# Entando Bundle

The structure of an Entando Bundle leverages composable development methods, decoupling microservices, micro frontends, API management, and services such as databases. The ent bundle CLI module administers the process, using the descriptor entando.json. This single bundle descriptor defines all the components and resources of the docker-based bundle. The following page describes the descriptor, the structure, its conventions, and the building process.

The docker-based approach is an improvement on the previous Entando Bundle structure and to see the differences, refer to the Bundle Evolution page.

# Entando Bundle Conventions

There is a single bundle descriptor, entando.json, initialized and managed by the ent bundle CLI.
Microservices and micro frontends can be built independently, each with their own folders.
The platform directory is dedicated to platform specific components such as fragments, pages, and static resources. For more information on component types and descriptors, see the Bundle Component Details page.
The svc directory is allocated for auxiliary services and the docker-compose configuration files that define them. The ent bundle module enables, starts and stops the services. MySQL, PostgreSQL, and Keycloak services are available with Entando out of the box, and for more details, go to the ent CLI Services page.
Optionally, a thumbnail for your bundle can be set by adding a JPG or PNG image file to the bundle root folder. The file must be named "thumbnail" and be 100kb or less, e.g. thumbnail.png.

# Project Structure

   bundle-project/
  .git/
  .entando/  <= An internal working folder for caches, logs, and build artifacts
    config.json    
    output/
      descriptors/
    logs/
      microservices/
      microfrontends/
  microservices/   <= Source and build output for each microservice
    ms1/    
    ms2/   
    ms3/       
  microfrontends/  <= Source and build output for each microfrontend
    mfe1/   
    mfe2/   
    mfe3/   
    mfe3-config        
platform/     <= platform specific components    
    pageTemplates/
      page-template.yaml
    pages/  
  svc/     <= auxiliary services for local development 
    keycloak.yaml
    ...         
  entando.json    <= project bundle descriptor
  thumbnail.jpg   <= bundle thumbnail

Note: For a full list of platform components, see the Bundle Component Descriptors page.

# Bundle Development Process

Bundle Development Process

The ent bundle CLI module manages the building and publishing of an Entando Bundle. From initialization to installation, from adding MFEs and MSs to calling for services such as Keycloak and making API claims, the ent bundle commands streamline the development process.

At initialization, the project scaffolding is built. A project can be started from scratch with this structure or retrieved interactively from an Entando Hub as a starting point for new bundles. Microservices, micro frontends, components, services, and API claims can then be added. At this stage, components can be run locally and independently with the ent bundle commands.

The next steps build and pack the project using the bundle descriptor. The specifics depend on the component type and stack. The build phase constructs the microservices and micro frontends while the pack command generates the artifacts and Docker images. Images are built for the bundle and for each microservice.

In the publish step, images are pushed to a Docker registry and tagged according to the bundle configuration. A custom registry can also be used.

Bundle Publishing Process

Finally, the bundle is deployed into the Local Hub of a running Entando instance where it can then be installed. Any improvements to the bundle can be made by repeating the four steps: pack, publish, deploy and install. Alternatively, the install step can be done in the App Builder UI by the composer designing the application.

At every phase of the process, options are available to fine-tune the process, and to see more information, go to the ent bundle CLI documentation.

# Bundle Descriptor entando.json

The following is a list of specifications for the bundle descriptor and its component parts.

# Bundle Descriptor Specifications

Name	Type	Required	Description
`name`	String	Yes	The bundle project name used as the default Docker image name
`description`	String	No	A description of the bundle project shown in the App Builder
`version`	String	Yes	The bundle version used as the default Docker image tag
`displayName`	String	No	A descriptive label used in the UI in place of a name
`global`	Global[]	No	Global bundle configuration items
`microservices`	Microservices	No	Bundle microservices
`microfrontends`	Micro Frontends	No	Bundle micro frontends

{
  "name": "my-bundle-name",
  "description": "my bundle description",
  "type" : "bundle",
  "version": "0.0.1",
  "svc": [
        "keycloak"
    ]
}

