Re: Perl interface for 0.7.0

[Jonathan Ellis <jb...@gmail.com>]

Hi Jose,

Thanks for the note.  Did you update the wiki page?  You can do so by
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On Sun, Jan 23, 2011 at 6:12 PM, Jose Fonseca <ze...@gmail.com> wrote:
> Hi everyone,
>  just a quick note about the examples up at
> http://wiki.apache.org/cassandra/ThriftExamples#Perl
>
> As is widely known, none of them work using the Thrift-generated Perl
> modules from Cassandra 0.7.0.
>
> As a side note, even after I updated the test script to 0.7.0,
> Thrift::BufferedTransport also would not work, the result is :
> $VAR1 = bless( {
>                 'code' => 0,
>                 'message' => 'TSocket: Could not read 4 bytes from
> localhost:9160'
>               }, 'Thrift::TException' );
>
> After I found a discussion related to a PHP problem with the same sympton, I
> tried changing to Thrift::FramedTransport and it fixes the problem. I've
> included a Perl snippet that works against 0.7.0 - it is based on the
> current Wiki example. The only way to find the method signatures for the
> rest of the API at this time seems to be by reading the code in
> Cassandra/Cassandra.pm and Cassandra/Type.pm. I wish I had the time to
> contribute better Perl documentation, in fact I will if my day job allows me
> some time to.
>
> Best wishes,
> Jose Fonseca
>
>
> #!/usr/bin/perl -w
>
> use strict;
> use warnings;
>
> # Change for your environment
> use lib '/opt/apache-cassandra-0.7.0/interface/gen-perl/';
> use Cassandra::Cassandra;
> use Cassandra::Constants;
> use Cassandra::Types;
>
> use Thrift;
> use Thrift::BinaryProtocol;
> use Thrift::Socket;
> use Thrift::BufferedTransport;
> use Thrift::FramedTransport;
>
> use Data::Dumper;
>
> # localhost and 9160 are default in storage conf for rpc listener
> my $socket = new Thrift::Socket('localhost', 9160);
> my $transport = new Thrift::FramedTransport($socket,1024,1024);
> my $protocol = new Thrift::BinaryProtocol($transport);
> my $client = new Cassandra::CassandraClient($protocol);
>
> eval {
>   $transport->open();
>   my $keyspace = 'test1';
>   my $row_key = 'people_code_1';
>
>   # ColumnParent tells the API the ColumnFamily or SuperColumn we're
> working on
>   my $column_parent      = new Cassandra::ColumnParent({column_family =>
> "people"});
>   my $consistency_level = Cassandra::ConsistencyLevel::ONE;
>   my $auth_request      = new Cassandra::AuthenticationRequest();
>
>   # accessing object internals directly seems to be standard practice on
> the Thrift-generated code
>   $auth_request->{credentials} = { username => 'user', password => 'pass'
> };
>
>   $client->login($auth_request);
>   $client->set_keyspace($keyspace);
>
>   my $timestamp = time;
>
>   my $column = new Cassandra::Column();
>   $column->{name}         = 'name';
>   $column->{value}     = 'Jon Stewart';
>   $column->{timestamp} = time;
>
>   $client->insert($row_key, $column_parent, $column, $consistency_level);
>
>   $column->{name}         = 'tv_show';
>   $column->{value}     = 'The Daily Show';
>   $client->insert($row_key, $column_parent, $column, $consistency_level);
>
>   # -- INSERT ANOTHER TV PERSONALITY ---
>
>   $row_key = 'people_code_2'; # this is analog to a primary key, you'll
> later search for this guy using this key
>
>   $column->{name} = 'name';
>   $column->{value} = 'Stephen Colbert';
>   $column->{timestamp} = time;
>
>   $client->insert($row_key, $column_parent, $column, $consistency_level);
>
>   $column->{name} = 'tv_show';
>   $column->{value} = 'The Colbert Report';
>   $client->insert($row_key, $column_parent, $column, $consistency_level);
>
>   # -- LET's QUERY THE PEOPLE COLUMN FAMILY TO FIND OUT WHO WE HAVE ON FILE
> ---
>
>   my $slice_range = new Cassandra::SliceRange();
>   $slice_range->{start} = "";
>   $slice_range->{finish} = "";
>
>   my $predicate = new Cassandra::SlicePredicate();
>   $predicate->{slice_range} = $slice_range;
>
>   # let's load user with primary key = 'people_code_1'
>   my $result = $client->get_slice('people_code_1', $column_parent,
> $predicate, $consistency_level);
>   print "'people_code_1': " . Dumper($result) . "\n";
>
>   # now, let's load user with primary key = 'people_code_2'
>   $result = $client->get_slice('people_code_2', $column_parent, $predicate,
> $consistency_level);
>   print "'people_code_2': " . Dumper($result) . "\n";
>
>   # nice, eh?
>
>   $transport->close();
> };
>
> if ($@) {
>   warn(Dumper($@));
> }
>
> 1;
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com