File Coverage

blib/lib/App/BigQuery/Importer/MySQL.pm

Criterion	Covered	Total	%
statement	31	91	34.0
branch	2	32	6.2
condition			n/a
subroutine	9	10	90.0
pod	0	2	0.0
total	42	135	31.1

package App::BigQuery::Importer::MySQL;
use 5.008001;
use strict;
use warnings;
use Getopt::Long qw(:config posix_default no_ignore_case gnu_compat);
use File::Temp qw(tempfile);
use File::Basename;
use DBI;
use Carp qw(croak);

our $VERSION = "0.023";

sub new {
    my ($class, $args) = @_;

    my @required_list = qw/ src dst mysqlhost mysqluser mysqlpassword project_id progs /;
    my $obj_data = +{};
    for my $required (@required_list) {
        if( ! defined $args->{$required} ) { croak "$required is required"};
        $obj_data->{$required} = $args->{$required};
    }
    $obj_data->{dryrun} = $args->{dryrun},

    bless $obj_data, $class;
}

sub run {
    my $self = shift;

    my $db_host                  = $self->{'mysqlhost'};
    my ($src_schema, $src_table) = split /\./, $self->{'src'};
    my ($dst_schema, $dst_table) = split /\./, $self->{'dst'};

    # check the table does not have BLOB or TEXT
    my $dbh = DBI->connect("dbi:mysql:${src_schema}:${db_host}", $self->{'mysqluser'}, $self->{'mysqlpassword'});
    my $blob_text_check_sql = "SELECT SUM(IF((DATA_TYPE LIKE '%blob%' OR DATA_TYPE LIKE '%text%'),1, 0)) AS cnt
        FROM INFORMATION_SCHEMA.columns
        WHERE TABLE_SCHEMA = '${src_schema}' AND TABLE_NAME = '${src_table}'";
    my $cnt = $dbh->selectrow_hashref($blob_text_check_sql);
    if ($cnt->{cnt} > 0) {
        die "${src_schema}.${src_table} has BLOB or TEXT table";
    }

    # create BigQuery schema json structure
    my $schema_type_check_sql = "SELECT
        CONCAT('{\"name\": \"', COLUMN_NAME, '\",\"type\":\"', IF(DATA_TYPE LIKE \"%int%\", \"INTEGER\",IF(DATA_TYPE = \"decimal\",\"FLOAT\",\"STRING\")) , '\"}') AS json
        FROM INFORMATION_SCHEMA.columns where TABLE_SCHEMA = '${src_schema}' AND TABLE_NAME = '${src_table}'";
    my $rows = $dbh->selectall_arrayref($schema_type_check_sql);
    my @schemas;
    for my $row (@$rows) {
        push @schemas, @$row[0];
    }
    my $bq_schema_json = '[' . join(',', @schemas) . ']';
    my($bq_schema_json_fh, $bq_schema_json_filename) = tempfile(UNLINK => 1);
    unless ($self->{'dryrun'}) {
        print {$bq_schema_json_fh} $bq_schema_json;
    }

    # create temporary bucket
    my $bucket_name = $src_table . '_' . time;
    unless ($self->{'dryrun'}) {
        my $mb_command = "$self->{'progs'}->{'gsutil'} mb -p $self->{'project_id'} gs://$bucket_name";
        my $result_create_bucket = system($mb_command);
        if ($result_create_bucket != 0) {
            die "${mb_command} : failed";
        }
    }

    # dump table data
    my $dump_command = "$self->{'progs'}->{'mysql'} -u$self->{'mysqluser'} -p'$self->{'mysqlpassword'}' -h$self->{'mysqlhost'} ${src_schema} -Bse'SELECT * FROM ${src_table}'";
    my $dump_result = `$dump_command`;
    if ($? != 0) {
        die "${dump_command} : failed";
    }
    $dump_result =~ s/\"//g;
    $dump_result =~ s/NULL//g;
    my($src_dump_fh, $src_dump_filename) = tempfile(UNLINK => 1);
    unless ($self->{'dryrun'}) {
        print {$src_dump_fh} $dump_result;
    }

    # upload dump data
    my $dump_upload_command = "$self->{'progs'}->{'gsutil'} cp $src_dump_filename gs://$bucket_name";
    unless ($self->{'dryrun'}) {
        my $result_upload_schema = system($dump_upload_command);
        if ($result_upload_schema != 0) {
            die "${dump_upload_command} : failed";
        }
    }

    # copy to BigQuery
    my $remove_table_command = "$self->{'progs'}->{'bq'} rm -f $self->{'dst'}";
    my $src_dump_file_basename = basename($src_dump_filename);
    unless ($self->{'dryrun'}) {
        my $result_remove_table = system($remove_table_command);
        if ($result_remove_table != 0) {
            die "${remove_table_command} : failed";
        }
        my $load_dump_command = "$self->{'progs'}->{'bq'} load -F '\\t' --max_bad_record=300 $self->{'dst'} gs://${bucket_name}/${src_dump_file_basename} ${bq_schema_json_filename}";
        my $result_load_dump = system($load_dump_command);
        if ($result_load_dump != 0) {
            die "${load_dump_command} : failed";
        }
    }

    # remove dump data
    my $dump_rm_command = "$self->{'progs'}->{'gsutil'} rm gs://${bucket_name}/${src_dump_file_basename}";
    unless ($self->{'dryrun'}) {
        my $result_dump_rm = system($dump_rm_command);
        if ($result_dump_rm != 0) {
            die "${dump_rm_command} : failed";
        }
    }

    # remove bucket
    my $bucket_rm_command = "$self->{'progs'}->{'gsutil'} rb -f gs://$bucket_name";
    unless ($self->{'dryrun'}) {
        my $result_bucket_rm = system($bucket_rm_command);
        if ($result_bucket_rm != 0) {
            die "${dump_rm_command} : failed";
        }
    }
}

1;
__END__