fix: distinguish different routes which has the same service (#2840)

Fix #2828.

The bug is introduced in #2121.

Can't be reproduced in over 1 millions requests after applying this
patch.

apisix/plugin.lua

@@ -396,7 +396,8 @@ function _M.merge_service_route(service_conf, route_conf)
     core.log.info("service conf: ", core.json.delay_encode(service_conf))
     core.log.info("  route conf: ", core.json.delay_encode(route_conf))
 
-    local route_service_key = route_conf.modifiedIndex .. "#" .. service_conf.modifiedIndex
+    local route_service_key = route_conf.value.id .. "#"
+        .. route_conf.modifiedIndex .. "#" .. service_conf.modifiedIndex
     return merged_route(route_service_key, service_conf,
                         merge_service_route,
                         service_conf, route_conf)

t/config-center-yaml/route-service.t

@@ -39,6 +39,7 @@ routes:
     -
         uri: /hello
         service_id: 1
+        id: 1
 services:
     -
         id: 1
@@ -62,6 +63,7 @@ hello world
 routes:
     -
         uri: /hello
+        id: 1
         service_id: 1111
 services:
     -
@@ -84,6 +86,7 @@ failed to fetch service configuration by id: 1111
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         service_id: 1
 services:
@@ -115,6 +118,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         service_id: 1
         upstream:
@@ -149,6 +153,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         service_id: 1
         upstream:
@@ -184,6 +189,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         service_id: 1
         upstream:
@@ -211,3 +217,38 @@ GET /hello
 hello world
 --- no_error_log
 [error]
+
+
+
+=== TEST 7: two routes with the same service
+--- yaml_config eval: $::yaml_config
+--- apisix_yaml
+routes:
+    - uris:
+        - /hello
+      service_id: 1
+      id: 1
+      plugins:
+        response-rewrite:
+            body: "hello\n"
+    - uris:
+        - /world
+      service_id: 1
+      id: 2
+      plugins:
+        response-rewrite:
+            body: "world\n"
+services:
+    -
+        id: 1
+        upstream:
+            nodes:
+                "127.0.0.1:1980": 1
+            type: roundrobin
+#END
+--- request
+GET /hello
+--- response_body
+hello
+--- no_error_log
+[error]

t/config-center-yaml/route-upstream.t

@@ -37,6 +37,7 @@ __DATA__
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         upstream_id: 1
 upstreams:
@@ -60,6 +61,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         upstream_id: 1111
 upstreams:
@@ -82,6 +84,7 @@ failed to find upstream by id: 1111
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         upstream_id: 1
         upstream:
@@ -109,6 +112,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /hello
         upstream_id: 1
 upstreams:
@@ -139,6 +143,7 @@ hello world
 --- apisix_yaml
 routes:
     -
+        id: 1
         uri: /get
         upstream_id: 1
 upstreams:

t/config-center-yaml/route.t

@@ -37,6 +37,7 @@ __DATA__
 --- apisix_yaml
 routes:
   -
+    id: 1
     uri: /hello
     upstream:
         nodes:
@@ -82,6 +83,7 @@ use config_center: yaml
 --- apisix_yaml
 routes:
   -
+    id: 1
     uri: /hello
     host: foo.com
     upstream:
@@ -106,6 +108,7 @@ hello world
 stream_routes:
   - server_addr: 127.0.0.1
     server_port: 1985
+    id: 1
     upstream:
       nodes:
         "127.0.0.1:1995": 1