mirror of
https://github.com/percona/percona-toolkit.git
synced 2025-09-09 07:30:02 +00:00
Implement --daemonize, --log, and --pid. Catch signals. Merge lp:~daniel-nichter/percona-toolkit/bash-tool-libs r117. Set -u globally. Fix --interval specs. Refactor internals more.
This commit is contained in:
Daniel Nichter
255
bin/pt-stalk
255
bin/pt-stalk
@@ -4,6 +4,8 @@
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# See "COPYRIGHT, LICENSE, AND WARRANTY" at the end of this file for legal
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# notices and disclaimers.
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set -u
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# ###########################################################################
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# log_warn_die package
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# This package is a copy without comments from the original. The original
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@@ -13,8 +15,6 @@
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# See https://launchpad.net/percona-toolkit for more information.
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# ###########################################################################
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set -u
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EXIT_STATUS=0
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log() {
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@@ -45,8 +45,6 @@ die() {
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# See https://launchpad.net/percona-toolkit for more information.
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# ###########################################################################
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set -u
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declare -a ARGV # non-option args (probably input files)
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declare EXT_ARGV # everything after -- (args for an external command)
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OPT_ERR=${OPT_ERR:""}
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@@ -55,17 +53,12 @@ usage() {
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local file=$1
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local usage=$(grep '^Usage: ' $file)
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local opts=$(grep -A 2 '^=item --' $file | sed -e 's/^=item //' -e 's/^\([A-Z]\)/ \1/' -e 's/^--$//' > $TMPDIR/help)
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if [ "$OPT_ERR" ]; then
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echo "Error: ${OPT_ERR}" >&2
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fi
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echo $usage >&2
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echo >&2
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echo "Options:" >&2
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echo >&2
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cat $TMPDIR/help >&2
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echo >&2
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echo "For more information, 'man $TOOL' or 'perldoc $file'." >&2
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}
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@@ -73,57 +66,79 @@ parse_options() {
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local file=$1
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shift
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local opt=""
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local val=""
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local default=""
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local version=""
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local i=0
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awk '
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mkdir $TMPDIR/po/ 2>/dev/null
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rm -rf $TMPDIR/po/*
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awk -v "po_dir"="$TMPDIR/po" '
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/^=head1 OPTIONS/ {
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getline
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while ($0 !~ /^=head1/) {
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if ($0 ~ /^=item --.*/) {
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long_opt=substr($2, 3, length($2) - 2)
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short_opt=""
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required_arg=""
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if ($3) {
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if ($3 ~ /-[a-z]/)
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short_opt=substr($3, 3, length($3) - 3)
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else
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required_arg=$3
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}
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if ($4 ~ /[A-Z]/)
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required_arg=$4
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long_opt = substr($2, 3, length($2) - 2)
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spec_file = po_dir "/" long_opt
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trf = "sed -e \"s/[ ]//g\" | tr \";\" \"\n\" > " spec_file
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getline # blank line
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getline # short description line
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getline # specs or description
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if ($0 ~ /default: /) {
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i=index($0, "default: ")
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default=substr($0, i + 9, length($0) - (i + 9))
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if ($0 ~ /^[a-z]/ ) {
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print "long:" long_opt "; " $0 | trf
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close(trf)
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}
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else {
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print "long:" long_opt > spec_file
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close(spec_file)
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}
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else
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default=""
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print long_opt "," short_opt "," required_arg "," default
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}
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getline
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}
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exit
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}' $file > $TMPDIR/options
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}' $file
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while read spec; do
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opt=$(echo $spec | cut -d',' -f1 | sed 's/-/_/g' | tr [:lower:] [:upper:])
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default=$(echo $spec | cut -d',' -f4)
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eval "OPT_${opt}"="$default"
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done < <(cat $TMPDIR/options)
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for opt_spec in $(ls $TMPDIR/po/); do
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local opt=""
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local default_val=""
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local neg=0
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while read line; do
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local key=`echo $line | cut -d ':' -f 1`
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local val=`echo $line | cut -d ':' -f 2`
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case "$key" in
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long)
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opt=$(echo $val | sed 's/-/_/g' | tr [:lower:] [:upper:])
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;;
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default)
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default_val="$val"
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;;
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shortform)
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;;
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type)
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;;
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negatable)
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if [ "$val" = "yes" ]; then
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neg=1