# Microservices Specifications

Name	Type	Required	Possible Values	Description
`name`	String	Yes		Microservice name
`stack`	Enum	Yes	spring-boot node *custom	Microservice stack
`dbms`	Enum	No	none embedded postgresql mysql *oracle	DBMS required by the MS to provide services
`ingressPath`	String	No		Custom ingress path
`healthCheckPath`	String	No		Endpoint for a health check
`deploymentBaseName`	String	No		Used to define custom pod names
`permissions`	Permission[]	No		List of permissions to grant to the microservice
`roles`	String[]	No		Exposed security roles
`env`	EnvironmentVariable[]	No		Required environment variables
	Microservices Environment Variables	No		Entando-provided env variables for MS
`commands`	Command[]	No		Custom command(s) definitions
`version`	String	Required only for a custom stack		Microservice version override

# Microservices Sample Code

"microservices": [
    {
      "name": "my-ms",
      "stack": "spring-boot",
      "dbms": "mysql",
      "ingressPath": "/ingress",
      "healthCheckPath": "/management/health",
      "roles": ["admin"],
      "env": [
        { "name": "SIMPLE_VAR",
          "value": "mySimpleValue" 
        },
        { "name": "SECRET_VAR",
          "secretKeyRef": {
              "name": "YOUR-BUNDLE-ID-my-secret", 
              "key": "mySecretKey"
          }
        }
      ]
    }
  ]

# Microservices Details

Entando recommends that REST APIs be added to microservices.
To utilize environment variables, inline or based on Kubernetes Secrets, see the Plugin Environment Variables tutorial.
Entando uses the healthCheckPath to monitor the health of the microservice. A plugin in an Entando Bundle can use any technology, as long as it provides a health check service configured via the healthCheckPath. This path must be specified in the descriptor file and return an HTTP 200 or success status. This can be implemented by a Java service included with the Entando Blueprint in the Spring Boot application. You can also use a Node.js service as shown here (opens new window).

# Micro Frontends Specifications

Name	Type	Required	Possible Values	Description
`name`	String	Yes		Micro frontend name
`stack`	Enum	Yes	react angular *custom	MFE stack
`type`	Enum	Yes	widget widget-config *app-builder	Category of MFE
`slot`	Enum	Yes for `type=app-builder`	primary-header primary-menu *content	Named reference to an App Builder embedded position in a specific layout
`paths`	String[]	Yes for `type=app-builder` and `slot=content`		App Builder activation paths
`titles`	String[]	Yes for `type=widget`		Localized widget labels
`group`	String	Yes		Visibility group name
`publicFolder`	String	No	Default is `public`	MFE public folder (typically where index.html is located)
`apiClaims`	String[]	No		See API Claim spec below
`nav`	MenuEntry[]	No		Bundle menu global links
`commands`	Command[]	No		Custom commands definitions
`buildFolder`	String	No	Default is `build`	Corresponds to the MFE build folder
`configMfe`	String	No		The custom element for the corresponding widget-config MFE
`params`	MfeParam[]	Yes		User configuration for executing a widget
`contextParams`	String[]	Yes		Information extracted from the application context
`version`	String	Required only for custom stack MFE		Microfrontend version override

# Micro Frontends Sample Code

 "microfrontends": [
    {
      "name": "my-mfe",
      "stack": "react",
      "titles": { "en": "My MFE Title", "it": "Il Mio Titolo MFE" },
      "type": "app-builder",
      "slot": "content",
      "paths": ["/path1"],
      "group" : "free",
      "apiClaims": [...]
    },
    {
      "name": "my-mfe2",
      "stack": "custom",
      "type": "widget",
      "publicFolder": "public",
      "titles": { "en": "My MFE2 Title", "it": "Il Mio Titolo MFE2" },
      "group": "free",
      "commands": {
          "build": "echo 'Please edit this command to customize the build phase' && exit 1",
          "run": "echo 'Please edit this command to customize the run phase' && exit 1",
          "pack": "echo 'Please edit this command to customize the pack phase' && exit 1"
      },
      "version": "0.0.1"
    }
   ]

# Configure a Path for Static Assets

To configure your micro frontend with access to static assets, Entando provides two paths, one for widgets and another for EPCs.

For widgets: window.entando?.widgets['YOUR-MFE']?.basePath;
For EPCs: window.entando?.epc['YOUR-EPC']?.basePath;

See the instructions for setting the path in a React MFE.

