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lib/App/AltSQL/Model/MySQL.pm  view on Meta::CPAN

package App::AltSQL::Model::MySQL;

=head1 NAME

App::AltSQL::Model::MySQL

=head1 DESCRIPTION

This module is currently the only Model supported by L<App::AltSQL>.

Upon startup, we will read in C<$HOME/.my.cnf> and will read and respect the following configuration variables:

=over 4

=item B<user>

=item B<password>

=item B<host>

=item B<port>

=item B<prompt>

=item B<safe_update>

=item B<select_limit>

=tiem B<no_auto_rehash>

=back

=cut

use Moose;
use DBI;
use Sys::SigAction qw(set_sig_handler);
use Time::HiRes qw(gettimeofday tv_interval);

extends 'App::AltSQL::Model';

has 'sql_parser' => (is => 'ro', default => sub {
	# Let this be deferred until it's needed, and okay for us to proceed if it's not present
	eval {
		require DBIx::MyParsePP;
	};
	if ($@) {
		return 0; # when we use this we check for definedness as well as boolean
	}
	return DBIx::MyParsePP->new();
});
has 'dbh'        => (is => 'rw');
has 'current_database' => (is => 'rw');

has [qw(host user password database port)] => ( is => 'ro' );
has [qw(no_auto_rehash select_limit safe_update prompt)] => ( is => 'ro' );

sub args_spec {
	return (
		host => {
			cli  => 'host|h=s',
			help => '-h HOSTNAME | --host HOSTNAME',
		},
		user => {
			cli  => 'user|u=s',
			help => '-u USERNAME | --user USERNAME',
		},
		password => {
			help => '-p | --password=PASSWORD | -pPASSWORD',
		},
		database => {
			cli  => 'database|d=s',
			help => '-d DATABASE | --database DATABASE',
		},
		port => {
			cli  => 'port=i',
			help => '--port PORT',
		},
		no_auto_rehash => {
			cli  => 'no-auto-rehash|A',
			help => "-A --no-auto-rehash -- Don't scan the information schema for tab autocomplete data",
		},
	);
}

sub setup {
	my $self = shift;
	$self->find_and_read_configs();

	# If the user has configured a custom prompt in .my.cnf and not one in the config, use that in the Term instance
	if ($self->prompt && ! $self->app->config->{prompt}) {
		$self->app->term->prompt( $self->parse_prompt() );
	}
}

sub find_and_read_configs {
	my $self = shift;
	my @config_paths = ( 
		"$ENV{HOME}/.my.cnf",
	);

	foreach my $path (@config_paths) {
		(-e $path) or next;
		$self->read_my_dot_cnf($path);
	}
}

sub read_my_dot_cnf {
	my $self = shift;
	my $path = shift;

	my @valid_keys = qw( user password host port database prompt safe_update select_limit no_auto_rehash ); # keys we'll read
	my @valid_sections = qw( client mysql ); # valid [section] names
	my @boolean_keys = qw( safe_update no_auto_rehash );

	open MYCNF, "<$path";

	# ignore lines in file until we hit a valid [section]
	# then read key=value pairs
	my $in_valid_section = 0;
	while(<MYCNF>) {

		# ignore commented lines:
		/^\s*#/ && next;

		if (/^\s*\[(.*?)\]\s*$/) {                  # we've hit a section
			# verify that we're inside a valid section,
			# and if so, set $in_valid_section
			if ( grep $_ eq $1, @valid_sections ) {
				$in_valid_section = 1;
			} else {
				$in_valid_section = 0;
			}

		} elsif ($in_valid_section) {
			# read a key/value pair
			#/^\s*(.+?)\s*=\s*(.+?)\s*$/;
			#my ($key, $val) = ($1, $2);
			my ($key, $val) = split /\s*=\s*/, $_, 2;

			# value cleanup
			$key =~ s/^\s*(.+?)\s*$/$1/;
			$key || next;
			$key =~ s/-/_/g;

			$val || ( $val = '' );
			$val && $val =~ s/\s*$//;

			# special case for no_auto_rehash, which is 'skip-auto-rehash' in my.cnf
			if ($key eq 'skip_auto_rehash') {
				$key = 'no_auto_rehash';
			}

			# verify that the field is one of the supported ones
			unless ( grep $_ eq $key, @valid_keys ) { next; }

			# if this key is expected to be a boolean, fix the value
			if ( grep $_ eq $key, @boolean_keys ) {
				if ($val eq '0' || $val eq 'false') {
					$val = 0;
				} else {
					# this includes empty values
					$val = 1;
				}
			}

			# override anything that was set on the commandline with the stuff read from the config.
			unless (defined $self->{$key}) { $self->{$key} = $val };
		}
	}

	close MYCNF;
}

sub db_connect {
	my $self = shift;
	my $dsn = 'DBI:mysql:' . join (';',
		map { "$_=" . $self->$_ }
		grep { defined $self->$_ }
		qw(database host port)
	);
	my $dbh = DBI->connect($dsn, $self->user, $self->password, {
		PrintError => 0,
		mysql_auto_reconnect => 1,
		mysql_enable_utf8 => 1,
	}) or die $DBI::errstr . "\nDSN used: '$dsn'\n";
	$self->dbh($dbh);

	## Update autocomplete entries

	if ($self->database) {
		$self->current_database($self->database);
		$self->update_autocomplete_entries($self->database);
	}

	$self->update_db_types();
}

sub update_autocomplete_entries {
	my ($self, $database) = @_;

	return if $self->no_auto_rehash;
	my $cache_key = 'autocomplete_' . $database;
	if (! $self->{_cache}{$cache_key}) {
		$self->log_debug("Reading table information for completion of table and column names\nYou can turn off this feature to get a quicker startup with -A\n");

		my %autocomplete;
		my $rows = $self->dbh->selectall_arrayref("select TABLE_NAME, COLUMN_NAME from information_schema.COLUMNS where TABLE_SCHEMA = ?", {}, $database);
		foreach my $row (@$rows) {
			$autocomplete{$row->[0]} = 1; # Table
			$autocomplete{$row->[1]} = 1; # Column
			$autocomplete{$row->[0] . '.' . $row->[1]} = 1; # Table.Column
		}
		$self->{_cache}{$cache_key} = \%autocomplete;
	}
	$self->app->term->autocomplete_entries( $self->{_cache}{$cache_key} );
}

sub handle_sql_input {
	my ($self, $input, $render_opts) = @_;

	# Figure out the verb of the SQL by either using regex or a parser.  If we
	# use the parser, we get error checking here instead of the server.
	my $verb;
	if (defined $self->sql_parser && $self->sql_parser) {
		# Attempt to parse the input with a SQL parser
		my $parsed = $self->sql_parser->parse($input);
		if (! defined $parsed->root) {
			$self->show_sql_error($input, $parsed->pos, $parsed->line);
			return;
		}

		# Figure out the verb
		my $statement = $parsed->root->extract('statement');
		if (! $statement) {
			$self->log_error("Not sure what to do with this; no 'statement' in the parse tree");
			return;
		}
		$verb = $statement->children->[0];
	}
	else {
		($verb, undef) = split /\s+/, $input, 2;