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DR-Tarantool-0.44
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/ DR::Tarantool::AsyncClient

NAME

DR::Tarantool::AsyncClient - async client for tarantool

SYNOPSIS

use DR::Tarantool::AsyncClient 'tarantool';

DR::Tarantool::AsyncClient->connect(
    host    => '127.0.0.1',
    port    => 12345,
    spaces  => {
        0   => {
            name    => 'users',
            fields  => [
                qw(login password role),
                {
                    name    => 'counter',
                    type    => 'NUM'
                }
            ],
            indexes => {
                0   => 'login',
                1   => [ qw(login password) ],
            }
        },
        2   => {
            name    => 'roles',
            fields  => [ qw(name title) ],
            indexes => {
                0   => 'name',
                1   => {
                    name    => 'myindex',
                    fields  => [ 'name', 'title' ],
                }
            }
        }
    },
    sub {
        my ($client) = @_;
        ...
    }
);

$client->ping(sub { ... });

$client->insert('space', [ 'user', 10, 'password' ], sub { ... });

$client->call_lua(foo => ['arg1', 'arg2'], sub {  });

$client->select('space', 1, sub { ... });

$client->delete('space', 1, sub { ... });

$client->update('space', 1, [ passwd => set => 'abc' ], sub { .. });

Class methods

connect

Connects to Tarantool:http://tarantool.org, returns (by callback) an object which can be used to make requests.

DR::Tarantool::AsyncClient->connect(
    host                => $host,
    port                => $port,
    spaces              => $spaces,
    reconnect_period    => 0.5,
    reconnect_always    => 1,
    sub {
        my ($obj) = @_;
        if (ref $obj) {
            ... # handle errors
        }
        ...
    }
);

Arguments

host & port

Address where tarantool is started.

spaces

A hash with space description or a DR::Tarantool::Spaces reference.

reconnect_period & reconnect_always

See DR::Tarantool::LLClient for more details.

Attributes

space

Returns a space object by space name or numeric id. See perldoc DR::Tarantool::Spaces for more details.

Worker methods

All methods accept callbacks which are invoked with the following arguments:

status

On success, this field has value 'ok'. The value of this parameter determines the contents of the rest of the callback arguments.

a tuple or tuples or an error code

On success, the second argument contains tuple(s) produced by the request. On error, it contains the server error code.

errorstr

Error string in case of an error.

sub {
    if ($_[0] eq 'ok') {
        my ($status, $tuples) = @_;
        ...
    } else {
        my ($status, $code, $errstr) = @_;
    }
}

ping

Ping the server.

$client->ping(sub { ... });

Arguments

cb

insert

Insert a tuple into a space.

$client->insert('space', [ 'user', 10, 'password' ], sub { ... });
$client->insert('space', \@tuple, $flags, sub { ... });

Arguments

space_name
tuple
flags (optional)

Possible flags are described in perldoc ":constant" in DR::Tarantool.

callback

call_lua

Call a Lua function. All arguments are passed to Lua as binary strings. Returned tuples can be unpacked using either a space description or a format specification.

$client->call_lua(foo => ['arg1', 'arg2'], sub {  });
$client->call_lua(foo => [], 'space_name', sub { ... });
$client->call_lua(foo => \@args,
    flags => $f,
    space => $space_name,
    sub { ... }
);
$client->call_lua(foo => \@args,
    fields => [ qw(a b c) ],
    sub { ... }
);
$client->call_lua(foo => \@args,
    fields => [ qw(a b c), { type => 'NUM', name => 'abc'} ... ],
    sub { ... }
);

Arguments

function name
function arguments
space or fields

Is optional. If given, this space description will be used to interpret contents of tuples returned by the procedure. Alternatively, instead of providing a reference to a space, the format can be set explicitly with fields argument.

callback

Optional arguments

space

Space name. Use the argument if your function returns tuple(s) from a space described on connect.

fields

Output format of the returned tuple (like 'fields' in connect method).

flags

Reserved option.

args

Format description for stored procedure arguments.

select

Select a tuple from a space by index.

$tuples = $client->select('space', 1, sub { ... });
$tuples = $client->select('space', [1, 2], sub { ... });

$tuples = $client->select('space_name',
        [1,2,3] => 'index_name', sub { ... });

Arguments

space name
key(s)
optional arguments
callback

optional arguments

This section can contain only one element, which is either an index name, or a hash with the following fields:

index

index name or number

limit
offset

delete

Delete a tuple.

$client->delete('space', 1, sub { ... });
$client->delete('space', $key, $flags, sub { ... });

Tuple is always deleted by primary key.

Arguments

space name
key
flags (optional)

Server flags, as described in perldoc ":constant" in DR::Tarantool.

callback

update

Update a tuple.

$client->update('space', 1, [ passwd => set => 'abc' ], sub { .. });
$client->update(
    'space',
    1,
    [ [ passwd => set => 'abc' ], [ login => 'delete' ] ],
    sub { ... }
);

Arguments

space name
key
operation list
flags (optional)

Server flags, as described in perldoc ":constant" in DR::Tarantool.

callback

last_code

The error code returned by the last request (see "last_code" in DR::Tarantool::LLClient).

last_error_string

The error message associated with the last request (see "last_error_string" in DR::Tarantool::LLClient), if there was an error.

COPYRIGHT AND LICENSE

Copyright (C) 2011 Dmitry E. Oboukhov <unera@debian.org>
Copyright (C) 2011 Roman V. Nikolaev <rshadow@rambler.ru>

This program is free software, you can redistribute it and/or
modify it under the terms of the Artistic License.

VCS

The project is placed git repo on github: https://github.com/dr-co/dr-tarantool/.