mirror of
git://git.proxmox.com/git/qemu-server.git
synced 2025-02-02 09:47:13 +03:00
329 lines
7.2 KiB
Perl
Executable File
329 lines
7.2 KiB
Perl
Executable File
package PVE::QMPClient;
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use strict;
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use PVE::QemuServer;
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use IO::Multiplex;
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use POSIX qw(EINTR EAGAIN);
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use JSON;
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use Time::HiRes qw(usleep gettimeofday tv_interval);
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use Scalar::Util qw(weaken);
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use PVE::IPCC;
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use Data::Dumper;
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# Qemu Monitor Protocol (QMP) client.
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#
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# This implementation uses IO::Multiplex (libio-multiplex-perl) and
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# allows you to issue qmp commands to different VMs in parallel.
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# Note: kvm can onyl handle 1 connection, so we close connections asap
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sub new {
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my ($class, $eventcb) = @_;
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my $mux = new IO::Multiplex;
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my $self = bless {
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mux => $mux,
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fhs => {}, # $vmid => fh
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fhs_lookup => {}, # $fh => $vmid
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queue => {},
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current => {},
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errors => {},
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}, $class;
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$self->{eventcb} = $eventcb if $eventcb;
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$mux->set_callback_object($self);
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# make sure perl doesn't believe this is a circular reference as we
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# delete mux in DESTROY
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weaken($mux->{_object});
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return $self;
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}
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# add a single command to the queue for later execution
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# with queue_execute()
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sub queue_cmd {
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my ($self, $vmid, $callback, $execute, %params) = @_;
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my $cmd = {};
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$cmd->{execute} = $execute;
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$cmd->{arguments} = \%params;
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$cmd->{callback} = $callback;
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push @{$self->{queue}->{$vmid}}, $cmd;
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}
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# execute a single command
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sub cmd {
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my ($self, $vmid, $cmd, $timeout) = @_;
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my $result;
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my $callback = sub {
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my ($vmid, $resp) = @_;
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$result = $resp->{'return'};
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};
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die "no command specified" if !($cmd && $cmd->{execute});
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$cmd->{callback} = $callback;
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$cmd->{arguments} = {} if !defined($cmd->{arguments});
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$self->{queue}->{$vmid} = [ $cmd ];
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if (!$timeout) {
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# hack: monitor sometime blocks
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if ($cmd->{execute} eq 'query-migrate') {
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$timeout = 60*60; # 1 hour
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} elsif ($cmd->{execute} =~ m/^(eject|change)/) {
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$timeout = 60; # note: cdrom mount command is slow
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} elsif ($cmd->{execute} eq 'savevm-start' ||
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$cmd->{execute} eq 'savevm-end' ||
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$cmd->{execute} eq 'query-backup' ||
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$cmd->{execute} eq 'backup-cancel' ||
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$cmd->{execute} eq 'query-savevm' ||
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$cmd->{execute} eq 'delete-drive-snapshot' ||
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$cmd->{execute} eq 'snapshot-drive' ) {
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$timeout = 10*60; # 10 mins ?
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} else {
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$timeout = 3; # default
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}
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}
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$self->queue_execute($timeout);
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my $cmdstr = $cmd->{execute} || '';
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die "VM $vmid qmp command '$cmdstr' failed - $self->{errors}->{$vmid}"
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if defined($self->{errors}->{$vmid});
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return $result;
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};
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my $cmdid_seq = 0;
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my $next_cmdid = sub {
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$cmdid_seq++;
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return "$$:$cmdid_seq";
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};
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my $close_connection = sub {
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my ($self, $vmid) = @_;
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my $fh = $self->{fhs}->{$vmid};
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return if !$fh;
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delete $self->{fhs}->{$vmid};
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delete $self->{fhs_lookup}->{$fh};
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$self->{mux}->close($fh);
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};
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my $open_connection = sub {
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my ($self, $vmid, $timeout) = @_;
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my $sname = PVE::QemuServer::qmp_socket($vmid);
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$timeout = 1 if !$timeout;
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my $fh;
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my $starttime = [gettimeofday];
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my $count = 0;
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for (;;) {
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$count++;
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$fh = IO::Socket::UNIX->new(Peer => $sname, Blocking => 0, Timeout => 1);
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last if $fh;
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if ($! != EINTR && $! != EAGAIN) {
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die "unable to connect to VM $vmid socket - $!\n";
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}
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my $elapsed = tv_interval($starttime, [gettimeofday]);
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if ($elapsed >= $timeout) {
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die "unable to connect to VM $vmid socket - timeout after $count retries\n";
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}
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usleep(100000);
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}
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$self->{fhs}->{$vmid} = $fh;
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$self->{fhs_lookup}->{$fh} = $vmid;
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$self->{mux}->add($fh);
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return $fh;
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};
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my $check_queue = sub {
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my ($self) = @_;
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my $running = 0;
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foreach my $vmid (keys %{$self->{queue}}) {
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my $fh = $self->{fhs}->{$vmid};
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next if !$fh;
