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1 | package Object::Remote::Role::Connector::PerlInterpreter; |
2 | |
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3 | use IPC::Open2; |
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4 | use IPC::Open3; |
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5 | use IO::Handle; |
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6 | use Object::Remote::ModuleSender; |
7 | use Object::Remote::Handle; |
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8 | use Object::Remote::Future; |
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9 | use Object::Remote::Logging qw( :log :dlog ); |
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10 | use Scalar::Util qw(blessed); |
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11 | use POSIX ":sys_wait_h"; |
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12 | use Moo::Role; |
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13 | use Symbol; |
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14 | |
15 | with 'Object::Remote::Role::Connector'; |
16 | |
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17 | #TODO ugh breaks some of the stuff in System::Introspector::Util by |
18 | #screwing with status value of child |
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19 | BEGIN { |
20 | $SIG{CHLD} = sub { |
21 | my $kid; |
22 | do { |
23 | $kid = waitpid(-1, WNOHANG); |
24 | } while $kid > 0; |
25 | } |
26 | } |
27 | |
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28 | has module_sender => (is => 'lazy'); |
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29 | #if no child_stderr file handle is specified then stderr |
30 | #of the child will be connected to stderr of the parent |
31 | has stderr => ( is => 'rw', default => sub { \*STDERR } ); |
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32 | #has stderr => ( is => 'rw' ); |
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33 | |
34 | sub _build_module_sender { |
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35 | my ($hook) = |
36 | grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') } |
37 | @INC; |
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38 | return $hook ? $hook->sender : Object::Remote::ModuleSender->new; |
39 | } |
40 | |
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41 | has perl_command => (is => 'lazy'); |
42 | |
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43 | #TODO convert nice value into optional feature enabled by |
44 | #setting value of attribute |
45 | #ulimit of ~500 megs of v-ram |
46 | #TODO only works with ssh with quotes but only works locally |
47 | #with out quotes |
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48 | sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 200000; nice -n 15 perl -"' ] } |
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49 | #sub _build_perl_command { [ 'perl', '-' ] } |
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50 | |
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51 | around connect => sub { |
52 | my ($orig, $self) = (shift, shift); |
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53 | my $f = $self->$start::start($orig => @_); |
54 | return future { |
55 | $f->on_done(sub { |
56 | my ($conn) = $f->get; |
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57 | my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding'); |
58 | $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router); |
fbd3b8ec |
59 | Object::Remote::Handle->new( |
60 | connection => $conn, |
61 | class => 'Object::Remote::ModuleLoader', |
62 | args => { module_sender => $self->module_sender } |
63 | )->disarm_free; |
64 | require Object::Remote::Prompt; |
65 | Object::Remote::Prompt::maybe_set_prompt_command_on($conn); |
66 | }); |
67 | $f; |
68 | } 2; |
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69 | }; |
70 | |
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71 | sub final_perl_command { shift->perl_command } |
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72 | |
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73 | sub _start_perl { |
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74 | my $self = shift; |
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75 | my $given_stderr = $self->stderr; |
76 | my $foreign_stderr; |
77 | |
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78 | Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command}; |
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79 | |
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80 | if (defined($given_stderr)) { |
81 | $foreign_stderr = gensym(); |
82 | } else { |
83 | $foreign_stderr = ">&STDERR"; |
84 | } |
85 | |
86 | my $pid = open3( |
87 | my $foreign_stdin, |
88 | my $foreign_stdout, |
89 | $foreign_stderr, |
90 | @{$self->final_perl_command}, |
91 | ) or die "Failed to run perl at '$_[0]': $!"; |
92 | |
93 | if (defined($given_stderr)) { |
94 | log_warn { "using experimental cat for child stderr" }; |
95 | |
96 | #TODO refactor if this solves the problem |
