From 44a0aa91ac18582aa7415943dc37d06220576443 Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Tue, 10 Dec 2013 19:13:37 +0100
Subject: [PATCH] error utils: Make the logger callback configurable.

Don't depend on the plugin module anymore. Rather, add sdb_error_set_logger()
which may be used to set a callback to be used for all logging. Default to
printing to stderr.

sysdbd now uses that to register sdb_plugin_log as logger callback.
---
 src/daemon/sysdbd.c       |  2 ++
 src/include/utils/error.h |  9 +++++++++
 src/utils/error.c         | 16 ++++++++++++++--
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/daemon/sysdbd.c b/src/daemon/sysdbd.c
index 6952c1c..21350f3 100644
--- a/src/daemon/sysdbd.c
+++ b/src/daemon/sysdbd.c
@@ -186,6 +186,8 @@ main(int argc, char **argv)
 	struct sigaction sa_intterm;
 	int status;
 
+	sdb_error_set_logger(sdb_plugin_log);
+
 	while (42) {
 		int opt = getopt(argc, argv, "C:DhV");
 
diff --git a/src/include/utils/error.h b/src/include/utils/error.h
index aaa288c..e170a7d 100644
--- a/src/include/utils/error.h
+++ b/src/include/utils/error.h
@@ -66,6 +66,15 @@ enum {
 		: ((prio) == SDB_LOG_INFO) ? "INFO" \
 		: ((prio) == SDB_LOG_DEBUG) ? "DEBUG" : "UNKNOWN")
 
+/*
+ * sdb_error_set_logger:
+ * Set the logging callback to be used for logging messages. By default (or
+ * when explicitely setting the logger to NULL), logs will be written to the
+ * stderr channel.
+ */
+void
+sdb_error_set_logger(int (*f)(int, const char *));
+
 /*
  * sdb_log:
  * Log the specified message. The string will be formatted in printf-style
diff --git a/src/utils/error.c b/src/utils/error.c
index 5b9b448..6bf64c2 100644
--- a/src/utils/error.c
+++ b/src/utils/error.c
@@ -25,7 +25,6 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "core/plugin.h"
 #include "utils/error.h"
 #include "utils/strbuf.h"
 
@@ -57,6 +56,8 @@ static sdb_error_ctx_t default_error_ctx = SDB_ERROR_INIT;
 static pthread_key_t error_ctx_key;
 static _Bool         error_ctx_key_initialized = 0;
 
+static int (*logger)(int prio, const char *msg) = NULL;
+
 /*
  * private helper functions
  */
@@ -163,7 +164,12 @@ sdb_do_log(int prio)
 	if (ctx->logged)
 		return 0;
 
-	ret = sdb_plugin_log(prio, sdb_strbuf_string(ctx->msg));
+	if (logger)
+		ret = logger(prio, sdb_strbuf_string(ctx->msg));
+	else
+		ret = fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio),
+				sdb_strbuf_string(ctx->msg));
+
 	ctx->logged = 1;
 	return ret;
 } /* sdb_do_log */
@@ -172,6 +178,12 @@ sdb_do_log(int prio)
  * public API
  */
 
+void
+sdb_error_set_logger(int (*f)(int, const char *))
+{
+	logger = f;
+} /* sdb_error_set_logger */
+
 int
 sdb_log(int prio, const char *fmt, ...)
 {
-- 
2.30.2