[asterisk-dev] AstDB mySQL implementation
Nir Simionovich
nir.simionovich at gmail.com
Sun Oct 29 09:17:44 CDT 2017
Seems like I have under estimated the task at hand, as this part of
Asterisk requires some
more intricate familiarity with how AstDB truly works. It would be one
thing to "change the backend"
it would a far more complex task to "make two backends selectable".
Conclusion - not sure this is worth the effort at this point in time, maybe
in a later stage. :-(
On Thu, Oct 26, 2017 at 6:01 PM Nir Simionovich <nir.simionovich at gmail.com>
wrote:
> Correction, seems like this requires a bit more architecture than I
> anticipated.
>
> Basically, we need to separate this into several files and turn the entire
> AstDB concept
> into a pluggable module type module.
>
> But, as AstDB is a mandatory module for Asterisk, can we create a
> situation where
> a pluggable module is a mandatory requirement for Asterisk to launch
> correctly?
>
> Is there anything like that in Asterisk? can someone point me in some
> proper example
> or preferably, something that I can look at and learn from?
>
>
>
> On Thu, Oct 26, 2017 at 4:47 PM Nir Simionovich <nir.simionovich at gmail.com>
> wrote:
>
>> I'll have a look at it.
>>
>> If I read the code correctly, the AstDB is invoked from the asterisk.c
>> file, when asterisk is launched.
>> I think the best would be to add a configuration file like astdb.conf,
>> which will look something like this:
>>
>> [general]
>> engine=builtin ; values can be either builtin, redis or memcache (or
>> others in the future)
>>
>> ;[redis]
>> ;server = 127.0.0.1
>> ;port = 6379
>> ;database = 15 ; By default AstDB will use Redis database number 15
>>
>> ;[memcache]
>> ;server = 127.0.0.1
>> ;port = 11211
>> ;prefix = asterisk
>>
>> Then, inside the db.c file add the proper statements and backend to
>> support each of these. I'm confident
>> that from a design perspective, this is not optimal, but it would serve
>> as a nice PoC to indicate if the task
>> is feasible or not.
>>
>> For example, the following:
>>
>> DEFINE_SQL_STATEMENT(put_stmt, "INSERT OR REPLACE INTO astdb (key, value)
>> VALUES (?, ?)")
>> DEFINE_SQL_STATEMENT(get_stmt, "SELECT value FROM astdb WHERE key=?")
>> DEFINE_SQL_STATEMENT(del_stmt, "DELETE FROM astdb WHERE key=?")
>> DEFINE_SQL_STATEMENT(deltree_stmt, "DELETE FROM astdb WHERE key || '/'
>> LIKE ? || '/' || '%'")
>> DEFINE_SQL_STATEMENT(deltree_all_stmt, "DELETE FROM astdb")
>> DEFINE_SQL_STATEMENT(gettree_stmt, "SELECT key, value FROM astdb WHERE
>> key || '/' LIKE ? || '/' || '%' ORDER BY key")
>> DEFINE_SQL_STATEMENT(gettree_all_stmt, "SELECT key, value FROM astdb
>> ORDER BY key")
>> DEFINE_SQL_STATEMENT(showkey_stmt, "SELECT key, value FROM astdb WHERE
>> key LIKE '%' || '/' || ? ORDER BY key")
>> DEFINE_SQL_STATEMENT(create_astdb_stmt, "CREATE TABLE IF NOT EXISTS
>> astdb(key VARCHAR(256), value VARCHAR(256), PRIMARY KEY(key))")
>>
>> Can be augmented with something like the following:
>>
>> DEFINE_REDIS_STATEMENT(put_redis_stmt, "");
>> DEFINE_REDIS_STATEMENT(get_redis_stmt, "");
>> DEFINE_REDIS_STATEMENT(del_redis_stmt, "");
>>
>> Following this, we can simply point to the proper statements following
>> the engine selection.
>>
>> What do you think, sounds reasonable?
