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Merge pull request #1635 from hu-weihua/codetemplate
A template for probe sub command development which need to handle hierarchical scenario
This commit is contained in:
zet809
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410
xCAT-probe/subcmds/code_template
Executable file
410
xCAT-probe/subcmds/code_template
Executable file
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#!/usr/bin/perl
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# IBM(c) 2016 EPL license http://www.eclipse.org/legal/epl-v10.html
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#--------------------------------------------------------
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#This is a template for developing a probe sub_command.
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#This template mainly implement the sub_comamd dispatch in hierarchical structure
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#Developer only need to focus on main probe job (by implement do_main_job function) and friendly output (by implement summary_all_jobs_output function) for user
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#This template can also be used in flat structure. but if developer think it's too heavy in flat, it's fine to develop sub command directly.
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#But in hierarchical structure, we strongly recommand using this template.
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#The main dispatch policy are:
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#1. if there isn't noderange input from commmand line. if there are service nodes defined in current MN,
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# we dispatch exact same command input from STDIN to all SNs and current MN. if there isn't service nodes defined,
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# just hanld command input from STDIN in current MN
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#2. If there is noderange input from command line by opion "-n", we will dispatch the command input from STDIN to SN which can hanle these ndoes
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# For example, if we got command from STDIN like "probecommand -n test[1-15] -V" and test[1-5] 's SN is SN1, test[6-10]'s SN is SN2
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# The dispatch result will be:
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# For MN run: probecommand -n test[11-15] -V
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# For SN1 run: probecommand -n test[1-5] -V
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# For SN2 run: probecommand -n test[6-10] -V
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#3. All the return message from SNs and MN will be saved in hash %summaryoutput, develper can use it while implement summary_all_jobs_output function
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#--------------------------------------------------------
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BEGIN { $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : -d '/opt/xcat' ? '/opt/xcat' : '/usr'; }
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use lib "$::XCATROOT/probe/lib/perl";
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use probe_utils;
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use xCAT::ServiceNodeUtils;
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use File::Basename;
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use Getopt::Long qw(:config no_ignore_case);
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use IO::Select;
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use Data::Dumper;
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my $program_name = basename("$0"); #current sub_command name
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my $help = 0; #command line attribute '-h', get usage information
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my $test = 0; #command line attribute '-T'
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my $verbose = 0; #command line attribute '-V'
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my $noderange; #command line attribute '-n'
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my $output = "stdout"; #used by probe_utils->send_msg("$output", "o", "xxxxxxxxxx"); print output to STDOUT
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my $is_sn = 0; #flag current server is SN
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my $rst = 0; #the exit code of current command
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my $terminal = 0; #means get INT signal from STDIN
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#save all output from commands running on SNs and MN
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# one example:
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# $summaryoutput{mn} = @mn_output_history
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# $summaryoutput{SN1} = @SN1_output_history
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my %summaryoutput;
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#a map of SNs and command which will be dispatched to current SN
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# one example:
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# $dispatchcmd{SN1} = "probecommand -n test[1-5] -V"
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# $dispatchcmd{SN2} = "probecommand -n test[6-10] -V"
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my %dispatchcmd;
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#save command line attributes from STDIN
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my @tmpargv;
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#--------------------------------
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# below are some options rules used by default
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# -h : Get usage information of current sub command
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# -V : Output more information for debug
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# -T : To verify if $program_name can work, reserve option for probe framework, dosen't use by customer
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# -n : In xCAT probe, -n is uesd to specify node range uniformly
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#--------------------------------
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$::USAGE = "Usage:
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$program_name -h
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$program_name [-V]
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Description:
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This is a template for developing a probe sub_command.
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<# ADD DESCRIPTION FOR YOUR COMMAND #>
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Options:
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-h : Get usage information of $program_name
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-V : Output more information for debug
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";
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#------------------------------------
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# Please implement the main checking job of current command in do_main_job function
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# If $outputtarget has input value, that means do_main_job is running on MN, so every message needed to print on STDOUT should be written into pipe $outputtarget.
