.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const pg = require("pg");
class EnginePostgres {
    constructor(url) {
        this.url = url;
    }
    async connect() {
        await this.ensureConnection();
    }
    isConnected() {
        return Boolean(this._client);
    }
    async close() {
        if (!this._client) {
            return Promise.resolve();
        }
        await this._client.end();
        this._client = undefined;
    }
    async drop() {
        await this.exec(client => {
            return Promise.all([
                client.query('TRUNCATE channel CASCADE'),
                client.query('TRUNCATE payment CASCADE'),
                client.query('TRUNCATE token CASCADE')
            ]);
        });
    }
    async exec(fn) {
        let client = await this.ensureConnection();
        return fn(client);
    }
    async ensureConnection() {
        if (this._client) {
            return this._client;
        }
        if (this.connectionInProgress) {
            return this.connectionInProgress;
        }
        const connectionString = { connectionString: this.url };
        const client = new pg.Client(connectionString);
        this.connectionInProgress = client.connect().then(() => {
            this._client = client;
            return client;
        });
        return this.connectionInProgress;
    }
}
exports.default = EnginePostgres;
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