Full stack JavaScript based microservices for HEIs

Full-stack JavaScript based
micro-services for complete
automation of Higher Education
Institutions (HEIs)
Arun kumar Krishnamoorthy
Software Technologies

Thinking Big in JavaScript
Your Footer Here 2
• Increased
Tooling
across dev
life cycle
• Abundance
of
frameworks
across value
chain
 Richer Language
Features
 More reliable,
better
performing
server-side
middleware

2 Biggest Motivations of using
JavaScript across layers
10 Jan 2019 https://jsfoo.in/2019-pune/ 3
• Open
source for
life time
 One core
technology
across layers

Functions of Higher Education
Institution
Admissions
Application
Ranking and
Selection
Admissions
Process
Students
Management
Profile
Life cycle
Student
Services
Curriculum
Design
Programmes
and Scheme
Detailed
Syllabus
Review and
Publish
Faculty and
Staff
Management
Profile
Faculty
Services
Performance
Reporting &
Awards

Institution
Fees
Collection
Accounting
Structure
Fee
Components,
Structure
Fee Collection
and tracking
Academic
Administration
Calendar,
Workloads,
Attendance
Assessments,
Outcome
Attainment
Academic
Activities, IQAC
Examination
Enrollments,
Exam Fees
Exam Calendar,
Seating, Hall
ticket
Evaluation,
Outcome,
Results
Placements
Company
database
Placement
Schedule,
Student select
Interview
process, Status
tracker

Institution
Events
Co-curricular
and Extra-
curricular
Agenda,
Gallery, Write-
up
Registrations,
ticketing
Grievance
/ Feedback
Authorities for
redressal
Logging and
tracking
Escalation
rules
Alumni
Alumni
Database
Periodic News
letter
Posts,
Collaboration
for a cause
Hostels
Requests and
Room
Allotments
Fees, Caution
Deposit, Mess
Bills
In-out tracker,
approval,
notifications

Institution
Showcase
through a
dynamic,
engaging
Website
Awards
Events
Courses
Infra

Characteristics of the Problem
Domain
• Well-defined, well-managed and controlled functions
• Clear ownership of data
• Ex. Admissions, Students enrollments, Programme scheme
and syllabus
• Predictable peak, average workloads
• Ex. last date of applications, results announcements, last date
of fees payment, important news / events / announcements
• Inherent data partitions – Transactional in an academic
year, Analytical for historical data
• Deadlines are truly real and availability is very critical
• Ex: Exam dates, fees payment due date, reopening date
Your Date Here https://jsfoo.in/2019-pune/ 8

Architecture Drivers
• Schema less across layers to cater to varying needs
of different fields of Higher Education
• Loosely coupled across functions
• Scale-up / Scale-down independently
• Distributed deployment, cloud agnostic, hybrid
• Open source reducing Total Cost of Ownership
• Shallow learning curve and Rapid prototyping /
development
• Single-sign-on across functions
1/18/2019 https://jsfoo.in/2019-pune/ 9

Design Principles
• Single Responsibility Principle
• Inversion of Control (Dependency Injection)
• Interface over Implementation

Microservice
An architectural style that structures an application
as a collection of services that are
• Highly maintainable and testable
• Loosely coupled
• Independently deployable
• Organized around business capabilities

Microservice
• Enables the continuous delivery/deployment of
large, complex applications
• Enables an organization to evolve its technology
stack
https://microservices.io

JavaScript +
MicroService
To our rescue

A Typical MicroService
• Traditional MEAN Stack
• MongoDB Native Driver
• Auth using KeyCloak
• API based Remoting
• Messaging based Pub / Sub
• Logging – HTTP and Application logging
• pm2 for runtime and process management
• Entry in nginx for routing
• Jenkins Pipeline and Docker

Reusable DAO Layer
• Native MongoDB Driver over Mongoose
• Schema and field validation / restriction moved to
Business Logic Layer
• Flexible data model accommodates varying data model
• Generics in Java Vs Closure in JavaScript
• Link to BaseDao -
https://github.com/arunramkrish/hasgeek-jsfoo-
pune-2019/blob/master/dao/baseDao.js

Auth using Keycloak
• One user realm for all microservices
• One keycloak application client for each
microservice
• User associated to Groups and each group
associated to client specific roles
• Customized login theme with branding
https://www.keycloak.org/docs/3.0/securing_apps/t
opics/oidc/javascript-adapter.html

REST Client for API based
Integration
• Using node-rest-client

Rabbit MQ for Messaging / Event
Bus
• Pub-Sub
• P2P
• Reliable
• Link to npm module for connecting to RabbitMQ
• As a sender
• As a receiver
https://www.npmjs.com/package/event-gateway-psg

Logging
• Effective use of Log levels, log formats, file roll over
on size / date
• Separate logs for disparate use cases

PM2 as Process Manager
• High availability
• Auto-recovery from crashes
• Start-up config with NODE_ENV variable
https://pm2.io/doc/en/runtime/overview/

NGINX
• Routes traffic to different Microservice
• Acts as reverse proxy
• Terminates SSL to use HTTP with Microservice
https://docs.nginx.com/nginx/admin-guide/

Jenkins and Docker
• Delivery Pipeline Automation
• Build versions and auto tagging

PDFKit
• Complete control of PDF
• Text, Images, Fonts, Shapes
• Multiple pages, different page sizes

NativeScript Angular
• Truly native mobile App for Android and iPhone
from a single codebase using single skillset
https://www.nativescript.org/nativescript-is-how-
you-build-native-mobile-apps-with-angular

Thank you
https://github.com/arunramkrish
arunram.krish@gmail.com
@arunramkrish
1/18/2019 25

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