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Posted to commits@cassandra.apache.org by ja...@apache.org on 2019/02/19 02:26:10 UTC
[cassandra-sidecar] branch master created (now a15ed26)
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in repository https://gitbox.apache.org/repos/asf/cassandra-sidecar.git.
at a15ed26 C* Management process
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new a15ed26 C* Management process
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[cassandra-sidecar] 01/01: C* Management process
Posted by ja...@apache.org.
This is an automated email from the ASF dual-hosted git repository.
jasobrown pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/cassandra-sidecar.git
commit a15ed267d1977e38ba36d061139839fad7b865f2
Author: Dinesh Joshi <di...@apple.com>
AuthorDate: Mon Feb 18 18:16:35 2019 -0800
C* Management process
patch by Dinesh Joshi; reviewed by jasobrown and Chris Lohfink for CASSANDRA-14395
Co-authored-by: Vinay Chella <vi...@gmail.com>
Co-authored-by: Joey Lynch <jo...@gmail.com>
---
.gitignore | 79 ++++++
CHANGES.txt | 3 +
LICENSE.txt | 209 ++++++++++++++++
README.md | 29 +++
build.gradle | 117 +++++++++
conf/logback.xml | 76 ++++++
conf/sidecar.yaml | 13 +
gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 55190 bytes
gradle/wrapper/gradle-wrapper.properties | 5 +
gradlew | 172 +++++++++++++
gradlew.bat | 84 +++++++
ide/idea/codeStyleSettings.xml | 275 +++++++++++++++++++++
.../cassandra/sidecar/CassandraSidecarDaemon.java | 81 ++++++
.../apache/cassandra/sidecar/Configuration.java | 94 +++++++
.../org/apache/cassandra/sidecar/MainModule.java | 102 ++++++++
.../cassandra/sidecar/routes/HealthCheck.java | 122 +++++++++
.../cassandra/sidecar/routes/HealthService.java | 90 +++++++
.../cassandra/sidecar/HealthServiceTest.java | 105 ++++++++
.../org/apache/cassandra/sidecar/TestModule.java | 99 ++++++++
.../cassandra/sidecar/mocks/MockHealthCheck.java | 37 +++
20 files changed, 1792 insertions(+)
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d08471c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,79 @@
+.gitignore
+
+# C*
+build/
+src/gen-java/
+src/resources/org/apache/cassandra/config/
+logs/
+data/
+conf/hotspot_compiler
+doc/cql3/CQL.html
+
+# C* debs
+build-stamp
+build.properties
+debian/cassandra*debhelper*
+debian/cassandra*.substvars
+debian/cassandra/
+debian/cassandra-tools/
+debian/files
+
+# gitignore doesn't help with modified files - you may wish to:
+# git update-index --assume-unchanged test/data/serialization/2.0/db.RowMutation.bin
+# to undo:
+# git update-index --no-assume-unchanged test/data/serialization/2.0/db.RowMutation.bin
+
+# IntelliJ
+.idea/
+*.eml
+*.iml
+*.ipr
+*.iws
+
+# Eclipse
+.classpath
+.project
+.metadata
+.settings/
+local.properties
+
+# Cscope
+cscope.*
+
+# NetBeans
+nbbuild/
+nbdist/
+nbproject/
+nb-configuration.xml
+nbactions.xml
+
+# Maven, etc.
+out/
+target/
+
+# General
+*.pyc
+*~
+*.bak
+*.sw[o,p]
+*.tmp
+.DS_Store
+Thumbs.db
+
+# JSR223
+lib/jsr223/clojure/*.jar
+lib/jsr223/groovy/*.jar
+lib/jsr223/jaskell/*.jar
+lib/jsr223/jruby/*.jar
+lib/jsr223/jruby/jni
+lib/jsr223/jruby/ruby
+lib/jsr223/jython/*.jar
+lib/jsr223/jython/cachedir
+lib/jsr223/scala/*.jar
+
+/.ant-targets-build.xml
+
+# Generated files from the documentation
+doc/source/configuration/cassandra_config_file.rst
+doc/source/tools/nodetool
+
diff --git a/CHANGES.txt b/CHANGES.txt
new file mode 100644
index 0000000..0253303
--- /dev/null
+++ b/CHANGES.txt
@@ -0,0 +1,3 @@
+1.0.0
+-----
+ * C* Management process (CASSANDRA-14395)
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..d5c4984
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,209 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
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+
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
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+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
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+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
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+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
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+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+ END OF TERMS AND CONDITIONS
+
+ APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
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+ file or class name and description of purpose be included on the
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+ Copyright [yyyy] [name of copyright owner]
+
+ 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
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+
+THIRD-PARTY DEPENDENCIES
+========================
+Convenience copies of some third-party dependencies are distributed with
+Apache Cassandra as Java jar files in lib/. Licensing information for
+these files can be found in the lib/licenses directory.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..da3ce7c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+# Apache Cassandra Sidecar [WIP]
+
+This is a Sidecar for the highly scalable Apache Cassandra database.
