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package Travelynx::Command::database;
use Mojo::Base 'Mojolicious::Command';
use DateTime;
has description => 'Initialize or upgrade database layout';
has usage => sub { shift->extract_usage };
sub get_schema_version {
my ($dbh) = @_;
# We do not want DBD to print an SQL error if schema_version does not
# exist, as this is not an error in this case. Setting $dbh->{PrintError} =
# 0 would disable error printing for all subsequent SQL operations, however,
# we only want to disable it for this specific query. Hence we use a
# prepared statement and only disable error printing only there.
my $sth = $dbh->prepare(qq{select version from schema_version});
$sth->{PrintError} = 0;
my $success = $sth->execute;
if ( not defined $success ) {
return undef;
}
my $rows = $sth->fetchall_arrayref;
if ( @{$rows} == 1 ) {
return $rows->[0][0];
}
else {
printf( "Found multiple schema versions: %s", @{$rows} );
exit(1);
}
}
sub initialize_db {
my ($dbh) = @_;
return $dbh->do(
qq{
create table schema_version (
version integer primary key
);
create table users (
id serial not null primary key,
name varchar(64) not null unique,
status smallint not null,
public_level smallint not null,
email varchar(256),
token varchar(80),
password text,
registered_at timestamptz not null,
last_login timestamptz not null,
deletion_requested timestamptz
);
create table stations (
id serial not null primary key,
ds100 varchar(16) not null unique,
name varchar(64) not null unique
);
create table user_actions (
id serial not null primary key,
user_id integer not null references users (id),
action_id smallint not null,
station_id int references stations (id),
action_time timestamptz not null,
train_type varchar(16),
train_line varchar(16),
train_no varchar(16),
train_id varchar(128),
sched_time timestamptz,
real_time timestamptz,
route text,
messages text
);
create table pending_mails (
email varchar(256) not null primary key,
num_tries smallint not null,
last_try timestamptz not null
);
create table tokens (
user_id integer not null references users (id),
type smallint not null,
token varchar(80) not null,
primary key (user_id, type)
);
insert into schema_version values (0);
}
);
}
my @migrations = (
# v0 -> v1
sub {
my ($dbh) = @_;
return $dbh->do(
qq{
alter table user_actions
add column edited smallint;
drop table if exists monthly_stats;
create table journey_stats (
user_id integer not null references users (id),
year smallint not null,
month smallint not null,
data jsonb not null,
primary key (user_id, year, month)
);
update schema_version set version = 1;
}
);
},
# v1 -> v2
sub {
my ($dbh) = @_;
return $dbh->do(
qq{
update user_actions set edited = 0;
alter table user_actions
alter column edited set not null;
update schema_version set version = 2;
}
);
},
# v2 -> v3
# A bug in the journey distance calculation caused excessive distances to be
# reported for routes covering stations without GPS coordinates. Ensure
# all caches are rebuilt.
sub {
my ($dbh) = @_;
return $dbh->do(
qq{
truncate journey_stats;
update schema_version set version = 3;
}
);
},
);
sub setup_db {
my ($dbh) = @_;
$dbh->begin_work;
if ( initialize_db($dbh) ) {
$dbh->commit;
}
else {
$dbh->rollback;
printf( "Database initialization was not successful: %s",
$DBI::errstr );
}
}
sub migrate_db {
my ($dbh) = @_;
$dbh->begin_work;
my $schema_version = get_schema_version($dbh);
say "Found travelynx schema v${schema_version}";
if ( $schema_version == @migrations ) {
say "Database layout is up-to-date";
}
for my $i ( $schema_version .. $#migrations ) {
printf( "Updating to v%d ...\n", $i + 1 );
if ( not $migrations[$i]($dbh) ) {
say "Aborting migration; rollback to v${schema_version}";
$dbh->rollback;
exit(1);
}
}
if ( get_schema_version($dbh) == @migrations ) {
$dbh->commit;
}
}
sub run {
my ( $self, $command ) = @_;
my $dbh = $self->app->dbh;
if ( not defined $dbh ) {
printf( "Can't connect to the database: %s\n", $DBI::errstr );
exit(1);
}
if ( $command eq 'migrate' ) {
if ( not defined get_schema_version($dbh) ) {
setup_db($dbh);
}
migrate_db($dbh);
}
elsif ( $command eq 'has-current-schema' ) {
if ( get_schema_version($dbh) == @migrations ) {
say "yes";
}
else {
say "no";
exit(1);
}
}
else {
$self->help;
}
}
1;
__END__
=head1 SYNOPSIS
Usage: index.pl database <migrate|has-current-schema>
Upgrades the database layout to the latest schema.
Recommended workflow:
> systemctl stop travelynx
> perl index.pl migrate
> systemctl start travelynx
|
