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elmex |
1.1 |
package CFDB; |
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use Carp; |
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use POSIX qw/strftime/; |
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sub write_file { |
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my ($file, $cont) = @_; |
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open my $f, ">", "$file.tmp" |
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or die "Couldn't open file for writing $file.tmp: $!"; |
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print $f $cont |
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or die "Couldn't write to file $file.tmp: $!";; |
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close $f |
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or die "Couldn't close written file $file.tmp: $!"; |
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rename "$file.tmp", $file; |
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} |
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sub read_file { |
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my ($file) = @_; |
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open my $f, "<", "$file" |
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or die "Couldn't open file $file: $!"; |
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return join '', <$f>; |
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} |
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sub new { |
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my ($class, %arg) = @_; |
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my $self = bless { |
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%arg, |
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}, $class; |
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$self->{last_check} = (-M $self->{db_file}) + 1; |
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unless (-e $self->{db_file}) { |
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write_file ($self->{db_file}, cf::to_json ({})); |
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} |
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$self->check_maildb (); |
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$self; |
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} |
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sub check_maildb { |
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my ($self) = @_; |
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if ($self->{last_check} > (-M $self->{db_file})) { |
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$self->{last_check} = -M $self->{db_file}; |
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my $maildb = eval { my $m = cf::from_json read_file $self->{db_file}; return $m }; |
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if ($@) { |
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warn "ERROR when reading mail database $self->{db_file}: $@\n"; |
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$self->{db_file} = $self->{db_file} . ".after_failure"; |
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} else { |
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$self->{maildb} = $maildb; |
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} |
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} |
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} |
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# This is not thread or multiprocess safe! |
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# XXX: A second process will (of course) terribly damage the maildatabase |
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# but i assume there wont be any second process. |
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sub sync_maildb { |
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my ($self) = @_; |
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write_file ($self->{db_file}, cf::to_json ($self->{maildb})); |
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$self->{last_check} = -M $self->{db_file}; |
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} |
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sub get { |
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my ($self, $key) = @_; |
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$self->check_maildb; |
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$self->{maildb}->{$key}; |
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} |
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sub clear { |
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my ($self, $key) = @_; |
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$self->check_maildb; |
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delete $self->{maildb}->{$key}; |
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$self->sync_maildb; |
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} |
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sub set { |
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my ($self, $key, $value) = @_; |
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$self->check_maildb; |
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$self->{maildb}->{$key} = $value; |
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$self->sync_maildb; |
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} |
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