# Spring Boot Cloud CLI

#

Spring Boot CLI provides Spring Boot command line features for Spring Cloud. You can write Groovy scripts to run Spring Cloud component applications (e.g. `@EnableEurekaServer`). You can also easily do things like encryption and decryption to support Spring Cloud Config clients with secret configuration values. With the Launcher CLI you can launch services like Eureka, Zipkin, Config Server conveniently all at once from the command line (very useful at development time).

| Note
Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at github.

# 1. Installation

To install, make sure you have Spring Boot CLI (2.0.0 or better):

    $ spring version
    Spring CLI v2.1.0.M4

E.g. for SDKMan users

    $ sdk install springboot 2.1.0.M4
    $ sdk use springboot 2.1.0.M4

and install the Spring Cloud plugin

    $ mvn install
    $ spring install org.springframework.cloud:spring-cloud-cli:2.1.0.BUILD-SNAPSHOT

| Important
Prerequisites: to use the encryption and decryption features you need the full-strength JCE installed in your JVM (it’s not there by default). You can download the "Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files" from Oracle, and follow instructions for installation (essentially replace the 2 policy files in the JRE lib/security directory with the ones that you downloaded).

# 2. Running Spring Cloud Services in Development

The Launcher CLI can be used to run common services like Eureka, Config Server etc. from the command line. To list the available services you can do `spring cloud --list`, and to launch a default set of services just `spring cloud`. To choose the services to deploy, just list them on the command line, e.g.

    $ spring cloud eureka configserver h2 kafka stubrunner zipkin

Summary of supported deployables:

Service | Name | Address | Description
--- | --- | --- | ---
eureka | Eureka Server | http://localhost:8761 | Eureka server for service registration and discovery. All the other services show up in its catalog by default.
configserver | Config Server | http://localhost:8888 | Spring Cloud Config Server running in the "native" profile and serving configuration from the local directory ./launcher
h2 | H2 Database | http://localhost:9095 (console), jdbc:h2:tcp://localhost:9096/{data} | Relation database service. Use a file path for `{data}` (e.g. `./target/test`) when you connect. Remember that you can add `;MODE=MYSQL` or `;MODE=POSTGRESQL` to connect with compatibility to other server types.
kafka | Kafka Broker | http://localhost:9091 (actuator endpoints), localhost:9092 |
hystrixdashboard | Hystrix Dashboard | http://localhost:7979 | Any Spring Cloud app that declares Hystrix circuit breakers publishes metrics on `/hystrix.stream`. Type that address into the dashboard to visualize all the metrics,
dataflow | Dataflow Server | http://localhost:9393 | Spring Cloud Dataflow server with UI at /admin-ui. Connect the Dataflow shell to target at root path.
zipkin | Zipkin Server | http://localhost:9411 | Zipkin Server with UI for visualizing traces. Stores span data in memory and accepts them via HTTP POST of JSON data.
stubrunner | Stub Runner Boot | http://localhost:8750 | Downloads WireMock stubs, starts WireMock and feeds the started servers with stored stubs. Pass `stubrunner.ids` to pass stub coordinates and then go to `http://localhost:8750/stubs`.

Each of these apps can be configured using a local YAML file with the same name (in the current working directory or a subdirectory called "config" or in `~/.spring-cloud`). E.g. in `configserver.yml` you might want to do something like this to locate a local git repository for the backend:

configserver.yml.

    spring:
      profiles:
        active: git
      cloud:
        config:
          server:
            git:
              uri: file://${user.home}/dev/demo/config-repo

E.g. in Stub Runner app you could fetch stubs from your local `.m2` in the following way.

stubrunner.yml.

    stubrunner:
      workOffline: true
      ids:
        - com.example:beer-api-producer:+:9876

## 2.1 Adding Additional Applications

Additional applications can be added to `./config/cloud.yml` (not `./config.yml` because that would replace the defaults), e.g. with

config/cloud.yml.

    spring:
      cloud:
        launcher:
          deployables:
            source:
              coordinates: maven://com.example:source:0.0.1-SNAPSHOT
              port: 7000
            sink:
              coordinates: maven://com.example:sink:0.0.1-SNAPSHOT
              port: 7001

when you list the apps:

    $ spring cloud --list
    source sink configserver dataflow eureka h2 hystrixdashboard kafka stubrunner zipkin

(notice the additional apps at the start of the list).

# 3. Writing Groovy Scripts and Running Applications

Spring Cloud CLI has support for most of the Spring Cloud declarative features, such as the `@Enable*` class of annotations. For example, here is a fully functional Eureka server

app.groovy.

    @EnableEurekaServer
    class Eureka {}

which you can run from the command line like this

    $ spring run app.groovy

To include additional dependencies, often it suffices just to add the appropriate feature-enabling annotation, e.g. `@EnableConfigServer`, `@EnableOAuth2Sso` or `@EnableEurekaClient`. To manually include a dependency you can use a `@Grab` with the special "Spring Boot" short style artifact co-ordinates, i.e. with just the artifact ID (no need for group or version information), e.g. to set up a client app to listen on AMQP for management events from the Spring CLoud Bus:

app.groovy.

    @Grab('spring-cloud-starter-bus-amqp')
    @RestController
    class Service {
      @RequestMapping('/')
      def home() { [message: 'Hello'] }
    }

# 4. Encryption and Decryption

The Spring Cloud CLI comes with an "encrypt" and a "decrypt" command. Both accept arguments in the same form with a key specified as a mandatory "--key", e.g.

    $ spring encrypt mysecret --key foo
    682bc583f4641835fa2db009355293665d2647dade3375c0ee201de2a49f7bda
    $ spring decrypt --key foo 682bc583f4641835fa2db009355293665d2647dade3375c0ee201de2a49f7bda
    mysecret

To use a key in a file (e.g. an RSA public key for encyption) prepend the key value with "@" and provide the file path, e.g.

    $ spring encrypt mysecret --key @${HOME}/.ssh/id_rsa.pub
    AQAjPgt3eFZQXwt8tsHAVv/QHiY5sI2dRcR+...