AMQP Specification Transport

AMQP Specification.
Framing
2 Framing
2.1 Frame Layout
A frame encodes a control or a command. Each frame is divided into two distinct areas: a fixed width frame
header, and a variable width frame body containing, when non-empty, an encoded command or control
operation.
+--------------+------------+
| frame header | frame body |
+--------------+------------+
24 bytes *variable*
frame header: The frame header is a fixed size (24 byte) structure that precedes each
frame. The frame header includes information required to parse the
rest of the frame, as well as key session state variables.
frame body: The frame body, when non-empty, contains a command or control
operation encoded as a struct.
2.2 Frame Header
+0 +1 +2 +3
+-------------------------------------------+
0 | size |
+-------------------------------------------+
4 | type | flags | channel |
+-------------------------------------------+ -.
8 | acknowledged | |
+-------------------------------------------+ |
12 | executed | |
+-------------------------------------------+ |
16 | capacity | |
+-------------------------------------------+ |---+
20 | command-id | | |
+-------------------------------------------+ -' |
|
type: 0x00 - control |
0x01 - command |
|
flags: 0|0|0|0|0|0|0|0 - control |
0|0|0|0|0|0|S|F - command |
|
S: sync flag |
F: flush flag |
-. |
reserved - control |---------------+
session state - command |
-'
size: Bytes 0-3 of the frame header contain the frame size. This is an
unsigned 32-bit integer that MUST contain the total frame size
AMQP Transport v. 1-0 Page 3 of 83