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percona-toolkit/bin/pt-stalk
Daniel Nichter 937c16c172 Convert env vars to cmd line opts. Use parse_options lib.
2011-11-29 11:54:47 -07:00

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#!/usr/bin/env bash
# This program is part of Percona Toolkit: http://www.percona.com/software/
# See "COPYRIGHT, LICENSE, AND WARRANTY" at the end of this file for legal
# notices and disclaimers.
# ###########################################################################
# log_warn_die package
# This package is a copy without comments from the original. The original
# with comments and its test file can be found in the Bazaar repository at,
# lib/bash/log_warn_die.sh
# t/lib/bash/log_warn_die.sh
# See https://launchpad.net/percona-toolkit for more information.
# ###########################################################################
set -u
EXIT_STATUS=0
log() {
TS=$(date +%F-%T | tr :- _);
echo "$TS $1"
}
warn() {
log "$1" >&2
EXIT_STATUS=$((EXIT_STATUS | 1))
}
die() {
warn "$1"
exit 1
}
# ###########################################################################
# End log_warn_die package
# ###########################################################################
# ###########################################################################
# parse_options package
# This package is a copy without comments from the original. The original
# with comments and its test file can be found in the Bazaar repository at,
# lib/bash/parse_options.sh
# t/lib/bash/parse_options.sh
# See https://launchpad.net/percona-toolkit for more information.
# ###########################################################################
set -u
declare -a ARGV # non-option args (probably input files)
declare EXT_ARGV # everything after -- (args for an external command)
OPT_ERR=${OPT_ERR:""}
usage() {
local file=$1
local usage=$(grep '^Usage: ' $file)
local opts=$(grep -A 2 '^=item --' $file | sed -e 's/^=item //' -e 's/^\([A-Z]\)/ \1/' -e 's/^--$//' > $TMPDIR/help)
if [ "$OPT_ERR" ]; then
echo "Error: ${OPT_ERR}" >&2
fi
echo $usage >&2
echo >&2
echo "Options:" >&2
echo >&2
cat $TMPDIR/help >&2
echo >&2
echo "For more information, 'man $TOOL' or 'perldoc $file'." >&2
}
parse_options() {
local file=$1
shift
local opt=""
local val=""
local default=""
local version=""
local i=0
awk '
/^=head1 OPTIONS/ {
getline
while ($0 !~ /^=head1/) {
if ($0 ~ /^=item --.*/) {
long_opt=substr($2, 3, length($2) - 2)
short_opt=""
required_arg=""
if ($3) {
if ($3 ~ /-[a-z]/)
short_opt=substr($3, 3, length($3) - 3)
else
required_arg=$3
}
if ($4 ~ /[A-Z]/)
required_arg=$4
getline # blank line
getline # short description line
if ($0 ~ /default: /) {
i=index($0, "default: ")
default=substr($0, i + 9, length($0) - (i + 9))
}
else
default=""
print long_opt "," short_opt "," required_arg "," default
}
getline
}
exit
}' $file > $TMPDIR/options
while read spec; do
opt=$(echo $spec | cut -d',' -f1 | sed 's/-/_/g' | tr [:lower:] [:upper:])
default=$(echo $spec | cut -d',' -f4)
eval "OPT_${opt}"="$default"
done < <(cat $TMPDIR/options)
for opt; do
if [ $# -eq 0 ]; then
break
fi
opt=$1
if [ "$opt" = "--" ]; then
shift
EXT_ARGV="$@"
break
fi
if [ "$opt" = "--version" ]; then
version=$(grep '^pt-[^ ]\+ [0-9]' $0)
echo "$version"
exit 0
fi
if [ "$opt" = "--help" ]; then
usage $file
exit 0
fi
shift
if [ $(expr "$opt" : "-") -eq 0 ]; then
ARGV[i]="$opt"
i=$((i+1))
continue
fi
opt=$(echo $opt | sed 's/^-*//')
spec=$(grep -E "^$opt,|,$opt," "$TMPDIR/options")
if [ -z "$spec" ]; then
die "Unknown option: $opt"
fi
opt=$(echo $spec | cut -d',' -f1)
required_arg=$(echo $spec | cut -d',' -f3)
val="yes"
if [ -n "$required_arg" ]; then
if [ $# -eq 0 ]; then
die "--$opt requires a $required_arg argument"
else
val="$1"
shift
fi
fi
opt=$(echo $opt | sed 's/-/_/g' | tr [:lower:] [:upper:])
eval "OPT_${opt}"="$val"