# API Claim Specification

Name	Type	Required	Possible Value	Description
`name`	String	Yes		Name
`type`	Enum	Yes	internal external	Category of claim, either inside the same bundle (internal) or same namespace (external)
`serviceName`	String	Yes		The name of the microservice
`serviceUrl`	String	No		The URL of the microservice deployed in the local environment
`bundle`	String	Yes only for `type=external`		Bundle Docker URL

# API Claim Spec Sample

 "apiClaims": [
   {
     "name": "int-api-claim",
     "type": "internal",
     "serviceName": "my-ms"
   },
   {
     "name": "ext-api-claim",
     "type": "external",
     "serviceName": "my-ext-bundle-ms",
     "bundle": "registry.hub.docker.com/my-organization/my-ext-bundle-ms"
   }
 ]

For more information, go to the API Management page.

# Command Specification

Name	Type	Required	Description
`build`	String	No	Custom build command
`run`	String	No	Custom run command
`pack`	String	No	Custom pack command

# Command Spec Sample Code

  "commands": {
    "run": "mvn -Dspring-boot.run.arguments=\"--server.port=8082\" spring-boot:run"
  }

Depending on the stack type, default values are:

build: mvn test, npm run test
run: mvn spring-boot:run, npm run start
pack: mvn package, npm run build

# EnvironmentVariables Specification

Name	Type	Required	Description
`name`	String	Yes	Name of the env variable to inject
`value`	String	No	Value to give to the env variable
`secretKeyRef`	SecretKeyRef[]	No	A reference to a secret

# Microservices Environment Variables

The following are platform-provided runtime variables.

Name	Type	Description
`KEYCLOAK_REALM`	string	Keycloak or Red Hat Single Sign-On (RH-SSO) realm to be used by the MS.
`KEYCLOAK_AUTH_URL`	string	Keycloak/RH-SSO URL to be used by the MS.
`KEYCLOAK_CLIENT_SECRET`	`secretKeyRef[]`	Keycloak/RH-SSO autogenerated clientSecret to be used by the MS.
`KEYCLOAK_CLIENT_ID`	`secretKeyRef[]`	Keycloak/RH-SSO autogenerated clientId to be used by the MS.
`SERVER_SERVLET_CONTEXT_PATH`	string	Context path used to access the MS. Automatically handled by a Spring Boot MS, but can be manually set for other `stack` types.
`SPRING_PROFILES_ACTIVE`	string	Application profile to use when the MS runs on Entando, differentiating dev vs prod at runtime. Automatically handled by a Spring Boot MS but can be manually managed if using another technology `stack`.
`SPRING_DATASOURCE_URL`	string	Provisioned database JDBC connection URL. Automatically handled by a Spring Boot MS but can be manually managed if using another technology `stack`.
`SPRING_DATASOURCE_USERNAME`	string	Provisioned database username. Automatically handled for a Spring Boot MS, but can be manually managed if using another technology `stack`.
`SPRING_DATASOURCE_PASSWORD`	string	Provisioned database password. Automatically handled for a Spring Boot MS, but can be manually managed if using another technology `stack`.

# Global Specification

Name	Type	Required	Possible Values	Description
`nav`	MenuEntry[]	No		Bundle menu global links

# MenuEntry Specification

Name	Type	Required	Possible Values	Description
`label`	String[]	Yes		Localized entry in the PBC menu
`target`	Enum	Yes	internal external	Where to open the menu link
`url`	String			Address of the page to open when the menu is clicked

# MfeParam Specification

Name	Type	Required	Description
name	String	Yes	Name of the parameter
description	String	No	Description of the parameter

  "params": [
      {
        "name": "username",
        "description": "username of user"
      },
      {
        "name": "description",
        "description": "description of user"
      }
  ],
  "contextParams": [
      "page_code"
  ]

# Permission Specification

Name	Type	Required	Description
clientId	string	Yes	The clientId of the other MS this MS needs access to
role	string	Yes	The role required on the OIDC client of the service that the MS needs access to

# SecretKeyRef Specification

Name	Type	Required	Description
`name`	String	Yes	The secret name
`key`	String	Yes	The secret key inside the secret object

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