Hi,

There is no established API for the daemon plugin to communicate with the server in any way.  It is pretty much a drone. The daemon plugin should have a TCP accept thread.  A text protocol would read/write from/to the daemon plugin. The INFORMATION_SCHEMA plugin would connect to the TCP socket, request data, then write it to the user for example.  I'm not that familiar with INFORMATION_SCHEMA plugins myself, but this should be feasible.  

You really should probably just use the storage engine interface though.  The storage engine can have your linked list and you can project out results with select, and modify data with insert/update/delete.

--Justin

--Justin

On Sun, Oct 4, 2015 at 2:05 PM, Roberto Spadim <roberto@spadim.com.br> wrote:
hummm very nice, i never tried to write a udf with go

going back to daemond plugin, i'm with some doubts, i could make a daemond, i could make a information schema 
both are "easy" my doubt now is how to get data from daemond with information schema plugin, that's something that i don't know how to solve yet

i'm reading the show plugins function and trying to understand how to do this, but no results yet

2015-10-04 17:51 GMT-03:00 Nirbhay Choubey <nirbhay@mariadb.com>:
Hello,

On Sun, Oct 4, 2015 at 9:05 AM, Guillaume Lefranc <guillaume.lefranc@mariadb.com> wrote:
Hi Roberto,

you could have a try at it with Golang, it can wrap C code easily


Though with Go1.5 its now possible, uninstalling the plugins still leads to segfaults.
And sadly, looks like it can't be fixed (not in near future, at least).


Best,
Nirbhay


Best regards,

Guillaume Lefranc
RemoteDBA Services Manager - MariaDB Corporation Ab

On Sun, Oct 4, 2015 at 3:26 AM, Roberto Spadim <roberto@spadim.com.br> wrote:
hummm, it's like creating a ".dll" that export functions to other program call it? in this case your fast bit UDF functions export init/denit functions to mysql, right? and you are using C++ or C language when you use "extern"? i don't  know how compiler know if it's a C or C++ code

2015-10-03 20:36 GMT-03:00 Justin Swanhart <greenlion@gmail.com>:
extern "C" {

Makes the function use CDECL calling conventions, which is equivalent to setting the .NET code to use CDECL calling conventions.  Any language that supports exporting symbols with CDECL calling conventions supports interoperating with C (it stands for C declarations aka C calling conventions).

--Justin

Sent from my iPhone

On Oct 3, 2015, at 1:57 PM, Roberto Spadim <roberto@spadim.com.br> wrote:

sorry guys, i'm a bit confuse about c++ and c

i'm reading your fastbit udf code

at /fb_udf.h
you have a C code, right?
and at fb_udf.cpp a c++ code

you can mix c and c++ at the same code?


at udf.h
what this do?

"
extern "C" {
"
those functions should be undestood as "C" instead of "C++", or compiler should "export" those c++ function to "C" "code", or something related to C and namespaces ?

sorry it's not mysql specific but i'm not finding some C++ plugins examples


2015-09-21 13:43 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
:D nice
what i will is something like:

1) a plugin daemon that receive a tcp/ip connection with a double linked list "feed" (something like:  clear list, delete from position x to y, delete position x, insert at position x, update position x, move position x to y)
2) save this feed to a myisam/spider/innodb/anyother engine (i'm thinking about using a mysql handler api) (i didn't check how it works, but i think handler sock use it)
3) keep the double linked list at memory (reconstruct the list when server shutdown, maybe make some snapshots to avoid a long reconstruct, something like after X lines of feed, save the list, or after x minutes)
4) a engine to read the double linked list at memory (i don't know yet how do this, but i will need some control about reading a shared memory, how to access this shared memory from daemon plugin using storage engine)
5) a engine to read information about what daemon is doing (like 4)
6) at same plugin daemon, create a tcp/ip connection to "export" the same feed to others users (just a proxy, not a big problem)

at top level i think i will have 1 daemon plugin + 1 storage engine plugin

i'm thinking about c++ 11 cause it have double linked lists, threads, atomic, sockets, and i dont need others libs (maybe i'm wrong, but that was my first impression about c++11)

2015-09-21 13:34 GMT-03:00 Justin Swanhart <greenlion@gmail.com>:
Hi,

My fastbit UDF use C++ 11 no problem.


On Fri, Sep 18, 2015 at 11:52 PM, Sergei Golubchik <serg@mariadb.org> wrote:
Hi, Roberto!

On Sep 18, Roberto Spadim wrote:
> guys , i'm still with doubts... but not more about c#, now about c++
> i was thinking about rewrite the code with c++
>
> my doubt is.... could i use C++ 11 ? or i will have problem with mariadb
> makefiles etc etc?

Sure, you  can use any language you want, C++11 is perfectly fine too.
cmake doesn't care.

Regards,
Sergei

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--
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle



--
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle



--
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle

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--
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle

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