done
}
# ###########################################################################
# End parse_options package
# ###########################################################################
# ###########################################################################
# tmpdir package
# This package is a copy without comments from the original. The original
# with comments and its test file can be found in the Bazaar repository at,
# lib/bash/tmpdir.sh
# t/lib/bash/tmpdir.sh
# See https://launchpad.net/percona-toolkit for more information.
# ###########################################################################
set -u
TMPDIR=""
OPT_TMPDIR=${OPT_TMPDIR:""}
mk_tmpdir() {
if [ -n "$OPT_TMPDIR" ]; then
TMPDIR="$OPT_TMPDIR"
if [ ! -d "$TMPDIR" ]; then
mkdir $TMPDIR || die "Cannot make $TMPDIR"
fi
else
local tool=`basename $0`
local pid="$$"
TMPDIR=`mktemp -d /tmp/${tool}.${pid}.XXXXX` \
|| die "Cannot make secure tmpdir"
fi
}
rm_tmpdir() {
if [ -n "$TMPDIR" ] && [ -d "$TMPDIR" ]; then
rm -rf $TMPDIR
fi
TMPDIR=""
}
# ###########################################################################
# End tmpdir package
# ###########################################################################
# ###########################################################################
# Subroutines
# ###########################################################################
set +u
grep_processlist() {
local file=$1
local col=$2
local pat=${3:-""}
local gt=${4:-0}
local quiet=${5:-0}
awk "
BEGIN {
FS=\"|\"
OFS=\" | \"
n_cols=0
found=0
}
/^\|/ {
if ( n_cols ) {
val=colno_for_name[\"$col\"]
if ((\"$pat\" && match(\$val, \"$pat\")) || ($gt && \$val > $gt) ) {
found++
if (!$quiet) print \$0
}
}
else {
for (i = 1; i <= NF; i++) {
gsub(/^[ ]*/, \"\", \$i)
gsub(/[ ]*$/, \"\", \$i)
if ( \$i != \"\" ) {
name_for_colno[i]=\$i
colno_for_name[\$i]=i
n_cols++
}
}
}
}
END {
if ( found )
exit 0
exit 1
}
" $file
}
set_trg_func() {
if [ -f "$OPT_TRIGGER_FUNCTION" ]; then
source $OPT_TRIGGER_FUNCTION
TRIGGER_FUNCTION="trg_plugin"
else
TRIGGER_FUNCTION="trg_$OPT_TRIGGER_FUNCTION"
fi
}
trg_status() {
local var=$1
mysqladmin "$EXT_ARGV" extended-status | grep "$OPT_VARIABLE" | awk '{print $4}'
}
trg_processlist() {
local var=$1
local tmpfile="$TMPDIR/processlist"
mysqladmin "$EXT_ARGV" processlist > $tmpfile-1
grep_processlist $tmpfile-1 $var $OPT_MATCH 0 0 > $tmpfile-2
wc -l $tmpfile-2 | awk '{print $1}'
rm -rf $tmpfile*
return
}
trg_magic() {
echo "TODO"
return
}
# ###########################################################################
# Main program loop, called below if tool is ran from the command line.
# ###########################################################################
main() {
mk_tmpdir
parse_options $0 "$@"
# Make the collection location
# mkdir -p "$OPT_DEST" || die "Can't make the destination directory"
# test -d "$OPT_DEST" || die "$OPT_DEST isn't a directory"
# test -w "$OPT_DEST" || die "$OPT_DEST isn't writable"
# Test if we have root; warn if not, but it isn't critical.
if [ "$(id -u)" != "0" ]; then
echo 'Not running with root privileges!';
fi
# We increment this variable every time that the check is true,
# and set it to 0 if it's false.
local cycles_true=0
local matched="no"
set_trg_func
while true; do
# This is where we decide whether to execute 'collect'.
# The idea is to generate a number and store into $detected,
# and if $detected > $OPT_THRESHOLD, then we'll execute pt-collect.
local value=$($TRIGGER_FUNCTION $OPT_VARIABLE)
local trg_exit_status=$?
