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27bfc7c6 DM |
1 | package PVE::RADOS; |
2 | ||
3 | use 5.014002; | |
4 | use strict; | |
5 | use warnings; | |
6 | use Carp; | |
7 | use JSON; | |
9539bd37 DM |
8 | use Socket; |
9 | ||
27bfc7c6 DM |
10 | require Exporter; |
11 | ||
12 | our @ISA = qw(Exporter); | |
13 | ||
14 | # Items to export into callers namespace by default. Note: do not export | |
15 | # names by default without a very good reason. Use EXPORT_OK instead. | |
16 | # Do not simply export all your public functions/methods/constants. | |
17 | ||
18 | # This allows declaration use PVE::RADOS ':all'; | |
19 | # If you do not need this, moving things directly into @EXPORT or @EXPORT_OK | |
20 | # will save memory. | |
21 | our %EXPORT_TAGS = ( 'all' => [ qw( | |
22 | ||
23 | ) ] ); | |
24 | ||
25 | our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } ); | |
26 | ||
27 | our @EXPORT = qw( | |
28 | ||
29 | ); | |
30 | ||
31 | our $VERSION = '1.0'; | |
32 | ||
33 | require XSLoader; | |
34 | XSLoader::load('PVE::RADOS', $VERSION); | |
35 | ||
9539bd37 DM |
36 | # fixme: timeouts?? |
37 | ||
38 | my $writedata = sub { | |
39 | my ($fh, $cmd, $data) = @_; | |
40 | ||
41 | local $SIG{PIPE} = 'IGNORE'; | |
42 | ||
43 | my $bin = pack "a L/a*", $cmd, $data || ''; | |
44 | my $res = syswrite $fh, $bin; | |
45 | ||
46 | die "write data failed - $!\n" if !defined($res); | |
47 | }; | |
612779b1 | 48 | |
9539bd37 DM |
49 | my $readdata = sub { |
50 | my ($fh, $expect_result) = @_; | |
27bfc7c6 | 51 | |
9539bd37 | 52 | my $head = ''; |
612779b1 | 53 | |
9539bd37 | 54 | local $SIG{PIPE} = 'IGNORE'; |
612779b1 | 55 | |
9539bd37 DM |
56 | while (length($head) < 5) { |
57 | last if !sysread $fh, $head, 5 - length($head), length($head); | |
612779b1 | 58 | } |
9539bd37 DM |
59 | die "partial read\n" if length($head) < 5; |
60 | ||
61 | my ($cmd, $len) = unpack "a L", $head; | |
612779b1 | 62 | |
9539bd37 DM |
63 | my $data = ''; |
64 | while (length($data) < $len) { | |
65 | last if !sysread $fh, $data, $len - length($data), length($data); | |
66 | } | |
67 | die "partial data read\n" if length($data) < $len; | |
68 | ||
69 | if ($expect_result) { | |
70 | die $data if $cmd eq 'E' && $data; | |
71 | die "got unexpected result\n" if $cmd ne '>'; | |
72 | } | |
27bfc7c6 | 73 | |
9539bd37 DM |
74 | return wantarray ? ($cmd, $data) : $data; |
75 | }; | |
76 | ||
77 | sub new { | |
78 | my ($class, %params) = @_; | |
79 | ||
80 | socketpair(my $child, my $parent, AF_UNIX, SOCK_STREAM, PF_UNSPEC) | |
81 | || die "socketpair: $!"; | |
82 | ||
83 | my $cpid = fork(); | |
84 | ||
85 | die "unable to fork - $!\n" if !defined($cpid); | |
86 | ||
87 | my $self = bless {}; | |
88 | ||
89 | if ($cpid) { # parent | |
90 | close $parent; | |
91 | ||
92 | $self->{cpid} = $cpid; | |
93 | $self->{child} = $child; | |
94 | ||
95 | # wait for sync | |
96 | my ($cmd, $msg) = &$readdata($child); | |
97 | die $msg if $cmd eq 'E'; | |
98 | die "internal error- got unexpected result" if $cmd ne 'S'; | |
99 | ||
100 | } else { # child | |
101 | $0 = 'pverados'; | |
102 | ||
103 | # fixme: timeout? | |
104 | ||
105 | close $child; | |
106 | ||
107 | my $timeout = delete $params{timeout} || 5; | |
108 | ||
109 | my $conn; | |
110 | eval { | |
111 | $conn = pve_rados_create() || | |
112 | die "unable to create RADOS object\n"; | |
113 | ||
114 | pve_rados_conf_set($conn, 'client_mount_timeout', $timeout); | |
