mirror of
https://github.com/jaygooby/ttfb.sh
synced 2025-12-10 07:57:21 +01:00
145 lines
4.4 KiB
Bash
Executable File
145 lines
4.4 KiB
Bash
Executable File
#!/bin/bash
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#
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# Based on a gist https://gist.github.com/sandeepraju/1f5fbdbdd89551ba7925abe2645f92b5
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# by https://github.com/sandeepraju
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#
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# Modified by jay@gooby.org, @jaygooby
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#
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# Usage: ttfb [options] url [url...]
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# -d debug
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# -l <log file> (infers -d)
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# -n number of times to test
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#
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# Examples:
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#
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# ttfb example.com
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# DNS lookup: 0.523402 TLS handshake: 0.000000 TTFB including connection: 0.692724 TTFB: .692724 Total time: 0.693508
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#
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# ttfb -n 5 example.com
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# min .203970 max .181486 median .190033
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#
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# ttfb -n 5 bbc.co.uk news.bbc.co.uk
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# bbc.co.uk min .032791 max .039401 median .029214
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# news.bbc.co.uk min .032927 max .032237 median .037458
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#
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# ttfb bbc.co.uk news.bbc.co.uk
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# bbc.co.uk DNS lookup: 0.005291 TLS handshake: 0.089403 TTFB including connection: 0.119651 TTFB: .030248 Total time: 0.506010
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# news.bbc.co.uk DNS lookup: 0.004266 TLS handshake: 0.077179 TTFB including connection: 0.110649 TTFB: .033470 Total time: 0.598472
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#
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# Implicitly follows redirects using curl's -L
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#
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# Log all response headers (default log file is curl.log) by calling with -d
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#
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# Override the default log file by specifying -l /some/file
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#
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# Get min, max and median values by specifying the number of times to call
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# the URL (-n2 etc)
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#
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# If you specify more than one url and have specified -d or -l the log file
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# will be prefixed with the URL being requested.
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#
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# See https://blog.cloudflare.com/a-question-of-timing/
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# and https://curl.haxx.se/docs/manpage.html for an explanation
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# of how the curl variables relate to the various stages of
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# the transfer.
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#
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# To get a better approximation of devtool's TTFB, consider
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# the time without the connection overhead:
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# %{time_starttransfer} - %{time_appconnect}
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#
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# Uses a dirty eval to do the ttfb arithmetic. Depends
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# on bc and column commands.
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set -eu
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# Cribbed from https://stackoverflow.com/a/41762669/391826
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median() {
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arr=($(printf '%s\n' "${@}" | sort -n))
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nel=${#arr[@]}
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if (( $nel % 2 == 1 )); then # Odd number of elements
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val="${arr[ $(($nel/2)) ]}"
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else # Even number of elements
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(( j=nel/2 ))
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(( k=j-1 ))
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# (( val=(${arr[j]} + ${arr[k]})/2 ))
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val=$(echo "scale=6;(${arr[j]}" + "${arr[k]})"/2|bc -l)
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fi
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echo $val
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}
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DEBUG=""
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LOG=""
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while getopts ":n:dl:" OPTION
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do
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case $OPTION in
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d) DEBUG=1 ;;
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l) LOG="$OPTARG" ;;
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n) NUM_REQUESTS=$OPTARG ;;
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\?) echo -e "tfb [options] url [url...]\n\t-d debug\n\t-l <log file> (infers -d)\n\t-n number of times to test the url" >&2
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exit 1
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;;
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esac
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done
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shift $((OPTIND - 1)) # shifts away every option argument,
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# leaving urls as $@
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if [ -z "$1" ]; then
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echo "You didn't specify any urls to fetch"
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exit 1
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else
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URLS="$@"
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fi
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# if we're given a custom log file, implicitly set DEBUG=1
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[ -n "$LOG" ] && DEBUG=1
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# default the log file to curl.log in pwd
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LOG="${LOG:-curl.log}"
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DEBUG=${DEBUG:-0}
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options=()
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options+=(-o /dev/null)
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options+=(-s)
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options+=(-L)
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options+=(--http2)
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options+=(-H 'Cache-Control: no-cache')
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options+=(-w 'echo DNS lookup: %{time_namelookup} TLS handshake: %{time_appconnect} TTFB including connection: %{time_starttransfer} TTFB: $(echo %{time_starttransfer} - %{time_appconnect} | bc) Total time: %{time_total} \n')
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if [ $DEBUG -eq 1 ]; then
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options+=(-D ${LOG})
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fi
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for URL in $URLS; do
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# if we're checking more than one url, and debug is set, then log
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# the headers to a per-url file
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if [[ ${#@} -gt 1 && $DEBUG -eq 1 ]]; then
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LOGFILE="${URL//[^[:alnum:]]/_}"
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options+=(-D "${LOGFILE}-${LOG}")
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fi
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# if we're checking more than one url
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# output it on the results line
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if [ ${#@} -gt 1 ]; then
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SHOW_URL="${URL}|"
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else
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SHOW_URL=""
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fi
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# if multiple requests have been specified, then show min, max & median values
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if [[ -n "$NUM_REQUESTS" && "$NUM_REQUESTS" -gt 1 ]]; then
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times=()
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for i in $(seq $NUM_REQUESTS); do
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printf "." >&2
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times+=($(eval $(curl "${options[@]}" "$URL") | grep -oE "TTFB: .{0,7}" | cut -d' ' -f2 | sort -n));
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done
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printf "\n" >&2
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# sort the times
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times=( $( printf "%s\n" "${times[@]}" | sort -n ) )
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# show quickest, slowest and median fftb
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printf "${SHOW_URL}\e[32mfastest \e[39m${times[0]} \e[91mslowest \e[39m${times[${#times[*]}-1]} \e[95mmedian \e[39m$(median ${times[*]})\e[39m\n";
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else
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echo -e $SHOW_URL $(eval $(curl "${options[@]}" "$URL"))
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fi
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done | column -s'|' -t
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