if [ -z "$value" ]; then
# No value. Maybe we failed to connect to MySQL?
warn "Detected value is empty; something failed? Trigger exit status: $trg_exit_status"
matched="no"
cycles_true=0
elif [ $value -gt $OPT_THRESHOLD ]; then
matched="yes"
cycles_true=$(($cycles_true + 1))
else
matched="no"
cycles_true=0
fi
log "Check results: $OPT_VARIABLE=$value, matched=$matched, cycles_true=$cycles_true"
if [ "$matched" = "yes" -a $cycles_true -ge $OPT_CYCLES ]; then
log "$OPT_COLLECT triggered"
# PREFIX="$(date +%F-%T | tr :- _)"
# echo "${NOTE}" > "${DEST}/${PREFIX}-trigger"
# Run pt-collect.
$OPT_COLLECT \
-i "$OPT_RUN_TIME" \
-g "$OPT_GDB" \
-o "$OPT_OPROFILE" \
-p "$OPT_PREFIX" \
-s "$OPT_STRACE" \
-t "$OPT_TCPDUMP" \
-f "$OPT_PCT_THRESHOLD" \
-m "$OPT_MB_THRESHOLD" \
-- "$EXT_ARGV"
log "Sleeping $OPT_SLEEP seconds to avoid DOS attack"
sleep $OPT_SLEEP
else
sleep $OPT_INTERVAL
fi
# Delete things more than $PURGE days old
#find "$OPT_DEST" -type f -mtime +$OPT_PURGE -exec rm -f '{}' \;
#find "/var/lib/oprofile/samples" -type d -name 'pt_collect_*' \
# -depth -mtime +$OPT_PURGE -exec rm -f '{}' \;
done
# Remove the secure tmpdir. This is not actually called because
# this tool runs forever.
rm_tmpdir
}
# Execute the program if it was not included from another file.
# This makes it possible to include without executing, and thus test.
if [ "$(basename "$0")" = "pt-stalk" ] || [ "$(basename "$0")" = "bash" -a "$_" = "$0" ]; then
main "$@"
fi
exit $EXIT_STATUS
# ############################################################################
# Documentation
# ############################################################################
:<<'DOCUMENTATION'
=pod
=head1 NAME
pt-stalk - Wait for a condition to occur then begin collecting data.
=head1 SYNOPSIS
Usage: pt-stalk [OPTIONS] [-- MYSQL OPTIONS]
pt-stalk watches for a condition to become true, and when it does, executes
a script. By default it executes L<pt-collect>, but that can be customized.
This tool is useful for gathering diagnostic data when an infrequent event
occurs, so an expert person can review the data later.
=head1 RISKS
The following section is included to inform users about the potential risks,
whether known or unknown, of using this tool. The two main categories of risks
are those created by the nature of the tool (e.g. read-only tools vs. read-write
tools) and those created by bugs.
pt-stalk is a read-only tool. It should be very low-risk.
At the time of this release, we know of no bugs that could cause serious harm
to users.
The authoritative source for updated information is always the online issue
tracking system. Issues that affect this tool will be marked as such. You can
see a list of such issues at the following URL:
L<http://www.percona.com/bugs/pt-stalk>.
See also L<"BUGS"> for more information on filing bugs and getting help.
=head1 DESCRIPTION
Although pt-stalk comes pre-configured to do a specific thing, in general
this tool is just a skeleton script for the following flow of actions:
=over
=item 1.
Loop infinitely, sleeping between iterations.
=item 2.
In each iteration, run some command and get the output.
=item 3.
If the command fails or the output is larger than the threshold,
execute the collection script; but do not execute if the destination disk
is too full.
=back
By default, the tool is configured to execute mysqladmin extended-status and
extract the value of the Threads_running variable; if this is greater than
25, it runs the collection script. This is really just placeholder code,
and almost certainly needs to be customized!
If the tool does execute the collection script, it will wait for a while
before checking and executing again. This is to prevent a continuous
condition from causing a huge number of executions to fire off.
The name 'stalk' is because 'watch' is already taken, and 'stalk' is fun.
=head1 CONFIGURING
TODO
=head1 OPTIONS
=over
=item --collect DIRECTORY
Location of the C<collect> tool. (default: ${HOME}/bin/pt-collect)
=item --cycles N
Number of times condition must be met before triggering collection. (default: 5)
=item --dest DIRECTORY
Where to store collected data.
