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/*
* Copyright 2012 Taro L. Saito
*
* Licensed 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 wvlet.airframe.control
import java.io.File
import java.lang.management.ManagementFactory
import java.lang.reflect.Field
import wvlet.log.LogSupport
import scala.collection.JavaConverters._
import scala.collection.mutable.WeakHashMap
import scala.sys.process.{Process, ProcessLogger}
//--------------------------------------
//
// Shell.scala
// Since: 2012/02/06 10:02
//
//--------------------------------------
/**
* Launch UNIX (or cygwin) commands from Scala
* @author leo
*/
object Shell extends LogSupport {
private def access[U](f: Field)(body: => U): U = {
val a = f.isAccessible
try {
if (!a)
f.setAccessible(true)
body
} finally {
if (!a)
f.setAccessible(a)
}
}
/**
* Kills the process
* @param pid
* @return
*/
def kill(pid: Int, signal: String = "TERM"): Int = {
val p = launchProcess("kill -%s %d".format(signal, pid))
p.waitFor()
val exitCode = p.exitValue()
debug(s"killed process $pid with exit code $exitCode")
exitCode
}
/**
* Kill the process tree rooted from pid
* @param pid
* @return exit code
*/
def killTree(pid: Int, signal: String = "TERM"): Int = {
// stop the parent process first to keep it from forking another child process
exec(f"kill -STOP $pid%d")
// retrieve child processes
val pb = prepareProcessBuilder(s"ps -o pid -p $pid | sed 1d", inheritIO = true)
for (line <- Process(pb).lineStream_!) {
val childPID = line.trim.toInt
killTree(childPID, signal)
}
// Now send the signal
exec(s"kill -$signal $pid")
// Try and continue the process in case the signal is non-terminating
// but doesn't continue the process
exec(s"kill -CONT $pid")
}
def escape(s: String): String = {
val r = """([^\\])(\")""".r
val b = new StringBuilder
var cursor = 0
for (m <- r.findAllIn(s).matchData) {
b append s.substring(cursor, m.start)
b append m.group(2)
cursor = m.end
}
b append s.substring(cursor)
b.result
}
def unescape(s: String): String = {
val r = """(\\)([\\/\\"bfnrt])""".r
val b = new StringBuilder
var cursor = 0
for (m <- r.findAllIn(s).matchData) {
b append s.substring(cursor, m.start)
b append m.group(2)
cursor = m.end
}
b append s.substring(cursor)
b.result
}
/**
* launch a command in the remote host. The target host needs to be accessed
* via ssh command without password.
* @param host
* @param cmdLine
*/
def launchRemoteDaemon(host: String, cmdLine: String) {
execRemote(host, s"$cmdLine < /dev/null > /dev/null &")
}
/**
* Return the process ID of the current JVM.
*
* @return process id or -1 when process ID is not found.
*/
def getProcessIDOfCurrentJVM: Int = {
val r = ManagementFactory.getRuntimeMXBean
// This value is ought to be (process id)@(host name)
val n = r.getName
n.split("@").headOption.map { _.toInt } getOrElse { -1 }
}
/**
* Returns process id
* @param p
* @return process id or -1 if pid cannot be detected
*/
def getProcessID(p: java.lang.Process): Int = {
try {
// If the current OS is *Nix, the class of p is UNIXProcess and its pid can be obtained
// from pid field by using reflection.
val f = p.getClass().getDeclaredField("pid")
val pid: Int = access(f) {
f.get(p).asInstanceOf[Int]
}
pid
} catch {
case e: Throwable => -1
}
}
def launchJava(args: String) = {
val javaCmd = Shell.findJavaCommand()
if (javaCmd.isEmpty)
throw new IllegalStateException("No JVM is found. Set JAVA_HOME environmental variable")
val cmdLine = "%s %s".format(javaCmd.get, args)
launchProcess(cmdLine)
}
/**
* Launch a process then retrieves the exit code
* @param cmdLine
* @return
*/
def exec(cmdLine: String): Int = {
val pb = prepareProcessBuilder(cmdLine, inheritIO = true)
val exitCode = Process(pb).!(ProcessLogger { out: String =>
info(out)
})
debug(s"exec command $cmdLine with exitCode:$exitCode")
exitCode
}
def launchProcess(cmdLine: String) = {
val pb = prepareProcessBuilder(cmdLine, inheritIO = true)
val p = pb.start
debug(s"exec command [pid:${getProcessID(p)}] ${pb.command.asScala.mkString(" ")}")
p
}
def execRemote(hostname: String, cmdLine: String): Int = {
val pb = prepareProcessBuilderFromSeq(Seq("ssh", hostname, quote(cmdLine)), inheritIO = true)
