Prepare a multi-instance provisioning script

A multi-instance StackPack requires a provisioning script that is able to provision multiple StackPack instances. To achieve that, you need to provide a separate template file in the context for both stackPack and instance; stackPack needs to be provided with the shared-template.stj, and instance requires the instance-template.stj as in the example below:

Please note that instance-template.stj has some instance specific information, like topicName, instanceId and anything else defined in templateArguments, while shared-template passes without any specifics ([:]).

import com.stackstate.stackpack.ProvisioningScript
import com.stackstate.stackpack.ProvisioningContext
import com.stackstate.stackpack.ProvisioningIO
import com.stackstate.stackpack.Version
class Provision extends ProvisioningScript {
Provision(ProvisioningContext context) {
super(context)
}
@Override
ProvisioningIO<scala.Unit> install(Map<String, Object> config) {
def instance_url = instanceURL(config)
def templateArguments = [
'topicName': topicName(config),
'instance_url': instance_url,
'instanceId': context().instance().id()
]
templateArguments.putAll(config)
return context().stackPack().importSnapshot("templates/shared-template.stj", [:]) >>
context().instance().importSnapshot("templates/instance-template.stj", templateArguments)
}
@Override
ProvisioningIO<scala.Unit> upgrade(Map<String, Object> config, Version current) {
return install(config)
}
@Override
void waitingForData(Map<String, Object> config) {
context().sts().onDataReceived(topicName(config), {
context().sts().provisioningComplete()
})
}
private def topicName(Map<String, Object> exampleConfig) {
def instance_url = exampleConfig.test_instance_url
def topic = instance_url.replace("/", "_").replace(":", "_")
return context().sts().createTopologyTopicName("example", topic)
}
private def instanceURL(Map<String, Object> exampleConfig) {
def url = exampleConfig.test_instance_url
def instance_url = ''
if (url.startsWith('http') || url.startsWith('https')){
instance_url = url.split("//")[1].split("/")[0]
}
else{
instance_url = url.split("/")[0]
}
return instance_url
}
}

The last step is to prepare a StackPack .sts package and upload it to StackState.