DIGIT Core
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2.8
2.8
  • β˜‘οΈIntroducing DIGIT Platform
    • DIGIT - Value Proposition
  • Platform
    • πŸ”ŽOverview
      • Principles
      • Architecture
        • Service Architecture
        • Infrastructure Architecture
        • Deployment Architecture
      • Technology
        • API Gateway
        • Open Source Tools
      • Checklists
        • API Checklist
        • Security Checklist
          • Security Guidelines Handbook
          • Security Flow - Exemplar
        • Performance Checklist
        • Deployment Checklist
      • UI Frameworks
        • React UI Framework
    • πŸ”§Core Services
      • Workflow Service
        • Setting Up Workflows
        • Configuring Workflows For An Entity
        • Workflow Auto Escalation
        • Migration To Workflow 2.0
      • Location Services
      • User Services
      • Access Control Services
      • PDF Generation Service
      • MDMS (Master Data Management Service)
        • Setting up Master Data
          • MDMS Overview
          • MDMS Rewritten
          • Configuring Tenants
          • Configuring Master Data
          • Adding New Master
          • State Level Vs City Level Master
      • Payment Gateway Service
      • User Session Management
      • Indexer Service
        • Indexer Configuration
      • URL Shortening Service
      • XState Core Chatbot
        • Xstate-Chatbot Message Localisation
        • XState-Chatbot Integration Document
      • NLP Engine Service
        • NLP Chatbot
      • SMS Template Approval Process
      • Telemetry Service
      • Document Uploader Service
      • Notification Enhancement Based On Different Channel
      • Report Service
        • Configuring New Reports
          • Impact Of Heavy Reports On Platform
          • Types Of Reports Used In Report Service
      • SMS Notification Service
        • Setting Up SMS Gateway
          • Using The Generic GET & POST SMS Gateway Interface
      • Survey Service
      • Persister Service
        • Persister Configuration
      • Encryption Service
        • Encryption Client Library
        • User Data Security Architecture
        • Guidelines for supporting User Privacy in a module
      • FileStore Service
      • ID Generation Service
      • Localization Service
        • Configuring Localization
          • Setup Base Product Localization
          • Configure SMS and Email
      • Email Notification Service
      • Searcher Service
      • Zuul Service
      • User OTP Service
      • OTP Service
      • Chatbot Service
      • National Dashboard Ingest
        • National Dashboard API Performance Testing Specs and Benchmark
        • National Dashboard: Steps for Index Creation
        • National Dashboard Adaptor Service
          • Deployment of Airflow DAG
          • Trigger Airflow DAG
          • Configure Airflow
          • Insert & Delete Data - Steps
          • Important Links & Credentials
          • Code Structure
          • KT Sessions
          • Pre-requisites For Enabling Adaptor
        • Revenue Maximisation
      • Audit Service
        • Signed Audit Performance Testing Results
      • Service Request
      • Self Contained Service Architecture (HLD)
      • Accelerators
        • Inbox Service
    • ✏️API Specifications
      • User
      • Access Control
      • Employee
      • Location
      • Localisation
      • Encryption
      • Indexer
      • File Store
      • Collection
      • DSS Ingest
      • HRMS
      • National Dashboard Ingest
      • WhatsApp Chatbot
      • Master Data Management
      • ID Generation
      • URL Shortner
      • Workflow Service
      • Workflow v2
      • Document Uploader Service
      • OTP Service
      • Reporting Service
      • PDF Generation Service
      • Payment Gateway Service
    • πŸ”Data Protection & Privacy
      • Data Protection & Privacy Definitions
      • Legal Obligations For Privacy - eGov
      • Data Protection & Privacy - Global Best Practices
      • Guidelines
        • Platform Owner Guidelines
        • Implementing Agencies Guidelines
        • Admin Guidelines
        • Program Owner Guidelines
        • Data Security and Data Privacy
      • Data Privacy Policy Templates
        • eGov Data Privacy Policy
        • Implementing Agency Privacy Policy
        • Admin & Program Owner Privacy Policy
        • Supporting Agency Privacy Policy
      • Global Standards For All Roles
    • ▢️Get Started
      • Install DIGIT
      • Access DIGIT
      • Sandbox
      • Training and Certification
        • Training Resources
    • βš’οΈIntegrations
      • Payment
      • Notification
      • Transaction
      • Verification
      • View
      • Calculation
    • πŸ›£οΈRoadmap
    • 🎬Open Events
    • πŸ‘©β€πŸ’»Source Code
    • πŸ‘οΈProject Plan