+For more information, see [the Apache Cassandra web site](http://cassandra.apache.org/) and [CIP-1](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=95652224).
+
+**This is project is still WIP.**
+
+Requirements
+------------
+ 1. Java >= 1.8 (OpenJDK or Oracle)
+ 2. Apache Cassandra 4.0
+
+Getting started
+---------------
+
+After you clone the git repo, you can use the gradle wrapper to build and run the project. Make sure you have
+Apache Cassandra running on the host & port specified in `conf/sidecar.yaml`.
+
+ $ ./gradlew run
+
+You can use `build`, `test` to build & test the project.
+
+Wondering where to go from here?
+--------------------------------
+ * Join us in #cassandra on irc.freenode.net and ask questions
+ * Subscribe to the Users mailing list by sending a mail to
+ user-subscribe@cassandra.apache.org
+ * Visit the [community section](http://cassandra.apache.org/community/) of the Cassandra website for more information on getting involved.
+ * Visit the [development section](http://cassandra.apache.org/doc/latest/development/index.html) of the Cassandra website for more information on how to contribute.
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..b7659a8
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,117 @@
+group 'org.apache.cassandra'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+apply plugin: 'application'
+apply plugin: 'idea'
+
+sourceCompatibility = 1.8
+
+repositories {
+ mavenCentral()
+}
+
+// Take the application out once we're running via Cassandra
+mainClassName = "org.apache.cassandra.sidecar.CassandraSidecarDaemon"
+applicationName = 'CassandraSidecarDaemon'
+
+// Config file location should be in file:/// format for local files,
+// when we have the fix for adding /conf directory to classpaht, we can get away with below default JvmArg
+def confFile = "file:" + File.separator + File.separator + "APP_HOME_TO_REPLACE/conf/sidecar.yaml"
+
+applicationDefaultJvmArgs = ["-Dsidecar.logdir=./logs",
+ "-Dsidecar.config=" + confFile,
+ "-Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory",
+ "-javaagent:APP_HOME_TO_REPLACE/agents/jolokia-jvm-1.6.0-agent.jar=port=7777,host=localhost"]
+startScripts {
+ doLast {
+ unixScript.text = unixScript.text.replace("APP_HOME_TO_REPLACE", "\${APP_HOME}")
+ }
+}
+
+run {
+ confFile = "file:" + File.separator + File.separator + "$projectDir/conf/sidecar.yaml"
+ jvmArgs = ["-Dsidecar.logdir=./logs",
+ "-Dsidecar.config=" + confFile,
+ "-Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory",
+ "-javaagent:$projectDir/src/dist/agents/jolokia-jvm-1.6.0-agent.jar=port=7777,host=localhost"]
+}
+
+sourceSets {
+ // This is needed as gradle considers `src/main/resources` as the default resources folder
+ main {
+ resources {
+ srcDirs = ['conf', 'setup']
+ }
+ }
+ test {
+ resources {
+ srcDirs = [main.resources]
+ }
+ }
+}
+
+configurations {
+ jolokia
+}
+
+dependencies {
+ compile 'io.vertx:vertx-web:3.6.3'
+ compile 'io.vertx:vertx-dropwizard-metrics:3.6.3'
+ compile 'io.vertx:vertx-web-client:3.6.3'
+
+ // Trying to be exactly compatible with Cassandra's deps
+ compile 'org.slf4j:slf4j-api:1.7.25'
+ compile 'ch.qos.logback:logback-core:1.2.3'
+ compile 'ch.qos.logback:logback-classic:1.2.3'
+ compile 'com.datastax.cassandra:cassandra-driver-core:3.6+'
+ compile group: 'com.google.inject', name: 'guice', version: '4.2.2'
+ compile group: 'org.apache.commons', name: 'commons-configuration2', version: '2.4'
+
+ runtime group: 'commons-beanutils', name: 'commons-beanutils', version: '1.9.3'
+ runtime group: 'org.yaml', name: 'snakeyaml', version: '1.23'
+ jolokia 'org.jolokia:jolokia-jvm:1.6.0:agent'
+
+ testCompile group: 'org.cassandraunit', name: 'cassandra-unit-shaded', version: '3.3.0.2'
+ testCompile 'com.datastax.cassandra:cassandra-driver-core:3.6+:tests'
+ testCompile 'org.apache.commons:commons-exec:1.3+'
+ testCompile group: 'org.mockito', name: 'mockito-all', version: '1.10.19'
+ testCompile group: 'io.vertx', name: 'vertx-junit5', version: '3.6.3'
+}
+
+task copyCodeStyle(type: Copy) {
+ from "ide/idea/codeStyleSettings.xml"
+ into ".idea"
+}
+
+// Lets copy the distributions from build/install directory to /bin and /lib
+// directories to be aligned with C* distribution format
+task copyDist(type: Copy) {
+ from "$buildDir/install/$applicationName"
+ into "$projectDir"
+}
+
+task copyJolokia(type: Copy) {
+ from configurations.jolokia
+ into "$projectDir/src/dist/agents"
+}
+
+// Lets clean /bin and /lib directories along with default build directories.