>>
>>
>> On Thu, Oct 26, 2017 at 4:30 PM Olle E. Johansson <oej at edvina.net> wrote:
>>
>>> On 26 Oct 2017, at 15:25, Nir Simionovich <nir.simionovich at gmail.com>
>>> wrote:
>>>
>>> I suspect the original code didn't change the overall mechanism
>>> dramatically, it's mainly a new implementation.
>>> This thing is this - replacing the implementation seems straight forward
>>> enough, making it configurable, seems
>>> like a pain in the butt.
>>>
>>> Look for the “appleraisin” branch if you want to see code :-)
>>>
>>> /O
>>>
>>>
>>>
>>>
>>> On Thu, Oct 26, 2017 at 4:23 PM Olle E. Johansson <oej at edvina.net>
>>> wrote:
>>>
>>>> On 26 Oct 2017, at 15:20, Nir Simionovich <nir.simionovich at gmail.com>
>>>> wrote:
>>>>
>>>> Just looked into the code, this is not a simple task to put a new
>>>> backend for astdb. The code isn't even designed
>>>> for something like that. Judging from what I can tell, and tell me if
>>>> I'm wrong - turning this into a configurable thing
>>>> would be more or less an open-heart surgery.
>>>>
>>>> My patch wasn’t that bad, but it was before sqlite.
>>>>
>>>> /O
>>>>
>>>>
>>>>
>>>>
>>>> On Thu, Oct 26, 2017 at 4:16 PM Olle E. Johansson <oej at edvina.net>
>>>> wrote:
>>>>
>>>>> Somewhere in Asterisk space, there’s an old patch where I added ASTDB
>>>>> over realtime, meaning you can use
>>>>> any realtime storage. If I remember correctly there was a bit of
>>>>> chicken-and-egg problem with some astdb
>>>>> calls happening before realtime got launched, but otherwise it worked
>>>>> just fine in production for a long time.
>>>>>
>>>>> /O
>>>>>
>>>>> On 26 Oct 2017, at 15:13, Nir Simionovich <nir.simionovich at gmail.com>
>>>>> wrote:
>>>>>
>>>>> I'd like to +1 on that idea.
>>>>>
>>>>> While I'm somewhat reluctant to using mySQL as the base of such a
>>>>> change, as mySQL is an overkill for AstDB,
>>>>> having a proper AstDB configurable backend is an interesting thing.
>>>>> Personally speaking, I would actually prefer
>>>>> something like Memcache or preferably Redis. Both are similar in
>>>>> function and usability to AstDB, both are fairly
>>>>> scalable (Redis specifically) and both are fairly simplistic in
>>>>> nature.
>>>>>
>>>>> I do admit that this got me intrigued...
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Sep 26, 2017 at 12:45 AM Matt Fredrickson <creslin at digium.com>
>>>>> wrote:
>>>>>
>>>>>> On Fri, Sep 22, 2017 at 12:12 PM, Ryan Wagoner <rswagoner at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> I've been scaling out FreePBX horizontally with Kamailio and custom
>>>>>>> FreePBX modules mainly to handle call center outbound dialing (around 20k
>>>>>>> calls per day). One of the issues I ran into was FreePBX uses the AstDB
>>>>>>> extensively and will write changes to it from the dialplan or the FreePBX
>>>>>>> user control panel.
>>>>>>>
>>>>>>> To overcome this I either needed to scrap FreePBX and build a new
>>>>>>> GUI using Asterisk realtime, heavily modify FreePBX (not an option), or
>>>>>>> rewrite AstDB to use a database like mySQL. I choose the last option and
>>>>>>> have had the code in production for just over a month. I'm backing it with
>>>>>>> a two node MariaDB Galera cluster with HAProxy providing failover for the
>>>>>>> client DB connections.
>>>>>>>
>>>>>>> I realize that SQLite was chosen for AstDB for performance reasons.
>>>>>>> However mySQL seems to perform just fine in the above scenario. Right now I
>>>>>>> have a db.c file that just has the mySQL code. Does anybody else have any
>>>>>>> interest in using mySQL for the AstDB backend? I'm debating if it would
>>>>>>> make sense to have the option to select your AstDB backend.
