I'm trying to connect to a postgres database (Postgresql-11) within my
nodejs-vue.js app, but in console I'm getting this error:
[HMR] Waiting for update signal from WDS...
pg.js?c8c2:27 Unable to connect to the database: TypeError: net.Socket
is not a constructor
at new Connection
(webpack-internal:///./node_modules/pg/lib/connection.js:22:34)
at new Client
(webpack-internal:///./node_modules/pg/lib/client.js:55:37)
at Promise.tap.query
(webpack-internal:///./node_modules/sequelize/lib/dialects/postgres
/connection-manager.js:124:26)
at ConnectionManager.connect
(webpack-internal:///./node_modules/sequelize/lib/dialects
/postgres/connection-manager.js:121:12)
at eval
(webpack-internal:///./node_modules/sequelize/lib/dialects/abstract/connection-
manager.js:318:50)
From previous event:
at ConnectionManager._connect
(webpack-internal:///./node_modules/sequelize/lib/dialects
/abstract/connection-manager.js:318:8)
at ConnectionManager.getConnection
(webpack-internal:///./node_modules/sequelize/lib/dialects
/abstract/connection-manager.js:254:46)
at eval
(webpack-internal:///./node_modules/sequelize/lib/sequelize.js:640:36)
From previous event:
at eval
(webpack-internal:///./node_modules/sequelize/lib/sequelize.js:631:53)
at eval
(webpack-internal:///./node_modules/retry-as-promised/index.js:70:21)
at new Promise (<anonymous>)
at retryAsPromised
(webpack-internal:///./node_modules/retry-as-promised/index.js:60:10)
at eval
(webpack-internal:///./node_modules/sequelize/lib/sequelize.js:631:30)
From previous event:
at Sequelize.query
(webpack-internal:///./node_modules/sequelize/lib/sequelize.js:580:23)
at Sequelize.authenticate
(webpack-internal:///./node_modules/sequelize/lib/sequelize.js:892:17)
at eval (webpack-internal:///./src/plugins/db/pg.js:23:11)
at Object../src/plugins/db/pg.js (https://ggc.world/js/app.js:1128:1
)
at __webpack_require__ (https://ggc.world/js/app.js:785:30)
at fn (https://ggc.world/js/app.js:151:20)
at eval (webpack-internal:///./src/main.js:16:72)
at Module../src/main.js (https://ggc.world/js/app.js:1083:1)
at __webpack_require__ (https://ggc.world/js/app.js:785:30)
at fn (https://ggc.world/js/app.js:151:20)
at Object.1 (https://ggc.world/js/app.js:1141:18)
at __webpack_require__ (https://ggc.world/js/app.js:785:30)
at checkDeferredModules (https://ggc.world/js/app.js:46:23)
at https://ggc.world/js/app.js:861:18
at https://ggc.world/js/app.js:864:10
In /src/main.js :
import '@/plugins/db/pg';
(base) /src/plugins/db$ ls -lah
total 28K
drwxr-xr-x 6 marco marco 4,0K apr 20 15:42 .
drwxr-xr-x 3 marco marco 4,0K apr 20 15:41 ..
drwxr-xr-x 2 marco marco 4,0K apr 20 17:20 config
drwxr-xr-x 2 marco marco 4,0K apr 20 15:48 migrations
drwxr-xr-x 2 marco marco 4,0K apr 20 15:48 models
-rw-r--r-- 1 marco marco 819 apr 20 08:53 pg.js
drwxr-xr-x 2 marco marco 4,0K apr 20 17:21 seeders
nano pg.js
const { Pool } = require('pg');
const { Sequelize } = require('sequelize');
const pool = new Pool();
const sequelize = new Sequelize('pusers', 'postgres', 'pwd', {
host: 'localhost',
dialect: 'postgres',
pool: {
max: 5,
min: 0,
acquire: 30000,
idle: 10000
}
});
sequelize
.authenticate()
.then(() => {
console.log('Connection has been established successfully.');
})
.catch(err => {
console.log('Unable to connect to the database:', err);
});
module.exports = {
query: (text, params, callback) => {
return pool.query(text, params, callback);
},
}
Populated the sample database with a row:
pusers=# SELECT schemaname,relname,n_live_tup
pusers-# FROM pg_stat_user_tables
pusers-# ORDER BY n_live_tup DESC;
schemaname | relname | n_live_tup
------------+---------------+------------
public | pusers | 1
public | SequelizeMeta | 1
(2 rows)
I read here:
https://stackoverflow.com/questions/40599069/node-js-net-socket-is-not-a-constructor
that
"there are no plain TCP sockets in the browser, so that is why trying to
use `net.Socket` in the browser (via webpack, browserify, etc.) won't work"
Environment Info:
System:
OS: Linux 5.3 Ubuntu 18.04.4 LTS (Bionic Beaver)
CPU: (8) x64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
Binaries:
Node: 12.15.0 - ~/.nvm/versions/node/v12.15.0/bin/node
Yarn: 1.22.4 - ~/.nvm/versions/node/v12.15.0/bin/yarn
npm: 6.14.4 - ~/.nvm/versions/node/v12.15.0/bin/npm
Browsers:
Chrome: 81.0.4044.92
Firefox: 75.0
npmGlobalPackages:
@vue/cli: 4.2.3
So... how to solve the problem?
Looking forward to your kind help.
Marco
