CLEANUP/MINOR: use distinct temp variables for route matching

Replace the generic `TMP` variable with `tmp_exact` and `tmp_wild` in both HTTP and TLS passthrough frontend rule generation. This prevents potential variable conflicts and improves the clarity of exact and wildcard listener route matching logic in the HAProxy configuration. Additionally, it updates a stale comment to correctly reflect the wildcard matching map.

Author: oktalz

k8s/gate/haproxy/frontends.go

@@ -270,34 +270,34 @@ func (b *HaproxyConfMgrImpl) newFrontend(vListenerName string, vListener *tree.V
 			// Look for route name: selected_listener_route
 			{
 				//  listener-route-name exact match
-				// http-request set-var(txn.TMP)                        var(txn.selected_listener_name),concat("/",txn.host)
-				// http-request set-var(txn.selected_listener_route)    var(txn.TMP),map(listener_route_exact_match)
+				// http-request set-var(txn.tmp_exact)                   var(txn.selected_listener_name),concat("/",txn.host)
+				// http-request set-var(txn.selected_listener_route)    var(txn.tmp_exact),map(listener_route_exact_match)
 				Type:     "set-var",
-				VarName:  "TMP",
+				VarName:  "tmp_exact",
 				VarScope: "txn",
 				VarExpr:  "var(txn.selected_listener_name),concat(\"/\",txn.host)",
 			},
 			{
 				Type:     "set-var",
 				VarName:  "selected_listener_route,ifnotexists",
 				VarScope: "txn",
-				VarExpr:  "var(txn.TMP),map(" + listenerRouteExactMatchMap.Path.FullPath() + ")",
+				VarExpr:  "var(txn.tmp_exact),map(" + listenerRouteExactMatchMap.Path.FullPath() + ")",
 				Metadata: map[string]any{"hug": "listener-route exact match selection"},
 			},
 			{
 				//  listener-route-name wildcard match
-				// http-request set-var(txn.TMP)                        var(txn.selected_listener_name),concat("/",txn.hostreversed)
-				// http-request set-var(txn.selected_listener_route)    var(txn.TMP),map(listener_route_exact_match)
+				// http-request set-var(txn.tmp_wild)                    var(txn.selected_listener_name),concat("/",txn.hostreversed)
+				// http-request set-var(txn.selected_listener_route)    var(txn.tmp_wild),map_beg(listener_route_wildcard_match)
 				Type:     "set-var",
-				VarName:  "TMP",
+				VarName:  "tmp_wild",
 				VarScope: "txn",
 				VarExpr:  "var(txn.selected_listener_name),concat(\"/\",txn.hostreversed)",
 			},
 			{
 				Type:     "set-var",
 				VarName:  "selected_listener_route,ifnotexists",
 				VarScope: "txn",
-				VarExpr:  "var(txn.TMP),map_beg(" + listenerRouteWildcardMatchMap.Path.FullPath() + ")",
+				VarExpr:  "var(txn.tmp_wild),map_beg(" + listenerRouteWildcardMatchMap.Path.FullPath() + ")",
 				Metadata: map[string]any{"hug": "listener-route wildcard match selection"},
 			},
 			// -------------------
@@ -549,10 +549,10 @@ func tlsPassthroughRules(
 			Metadata: map[string]any{"hug": "listener wildcard match selection"},
 		},
 		{
-			// tcp-request content set-var(sess.TMP) var(sess.selected_listener_name),concat("/",sess.sni)
+			// tcp-request content set-var(sess.tmp_exact) var(sess.selected_listener_name),concat("/",sess.sni)
 			Type:     "content",
 			Action:   "set-var",
-			VarName:  "TMP",
+			VarName:  "tmp_exact",
 			VarScope: "sess",
 			Expr:     "var(sess.selected_listener_name),concat(\"/\",sess.sni)",
 		},
@@ -561,14 +561,14 @@ func tlsPassthroughRules(
 			Action:   "set-var",
 			VarName:  "selected_listener_route",
 			VarScope: "sess",
-			Expr:     "var(sess.TMP),map(" + listenerRouteExactMatch + ")",
+			Expr:     "var(sess.tmp_exact),map(" + listenerRouteExactMatch + ")",
 			Metadata: map[string]any{"hug": "listener-route exact match selection"},
 		},
 		{
-			// tcp-request content set-var(sess.TMP) var(sess.selected_listener_name),concat("/",sess.snireversed)
+			// tcp-request content set-var(sess.tmp_wild) var(sess.selected_listener_name),concat("/",sess.snireversed)
 			Type:     "content",
 			Action:   "set-var",
-			VarName:  "TMP",
+			VarName:  "tmp_wild",
 			VarScope: "sess",
 			Expr:     "var(sess.selected_listener_name),concat(\"/\",sess.snireversed)",
 		},
@@ -577,7 +577,7 @@ func tlsPassthroughRules(
 			Action:   "set-var",
 			VarName:  "selected_listener_route,ifnotexists",
 			VarScope: "sess",
-			Expr:     "var(sess.TMP),map_beg(" + listenerRouteWildcardMatch + ")",
+			Expr:     "var(sess.tmp_wild),map_beg(" + listenerRouteWildcardMatch + ")",
 			Metadata: map[string]any{"hug": "listener-route wildcard match selection"},
 		},
 		{