A playground for sockets, redis and more in c.
A description of the Redis protocol specification.
+----------+--------+--------+--------+
|8-bit type|var data|16-bit terminator|
+----------+--------+--------+--------+
Data size and protocol varies based on reply type.
Types
Binary Dec Hex Character
======== === === =========
00101011 43 2B +
00101101 45 2D -
00111010 58 3A :
00100100 36 24 $
00101010 42 2A *
Terminator/separator
Binary Dec Hex Character
======== === === =========
00001010 10 A LF
00001101 13 D CR
Data
Data size varies based on type.
+ status.
Variable len data, termintated by CRLF
Status reply `OK` ascii encoded
+OK\r\n
Status reply `OK` binary ascii encoded
+--------+--------+--------+--------+--------+
|00101011|01001111|01001011|00001101|00001010|
+--------+--------+--------+--------+--------+
type data terminator
- err.
Variable len data, termintated by CRLF.
See status type for example.
: integer.
Variable len string repr an integer, terminated by
CRLF. Can be as big as 64-bit signed int.
Integer reply `50` ascii encoded
:50\r\n
Integer reply `50` binary ascii encoded
+--------+--------+--------+--------+--------+
|00111010|00110101|00110000|00001101|00001010|
+--------+--------+--------+--------+--------+
type data terminator
$ bulk.
Variable len data. The len of the payload is specified
after the type, terminated by CRLF. The payload is then
appended, terminated by CRLF.
The protocol extends to.
+----------+--------+--------+--------+------+--------+--------+
|8-bit type|data len|16-bit terminator| data |16-bit terminator|
+----------+--------+--------+--------+------+--------+--------+
Bulk reply `foo` ascii encoded
$3\r\nfoo\r\n
Bulk reply `foo` binary ascii encoded
+--------+--------+--------+--------+
|00100100|00110011|00001101|00001010|
+--------+--------+--------+--------+
type data len terminator
+--------+--------+--------+--------+--------+
|01100110|01101111|01101111|00001101|00001010|
+--------+--------+--------+--------+--------+
data terminator
* multi-bulk.
Multiple bulk replies in a single transmition. Type and
bulk count, terminated by CRLF, is prepended a single
time before N replies. Bulk count denotes how many bulk
reply follow. If bulk count is <= 0 nothing follows.
+----------+----------+--------+--------+
|8-bit type|bulk count|16-bit terminator|
+----------+----------+--------+--------+
Multi-bulk reply `0` ascii encoded
*0\r\n
Multi-bulk reply `0` binary ascii encoded
+--------+--------+--------+--------+
|00100100|00110000|00001101|00001010|
+--------+--------+--------+--------+
type bulk count terminator
structure
ludis_context
holds a handle, an address
Implementes high level methods to read, write, connect
and call redis commands
TODO: move ludis.c here
net_addr
holds information about a socket address
create by calling redis_addr_in, redis_address_in6, etc.
Implements methods to define an anddress
ludis_handle
holds a file descriptor, wb, rb.
Implements mid level methods for connect,
i/o on r/w buffers.
fd
Implements low level read, write, connect_addr, connect_gai
methods. These methods are all quiet simple and only handle
the logic around i/o syscalls
cw
a small program to retrieve the contents of an url
str
Implements a str and a buffer.
http
implements methods to get an url