Move autoconfiguration implementation into the main module.

Autoconfiguration implementation really needs access to internal fields
and data structures to work properly.

Additionally introduces the concept of GlobalLogService takeover
internally, which allows existing LogService instances to become aware
of a new GlobalLogService. This is needed for
`useForAutoconfiguredLogging` to work as one would naturally expect,
where Loggers that may have already been created (explicitly or
implicitly) by library or third-party code are kept up to date when the
application explicitly configures logging.

src/namespaced_logging/autoconfigured.nim

@@ -1,4 +1,4 @@
-import std/[json, options]
+import std/[json, options, strutils]
 from logging import Level
 import ../namespaced_logging
 
@@ -18,48 +18,29 @@ export
   initConsoleLogAppender,
   initCustomLogAppender,
   initFileLogAppender,
-  formatJsonStructuredLog
-
-var globalLogServiceRef: ThreadLocalLogService = new(LogService)
-globalLogServiceRef[] = initLogService()
-
-var threadLocalLogServiceRef {.threadvar.}: ThreadLocalLogService
-var defaultLogger {.threadvar.}: Option[Logger]
-
-
-proc getThreadLocalLogServiceRef(): ThreadLocalLogService {.inline.} =
-  if threadLocalLogServiceRef.isNil:
-    threadLocalLogServiceRef = new(LogService)
-    threadLocalLogServiceRef[] = globalLogServiceRef[]
-
-  return threadLocalLogServiceRef
-
-proc getDefaultLogger(): Logger {.inline.} =
-
-  if defaultLogger.isNone:
-    defaultLogger = some(getThreadLocalLogServiceRef().getLogger(""))
-
-  return defaultLogger.get
-
-
-proc useForAutoconfiguredLogging*(ls: LogService) =
-  globalLogServiceRef[] = ls
+  formatJsonStructuredLog,
+  useForAutoconfiguredLogging
 
 
 proc setRootLoggingThreshold*(lvl: Level) =
-  setRootThreshold(getThreadLocalLogServiceRef(), lvl)
+  setRootThreshold(getAutoconfiguredLogService(), lvl)
 
 
 proc setLoggingThreshold*(scope: string, lvl: Level) =
-  setThreshold(getThreadLocalLogServiceRef(), scope, lvl)
+  setThreshold(getAutoconfiguredLogService(), scope, lvl)
 
 
 proc addLogAppender*(appender: LogAppender) =
-  addAppender(getThreadLocalLogServiceRef(), appender)
+  addAppender(getAutoconfiguredLogService(), appender)
+
+
+proc clearLogAppenders*() =
+  clearAppenders(getAutoconfiguredLogService())
 
 
 proc getLogger*(scope: string, lvl: Option[Level] = none[Level]()): Logger =
-  getLogger(getThreadLocalLogServiceRef(), scope, lvl)
+  getLogger(getAutoconfiguredLogService(), scope, lvl)
+
 
 template log*(lm: LogMessage) = log(getAutoconfiguredLogger(), lm)