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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 Moo::Role; |
12 | |
13 | with 'Object::Remote::Role::Connector'; |
14 | |
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15 | has module_sender => (is => 'lazy'); |
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16 | #if no child_stderr file handle is specified then stderr |
17 | #of the child will be connected to stderr of the parent |
18 | has stderr => ( is => 'rw', default => sub { \*STDERR } ); |
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19 | |
20 | sub _build_module_sender { |
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21 | my ($hook) = |
22 | grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') } |
23 | @INC; |
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24 | return $hook ? $hook->sender : Object::Remote::ModuleSender->new; |
25 | } |
26 | |
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27 | has perl_command => (is => 'lazy'); |
28 | |
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29 | #TODO convert nice value into optional feature enabled by |
30 | #setting value of attribute |
31 | #ulimit of ~500 megs of v-ram |
32 | #TODO only works with ssh with quotes but only works locally |
33 | #with out quotes |
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34 | #sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 80000; nice -n 15 perl -"' ] } |
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35 | sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 500000; nice -n 15 perl -"' ] } |
36 | #sub _build_perl_command { [ 'perl', '-' ] } |
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37 | |
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38 | around connect => sub { |
39 | my ($orig, $self) = (shift, shift); |
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40 | my $f = $self->$start::start($orig => @_); |
41 | return future { |
42 | $f->on_done(sub { |
43 | my ($conn) = $f->get; |
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44 | my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding'); |
45 | $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router); |
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46 | Object::Remote::Handle->new( |
47 | connection => $conn, |
48 | class => 'Object::Remote::ModuleLoader', |
49 | args => { module_sender => $self->module_sender } |
50 | )->disarm_free; |
51 | require Object::Remote::Prompt; |
52 | Object::Remote::Prompt::maybe_set_prompt_command_on($conn); |
53 | }); |
54 | $f; |
55 | } 2; |
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56 | }; |
57 | |
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58 | sub final_perl_command { shift->perl_command } |
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59 | |
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60 | sub _start_perl { |
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61 | my $self = shift; |
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62 | my $given_stderr = $self->stderr; |
63 | my $foreign_stderr; |
64 | |
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65 | Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command}; |
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66 | |
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67 | use Symbol; |
68 | |
69 | if (defined($given_stderr)) { |
70 | $foreign_stderr = gensym(); |
71 | } else { |
72 | $foreign_stderr = ">&STDERR"; |
73 | } |
74 | |
75 | my $pid = open3( |
76 | my $foreign_stdin, |
77 | my $foreign_stdout, |
78 | $foreign_stderr, |
79 | @{$self->final_perl_command}, |
80 | ) or die "Failed to run perl at '$_[0]': $!"; |
81 | |
82 | if (defined($given_stderr)) { |
83 | log_warn { "using experimental cat for child stderr" }; |
84 | |
85 | #TODO refactor if this solves the problem |
86 | Object::Remote->current_loop |
87 | ->watch_io( |
88 | handle => $foreign_stderr, |
89 | on_read_ready => sub { |
90 | my $buf = ''; |
91 | my $len = sysread($foreign_stderr, $buf, 32768); |
92 | if (!defined($len) or $len == 0) { |
93 | log_trace { "Got EOF or error on child stderr, removing from watcher" }; |
94 | $self->stderr(undef); |
95 | Object::Remote->current_loop |
96 | ->unwatch_io( |
97 | handle => $foreign_stderr, |
98 | on_read_ready => 1 |
99 | ); |
100 | } else { |
101 | Dlog_trace { "got $len characters of stderr data for connection" }; |
102 | print $given_stderr $buf or die "could not send stderr data: $!"; |
103 | } |
104 | } |
105 | ); |
106 | } |
107 | |
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108 | #TODO open2() dupes the child stderr into the calling |
109 | #process stderr which means if this process exits the |
110 | #child is still attached to the shell - using open3() |
111 | #and having the run loop manage the stderr means this |
112 | #won't happen BUT if the run loop just sends the remote |
113 | #stderr data to the local stderr the logs will interleave |
114 | #for sure - a simple test would be to use open3() and just |
115 | #close the remote stderr and see what happens - a longer |
116 | #term solution would be for Object::Remote to offer a feature |
117 | #where the user of a connection species a destination for output |
118 | #either a file name or their own file handle and the node output |
119 | #is dumped to it |
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120 | # my $pid = open2( |
121 | # my $foreign_stdout, |
122 | # my $foreign_stdin, |
123 | # @{$self->final_perl_command}, |
124 | # ) or die "Failed to run perl at '$_[0]': $!"; |
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125 | |
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126 | Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ]; |
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127 | return ($foreign_stdin, $foreign_stdout, $pid); |
128 | } |
129 | |
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130 | #TODO open2() forks off a child and I have not been able to locate |
131 | #a mechanism for reaping dead children so they don't become zombies |
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132 | #CONFIRMED there is no reaping of children being done, find a safe |
133 | #way to do it |
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134 | sub _open2_for { |
135 | my $self = shift; |
136 | my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_); |
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137 | my $to_send = $self->fatnode_text; |
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138 | log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" }; |
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139 | Object::Remote->current_loop |
140 | ->watch_io( |
141 | handle => $foreign_stdin, |
142 | on_write_ready => sub { |
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143 | my $len = syswrite($foreign_stdin, $to_send, 32768); |
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144 | if (defined $len) { |
145 | substr($to_send, 0, $len) = ''; |
146 | } |
147 | # if the stdin went away, we'll never get Shere |
148 | # so it's not a big deal to simply give up on !defined |
149 | if (!defined($len) or 0 == length($to_send)) { |
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150 | log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" }; |
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151 | Object::Remote->current_loop |
152 | ->unwatch_io( |
153 | handle => $foreign_stdin, |
154 | on_write_ready => 1 |
155 | ); |
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156 | } else { |
157 | log_trace { "Sent $len bytes of fatnode data to remote side" }; |
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158 | } |
159 | } |
160 | ); |
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161 | return ($foreign_stdin, $foreign_stdout, $pid); |
162 | } |
163 | |
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164 | sub fatnode_text { |
165 | my ($self) = @_; |
166 | require Object::Remote::FatNode; |
167 | my $text = ''; |
168 | $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n" |
169 | if $ENV{OBJECT_REMOTE_DEBUG}; |
170 | $text .= <<'END'; |
171 | $INC{'Object/Remote/FatNode.pm'} = __FILE__; |
172 | $Object::Remote::FatNode::DATA = <<'ENDFAT'; |
173 | END |
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174 | $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA }; |
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175 | $text .= "ENDFAT\n"; |
176 | $text .= <<'END'; |
177 | eval $Object::Remote::FatNode::DATA; |
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178 | die $@ if $@; |
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179 | END |
180 | $text .= "__END__\n"; |
181 | return $text; |
182 | } |
183 | |
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184 | 1; |