97 | Object::Remote->current_loop |
98 | ->watch_io( |
99 | handle => $foreign_stderr, |
100 | on_read_ready => sub { |
101 | my $buf = ''; |
102 | my $len = sysread($foreign_stderr, $buf, 32768); |
103 | if (!defined($len) or $len == 0) { |
104 | log_trace { "Got EOF or error on child stderr, removing from watcher" }; |
105 | $self->stderr(undef); |
106 | Object::Remote->current_loop |
107 | ->unwatch_io( |
108 | handle => $foreign_stderr, |
109 | on_read_ready => 1 |
110 | ); |
111 | } else { |
112 | Dlog_trace { "got $len characters of stderr data for connection" }; |
113 | print $given_stderr $buf or die "could not send stderr data: $!"; |
114 | } |
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115 | } |
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116 | ); |
117 | } |
118 | |
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119 | #TODO open2() dupes the child stderr into the calling |
120 | #process stderr which means if this process exits the |
121 | #child is still attached to the shell - using open3() |
122 | #and having the run loop manage the stderr means this |
123 | #won't happen BUT if the run loop just sends the remote |
124 | #stderr data to the local stderr the logs will interleave |
125 | #for sure - a simple test would be to use open3() and just |
126 | #close the remote stderr and see what happens - a longer |
127 | #term solution would be for Object::Remote to offer a feature |
128 | #where the user of a connection species a destination for output |
129 | #either a file name or their own file handle and the node output |
130 | #is dumped to it |
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131 | # my $pid = open2( |
132 | # my $foreign_stdout, |
133 | # my $foreign_stdin, |
134 | # @{$self->final_perl_command}, |
135 | # ) or die "Failed to run perl at '$_[0]': $!"; |
7790ca36 |
136 | # |
137 | # Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ]; |
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138 | |
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139 | |
140 | return ($foreign_stdin, $foreign_stdout, $pid); |
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141 | } |
142 | |
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143 | #TODO open2() forks off a child and I have not been able to locate |
144 | #a mechanism for reaping dead children so they don't become zombies |
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145 | #CONFIRMED there is no reaping of children being done, find a safe |
146 | #way to do it |
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147 | sub _open2_for { |
148 | my $self = shift; |
149 | my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_); |
fbd3b8ec |
150 | my $to_send = $self->fatnode_text; |
5d59cb98 |
151 | log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" }; |
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152 | Object::Remote->current_loop |
153 | ->watch_io( |
154 | handle => $foreign_stdin, |
155 | on_write_ready => sub { |
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156 | my $len = syswrite($foreign_stdin, $to_send, 32768); |
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157 | if (defined $len) { |
158 | substr($to_send, 0, $len) = ''; |
159 | } |
160 | # if the stdin went away, we'll never get Shere |
161 | # so it's not a big deal to simply give up on !defined |
162 | if (!defined($len) or 0 == length($to_send)) { |
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163 | log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" }; |
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164 | Object::Remote->current_loop |
165 | ->unwatch_io( |
166 | handle => $foreign_stdin, |
167 | on_write_ready => 1 |
168 | ); |
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169 | } else { |
170 | log_trace { "Sent $len bytes of fatnode data to remote side" }; |
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171 | } |
172 | } |
173 | ); |
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174 | return ($foreign_stdin, $foreign_stdout, $pid); |
175 | } |
176 | |
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177 | sub fatnode_text { |
178 | my ($self) = @_; |
179 | require Object::Remote::FatNode; |
180 | my $text = ''; |
181 | $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n" |
182 | if $ENV{OBJECT_REMOTE_DEBUG}; |
183 | $text .= <<'END'; |
184 | $INC{'Object/Remote/FatNode.pm'} = __FILE__; |
185 | $Object::Remote::FatNode::DATA = <<'ENDFAT'; |
186 | END |
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187 | $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA }; |
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188 | $text .= "ENDFAT\n"; |
189 | $text .= <<'END'; |
190 | eval $Object::Remote::FatNode::DATA; |
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191 | die $@ if $@; |
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192 | END |
193 | $text .= "__END__\n"; |
194 | return $text; |
195 | } |
196 | |
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197 | 1; |