115 | ||
116 | foreach my $k (keys %params) { | |
117 | pve_rados_conf_set($conn, $k, $params{$k}); | |
118 | } | |
119 | ||
120 | pve_rados_connect($conn); | |
121 | }; | |
122 | if (my $err = $@) { | |
123 | &$writedata($parent, 'E', $err); | |
124 | die $err; | |
125 | } | |
126 | &$writedata($parent, 'S'); | |
127 | ||
128 | $self->{conn} = $conn; | |
129 | ||
130 | for (;;) { | |
131 | my ($cmd, $data) = &$readdata($parent); | |
132 | ||
133 | last if $cmd eq 'Q'; | |
134 | ||
135 | my $res; | |
136 | eval { | |
137 | if ($cmd eq 'M') { # rados monitor commands | |
138 | $res = pve_rados_mon_command($self->{conn}, [ $data ]); | |
139 | } elsif ($cmd eq 'C') { # class methods | |
140 | my $aref = decode_json($data); | |
141 | my $method = shift @$aref; | |
142 | $res = encode_json($self->$method(@$aref)); | |
143 | } else { | |
144 | die "invalid command\n"; | |
145 | } | |
146 | }; | |
147 | if (my $err = $@) { | |
148 | &$writedata($parent, 'E', $err); | |
149 | die $err; | |
150 | } | |
151 | &$writedata($parent, '>', $res); | |
152 | } | |
153 | ||
154 | exit(0); | |
155 | } | |
27bfc7c6 DM |
156 | |
157 | return $self; | |
158 | } | |
159 | ||
160 | sub DESTROY { | |
161 | my ($self) = @_; | |
162 | ||
9539bd37 DM |
163 | if ($self->{cpid}) { |
164 | #print "$$: DESTROY WAIT0\n"; | |
165 | eval { &$writedata($self->{child}, 'Q'); }; | |
166 | my $res = waitpid($self->{cpid}, 0); | |
167 | #print "$$: DESTROY WAIT $res\n"; | |
168 | } else { | |
169 | #print "$$: DESTROY SHUTDOWN\n"; | |
170 | pve_rados_shutdown($self->{conn}) if $self->{conn}; | |
171 | } | |
27bfc7c6 DM |
172 | } |
173 | ||
174 | sub cluster_stat { | |
9539bd37 DM |
175 | my ($self, @args) = @_; |
176 | ||
177 | if ($self->{cpid}) { | |
178 | my $data = encode_json(['cluster_stat', @args]); | |
179 | &$writedata($self->{child}, 'C', $data); | |
180 | return decode_json(&$readdata($self->{child}, 1)); | |
181 | } else { | |
182 | return pve_rados_cluster_stat($self->{conn}); | |
183 | } | |
27bfc7c6 DM |
184 | } |
185 | ||
f5996c62 DM |
186 | # example1: { prefix => 'get_command_descriptions'}) |
187 | # example2: { prefix => 'mon dump', format => 'json' } | |
27bfc7c6 DM |
188 | sub mon_command { |
189 | my ($self, $cmd) = @_; | |
190 | ||
b2a25d5d DM |
191 | $cmd->{format} = 'json' if !$cmd->{format}; |
192 | ||
27bfc7c6 | 193 | my $json = encode_json($cmd); |
9539bd37 DM |
194 | |
195 | &$writedata($self->{child}, 'M', $json); | |
196 | ||
197 | my $raw = &$readdata($self->{child}, 1); | |
198 | ||
27bfc7c6 | 199 | if ($cmd->{format} && $cmd->{format} eq 'json') { |
23c2cb25 | 200 | return length($raw) ? decode_json($raw) : undef; |
27bfc7c6 DM |
201 | } |
202 | return $raw; | |
203 | } | |
204 | ||
205 | ||
206 | 1; | |
207 | __END__ | |
208 | ||
209 | =head1 NAME | |
210 | ||
211 | PVE::RADOS - Perl bindings for librados | |
212 | ||
213 | =head1 SYNOPSIS | |
214 | ||
215 | use PVE::RADOS; | |
216 | ||
217 | my $rados = PVE::RADOS::new(); | |
218 | my $stat = $rados->cluster_stat(); | |
219 | my $res = $rados->mon_command({ prefix => 'mon dump', format => 'json' }); | |
220 | ||
221 | =head1 DESCRIPTION | |
222 | ||
223 | Perl bindings for librados. | |
224 | ||
225 | =head2 EXPORT | |
226 | ||
227 | None by default. | |
228 | ||
229 | =head1 AUTHOR | |
230 | ||
231 | Dietmar Maurer, E<lt>dietmar@proxmox.com<gt> | |
232 | ||
233 | =cut |