# GRAVITY SYNC BY VMSTAN #####################
# gs-hasing.sh ###############################

# For documentation or downloading updates visit https://github.com/vmstan/gravity-sync
# This code is called from the main gravity-sync.sh file and should not execute directly!

## Validate Sync Required
function md5_compare {
	HASHMARK='0'

	MESSAGE="Analyzing ${GRAVITY_FI} on ${REMOTE_HOST}"
	echo_stat
	primaryDBMD5=$(${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${PIHOLE_DIR}/${GRAVITY_FI}" | sed 's/\s.*$//') 
		error_validate
	
	MESSAGE="Analyzing ${GRAVITY_FI} on $HOSTNAME"
	echo_stat
	secondDBMD5=$(md5sum ${PIHOLE_DIR}/${GRAVITY_FI} | sed 's/\s.*$//')
		error_validate
	
	if [ "$primaryDBMD5" == "$last_primaryDBMD5" ] && [ "$secondDBMD5" == "$last_secondDBMD5" ]
	then
		HASHMARK=$((HASHMARK+0))
	else
		MESSAGE="Differenced ${GRAVITY_FI} Detected"
		echo_warn
		HASHMARK=$((HASHMARK+1))
	fi

	if [ "$SKIP_CUSTOM" != '1' ]
	then
		if [ -f ${PIHOLE_DIR}/${CUSTOM_DNS} ]
		then
			if ${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${PIHOLE_DIR}/${CUSTOM_DNS}
			then
				REMOTE_CUSTOM_DNS="1"
				MESSAGE="Analyzing ${CUSTOM_DNS} on ${REMOTE_HOST}"
				echo_stat

				primaryCLMD5=$(${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${PIHOLE_DIR}/${CUSTOM_DNS} | sed 's/\s.*$//'") 
					error_validate
				
				MESSAGE="Analyzing ${CUSTOM_DNS} on $HOSTNAME"
				echo_stat
				secondCLMD5=$(md5sum ${PIHOLE_DIR}/${CUSTOM_DNS} | sed 's/\s.*$//')
					error_validate
				
				if [ "$primaryCLMD5" == "$last_primaryCLMD5" ] && [ "$secondCLMD5" == "$last_secondCLMD5" ]
				then
					HASHMARK=$((HASHMARK+0))
				else
					MESSAGE="Differenced ${CUSTOM_DNS} Detected"
					echo_warn
					HASHMARK=$((HASHMARK+1))
				fi
			else
				MESSAGE="No ${CUSTOM_DNS} Detected on ${REMOTE_HOST}"
				echo_info
			fi
		else
			if ${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${PIHOLE_DIR}/${CUSTOM_DNS}
			then
				REMOTE_CUSTOM_DNS="1"
				MESSAGE="${REMOTE_HOST} has ${CUSTOM_DNS}"
				HASHMARK=$((HASHMARK+1))
				echo_info
			fi	
			MESSAGE="No ${CUSTOM_DNS} Detected on $HOSTNAME"
			echo_info
		fi
	fi

	if [ "$HASHMARK" != "0" ]
	then
		MESSAGE="Replication Required"
		echo_warn
		HASHMARK=$((HASHMARK+0))
	else
		MESSAGE="No Replication Required"
		echo_info
			exit_nochange
	fi
}

function previous_md5 {
	if [ -f "${LOG_PATH}/${HISTORY_MD5}" ]
	then
		last_primaryDBMD5=$(sed "1q;d" ${LOG_PATH}/${HISTORY_MD5})
		last_secondDBMD5=$(sed "2q;d" ${LOG_PATH}/${HISTORY_MD5})
		last_primaryCLMD5=$(sed "3q;d" ${LOG_PATH}/${HISTORY_MD5})
		last_secondCLMD5=$(sed "4q;d" ${LOG_PATH}/${HISTORY_MD5})
	else
		last_primaryDBMD5="0"
		last_secondDBMD5="0"
		last_primaryCLMD5="0"
		last_secondCLMD5="0"
	fi
}

function md5_recheck {
	MESSAGE="Performing Replicator Diagnostics"
	echo_info
	
	HASHMARK='0'

	MESSAGE="Reanalyzing ${GRAVITY_FI} on ${REMOTE_HOST}"
	echo_stat
	primaryDBMD5=$(${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${PIHOLE_DIR}/${GRAVITY_FI}" | sed 's/\s.*$//') 
		error_validate
	
	MESSAGE="Reanalyzing ${GRAVITY_FI} on $HOSTNAME"
	echo_stat
	secondDBMD5=$(md5sum ${PIHOLE_DIR}/${GRAVITY_FI} | sed 's/\s.*$//')
		error_validate

	if [ "$SKIP_CUSTOM" != '1' ]
	then
		if [ -f ${PIHOLE_DIR}/${CUSTOM_DNS} ]
		then
			if ${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${PIHOLE_DIR}/${CUSTOM_DNS}
			then
				REMOTE_CUSTOM_DNS="1"
				MESSAGE="Reanalyzing ${CUSTOM_DNS} on ${REMOTE_HOST}"
				echo_stat

				primaryCLMD5=$(${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${PIHOLE_DIR}/${CUSTOM_DNS} | sed 's/\s.*$//'") 
					error_validate
				
				MESSAGE="Reanalyzing ${CUSTOM_DNS} on $HOSTNAME"
				echo_stat
				secondCLMD5=$(md5sum ${PIHOLE_DIR}/${CUSTOM_DNS} | sed 's/\s.*$//')
					error_validate
			else
				MESSAGE="No ${CUSTOM_DNS} Detected on ${REMOTE_HOST}"
				echo_info
			fi
		else
			if ${SSHPASSWORD} ${SSH_CMD} -p ${SSH_PORT} -i "$HOME/${SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${PIHOLE_DIR}/${CUSTOM_DNS}
			then
				REMOTE_CUSTOM_DNS="1"
				MESSAGE="${REMOTE_HOST} has ${CUSTOM_DNS}"
				echo_info
			fi	
			MESSAGE="No ${CUSTOM_DNS} Detected on $HOSTNAME"
			echo_info
		fi
	fi
}