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Date: Sat, 09 Nov 2013 18:49:52 +0700
From: "first-leon@yandex.ru" <first-leon@yandex.ru>
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To: user@couchdb.apache.org
Subject: Re: Database information from validate_doc_update
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I want set limit base document count.
And now i see one way:
1) In Change Notifications function i see count document in base
2) if size of database larger given: replace validate_doc_update 
function and denied create new docs.

It is long and slow way.
Maybe someone will tell a better implementation?

> Deliberately not, no, a validate_doc_update function is only passed
> the new document you're trying to update, the current one (if there is
> one), the context of the user and the security object for the
> database.
>
> B.
>
>
> On 9 November 2013 11:00, first-leon@yandex.ru <first-leon@yandex.ru> wrote:
>> And i not possible get information about data base from validate_doc_update?
>>
>>> validate_doc_update functions deliberately don't let you do this
>>> otherwise eventually consistency can be compromised.
>>>
>>> Also remember that the native view server has no sandbox, anyone
>>> allowed to edit design documents can do anything to your servers that
>>> the user you run couchdb as can (read files, open network connections,
>>> delete files, etc).
>>>
>>> B.
>>>
>>>
>>> On 9 November 2013 09:02, first-leon@yandex.ru <first-leon@yandex.ru>
>>> wrote:
>>>> It is very good!
>>>> But, i create validation function and see error:
>>>>
>>>> Error: EXIT
>>>>
>>>> {{badmatch,[]},
>>>>    [{couch_query_servers,new_process,3,
>>>> [{file,"couch_query_servers.erl"},{line,472}]},
>>>>     {couch_query_servers,lang_proc,3,
>>>> [{file,"couch_query_servers.erl"},{line,462}]},
>>>>     {couch_query_servers,handle_call,3,
>>>> [{file,"couch_query_servers.erl"},{line,322}]},
>>>>     {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,585}]},
>>>> {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}
>>>>
>>>> I am not understand Erlang code, and not see error details.
>>>> You have it working?
>>>>
>>>> In /etc/couchdb/local.ini i added
>>>> [native_query_servers]
>>>> erlang = {couch_native_process, start_link, []}
>>>>
>>>>
>>>>> Currently, this is possible only via native Erlang query server:
>>>>>
>>>>> fun(NewDoc, OldDoc, {UserCtx}, SecObj) ->
>>>>>      DbName = couch_util:get_value(<<"db">>, UserCtx),
>>>>>      {ok, Db} = couch_db:open_int(DbName, [{user_ctx, UserCtx}]),
>>>>>      {ok, Info} = couch_db:get_db_info(Db),
>>>>>      DiskSize = couch_util:get_value(disk_size, Info),
>>>>>      case DiskSize < 100000 of  %% ~100KB
>>>>>        true ->
>>>>>          ok;
>>>>>        false ->
>>>>>          throw({[{<<"forbidden">>, <<"quota limit reached">>}]})
>>>>>      end,
>>>>>      1
>>>>> end.
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ,,,^..^,,,
>>>>>
>>>>>
>>>>> On Sat, Nov 9, 2013 at 7:56 AM, first-leon@yandex.ru
>>>>> <first-leon@yandex.ru> wrote:
>>>>>> Hello.
>>>>>>
>>>>>> Can I get information about the database as a function of
>>>>>> validate_doc_update? For example, to find out the size of the database
>>>>>> or
>>>>>> the number of documents.
>>>>>>
>>>>>> Example:
>>>>>> function(newDoc, oldDoc, userCtx) {
>>>>>>     if ( thisDb.disk_size > 1000 ) throw({forbidden : 'you have exceeded
>>>>>> the
>>>>>> limit'});
>>>>>> }
>>>>>>
>>>>>> It is possible?
>>>>>>
>>>>>> Thanks.
>>>>