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package mill.main
import java.io._
import java.net.Socket
import mill.Main
import org.scalasbt.ipcsocket._
import mill.client._
import mill.eval.Evaluator
import mill.util.DummyInputStream
trait ServerMain[T]{
var stateCache = Option.empty[T]
def main0(args: Array[String],
stateCache: Option[T],
mainInteractive: Boolean,
stdin: InputStream,
stdout: PrintStream,
stderr: PrintStream): (Boolean, Option[T])
}
object ServerMain extends mill.main.ServerMain[Evaluator.State]{
def main(args0: Array[String]): Unit = {
new Server(
args0(0),
this,
() => System.exit(0),
300000,
mill.client.Locks.files(args0(0))
).run()
}
def main0(args: Array[String],
stateCache: Option[Evaluator.State],
mainInteractive: Boolean,
stdin: InputStream,
stdout: PrintStream,
stderr: PrintStream) = Main.main0(
args,
stateCache,
mainInteractive,
DummyInputStream,
stdout,
stderr
)
}
class Server[T](lockBase: String,
sm: ServerMain[T],
interruptServer: () => Unit,
acceptTimeout: Int,
locks: Locks) {
val originalStdout = System.out
def run() = {
Server.tryLockBlock(locks.processLock){
var running = true
while (running) {
Server.lockBlock(locks.serverLock){
val (serverSocket, socketClose) = if (ClientServer.isWindows) {
val socketName = ClientServer.WIN32_PIPE_PREFIX + new File(lockBase).getName
(new Win32NamedPipeServerSocket(socketName), () => new Win32NamedPipeSocket(socketName).close())
} else {
val socketName = lockBase + "/io"
new File(socketName).delete()
(new UnixDomainServerSocket(socketName), () => new UnixDomainSocket(socketName).close())
}
val sockOpt = Server.interruptWith(
acceptTimeout,
socketClose(),
serverSocket.accept()
)
sockOpt match{
case None => running = false
case Some(sock) =>
try {
handleRun(sock)
serverSocket.close()
}
catch{case e: Throwable => e.printStackTrace(originalStdout) }
}
}
// Make sure you give an opportunity for the client to probe the lock
// and realize the server has released it to signal completion
Thread.sleep(10)
}
}.getOrElse(throw new Exception("PID already present"))
}
def handleRun(clientSocket: Socket) = {
val currentOutErr = clientSocket.getOutputStream
val socketIn = clientSocket.getInputStream
val argStream = new FileInputStream(lockBase + "/run")
val interactive = argStream.read() != 0;
val args = ClientServer.parseArgs(argStream)
argStream.close()
var done = false
val t = new Thread(() =>
try {
val stdout = new PrintStream(new ProxyOutputStream(currentOutErr, 0), true)
val stderr = new PrintStream(new ProxyOutputStream(currentOutErr, 1), true)
val (result, newStateCache) = sm.main0(
args,
sm.stateCache,
interactive,
socketIn,
stdout, stderr
)
sm.stateCache = newStateCache
java.nio.file.Files.write(
java.nio.file.Paths.get(lockBase + "/exitCode"),
(if (result) 0 else 1).toString.getBytes
)
} catch{case WatchInterrupted(sc: Option[T]) =>
sm.stateCache = sc
} finally{
done = true
}
)
t.start()
// We cannot simply use Lock#await here, because the filesystem doesn't
// realize the clientLock/serverLock are held by different threads in the
// two processes and gives a spurious deadlock error
while(!done && !locks.clientLock.probe()) {
Thread.sleep(3)
}
if (!done) interruptServer()
t.interrupt()
t.stop()
if (ClientServer.isWindows) {
// Closing Win32NamedPipeSocket can often take ~5s
// It seems OK to exit the client early and subsequently
// start up mill client again (perhaps closing the server
// socket helps speed up the process).
val t = new Thread(() => clientSocket.close())
t.setDaemon(true)
t.start()
} else clientSocket.close()
}
}
object Server{
def lockBlock[T](lock: Lock)(t: => T): T = {
val l = lock.lock()
try t
finally l.release()
}
def tryLockBlock[T](lock: Lock)(t: => T): Option[T] = {
lock.tryLock() match{
case null => None
case l =>
try Some(t)
finally l.release()
}
}
def interruptWith[T](millis: Int, close: => Unit, t: => T): Option[T] = {
@volatile var interrupt = true
@volatile var interrupted = false
new Thread(() => {
Thread.sleep(millis)
if (interrupt) {
interrupted = true
close
}
}).start()
try {
val res =
try Some(t)
catch {case e: Throwable => None}
if (interrupted) None
else res
} finally {
interrupt = false
}
}
}
class ProxyOutputStream(x: => java.io.OutputStream,
key: Int) extends java.io.OutputStream {
override def write(b: Int) = x.synchronized{
x.write(key)
x.write(b)
}
}
class ProxyInputStream(x: => java.io.InputStream) extends java.io.InputStream{
def read() = x.read()
override def read(b: Array[Byte], off: Int, len: Int) = x.read(b, off, len)
override def read(b: Array[Byte]) = x.read(b)
}
case class WatchInterrupted[T](stateCache: Option[T]) extends Exception
|