+clean {
+ println "Deleting directory $projectDir/bin"
+ delete "$projectDir/bin"
+ println "Deleting directory $projectDir/lib"
+ delete "$projectDir/lib"
+ println "Deleting agents $projectDir/src/dist/agents"
+ delete "$projectDir/src/dist/agents"
+
+}
+
+test {
+ useJUnitPlatform()
+}
+
+// copyDist gets called on every build
+copyDist.dependsOn installDist
+build.dependsOn copyDist
+build.dependsOn copyJolokia
diff --git a/conf/logback.xml b/conf/logback.xml
new file mode 100644
index 0000000..bd0e398
--- /dev/null
+++ b/conf/logback.xml
@@ -0,0 +1,76 @@
+<!--
+ ~ Licensed to the Apache Software Foundation (ASF) under one
+ ~ or more contributor license agreements. See the NOTICE file
+ ~ distributed with this work for additional information
+ ~ regarding copyright ownership. The ASF licenses this file
+ ~ to you 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.
+ -->
+
+<configuration scan="true" scanPeriod="60 seconds">
+ <jmxConfigurator />
+
+ <appender name="SIDECAR" class="ch.qos.logback.core.rolling.RollingFileAppender">
+ <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+ <level>INFO</level>
+ </filter>
+ <file>${sidecar.logdir}/system.log</file>
+ <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
+ <!-- rollover daily -->
+ <fileNamePattern>${sidecar.logdir}/system.log.%d{yyyy-MM-dd}.%i.zip</fileNamePattern>
+ <!-- each file should be at most 10MB, keep 3 days worth of history, but at most 5GB -->
+ <maxFileSize>10MB</maxFileSize>
+ <maxHistory>3</maxHistory>
+ <totalSizeCap>2GB</totalSizeCap>
+ </rollingPolicy>
+ <encoder>
+ <pattern>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n</pattern>
+ </encoder>
+ </appender>
+
+ <!-- DEBUGLOG rolling file appender to debug.log (all levels) -->
+
+ <appender name="SIDECAR_DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
+ <file>${sidecar.logdir}/debug.log</file>
+ <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+ <level>INFO</level>
+ </filter>
+ <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
+ <!-- rollover daily -->
+ <fileNamePattern>${sidecar.logdir}/debug.log.%d{yyyy-MM-dd}.%i.zip</fileNamePattern>
+ <!-- each file should be at most 20MB, keep 3 days worth of history, but at most 5GB -->
+ <maxFileSize>20MB</maxFileSize>
+ <maxHistory>3</maxHistory>
+ <totalSizeCap>5GB</totalSizeCap>
+ </rollingPolicy>
+ <encoder>
+ <pattern>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n</pattern>
+ </encoder>
+ </appender>
+
+ <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+ <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+ <level>DEBUG</level>
+ </filter>
+ <encoder>
+ <pattern>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n</pattern>
+ </encoder>
+ </appender>
+
+ <root level="INFO">
+ <appender-ref ref="SIDECAR" />
+ <appender-ref ref="SIDECAR_DEBUG" />
+ <appender-ref ref="STDOUT" />
+ </root>
+
+ <logger name="org.apache.cassandra" level="DEBUG"/>
+</configuration>
diff --git a/conf/sidecar.yaml b/conf/sidecar.yaml
new file mode 100644
index 0000000..8ffbcc6
--- /dev/null
+++ b/conf/sidecar.yaml
@@ -0,0 +1,13 @@
+#
+# Cassandra SideCar configuration file
+#
+
+cassandra:
+ - host: localhost
+ - port: 9042
+
+sidecar:
+ - port: 9043
+
+healthcheck:
+ - poll_freq_millis: 30000
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..87b738c
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..44e7c4d
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..af6708f
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# 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
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$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" = "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
+
+# 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
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # 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
+
+ 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`="\"$arg\""
+ fi
+ i=$((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
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# 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"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..0f8d593
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@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=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@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"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+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 init
