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Manual Reference Pages  -  APACHE2::CONNECTION (3)

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NAME

Apache2::Connection - Perl API for Apache connection object

CONTENTS

Synopsis



  use Apache2::Connection ();
  use Apache2::RequestRec ();

  my $c = $r->connection;

  my $c = $r->connection;  
  # is connection still open?
  $status = $c->aborted;
 
  # base server
  $base_server = $c->base_server();
 
  # needed for creating buckets/brigades
  $ba = $c->bucket_alloc();
 
  # clients socket
  $socket = $c->client_socket;
 
  # unique connection id
  $id = $c->id();
 
  # connection filters stack
  $input_filters = $c->input_filters();
  $output_filters = $c->output_filters();
 
  # keep the connection alive?
  $status = $c->keepalive();
 
  # how many requests served over the current connection
  $served = $c->keepalives();
 
  # this connections local and remote socket addresses
  $local_sa  = $c->local_addr();
  $remote_sa = $c->remote_addr();
 
  # local and remote hostnames
  $local_host = $c->local_host();
  $remote_host = $c->get_remote_host();
  $remote_host = $c->remote_host();
 
  # server and remote clients IP addresses
  $local_ip = $c->local_ip();
  $remote_ip = $c->remote_ip();
 
  # connection level Apache notes
  $notes = $c->notes();
 
  # this connections pool
  $p = $c->pool();



Description

Apache2::RequestRec provides the Perl API for Apache connection record object.

API

Apache2::Connection provides the following functions and/or methods:

CWaborted

Check whether the connection is still open



  $status = $c->aborted();



obj: $c ( Apache2::Connection object )
ret: $status ( boolean ) true if the connection has been aborted, false if still open
since: 2.0.00

CWbase_server

Physical server this connection came in on (main server or vhost):



  $base_server = $c->base_server();



obj: $c ( Apache2::Connection object )
ret: $base_server ( Apache2::Server object )
since: 2.0.00

CWbucket_alloc

The bucket allocator to use for all bucket/brigade creations



  $ba = $c->bucket_alloc();



obj: $c ( Apache2::Connection object )
ret: $ba ( APR::BucketAlloc object )
since: 2.0.00
This object is needed by APR::Bucket and APR::Brigade methods/functions.

CWclient_socket

Get/set the client socket



  $socket      = $c->client_socket;
  $prev_socket = $c->client_socket($new_socket);



obj: $c ( Apache2::Connection object )
opt arg1: $new_socket ( APR::Socket object object ) If passed a new socket will be set.
ret: $socket ( APR::Socket object object ) current client socket

if the optional argument $new_socket was passed the previous socket object is returned.

since: 2.0.00

CWget_remote_host

Lookup the client’s DNS hostname or IP address



  $remote_host = $c->remote_host();
  $remote_host = $c->remote_host($type);
  $remote_host = $c->remote_host($type, $dir_config);



obj: $c ( Apache2::Connection object ) The current connection
opt arg1: $type ( :remotehost constant ) The type of lookup to perform:
Apache2::Const::REMOTE_DOUBLE_REV will always force a DNS lookup, and also force a double reverse lookup, regardless of the HostnameLookups setting. The result is the (double reverse checked) hostname, or undef if any of the lookups fail.
Apache2::Const::REMOTE_HOST returns the hostname, or undef if the hostname lookup fails. It will force a DNS lookup according to the HostnameLookups setting.
Apache2::Const::REMOTE_NAME returns the hostname, or the dotted quad if the hostname lookup fails. It will force a DNS lookup according to the HostnameLookups setting.
Apache2::Const::REMOTE_NOLOOKUP is like Apache2::Const::REMOTE_NAME except that a DNS lookup is never forced.

Default value is Apache2::Const::REMOTE_NAME.

opt arg2: $dir_config ( Apache2::ConfVector object ) The directory config vector from the request. It’s needed to find the container in which the directive HostnameLookups is set. To get one for the current request use $r->per_dir_config.

By default, undef is passed, in which case it’s the same as if HostnameLookups was set to Off.

ret: $remote_host ( string/undef ) The remote hostname. If the configuration directive <B>HostNameLookupsB> is set to off, this returns the dotted decimal representation of the client’s IP address instead. Might return undef if the hostname is not known.
since: 2.0.00
The result of get_remote_host call is cached in $c->remote_host. If the latter is set, get_remote_host will return that value immediately, w/o doing any checkups.

CWid

ID of this connection; unique at any point in time



  $id = $c->id();



obj: $c ( Apache2::Connection object )
ret: $id (integer)
since: 2.0.00

CWinput_filters

Get/set the first filter in a linked list of protocol level input filters:



  $input_filters      = $c->input_filters();
  $prev_input_filters = $c->input_filters($new_input_filters);



obj: $c ( Apache2::Connection object )
opt arg1: $new_input_filters Set a new value
ret: $input_filters ( Apache2::Filter object ) The first filter in the connection input filters chain.

If $new_input_filters was passed, returns the previous value.

since: 2.0.00
For an example see: Bucket Brigades-based Protocol Module

CWkeepalive

This method answers the question: Should the the connection be kept alive for another HTTP request after the current request is completed?



  $status = $c->keepalive();
  $status = $c->keepalive($new_status);



obj: $c ( Apache2::Connection object )
opt arg1: $new_status ( :conn_keepalive constant ) Normally you should not mess with setting this option when handling the HTTP protocol. If you do (for example when sending your own headers set with $r->assbackwards) — take a look at the ap_set_keepalive() function in httpd-2.0/modules/http/http_protocol.c.
ret: $status ( :conn_keepalive constant ) The method does <B>notB> return true or false, but one of the states which can be compared against (:conn_keepalive constants).
since: 2.0.00
Unless you set this value yourself when implementing non-HTTP protocols, it’s only relevant for HTTP requests.

