[tarantool-patches] [PATCH] box: fix assertion with duplication in repl. source

[Olga Arkhangelskaia <krishtal.olja@gmail.com>]

When we try to connect one master more than once we used to have
assertion instead of error.

Closes #3610
---
https://github.com/tarantool/tarantool/issues/3610
https://github.com/tarantool/tarantool/tree/OKriw/assert_fail_when_connect_master_twice

 src/box/box.cc            | 14 ++++++++++++++
 test/box-tap/cfg.test.lua |  8 +++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/box/box.cc b/src/box/box.cc
index 8d7454d1f..3a571ae3c 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -369,9 +369,23 @@ static void
 box_check_replication(void)
 {
 	int count = cfg_getarr_size("replication");
+	char *repl[count-1];
 	for (int i = 0; i < count; i++) {
 		const char *source = cfg_getarr_elem("replication", i);
 		box_check_uri(source, "replication");
+		repl[i] = strdup(source);
+		if (repl[i] == NULL) {
+			tnt_raise(OutOfMemory, sizeof(*source), "source", "malloc");
+		}
+		for (int j = i; j >= 1; j--) {
+			if (strcmp(repl[i], repl[j-1]) == 0) {
+				tnt_raise(ClientError, ER_CFG, "replication",
+					  "duplication of replication source");
+			}
+		}
+	}
+	for (int i = 0; i < count; i++) {
+		free(repl[i]);
 	}
 }
 
diff --git a/test/box-tap/cfg.test.lua b/test/box-tap/cfg.test.lua
index 5e72004ca..b227c5edb 100755
--- a/test/box-tap/cfg.test.lua
+++ b/test/box-tap/cfg.test.lua
@@ -6,7 +6,7 @@ local socket = require('socket')
 local fio = require('fio')
 local uuid = require('uuid')
 local msgpack = require('msgpack')
-test:plan(90)
+test:plan(91)
 
 --------------------------------------------------------------------------------
 -- Invalid values
@@ -446,5 +446,11 @@ code = string.format(code_fmt, dir, instance_uuid, uuid.new())
 test:is(run_script(code), PANIC, "replicaset_uuid mismatch")
 fio.rmdir(dir)
 
+--
+--gh-3610: assertion failure when trying to connect to the same master more than once
+--
+status, reason = pcall(box.cfg, {listen = 3303, replication={3303,3303}})
+test:ok(not status and reason:match("Incorrect"), "Duplication of replication source")
+
 test:check()
 os.exit(0)
-- 
2.14.3 (Apple Git-98)