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HTTP::Proxy::FilterStack

Section: User Contributed Perl Documentation (3)
Updated: 2010-03-30
Index Return to Main Contents

NAME

HTTP::Proxy::FilterStack - A class to manage filter stacks

DESCRIPTION

This class is used internally by "HTTP::Proxy" to manage its four filter stacks.

From the point of view of "HTTP::Proxy::FilterStack", a filter is actually a ("matchsub", "filterobj") pair. The match subroutine (generated by "HTTP::Proxy"'s "push_filter()" method) is run against the current "HTTP::Message" object to find out which filters must be kept in the stack when handling this message.

The filter stack maintains a set of buffers where the filters can store data. This data is appended at the beginning of the next chunk of data, until all the data has been sent.

METHODS

The class provides the following methods:

new( $isbody ): Create a new instance of "HTTP::Proxy::FilterStack". If $isbody is true, then the stack will manage body filters (subclasses of "HTTP::Proxy::BodyFilter").
select_filters( $message ): $message is the current "HTTP::Message" handled by the proxy. It is used (with the help of each filter's match subroutine)
filter( @args ): This method calls all the currently selected filters in turn, with the appropriate arguments.
filter_last(): This method calls all the currently selected filters in turn, to filter the data remaining in the buffers in a single pass.
will_modify(): Return a boolean value indicating if the list of selected filters in the stack will modify the body content. The value is computed from the result of calling "will_modify()" on all selected filters.
all(): Return a list of all filters in the stack.
eod(): Used for END OF DATA bookkeeping.
push(): Push the given "[ match, filterobj ]" pairs at the top of the stack.
insert( $idx, @pairs ): Insert the given "[ match, filterobj ]" pairs at position $idx in the stack.
remove( $idx ): Remove the "[ match, filterobj ]" pair at position $idx in the stack.