[tarantool-patches] [PATCH v2 1/2] Fixed non-informative error messages for log conf.

[Olga Arkhangelskaia <arkholga@tarantool.org>]

In case of bad or erroneous options for log configurations
errors had ambiguous or absent messages. In some cases it lead to
app crashes.

Closes #3553
---
 src/box/box.cc            | 66 ++++++++++++++++++++++++++++++-----------------
 src/say.c                 |  5 ++--
 test/box-tap/cfg.test.lua |  2 +-
 3 files changed, 46 insertions(+), 27 deletions(-)

diff --git a/src/box/box.cc b/src/box/box.cc
index 62fd05468..dc607c1ae 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -351,17 +351,41 @@ apply_initial_join_row(struct xstream *stream, struct xrow_header *row)
 
 /* {{{ configuration bindings */
 
+static enum say_format
+box_check_log_format(const char *log_format)
+{
+	enum say_format format = say_format_by_name(log_format);
+	if (format == say_format_MAX)
+		tnt_raise(ClientError, ER_CFG, "log_format",
+			 "expected 'plain' or 'json'");
+	return format;
+}
+
 static void
-box_check_say()
+box_check_format_compatibility(enum say_format format, enum say_logger_type type)
 {
-	const char *log = cfg_gets("log");
-	if (log == NULL)
-		return;
-	enum say_logger_type type;
-	if (say_parse_logger_type(&log, &type) < 0) {
+	if (type == SAY_LOGGER_SYSLOG && format == SF_JSON) {
+		tnt_raise(ClientError, ER_CFG, "log_format",
+			  "'json' can't be used with syslog logger");
+	}
+}
+
+static enum say_logger_type
+box_check_logger_type(const char **log)
+{
+	enum say_logger_type type = SAY_LOGGER_STDERR;
+	if (*log != NULL && say_parse_logger_type(log, &type) < 0) {
 		tnt_raise(ClientError, ER_CFG, "log",
 			  diag_last_error(diag_get())->errmsg);
 	}
+	return type;
+}
+
+static void
+box_check_say()
+{
+	const char *log = cfg_gets("log");
+	enum say_logger_type type = box_check_logger_type(&log);
 
 	if (type == SAY_LOGGER_SYSLOG) {
 		struct say_syslog_opts opts;
@@ -377,27 +401,18 @@ box_check_say()
 	}
 
 	const char *log_format = cfg_gets("log_format");
-	enum say_format format = say_format_by_name(log_format);
-	if (format == say_format_MAX)
-		diag_set(ClientError, ER_CFG, "log_format",
-			 "expected 'plain' or 'json'");
-	if (type == SAY_LOGGER_SYSLOG && format == SF_JSON) {
-		tnt_raise(ClientError, ER_ILLEGAL_PARAMS, "log, log_format");
-	}
+	enum say_format format = box_check_log_format(log_format);
+	box_check_format_compatibility(format, type);
+
 	int log_nonblock = cfg_getb("log_nonblock");
 	if (log_nonblock == 1 && type == SAY_LOGGER_FILE) {
-		tnt_raise(ClientError, ER_ILLEGAL_PARAMS, "log, log_nonblock");
+		tnt_raise(ClientError, ER_CFG, "log_nonblock",
+			  "true' can't be used with file logger type");
+	}
+	if (log_nonblock == 1 && type == SAY_LOGGER_STDERR) {
+		tnt_raise(ClientError, ER_CFG, "log_nonblock",
+			  "'true' can't be used with stderr logger type");
 	}
-}
-
-static enum say_format
-box_check_log_format(const char *log_format)
-{
-	enum say_format format = say_format_by_name(log_format);
-	if (format == say_format_MAX)
-		tnt_raise(ClientError, ER_CFG, "log_format",
-			  "expected 'plain' or 'json'");
-	return format;
 }
 
 static void
@@ -745,7 +760,10 @@ box_set_log_level(void)
 void
 box_set_log_format(void)
 {
+	const char *log = cfg_gets("log");
 	enum say_format format = box_check_log_format(cfg_gets("log_format"));
+	static enum say_logger_type type = box_check_logger_type(&log);
+	box_check_format_compatibility(format, type);
 	say_set_log_format(format);
 }
 
diff --git a/src/say.c b/src/say.c
index ac221dd19..01a0d150d 100644
--- a/src/say.c
+++ b/src/say.c
@@ -541,7 +541,6 @@ log_create(struct log *log, const char *init_str, int nonblock)
 	if (init_str != NULL) {
 		enum say_logger_type type;
 		if (say_parse_logger_type(&init_str, &type)) {
-			diag_set(IllegalParams, logger_syntax_reminder);
 			return -1;
 		}
 		int rc;
@@ -989,8 +988,10 @@ say_parse_logger_type(const char **str, enum say_logger_type *type)
 		*type = SAY_LOGGER_SYSLOG;
 	else if (strchr(*str, ':') == NULL)
 		*type = SAY_LOGGER_FILE;
-	else
+	else {
+		diag_set(IllegalParams, logger_syntax_reminder);
 		return -1;
+	}
 	return 0;
 }
 
diff --git a/test/box-tap/cfg.test.lua b/test/box-tap/cfg.test.lua
index ffafdbe42..ea6f4d646 100755
--- a/test/box-tap/cfg.test.lua
+++ b/test/box-tap/cfg.test.lua
@@ -51,7 +51,7 @@ invalid('vinyl_bloom_fpr', 1.1)
 
 local function invalid_combinations(name, val)
     local status, result = pcall(box.cfg, val)
-    test:ok(not status and result:match('Illegal'), 'invalid '..name)
+    test:ok(not status and result:match('Incorrect'), 'incompatible values'..name)
 end
 
 invalid_combinations("log, log_nonblock", {log = "1.log", log_nonblock = true})
-- 
2.14.3 (Apple Git-98)