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ExecutorClassLoader.scala
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ExecutorClassLoader.scala
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.repl
import java.io.{IOException, ByteArrayOutputStream, InputStream}
import java.net.{HttpURLConnection, URI, URL, URLEncoder}
import scala.util.control.NonFatal
import org.apache.hadoop.fs.{FileSystem, Path}
import org.apache.xbean.asm5._
import org.apache.xbean.asm5.Opcodes._
import org.apache.spark.{SparkConf, SparkEnv, Logging}
import org.apache.spark.deploy.SparkHadoopUtil
import org.apache.spark.util.Utils
import org.apache.spark.util.ParentClassLoader
/**
* A ClassLoader that reads classes from a Hadoop FileSystem or HTTP URI,
* used to load classes defined by the interpreter when the REPL is used.
* Allows the user to specify if user class path should be first
*/
class ExecutorClassLoader(conf: SparkConf, classUri: String, parent: ClassLoader,
userClassPathFirst: Boolean) extends ClassLoader with Logging {
val uri = new URI(classUri)
val directory = uri.getPath
val parentLoader = new ParentClassLoader(parent)
// Allows HTTP connect and read timeouts to be controlled for testing / debugging purposes
private[repl] var httpUrlConnectionTimeoutMillis: Int = -1
// Hadoop FileSystem object for our URI, if it isn't using HTTP
var fileSystem: FileSystem = {
if (Set("http", "https", "ftp").contains(uri.getScheme)) {
null
} else {
FileSystem.get(uri, SparkHadoopUtil.get.newConfiguration(conf))
}
}
override def findClass(name: String): Class[_] = {
userClassPathFirst match {
case true => findClassLocally(name).getOrElse(parentLoader.loadClass(name))
case false => {
try {
parentLoader.loadClass(name)
} catch {
case e: ClassNotFoundException => {
val classOption = findClassLocally(name)
classOption match {
case None => throw new ClassNotFoundException(name, e)
case Some(a) => a
}
}
}
}
}
}
private def getClassFileInputStreamFromHttpServer(pathInDirectory: String): InputStream = {
val url = if (SparkEnv.get.securityManager.isAuthenticationEnabled()) {
val uri = new URI(classUri + "/" + urlEncode(pathInDirectory))
val newuri = Utils.constructURIForAuthentication(uri, SparkEnv.get.securityManager)
newuri.toURL
} else {
new URL(classUri + "/" + urlEncode(pathInDirectory))
}
val connection: HttpURLConnection = Utils.setupSecureURLConnection(url.openConnection(),
SparkEnv.get.securityManager).asInstanceOf[HttpURLConnection]
// Set the connection timeouts (for testing purposes)
if (httpUrlConnectionTimeoutMillis != -1) {
connection.setConnectTimeout(httpUrlConnectionTimeoutMillis)
connection.setReadTimeout(httpUrlConnectionTimeoutMillis)
}
connection.connect()
try {
if (connection.getResponseCode != 200) {
// Close the error stream so that the connection is eligible for re-use
try {
connection.getErrorStream.close()
} catch {
case ioe: IOException =>
logError("Exception while closing error stream", ioe)
}
throw new ClassNotFoundException(s"Class file not found at URL $url")
} else {
connection.getInputStream
}
} catch {
case NonFatal(e) if !e.isInstanceOf[ClassNotFoundException] =>
connection.disconnect()
throw e
}
}
private def getClassFileInputStreamFromFileSystem(pathInDirectory: String): InputStream = {
val path = new Path(directory, pathInDirectory)
if (fileSystem.exists(path)) {
fileSystem.open(path)
} else {
throw new ClassNotFoundException(s"Class file not found at path $path")
}
}
def findClassLocally(name: String): Option[Class[_]] = {
val pathInDirectory = name.replace('.', '/') + ".class"
var inputStream: InputStream = null
try {
inputStream = {
if (fileSystem != null) {
getClassFileInputStreamFromFileSystem(pathInDirectory)
} else {
getClassFileInputStreamFromHttpServer(pathInDirectory)
}
}
val bytes = readAndTransformClass(name, inputStream)
Some(defineClass(name, bytes, 0, bytes.length))
} catch {
case e: ClassNotFoundException =>
// We did not find the class
logDebug(s"Did not load class $name from REPL class server at $uri", e)
None
case e: Exception =>
// Something bad happened while checking if the class exists
logError(s"Failed to check existence of class $name on REPL class server at $uri", e)
None
} finally {
if (inputStream != null) {
try {
inputStream.close()
} catch {
case e: Exception =>
logError("Exception while closing inputStream", e)
}
}
}
}
def readAndTransformClass(name: String, in: InputStream): Array[Byte] = {
if (name.startsWith("line") && name.endsWith("$iw$")) {
// Class seems to be an interpreter "wrapper" object storing a val or var.
// Replace its constructor with a dummy one that does not run the
// initialization code placed there by the REPL. The val or var will
// be initialized later through reflection when it is used in a task.
val cr = new ClassReader(in)
val cw = new ClassWriter(
ClassWriter.COMPUTE_FRAMES + ClassWriter.COMPUTE_MAXS)
val cleaner = new ConstructorCleaner(name, cw)
cr.accept(cleaner, 0)
return cw.toByteArray
} else {
// Pass the class through unmodified
val bos = new ByteArrayOutputStream
val bytes = new Array[Byte](4096)
var done = false
while (!done) {
val num = in.read(bytes)
if (num >= 0) {
bos.write(bytes, 0, num)
} else {
done = true
}
}
return bos.toByteArray
}
}
/**
* URL-encode a string, preserving only slashes
*/
def urlEncode(str: String): String = {
str.split('/').map(part => URLEncoder.encode(part, "UTF-8")).mkString("/")
}
}
class ConstructorCleaner(className: String, cv: ClassVisitor)
extends ClassVisitor(ASM5, cv) {
override def visitMethod(access: Int, name: String, desc: String,
sig: String, exceptions: Array[String]): MethodVisitor = {
val mv = cv.visitMethod(access, name, desc, sig, exceptions)
if (name == "<init>" && (access & ACC_STATIC) == 0) {
// This is the constructor, time to clean it; just output some new
// instructions to mv that create the object and set the static MODULE$
// field in the class to point to it, but do nothing otherwise.
mv.visitCode()
mv.visitVarInsn(ALOAD, 0) // load this
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false)
mv.visitVarInsn(ALOAD, 0) // load this
// val classType = className.replace('.', '/')
// mv.visitFieldInsn(PUTSTATIC, classType, "MODULE$", "L" + classType + ";")
mv.visitInsn(RETURN)
mv.visitMaxs(-1, -1) // stack size and local vars will be auto-computed
mv.visitEnd()
return null
} else {
return mv
}
}
}