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=head1 NAME |
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AnyEvent::MCP::Server::JSONL - MCP over a newline-delimited byte stream |
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=head1 DESCRIPTION |
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A subclass of L<AnyEvent::MCP::Server> for sockets or other streaming handles. |
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Each incoming line is one UTF-8 JSON-RPC message. Replies are written as they |
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complete, without imposing request order. |
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=head1 METHODS |
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=head2 $handle = $server->accept ($fh, $fh_out) |
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Starts handling C<$fh>. If C<$fh_out> is supplied, it receives outgoing |
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messages; otherwise C<$fh> is used in both directions. Both handles belong |
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to the server until the connection closes. |
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With separate input/output handles, input EOF waits for pending replies |
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and drains the output before closing. EOF on a bidirectional socket closes |
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it immediately and cancels outstanding requests. |
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C<max_size> limits a buffered incoming message, defaulting to 1 MiB. |
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=head2 $server->close |
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Closes the server's connections and cancels outstanding requests. |
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=head1 EVENTS |
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=head2 on_connection_error => $callback->($server, $handle, $message) |
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Called for stream errors before closing the connection. |
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=head2 on_connection_close => $callback->($server, $handle) |
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Called after a connection has closed. |
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=head2 on_close => $callback->($server) |
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Called by C<close> after closing all connections. |
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=cut |
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package AnyEvent::MCP::Server::JSONL; |
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use common::sense; |
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use parent "AnyEvent::MCP::Server"; |
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use AnyEvent::Handle (); |
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use Scalar::Util qw(weaken); |
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sub accept { |
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my ($self, $fh, $fh_out) = @_; |
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delete $self->{_closed}; |
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weaken $self; |
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my $handle = AnyEvent::Handle->new ( |
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fh => $fh, |
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rbuf_max => $self->{max_size} || 1024 * 1024, |
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on_read => sub { $self->_read ($_[0]) if $self }, |
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on_error => sub { |
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my ($handle, $fatal, $message) = @_; |
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$self->event (connection_error => $handle, $message) if $self; |
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$self->_close ($handle) if $self; |
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}, |
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on_eof => sub { |
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return unless $self; |
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my ($handle) = @_; |
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if ($handle->{mcp_out}) { |
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$handle->{mcp_eof} = 1; |
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$self->_drain ($handle); |
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} else { |
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$self->_close ($handle); |
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} |
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}, |
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); |
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if ($fh_out) { |
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$handle->{mcp_out} = AnyEvent::Handle->new ( |
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fh => $fh_out, |
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on_error => sub { |
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$self->event (connection_error => $_[0], $_[2]) if $self; |
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$self->close if $self; |
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}, |
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); |
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} |
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$handle->{mcp_peer} = {}; |
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$self->{connections}{$handle} = $handle; |
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$handle |
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} |
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sub _read { |
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my ($self, $handle) = @_; |
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weaken $self; |
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$handle->push_read (line => sub { |
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my ($handle, $line) = @_; |
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return unless $self; |
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++$handle->{mcp_active}; |
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$self->json_rpc ($line, sub { |
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--$handle->{mcp_active}; |
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return if $handle->{mcp_closed}; |
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($handle->{mcp_out} || $handle)->push_write ($_[0] . "\n") |
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if defined $_[0]; |
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$self->_drain ($handle) if $handle->{mcp_eof}; |
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}, |
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peer => $handle->{mcp_peer}, |
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on_notify => sub { |
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return if $handle->{mcp_closed}; |
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($handle->{mcp_out} || $handle)->push_write (JSON::XS::encode_json ($_[1]) . "\n"); |
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}, |
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); |
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}); |
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} |
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sub _drain { |
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my ($self, $handle) = @_; |
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return if $handle->{mcp_active} || $handle->{mcp_closed}; |
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my $output = $handle->{mcp_out}; |
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if (length $output->{wbuf}) { |
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weaken $self; |
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$output->on_drain (sub { $self->_close ($handle) if $self }); |
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} else { |
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$self->_close ($handle); |
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} |
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} |
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sub _close { |
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my ($self, $handle) = @_; |
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return if $handle->{mcp_closed}; |
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$handle->{mcp_closed} = 1; |
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my $requests = delete $handle->{mcp_peer}{requests} || {}; |
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$_->cancel ("Connection closed") for grep defined, values %$requests; |
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delete $self->{connections}{$handle}; |
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$handle->{mcp_out}->destroy if $handle->{mcp_out}; |
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$handle->destroy; |
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$self->event (connection_close => $handle); |
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} |
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sub close { |
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my ($self) = @_; |
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return if $self->{_closed}++; |
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delete $self->{listener}; |
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$self->_close ($_) for values %{$self->{connections} || {}}; |
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$self->event (close =>); |
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} |
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sub DESTROY { |
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$_[0]->close |
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} |
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1 |
