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package Plack::Handler::Message::Passing; |
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4088
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use Moose; |
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use AnyEvent; |
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use Message::Passing::Output::ZeroMQ; |
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use Message::Passing::Input::ZeroMQ; |
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use JSON qw/ encode_json decode_json /; |
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use Try::Tiny qw/ try catch /; |
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use Plack::Middleware::BufferedStreaming; |
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use namespace::autoclean; |
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11
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with 'Message::Passing::Role::Output'; |
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has app => ( |
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is => 'rw', |
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); |
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has [qw/ host port /] => ( |
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is => 'ro', |
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); |
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has output_to => ( |
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is => 'ro', |
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default => sub { {} }, |
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); |
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sub get_output_to { |
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my ($self, $address) = @_; |
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$self->output_to->{$address} ||= Message::Passing::Output::ZeroMQ->new( |
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connect => $address, |
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socket_type => 'PUB', |
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); |
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} |
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sub consume { |
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my ($self, $msg) = @_; |
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my $env = decode_json($msg); |
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my $errors; |
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open(my $error_fh, '>', \$errors) or die $!; |
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$env->{'psgi.errors'} = $error_fh; |
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my $input = delete($env->{'psgi.input'}) || ''; |
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open(my $input_fh, '<', \$input) or die $!; |
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$env->{'psgi.input'} = $input_fh; |
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my $clientid = $env->{'psgix.message.passing.clientid'}; |
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my $reply_to = $env->{'psgix.message.passing.returnaddress'}; |
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my $res; |
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try { $res = $self->app->($env) } |
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catch { |
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my $exception = "Caught exception: $_ - request aborted\n"; |
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$errors .= $exception; |
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my $html = qq{<html><head><title>Internal server error</title></head> |
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<body><h1>Internal Server Error</h1><pre>$exception</pre></body> |
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</html> |
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}; |
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$res = [ |
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500, |
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[ |
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'Content-Type' => 'text/html', |
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'Content-Length' => length($html), |
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], |
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[ $html ] |
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]; |
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}; |
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my $return_data = encode_json({ |
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clientid => $clientid, |
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response => $res, |
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errors => $errors, |
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}); |
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my $output_to = $self->get_output_to($reply_to); |
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$output_to->consume($return_data); |
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} |
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72
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sub run { |
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my ($self, $app) = @_; |
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my $buffered = Plack::Middleware::BufferedStreaming->wrap($app); |
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$self->app($buffered); |
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if (!$self->host) { |
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die "Please specify --host with the send_address passed to Plack::App::Message::Passing\n"; |
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} |
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if (!$self->port) { |
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die "Please specify --port with the send_address port passed to Plack::App::Message::Passing\n"; |
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} |
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my $connect_address = sprintf('tcp://%s:%s', $self->host, $self->port); |
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my $input = Message::Passing::Input::ZeroMQ->new( |
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connect => $connect_address, |
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85
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socket_type => 'PULL', |
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output_to => $self, |
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); |
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AnyEvent->condvar->recv; |
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} |
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91
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__PACKAGE__->meta->make_immutable; |
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1; |
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93
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94
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=head1 NAME |
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96
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Plack::Handler::Message::Passing - handles PSGI requests sent via Message::Passing |
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98
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=head1 SYNOPSIS |
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99
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100
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plackup -E production -s Message::Passing testapp.psgi --host 127.0.0.1 --port 5556 |
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101
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102
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=head1 DESCRIPTION |
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Connects via ZeroMQ to an instance of L<Plack::App::Message::Passing>, and |
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inflates a PSGI request from JSON, then runs it against a real application. |
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107
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Returns the PSGI response and error stream to the parent handler |
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108
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109
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=head1 SEE ALSO |
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111
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=over |
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112
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113
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=item L<Message::Passing::PSGI> |
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114
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115
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=item L<Plack::App::Message::Passing> |
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117
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=back |
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119
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=head1 AUTHOR, COPYRIGHT AND LICENSE |
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121
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See L<Message::Passing::PSGI> |
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123
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=cut |
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