wip

.gitattributes

@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+

.gitignore

@@ -0,0 +1,7 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+.vscode
+
+# Ignore Gradle build output directory
+build
+bin

build.gradle

@@ -0,0 +1,48 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/8.1.1/userguide/building_java_projects.html
+ */
+
+plugins {
+    // Apply the groovy plugin to also add support for Groovy (needed for Spock)
+    id 'groovy'
+
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.codehaus.groovy:groovy:3.0.13'
+    testImplementation 'org.spockframework:spock-core:2.2-groovy-3.0'
+    testImplementation 'junit:junit:4.13.2'
+
+    implementation 'org.slf4j:slf4j-api:2.0.7'
+    implementation 'ch.qos.logback:logback-classic:1.3.8'
+    implementation 'info.picocli:picocli:4.7.4'
+    annotationProcessor 'info.picocli:picocli-codegen:4.7.4'
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'biz.nellemann.jperf.App'
+}
+
+tasks.named('test') {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,245 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# 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
+#
+#      https://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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,15 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/8.1.1/userguide/multi_project_builds.html
+ */
+
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.4.0'
+}
+
+rootProject.name = 'jperf'

src/main/java/biz/nellemann/jperf/App.java

@@ -0,0 +1,55 @@
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package biz.nellemann.jperf;
+
+
+import picocli.CommandLine;
+import picocli.CommandLine.Command;
+import java.util.concurrent.Callable;
+
+@Command(name = "jperf", mixinStandardHelpOptions = true, version = "checksum 4.0",
+         description = "Java network performance tool.")
+public class App implements Callable<Integer> {
+
+
+    @Override
+    public Integer call() throws Exception { // your business logic goes here...
+
+        // Start server
+        UdpServer udpServer = new UdpServer();
+        udpServer.start();
+
+        int sequence = 0;
+
+        // Start client and send some messages
+        UdpClient udpClient = new UdpClient();
+
+        // Start datagram
+        Datagram datagram = new Datagram(DataType.HANDSHAKE.getValue(), 64, sequence++);
+        udpClient.send(datagram);
+
+        // Data datagrams ...
+        for(int i = 0; i < 10; i++) {
+            datagram = new Datagram(DataType.DATA.getValue(), 64, sequence++);
+            udpClient.send(datagram);
+        }
+
+        // End datagram
+        datagram = new Datagram(DataType.END.getValue(), 64, sequence++);
+        udpClient.send(datagram);
+
+        udpClient.close();
+
+
+        return 0;
+    }
+
+    // this example implements Callable, so parsing, error handling and handling user
+    // requests for usage help or version help can be done with one line of code.
+    public static void main(String... args) {
+        int exitCode = new CommandLine(new App()).execute(args);
+        System.exit(exitCode);
+    }
+
+}

src/main/java/biz/nellemann/jperf/DataType.java

@@ -0,0 +1,18 @@
+package biz.nellemann.jperf;
+
+public enum DataType {
+
+
+    HANDSHAKE(1), DATA(2), ACK(4), END(9);
+
+    private final int value;
+
+    private DataType(int value) {
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+}

src/main/java/biz/nellemann/jperf/Datagram.java

@@ -0,0 +1,110 @@
+package biz.nellemann.jperf;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * A datagram consists of
+ *
+ * <-------------------- HEADER 32 bytes -------------->  <---------- DATA -------->
+ *  int-4bytes   int-4bytes  long-8bytes  long-8bytes
+ *     TYPE         SIZE      SEQUENCE     TIMESTAMP
+ *
+ */
+
+public class Datagram {
+
+    final Logger log = LoggerFactory.getLogger(Datagram.class);
+
+    private final int HEADER_LENGTH = 24;
+
+    private final int type;
+    private final int size;
+    private final long sequence;
+    private final long timestamp;
+
+    private final byte[] data;
+
+
+    /**
+     * Create new empty datagram
+     * @param type
+     * @param size
+     * @param sequence
+     */
+    public Datagram(int type, int size, long sequence) {
+        this.type = type;
+        this.size = size;
+        this.sequence = sequence;
+        this.timestamp = System.currentTimeMillis();
+
+        this.data = new byte[size];
+    }
+
+
+
+    /**
+     * Assemble datagram from payload
+     * @param payload
+     */
+    public Datagram(byte[] payload) {
+
+        log.info("Datagram() 1");
+
+        ByteBuffer buffer = ByteBuffer.allocate(payload.length);
+
+        // Order is importent when assembling header fields like this
+        type = buffer.getInt();
+        size = buffer.getInt();
+        sequence = buffer.getLong();
+        timestamp = buffer.getLong();
+
+        log.info("Datagram() 2 ");
+
+
+        // Read everything after Header
+        data = new byte[size];
+
+        log.info("Datagram() 3 ");
+
+        buffer.get(data, HEADER_LENGTH, size);  // ERROR
+
+        log.info("Datagram() 4");
+    }
+
+
+    public int getLength() {
+        return HEADER_LENGTH + data.length;
+    }
+
+
+    public byte[] getPayload() throws IOException {
+        ByteBuffer buffer = ByteBuffer.allocate(HEADER_LENGTH + data.length + 1);
+
+        // Order is important
+        buffer.putInt(type);
+        buffer.putInt(size);
+        buffer.putLong(sequence);
+        buffer.putLong(timestamp);
+
+        buffer.put(data);
+
+        return buffer.array();
+    }
+
+
+    public int getType() {
+        return type;
+    }
+
+
+    public long getSequence() {
+        return sequence;
+    }
+
+
+}

