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lib/API/Docker/Role/HTTP.pm  view on Meta::CPAN

sub _reconnect {
  my ($self) = @_;
  $self->_clear_socket;
  return $self->_socket;
}

sub _request {
  my ($self, $method, $path, %opts) = @_;

  my $version = $self->api_version;
  my $url_path = defined $version ? "/v$version$path" : $path;

  my $body_content = '';
  my $content_type = 'application/json';
  if ($opts{raw_body}) {
    $body_content = $opts{raw_body};
    $content_type = $opts{content_type} // 'application/x-tar';
  }
  elsif ($opts{body}) {
    $body_content = encode_json($opts{body});
  }

  if ($opts{params}) {
    my @pairs;
    for my $k (sort keys %{$opts{params}}) {
      my $v = $opts{params}{$k};
      next unless defined $v;
      if (ref $v eq 'HASH') {
        $v = encode_json($v);
      }
      push @pairs, _uri_encode($k) . '=' . _uri_encode($v);
    }
    $url_path .= '?' . join('&', @pairs) if @pairs;
  }

  $log->debugf("%s %s", $method, $url_path);

  my $request = "$method $url_path HTTP/1.1\r\n";
  $request .= "Host: localhost\r\n";
  $request .= "Connection: close\r\n";
  $request .= "User-Agent: API-Docker\r\n";

  if ($body_content) {
    $request .= "Content-Type: $content_type\r\n";
    $request .= "Content-Length: " . length($body_content) . "\r\n";
  }

  if ($opts{headers}) {
    for my $h (sort keys %{$opts{headers}}) {
      my $v = $opts{headers}{$h};
      next unless defined $v;
      $v =~ s/[\r\n]//g;
      $request .= "$h: $v\r\n";
    }
  }

  $request .= "\r\n";
  $request .= $body_content if $body_content;

  my $sock = $self->_reconnect;
  print $sock $request;

  my $response = $self->_read_response($sock);
  close $sock;
  $self->_clear_socket;

  my ($status_code, $status_text, $headers, $body) = @$response;

  $log->debugf("Response: %s %s", $status_code, $status_text);

  if ($status_code >= 400) {
    my $error_msg = $body;
    if ($body && $body =~ /^\s*[\{\[]/) {
      eval {
        my $data = decode_json($body);
        $error_msg = $data->{message} // $body;
      };
    }
    croak "Docker API error ($status_code): $error_msg";
  }

  if ($status_code == 204 || !defined($body) || $body eq '') {
    return undef;
  }

  if ($body =~ /^\s*[\{\[]/) {
    my $result = eval { decode_json($body) };
    return $result if defined $result;

    # Streaming endpoints (e.g. /build, /images/create) return
    # newline-delimited JSON objects.  Parse each line separately.
    my @objects;
    for my $line (split /\r?\n/, $body) {
      next unless $line =~ /\S/;
      my $obj = eval { decode_json($line) };
      push @objects, $obj if defined $obj;
    }
    return \@objects if @objects;
  }

  return $body;
}

sub _read_response {
  my ($self, $sock) = @_;

  my $status_line = <$sock>;
  croak "No response from Docker daemon" unless defined $status_line;
  $status_line =~ s/\r?\n$//;

  my ($proto, $status_code, $status_text) = split /\s+/, $status_line, 3;

  my %headers;
  while (my $line = <$sock>) {
    $line =~ s/\r?\n$//;
    last if $line eq '';
    if ($line =~ /^([^:]+):\s*(.*)$/) {
      $headers{lc $1} = $2;
    }
  }

  my $body = '';
  if ($headers{'transfer-encoding'} && $headers{'transfer-encoding'} eq 'chunked') {
    $body = $self->_read_chunked($sock);
  }
  elsif (defined $headers{'content-length'}) {
    my $len = $headers{'content-length'};
    if ($len > 0) {
      my $read = 0;
      while ($read < $len) {
        my $buf;
        my $n = read($sock, $buf, $len - $read);
        last unless $n;
        $body .= $buf;
        $read += $n;
      }
    }
  }
  else {
    local $/;
    $body = <$sock> // '';
  }

  return [$status_code, $status_text, \%headers, $body];
}

sub _read_chunked {
  my ($self, $sock) = @_;
  my $body = '';

  while (1) {
    my $chunk_header = <$sock>;
    last unless defined $chunk_header;
    $chunk_header =~ s/\r?\n$//;
    my $chunk_size = hex($chunk_header);
    last if $chunk_size == 0;

    my $chunk = '';
    my $read = 0;
    while ($read < $chunk_size) {
      my $buf;
      my $n = read($sock, $buf, $chunk_size - $read);
      last unless $n;
      $chunk .= $buf;
      $read += $n;
    }
    $body .= $chunk;

    # Read trailing \r\n after chunk data
    <$sock>;
  }

  return $body;
}

sub _uri_encode {
  my ($str) = @_;
  $str =~ s/([^A-Za-z0-9\-_.~:\/])/sprintf("%%%02X", ord($1))/ge;
  return $str;
}

sub get {
  my ($self, $path, %opts) = @_;
  return $self->_request('GET', $path, %opts);
}


sub post {
  my ($self, $path, $body, %opts) = @_;
  $opts{body} = $body if defined $body;
  return $self->_request('POST', $path, %opts);
}


sub put {
  my ($self, $path, $body, %opts) = @_;
  $opts{body} = $body if defined $body;
  return $self->_request('PUT', $path, %opts);
}


sub delete_request {
  my ($self, $path, %opts) = @_;
  return $self->_request('DELETE', $path, %opts);
}



1;

__END__

=pod

=encoding UTF-8

=head1 NAME

API::Docker::Role::HTTP - HTTP transport role for Docker Engine API

=head1 VERSION

version 0.002

=head1 SYNOPSIS

    package MyDockerClient;
    use Moo;

    has host => (is => 'ro', required => 1);
    has api_version => (is => 'ro');

    with 'API::Docker::Role::HTTP';

    # Now use get, post, put, delete_request methods
    my $data = $self->get('/containers/json');

=head1 DESCRIPTION