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# If $outputtarget has no value, that means do_main_job is running on SN, all message just need to print on STDOUT
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# Recommand to use probe_utils->send_msg() to handle message you plan to print out
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# A simple example has been written in funciton.
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#------------------------------------
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sub do_main_job {
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my $outputtarget = shift;
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$outputtarget = "stdout" if (!$outputtarget);
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my $rst = 0;
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probe_utils->send_msg($outputtarget, "o", "I reveive node range is $noderange");
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#<#DO YOUR OWN CHECKING JOB1#>
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probe_utils->send_msg($outputtarget, "o", "first checking point");
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#<#DO YOUR OWN CHECKING JOB2#>
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probe_utils->send_msg($outputtarget, "f", "second checking point");
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return $rst;
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}
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#-------------------------------------
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# When this command return from all SNs and MN, you need to generate a summary
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# All history outpout from SNs and MN are saved in globle hash %summaryoutput.
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# $summaryoutput{mn} = @mnhistory
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# $summaryoutput{snname1} = @snname1history;
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# The entry in each histroy array isn't categorized, the message coming early is arranged before the one coming later.
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# A simple example of how to dump %summaryoutput has been written in function
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#-------------------------------------
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sub summary_all_jobs_output {
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my $rst = 0;
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#DO SUMMARY DEPENDING ON YOUR SUB_COMMAND NEED
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probe_utils->send_msg("$output", "d", "======================do summary=====================");
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foreach my $sn (keys %summaryoutput) {
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probe_utils->send_msg("$output", "d", "[$sn]");
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foreach my $log (@{ $summaryoutput{$sn} }) {
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probe_utils->send_msg("$output", "d", "$log");
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}
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}
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return $rst;
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}
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#-------------------------------------
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# Each probe sub command is supposed to support hierarchical.
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# This funtion is used to calclulate which SN should be dispatched which command
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#-------------------------------------
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sub calculate_dispatch_cmd {
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my @snlist = xCAT::ServiceNodeUtils->getAllSN();
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if ($noderange) {
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my @nodes = `nodels $noderange 2>&1`;
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#if there is error in noderange
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if ($?) {
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my $error = join(" ", @nodes);
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if ($error =~ /Error: Invalid nodes and\/or groups in noderange: (.+)/) {
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probe_utils->send_msg("$output", "f", "There are invaild nodes ($1) in command line attribute node range");
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} else {
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probe_utils->send_msg("$output", "f", "There is error in command line attribute node range, please using nodels to check");
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}
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return 1;
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} else {
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#calculate the mapping between SN and the nodes which belong to it.
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chomp foreach (@nodes);
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my $snnodemap = xCAT::ServiceNodeUtils->get_ServiceNode(\@nodes, "xcat", "MN");
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#print Dumper $snnodemap;
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my %newsnnodemap;
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foreach my $sn (keys %$snnodemap) {
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if (grep(/^$sn$/, @snlist)) { # the node just belong to one SN
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push(@{ $newsnnodemap{$sn} }, @{ $snnodemap->{$sn} });
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} elsif ($sn =~ /(\w+),.+/) { # the node belong to more than one SN, count it into first SN
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if(grep(/^$1$/, @snlist)){
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push(@{ $newsnnodemap{$1} }, @{ $snnodemap->{$sn} });
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}else{
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probe_utils->send_msg("$output", "f", "The value $1 of 'servicenode' isn't a service node");
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}
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} else { # the nodes don't belong to any SN will be handled by MN
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push(@{ $newsnnodemap{mn} }, @{ $snnodemap->{$sn} });
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}
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}
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#print Dumper \%newsnnodemap;
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#generate new command for each SN, replace noderange
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foreach my $sn (keys %newsnnodemap) {
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my $nodes = join(",", @{ $newsnnodemap{$sn} });
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if ($sn eq "mn") {
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$noderange = $nodes;
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} else {
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for (my $i = 0 ; $i <= $#tmpargv ; $i++) {
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if ($tmpargv[$i] eq "-n") {
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$tmpargv[ $i + 1 ] = $nodes;
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last;
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}
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}
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my $args = join(" ", @tmpargv);
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$dispatchcmd{$sn} = "$::XCATROOT/probe/subcmds/$program_name $args 2>&1";