+
+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
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+: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 %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="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!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/ide/idea/codeStyleSettings.xml b/ide/idea/codeStyleSettings.xml
new file mode 100644
index 0000000..d9190a7
--- /dev/null
+++ b/ide/idea/codeStyleSettings.xml
@@ -0,0 +1,275 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="ProjectCodeStyleSettingsManager">
+ <option name="PER_PROJECT_SETTINGS">
+ <value>
+ <option name="INSERT_OVERRIDE_ANNOTATION" value="false" />
+ <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
+ <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="100" />
+ <option name="IMPORT_LAYOUT_TABLE">
+ <value>
+ <package name="java" withSubpackages="true" static="false" />
+ <package name="javax" withSubpackages="true" static="false" />
+ <emptyLine />
+ <package name="com.google.common" withSubpackages="true" static="false" />
+ <package name="org.apache.log4j" withSubpackages="true" static="false" />
+ <package name="org.apache.commons" withSubpackages="true" static="false" />
+ <package name="org.cliffc.high_scale_lib" withSubpackages="true" static="false" />
+ <package name="org.junit" withSubpackages="true" static="false" />
+ <package name="org.slf4j" withSubpackages="true" static="false" />
+ <emptyLine />
+ <package name="" withSubpackages="true" static="false" />
+ <emptyLine />
+ <package name="" withSubpackages="true" static="true" />
+ </value>
+ </option>
+ <option name="BRACE_STYLE" value="2" />
+ <option name="CLASS_BRACE_STYLE" value="2" />
+ <option name="METHOD_BRACE_STYLE" value="2" />
+ <option name="ELSE_ON_NEW_LINE" value="true" />
+ <option name="CATCH_ON_NEW_LINE" value="true" />
+ <option name="FINALLY_ON_NEW_LINE" value="true" />
+ <option name="ALIGN_MULTILINE_PARAMETERS_IN_CALLS" value="true" />
+ <option name="ALIGN_MULTILINE_BINARY_OPERATION" value="true" />
+ <option name="ALIGN_MULTILINE_ASSIGNMENT" value="true" />
+ <option name="ALIGN_MULTILINE_TERNARY_OPERATION" value="true" />
+ <option name="ALIGN_MULTILINE_THROWS_LIST" value="true" />
+ <option name="ALIGN_MULTILINE_EXTENDS_LIST" value="true" />
+ <option name="ALIGN_MULTILINE_PARENTHESIZED_EXPRESSION" value="true" />
+ <option name="ALIGN_MULTILINE_ARRAY_INITIALIZER_EXPRESSION" value="true" />
+ <option name="SPACE_WITHIN_ARRAY_INITIALIZER_BRACES" value="true" />
+ <option name="DOWHILE_BRACE_FORCE" value="3" />
+ <XML>
+ <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+ </XML>
+ <codeStyleSettings language="JAVA">
+ <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="0" />
+ <option name="BRACE_STYLE" value="2" />
+ <option name="CLASS_BRACE_STYLE" value="2" />
+ <option name="METHOD_BRACE_STYLE" value="2" />
+ <option name="ELSE_ON_NEW_LINE" value="true" />
+ <option name="CATCH_ON_NEW_LINE" value="true" />
+ <option name="FINALLY_ON_NEW_LINE" value="true" />
+ <option name="ALIGN_MULTILINE_CHAINED_METHODS" value="true" />
+ <option name="ALIGN_MULTILINE_PARAMETERS_IN_CALLS" value="true" />
+ <option name="ALIGN_MULTILINE_BINARY_OPERATION" value="true" />
+ <option name="ALIGN_MULTILINE_ASSIGNMENT" value="true" />
+ <option name="ALIGN_MULTILINE_TERNARY_OPERATION" value="true" />
+ <option name="ALIGN_MULTILINE_THROWS_LIST" value="true" />
+ <option name="ALIGN_THROWS_KEYWORD" value="true" />
+ <option name="ALIGN_MULTILINE_EXTENDS_LIST" value="true" />
+ <option name="ALIGN_MULTILINE_PARENTHESIZED_EXPRESSION" value="true" />
+ <option name="ALIGN_MULTILINE_ARRAY_INITIALIZER_EXPRESSION" value="true" />
+ <option name="SPACE_WITHIN_ARRAY_INITIALIZER_BRACES" value="true" />
+ <option name="DOWHILE_BRACE_FORCE" value="3" />
+ <option name="PARENT_SETTINGS_INSTALLED" value="true" />
+ <indentOptions>
+ <option name="CONTINUATION_INDENT_SIZE" value="0" />
+ <option name="USE_RELATIVE_INDENTS" value="true" />
+ </indentOptions>
+ <arrangement>
+ <groups>
+ <group>
+ <type>GETTERS_AND_SETTERS</type>
+ <order>KEEP</order>
+ </group>
+ </groups>
