#!/bin/bash
# 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.

if [ $# -lt 1 ];
then
  echo "USAGE: $0 [-daemon] [-name servicename] [-loggc] classname [opts]"
  exit 1
fi

# CYGINW == 1 if Cygwin is detected, else 0.
if [[ $(uname -a) =~ "CYGWIN" ]]; then
  CYGWIN=1
else
  CYGWIN=0
fi

if [ -z "$INCLUDE_TEST_JARS" ]; then
  INCLUDE_TEST_JARS=false
fi

# Exclude jars not necessary for running commands.
regex="(-(test|src|scaladoc|javadoc)\.jar|jar.asc)$"
should_include_file() {
  if [ "$INCLUDE_TEST_JARS" = true ]; then
    return 0
  fi
  file=$1
  if [ -z "$(echo "$file" | egrep "$regex")" ] ; then
    return 0
  else
    return 1
  fi
}

base_dir=$(dirname $0)/..

if [ -z "$SCALA_VERSION" ]; then
  SCALA_VERSION=2.11.11
fi

if [ -z "$SCALA_BINARY_VERSION" ]; then
  SCALA_BINARY_VERSION=$(echo $SCALA_VERSION | cut -f 1-2 -d '.')
fi

# run ./gradlew copyDependantLibs to get all dependant jars in a local dir
shopt -s nullglob
for dir in "$base_dir"/core/build/dependant-libs-${SCALA_VERSION}*;
do
  if [ -z "$CLASSPATH" ] ; then
    CLASSPATH="$dir/*"
  else
    CLASSPATH="$CLASSPATH:$dir/*"
  fi
done

for file in "$base_dir"/examples/build/libs/kafka-examples*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for file in "$base_dir"/clients/build/libs/kafka-clients*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for file in "$base_dir"/streams/build/libs/kafka-streams*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for file in "$base_dir"/streams/examples/build/libs/kafka-streams-examples*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for file in "$base_dir"/streams/build/dependant-libs-${SCALA_VERSION}/rocksdb*.jar;
do
  CLASSPATH="$CLASSPATH":"$file"
done

for file in "$base_dir"/tools/build/libs/kafka-tools*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for dir in "$base_dir"/tools/build/dependant-libs-${SCALA_VERSION}*;
do
  CLASSPATH="$CLASSPATH:$dir/*"
done

for cc_pkg in "api" "transforms" "runtime" "file" "json" "tools"
do
  for file in "$base_dir"/connect/${cc_pkg}/build/libs/connect-${cc_pkg}*.jar;
  do
    if should_include_file "$file"; then
      CLASSPATH="$CLASSPATH":"$file"
    fi
  done
  if [ -d "$base_dir/connect/${cc_pkg}/build/dependant-libs" ] ; then
    CLASSPATH="$CLASSPATH:$base_dir/connect/${cc_pkg}/build/dependant-libs/*"
  fi
done

# classpath addition for release
for file in "$base_dir"/libs/*;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done

for file in "$base_dir"/core/build/libs/kafka_${SCALA_BINARY_VERSION}*.jar;
do
  if should_include_file "$file"; then
    CLASSPATH="$CLASSPATH":"$file"
  fi
done
shopt -u nullglob

# JMX settings
if [ -z "$KAFKA_JMX_OPTS" ]; then
  KAFKA_JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false  -Dcom.sun.management.jmxremote.ssl=false "
fi

# JMX port to use
if [  $JMX_PORT ]; then
  KAFKA_JMX_OPTS="$KAFKA_JMX_OPTS -Dcom.sun.management.jmxremote.port=$JMX_PORT "
fi

# Log directory to use
if [ "x$LOG_DIR" = "x" ]; then
  LOG_DIR="$base_dir/logs"
fi

# Log4j settings
if [ -z "$KAFKA_LOG4J_OPTS" ]; then
  # Log to console. This is a tool.
  LOG4J_DIR="$base_dir/config/tools-log4j.properties"
  # If Cygwin is detected, LOG4J_DIR is converted to Windows format.
  (( CYGWIN )) && LOG4J_DIR=$(cygpath --path --mixed "${LOG4J_DIR}")
  KAFKA_LOG4J_OPTS="-Dlog4j.configuration=file:${LOG4J_DIR}"
else
  # create logs directory
  if [ ! -d "$LOG_DIR" ]; then
    mkdir -p "$LOG_DIR"
  fi
fi

# If Cygwin is detected, LOG_DIR is converted to Windows format.
(( CYGWIN )) && LOG_DIR=$(cygpath --path --mixed "${LOG_DIR}")
KAFKA_LOG4J_OPTS="-Dkafka.logs.dir=$LOG_DIR $KAFKA_LOG4J_OPTS"

