112 lines
3.0 KiB
JavaScript
112 lines
3.0 KiB
JavaScript
const shajs = require('sha.js');
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const fs = require('fs-extra');
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const Exporter = require('./exporter');
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module.exports = class ExporterEngine {
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constructor(conn, mytDir) {
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this.conn = conn;
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this.pullFile = `${mytDir}/.pullinfo.json`;
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this.exporters = [];
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this.exporterMap = {};
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}
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async init () {
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if (await fs.pathExists(this.pullFile)) {
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this.pullInfo = JSON.parse(await fs.readFile(this.pullFile, 'utf8'));
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const lastPull = this.pullInfo.lastPull;
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if (lastPull)
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this.pullInfo.lastPull = new Date(lastPull);
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} else
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this.pullInfo = {
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lastPull: null,
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shaSums: {}
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};
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this.shaSums = this.pullInfo.shaSums;
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this.lastPull = this.pullInfo.lastPull;
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this.infoChanged = false;
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const types = [
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'function',
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'procedure',
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'view',
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'trigger',
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'event'
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];
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for (const type of types) {
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const exporter = new Exporter(type);
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await exporter.init();
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this.exporters.push(exporter);
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this.exporterMap[type] = exporter;
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}
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}
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async fetchRoutine(type, schema, name) {
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const exporter = this.exporterMap[type];
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const [row] = await exporter.query(this.conn, schema, name);
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return row && exporter.format(row);
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}
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async fetchShaSum(type, schema, name) {
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const sql = await this.fetchRoutine(type, schema, name);
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this.setShaSum(type, schema, name, this.shaSum(sql));
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}
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shaSum(sql) {
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if (!sql) return null;
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return shajs('sha256')
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.update(JSON.stringify(sql))
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.digest('hex');
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}
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getShaSum(type, schema, name) {
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try {
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return this.shaSums[schema][type][name];
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} catch (e) {};
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return null;
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}
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setShaSum(type, schema, name, shaSum) {
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if (!shaSum) {
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this.deleteShaSum(type, schema, name);
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return;
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}
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const shaSums = this.shaSums;
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if (!shaSums[schema])
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shaSums[schema] = {};
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if (!shaSums[schema][type])
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shaSums[schema][type] = {};
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shaSums[schema][type][name] = shaSum;
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this.infoChanged = true;
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}
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deleteShaSum(type, schema, name) {
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try {
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delete this.shaSums[schema][type][name];
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this.infoChanged = true;
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} catch (e) {};
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}
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deleteSchemaSums(schema) {
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delete this.shaSums[schema];
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this.infoChanged = true;
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}
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async refreshPullDate() {
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const [[row]] = await this.conn.query(`SELECT NOW() now`);
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this.pullInfo.lastPull = row.now;
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this.infoChanged = true;
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}
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async saveInfo() {
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if (!this.infoChanged) return;
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await fs.writeFile(this.pullFile,
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JSON.stringify(this.pullInfo, null, ' '));
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this.infoChanged = false;
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}
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}
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