val exitCode = Process(pb).!(ProcessLogger { out: String =>
info(out)
})
debug(s"exec command $cmdLine with exitCode:$exitCode")
exitCode
}
private def quote(s: String): String = {
s.replaceAll("""\"""", """\\"""")
}
def prepareProcessBuilder(cmdLine: String, inheritIO: Boolean): ProcessBuilder = {
trace(s"cmdLine: $cmdLine")
val tokens = Array(Shell.getCommand("sh"), "-c", if (OS.isWindows) quote(cmdLine) else cmdLine)
prepareProcessBuilderFromSeq(tokens, inheritIO)
}
def prepareProcessBuilderFromSeq(tokens: Seq[String], inheritIO: Boolean): ProcessBuilder = {
trace(s"command line tokens: ${tokens.mkString(", ")}")
val pb = new ProcessBuilder(tokens: _*)
if (inheritIO)
pb.inheritIO()
var env = getEnv
if (OS.isWindows)
env += ("CYGWIN" -> "notty")
val envMap = pb.environment()
env.foreach(e => envMap.put(e._1, e._2))
pb
}
def getEnv: Map[String, String] = {
System.getenv().asScala.toMap
}
def launchCmdExe(cmdLine: String) = {
val c = "%s /c \"%s\"".format(Shell.getCommand("cmd"), cmdLine)
debug(s"exec command: $c")
Process(CommandLineTokenizer.tokenize(c), None, getEnv.toSeq: _*).run
}
// command name -> path
private val cmdPathCache = new WeakHashMap[String, Option[String]]
def getCommand(name: String): String = {
findCommand(name) match {
case Some(cmd) => cmd
case None => throw new IllegalStateException("CommandTrait not found: %s".format(name))
}
}
def findSh: Option[String] = {
findCommand("sh")
}
def getExecPath = {
val path = (System.getenv("PATH") match {
case null => ""
case x => x.toString
}).split("[;:]")
path
}
/**
* Return OS-dependent program name. (e.g., sh in Unix, sh.exe in Windows)
*/
def progName(p: String) = {
if (OS.isWindows)
p + ".exe"
else
p
}
def findCommand(name: String): Option[String] = {
cmdPathCache.getOrElseUpdate(
name, {
val path = {
if (OS.isWindows)
getExecPath ++ Seq("c:/cygwin/bin")
else
getExecPath
}
val prog = progName(name)
val exe = path.map(new File(_, prog)).find(_.exists).map(_.getAbsolutePath)
trace {
if (exe.isDefined) "%s is found at %s".format(name, exe.get)
else "%s is not found".format(name)
}
exe
}
)
}
def sysProp(key: String): Option[String] = Option(System.getProperty(key))
def env(key: String): Option[String] = Option(System.getenv(key))
def findJavaHome: Option[String] = {
// lookup environment variable JAVA_HOME first.
// If JAVA_HOME is not defined, use java.home system property
val e: Option[String] = env("JAVA_HOME") orElse sysProp("java.home")
def resolveCygpath(p: String) = {
if (OS.isWindows) {
// If the path is for Cygwin environment
val m = """/cygdrive/(\w)(/.*)""".r.findFirstMatchIn(p)
if (m.isDefined)
"%s:%s".format(m.get.group(1), m.get.group(2))
else
p
} else
p
}
val p = e.map(resolveCygpath(_))
debug(s"Found JAVA_HOME=${p.get}")
p
}
def findJavaCommand(javaCmdName: String = "java"): Option[String] = {
def search: Option[String] = {
def javaBin(java_home: String) = java_home + "/bin/" + Shell.progName(javaCmdName)
def hasJavaCommand(java_home: String): Boolean = {
val java_path = new File(javaBin(java_home))
java_path.exists()
}
val java_home: Option[String] = {
val e = findJavaHome
import OSType._
e match {
case Some(x) => e
case None => {
def listJDKIn(path: String) = {
// TODO Oracle JVM (JRockit) support
new File(path)
.listFiles().filter(
x =>
x.isDirectory
&& (x.getName.startsWith("jdk") || x.getName.startsWith("jre"))
&& hasJavaCommand(x.getAbsolutePath)).map(_.getAbsolutePath)
}
def latestJDK(jdkPath: Array[String]): Option[String] = {
if (jdkPath.isEmpty)
None
else {
// TODO parse version number
val sorted = jdkPath.sorted.reverse
Some(sorted(0))
}
}
debug("No java command found. Searching for JDK...")
OS.getType match {
case Windows => latestJDK(listJDKIn("c:/Program Files/Java"))
case Mac => {
val l =
Seq("/System/Library/Frameworkds/JavaVM.framework/Home",
"/System/Library/Frameworkds/JavaVM.framework/Versions/CurrentJDK/Home").filter(hasJavaCommand)
if (l.isEmpty)
None
else
Some(l(0))
}
case _ => None
}
}
}
}
val ret: Option[String] = java_home match {
case Some(x) => Some(javaBin(x).trim)
case None => {
val javaPath = Process("which %s".format(javaCmdName)).!!.trim
if (javaPath.isEmpty)
None
else
Some(javaPath)
}
}
ret
}
cmdPathCache.getOrElseUpdate(javaCmdName, search)
}
}
