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package xyz.driver.core.file
import java.io.{BufferedOutputStream, File, FileInputStream, FileOutputStream}
import java.nio.file.{Path, Paths}
import com.google.cloud.storage.Storage.BlobListOption
import com.google.cloud.storage._
import xyz.driver.core.time.Time
import xyz.driver.core.{Name, Revision, generators}
import scala.collection.JavaConverters._
import scala.concurrent.{ExecutionContext, Future}
import scalaz.{ListT, OptionT}
class GcsStorage(storageClient: Storage, bucketName: Name[Bucket], executionContext: ExecutionContext)
extends FileStorage {
implicit private val execution: ExecutionContext = executionContext
override def upload(localSource: File, destination: Path): Future[Unit] = Future {
checkSafeFileName(destination) {
val blobId = BlobId.of(bucketName.value, destination.toString)
def acl = Bucket.BlobWriteOption.predefinedAcl(Storage.PredefinedAcl.PUBLIC_READ)
storageClient.get(bucketName.value).create(blobId.getName, new FileInputStream(localSource), acl)
}
}
override def download(filePath: Path): OptionT[Future, File] = {
OptionT.optionT(Future {
Option(storageClient.get(bucketName.value, filePath.toString)).filterNot(_.getSize == 0).map {
blob =>
val tempDir = System.getProperty("java.io.tmpdir")
val randomFolderName = generators.nextUuid().toString
val tempDestinationFile = new File(Paths.get(tempDir, randomFolderName, filePath.toString).toString)
if (!tempDestinationFile.getParentFile.mkdirs()) {
throw new Exception(s"Failed to create temp directory to download file `$tempDestinationFile`")
} else {
val target = new BufferedOutputStream(new FileOutputStream(tempDestinationFile))
try target.write(blob.getContent())
finally target.close()
tempDestinationFile
}
}
})
}
override def delete(filePath: Path): Future[Unit] = Future {
storageClient.delete(BlobId.of(bucketName.value, filePath.toString))
}
override def list(path: Path): ListT[Future, FileLink] =
ListT.listT(Future {
val page = storageClient.list(
bucketName.value,
BlobListOption.currentDirectory(),
BlobListOption.prefix(path.toString)
)
page.iterateAll().asScala.map(blobToFileLink(path, _)).toList
})
protected def blobToFileLink(path: Path, blob: Blob): FileLink = {
FileLink(
Name(blob.getName),
Paths.get(path.toString, blob.getName),
Revision(blob.getGeneration.toString),
Time(blob.getUpdateTime),
blob.getSize
)
}
}
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