core: dprint - include time in stderr json log

This patch introduces a new "time" field for JSON logging to stderr. The
CEE format already includes this field, but the Kamailio-specific format
doesn't. If you need timestamps in your structured logs, but don't want
to use the CEE format due to its limitations, this patch'd give you the
best of both worlds.

src/core/dprint.c

@@ -573,31 +573,31 @@ static int _ksr_slog_json_flags = 0;
 	".callid\": \"%.*s\"%s%s%.*s%s,"                                     \
 	" \"%smessage\": %s%.*s%s }%s"
 
-#define KSR_SLOG_STDERR_JSON_FMT                                         \
-	"{ \"idx\": %d, \"pid\": %d, \"level\": \"%s\","                     \
-	" \"module\": \"%s\", \"file\": \"%s\","                             \
-	" \"line\": %d, \"function\": \"%s\"%.*s%s%s%.*s%s, \"%smessage\": " \
+#define KSR_SLOG_STDERR_JSON_FMT                                              \
+	"{ \"time\": \"%s.%09luZ\", \"idx\": %d, \"pid\": %d, \"level\": \"%s\"," \
+	" \"module\": \"%s\", \"file\": \"%s\","                                  \
+	" \"line\": %d, \"function\": \"%s\"%.*s%s%s%.*s%s, \"%smessage\": "      \
 	"%s%.*s%s }%s"
 
-#define KSR_SLOG_STDERR_JSON_CFMT                                           \
-	"{ \"idx\": %d, \"pid\": %d, \"level\": \"%s\","                        \
-	" \"module\": \"%s\", \"file\": \"%s\","                                \
-	" \"line\": %d, \"function\": \"%s\", \"callid\": \"%.*s\"%s%s%.*s%s, " \
+#define KSR_SLOG_STDERR_JSON_CFMT                                             \
+	"{ \"time\": \"%s.%09luZ\", \"idx\": %d, \"pid\": %d, \"level\": \"%s\"," \
+	" \"module\": \"%s\", \"file\": \"%s\","                                  \
+	" \"line\": %d, \"function\": \"%s\", \"callid\": \"%.*s\"%s%s%.*s%s, "   \
 	"\"%smessage\": %s%.*s%s }%s"
 
-#define KSR_SLOG_STDERR_JSON_PFMT                              \
-	"{ \"" NAME ".idx\": %d, \"" NAME ".pid\": %d, \"" NAME    \
-	".level\": \"%s\","                                        \
-	" \"" NAME ".module\": \"%s\", \"" NAME ".file\": \"%s\"," \
-	" \"" NAME ".line\": %d, \"" NAME                          \
+#define KSR_SLOG_STDERR_JSON_PFMT                                       \
+	"{ \"" NAME ".time\": \"%s.%09luZ\", \"" NAME ".idx\": %d, \"" NAME \
+	".pid\": %d, \"" NAME ".level\": \"%s\","                           \
+	" \"" NAME ".module\": \"%s\", \"" NAME ".file\": \"%s\","          \
+	" \"" NAME ".line\": %d, \"" NAME                                   \
 	".function\": \"%s\"%.*s\"%s%s%.*s%s, \"%smessage\": %s%.*s%s }%s"
 
-#define KSR_SLOG_STDERR_JSON_CPFMT                                   \
-	"{ \"" NAME ".idx\": %d, \"" NAME ".pid\": %d, \"" NAME          \
-	".level\": \"%s\","                                              \
-	" \"" NAME ".module\": \"%s\", \"" NAME ".file\": \"%s\","       \
-	" \"" NAME ".line\": %d, \"" NAME ".function\": \"%s\", \"" NAME \
-	".callid\": \"%.*s\"%s%s%.*s%s,"                                 \
+#define KSR_SLOG_STDERR_JSON_CPFMT                                      \
+	"{ \"" NAME ".time\": \"%s.%09luZ\", \"" NAME ".idx\": %d, \"" NAME \
+	".pid\": %d, \"" NAME ".level\": \"%s\","                           \
+	" \"" NAME ".module\": \"%s\", \"" NAME ".file\": \"%s\","          \
+	" \"" NAME ".line\": %d, \"" NAME ".function\": \"%s\", \"" NAME    \
+	".callid\": \"%.*s\"%s%s%.*s%s,"                                    \
 	" \"%smessage\": %s%.*s%s }%s"
 
 #ifdef HAVE_PTHREAD
@@ -735,9 +735,9 @@ void ksr_slog_json(ksr_logdata_t *kld, const char *format, ...)
 		} else {
 			if(unlikely(log_color))
 				dprint_color(kld->v_level);
-			fprintf(stderr, efmt, process_no, my_pid(), kld->v_lname,
-					kld->v_mname, kld->v_fname, kld->v_fline, kld->v_func,
-					LOGV_CALLID_LEN, LOGV_CALLID_STR, prname, pmb,
+			fprintf(stderr, efmt, iso8601buf, _tp.tv_nsec, process_no, my_pid(),
+					kld->v_lname, kld->v_mname, kld->v_fname, kld->v_fline,
+					kld->v_func, LOGV_CALLID_LEN, LOGV_CALLID_STR, prname, pmb,
 					LOGV_PREFIX_LEN, LOGV_PREFIX_STR, pme, prefmsg, smb,
 					s_out.len, s_out.s, sme,
 					(_ksr_slog_json_flags & KSR_SLOGJSON_FL_NOLOGNL) ? ""