mongo backup shell

#!/usr/bin/env bash

server=""
port=""
database=""
username="backup"
password=""
s3bucket="backup/mongodb-rs-1"

mandrillkey=""
sendTo=""

main () {

        echo -e "Creating MongoDB dump";

        currdate=$( date +%Y-%m-%d_%H-%M )
        dumpOutput="all-databases"-$currdate
        filename=$dumpOutput".tar.gz"

        export PATH="$PATH:/usr/local/bin"

        mongodump --host $server --port $port --username $username --password $password --out $dumpOutput

        tar -zcvf $filename $dumpOutput

        # check if file exists
        if [[ ! -f $filename ]]; then

                #send_message "There was a problem with mongodb dump"
                return

        fi

        aws s3 cp $filename s3://$s3bucket/$filename

        rm $filename
        rm -rf $dumpOutput


}


send_message () {

        msg='{ "async": false, "key": "'$mandrillkey'", "message": { "from_email": "no-reply@onscroll.com", "from_name": "OnScroll", "headers": { "Reply-To": "dev@onscroll.com" }, "return_path_domain": null, "subject": "MongoDB backup error", "text": "'$1'", "to": [ { "email": "'$sendTo'", "type": "to" } ] } }'
        results=$(curl -A 'Mandrill-Curl/1.0' -d "$msg" 'https://mandrillapp.com/api/1.0/messages/send.json' -s 2>&1);
        echo "$results" | grep "sent" -q;
        if [ $? -ne 0 ]; then
                echo "An error occured: $results";
                exit 2;
        fi



}

file_size () {

        size=$(
                ${DU:-du}  --apparent-size --block-size=1 "$1" 2>/dev/null ||
                ${GDU:-gdu} --apparent-size --block-size=1 "$1" 2>/dev/null ||
                ${FIND:-find} "$1" -printf "%s" 2>/dev/null ||
                ${GFIND:-gfind} "$1" -printf "%s" 2>/dev/null ||
                ${STAT:-stat} --printf="%s" "$1" 2>/dev/null ||
                ${STAT:-stat} -f%z "$file" 2>/dev/null ||
                ${WC:-wc} -c <"$1" 2>/dev/null
        )
        q=$?; [ $q -eq 0 ] || exit $q

        echo "$size" | awk '{print $1}'

}