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out | ||
gen | ||
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/build | ||
.gradle | ||
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# IDEs and editors | ||
/.idea | ||
*iml | ||
.project | ||
.classpath | ||
*.launch | ||
.settings/ | ||
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# System Files | ||
.DS_Store | ||
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# Envs | ||
.env |
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# Ktor kafka example | ||
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An example repo for the ktor kafka plugin: | ||
https://github.com/karlazzampersonal/ktor-kafka | ||
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In this example, I spin up 2 producers and a consumer for each one | ||
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- One producer that writes a string "Producer A value" to topic `topica`. It's invoked by hitting `localhost:8080/A` | ||
- Another producer that writes a random int from 1-10 to topic `topicb`. It's invoked by hitting `localhost:8080/B` | ||
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Example logs: | ||
``` | ||
2022-02-06 20:19:33.368 [DefaultDispatcher-worker-1] INFO kafka-consumer-logger-b-group - Consumer A reading message: Producer A value | ||
2022-02-06 20:19:33.526 [eventLoopGroupProxy-4-1] INFO ktor.application - 200 OK: GET - /A | ||
2022-02-06 20:19:43.927 [eventLoopGroupProxy-4-1] INFO ktor.application - 200 OK: GET - /B | ||
2022-02-06 20:19:43.937 [DefaultDispatcher-worker-2] INFO kafka-consumer-logger-b-group - Consumer B reading message: 7 | ||
2022-02-06 20:19:50.806 [eventLoopGroupProxy-4-1] INFO ktor.application - 200 OK: GET - /A | ||
2022-02-06 20:19:50.810 [DefaultDispatcher-worker-1] INFO kafka-consumer-logger-b-group - Consumer A reading message: Producer A value | ||
``` |
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import java.util.Properties | ||
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val ktor_version: String by project | ||
val kotlin_version: String by project | ||
val logback_version: String by project | ||
val ktor_kafka_version: String by project | ||
val kafka_version: String by project | ||
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plugins { | ||
application | ||
kotlin("jvm") version "1.6.10" | ||
id("org.jlleitschuh.gradle.ktlint") version "10.2.1" | ||
} | ||
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group = "com.levels" | ||
version = "0.0.1" | ||
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application { | ||
mainClass.set("com.levels.ApplicationKt") | ||
} | ||
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val props = Properties() | ||
props.load(file(".env").inputStream()) | ||
repositories { | ||
mavenCentral() | ||
// Need a GH access token with read package scope | ||
maven { | ||
name = "GitHubPackages" | ||
url = uri("https://maven.pkg.github.com/karlazzampersonal/ktor-kafka") | ||
credentials { | ||
username = props.getProperty("USERNAME") | ||
password = props.getProperty("TOKEN") | ||
} | ||
} | ||
} | ||
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ktlint { | ||
disabledRules.set(mutableListOf("no-wildcard-imports")) | ||
filter { | ||
exclude("**/generated/**") | ||
exclude { element -> element.file.path.contains("generated/") } | ||
include("**/kotlin/**") | ||
} | ||
} | ||
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dependencies { | ||
// 2 dependencies added for kafka: kafka-clients and ktor-kafka | ||
api("org.apache.kafka:kafka-clients:$kafka_version") | ||
implementation("com.levels:ktor-kafka:$ktor_kafka_version") | ||
implementation("io.ktor:ktor-server-core:$ktor_version") | ||
implementation("io.ktor:ktor-server-netty:$ktor_version") | ||
implementation("ch.qos.logback:logback-classic:$logback_version") | ||
testImplementation("io.ktor:ktor-server-tests:$ktor_version") | ||
testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version") | ||
} |
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kotlin.code.style=official | ||
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ktor_version=1.6.7 | ||
kotlin_version=1.6.10 | ||
logback_version=1.2.3 | ||
ktor_kafka_version=0.0.1 | ||
kafka_version=2.7.0 |
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distributionBase=GRADLE_USER_HOME | ||
distributionPath=wrapper/dists | ||
distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip | ||
zipStoreBase=GRADLE_USER_HOME | ||
zipStorePath=wrapper/dists |
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#!/usr/bin/env sh | ||
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# | ||
# Copyright 2015 the original author or 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. | ||
# | ||
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############################################################################## | ||
## | ||
## Gradle start up script for UN*X | ||
## | ||
############################################################################## | ||
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# Attempt to set APP_HOME | ||
# Resolve links: $0 may be a link | ||
PRG="$0" | ||
# Need this for relative symlinks. | ||
while [ -h "$PRG" ] ; do | ||
ls=`ls -ld "$PRG"` | ||
link=`expr "$ls" : '.*-> \(.*\)$'` | ||
if expr "$link" : '/.*' > /dev/null; then | ||
PRG="$link" | ||
else | ||
PRG=`dirname "$PRG"`"/$link" | ||
fi | ||
done | ||
SAVED="`pwd`" | ||
cd "`dirname \"$PRG\"`/" >/dev/null | ||
APP_HOME="`pwd -P`" | ||
cd "$SAVED" >/dev/null | ||
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APP_NAME="Gradle" | ||
APP_BASE_NAME=`basename "$0"` | ||
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. | ||
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' | ||
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# Use the maximum available, or set MAX_FD != -1 to use that value. | ||
MAX_FD="maximum" | ||
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warn () { | ||
echo "$*" | ||
} | ||
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die () { | ||
echo | ||
echo "$*" | ||
echo | ||
exit 1 | ||
} | ||
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# OS specific support (must be 'true' or 'false'). | ||
cygwin=false | ||
msys=false | ||
darwin=false | ||
nonstop=false | ||
case "`uname`" in | ||
CYGWIN* ) | ||
cygwin=true | ||
;; | ||
Darwin* ) | ||
darwin=true | ||
;; | ||
MSYS* | MINGW* ) | ||
msys=true | ||
;; | ||
NONSTOP* ) | ||
nonstop=true | ||
;; | ||
esac | ||
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar | ||
