An exception is thrown while creating a tube

[rybakit]

$t = new \Tarantool();
$t->authenticate('tester', 'tester');
$t->call('queue.create_tube', ['foo', 'fifo']);

Output:

PHP Fatal error:  Uncaught exception 'Exception' with message 'Query error 32: 
unsupported Lua type 'function'' in ...

The tube is created though.

[kostja]

This mis a server-side error: msgpack can't represent a Lua function object returned by crate_tube. 'call' is designed to have calling convention similar to select and return an array of tuples. To do server-side code execution, we added 'eval' to the binary protocol in 1.6, it can return arbitrary msgpack.

We need to make eval available in PHP. Note, that eval requiers a different set of grants compared to call - it requires global 'execute' privilege, as it allows to execute arbitrary Lua code.

[kostja]

So I would consider it an enhancement request to support eval in PHP driver.
The alternative is to make sure msgpack can pack anything on the server side.

[rybakit]

Thanks for the detailed answer. I wonder if it make sense to throw a proper exception for these sort of errors, something like Tarantool\UnsupportedTypeException, or at least TarantoolExeption (or Exception) to be able to handle them accordingly?

[kostja]

Yes, I agree. @bigbes ?

[bigbes]

@kostja, Yes, i agree, it's part of next branch 0.1.* .

[rybakit]

Another option could be to return a special Tarantool\LuaFunction object, which could be later evaluated by Tarantool::eval(). Don't know how useful it will be though.

[bigbes]

Tarantool::evaluate() request is already created and i think #36 is all that needs to be done in this issue.

[rybakit]

@kostja @bigbes The same problem with eval:

$t->eval('return queue.create_tube', ['foo', 'fifo']);
Exception: Query error 32: unsupported Lua type 'function'

$t->eval('queue.create_tube', ['foo', 'fifo']);
Exception: Query error 32: eval:1: '=' expected near '<eof>'

Also,

$t->call('queue.statistics')
Query error 22: Tuple/Key must be MsgPack array

but the result of the queue.statistics call is a table: https://github.com/tarantool/queue/blob/master/queue/abstract.lua#L356.

[kostja]

• Eugene Leonovich [email protected] [15/06/24 11:02]:

  @kostja @bigbes The same problem with eval:

  $t->eval('return queue.create_tube', ['foo', 'fifo']);
  Exception: Query error 32: unsupported Lua type 'function'
  
  $t->eval('queue.create_tube', ['foo', 'fifo']);
  Exception: Query error 32: eval:1: '=' expected near '<eof>'

You apparently are misusing eval.

Should be $t->eval("return queue.create_tube('foo', 'fifo')")

http://tarantool.org - a NoSQL database in a Lua script

[rybakit]

Ah, my bad. But could you please explain why $t->call('queue.statistics') fails?

[rtsisyk]

Wednesday, June 24, 2015 12:41 AM -07:00 from Eugene Leonovich [email protected]:

@kostja @bigbes The same problem with eval :
$t->eval('return queue.create_tube', ['foo', 'fifo']);
Exception: Query error 32: unsupported Lua type 'function'

Try $t->eval('return queue.create_tube(...)', ['foo', 'fifo']);

Eval uses loadstring() under the hood:

fun = loadstrring("eval expression")
msgpack_encode(fun(msgpack_decode(arguments)))

WBR,
Roman Tsisyk [email protected]
http://tarantool.org/ - an efficient in-memory data store and a Lua application server

[rybakit]

@rtsisyk Any hint why call('queue.statistics') fails with Tuple/Key must be MsgPack array?

[kostja]

• Eugene Leonovich [email protected] [15/06/25 11:14]:

  @rtsisyk Any hint why call('queue.statistics') fails with Tuple/Key must be MsgPack array?

Could you please show here the output of queue.statistics() from
the console?

http://tarantool.org - a NoSQL database in a Lua script

[rybakit]

> queue.statistics()
---
- - t:
      tasks:
      - total: 1
      - ready: 1
      - taken: 0
      - buried: 0
      - done: 0
      - delayed: 0
      calls:
      - put: 1
...