+ <rules>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PUBLIC />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PROTECTED />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PACKAGE_PRIVATE />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PRIVATE />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PUBLIC />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PROTECTED />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PACKAGE_PRIVATE />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PRIVATE />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PUBLIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PROTECTED />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PACKAGE_PRIVATE />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <FINAL />
+ <PRIVATE />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PUBLIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PROTECTED />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PACKAGE_PRIVATE />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <FIELD />
+ <PRIVATE />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <FIELD />
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <CONSTRUCTOR />
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <METHOD />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <METHOD />
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <ENUM />
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <INTERFACE />
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <AND>
+ <CLASS />
+ <STATIC />
+ </AND>
+ </match>
+ </rule>
+ <rule>
+ <match>
+ <CLASS />
+ </match>
+ </rule>
+ </rules>
+ </arrangement>
+ </codeStyleSettings>
+ </value>
+ </option>
+ <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/src/main/java/org/apache/cassandra/sidecar/CassandraSidecarDaemon.java b/src/main/java/org/apache/cassandra/sidecar/CassandraSidecarDaemon.java
new file mode 100644
index 0000000..6ab682b
--- /dev/null
+++ b/src/main/java/org/apache/cassandra/sidecar/CassandraSidecarDaemon.java
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar;
+
+import com.google.inject.Guice;
+import com.google.inject.Inject;
+import io.vertx.core.http.HttpServer;
+import org.apache.cassandra.sidecar.routes.HealthService;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+public class CassandraSidecarDaemon
+{
+ private static final Logger logger = LoggerFactory.getLogger(CassandraSidecarDaemon.class);
+ private final HealthService healthService;
+ private final HttpServer server;
+ private final Configuration config;
+
+ @Inject
+ public CassandraSidecarDaemon(HealthService healthService, HttpServer server, Configuration config)
+ {
+ this.healthService = healthService;
+ this.server = server;
+ this.config = config;
+ }
+
+ public void start()
+ {
+ banner();
+ logger.info("Starting Cassandra Sidecar on port {}", config.getPort());
+ healthService.start();
+ server.listen();
+ }
+
+ public void stop()
+ {
+ logger.info("Stopping Cassandra Sidecar");
+ healthService.stop();
+ server.close();
+ }
+
+ private void banner()
+ {
+ System.out.println(" _____ _ _____ _ _ \n" +
+ "/ __ \\ | | / ___(_) | | \n" +
+ "| / \\/ __ _ ___ ___ __ _ _ __ __| |_ __ __ _ \\ `--. _ __| | ___ ___ __ _ _ __ \n" +
+ "| | / _` / __/ __|/ _` | '_ \\ / _` | '__/ _` | `--. \\ |/ _` |/ _ \\/ __/ _` | '__|\n" +
+ "| \\__/\\ (_| \\__ \\__ \\ (_| | | | | (_| | | | (_| | /\\__/ / | (_| | __/ (_| (_| | | \n" +
+ " \\____/\\__,_|___/___/\\__,_|_| |_|\\__,_|_| \\__,_| \\____/|_|\\__,_|\\___|\\___\\__,_|_| \n" +
+ " \n" +
+ " ");
+ }
+
+ public static void main(String[] args)
+ {
+ CassandraSidecarDaemon app = Guice.createInjector(new MainModule())
+ .getInstance(CassandraSidecarDaemon.class);
+
+ app.start();
+ Runtime.getRuntime().addShutdownHook(new Thread(app::stop));
+ }
+}
+
diff --git a/src/main/java/org/apache/cassandra/sidecar/Configuration.java b/src/main/java/org/apache/cassandra/sidecar/Configuration.java
new file mode 100644
index 0000000..8086164
--- /dev/null
+++ b/src/main/java/org/apache/cassandra/sidecar/Configuration.java
@@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar;
+
+/**
+ * Sidecar configuration
+ */
+public class Configuration
+{
+ /* Cassandra Host */
+ private final String cassandraHost;
+
+ /* Cassandra Port */
+ private final Integer cassandraPort;
+
+ /* Sidecar's HTTP REST API port */
+ private final Integer port;
+
+ /* Healthcheck frequency in miilis */
+ private final Integer healthCheckFrequencyMillis;
+
+ /**
+ * Constructor
+ *
+ * @param cassandraHost
+ * @param cassandraPort
+ * @param port
+ * @param healthCheckFrequencyMillis
+ */
+ public Configuration(String cassandraHost, Integer cassandraPort, Integer port,
+ Integer healthCheckFrequencyMillis)
+ {
+ this.cassandraHost = cassandraHost;
+ this.cassandraPort = cassandraPort;
