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/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc
import java.io.{ IOException, FileNotFoundException, PrintWriter, FileOutputStream }
import java.io.{ BufferedReader, FileReader }
import java.util.regex.Pattern
import java.net._
import java.security.SecureRandom
import scala.io.{ File, Path }
import scala.util.control.Exception.catching
// class CompileChannel { }
/** This class manages sockets for the fsc offline compiler. */
class CompileSocket {
protected def compileClient: StandardCompileClient = CompileClient //todo: lazy val
/** The prefix of the port identification file, which is followed
* by the port number.
*/
protected def dirName = "scalac-compile-server-port" //todo: lazy val
protected def cmdName = Properties.cmdName //todo: lazy val
/** The vm part of the command to start a new scala compile server */
protected val vmCommand = Properties.scalaHome match {
case null => cmdName
case dirname =>
val trial = File(dirname) / "bin" / cmdName
if (trial.canRead) trial.path
else cmdName
}
/** The class name of the scala compile server */
protected val serverClass = "scala.tools.nsc.CompileServer"
/** A regular expression for checking compiler output for errors */
val errorRegex = ".*(errors? found|don't know|bad option).*"
/** A Pattern object for checking compiler output for errors */
val errorPattern = Pattern compile errorRegex
protected def error(msg: String) = System.err.println(msg)
protected def fatal(msg: String) = {
error(msg)
throw new Exception("fsc failure")
}
protected def info(msg: String) =
if (compileClient.verbose) System.out.println(msg)
/** A temporary directory to use */
val tmpDir = {
val udir = Option(Properties.userName) getOrElse "shared"
val f = (Path(Properties.tmpDir) / "scala-devel" / udir).createDirectory()
if (f.isDirectory && f.canWrite) {
info("[Temp directory: " + f + "]")
f
}
else fatal("Could not find a directory for temporary files")
}
/* A directory holding port identification files */
val portsDir = (tmpDir / dirName).createDirectory
/** Maximum number of polls for an available port */
private val MaxAttempts = 100
/** Time (in ms) to sleep between two polls */
private val sleepTime = 20
/** The command which starts the compile server, given vm arguments.
*
* @param vmArgs the argument string to be passed to the java or scala command
* the string must be either empty or start with a ' '.
*/
private def serverCommand(vmArgs: String): String =
vmCommand + vmArgs + " " + serverClass
/** Start a new server; returns true iff it succeeds */
private def startNewServer(vmArgs: String) {
val cmd = serverCommand(vmArgs)
info("[Executed command: " + cmd + "]")
try {
Runtime.getRuntime().exec(cmd)
// val exitVal = proc.waitFor()
// info("[Exit value: " + exitVal + "]")
} catch {
case ex: IOException =>
fatal("Cannot start compilation daemon." +
"\ntried command: " + cmd)
}
}
/** The port identification file */
def portFile(port: Int) = portsDir / File(port.toString)
/** Poll for a server port number; return -1 if none exists yet */
private def pollPort(): Int =
portsDir.list.toList match {
case Nil => -1
case p :: xs =>
xs forall (_.delete())
p.name.toInt
}
/** Get the port number to which a scala compile server is connected;
* If no server is running yet, then create one.
*/
def getPort(vmArgs: String): Int = {
var attempts = 0
var port = pollPort()
if (port < 0)
startNewServer(vmArgs)
while (port < 0 && attempts < MaxAttempts) {
attempts += 1
Thread.sleep(sleepTime)
port = pollPort()
}
info("[Port number: " + port + "]")
if (port < 0)
fatal("Could not connect to compilation daemon.")
port
}
/** Set the port number to which a scala compile server is connected */
def setPort(port: Int) {
val file = portFile(port)
val secret = new SecureRandom().nextInt.toString
try file writeAll List(secret) catch {
case e @ (_: FileNotFoundException | _: SecurityException) =>
fatal("Cannot create file: %s".format(file.path))
}
}
/** Delete the port number to which a scala compile server was connected */
def deletePort(port: Int) = portFile(port).delete()
/** Get a socket connected to a daemon. If create is true, then
* create a new daemon if necessary. Returns null if the connection
* cannot be established.
*/
def getOrCreateSocket(vmArgs: String, create: Boolean = true): Socket = {
val nAttempts = 49 // try for about 5 seconds
def getsock(attempts: Int): Socket =
if (attempts == 0) {
error("Unable to establish connection to compilation daemon")
null
} else {
val port = if(create) getPort(vmArgs) else pollPort()
if(port < 0) return null
val hostAdr = InetAddress.getLocalHost()
try {
val result = new Socket(hostAdr, port)
info("[Connected to compilation daemon at port " + port + "]")
result
} catch {
case e: /*IO+Security*/Exception =>
info(e.toString)
info("[Connecting to compilation daemon at port " +
port + " failed; re-trying...]")
if (attempts % 2 == 0)
portFile(port).delete // 50% chance to stop trying on this port
Thread.sleep(100) // delay before retrying
getsock(attempts - 1)
}
}
getsock(nAttempts)
}
// XXX way past time for this to be central
def parseInt(x: String): Option[Int] =
try { Some(x.toInt) }
catch { case _: NumberFormatException => None }
def getSocket(serverAdr: String): Socket = {
def fail = fatal("Malformed server address: %s; exiting" format serverAdr)
(serverAdr indexOf ':') match {
case -1 => fail
case cpos =>
val hostName: String = serverAdr take cpos
parseInt(serverAdr drop (cpos + 1)) match {
case Some(port) => getSocket(hostName, port)
case _ => fail
}
}
}
def getSocket(hostName: String, port: Int): Socket =
try new Socket(hostName, port) catch {
case e @ (_: IOException | _: SecurityException) =>
fatal("Unable to establish connection to server %s:%d; exiting".format(hostName, port))
}
def getPassword(port: Int): String = {
val ff = portFile(port)
val f = ff.bufferedReader()
// allow some time for the server to start up
def check = {
Thread sleep 100
ff.length
}
if (Iterator continually check take 50 find (_ > 0) isEmpty) {
ff.delete()
fatal("Unable to establish connection to server.")
}
val result = f.readLine()
f.close()
result
}
}
object CompileSocket extends CompileSocket
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