GroovyServ - Technical Part
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This document provides technical details about GroovyServ, a Groovy script server. It describes how GroovyServ works as a server that listens on port 1961 for client connections using a RequestWorker. The client can send script code which is executed by the server and results returned. Details are given about the request and response formats, handling the current working directory, and using Maven to build and test GroovyServ.
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GroovyServ - Technical Part
- 2. groovyserver
- 5. based on: Ver 0.4-SNAPSHOT(7/24)
- 7. !"#$%&'()* based on: Ver 0.4-SNAPSHOT(7/24)
- 9. GroovyServer main()
- 10. ServerSocket Listen 1961
- 11. $ groovyclient -e “println(‘Hello, GroovyServ!’)” groovyclient 1961(default) groovyserver
- 12. RequestWorker start()
- 13. ClientConnection#openSession() InvocationRequest
- 14. groovyclient Groovy
- 15. Groovy
- 16. +,-./012345 67389:3467;5 <=6#+,4 based on: Ver 0.4-SNAPSHOT(7/24)
- 17. $ groovyserver
- 18. GroovyServer main()
- 21. ServerSocket Listen 1961
- 22. $ groovyclient -e “println(‘Hello, GroovyServ!’)” ./groovy/groovyserv/cookie Cookie groovyclient Cookie: 425ba835cb32688b1 1961(default) groovyserver
- 23. Socket Loopback Address RequestWorker
- 24. RequestWorker ClientConnection CientConnection ThreadGroup Singleton
- 25. RequestWorker start()
- 26. ClientConnection#openSession() InvocationRequest Cookie
- 27. groovyclient System.in
- 28. groovyclient Groovy
- 29. groovyclient (CWD) JVM 1. “user.dir” 2. JNA JVM CWD 3. CWD
- 30. GroovyMain GroovyMain2 Groovy
- 31. >?@A4BCDE3:2
- 32. - (CWD) CTRL+C
- 33. - (CWD) CTRL+C
- 34. - System.out(err) System.in HTTP
- 35. System.out(err) !script" println “Hello, GroovyServ!” Socket System.out OutputStream#write() ClientConnection (StreamResponse OutputStream) OutputStream ClientConnectionRepository groovyclient ThreadGroup ClientConnection if Channel ==”out” if Channel ==”err” " " Hello, GroovyServ!
- 36. groovyclient StreamRequestHandler Socket.inputStream.read() pipedOutputStream.write() ClientConnection PipedOutputStream ClientConnection Repository ThreadGroup ClientConnection PipedInputStream ClientConnection System.in PipedInputStream (StreamRequestInputStream) System.in !script" System.in.eachLine { ... }
- 37. Piped [ ] Size:-1 [ A] StreamRequestInputStream Socket#getInputStream() System.in [ B] StreamRequestInputStream PipedInputStream()
- 38. Request InvocationRequest Groovy StreamRequest Response StreamResponse
- 39. InvocationRequest 'Cwd:' <cwd> LF 'Arg:' <argn> LF 'Arg:' <arg1> LF 'Arg:' <arg2> LF 'Cp:' <classpath> LF 'Cookie:' <cookie> LF LF where: <cwd> is current working directory. <arg1><arg2>.. are commandline arguments(optional). <classpath>.. is the value of environment variable CLASSPATH(optional). <cookie> is authentication value which certify client is the user who invoked the server. LF is line feed (0x0a, 'n').
- 40. StreamRequest 'Size:' <size> LF LF <data from STDIN> where: <size> is the size of data to send to server. <size>==-1 means client exited. <data from STDIN> is byte sequence from standard input.
- 41. StreamResponse 'Status:' <status> LF 'Channel:' <id> LF 'Size:' <size> LF LF <data for STDERR/STDOUT> where: <status> is exit status of invoked groovy script. <id> is 'out' or 'err', where 'out' means standard output of the program. 'err' means standard error of the program. <size> is the size of chunk. <data from STDERR/STDOUT> is byte sequence from standard output/error.
- 42. - (CWD) CTRL+C
- 43. Cookie / Loopback only 2 Only from Loopback address InetAddress#isLoopbackAddress() Cookie Loopback address NG HTTP Cookie ~/.groovy/groovyserv/ cookie Cookie Authentication failed
- 44. - (CWD) CTRL+C
- 45. CLASSPATH CLASSPATH InvocationRequest Cp GroovyMain2 “groovy.classpath” GroovyMain2 groovy.classpath groovyserver -r -cp InvocationRequest Arg GroovyMain2
- 46. - (CWD) CTRL+C
- 47. CWD(Current Working Directory) Java GroovyServ CWD CWD $ cd /tmp $ groovyserver -r $ cd /home/kobo $ cat > hoge.txt HOGE!! ^C $ groovyclient -e ‘println(new File(“hoge.txt”).text)’ Caught: java.io.FileNotFoundException: hoge.txt (No such file or directory) ...SNIP...
- 48. “user.dir” File#getAbsolutePath() “"user.dir", which is initialized during jvm startup, should be used as an informative/readonly system property” posted 2008-08-18 http://bugs.sun.com/bugdatabase/view_bug.do;:YfiG?bug_id=4117557 JNA JVM CWD “user.dir” FileInputStream CWD Groovy
- 49. JNA cwd POM <dependency> <groupId>net.java.dev.jna</groupId> <artifactId>jna</artifactId> <version>3.2.2</version> </dependency> # OK import com.sun.jna.Library import com.sun.jna.Native import com.sun.jna.Platform interface CLibrary extends Library { String libname = (Platform.isWindows() ? "msvcrt" : "c") CLibrary INSTANCE = Native.loadLibrary(libname, CLibrary.class) int chdir(String dir) int _chdir(String dir) }
- 50. - (CWD) CTRL+C
- 51. groovyserver Windows groovyserver.bat PID Linux/MacOSX PID kill Windows Address already in use BAT PID
- 52. - (CWD) CTRL+C
- 53. CTRL+C groovyclient CTRL+C “Size: -1” StreamRequestHandler
- 54. - (CWD) CTRL+C
- 55. java.util.concurrent 2 StreamRequestHandler Groovy GroovyInvokeHandler
- 56. NW Groovy CTRL+C
- 57. System.exit() JVM
- 59. Maven + GMaven Maven + GMaven GMaven Gradle Gradle 0.4-SNAPSHOT groovy groovyc JDK API private IncompatibleClassChange Error
- 60. IntegrationTest GroovyServ groovyclient maven-failsafe-plugin “mvn integration- test” http://maven.apache.org/plugins/maven-failsafe-plugin/ index.html mvn
- 61. How to Build Maven2 $ cd groovyserv-<Version> $ mvn clean verify : target/groovyserv-<Version>-<OS>-<arch>-bin.zip Integration-Test target/groovyserv-<Version>-<OS>-<arch>.dir/groovyserv-<Version>-<OS>-<arch> : EncodeIT UTF-8 $ export _JAVA_OPTIONS=-Dfile.encoding=UTF-8 $ mvn -Dmaven.test.skip=true clean package Windows Cygwin gcc
- 62. >?:')DFFFF
- 63. Remote GroovyServ OFF Only Loopback adress Cookie
- 64. 3 groovyserver Loopback Address Cookie grovyclient “localhost”=> A groovyserver B groovyclient
- 66. GroovyServ GitHub clone/fork Welcome GroovyServ http://kobo.github.com/groovyserv GitHub http://github.com/kobo/groovyserv