+ this.port = port;
+ this.healthCheckFrequencyMillis = healthCheckFrequencyMillis;
+ }
+
+ /**
+ * Get the Cassandra host
+ *
+ * @return
+ */
+ public String getCassandraHost()
+ {
+ return cassandraHost;
+ }
+
+ /**
+ * Get the Cassandra port
+ *
+ * @return
+ */
+ public Integer getCassandraPort()
+ {
+ return cassandraPort;
+ }
+
+ /**
+ * Get the Sidecar's REST HTTP API port
+ *
+ * @return
+ */
+ public Integer getPort()
+ {
+ return port;
+ }
+
+ /**
+ * Get the health check frequency in millis
+ *
+ * @return
+ */
+ public Integer getHealthCheckFrequencyMillis()
+ {
+ return healthCheckFrequencyMillis;
+ }
+}
diff --git a/src/main/java/org/apache/cassandra/sidecar/MainModule.java b/src/main/java/org/apache/cassandra/sidecar/MainModule.java
new file mode 100644
index 0000000..a6950a7
--- /dev/null
+++ b/src/main/java/org/apache/cassandra/sidecar/MainModule.java
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+import com.google.inject.Singleton;
+import io.vertx.core.Vertx;
+import io.vertx.core.VertxOptions;
+import io.vertx.core.http.HttpServer;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.ext.dropwizard.DropwizardMetricsOptions;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.handler.LoggerHandler;
+import org.apache.cassandra.sidecar.routes.HealthCheck;
+import org.apache.cassandra.sidecar.routes.HealthService;
+import org.apache.commons.configuration2.YAMLConfiguration;
+import org.apache.commons.configuration2.builder.fluent.Configurations;
+import org.apache.commons.configuration2.ex.ConfigurationException;
+
+import java.io.File;
+
+public class MainModule extends AbstractModule
+{
+ @Override
+ protected void configure()
+ {
+ bind(CassandraSidecarDaemon.class).in(Singleton.class);
+ }
+
+ @Provides
+ @Singleton
+ public Vertx getVertx()
+ {
+ return Vertx.vertx(new VertxOptions().setMetricsOptions(
+ new DropwizardMetricsOptions()
+ .setEnabled(true)
+ .setJmxEnabled(true)
+ .setJmxDomain("cassandra-sidecar-metrics")
+ ));
+ }
+
+ @Provides
+ @Singleton
+ public HealthService healthService(Configuration config)
+ {
+ return new HealthService(config.getHealthCheckFrequencyMillis(),
+ new HealthCheck(config.getCassandraHost(), config.getCassandraPort()));
+ }
+
+ @Provides
+ @Singleton
+ public HttpServer vertxServer(Vertx vertx, Configuration config, Router router)
+ {
+ HttpServer server = vertx.createHttpServer(new HttpServerOptions()
+ .setPort(config.getPort())
+ .setLogActivity(true));
+ server.requestHandler(router);
+ return server;
+ }
+
+ @Provides
+ @Singleton
+ public Router vertxRouter(Vertx vertx, HealthService healthService)
+ {
+ Router router = Router.router(vertx);
+ router.route().handler(LoggerHandler.create());
+ router.route().path("/api/v1/__health").handler(healthService::handleHealth);
+ return router;
+ }
+
+ @Provides
+ @Singleton
+ public Configuration configuration() throws ConfigurationException
+ {
+ Configurations confs = new Configurations();
+ File propFile = new File("sidecar.yaml");
+ YAMLConfiguration yamlConf = confs.fileBased(YAMLConfiguration.class, propFile);
+
+ return new Configuration(
+ yamlConf.get(String.class, "cassandra.host"),
+ yamlConf.get(Integer.class, "cassandra.port"),
+ yamlConf.get(Integer.class, "sidecar.port"),
+ yamlConf.get(Integer.class, "healthcheck.poll_freq_millis"));
+ }
+}
diff --git a/src/main/java/org/apache/cassandra/sidecar/routes/HealthCheck.java b/src/main/java/org/apache/cassandra/sidecar/routes/HealthCheck.java
new file mode 100644
index 0000000..d2ac58e
--- /dev/null
+++ b/src/main/java/org/apache/cassandra/sidecar/routes/HealthCheck.java
@@ -0,0 +1,122 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar.routes;
+
+import com.datastax.driver.core.Cluster;
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Session;
+import com.datastax.driver.core.policies.RoundRobinPolicy;
+import com.datastax.driver.core.policies.WhiteListPolicy;
+import io.vertx.core.logging.Logger;
+import io.vertx.core.logging.LoggerFactory;
+
+import java.net.InetSocketAddress;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Supplier;
+
+public class HealthCheck implements Supplier<Boolean>
+{
+ private static final Logger logger = LoggerFactory.getLogger(HealthCheck.class);
+ private final String cassandraHost;
+ private final int cassandraPort;
+ private Cluster cluster;
+ private Session session;
+
+ /**
+ * Constructor
+ *
+ * @param cassandraHost
+ * @param cassandraPort
+ */
+ public HealthCheck(String cassandraHost, int cassandraPort)
