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=head1 NAME |
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AnyEvent::HTTP - simple but non-blocking HTTP/HTTPS client |
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=head1 SYNOPSIS |
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use AnyEvent::HTTP; |
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=head1 DESCRIPTION |
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This module is an L<AnyEvent> user, you need to make sure that you use and |
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run a supported event loop. |
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=head2 METHODS |
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|
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=over 4 |
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=cut |
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package AnyEvent::HTTP; |
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|
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use strict; |
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no warnings; |
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|
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use Carp; |
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|
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use AnyEvent (); |
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use AnyEvent::Util (); |
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use AnyEvent::Socket (); |
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use AnyEvent::Handle (); |
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|
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use base Exporter::; |
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|
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our $VERSION = '1.0'; |
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|
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our @EXPORT = qw(http_get http_request); |
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our $MAX_REDIRECTS = 10; |
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our $USERAGENT = "Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)"; |
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our $MAX_PERSISTENT = 8; |
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our $PERSISTENT_TIMEOUT = 15; |
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our $TIMEOUT = 60; |
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|
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# changing these is evil |
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our $MAX_PERSISTENT_PER_HOST = 2; |
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our $MAX_PER_HOST = 4; # not respected yet :( |
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|
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my %KA_COUNT; # number of open keep-alive connections per host |
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=item http_get $url, key => value..., $cb->($data, $headers) |
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Executes an HTTP-GET request. See the http_request function for details on |
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additional parameters. |
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=item http_request $method => $url, key => value..., $cb->($data, $headers) |
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Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL |
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must be an absolute http or https URL. |
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|
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Additional parameters are key-value pairs, and are fully optional. They |
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include: |
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=over 4 |
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|
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=item recurse => $boolean (default: true) |
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Whether to recurse requests or not, e.g. on redirects, authentication |
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retries and so on. |
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=item headers => hashref |
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The request headers to use. |
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=item timeout => $seconds |
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The time-out to use for various stages - each connect attempt will reset |
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the timeout, as will read or write activity. |
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=back |
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=back |
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|
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=cut |
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sub http_request($$$;@) { |
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my $cb = pop; |
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my ($method, $url, %arg) = @_; |
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my %hdr; |
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if (my $hdr = delete $arg{headers}) { |
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while (my ($k, $v) = each %$hdr) { |
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$hdr{lc $k} = $v; |
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} |
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} |
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my $timeout = $arg{timeout} || $TIMEOUT; |
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$hdr{"user-agent"} ||= $USERAGENT; |
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my ($scheme, $authority, $path, $query, $fragment) = |
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$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|; |
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|
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$scheme = lc $scheme; |
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my $port = $scheme eq "http" ? 80 |
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: $scheme eq "https" ? 443 |
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: croak "$url: only http and https URLs supported"; |
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$authority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x |
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or croak "$authority: unparsable URL"; |
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my $host = $1; |
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$port = $2 if defined $2; |
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$host =~ s/^\[(.*)\]$/$1/; |
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$path .= "?$query" if length $query; |
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$hdr{host} = $host = lc $host; |
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my %state; |
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my $body = ""; |
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$state{body} = $body; |
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$hdr{"content-length"} = length $body; |
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$state{connect_guard} = AnyEvent::Socket::tcp_connect $host, $port, sub { |
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$state{fh} = shift |
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or return $cb->(undef, { Status => 599, Reason => "$!" }); |
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delete $state{connect_guard}; # reduce memory usage, save a tree |
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# get handle |
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$state{handle} = new AnyEvent::Handle |
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fh => $state{fh}, |
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($scheme eq "https" ? (tls => "connect") : ()); |
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# limit the number of persistent connections |
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if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) { |
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++$KA_COUNT{$_[1]}; |
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$state{handle}{ka_count_guard} = AnyEvent::Util::guard { --$KA_COUNT{$_[1]} }; |
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$hdr{connection} = "keep-alive"; |
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} else { |
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delete $hdr{connection}; |
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} |
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# (re-)configure handle |
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$state{handle}->timeout ($timeout); |
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$state{handle}->on_error (sub { |
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%state = (); |
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$cb->(undef, { Status => 599, Reason => "$!" }); |
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}); |
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$state{handle}->on_eof (sub { |
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%state = (); |
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$cb->(undef, { Status => 599, Reason => "unexpected end-of-file" }); |
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}); |
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# send request |
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$state{handle}->push_write ( |
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"\U$method\E $path HTTP/1.0\015\012" |
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. (join "", map "$_: $hdr{$_}\015\012", keys %hdr) |
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. "\015\012" |
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. (delete $state{body}) |
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); |
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%hdr = (); # reduce memory usage, save a kitten |
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# status line |
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$state{handle}->push_read (line => qr/\015?\012/, sub { |
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$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) \s+ ([^\015\012]+)/ix |
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or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid server response ($_[1])" })); |
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my %hdr = ( # response headers |
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HTTPVersion => ",$1", |
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Status => ",$2", |
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Reason => ",$3", |
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); |
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# headers, could be optimized a bit |
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$state{handle}->unshift_read (line => qr/\015?\012\015?\012/, sub { |
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for ("$_[1]\012") { |
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$hdr{lc $1} .= ",$2" |
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while /\G |
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([^:\000-\040]+): |
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[\011\040]* |
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((?: [^\015\012]+ | \015?\012[\011\040] )*) |
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\015?\012 |
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/gxc; |
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/\G$/ |
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or return $cb->(undef, { Status => 599, Reason => "garbled response headers" }); |
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} |
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substr $_, 0, 1, "" |
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for values %hdr; |
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if (exists $hdr{"content-length"}) { |
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$_[0]->unshift_read (chunk => $hdr{"content-length"}, sub { |
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# could cache persistent connection now |
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if ($hdr{connection} =~ /\bkeep-alive\b/i) { |
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}; |
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%state = (); |
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$cb->($_[1], \%hdr); |
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}); |
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} else { |
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# too bad, need to read until we get an error or EOF, |
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# no way to detect winged data. |
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$_[0]->on_error (sub { |
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%state = (); |
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$cb->($_[0]{rbuf}, \%hdr); |
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}); |
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$_[0]->on_eof (undef); |
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$_[0]->on_read (sub { }); |
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} |
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}); |
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}); |
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}, sub { |
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$timeout |
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}; |
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defined wantarray && AnyEvent::Util::guard { %state = () } |
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} |
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sub http_get($$;@) { |
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unshift @_, "GET"; |
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&http_request |
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} |
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|
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=head2 GLOBAL VARIABLES |
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|
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=over 4 |
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|
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=item $AnyEvent::HTTP::MAX_REDIRECTS |
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The default value for the C<max_redirects> request parameter |
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(default: C<10>). |
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=item $AnyEvent::HTTP::USERAGENT |
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The default value for the C<User-Agent> header (the default is |
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C<Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>). |
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=item $AnyEvent::HTTP::MAX_PERSISTENT |
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The maximum number of persistent connections to keep open (default: 8). |
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=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT |
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The maximum time to cache a persistent connection, in seconds (default: 15). |
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=back |
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=cut |
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=head1 SEE ALSO |
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|
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L<AnyEvent>. |
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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1 |
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