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|
;# $Id$
;#
;# Copyright (c) 1990-2006, Raphael Manfredi
;#
;# You may redistribute only under the terms of the Artistic License,
;# as specified in the README file that comes with the distribution.
;# You may reuse parts of this distribution only within the terms of
;# that same Artistic License; a copy of which may be found at the root
;# of the source tree for mailagent 3.0.
;#
;# $Log: context.pl,v $
;# Revision 3.0.1.3 1997/02/20 11:43:42 ram
;# patch55: removed the 'do' workaround for perl5.001
;#
;# Revision 3.0.1.2 1995/08/07 16:18:45 ram
;# patch37: fixed parsing bug in perl5.001
;#
;# Revision 3.0.1.1 1994/09/22 14:16:30 ram
;# patch12: added access routines to detect context changes
;# patch12: context is now written back to disk only when changed
;# patch12: added callout queue knowledge
;#
;# Revision 3.0 1993/11/29 13:48:38 ram
;# Baseline for mailagent 3.0 netwide release.
;#
;#
;# Keep track of the mailagent's context, in particular all the actions which
;# may be performed in a batched way and need to save some contextual data.
;#
package context;
#
# General handling
#
# Initialize context from context file
sub init {
&default; # Load a default context
&load if -f $cf'context; # Load context, overwriting default context
&callout'init; # Initialize callout queue
&clean; # Remove uneeded entries from context
}
# Provide a default context
sub default {
%Context = (
'last-clean', '0', # Last cleaning of hash files
);
}
# Load the context entries
sub load {
unless(open(CONTEXT, "$cf'context")) {
&'add_log("WARNING unable to open context file: $!") if $'loglvl > 5;
return;
}
&'add_log("loading mailagent context") if $'loglvl > 15;
local($_, $.);
while (<CONTEXT>) {
next if /^\s*#/;
if (/^([\w\-]+)\s*:\s*(\S+)/) {
$Context{$1} = $2;
next;
}
&'add_log("WARNING context file corrupted, line $.") if $'loglvl > 5;
last;
}
close CONTEXT;
}
# Clean context, removing useless entries
sub clean {
&delete('last-clean') if $cf'autoclean !~ /^on/i && &get('last-clean');
}
# Save a new context file, if it has changed since we read it.
sub save {
return unless $context_changed; # Do not save if no change
local($existed) = -f $cf'context;
&'acs_rqst($cf'context) if $existed; # Lock existing file
unless (open(CONTEXT, ">$cf'context")) {
&'add_log("ERROR cannot overwrite context file: $!") if $'loglvl > 1;
&'free_file($cf'context) if $existed;
return;
}
&'add_log("saving context file $cf'context") if $'loglvl > 17;
local($key, $value, $item);
print CONTEXT "# Mailagent context, last updated " .
scalar(localtime()) . "\n";
while (($key, $value) = each %Context) {
next unless $value;
$item++;
print CONTEXT $key, ': ', $value, "\n";
}
close CONTEXT;
unlink "$cf'context" unless $item; # Do not leave empty context
&'add_log("deleted empty context") if $'loglvl > 17 && !$item;
&'free_file($cf'context) if $existed;
}
#
# Access features
#
# Add or set an entry in the context
sub set {
local($entry, $value) = @_;
$Context{$entry} = $value;
$context_changed++;
}
# Get a context entry value
sub get {
local($entry) = @_;
defined $Context{$entry} ? $Context{$entry} : undef;
}
# Delete an entry from context
sub delete {
local($entry) = @_;
unless (defined $Context{$entry}) {
&'add_log("WARNING attempting to delete inexistant $entry context")
if $'loglvl > 5;
return;
}
delete $Context{$entry};
$context_changed++;
}
#
# Context-dependant actions
#
# Remove entries in dbr hash files which are old enough. For this operation
# to be performed, the autoclean variable must be set to ON in ~/.mailagent,
# the cleanlaps indicates the period for those automatic cleanings, and agemax
# specifies the maximum allowed time within the database.
sub autoclean {
return unless $cf'autoclean =~ /^on/i;
local($period) = &'seconds_in_period($cf'cleanlaps);
return if (&get('last-clean') + $period) > time;
# Retry time reached -- start auto cleaning
&'add_log("autocleaning of dbr files") if $'loglvl > 8;
$period = &'seconds_in_period($cf'agemax);
&dbr'clean($period);
&set('last-clean', time); # Update last cleaning time
}
#
# Perform all contextual actions
#
# Run all the contextual actions, each action returning if not needed or if
# the retry time was not reached. This routine is the main entry point in
# the package, and is the only one called from the outside world.
sub main'contextual_operations {
&autoclean; # Clean dbr hash files
&callout'flush; # Flush the callout queue
&save; # Save new context
}
package main;
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