+ {
+ this.cassandraHost = cassandraHost;
+ this.cassandraPort = cassandraPort;
+ this.cluster = createCluster(cassandraHost, cassandraPort);
+ }
+
+ /**
+ * The actual health check
+ *
+ * @return
+ */
+ private boolean check()
+ {
+
+ try
+ {
+ if (cluster == null)
+ cluster = createCluster(cassandraHost, cassandraPort);
+
+ if (cluster == null)
+ return false;
+
+ if (session == null)
+ session = cluster.connect();
+
+ ResultSet rs = session.execute("SELECT release_version FROM system.local");
+ return (rs.one() != null);
+ }
+ catch (Exception e)
+ {
+ logger.debug("Failed to reach Cassandra.", e);
+ session = null;
+ cluster = null;
+ return false;
+ }
+ }
+
+ /**
+ * Get the check value
+ *
+ * @return true or false based on whether check was successful
+ */
+ @Override
+ public Boolean get()
+ {
+ return check();
+ }
+
+ /**
+ * Creates a cluster object which ensures that the requests go only to the specified C* node
+ *
+ * @param cassandraHost
+ * @param cassandraPort
+ * @return
+ */
+ final private synchronized Cluster createCluster(String cassandraHost, int cassandraPort)
+ {
+ try
+ {
+ List<InetSocketAddress> wl = Collections.singletonList(InetSocketAddress.createUnresolved(cassandraHost, cassandraPort));
+ cluster = Cluster.builder()
+ .addContactPointsWithPorts(InetSocketAddress.createUnresolved(cassandraHost, cassandraPort))
+ .withoutMetrics()
+ .withLoadBalancingPolicy(new WhiteListPolicy(new RoundRobinPolicy(), wl))
+ .build();
+ }
+ catch (Exception e)
+ {
+ logger.error("Failed to create Cluster object", e);
+ }
+
+ return cluster;
+ }
+}
diff --git a/src/main/java/org/apache/cassandra/sidecar/routes/HealthService.java b/src/main/java/org/apache/cassandra/sidecar/routes/HealthService.java
new file mode 100644
index 0000000..53903b2
--- /dev/null
+++ b/src/main/java/org/apache/cassandra/sidecar/routes/HealthService.java
@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar.routes;
+
+import com.google.common.collect.ImmutableMap;
+
+import io.netty.handler.codec.http.HttpHeaderValues;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.vertx.core.http.HttpHeaders;
+import io.vertx.core.json.Json;
+import io.vertx.core.logging.Logger;
+import io.vertx.core.logging.LoggerFactory;
+import io.vertx.ext.web.RoutingContext;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Supplier;
+
+public class HealthService
+{
+ private static final Logger logger = LoggerFactory.getLogger(HealthService.class);
+ private final int CHECK_PERIOD_MS;
+ private final Supplier<Boolean> check;
+
+ private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
+ private volatile boolean lastKnownStatus = false;
+
+ public HealthService(int checkPeriodMillis, Supplier<Boolean> check)
+ {
+ this.CHECK_PERIOD_MS = checkPeriodMillis;
+ this.check = check;
+ }
+
+ synchronized public void start()
+ {
+ logger.info("Starting health check");
+ executor.scheduleWithFixedDelay(this::refreshNow, 0, CHECK_PERIOD_MS, TimeUnit.MILLISECONDS);
+ }
+
+ synchronized public void refreshNow()
+ {
+ try
+ {
+ lastKnownStatus = this.check.get();
+ }
+ catch (Exception e)
+ {
+ logger.error("Error while performing health check", e);
+ }
+ }
+
+ synchronized public void stop()
+ {
+ logger.info("Stopping health check");
+ executor.shutdown();
+ }
+
+ public void handleHealth(RoutingContext rc)
+ {
+ try
+ {
+ rc.response()
+ .putHeader(HttpHeaders.CONTENT_TYPE, HttpHeaderValues.APPLICATION_JSON)
+ .setStatusCode(lastKnownStatus ? HttpResponseStatus.OK.code() : HttpResponseStatus.SERVICE_UNAVAILABLE.code())
+ .end(Json.encode(ImmutableMap.of("status", lastKnownStatus ? "OK" : "NOT_OK")));
+ }
+ catch (Exception e)
+ {
+ logger.error("Caught exception", e);
+ rc.response().setStatusCode(400).end();
+ }
+ }
+}
diff --git a/src/test/java/org/apache/cassandra/sidecar/HealthServiceTest.java b/src/test/java/org/apache/cassandra/sidecar/HealthServiceTest.java
new file mode 100644
index 0000000..9a39c44
--- /dev/null
+++ b/src/test/java/org/apache/cassandra/sidecar/HealthServiceTest.java
@@ -0,0 +1,105 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.HttpServer;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.client.WebClient;
+import io.vertx.ext.web.codec.BodyCodec;
+import io.vertx.junit5.VertxExtension;
+import io.vertx.junit5.VertxTestContext;
+import org.apache.cassandra.sidecar.mocks.MockHealthCheck;
+import org.apache.cassandra.sidecar.routes.HealthService;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+@DisplayName("Health Service Test")
