Api idés

 

Hi All,

To keep current code light, i think a api interface is one possibly way
to go
for development of different management tools. 

A example for run length encoded minimal api would be:

! Common API framework for Keepalived front daemon's
!
! Purpose to simplify development of different tools and
! front engines for example to a cli interface.
!
! Ide is to have both cmd, message length in int
! and converted to one or more bytes via encoder
!
! It's based on a socket style and minimize bytes to/from clients
!
! All keywords are int from yacc/bison then converted to encoded bytes
!
!

 +----------len------+
every packet have [len][cmd]=[arg1]=[arg..N]

specal byte f1 = delimiter symbol =
 f2 = query symbol ?
 f3 = respond symbol :
 f4 = request_id symbol $

len = encoded byte length

cmd = encoded byte by int of
login,quit,global_defs,virtual_server,etc....

arg = id -> int from parser 

separator =

delimiter space or /

query ?

respond :
 respond codes ok,fail,close = 1,2,3 (int) to f3, so we have a word in
answer.

request_id user generated.

message can be asynchronous and answer in different orders.

encoded length -> 0 - 7f 1 byte
 80 - 3fff 2 byte
 4000 - 1fffff 3 byte
 200000 - fffffff 4 byte
 10000000 - fffffffff 5 byte

request_id is time stamp value for match answer in a reply.

example for a cmd:

[len]?global_defs=smtp_server<!request_id> ( <10 bytes in this example)

response from keepalived:

[len]:ok ( 3 bytes in accept answer )

and some usec later

[len]:reply=<some_data>!<request_id>

another example login:

[len]login ( 2 byte )

answer:

[len]:ok ( 3 byte )

[len]:reply=<salt value> ( 4 byte + salt length )

Use salt + combine password + name

[len]login=name=<username>=password=<password><$reqid>

answer:

[len]:ok ( 2 byte )

regs

/Jan Holmberg

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