For example:



  use Apache2::RequestRec ();
  use Apache2::Connection ();
 
  use Apache2::Const -compile => qw(:conn_keepalive);
  ...
  my $c = $r->connection;
  if ($c->keepalive == Apache2::Const::CONN_KEEPALIVE) {
      # do something
  }
  elsif ($c->keepalive == Apache2::Const::CONN_CLOSE) {
      # do something else
  }
  elsif ($c->keepalive == Apache2::Const::CONN_UNKNOWN) {
      # do yet something else
  }
  else {
      # die "unknown state";
  }



Notice that new states could be added later by Apache, so your code should make no assumptions and do things only if the desired state matches.

CWkeepalives

How many requests were already served over the current connection.



  $served = $c->keepalives();
  $served = $c->keepalives($new_served);



obj: $c ( Apache2::Connection object )
opt arg1: $new_served (integer) Set the number of served requests over the current connection. Normally you won’t do that when handling HTTP requests. (But see below a note regarding $r->assbackwards).
ret: $served (integer) How many requests were already served over the current connection.

In most handlers, but HTTP output filter handlers, that value doesn’t count the current request. For the latter it’ll count the current request.

since: 2.0.00
This method is only relevant for keepalive connections. The core connection output filter ap_http_header_filter increments this value when the response headers are sent and it decides that the connection should not be closed (see ap_set_keepalive()).

If you send your own set of HTTP headers with $r->assbackwards, which includes the Keep-Alive HTTP response header, you must make sure to increment the keepalives counter.

CWlocal_addr

Get this connection’s local socket address



  $local_sa = $c->local_addr();



obj: $c ( Apache2::Connection object )
ret: $local_sa ( APR::SockAddr object )
since: 2.0.00

CWlocal_host

used for ap_get_server_name when UseCanonicalName is set to DNS (ignores setting of HostnameLookups)



  $local_host = $c->local_host();



obj: $c ( Apache2::Connection object )
ret: $local_host (string)
since: 2.0.00
META: you probably shouldn’t use this method, but ( get_server_name ) if inside request and $r is available.

CWlocal_ip

server IP address



  $local_ip = $c->local_ip();



obj: $c ( Apache2::Connection object )
ret: $local_ip (string)
since: 2.0.00

CWnotes

Get/set text notes for the duration of this connection. These notes can be passed from one module to another (not only mod_perl, but modules in any other language):



  $notes      = $c->notes();
  $prev_notes = $c->notes($new_notes);



obj: $c ( Apache2::Connection object )
opt arg1: $new_notes ( APR::Table object )
ret: $notes ( APR::Table object ) the current notes table.

if the $new_notes argument was passed, returns the previous value.

since: 2.0.00
Also see $r->notes

CWoutput_filters

Get the first filter in a linked list of protocol level output filters:



  $output_filters = $c->output_filters();
  $prev_output_filters = $r->output_filters($new_output_filters);



obj: $c ( Apache2::Connection object )
opt arg1: $new_output_filters Set a new value
ret: $output_filters ( Apache2::Filter object ) The first filter in the connection output filters chain.

If $new_output_filters was passed, returns the previous value.

since: 2.0.00
For an example see: Bucket Brigades-based Protocol Module

CWpool

Pool associated with this connection



  $p = $c->pool();



obj: $c ( Apache2::Connection object )
ret: $p ( APR::Pool object )
since: 2.0.00

CWremote_addr

Get this connection’s remote socket address



  $remote_sa = $c->remote_addr();



obj: $c ( Apache2::Connection object )
ret: $remote_sa ( APR::SockAddr object )
since: 2.0.00

CWremote_ip

Client’s IP address



  $remote_ip      = $c->remote_ip();
  $prev_remote_ip = $c->remote_ip($new_remote_ip);



obj: $c ( Apache2::Connection object )
opt arg1: $new_remote_ip ( string ) If passed a new value will be set
ret: $remote_ip ( string ) current remote ip address

if the optional argument $new_remote_ip was passed the previous value is returned.

since: 2.0.00

CWremote_host

Client’s DNS name:



  $remote_host = $c->remote_host();



obj: $c ( Apache2::Connection object )
ret: $remote_host ( string/undef ) If $c->get_remote_host was run it returns the cached value, which is a client DNS name or "" if it wasn’t found. If the check wasn’t run — undef is returned.
since: 2.0.00
It’s best to to call $c->get_remote_host instead of directly accessing this variable.

Unsupported API

Apache2::Connection also provides auto-generated Perl interface for a few other methods which aren’t tested at the moment and therefore their API is a subject to change. These methods will be finalized later as a need arises. If you want to rely on any of the following methods please contact the the mod_perl development mailing list so we can help each other take the steps necessary to shift the method to an officially supported API.

CWconn_config

Config vector containing pointers to connections per-server config structures



  $ret = $c->conn_config();



obj: $c ( Apache2::Connection object )
ret: $ret ( Apache2::ConfVector object )
since: 2.0.00

CWsbh

META: Autogenerated - needs to be reviewed/completed

handle to scoreboard information for this connection



  $sbh = $c->sbh();



obj: $c ( Apache2::Connection object )
ret: $sbh (XXX)
since: 2.0.00
META: Not sure how this can be used from mod_perl at the moment. Unless Apache2::Scoreboard is extended to provide a hook to read from this variable.

See Also

mod_perl 2.0 documentation.

Copyright

mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.

Authors

The mod_perl development team and numerous contributors.
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perl v5.20.3 WORK::MOD_PERL-2.0.9::DOCS::API::APACHE2::CONNECTION (3) 2015-06-18

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