+@ExtendWith(VertxExtension.class)
+public class HealthServiceTest
+{
+ private MockHealthCheck check;
+ private HealthService service;
+ private Vertx vertx;
+ private Configuration config;
+
+ @BeforeEach
+ void setUp()
+ {
+ Injector injector = Guice.createInjector(new TestModule(Vertx.vertx()));
+ HttpServer server = injector.getInstance(HttpServer.class);
+ Router router = injector.getInstance(Router.class);
+
+ check = injector.getInstance(MockHealthCheck.class);
+ service = injector.getInstance(HealthService.class);
+ vertx = injector.getInstance(Vertx.class);
+ config = injector.getInstance(Configuration.class);
+
+ server.listen(config.getPort());
+ }
+
+ @AfterEach
+ void tearDown()
+ {
+ vertx.close();
+ }
+
+ @DisplayName("Should return HTTP 200 OK when check=True")
+ @Test
+ public void testHealthCheckReturns200OK(VertxTestContext testContext)
+ {
+ check.setStatus(true);
+ service.refreshNow();
+
+ WebClient client = WebClient.create(vertx);
+
+ client.get(config.getPort(), "localhost", "/api/v1/__health")
+ .as(BodyCodec.string())
+ .send(testContext.succeeding(response -> testContext.verify(() -> {
+ System.out.println(response.statusCode());
+ Assert.assertEquals(200, response.statusCode());
+ testContext.completeNow();
+ })));
+ }
+
+ @DisplayName("Should return HTTP 503 Failure when check=False")
+ @Test
+ public void testHealthCheckReturns503Failure(VertxTestContext testContext)
+ {
+ check.setStatus(false);
+ service.refreshNow();
+
+ WebClient client = WebClient.create(vertx);
+
+ client.get(config.getPort(), "localhost", "/api/v1/__health")
+ .as(BodyCodec.string())
+ .send(testContext.succeeding(response -> testContext.verify(() -> {
+ System.out.println(response.statusCode());
+ Assert.assertEquals(503, response.statusCode());
+ testContext.completeNow();
+ })));
+ }
+}
diff --git a/src/test/java/org/apache/cassandra/sidecar/TestModule.java b/src/test/java/org/apache/cassandra/sidecar/TestModule.java
new file mode 100644
index 0000000..01061ba
--- /dev/null
+++ b/src/test/java/org/apache/cassandra/sidecar/TestModule.java
@@ -0,0 +1,99 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+import com.google.inject.Singleton;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.HttpServer;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.handler.LoggerHandler;
+import org.apache.cassandra.sidecar.mocks.MockHealthCheck;
+import org.apache.cassandra.sidecar.routes.HealthService;
+
+public class TestModule extends AbstractModule
+{
+ private Vertx vertx;
+
+ public TestModule(Vertx vertx)
+ {
+ this.vertx = vertx;
+ }
+
+ @Override
+ protected void configure()
+ {
+ bind(CassandraSidecarDaemon.class).in(Singleton.class);
+ }
+
+ @Provides
+ @Singleton
+ public Vertx getVertx()
+ {
+ return vertx;
+ }
+
+ @Provides
+ @Singleton
+ public HealthService healthService(Configuration config, MockHealthCheck check)
+ {
+ return new HealthService(config.getHealthCheckFrequencyMillis(), check);
+ }
+
+ @Provides
+ @Singleton
+ public MockHealthCheck healthCheck()
+ {
+ return new MockHealthCheck();
+ }
+
+ @Provides
+ @Singleton
+ public HttpServer vertxServer(Vertx vertx, Configuration config, Router router)
+ {
+ HttpServer server = vertx.createHttpServer(new HttpServerOptions()
+ .setPort(config.getPort())
+ .setLogActivity(true));
+ server.requestHandler(router);
+ return server;
+ }
+
+ @Provides
+ @Singleton
+ public Router vertxRouter(Vertx vertx, HealthService healthService)
+ {
+ Router router = Router.router(vertx);
+ router.route().handler(LoggerHandler.create());
+ router.route().path("/api/v1/__health").handler(healthService::handleHealth);
+ return router;
+ }
+
+ @Provides
+ @Singleton
+ public Configuration configuration()
+ {
+ return new Configuration(
+ "INVALID_FOR_TEST",
+ 0,
+ 6475,
+ 1000);
+ }
+}
diff --git a/src/test/java/org/apache/cassandra/sidecar/mocks/MockHealthCheck.java b/src/test/java/org/apache/cassandra/sidecar/mocks/MockHealthCheck.java
new file mode 100644
index 0000000..76a7280
--- /dev/null
+++ b/src/test/java/org/apache/cassandra/sidecar/mocks/MockHealthCheck.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.cassandra.sidecar.mocks;
+
+import java.util.function.Supplier;
+
+public class MockHealthCheck implements Supplier<Boolean>
+{
+ private volatile boolean status;
+
+ @Override
+ public Boolean get()
+ {
+ return status;
+ }
+
+ public void setStatus(boolean status)
+ {
+ this.status = status;
+ }
+}
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