Logging in Guile

Logging in Guile

[Zelphir Kaltstahl]

Hi Guile Users!

Is there any library for logging in Guile?

What I imagine is something, where I can log messages of various levels,
like debug, info, error and such. Currently I am using display and
simple-format for all the things, but it would be nice to be able to run
a program and give it some log level, so that only the log messages of
that level or above in importance are shown. Then I could leave all my
logging in my code and set it to debug level or, if intended to be seen
for the user, set it to info level, or if there really is an error, I
could set it to error level.

On a quick search I could not find anything.

Regards,
Zelphir

Re: Logging in Guile

[Alex Sassmannshausen]

Hi Zelphir,

Zelphir Kaltstahl <zelphirkaltstahl@posteo.de> writes:

> Is there any library for logging in Guile?

Guile-Lib contains a set of logging modules.

Have a search for guile-lib in guix, and then check the manual.

HTH,

Alex

Re: Logging in Guile

[John Cowan]

I have a rough proposal now at <
https://bitbucket.org/cowan/r7rs-wg1-infra/src/default/SyslogCowan.md>.  It
depends on either being able to send TCP or UDP packets or preferably to
call the Posix API through the FFI.  It is very basic and leaves log
rotation etc. to the syslog infrastructure.

On Mon, Jan 13, 2020 at 1:10 PM Zelphir Kaltstahl <
zelphirkaltstahl@posteo.de> wrote:

> Hi Guile Users!
>
> Is there any library for logging in Guile?
>
> What I imagine is something, where I can log messages of various levels,
> like debug, info, error and such. Currently I am using display and
> simple-format for all the things, but it would be nice to be able to run
> a program and give it some log level, so that only the log messages of
> that level or above in importance are shown. Then I could leave all my
> logging in my code and set it to debug level or, if intended to be seen
> for the user, set it to info level, or if there really is an error, I
> could set it to error level.
>
> On a quick search I could not find anything.
>
> Regards,
> Zelphir
>
>
>

Re: Logging in Guile

[Roel Janssen]

On Mon, 2020-01-13 at 19:06 +0100, Zelphir Kaltstahl wrote:
> Hi Guile Users!
> 
> Is there any library for logging in Guile?
> 
> What I imagine is something, where I can log messages of various levels,
> like debug, info, error and such. Currently I am using display and
> simple-format for all the things, but it would be nice to be able to run
> a program and give it some log level, so that only the log messages of
> that level or above in importance are shown. Then I could leave all my
> logging in my code and set it to debug level or, if intended to be seen
> for the user, set it to info level, or if there really is an error, I
> could set it to error level.
> 
> On a quick search I could not find anything.
> 
> Regards,
> Zelphir

I'm using a rather simple module that distinguishes errors from warnings and
debug:
https://github.com/UMCUGenetics/sparqling-genomics/blob/master/web/logger.scm

You could implement your own log levels easily..

So you can use it like this:
(log-error "the-calling-function" "A ~a ~a ~a" "format" "like" "format")
(log-debug "the-calling-function" "Similar to ~a" 'log-error)
(log-warning "the-calling-function" "Similar to ~a" 'log-debug)

Then there are three functions that return a port to write to:
(default-error-port) (default-warning-port) (default-debug-port)

When (null? port) => #t, no message is written.

See:
https://github.com/UMCUGenetics/sparqling-genomics/blob/dc5fea515c30aa26ff60b77911438689473d125b/web/ldap/authenticate.scm.in#L148

Kind regards,
Roel Janssen

Re: Logging in Guile

[Zelphir Kaltstahl]

Hi Alex!

Thanks for the hint, I forgot about checking whether there is something
in guile-lib.

I will have a look.

Regards,
Zelphir

On 1/13/20 7:17 PM, Alex Sassmannshausen wrote:
> Hi Zelphir,
>
> Zelphir Kaltstahl <zelphirkaltstahl@posteo.de> writes:
>
>> Is there any library for logging in Guile?
> Guile-Lib contains a set of logging modules.
>
> Have a search for guile-lib in guix, and then check the manual.
>
> HTH,
>
> Alex
>
>
>

Re: Logging in Guile

[Zelphir Kaltstahl]

Thanks, I will also take a look at that!

On 1/13/20 7:47 PM, John Cowan wrote:
> I have a rough proposal now at
> <https://bitbucket.org/cowan/r7rs-wg1-infra/src/default/SyslogCowan.md>. 
> It depends on either being able to send TCP or UDP packets or
> preferably to call the Posix API through the FFI.  It is very basic
> and leaves log rotation etc. to the syslog infrastructure.
>
> On Mon, Jan 13, 2020 at 1:10 PM Zelphir Kaltstahl
> <zelphirkaltstahl@posteo.de <mailto:zelphirkaltstahl@posteo.de>> wrote:
>
>     Hi Guile Users!
>
>     Is there any library for logging in Guile?
>
>     What I imagine is something, where I can log messages of various
>     levels,
>     like debug, info, error and such. Currently I am using display and
>     simple-format for all the things, but it would be nice to be able
>     to run
>     a program and give it some log level, so that only the log messages of
>     that level or above in importance are shown. Then I could leave all my
>     logging in my code and set it to debug level or, if intended to be
>     seen
>     for the user, set it to info level, or if there really is an error, I
>     could set it to error level.
>
>     On a quick search I could not find anything.
>
>     Regards,
>     Zelphir
>
>

Re: Logging in Guile

[Zelphir Kaltstahl]

Hi Roel,

A simple short code is always tempting, thanks. I will check it out!

Regards,
Zelphir

On 1/13/20 10:42 PM, Roel Janssen wrote:
> On Mon, 2020-01-13 at 19:06 +0100, Zelphir Kaltstahl wrote:
>> Hi Guile Users!
>>
>> Is there any library for logging in Guile?
>>
>> What I imagine is something, where I can log messages of various levels,
>> like debug, info, error and such. Currently I am using display and
>> simple-format for all the things, but it would be nice to be able to run
>> a program and give it some log level, so that only the log messages of
>> that level or above in importance are shown. Then I could leave all my
>> logging in my code and set it to debug level or, if intended to be seen
>> for the user, set it to info level, or if there really is an error, I
>> could set it to error level.
>>
>> On a quick search I could not find anything.
>>
>> Regards,
>> Zelphir
> I'm using a rather simple module that distinguishes errors from warnings and
> debug:
> https://github.com/UMCUGenetics/sparqling-genomics/blob/master/web/logger.scm
>
> You could implement your own log levels easily..
>
> So you can use it like this:
> (log-error "the-calling-function" "A ~a ~a ~a" "format" "like" "format")
> (log-debug "the-calling-function" "Similar to ~a" 'log-error)
> (log-warning "the-calling-function" "Similar to ~a" 'log-debug)
>
> Then there are three functions that return a port to write to:
> (default-error-port) (default-warning-port) (default-debug-port)
>
> When (null? port) => #t, no message is written.
>
> See:
> https://github.com/UMCUGenetics/sparqling-genomics/blob/dc5fea515c30aa26ff60b77911438689473d125b/web/ldap/authenticate.scm.in#L148
>
> Kind regards,
> Roel Janssen
>
>