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# 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: $JAVA_HOME | ||
Please set the JAVA_HOME variable in your environment to match the | ||
location of your Java installation." | ||
fi | ||
else | ||
JAVACMD="java" | ||
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. | ||
Please set the JAVA_HOME variable in your environment to match the | ||
location of your Java installation." | ||
fi | ||
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# Increase the maximum file descriptors if we can. | ||
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then | ||
MAX_FD_LIMIT=`ulimit -H -n` | ||
if [ $? -eq 0 ] ; then | ||
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then | ||
MAX_FD="$MAX_FD_LIMIT" | ||
fi | ||
ulimit -n $MAX_FD | ||
if [ $? -ne 0 ] ; then | ||
warn "Could not set maximum file descriptor limit: $MAX_FD" | ||
fi | ||
else | ||
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" | ||
fi | ||
fi | ||
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# For Darwin, add options to specify how the application appears in the dock | ||
if $darwin; then | ||
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" | ||
fi | ||
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# For Cygwin or MSYS, switch paths to Windows format before running java | ||
if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then | ||
APP_HOME=`cygpath --path --mixed "$APP_HOME"` | ||
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` | ||
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JAVACMD=`cygpath --unix "$JAVACMD"` | ||
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# We build the pattern for arguments to be converted via cygpath | ||
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` | ||
SEP="" | ||
for dir in $ROOTDIRSRAW ; do | ||
ROOTDIRS="$ROOTDIRS$SEP$dir" | ||
SEP="|" | ||
done | ||
OURCYGPATTERN="(^($ROOTDIRS))" | ||
# Add a user-defined pattern to the cygpath arguments | ||
if [ "$GRADLE_CYGPATTERN" != "" ] ; then | ||
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" | ||
fi | ||
# Now convert the arguments - kludge to limit ourselves to /bin/sh | ||
i=0 | ||
for arg in "$@" ; do | ||
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` | ||
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option | ||
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if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition | ||
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` | ||
else | ||
eval `echo args$i`="\"$arg\"" | ||
fi | ||
i=`expr $i + 1` | ||
done | ||
case $i in | ||
0) set -- ;; | ||
1) set -- "$args0" ;; | ||
2) set -- "$args0" "$args1" ;; | ||
3) set -- "$args0" "$args1" "$args2" ;; | ||
4) set -- "$args0" "$args1" "$args2" "$args3" ;; | ||
5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; | ||
6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; | ||
7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; | ||
8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; | ||
9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; | ||
esac | ||
fi | ||
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# Escape application args | ||
save () { | ||
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done | ||
echo " " | ||
} | ||
APP_ARGS=`save "$@"` | ||
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# Collect all arguments for the java command, following the shell quoting and substitution rules | ||
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" | ||
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exec "$JAVACMD" "$@" |
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@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 | ||
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@if "%DEBUG%" == "" @echo off | ||
@rem ########################################################################## | ||
@rem | ||
@rem Gradle startup script for Windows | ||
@rem | ||
@rem ########################################################################## | ||
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@rem Set local scope for the variables with windows NT shell | ||
if "%OS%"=="Windows_NT" setlocal | ||
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set DIRNAME=%~dp0 | ||
if "%DIRNAME%" == "" set DIRNAME=. | ||
set APP_BASE_NAME=%~n0 | ||
set APP_HOME=%DIRNAME% | ||
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@rem Resolve any "." and ".." in APP_HOME to make it shorter. | ||
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi | ||
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@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" | ||
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@rem Find java.exe | ||
if defined JAVA_HOME goto findJavaFromJavaHome | ||
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set JAVA_EXE=java.exe | ||
%JAVA_EXE% -version >NUL 2>&1 | ||
if "%ERRORLEVEL%" == "0" goto execute | ||
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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. | ||
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goto fail | ||
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:findJavaFromJavaHome | ||
set JAVA_HOME=%JAVA_HOME:"=% | ||
set JAVA_EXE=%JAVA_HOME%/bin/java.exe | ||
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if exist "%JAVA_EXE%" goto execute | ||
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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. | ||
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goto fail | ||
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:execute | ||
@rem Setup the command line | ||
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set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar | ||
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@rem Execute Gradle | ||
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* | ||
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:end | ||
@rem End local scope for the variables with windows NT shell | ||
if "%ERRORLEVEL%"=="0" goto mainEnd | ||
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:fail | ||
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of | ||
rem the _cmd.exe /c_ return code! | ||
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 | ||
exit /b 1 | ||
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:mainEnd | ||
if "%OS%"=="Windows_NT" endlocal | ||
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:omega |
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rootProject.name = "ktor-kafka-example" |
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