@watergis/postgis2mbtiles/es6/postgis2mbtiles.js

A module extracting the data from PostGIS to mbtiles by using tippecanoe.

import fs from 'fs';
import { execSync } from 'child_process';
import { postgis2geojson } from '@watergis/postgis2geojson';
class postgis2mbtiles {
    constructor(config) {
        this.config = config;
    }
    run() {
        return new Promise((resolve, reject) => {
            const pg2json = new postgis2geojson(this.config);
            pg2json
                .run()
                .then((geojsonfiles) => {
                return this.createMbtiles(geojsonfiles, this.config.mbtiles);
            })
                .then((file) => {
                resolve(file);
            })
                .catch((err) => {
                reject(err);
            });
        });
    }
    createMbtiles(geojsonfiles, mbtiles) {
        return new Promise((resolve, reject) => {
            try {
                if (fs.existsSync(mbtiles)) {
                    fs.unlinkSync(mbtiles);
                }
                const cmd = `tippecanoe -rg -z${this.config.maxzoom} -Z${this.config.minzoom} --name="${this.config.name}" --description="${this.config.description}" --attribution="${this.config.attribution}" -o ${mbtiles} ${geojsonfiles.join(' ')}`;
                execSync(cmd).toString();
                geojsonfiles.forEach((f) => {
                    fs.unlinkSync(f);
                });
                console.log(`Creating voctor tile was done successfully at ${mbtiles}`);
                resolve(mbtiles);
            }
            catch (err) {
                reject(err);
            }
        });
    }
}
export default postgis2mbtiles;
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