    • πŸ“‹Discussion Board
    • 🀝Contribute
  • Guides
    • πŸ““Installation Guide
      • DIGIT Deployment
      • Quick Setup
        • DIGIT Installation on Azure
        • DIGIT Installation on AWS
      • Production Setup
        • AWS
          • 1. Pre-requisites
          • 2. Understanding EKS
          • 3. Setup AWS Account
          • 4. Provisioning Infra Using Terraform
          • 5. Prepare Deployment Config
          • 6. Deploy DIGIT
          • 7. Bootstrap DIGIT
          • 8. Productionize DIGIT
          • FAQ
        • Azure
          • 1. Azure Pre-requisites
          • 2. Understanding AKS
          • 3. Infra-as-code (Terraform)
        • SDC
          • 1. SDC Pre-requisites
          • 2. Infra-as-code (Kubespray)
          • CI/CD Setup On SDC
        • CI/CD Set Up
          • CI/CD Build Job Pipeline Setup
        • Prepare Helm Release Chart
        • Deployment - Key Concepts
          • Security Practices
          • Readiness & Liveness
          • Resource Requests & Limits
          • Deploying DIGIT Services
          • Deployment Architecture
          • Routing Traffic
          • Backbone Deployment
    • πŸ’½Data Setup Guide
      • User Module
      • Localisation Module
      • Location Module
    • πŸš₯Design Guide
      • Model Requirements
      • Design Services
      • Design User Interface
      • Checklists
    • βš’οΈDeveloper Guide
      • Pre-requisites Training Resources
      • Backend Developer Guide
        • Section 0: Prep
          • Development Pre-requisites
          • Design Inputs
            • High Level Design
            • Low Level Design
          • Development Environment Setup
        • Section 1: Create Project
          • Generate Project Using API Specs
          • Create Database
          • Configure Application Properties
          • Import Core Models
          • Implement Repository Layer
          • Create Validation & Enrichment Layers
          • Implement Service Layer
          • Build The Web Layer
        • Section 2: Integrate Persister & Kafka
          • Add Kafka Configuration
          • Implement Kafka Producer & Consumer
          • Add Persister Configuration
          • Enable Signed Audit
          • Run Application
        • Section 3: Integrate Microservices
          • Integrate IDGen Service
          • Integrate User Service
          • Add MDMS Configuration
          • Integrate MDMS Service
          • Add Workflow Configuration
          • Integrate Workflow Service
          • Integrate URL Shortener Service
        • Section 4: Integrate Billing & Payment
          • Custom Calculator Service
          • Integrate Calculator Service
          • Payment Back Update
        • Section 5: Other Advanced Integrations
          • Add Indexer Configuration
          • Certificate Generation
        • Section 6: Run Final Application
        • Section 7: Build & Deploy Instructions
        • FAQs
      • Flutter UI Developer Guide
        • Introduction to Flutter
          • Flutter - Key Features
          • Flutter Architecture & Approach
          • Flutter Pre-Requisites
        • Setup Development Environment
          • Flutter Installation & Setup Guide
          • Setup Device Emulators/Simulators
          • Run Application
        • Build User Interfaces
          • Create Form Screen
        • Build Deploy & Publish
          • Build & Deploy Flutter Web Application
          • Generate Android APKs & App Bundles
          • Publishing App Bundle To Play Store
        • State Management With Provider & Bloc
          • Provider State Management
          • BloC State Management
        • Best Practices & Tips
        • Troubleshooting
      • UI Developer Guide
        • DIGIT-UI
        • Android Web View & How To Generate APK
        • DIGIT UI Development Pre-requisites
        • UI Configuration (DevOps)
        • Local Development Setup
        • Run Application
        • Create New Screen In DIGIT-UI
          • Create Screen (FormComposer)
          • Inbox/Search Screen
          • Workflow Component
        • Customisation
          • Integrate External Web Application/UI With DIGIT UI
          • Utility - Pre-Process MDMS Configuration
          • CSS Customisation
        • Citizen Module Setup
          • Sample screenshots
          • Project Structure
          • Install Dependency
          • Import Required Components
          • Write Citizen Module Code
          • Citizen Landing Screen
        • Employee Module Setup
          • Write Employee Module Code
        • Build & Deploy
        • Setup Monitoring Tools
        • FAQs
          • Troubleshoot Using Browser Network Tab
          • Debug Android App Using Chrome Browser
    • πŸ”„Operations Guide
      • DIGIT - Infra Overview
      • Setup Central Instance Infra