src/main/java/biz/nellemann/jperf/UdpClient.java

@@ -0,0 +1,50 @@
+package biz.nellemann.jperf;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UdpClient {
+
+    final Logger log = LoggerFactory.getLogger(UdpClient.class);
+
+    private DatagramSocket socket;
+    private InetAddress address;
+
+    private byte[] buf;
+
+    public UdpClient() throws UnknownHostException, SocketException {
+        log.info("UdpClient");
+        socket = new DatagramSocket();
+        address = InetAddress.getByName("localhost");
+    }
+
+    public void send(Datagram datagram) throws IOException {
+        DatagramPacket packet = new DatagramPacket(datagram.getPayload(), datagram.getLength(), address, 4445);
+        socket.send(packet);
+    }
+
+
+    public String sendEcho(String msg) throws IOException {
+        log.info("send() - msg: {}", msg);
+
+        buf = msg.getBytes();
+        DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4445);
+        socket.send(packet);
+        packet = new DatagramPacket(buf, buf.length);
+        socket.receive(packet);
+        String received = new String( packet.getData(), 0, packet.getLength() );
+        return received;
+    }
+
+    public void close() {
+        socket.close();
+    }
+
+}

src/main/java/biz/nellemann/jperf/UdpServer.java

@@ -0,0 +1,81 @@
+package biz.nellemann.jperf;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UdpServer extends Thread {
+
+    final Logger log = LoggerFactory.getLogger(UdpServer.class);
+
+
+    private DatagramSocket socket;
+    private boolean running;
+    private byte[] buf = new byte[256];
+
+    public UdpServer() throws SocketException {
+        log.info("UdpServer()");
+        socket = new DatagramSocket(4445);
+    }
+
+    public void run() {
+        running = true;
+
+        try {
+            while (running) {
+
+                DatagramPacket packet = new DatagramPacket(buf, buf.length);
+                socket.receive(packet);
+
+                InetAddress address = packet.getAddress();
+                int port = packet.getPort();
+
+
+                Datagram datagram = new Datagram(buf);
+
+                if(datagram.getType() == DataType.HANDSHAKE.getValue()) {
+                    log.info("Handshake from ...");
+
+                }
+
+                if(datagram.getType() == DataType.END.getValue()) {
+                    running = false;
+                    log.info("Stopping ....");
+                }
+
+                if(datagram.getType() == DataType.DATA.getValue()) {
+                    log.info("Data .... size: {}", datagram.getLength());
+                }
+
+
+                // Send response ACK
+                Datagram responseDatagram = new Datagram(DataType.ACK.getValue(), 32, datagram.getSequence());
+                packet = new DatagramPacket(responseDatagram.getPayload(), responseDatagram.getLength(), address, port);
+                socket.send(packet);
+
+            }
+
+            socket.close();
+        } catch(IOException e) {
+
+        }
+
+    }
+
+
+    private void ack() {
+
+
+    }
+
+    private void receive(String msg) {
+        log.info("receive() - msg: {}", msg);
+    }
+
+
+}

src/test/groovy/biz/nellemann/jperf/AppTest.groovy

@@ -0,0 +1,11 @@
+/*
+ * This Spock specification was generated by the Gradle 'init' task.
+ */
+package biz.nellemann.jperf
+
+import spock.lang.Specification
+
+class AppTest extends Specification {
+
+
+}