Logging improvements (#1816)

* Add nng_str_sockaddr to get string representation of socket address.

* Added nng_log_get_level() is meant to allow users to obtain the
current level and avoid some possibly expensive operations just
to collect debugging information when debugging is not in effect.

We use a custom logger for NUTS, and this fits within the NUTS
test framework well, so that if -v is supplied we get more content.
All tests now get this by default.

1 files changed, 0 insertions, 53 deletions

diff --git a/docs/man/nng_log_set_logger.adoc b/docs/man/nng_log_set_logger.adoc
deleted file mode 100644
index eedbca49..00000000
--- a/docs/man/nng_log_set_logger.adoc
+++ /dev/null
@@ -1,53 +0,0 @@
-= nng_log_set_logger(3)
-//
-// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_log_set_logger - set logging handler
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-typedef void (*nng_logger)(nng_log_level level, nng_log_facility facility,
-    const char *msgid, const char *msg);
-
-void nng_null_logger(nng_log_level, nng_log_facility, const char *, const char *);
-void nng_stderr_logger(nng_log_level, nng_log_facility, const char *, const char *);
-void nng_system_logger(nng_log_level, nng_log_facility, const char *, const char *);
-
-void nng_log_set_logger(nng_logger logger);
-----
-
-== DESCRIPTION
-
-The `nng_log_set_logger` is used to set the base logging function to _logger_.
-The _logger_ may be a user defined function to process log messages.
-Only a single logger may be registered at a time.
-If needed, the logger should make copies of either _msgid_ or _msg_, as those may not be valid once the logger function returns.
-
-The `nng_null_logger` function is an implementation of `nng_logger` that simply discards the content.
-This is the default logger, so logging is disabled by default.
-
-The `nng_stderr_logger` function is an implementation that logs messages to the standard error stream.
-It will attempt to colorize messages by the severity, if the standard error is a terminal device.
-This can be supressed by setting either the `NO_COLOR` or `NNG_LOG_NO_COLOR` environment variables.
-
-The `nng_system_logger` attempts to use an appropriate system facility to log messages.
-For POSIX systems, this means using `syslog` to process the messages.
-For other the `nng_stderr_log` may be used as a fallback.
-
-== SEE ALSO
-
-xref:nng_log_set_facility.3.adoc[nng_log_set_facility(3)],
-xref:nng_log_set_level.3.adoc[nng_log_set_level(3)],
-xref:nng_log.3.adoc[nng_log(3)]