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package xyz.driver.core
package init
import java.nio.file.Paths
import xyz.driver.core.discovery.CanDiscoverService
import xyz.driver.core.messaging.{GoogleBus, QueueBus, StreamBus}
import xyz.driver.core.reporting._
import xyz.driver.core.reporting.ScalaLoggerLike.defaultScalaLogger
import xyz.driver.core.storage.{BlobStorage, FileSystemBlobStorage, GcsBlobStorage}
import scala.concurrent.ExecutionContext
/** Mixin trait that provides essential cloud utilities. */
trait CloudServices extends AkkaBootable { self =>
/** The platform that this application is running on.
* @group config
*/
def platform: Platform = Platform.current
/** Service discovery for the current platform.
*
* Define a service trait and companion object:
* {{{
* trait MyService {
* def call(): Int
* }
* object MyService {
* implicit val isDiscoverable = new xyz.driver.core.discovery.CanDiscoverService[MyService] {
* def discover(p: xyz.driver.core.Platform): MyService = new MyService {
* def call() = 42
* }
* }
* }
* }}}
*
* Then discover and use it:
* {{{
* discover[MyService].call()
* }}}
*
* @group utilities
*/
def discover[A](implicit cds: CanDiscoverService[A]): A = cds.discover(platform)
/* TODO: this reporter uses the platform to determine if JSON logging should be enabled.
* Since the default logger uses slf4j, its settings must be specified before a logger
* is first accessed. This in turn leads to somewhat convoluted code,
* since we can't log when the platform being is determined.
* A potential fix would be to make the log format independent of the platform, and always log
* as JSON for example.
*/
override lazy val reporter: Reporter with ScalaLoggerLike = {
Console.println("determining platform") // scalastyle:ignore
val r = platform match {
case p @ Platform.GoogleCloud(_, _) =>
new GoogleReporter(p.credentials, p.namespace, defaultScalaLogger(true))
case Platform.Dev =>
new NoTraceReporter(defaultScalaLogger(false))
}
r.info(s"application started on platform '${platform}'")(SpanContext.fresh())
r
}
/** Object storage.
* @group utilities
*/
def storage(bucketId: String): BlobStorage =
platform match {
case Platform.GoogleCloud(keyfile, _) =>
GcsBlobStorage.fromKeyfile(keyfile, bucketId)
case Platform.Dev =>
new FileSystemBlobStorage(Paths.get(s".data-$bucketId"))
}
/** Message bus.
* @group utilities
*/
def messageBus: StreamBus = platform match {
case Platform.GoogleCloud(keyfile, namespace) => GoogleBus.fromKeyfile(keyfile, namespace)
case Platform.Dev =>
new QueueBus()(self.system) with StreamBus {
override def executionContext: ExecutionContext = self.executionContext
}
}
}
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