Being an external agent, it's confusing that it uses haproxy's internal
types and it seems to have encouraged other implementations to do so.
Let's completely remove any reference to struct sample and use the
native DATA types instead of converting to and from haproxy's sample
types.
The same buffer is used for a request and its response. So we need to be sure
to correctly reset info when the response is encoded. And here there was a
bug. The pointer on the end of the frame was not updated. So it was not
possible to encode a response bigger than the corresponding request.
These encoding functions does general stuff and can be used in
other context than spoe. This patch moves the function spoe_encode_varint
and spoe_decode_varint from spoe to common. It also remove the prefix spoe.
These functions will be used for encoding values in new binary sample fetch.
Now, when a payload is fragmented, the first frame must define the frame type
and the followings must use the special type SPOE_FRM_T_UNSET. This way, it is
easy to know if a fragment is the first one or not. Of course, all frames must
still share the same stream-id and frame-id.
Update SPOA example accordingly.
If an agent want to abort the processing a fragmented NOTIFY frame before
receiving all fragments, it can send an ACK frame at any time with ABORT bit set
(and of course, the FIN bit too).
Beside this change, SPOE_FRM_ERR_FRAMEID_NOTFOUND error flag has been added. It
is set when a unknown ACK frame is received.
Now, we can use the option '-c' to enable the support of a capability. By
default, all capabilities are disabled. For example:
$> ./spoa -c async -c pipelining
In addition, it is also possible to set the maximum frame size supported by your
agent (-m) and to add a delay in frames processing (-t).
A new "option spop-check" statement has been added to enable server health
checks based on SPOP HELLO handshake. SPOP is the protocol used by SPOE filters
to talk to servers.
This is a very simple service that implement a "random" ip reputation
service. It will return random scores for all checked IP addresses. It only
shows you how to implement a ip reputation service or such kind of services
using the SPOE.