>>>>>>>
>>>>>>
>>>>>> Hey Ryan,
>>>>>>
>>>>>> First off, thanks for letting us know about the fun project you
>>>>>> embarked upon. I think Josh already answered some of your questions, but
>>>>>> with regards to the work you did - I believe that in the past there have
>>>>>> been others who have wanted an ODBC AstDB driver as well. If your code can
>>>>>> be made configurable, it may be a good contribution.
>>>>>>
>>>>>> Anyways, hope you are doing well, and perhaps we'll see your code up
>>>>>> on gerrit at some time in the future. :-)
>>>>>>
>>>>>> --
>>>>>> Matthew Fredrickson
>>>>>> Digium, Inc. | Engineering Manager
>>>>>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>>>>>> <https://maps.google.com/?q=445+Jan+Davis+Drive+NW+-+Huntsville,+AL+35806+-+USA&entry=gmail&source=g>
>>>>>> --
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>>>>>
>>>>> --
>>>>> Kind Regards,
>>>>> Nir Simionovich
>>>>> GreenfieldTech
>>>>> (schedule) http://nirsimionovich.appointy.com/
>>>>> (w) http://www.greenfieldtech.net
>>>>> (p) +972-73-2557799 <073-255-7799> (MSN):
>>>>> nirs at greenfieldtech.net
>>>>> (m) +972-54-6982826 <054-698-2826> (GTALK):
>>>>> nir.simionovich at gmail.com
>>>>> (f) +972-73-2557202 <073-255-7202> (SKYPE): greenfieldtech.nir
>>>>>
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>>>>
>>>> --
>>>> Kind Regards,
>>>> Nir Simionovich
>>>> GreenfieldTech
>>>> (schedule) http://nirsimionovich.appointy.com/
>>>> (w) http://www.greenfieldtech.net
>>>> (p) +972-73-2557799 <073-255-7799> (MSN):
>>>> nirs at greenfieldtech.net
>>>> (m) +972-54-6982826 <054-698-2826> (GTALK):
>>>> nir.simionovich at gmail.com
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>>> --
>>> Kind Regards,
>>> Nir Simionovich
>>> GreenfieldTech
>>> (schedule) http://nirsimionovich.appointy.com/
>>> (w) http://www.greenfieldtech.net
>>> (p) +972-73-2557799 <073-255-7799> (MSN):
>>> nirs at greenfieldtech.net
>>> (m) +972-54-6982826 <054-698-2826> (GTALK):
>>> nir.simionovich at gmail.com
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>>> --
>>
>> Kind Regards,
>>
>> Nir Simionovich
>>
>> GreenfieldTech
>>
>> (schedule) http://nirsimionovich.appointy.com/
>>
>> (w) http://www.greenfieldtech.net
>>
>> (p) +972-73-2557799 <073-255-7799> (MSN):
>> nirs at greenfieldtech.net
>>
>> (m) +972-54-6982826 <054-698-2826> (GTALK):
>> nir.simionovich at gmail.com
>>
>> (f) +972-73-2557202 <073-255-7202> (SKYPE): greenfieldtech.nir
>>
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> --
>
> Kind Regards,
>
> Nir Simionovich
>
> GreenfieldTech
>
> (schedule) http://nirsimionovich.appointy.com/
>
> (w) http://www.greenfieldtech.net
>
> (p) +972-73-2557799 <073-255-7799> (MSN): nirs at greenfieldtech.net
>
> (m) +972-54-6982826 <054-698-2826> (GTALK):
> nir.simionovich at gmail.com
>
> (f) +972-73-2557202 <073-255-7202> (SKYPE): greenfieldtech.nir
>
>
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--
Kind Regards,
Nir Simionovich
GreenfieldTech
(schedule) http://nirsimionovich.appointy.com/
(w) http://www.greenfieldtech.net
(p) +972-73-2557799 (MSN): nirs at greenfieldtech.net
(m) +972-54-6982826 (GTALK): nir.simionovich at gmail.com
(f) +972-73-2557202 (SKYPE): greenfieldtech.nir
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