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if ($self->{errors}->{$vmid}) {
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&$close_connection($self, $vmid);
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next;
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}
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if ($self->{current}->{$vmid}) { # command running, waiting for response
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$running++;
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next;
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}
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if (!scalar(@{$self->{queue}->{$vmid}})) { # no more commands for the VM
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&$close_connection($self, $vmid);
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next;
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}
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eval {
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my $cmd = $self->{current}->{$vmid} = shift @{$self->{queue}->{$vmid}};
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$cmd->{id} = &$next_cmdid();
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my $fd = -1;
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if ($cmd->{execute} eq 'add-fd' || $cmd->{execute} eq 'getfd') {
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$fd = $cmd->{arguments}->{fd};
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delete $cmd->{arguments}->{fd};
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}
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my $qmpcmd = to_json({
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execute => $cmd->{execute},
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arguments => $cmd->{arguments},
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id => $cmd->{id}});
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if ($fd >= 0) {
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my $ret = PVE::IPCC::sendfd(fileno($fh), $fd, $qmpcmd);
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die "sendfd failed" if $ret < 0;
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} else {
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$self->{mux}->write($fh, $qmpcmd);
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}
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};
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if (my $err = $@) {
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$self->{errors}->{$vmid} = $err;
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} else {
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$running++;
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}
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}
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$self->{mux}->endloop() if !$running;
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return $running;
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};
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# execute all queued command
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sub queue_execute {
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my ($self, $timeout) = @_;
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$timeout = 3 if !$timeout;
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$self->{current} = {};
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$self->{errors} = {};
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# open all necessary connections
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foreach my $vmid (keys %{$self->{queue}}) {
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next if !scalar(@{$self->{queue}->{$vmid}}); # no commands for the VM
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eval {
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my $fh = &$open_connection($self, $vmid, $timeout);
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my $cmd = { execute => 'qmp_capabilities', arguments => {} };
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unshift @{$self->{queue}->{$vmid}}, $cmd;
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$self->{mux}->set_timeout($fh, $timeout);
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};
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if (my $err = $@) {
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warn $err;
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$self->{errors}->{$vmid} = $err;
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}
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}
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my $running;
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for (;;) {
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$running = &$check_queue($self);
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last if !$running;
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$self->{mux}->loop;
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}
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# make sure we close everything
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foreach my $vmid (keys %{$self->{fhs}}) {
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&$close_connection($self, $vmid);
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}
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$self->{queue} = $self->{current} = $self->{fhs} = $self->{fhs_lookup} = {};
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}
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# mux_input is called when input is available on one of
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# the descriptors.
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sub mux_input {
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my ($self, $mux, $fh, $input) = @_;
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return if $$input !~ s/^(.*})\r\n(.*)$/$2/so;
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my $raw = $1;
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my $vmid = $self->{fhs_lookup}->{$fh};
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if (!$vmid) {
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warn "internal error - unable to lookup vmid";
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return;
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}
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eval {
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my @jsons = split("\n", $raw);
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foreach my $json (@jsons) {
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my $obj = from_json($json);
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next if defined($obj->{QMP}); # skip monitor greeting
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if (exists($obj->{error}->{desc})) {
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my $desc = $obj->{error}->{desc};
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chomp $desc;
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die "$desc\n" if $desc !~ m/Connection can not be completed immediately/;
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next;
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}
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if (defined($obj->{event})) {
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if (my $eventcb = $self->{eventcb}) {
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&$eventcb($obj);
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}
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next;
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}
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my $cmdid = $obj->{id};
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die "received responsed without command id\n" if !$cmdid;
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my $curcmd = $self->{current}->{$vmid};
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die "unable to lookup current command for VM $vmid\n" if !$curcmd;
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delete $self->{current}->{$vmid};
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if ($curcmd->{id} ne $cmdid) {
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die "got wrong command id '$cmdid' (expected $curcmd->{id})\n";
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}
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if (my $callback = $curcmd->{callback}) {
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&$callback($vmid, $obj);
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}
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}
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};
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if (my $err = $@) {
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$self->{errors}->{$vmid} = $err;
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}
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&$check_queue($self);
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}
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# This gets called every second to update player info, etc...
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sub mux_timeout {
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my ($self, $mux, $fh) = @_;
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if (my $vmid = $self->{fhs_lookup}->{$fh}) {
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$self->{errors}->{$vmid} = "got timeout\n";
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}
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&$check_queue($self);
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}
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1;
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