Realmjs not working after deployment in serverless framework

[mithunph]

Hi, I have installed Realmjs which is working fine in local. But after deployment, it is showing error when i require(or import) that package.
Showing error in the below line
const Realm = require('realm');

Below is the full logs of error:
Unable to import module 'server': Error
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object. (/var/task/node_modules/realm/lib/index.js:103:28)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object. (/var/task/controllers/realmController.js:3:15)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)

[bmunkholm]

@mithunph Could you please fill out the issues template? Specifically how we should reproduce this?

[mithunph]

Hi @bmunkholm ,
Below is my realmController.js file:
const Realm = require('realm');
const studentSchema = {
name: 'Students',
properties: {
questionId: {type: 'string'},
subconceptId: {type: 'string', default: '0'},
pointsAchievable: {type: 'int', default: 0},
pointsAchieved: {type: 'int', default: 0},
timeTaken: {type: 'int', default: 0},
}
};
exports.generateOfflineTables = async (req, res) => {
Realm.open({schema: [studentSchema], path: 'students.realm', schemaVersion: 1})
.then(realm => {
realm.write(() => {
console.log('writing file==');
});
realm.close();
})
.catch(error => {
console.log(error);
});
}

I get error in very first line while importing the package

[bmunkholm]

@mithunph Please fill out the entire issue template that occurs when you click "New Issue".

[mithunph]

Hi @bmunkholm ,
Below is the full code,
1.serverless.yml file
service: test-backend
provider:
name: aws
runtime: nodejs8.10
memorySize: 512 # set the maximum memory of the Lambdas in Megabytes
timeout: 10 # the timeout is 10 seconds (default is 6 seconds)
stage: ${opt:stage, 'local'} # setting the env stage to dev, this will be visible in the routes
region: ap-south-1
environment:
DB: ${file(./config.${self:provider.stage}.json):DB}
STAGE: ${file(./config.${self:provider.stage}.json):environment}

functions:
server:
handler: server.run
events:
- http: ANY /
- http: 'ANY {proxy+}'

2. server.js
   const sls = require('serverless-http');
   const handler = require('./handler');
   module.exports.run = sls(handler);

3)handler.js
'use strict';
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const expressValidator = require('express-validator');
const cors = require('cors');
var compression = require('compression');
require('dotenv').config({ path: './variables.env' });
require('./db').connectToDatabase();
app.use(compression()); //use compression
app.use(bodyParser.json({ limit: "50mb" ,strict: false }));
app.use(bodyParser.urlencoded({ limit: "50mb", extended: true, parameterLimit:50000 }));
app.use(expressValidator()); //required for Express-Validator
app.use(cors());

const routes = require('./routes/routes.js')
app.use('/', routes);

module.exports = app;

4)routes.js
var app = express();
const router = express.Router();
const realmController = require('../controllers/realmController');
app.use('/generate-offline-tables', realmController.generateOfflineTables);
app.use('', router);
module.exports = app;

5)realmController.js
const Realm = require('realm');
const studentSchema = {
name: 'Students',
properties: {
questionId: {type: 'string'},
subconceptId: {type: 'string', default: '0'},
pointsAchievable: {type: 'int', default: 0},
pointsAchieved: {type: 'int', default: 0},
timeTaken: {type: 'int', default: 0},
}
};
exports.generateOfflineTables = async (req, res) => {
Realm.open({schema: [studentSchema], path: 'students.realm', schemaVersion: 1})
.then(realm => {
realm.write(() => {
console.log('writing file==');
});
realm.close();
})
.catch(error => {
console.log(error);
});
}

[bmunkholm]

Hi @mithunph
Running on AWS lambda does unfortunately not work at the moment for other reasons than what you see here. Sorry about that.

[mithunph]

I fixed it by adding the below line in package.json
"postinstall": "chmod +x ./bin/build-realm.sh"

Added below code to build-realm.sh file
#!/usr/bin/env bash
set -e
npm install -g node-gyp
npm install -g node-pre-gyp
cd ./node_modules/realm/
node-pre-gyp install --fallback-to-build

[bmunkholm]

Great @mithunph !
I'm curious to know if everything works now, as Amazon has previously had a bug that prevented us from working.