Move platform back into init and use a configurable DNS discovery

1 files changed, 31 insertions, 0 deletions

diff --git a/src/main/scala/xyz/driver/core/init/Platform.scala b/src/main/scala/xyz/driver/core/init/Platform.scala
new file mode 100644
index 0000000..2daa2c8
--- /dev/null
+++ b/src/main/scala/xyz/driver/core/init/Platform.scala
@@ -0,0 +1,31 @@
+package xyz.driver.core
+package init
+
+import java.nio.file.{Files, Path, Paths}
+
+import com.google.auth.oauth2.ServiceAccountCredentials
+
+sealed trait Platform
+object Platform {
+  case class GoogleCloud(keyfile: Path, namespace: String) extends Platform {
+    def credentials: ServiceAccountCredentials = ServiceAccountCredentials.fromStream(
+      Files.newInputStream(keyfile)
+    )
+    def project: String = credentials.getProjectId
+  }
+  // case object AliCloud   extends Platform
+  case object Dev extends Platform
+
+  lazy val fromEnv: Platform = {
+    def isGoogle = sys.env.get("GOOGLE_APPLICATION_CREDENTIALS").map { value =>
+      val keyfile = Paths.get(value)
+      require(Files.isReadable(keyfile), s"Google credentials file $value is not readable.")
+      val namespace = sys.env.getOrElse("SERVICE_NAMESPACE", sys.error("Namespace not set"))
+      GoogleCloud(keyfile, namespace)
+    }
+    isGoogle.getOrElse(Dev)
+  }
+
+  def current: Platform = fromEnv
+
+}