fix(db): under mac and linux using alternative pool mechanism

this must fix test brokeup and closing stub

src/background/mysql.js

@@ -113,14 +113,70 @@ const expand = (sphinx) => {
 	return sphinx
 }
 
-const pool = () => {
+const pool = async () => {
+	if(/^win/.test(process.platform))
+	{
+		logT('sql', 'using main pool mechanism')
 		let sphinx = mysql.createPool({
 			// bug under mac with some problems on big connection size, limit this to very low value on mac os x
 			connectionLimit: process.platform === 'darwin' ? 3 : config.sphinx.connectionLimit,
 			host     : config.sphinx.host,
 			port     : config.sphinx.port
 		});
-	return expand(sphinx)
+		sphinx = expand(sphinx)
+		const end = sphinx.end.bind(sphinx)
+		sphinx.end = async (cb) => new Promise(resolve => end(() => {
+			resolve()
+			if(cb) cb()
+		}))
+		return sphinx
+	}
+	else
+	{
+		logT('sql', 'using alternative pool mechanism')
+		let connectionPool = []
+		let connectionsLimit = config.sphinx.connectionLimit
+		let currentConnection = 0
+		for(let i = 0; i < connectionsLimit; i++)
+		{
+			connectionPool[i] = await single().waitConnection()	
+		}
+		const buildPoolMethod = (name, ...args) => {
+			if(!connectionPool)
+				return
+			
+			const data = connectionPool[currentConnection][name](...args)
+			currentConnection = (currentConnection + 1) % connectionsLimit
+			return data
+		}
+		return new Proxy({
+			query(...args) {
+				return buildPoolMethod('query', ...args)
+			},
+			insertValues(...args) {
+				return buildPoolMethod('insertValues', ...args)
+			},
+			updateValues(...args) {
+				return buildPoolMethod('updateValues', ...args)
+			},
+			async end(cb)
+			{
+				await Promise.all(connectionPool.map(conn => new Promise(resolve => conn.end(resolve))))
+				if(cb)
+					cb()
+				connectionPool = null
+			}
+		}, {
+			get(target, prop)
+			{
+				if(!target[prop])
+				{
+					return connectionPool[0][prop]
+				}
+				return target[prop]
+			}
+		})
+	}
 }
 
 const single = (callback) => {

src/background/spider.js

@@ -45,7 +45,7 @@ module.exports = function (send, recive, dataDirectory, version, env)
 		let filesId = 1;
 
 		const events = new EventEmitter
-		let sphinx = pool();
+		let sphinx = await pool();
 
 		// initialize p2p
 		const p2p = new P2PServer(send)

tests/bigtableapi.test.js

@@ -8,8 +8,8 @@ const forBigTable = require('../src/background/forBigTable')
 describe("big table for check", () => {
 	let sphinx;
 
-	it("init", function() {
-		sphinx = pool()
+	it("init", async function() {
+		sphinx = await pool()
 		expect(sphinx)
 	})
 
@@ -36,4 +36,8 @@ describe("big table for check", () => {
 		await forBigTable(sphinx, 'feed', record => records.push(record), null, 15)
 		expect(records.length === 13)
 	})
+
+	it("close", async function() {
+		await sphinx.end()
+	})
 });

tests/init.js

@@ -1,4 +1,5 @@
 import {startApplication, stopApplication} from "../tests/application";
+global.logT = (...args) => {console.log(...args)}
 
 describe("application", () => {
 	before(startApplication);

tests/sphinx.test.js

@@ -1,4 +1,4 @@
-import { expect } from "chai";
+import { expect, assert } from "chai";
 
 const mysql = require('mysql')
 const config = require('../src/background/config')
@@ -61,14 +61,28 @@ describe("sphinx", () => {
 	})
 
 	it("query limit", function(done) {
-		const sphinx = pool()
+		const test = async () => {
+			const sphinx = await pool()
 			let promises = []
 			sphinx.query(`delete from feed where id >= 0`, () => {
 				for(let i = 0; i < 500; i++)
 					promises.push(sphinx.query(`insert into feed(id, data) values(${i}, 'a')`))
 				Promise.all(promises).then(() => {
-				sphinx.query(`delete from feed where id >= 0`, () => done())    
+					sphinx.query(`delete from feed where id >= 0`, async () => { 
+						await sphinx.end()
+						done() 
 					}) 
 				})
 			})
+		}
+		test()
+	})
+
+	it("escape", function () {
+		assert.equal(sphinx.escape(`naru'to`), `'naru\\'to'`)
+	})
+
+	it("close pool", function(done) {
+		sphinx.end(done)
+	})
 });