# Generic jvm settings you want to add
if [ -z "$KAFKA_OPTS" ]; then
  KAFKA_OPTS=""
fi

# Set Debug options if enabled
if [ "x$KAFKA_DEBUG" != "x" ]; then

    # Use default ports
    DEFAULT_JAVA_DEBUG_PORT="5005"

    if [ -z "$JAVA_DEBUG_PORT" ]; then
        JAVA_DEBUG_PORT="$DEFAULT_JAVA_DEBUG_PORT"
    fi

    # Use the defaults if JAVA_DEBUG_OPTS was not set
    DEFAULT_JAVA_DEBUG_OPTS="-agentlib:jdwp=transport=dt_socket,server=y,suspend=${DEBUG_SUSPEND_FLAG:-n},address=$JAVA_DEBUG_PORT"
    if [ -z "$JAVA_DEBUG_OPTS" ]; then
        JAVA_DEBUG_OPTS="$DEFAULT_JAVA_DEBUG_OPTS"
    fi

    echo "Enabling Java debug options: $JAVA_DEBUG_OPTS"
    KAFKA_OPTS="$JAVA_DEBUG_OPTS $KAFKA_OPTS"
fi


calculate_heap_sizes()
{
    system_memory_in_mb=`free -m | awk '/:/ {print $2;exit}'`

    # set max heap size based on the following
    # min(1/2 ram, 4096MB)
    half_system_memory_in_mb=`expr $system_memory_in_mb / 2`
    if [ "$half_system_memory_in_mb" -lt "4096" ]
    then
        max_heap_size_in_mb="$half_system_memory_in_mb"
    else
        max_heap_size_in_mb="4096"
    fi
    MAX_HEAP_SIZE="${max_heap_size_in_mb}M"
}

# Which java to use
if [ -z "$JAVA_HOME" ]; then
  JAVA="java"
else
  JAVA="$JAVA_HOME/bin/java"
fi

# Memory options
calculate_heap_sizes
KAFKA_HEAP_OPTS="-Xms${MAX_HEAP_SIZE} -Xmx${MAX_HEAP_SIZE}"

# JVM performance options
if [ -z "$KAFKA_JVM_PERFORMANCE_OPTS" ]; then
  KAFKA_JVM_PERFORMANCE_OPTS="-server -XX:+UseG1GC -XX:G1HeapRegionSize=16M -XX:MetaspaceSize=96m -XX:MinMetaspaceFreeRatio=50 -XX:MaxMetaspaceFreeRatio=80 -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:+DisableExplicitGC -Djava.awt.headless=true"
fi

# Agents

while [ $# -gt 0 ]; do
  COMMAND=$1
  case $COMMAND in
    -name)
      DAEMON_NAME=$2
      CONSOLE_OUTPUT_FILE=$LOG_DIR/$DAEMON_NAME.out
      shift 2
      ;;
    -loggc)
      if [ -z "$KAFKA_GC_LOG_OPTS" ]; then
        GC_LOG_ENABLED="true"
      fi
      shift
      ;;
    -daemon)
      DAEMON_MODE="true"
      shift
      ;;
    *)
      break
      ;;
  esac
done

JMX_TRANS_AGENT="-javaagent:/opt/jmxtrans/jmxtrans.jar=/opt/jmxtrans/jmxtrans-agent-${DAEMON_NAME}.xml"

# GC options
GC_FILE_SUFFIX='-gc.log'
GC_LOG_FILE_NAME=''
if [ "x$GC_LOG_ENABLED" = "xtrue" ]; then
  GC_LOG_FILE_NAME=$DAEMON_NAME$GC_FILE_SUFFIX
  KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M"
fi

# If Cygwin is detected, classpath is converted to Windows format.
(( CYGWIN )) && CLASSPATH=$(cygpath --path --mixed "${CLASSPATH}")

# Launch mode
if [ "x$DAEMON_MODE" = "xtrue" ]; then
  nohup $JAVA $KAFKA_HEAP_OPTS $KAFKA_JVM_PERFORMANCE_OPTS $JMX_TRANS_AGENT $KAFKA_GC_LOG_OPTS $KAFKA_JMX_OPTS $KAFKA_LOG4J_OPTS -cp $CLASSPATH $KAFKA_OPTS "$@" > "$CONSOLE_OUTPUT_FILE" 2>&1 < /dev/null &
else
  exec $JAVA $KAFKA_HEAP_OPTS $KAFKA_JVM_PERFORMANCE_OPTS $JMX_TRANS_AGENT $KAFKA_GC_LOG_OPTS $KAFKA_JMX_OPTS $KAFKA_LOG4J_OPTS -cp $CLASSPATH $KAFKA_OPTS "$@"
fi