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fi
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;;
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*)
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die "Invalid attribute in $TMPDIR/po/$opt_spec: $line"
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esac
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done < $TMPDIR/po/$opt_spec
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if [ -z "$opt" ]; then
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die "No long attribute in option spec $TMPDIR/po/$opt_spec"
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fi
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if [ $neg -eq 1 ]; then
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if [ -z "$default_val" ] || [ "$default_val" != "yes" ]; then
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die "Option $opt_spec is negatable but not default: yes"
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fi
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fi
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eval "OPT_${opt}"="$default_val"
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done
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local i=0 # ARGV index
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for opt; do
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if [ $# -eq 0 ]; then
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break
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break # no more opts
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fi
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opt=$1
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if [ "$opt" = "--" ]; then
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@@ -140,30 +155,51 @@ parse_options() {
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usage $file
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exit 0
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fi
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shift
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shift
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if [ $(expr "$opt" : "-") -eq 0 ]; then
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ARGV[i]="$opt"
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i=$((i+1))
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continue
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fi
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opt=$(echo $opt | sed 's/^-*//')
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spec=$(grep -E "^$opt,|,$opt," "$TMPDIR/options")
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if [ -z "$spec" ]; then
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die "Unknown option: $opt"
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local real_opt="$opt"
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if $(echo $opt | grep -q '^--no-'); then
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neg=1
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opt=$(echo $opt | sed 's/^--no-//')
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else
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neg=0
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opt=$(echo $opt | sed 's/^-*//')
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fi
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opt=$(echo $spec | cut -d',' -f1)
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required_arg=$(echo $spec | cut -d',' -f3)
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val="yes"
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if [ -f "$TMPDIR/po/$opt" ]; then
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spec="$TMPDIR/po/$opt"
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else
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spec=$(grep "^shortform:-$opt\$" $TMPDIR/po/* | cut -d ':' -f 1)
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if [ -z "$spec" ]; then
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die "Unknown option: $opt"
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fi
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fi
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required_arg=$(cat $spec | grep '^type:' | cut -d':' -f2)
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if [ -n "$required_arg" ]; then
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if [ $# -eq 0 ]; then
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die "--$opt requires a $required_arg argument"
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die "$real_opt requires a $required_arg argument"
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else
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val="$1"
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shift
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fi
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else
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if [ $neg -eq 0 ]; then
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val="yes"
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else
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val="no"
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fi
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fi
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opt=$(echo $opt | sed 's/-/_/g' | tr [:lower:] [:upper:])
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eval "OPT_${opt}"="$val"
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opt=$(cat $spec | grep '^long:' | cut -d':' -f2 | sed 's/-/_/g' | tr [:lower:] [:upper:])
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eval "OPT_$opt"="$val"
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done
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}
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@@ -180,8 +216,6 @@ parse_options() {
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# See https://launchpad.net/percona-toolkit for more information.
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# ###########################################################################
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set -u
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TMPDIR=""
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OPT_TMPDIR=${OPT_TMPDIR:""}
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@@ -219,7 +253,6 @@ ITER=0
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# ###########################################################################
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# Subroutines
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# ###########################################################################
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set +u
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grep_processlist() {
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local file=$1
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@@ -308,7 +341,7 @@ oktorun() {
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sleep_ok() {
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local seconds=$1
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local msg=$2
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local msg=${2:""}
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if oktorun; then
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if [ -n "$msg" ]; then
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log $msg
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@@ -325,6 +358,16 @@ purge_samples() {
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:
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}
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sigtrap() {
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if [ $OKTORUN -eq 1 ]; then
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warn "Caught signal, exiting"
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OKTORUN=0
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else
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warn "Caught signal again, forcing exit"
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exit $EXIT_STATUS
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fi
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}
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collect() {
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log "$OPT_COLLECT triggered"
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ITER=$((ITER + 1))
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@@ -344,34 +387,13 @@ collect() {
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-- "$EXT_ARGV"
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}
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# ###########################################################################
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# Main program loop, called below if tool is ran from the command line.
