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Running the API Mediation Layer on Local Machine

The API Mediation Layer can run on a z/OS system or on your local machine (Mac/Linux/Windows).

The default settings for running on local machine are stored in the /config/local/ directory.

npm is used to launch services. For Java command line, check package.json in root folder.

To start each server individually with default settings for running on your local machine, run the following statements.

Build first!

./gradlew build

Gateway Service

npm run gateway-service-thin

HTTPS

By default, the Gateway runs in encrypted mode (HTTPS) for northbound traffic using signed certificates in Java keystore.

To override this and run the Gateway without TLS encryption, add the following two arguments to java command:

-Denvironment.scheme=http -Denvironment.sslEnabled=false

The source code contains sample certificates that are used by configuration for testing on your local machine. Do not use these certificates in other environments. More details can be found at /keystore/README.md.

Discovery Service

Note: If you want to run the Discovery Service using IntelliJ Run Dashboard, you need to add https in the Active profiles field in Edit Configuration.

npm run discovery-service-thin

API Catalog

npm run api-catalog-service-thin

Caching API

npm run caching-service

Mock Services

npm run mock-services

Sample Application - Discoverable Client

npm run discoverable-client

Sample Application - onboarding-enabler-spring-sample-app

npm run onboarding-enabler-spring-sample-app

Sample Application - onboarding-enabler-nodejs-sample-app

To run onboarding-enabler-nodejs-sample-app, follow the steps below:

  1. Run npm run onboarding-enabler-nodejs-sample-app from the root project directory.

    1. Navigate to https://localhost:10011 and check if the service HWEXPRESS is registered to the Discovery Service. You should be able to reach the following endpoints using HTTPS:

      Go to the API Catalog and check if the API documentation of the service is retrieved.

Default Discovery Timing Settings

Default timings can require up to 3 minutes for service startup, discovery, and shutdown to be registered. To change settings so services register/de-register quicker, then append the following to the existing arguments:

-Deureka.instance.leaseExpirationDurationInSeconds=6 
-Deureka.instance.leaseRenewalIntervalInSeconds=5 
-Deureka.client.registryFetchIntervalSeconds=5 
-Deureka.client.initialInstanceInfoReplicationIntervalSeconds=5

These settings are for development purposes only, it may result in false positive or unexpected behaviour.

Default API Catalog Refresh/Cache update Timing Settings (UI only)

To increase the service cache frequency rate which updates the Catalog UI with discovered service statuses:

-Dapiml.service-registry.serviceFetchDelayInMillis=10000 
-Dapiml.service-registry.cacheRefreshUpdateThresholdInMillis=10000 
-Dapiml.service-registry.cacheRefreshInitialDelayInMillis=10000 
-Dapiml.service-registry.cacheRefreshRetryDelayInMillis=10000

These settings are for development purposes only, it may result in false positive or unexpected behaviour.

Debugging

To turn on debugging messages for Zowe and informational messages for third-party dependencies:

--spring.profiles.active=dev

To turn on SSL/TLS protocol debugging:

-Djavax.net.debug=ssl:handshake

IntelliJ Idea setup

If your editor of choice happens to be Idea and you want to use its 'Run Dashboard' refer to Intellij Idea Setup.

Running multiple instances of Eureka locally

To run multiple instances of Eureka from your local environment follow these steps:

  1. Open the hosts file located inside C:\Windows\System32\drivers\etc directory as Administrator and add one or more virtual ip – hostname entries to allow discovery peers on your laptop.

    Example: 127.0.0.2 localhost1 127.0.0.3 localhost2

    • On Mac, this can be done by editing /etc/hosts file as the root:

        `sudo nano /etc/hosts`

      Add: 127.0.0.2 localhost2 127.0.0.3 localhost3

      Activate:

        `dscacheutil -flushcache; sudo killall -HUP mDNSResponder`

      Add virtual local network adapter on Mac:

        ```
  sudo ifconfig lo0 alias 127.0.0.2
  sudo ifconfig lo0 alias 127.0.0.3
  ```

      It can be removed issuing: ifconfig lo0 -alias 127.0.0.2

  2. Modify the discovery-service.yml and change the values of discoveryLocations, hostname, ipAddress and port as in the example below:

    Example:

    environment:
    cacheRefreshDelayInMillis: 10000
    discoveryLocations: http://eureka:password@discoveryInstance1:10022/eureka,http://eureka:password@discoveryInstance2:10033/eureka
    dsIpAddress: 0.0.0.0
    eurekaPassword: password
    eurekaUserName: eureka
    hostname: discoveryInstance1
    initialCacheRefreshDelayInMillis: 10000
    ipAddress: 127.0.0.2
    port: 10022
    preferIpAddress: false
    registryServiceInitialDelayInSeconds: 10
    registryServiceRetryDelayInSeconds: 5
    truststore: keystore/local/localhost_truststore.jks
    truststorePassword: trustword
    truststoreType: JKS
    updateThresholdInMillis: 10000

spring:
    output:
        ansi:
            enabled: always

  3. Run the DiscoveryServiceApplication and once it's up, modify the .yml file again changing hostname, ipAddress and port with the values chosen for the other peer.

    • Without IntelliJ IDEA, you can run npm run api-layer-multi to run all the services from JARs. This task starts two Discovery Services with other API Mediation Layer services using configuration file in config/local-multi.

  4. Run DiscoveryServiceApplication again.

  5. Go to 127.0.0.x:yyyyy check the multiple instances registered with each other. If this was successful, the registered-replicas and available-replicas fields will contain the URL(s) of the other instance(s) of Eureka that you've created in the previous steps.

Note: This configuration will work when the preferIpAddress parameter is set to false. If you set it to true, you need to modify the value of discoveryLocations: to use IP address instead of hostname, otherwise Eureka won't be able to find the services registered and as consequence the available-replicas will be empty.

Example: discoveryLocations: http://eureka:[email protected]:10022/eureka,http://eureka:[email protected]:10033/eureka instead of discoveryLocations: http://eureka:password@discoveryInstance1:10022/eureka,http://eureka:password@discoveryInstance2:10033/eureka

Ports Used

This is a list of default ports used by the project for development:

SERVICE PORT
Gateway 10010
Discovery Service 10011
Discoverable client 10012
Mock Services 10013
API Catalog 10014
EnablerJavaSampleApp 10016