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}
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}
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}
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} else {
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#there isn't noderange input from STDIN, dispatch command to all SN if there are SN defined in MN
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if (@snlist) {
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my $args = join(" ", @tmpargv);
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my $sns = join(",", @snlist);
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$dispatchcmd{$sns} = "$::XCATROOT/probe/subcmds/$program_name $args 2>&1" if (!$?);
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}
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}
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return 0;
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}
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#-------------------------------------
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# main process start
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#-------------------------------------
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@tmpargv = @ARGV;
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if (
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!GetOptions("--help|h" => \$help,
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"T" => \$test,
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"n=s" => \$noderange,
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"V" => \$verbose))
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{
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probe_utils->send_msg("$output", "f", "Invalid parameter for $program_name");
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probe_utils->send_msg("$output", "d", "$::USAGE");
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exit 1;
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}
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if ($help) {
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if ($output ne "stdout") {
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probe_utils->send_msg("$output", "d", "$::USAGE");
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} else {
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print "$::USAGE";
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}
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exit 0;
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}
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if ($test) {
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probe_utils->send_msg("$output", "o", "This isn't a probe tool, this is just a template for sub command coding. Using it to develop sub command which need to cover hierarchical cluster");
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exit 0;
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}
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#Handle the interrupt signal from STDIN
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$SIG{TERM} = $SIG{INT} = sub {
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$terminal = 1;
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};
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#--------------------------------------------
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# To confirm what current node is, MN or SN
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#--------------------------------------------
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$is_sn = 1 if (-e "/etc/xCATSN");
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#if this node is SN, just run job, not to do dispatch
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if ($is_sn) {
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$rst = do_main_job();
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exit $rst;
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}
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#--------------------------------------------
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# calculate which command should be dispatched to which SN
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#--------------------------------------------
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$rst = calculate_dispatch_cmd();
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#print Dumper \%dispatchcmd;
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#print "nodes left to mn : $noderange\n";
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#print "========================\n";
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exit $rst if ($rst);
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#--------------------------------------------
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# dispatch job to MN and SN
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#--------------------------------------------
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my $mnjobpid = 0;
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my @snsjobpids = ();
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my @snsjobfds = ();
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my $pipe_parent_read;
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my $pipe_child_write;
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pipe $pipe_parent_read, $pipe_child_write;
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{
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#handle job in MN
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$mnjobpid = fork();
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if (!defined($mnjobpid)) {
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probe_utils->send_msg("$output", "f", "fork process to handle MN job failed: $!");
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$rst = 1;
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last;
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} elsif ($mnjobpid == 0) {
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$SIG{TERM} = $SIG{INT} = sub {
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exit 1;
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};
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close $pipe_parent_read;
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$rst = do_main_job($pipe_child_write);
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exit $rst;
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}
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$SIG{CHLD} = sub { waitpid($mnjobpid, WNOHANG) };
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close $pipe_child_write;
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#handle job dispatch to SN
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foreach my $sn (keys %dispatchcmd) {
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my $snjobcmd = "xdsh $sn -s \"$dispatchcmd{$sn}\" 2>&1";
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#print "$sn = $snjobcmd\n";
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my $snjobfd;
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my $snjobpid;
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if (!($snjobpid = open($snjobfd, "$snjobcmd |"))) {
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probe_utils->send_msg("$output", "f", "fork process to dispatch cmd $snjobcmd to $sn failed: $!");
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next;
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}
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push(@snsjobpids, $snjobpid);
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push(@snsjobfds, $snjobfd);
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}
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my $select = new IO::Select;
