check_response_time.sh

#!/bin/bash

# (c) 2008-2010, Roman Ovchinnikov aka CoolCold
# coolthecold@gmail.com


PROGNAME=$(basename $0)

#setting defaults
DEFAULT_INTERVAL=1
DEFAULT_ITERATIONS=$(( 60 * 60 * 2)) # 2 hours
DEFAULT_COMPRESSION=NO
DEFAULT_COOKIE=NO
DEFAULT_DUMP=NO
DATE_CMD="date +%s"


print_usage() {
    echo "Usage: $PROGNAME -u <url> [-C <cookie file>] [-c] [-i <interval>] [-I <iterations] [-D] [-S]"
    echo ""
    echo "-u <url> - something like http://fe.banners.mail.ru/js/show.js or http://assets0.github.com/stylesheets/bundle_common.css?2f7e714f544c24700e52868163f325fbc5239a18"
    echo "-C <cookie file> - file which contains cookies server may require, in curl format"
    echo "-c - enable compression support, so server may return gzipped content, for example"
    echo "-i <interval> - interval to do requests, in seconds"
    echo "-I <iterations> - how much requests should be taken"
    echo "-D - enable dump of headers for each request to stderr"
    echo "-S - show command being executed on stderr (command should be exact, but if in doubt, use bash -x /path/to/script)"
    echo "---"
    echo "Hint: use smth like 'cat show_flash.nginx_banners.txt|cut -f 2 -d \" \" |cut -f 2 -d \":\"|sort -n|uniq -c' to view largest times sets"
}

print_help() {
	echo "$PROGNAME"
	echo ""
	print_usage
	echo ""
	echo "This script tryes to connect to url and writeout connection/total times operation took."
	echo "It may be useful while testing how fast your webserver reponces on queries"
}

if [[ $# -eq "0"  ]];
then
	#no arguments were specified...very, very bad
	print_help
	exit 0
fi

#applying defaults
INTERVAL=$DEFAULT_INTERVAL
ITERATIONS=$DEFAULT_ITERATIONS
USE_COMPRESSION=$DEFAULT_COMPRESSION
COOKIE_FILE=$DEFAULT_COOKIE
URL=""
DUMP_HEADERS=$DEFAULT_DUMP
SHOW_COMMAND=NO

# Parse Arguments

while getopts ":hcDSu:i:I:C:" Option; do
        case $Option in
                h)
                        print_help
                        exit 0
                        ;;
		u)
			URL=${OPTARG}
			;;
		c)
			USE_COMPRESSION=YES
			;;
		i)
			INTERVAL=${OPTARG}
			;;
		I)	
			ITERATIONS=${OPTARG}
			;;
		C)
			COOKIE_FILE="${OPTARG}"
			;;
		D)
			DUMP_HEADERS="YES"
			;;
		S)
			SHOW_COMMAND="YES"
			;;
        	*)
			print_help
			exit 0
			;;
	esac
done
shift $(($OPTIND - 1))

#validating && translating

if [[ "x$URL" == "x" ]];then
	echo "URL must be specified!"
	print_usage
	exit 1
fi

if [[ "$USE_COMPRESSION" == "YES" ]];then
	COMPRESS_ARG="--compressed"
else
	COMPRESS_ARG=""
fi

COOKIE_ARG=""
if [[ "x$COOKIE_FILE" != "xNO" && "x$COOKIE_FILE" != "x" ]];then
	COOKIE_ARG="-b \"$COOKIE_FILE\""
        #COOKIE_PARAMS="$COOKIE_FILE"
fi

DUMP_ARG=""
if [[ "x$DUMP_HEADERS" == "xYES" ]];then
	DUMP_ARG="-D -"
fi


#requesting url in cycle
for i in $(seq 1 $ITERATIONS);do
	curdate=$($DATE_CMD)
	CURL_ARGS="-o /dev/null $COOKIE_ARG $COMPRESS_ARG $DUMP_ARG -w '%{time_total} %{time_connect}\n' $URL"
	if [[ "x$SHOW_COMMAND" == "xYES" ]];then
		echo "command is: curl $CURL_ARGS 2>/dev/null" 1>&2
	fi
	#CURL_DATA=$(eval curl "-o /dev/null $COOKIE_ARG $COMPRESS_ARG $DUMP_ARG -w '%{time_total} %{time_connect}\n' $URL" 2>/dev/null)
	CURL_DATA=$(eval curl "$CURL_ARGS" 2>/dev/null)
	EXT_CODE=$?
	if [[ $EXT_CODE -ne 0 ]];then
		if [[ $EXT_CODE -eq 127 ]];then #command not found
	    		echo "is curl installed? try \"sudo apt-get install curl\" to fix this";exit 1
		fi
	fi
	if [[ "x$CURL_DATA" = "x" ]]
	then
	    #empty curl data, way strange
	   echo "" >/dev/null #just placeholder for now
	else
		RESP_DATA=`echo "$CURL_DATA"|tail -n 1`
		if [[ "x$DUMP_ARG" != "x" ]];then
			#let's cut and show headers to stderr
			HEADERS=$(echo "$CURL_DATA"|head -n "-1")
			echo "$HEADERS" 1>&2 
		fi
		TOTAL_TIME=`echo $RESP_DATA|awk '{print $1}'`
		CONNECT_TIME=`echo $RESP_DATA|awk '{print $2}'`
		echo "time:$curdate ttime:$TOTAL_TIME conntime:$CONNECT_TIME"
   	fi
	sleep $INTERVAL
done