=item --disk-byte-limit MEGABYTES
Exit if the disk has less than this many MB free. (default: 100)
=item --disk-pct-limit PERCENT
Exit if the disk is less than this %full. (default: 5)
=item --email ADDRESS
Send mail to this list of addresses when the script triggers.
=item --gdb
Collect GDB stacktraces.
=item --help
Print help and exit.
=item --interval SECONDS
Interval between checks. (default: 1)
=item --match PATTERN
Match pattern for C<processles> L<"--trigger-function">.
=item --oprofile
Collect oprofile data. (default: yes)
=item --purge DAYS
Remove samples after this many days. (default: 30)
=item --run-time SECONDS
How long to collect statistics data for? (default: 30)
Make sure that this isn't longer than SLEEP.
=item --strace
Collect strace data.
=item --sleep SECONDS
How long to sleep after collecting? (default: 300)
=item --tcpdump
Collect tcpdump data? (default: yes)
=item --trigger-function
Built-in function name or plugin file name which returns the value of C<VARIABLE>. (default: status)
Possible values are:
=over
=item * status
Grep the value of C<VARIABLE> from C<mysqladmin extended-status>.
=item * processlist
Count the number of processes in C<mysqladmin processlist> whose
C<VARIABLE> column matches C<MATCH>. For example:
TRIGGER_FUNCTION="processlist" \
VARIABLE="State" \
MATCH="statistics" \
THRESHOLD="10"
The above triggers when more than 10 processes are in the "statistics" state.
C<MATCH> must be specified for this trigger function.
=item * magic
TODO
=item * plugin file name
A plugin file allows you to specify a custom trigger function. The plugin
file must contain a function called C<trg_plugin>. For example:
trg_plugin() {
# Do some stuff.
echo "$value"
}
The last output if the function (its "return value") must be a number.
This number is compared to C<THRESHOLD>. All L<"ENVIRONMENT"> variables
are available to the function.
Do not alter the tool's existing global variables. Prefix any plugin-specific
global variables with "PLUGIN_".
=back
=item --threshold N
Max number of C<N> to tolerate. (default: 25)
=item --variable NAME
This is the thing to check for. (default: Threads_running)
=item --version
Print tool's version and exit.
=back
=head1 ENVIRONMENT
No env vars used.
=head1 SYSTEM REQUIREMENTS
This tool requires Bash v3 or newer.
=head1 BUGS
For a list of known bugs, see L<http://www.percona.com/bugs/pt-stalk>.
Please report bugs at L<https://bugs.launchpad.net/percona-toolkit>.
Include the following information in your bug report:
=over
=item * Complete command-line used to run the tool
=item * Tool L<"--version">
=item * MySQL version of all servers involved
=item * Output from the tool including STDERR
=item * Input files (log/dump/config files, etc.)
=back
If possible, include debugging output by running the tool with C<PTDEBUG>;
see L<"ENVIRONMENT">.
=head1 DOWNLOADING
Visit L<http://www.percona.com/software/percona-toolkit/> to download the
latest release of Percona Toolkit. Or, get the latest release from the
command line:
wget percona.com/get/percona-toolkit.tar.gz
wget percona.com/get/percona-toolkit.rpm
wget percona.com/get/percona-toolkit.deb
You can also get individual tools from the latest release:
wget percona.com/get/TOOL
Replace C<TOOL> with the name of any tool.
=head1 AUTHORS
Baron Schwartz, Justin Swanhart, Fernando Ipar, and Daniel Nichter
=head1 ABOUT PERCONA TOOLKIT
This tool is part of Percona Toolkit, a collection of advanced command-line
tools developed by Percona for MySQL support and consulting. Percona Toolkit
was forked from two projects in June, 2011: Maatkit and Aspersa. Those
projects were created by Baron Schwartz and developed primarily by him and
Daniel Nichter, both of whom are employed by Percona. Visit
L<http://www.percona.com/software/> for more software developed by Percona.
=head1 COPYRIGHT, LICENSE, AND WARRANTY
This program is copyright 2010-2011 Baron Schwartz, 2011 Percona Inc.
Feedback and improvements are welcome.
THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
systems, you can issue `man perlgpl' or `man perlartistic' to read these
licenses.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA.
=head1 VERSION
pt-stalk 2.0.0
=cut
DOCUMENTATION
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