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$select->add(\*$pipe_parent_read) if ($pipe_parent_read);
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$select->add(\*$_) foreach (@snsjobfds);
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$| = 1;
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my $line;
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my %pipeisnonull;
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$pipeisnonull{mn} = 1;
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$pipeisnonull{$_} = 1 foreach (@snsjobfds);
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my $onepipeisnonull = 1;
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while ($onepipeisnonull) {
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if (@hdls = $select->can_read(0)) {
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foreach $hdl (@hdls) {
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if ($pipeisnonull{mn} && $hdl == \*$pipe_parent_read) {
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if (eof($pipe_parent_read)) {
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$pipeisnonull{mn} = 0;
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} else {
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chomp($line = <$pipe_parent_read>);
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print "$line\n";
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push @{ $summaryoutput{mn} }, $line;
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}
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} else {
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foreach my $fd (@snsjobfds) {
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if ($pipeisnonull{$fd} && $hdl == \*$fd) {
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if (eof($fd)) {
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$pipeisnonull{$fd} = 0;
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} else {
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chomp($line = <$fd>);
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if ($line =~ /(Error:)\s+(\w+)\s+(.+)/i) {
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push @{ $summaryoutput{$2} }, $line;
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#if need to print to STDIN in real time, can make below line available
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#print "[failed] :$2: $line\n";
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} elsif ($line =~ /^(\w+)\s*:\s(.*)/) {
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push @{ $summaryoutput{$1} }, $2;
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#if need to print to STDIN in real time, can make below lines available
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#$line = "$2:$1: $3" if ($line =~ /^(\w+)\s*:\s*(\[\w+\]\s*):\s*(.*)/);
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#print "$line\n";
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}
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}
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}
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}
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}
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}
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$onepipeisnonull = 0;
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$onepipeisnonull |= $pipeisnonull{$_} foreach (keys %pipeisnonull);
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}
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last if ($terminal);
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sleep 1;
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}
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}
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close($pipe_child_write) if ($pipe_child_write);
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close($pipe_parent_read) if ($pipe_parent_read);
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close($_) foreach (@snsjobfds);
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#start to clear up all sub processes
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my %runningpid;
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$runningpid{$mnjobpid} = 1 if ($mnjobpid);
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$runningpid{$_} = 1 foreach (@snsjobpids);
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my $existrunningpid = 0;
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$existrunningpid = 1 if (%runningpid);
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my $trytime = 0;
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while ($existrunningpid) {
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#send terminal signal to all running process at same time
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#try INT 5 up to 5 times
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if ($try < 5) {
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foreach my $pid (keys %runningpid) {
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kill 'INT', $pid if ($runningpid{$pid});
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}
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#try TERM 5 up to 5 times
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} elsif ($try < 10) {
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foreach my $pid (keys %runningpid) {
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kill 'TERM', $pid if ($runningpid{$pid});
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}
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#try KILL 1 time
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} else {
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foreach my $pid (keys %runningpid) {
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kill 'KILL', $pid if ($runningpid{$pid});
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}
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}
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++$try;
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sleep 1;
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#To check how many process exit, set the flag of exited process to 0
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foreach my $pid (keys %runningpid) {
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$runningpid{$pid} = 0 if (waitpid($pid, WNOHANG));
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}
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#To check if there are processes still running, if there are, try kill again in next loop
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$existrunningpid = 0;
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$existrunningpid |= $runningpid{$_} foreach (keys %runningpid);
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#just try 10 times, if still can't kill some process, give up
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if ($try > 10) {
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my $leftpid;
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foreach my $pid (keys %runningpid) {
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$leftpid .= "$pid " if ($runningpid{$pid});
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}
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print "Can't stop process $leftpid, please handle manually.\n";
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last;
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}
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}
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#-------------------------------------
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# summary all jobs output to display
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#-------------------------------------
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$rst = summary_all_jobs_output();
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exit $rst;
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