      • Central Monitoring Dashboard Setup
      • Kubernetes
        • RBAC Management
        • DB Dump - Playground
      • Setup Jenkins - Docker way
      • GitOps
        • Git Client installation
        • GitHub organization creation
        • Adding new SSH key to it
        • GitHub repo creation
        • GitHub Team creation
        • Enabling Branch protection:
        • CODEOWNER Reviewers
        • Adding Users to the Git
        • Setting up an OAuth with GitHub
        • Fork (Fork the mdms,config repo with a tenant-specific branch)
      • Working with Kubernetes
        • Installation of Kubectl
      • Containerizing application using Docker
        • Creation of Dockerhub account
      • Infra provisioning using Terraform
        • Installation of Terraform
      • Customization of existing tf templates
      • Cert-Manager
        • Obtaining SSL certificates with the help of cluster-issuer
      • Moving Docker Images
      • Pre and post deployment checklist
      • Multi-tenancy Setup
      • Availability
        • Infrastructure
        • Backbone services
          • Database
          • Kafka
          • Kafka Connect
          • Elastic search
            • ElasticSearch Direct Upgrade
            • Elastic Search Rolling Upgrade
        • Core services
        • DIGIT apps
        • DSS dashboard
      • Observability
        • ES-Curator to clear old logs/indices
        • Monitoring
        • Tracing
        • Jaeger Tracing Setup
        • Logging
        • eGov Monitoring & Alerting Setup
        • eGov Logging Setup
      • Performance
        • What to monitor?
          • Infrastructure
          • Backbone services
          • Core services
        • Identifying bottlenecks
        • Solutions
      • Handling errors
      • Security
      • Reliability and disaster recovery
      • Privacy
      • Skillsets/hiring
      • Incident management processes
      • Kafka Troubleshooting Guide
        • How to clean up Kafka logs
        • How to change or reset consumer offset in Kafka?
      • SRE Rituals
      • FAQs
        • I am unable to login to the citizen or employee portal. The UI shows a spinner.
        • My DSS dashboard is not reflecting accurate numbers? What can I do?
      • Deployment using helm
        • Helm installation:
        • Helm chart creation
        • Helm chart customization
      • How to Dump Elasticsearch Indexes
      • Deploy Nginx-Ingress-Controller
      • Deployment Job Pipeline Setup
      • OAuth2-Proxy Setup
      • Jira Ticket Creation
  • Reference
    • πŸ‘‰Setup Basics
      • Setup Requirements
        • Tech Enablement Training - Essential Skills and Pre-requisites
        • Tech Enablement Training (eDCR) - Essential Skills and Prerequisites
          • Development Control Rules (Digit-DCR)
          • eDCR Approach Guide
        • DIGIT Rollout Program Governance
        • DevOps Skills Requirements
        • Infra Requirements
        • Team Composition for DIGIT Implementation
        • Infra Best Practices
        • Operational Best Practices
        • Why Kubernetes For DIGIT
      • Supported Clouds
        • Google Cloud
        • Azure
        • AWS
        • VSphere
        • SDC
      • Deployment - Key Concepts
        • Security Practices
        • CI/CD
        • Readiness & Liveness
        • Resource Requests & Limits
      • Understanding ERP Stack
        • ERP Monolithic Architecture
        • ERP Hybrid Architecture
        • ERP Coexistence Architecture
        • APMDP-HYBRID-INFRA ARCHITECTURE
        • eGov SmartCity eGovernance Suite
        • ERP Deployment Process
        • ERP Release Process
        • ERP User Guide
      • Deploying DIGIT Services
        • Deployment Architecture
        • Routing Traffic
        • Backbone Deployment
      • Troubleshooting
        • Distributed Tracing
        • Logging
        • Monitoring & Alerts
    • πŸ“₯Reference Reads
      • Analytics
      • DevSecOps
      • Low Code No Code
        • Application Specification
      • Beneficiary Eligibility
      • Government and Open Digital Platforms
      • Microservices and Low Code No Code
      • Registries
      • Platform Orientation - Overview
    • πŸ”Data Security
      • Signed Data Audit
      • Encryption Techniques
      • Approaches to handle Encrypted Data
    • ❕Privacy
    • πŸ•ΉοΈDevOps
      • 1. How DNS works
      • 2. Load Balancer
      • 3. SSL/Cert-manager
      • 4.Ingress,WAF
      • 5.VPC
      • 6.Subnets
      • 7.EKS
      • 8.Worker Node Group
      • 9.RDS
      • 10.NAT
      • 11.Internet Gateway
      • 12.Block Storage (EBS Volumes)
      • 13.Object Storage (S3)
      • 14. Telemetry
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All content on this page by eGov Foundation is licensed under a Creative Commons Attribution 4.0 International License.

