Add an ability to have several loggers from the same alog_* module

[w495]

I need to write different log levels messages in different log files. What should I do? It'ill be nice to use something like this:

[
    {alog, [
            {enabled_loggers,[alog_disk_log1,alog_disk_log2,alog_disk_log3]},
            {install_error_logger_handler, true},
            {flows, [
                {{mod, ['_']}, {'=<', debug}, [alog_disk_log1]},
                {{mod, ['_']}, {'=<', warning}, [alog_disk_log2]},
                {{mod, [alog_examples]}, {'=<', debug}, [alog_disk_log3]}
            ]},
            {alog_disk_log1, [
                {module, alog_disk_log},
                {name, alog_disk_log1},
                {file, "priv/logs/alog_disk_log1.log"},
                {format, external}
            ]},
            {alog_disk_log2, [
                {module, alog_disk_log},
                {name, alog_disk_log2},
                {file, "priv/logs/alog_disk_log2.log"},
                {format, external}
            ]}
            {alog_disk_log3, [
                {module, alog_disk_log},
                {name, alog_disk_log3},
                {file, "priv/logs/alog_disk_log2.log"},
                {format, external}
            ]}
    ]}
].

Is there way to do this with current version of alogger?

[ates]

Alog is dead, isn't? Use lager instead.

[2garryn]

hm.. I think ates is right. Now we don't commit to alogger

[w495]

А гуглогруппах говорили, что не умрет. ((( It is very sad! Lager cannot add handlers at runtime.

[Cy6erBr4in]

Hi,

I'm thinking about resumption of development, and this particular feature is in my TODO (moreover, I heard that this is already implemented in one of the forks, probably a private one, so I'll ask for a pull request).

[Cy6erBr4in]

Now it's possible, here's an example of configuration:

 {alog,
  [{enabled_loggers,
    [{access_log, alog_disk_log},
     {messages_log, alog_disk_log},
    ]},
   {flows,
    [{{mod, ['_']}, {'=<', debug}, [{{messages_log, alog_disk_log}, alog_disk_log}]},
     {{tag, ['access']}, {'=<', debug}, [{{access_log, alog_disk_log}, alog_disk_log}]},
    ]},
   {access_log,
    [{name, access_log},
     {file, "/var/log/your_node/access.log"},
     {format, external}
    ]},
   {messages_log,
    [{name, messages_log},
     {file, "/var/log/your_node/messages.log"},
     {format, external}
    ]},
  ]}

I'll update the documentation soon, so it reflects the code changes.