SNRK-57: Fix internals

snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/s3/S3Directory.kt

@@ -1,18 +1,19 @@
 package space.kscience.snark.storage.s3
 
 import aws.sdk.kotlin.services.s3.S3Client
-import space.kscience.snark.storage.Directory as Dir
+import space.kscience.snark.storage.Directory
 import space.kscience.snark.storage.FileReader
 import space.kscience.snark.storage.FileWriter
 import java.nio.file.Path
+import kotlin.io.path.*
 
-public class Directory(
+internal class S3Directory(
     private val client: S3Client,
     private val bucketName: String,
-    private val currentDir: String,
-) : Dir {
+    private val currentDir: Path,
+) : Directory {
     override suspend fun get(filename: String): FileReader = run {
-        S3FileReader(client, bucketName, "$currentDir/$filename")
+        S3FileReader(client, bucketName, currentDir / filename)
     }
 
     override suspend fun create(filename: String, ignoreIfExists: Boolean) {
@@ -21,19 +22,17 @@ public class Directory(
         }
     }
 
-    override suspend fun put(filename: String): FileWriter = run {
-        S3FileWriter(client, bucketName, "$currentDir/$filename")
-    }
+    override suspend fun put(filename: String): FileWriter =
+        S3FileWriter(client, bucketName, currentDir / filename)
 
-    override suspend fun getSubdir(path: Path): Directory = run {
-        Directory(client, bucketName, "$currentDir/$path")
-    }
+    override suspend fun getSubdir(path: Path): S3Directory =
+        S3Directory(client, bucketName, currentDir / path)
 
-    override suspend fun createSubdir(dirname: String, ignoreIfExists: Boolean): Directory = run {
+    override suspend fun createSubdir(dirname: String, ignoreIfExists: Boolean): S3Directory = run {
         if (!ignoreIfExists) {
             throw IllegalArgumentException("could not check if directory exists")
         }
-        Directory(client, bucketName, "$currentDir/$dirname")
+        S3Directory(client, bucketName, currentDir / dirname)
     }
 
     override fun close() {

snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/s3/S3File.kt

@@ -7,12 +7,14 @@ import aws.smithy.kotlin.runtime.content.ByteStream
 import aws.smithy.kotlin.runtime.content.toByteArray
 import space.kscience.snark.storage.FileReader
 import space.kscience.snark.storage.FileWriter
+import java.nio.file.Path
+import kotlin.io.path.*
 
-public class S3FileReader(private val client: S3Client, private val bucketName: String, private val fullQualifiedPath: String) : FileReader {
+internal class S3FileReader(private val client: S3Client, private val bucketName: String, private val path: Path) : FileReader {
     override suspend fun readAll(): ByteArray {
         val result = client.getObject(GetObjectRequest{
             bucket = bucketName
-            key = fullQualifiedPath
+            key = path.toString()
         }) {
             it.body?.toByteArray() ?: ByteArray(0)
         }
@@ -23,11 +25,11 @@ public class S3FileReader(private val client: S3Client, private val bucketName:
     }
 }
 
-public class S3FileWriter(private val client: S3Client, private val bucketName: String, private val fullQualifiedPath: String) : FileWriter {
+internal class S3FileWriter(private val client: S3Client, private val bucketName: String, private val path: Path) : FileWriter {
     override suspend fun write(bytes: ByteArray) {
         client.putObject {
             bucket = bucketName
-            key = fullQualifiedPath
+            key = path.toString()
             body = ByteStream.fromBytes(bytes)
         }
     }

snark-storage-driver/src/main/kotlin/space/kscience/snark/storage/s3/S3Root.kt

@@ -1,20 +1,35 @@
 package space.kscience.snark.storage.s3
 
 import aws.sdk.kotlin.services.s3.*
-import space.kscience.snark.storage.Directory as Dir
+import space.kscience.snark.storage.Directory
 import space.kscience.snark.storage.FileReader
 import space.kscience.snark.storage.FileWriter
 import java.io.File
 import java.lang.Exception
 import java.nio.file.Path
+import kotlin.io.path.*
 
-public class Root(private val client: S3Client) : Dir {
+public fun s3Storage(client: S3Client): Directory {
+    return S3Root(client)
+}
+
+public fun s3Bucket(client: S3Client, bucket: String): Directory {
+    return S3Directory(client, bucket, Path(""))
+}
+
+internal fun splitPathIntoBucketAndPath(path: Path): Pair<String, Path> {
+    val bucket = path.getName(0)
+    val recent = path.relativize(bucket)
+    return Pair(bucket.toString(), recent)
+}
+
+internal class S3Root(private val client: S3Client) : Directory {
     override suspend fun get(filename: String): FileReader {
         throw NoSuchFileException(File(filename))
     }
 
     override suspend fun create(filename: String, ignoreIfExists: Boolean) {
-        throw IllegalCallerException()
+        throw NoSuchFileException(File(filename))
     }
 
     override suspend fun put(filename: String): FileWriter {
@@ -22,20 +37,21 @@ public class Root(private val client: S3Client) : Dir {
     }
 
     override suspend fun getSubdir(path: Path): Directory = try {
-        val bucketName = path.toString()
+        val (bucketName, recentPath) = splitPathIntoBucketAndPath(path)
         client.headBucket {
             bucket = bucketName
         }
-        Directory(client, bucketName, "")
+        S3Directory(client, bucketName, recentPath)
     } catch (ex: Exception) {
         throw java.nio.file.AccessDeniedException(path.toString()).initCause(ex)
     }
 
     override suspend fun createSubdir(dirname: String, ignoreIfExists: Boolean): Directory = try {
+        val (bucketName, recentPath) = splitPathIntoBucketAndPath(Path(dirname))
         client.createBucket {
-            bucket = dirname
+            bucket = bucketName
         }
-        Directory(client, dirname, "")
+        S3Directory(client, bucketName, recentPath)
     } catch (ex: Exception) {
         throw java.nio.file.AccessDeniedException(dirname).initCause(ex)
     }