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# ###########################################################################
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main() {
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mk_tmpdir
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parse_options $0 "$@"
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# Make the collection location
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# mkdir -p "$OPT_DEST" || die "Can't make the destination directory"
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# test -d "$OPT_DEST" || die "$OPT_DEST isn't a directory"
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# test -w "$OPT_DEST" || die "$OPT_DEST isn't writable"
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# Test if we have root; warn if not, but it isn't critical.
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if [ "$(id -u)" != "0" ]; then
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log 'Not running with root privileges!';
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fi
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stalk() {
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# We increment this variable every time that the check is true,
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# and set it to 0 if it's false.
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local cycles_true=0
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local matched="no"
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# Set TRIGGER_FUNCTION based on --function.
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set_trg_func
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while oktorun; do
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# This is where we decide whether to execute 'collect'.
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# The idea is to generate a number and store into $detected,
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# and if $detected > $OPT_THRESHOLD, then we'll execute pt-collect.
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@@ -395,26 +417,75 @@ main() {
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if [ "$matched" = "yes" -a $cycles_true -ge $OPT_CYCLES ]; then
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collect
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sleep_ok $OPT_SLEEP "Sleeping $OPT_SLEEP seconds to avoid DOS attack"
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sleep_ok "$OPT_SLEEP" "Sleeping $OPT_SLEEP seconds to avoid DOS attack"
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else
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sleep_ok $OPT_INTERVAL
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sleep_ok "$OPT_INTERVAL"
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fi
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purge_samples
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done
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}
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# Remove the secure tmpdir. This is not actually called because
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# this tool runs forever.
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# ###########################################################################
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# Main program loop, called below if tool is ran from the command line.
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# ###########################################################################
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main() {
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trap sigtrap SIGHUP SIGINT SIGTERM
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# Note: $$ is the parent's PID, but we're a child proc.
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# Bash 4 has $BASHPID but we can't rely on that. Consequently,
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# we don't know our own PID. See the usage of $! below.
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log "$0 started"
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# Make a secure tmpdir.
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mk_tmpdir
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# Make the collection location
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# mkdir -p "$OPT_DEST" || die "Can't make the destination directory"
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# test -d "$OPT_DEST" || die "$OPT_DEST isn't a directory"
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# test -w "$OPT_DEST" || die "$OPT_DEST isn't writable"
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# Test if we have root; warn if not, but it isn't critical.
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if [ "$(id -u)" != "0" ]; then
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log 'Not running with root privileges!';
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fi
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# Set TRIGGER_FUNCTION based on --function.
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set_trg_func
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# Stalk while oktorun.
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stalk
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# Remove the secure tmpdir.
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rm_tmpdir
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log "$0 exit status $EXIT_STATUS"
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exit $EXIT_STATUS
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}
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# Execute the program if it was not included from another file.
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# This makes it possible to include without executing, and thus test.
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if [ "$(basename "$0")" = "pt-stalk" ] || [ "$(basename "$0")" = "bash" -a "$_" = "$0" ]; then
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main "$@"
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fi
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if [ "$(basename "$0")" = "pt-stalk" ] \
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|| [ "$(basename "$0")" = "bash" -a "$_" = "$0" ]; then
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exit $EXIT_STATUS
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# Parse command line options. We must do this first so we can
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# see if --daemonize was specified.
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mk_tmpdir
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parse_options $0 "$@"
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rm_tmpdir
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if [ "$OPT_DAEMONIZE" = "yes" ]; then
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main "$@" </dev/null 1>>$OPT_LOG 2>&1 &
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# The child PID is $BASHPID but that special var is only
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# in Bash 4+, so we can't rely on it. Consequently, we
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# use $! to get the PID of the child we just forked.
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echo "$!" > $OPT_PID
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else
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main "$@"
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fi
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fi
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# ############################################################################
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# Documentation
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@@ -608,9 +679,11 @@ global variables with "PLUGIN_".
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Print help and exit.
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=item --interval SECONDS
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=item --interval
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Interval between checks. (default: 1)
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type: int; default: 1
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Interval between checks.
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=item --iterations
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