This gist shows inconsistent behaviour of tarantool's socket:receive function which internally uses different buffers for different types of calls

tarantool_socket_receive.txt

Tarantool 2.1.1-434-g881c7b59b
type 'help' for interactive help
tarantool> socket = require('socket')
---
...

tarantool> fiber = require'fiber'
---
...

tarantool> chan = fiber.channel()
---
...

tarantool> fn = function(s) counter = 0; while true do s:write((tostring(counter)):rep(chan:get())); counter = counter + 1 end end
---
...

tarantool> socket.tcp_server('0.0.0.0', 8888, fn)
started
---
- fd: 6
  name:
    host: 0.0.0.0
    family: AF_INET
    type: SOCK_STREAM
    protocol: tcp
    port: 8888
- host: 0.0.0.0
  family: AF_INET
  type: SOCK_STREAM
  protocol: tcp
  port: 8888
...

tarantool> s = socket.connect('localhost', 8888)
---
...

tarantool> chan:put(5)
---
- true
...

tarantool> chan:put(5)
---
- true
...

tarantool> s:receive(5)
---
- '00000'
...

tarantool> chan:put(5)
---
- true
...

tarantool> s:settimeout(1)
---
- 1
...

tarantool> s:receive('*a')
---
- '22222'
...

tarantool> s:receive(5)
---
- '11111'
...