On this page
  • Overview
  • Pre-requisites
  • Key Functionalities
  • Components
  • Features
  • Configuration Details
  • Deployment Details
  • Integration Details
  • Integration Scope
  • Integration Benefits
  • Integration Steps

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  1. Platform
  2. Core Services

Zuul Service

Overview

An API Gateway provides a unified interface for a set of microservices so that clients do not need to know about all the details of microservice internals.

DIGIT uses Zuul as an edge service that proxies request to multiple back-end services. It provides a unified β€œfront door” to our ecosystem. This allows any browser, mobile app or other user interface to consume underlying services.

Pre-requisites

Before you proceed with the documentation, make sure the following pre-requisites are met -

  • Java 8

  • egov-user service is running

  • egov-accesscontrol service is running

Key Functionalities

  • Provides easier API interface to clients

  • Can be used to prevent exposing the internal micro-services structure to the outside world.

  • Allows to refactor microservices without forcing the clients to refactor consuming logic

  • Can centralize cross-cutting concerns like security, monitoring, rate limiting etc

Components

Zuul has mainly four types of filters that enable us to intercept the traffic in the different timelines of the request processing for any particular transaction. We can add any number of filters for a particular URL pattern.

  • pre-filters – are invoked before the request is routed.

  • post filters – are invoked after the request has been routed.

  • route filters – are used to route the request.

  • error filters – are invoked when an error occurs while handling the request.

Features

  • Microservice authentication and security

  • Authorization

  • API Routing

  • Open APIs using Whitelisting

  • RBAC filter

  • Logout filter for the finance module

  • Property module tax calculation filter for firecess

  • Request enrichment filter:

  • Addition of co-relation id

  • Addition of authenticated user (userinfo) to requestInfo.

  • Error filter:

    • Error response formatting

  • Validation Filter to check if a tenant of a particular module is enabled or not.

  • Multitenancy Validation Filter. Take the tenant id from the Req body or Query Param and validate against the additional tenant role or primary tenant role.

  • DevOps efficiency: API response time for logging and sending notifications if it is taking more time.

  • Rate Throttling

Configuration Details

Routing Property

For each service, below mentioned property has to be add-in routes.properties

-zuul.routes.{serviceName}.path = /{context path of service}/**
-zuul.routes.{serviceName}.stripPrefix = {true/false}
-zuul.routes.{serviceName}.url = {service host name}

Rate Limiting Property

For endpoints which require rate throttling, below mentioned property has to be added in limiter.properties

-zuul.ratelimit.policy-list.{serviceName}[0].limit={request number limit per refresh interval window} 
-zuul.ratelimit.policy-list.{serviceName}[0].quota={request time limit per refresh interval window (in seconds)} 
-zuul.ratelimit.policy-list.{serviceName}[0].refresh-interval={refresh interval in seconds} 
-zuul.ratelimit.policy-list.{serviceName}[0].type[0]=url={url of API endpoint
-zuul.ratelimit.policy-list.{serviceName}[0].type[1]={type of throttling eg: user, origin etc.}

Deployment Details

  1. Deploy the latest version of the Zuul service.

  2. Add Zuul routing context paths and service hostname in the configuration.

Integration Details

Integration Scope

The Zuul service is used to act as an API gateway for services which citizens avail from ULBs.

Integration Benefits

  • Can perform service-specific business logic without impacting the other module.

  • Provides the capability of routing and authorizing users for accessing resources.

Integration Steps

  1. To integrate, the host of the Zuul module should be overwritten in the helm chart.

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