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# $Id: AutoReconnect.pm,v 1.4 2005/12/01 18:09:52 dk Exp $ |
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package DBIx::Roles::AutoReconnect; |
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use strict; |
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use DBIx::Roles; |
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use vars qw(%defaults $VERSION); |
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$VERSION = '1.00'; |
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%defaults = ( |
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ReconnectTimeout => 60, |
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ReconnectMaxTries => 5, |
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ReconnectFailure => undef, |
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); |
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sub initialize |
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{ |
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my $self = $_[0]; |
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return [], \%defaults; |
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} |
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sub connect |
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{ |
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my ( $self, $conninfo, $dsn, $user, $pass, $attr) = @_; |
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@$conninfo = ( $dsn, $user, $pass, $attr ); |
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my ( $super, $private) = $self-> get_super; |
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return unless $super; |
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my $dbh = db_connect( $self, $conninfo, $super, $private); |
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return $dbh; |
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} |
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sub db_connect |
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{ |
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my ( $self, $conninfo, $ref, @param) = @_; |
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my $attr = $self-> {attr}; |
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my $tries = 0; |
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my $downtime = 0; |
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my $ret; |
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RETRY: while ( 1) { |
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{ |
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my $context = $self-> context; |
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eval { |
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local $conninfo->[3]->{RaiseError} = 1; |
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$ret = $ref->( $self, @param, @$conninfo); |
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}; |
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if ( $@) { |
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# restore context if calls are restarted |
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$self-> context( $context); |
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} elsif ( $ret) { |
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warn "DBIx::Roles::AutoReconnect: successfully reconnected after $tries tries and $downtime sec downtime\n" |
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if $tries > 0 and ( |
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$conninfo->[3]-> {PrintError} or |
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not (exists $conninfo->[3]->{PrintError}) # DBI defaults |
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); |
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last RETRY; |
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} else { |
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$@ = "DBIx::Roles::AutoReconnect: Cannot connect(): no suitable roles found"; |
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} |
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} |
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$attr-> {ReconnectFailure}->() |
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if $attr-> {ReconnectFailure}; |
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$tries++; |
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if ( |
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defined ($attr-> {ReconnectMaxTries}) and |
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$attr-> {ReconnectMaxTries} <= $tries |
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) { |
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$@ = "DBIx::Roles::AutoReconnect: Tried to connect $attr->{ReconnectMaxTries} time(s), giving up\n" |
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unless $@; |
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if ( $conninfo-> [3]-> {RaiseError}) { |
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die $@; |
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} else { |
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warn $@ if |
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not (exists $conninfo->[3]->{PrintError}) # DBI defaults |
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or $conninfo->[3]->{PrintError}; |
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return undef; |
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} |
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} |
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if ( $attr-> {ReconnectTimeout} > 0) { |
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warn "DBIx::AutoReconnect: sleeping for $attr->{ReconnectTimeout} seconds\n" |
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if $conninfo-> [3]->{PrintError}; |
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sleep $attr-> {ReconnectTimeout}; |
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$downtime += $attr-> {ReconnectTimeout}; |
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} |
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} |
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return $ret; |
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} |
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sub dbi_method |
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{ |
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my ( $self, $conninfo, $method, @parameters) = @_; |
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return $self-> super( $method, @parameters) |
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if $method eq 'connect' or not $self->dbh->{AutoCommit}; |
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my ( $wantarray, @ret) = ( wantarray); |
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my ( $super, $private) = $self-> get_super; |
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return unless $super; |
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my $tries = 0; |
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while ( 1) { |
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if ( |
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defined ($self->{attr}-> {ReconnectMaxTries}) and |
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$self->{attr}-> {ReconnectMaxTries} <= $tries |
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) { |
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if ( $conninfo-> [3]-> {RaiseError}) { |
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die "DBIx::Roles::AutoReconnect: Tried to call '$method' $self->{attr}->{ReconnectMaxTries} time(s), giving up\n"; |
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} else { |
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warn "DBIx::Roles::AutoReconnect: Tried to call '$method' $self->{attr}->{ReconnectMaxTries} time(s), giving up\n" if |
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not exists ($conninfo->[3]->{PrintError}) # DBI defaults |
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or $conninfo->[3]->{PrintError}; |
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return; |
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} |
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} |
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$tries++; |
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unless ( $self-> dbh) { |
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$conninfo-> [3]-> {RaiseError} ? |
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croak( "DBIx::Roles::AutoReconnect: not connected" ) : |
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return; |
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} |
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# repeatedly call the roles below until they succeed |
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{ |
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local $self-> object-> {RaiseError} = 1; |
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my $context = $self-> context; |
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eval { |
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if ( $wantarray) { |
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@ret = $super-> ($self, $private, $method, @parameters); |
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} else { |
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$ret[0] = $super-> ($self, $private, $method, @parameters); |
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} |
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}; |
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return wantarray ? @ret : $ret[0] |
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unless $@; |
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# restore context if calls are restarted |
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$self-> context( $context); |
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} |
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if ( $self-> dbh-> ping) { |
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# DB is alive, most probably that was not a DBI-related error |
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if ( $conninfo-> [3]-> {RaiseError}) { |
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die $@; |
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} else { |
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warn $@ if |
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not (exists $conninfo->[3]->{PrintError}) # DBI defaults |
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or $conninfo->[3]->{PrintError}; |
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return; |
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} |
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} else { |
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# without disconnect |
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$self-> dbh( $self-> connect( @$conninfo)); |
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} |
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} |
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} |
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sub STORE |
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{ |
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my ( $self, $conninfo, $key, $val) = @_; |
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if ( $key eq 'ReconnectTimeout' or $key eq 'ReconnectMaxTries') { |
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die "Fatal: '$key' must be a positive integer" |
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unless $val =~ /^\d+$/; |
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} elsif ( $key eq 'ReconnectFailure') { |
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die "Fatal: '$key' must be either 'undef' or a CODE reference" |
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if not defined($val) or not ref($val) or ref($val) ne 'CODE'; |
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} elsif ( not exists $self->{defaults}->{$key}) { |
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# update $attr for eventual reconnects |
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$conninfo->[3]->{$key} = $val; |
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} |
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return $self-> super( $key, $val); |
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} |
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1; |
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__DATA__ |