start & stop a local dynamodb for fun and profit

local_db.sh

#!/usr/bin/env bash

set -e

function install_dynamodb_local {
    if [ ! -e "db/DynamoDBLocal.jar" ]; then
        echo "Downloading DynamoDBLocal"
        mkdir -p db && cd db
        curl "https://s3.eu-central-1.amazonaws.com/dynamodb-local-frankfurt/dynamodb_local_latest.tar.gz" -s | tar -xz
        cd ..
    fi;
}

function goto_workdir {
    mkdir -p build
    cd build
}

function start_server {
    java -jar db/DynamoDBLocal.jar >> db.log 2>> db.error.log &
    echo $! > db.pid
}

function stop_old_server {
    if [ -e db.pid ]; then
        PID=$(cat db.pid)
        if [ "${PID}" -ne 0 ]; then
            echo "sending TERM to ${PID} to stop old db"
            kill "${PID}"
            rm db.pid
        else
            echo "PID is 0, thats not good"
        fi
    fi
}

goto_workdir
case $1 in
    "stop")
        stop_old_server
        ;;
    "start"|*)
        install_dynamodb_local
        stop_old_server
        start_server
        ;;
esac;