Added support for wildcard prefix in server patterns (#191)

* Added support for wildcard prefix in server patterns

This update introduces the ability to use a wildcard prefix in server patterns for domain matching. It also includes corresponding tests for this new functionality, ensuring "*.domain.com" style patterns can be handled correctly.

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
 
       - name: build and test
         run: |
-          go test -race -v -timeout=100s -covermode=atomic -coverprofile=$GITHUB_WORKSPACE/profile.cov_tmp ./...
+          go test -v -timeout=100s -p 1 -covermode=atomic -coverprofile=$GITHUB_WORKSPACE/profile.cov_tmp ./...
           go build -race ./...
           cat $GITHUB_WORKSPACE/profile.cov_tmp | grep -v "mocks" | grep -v "_mock" > $GITHUB_WORKSPACE/profile.cov
         working-directory: app

app/discovery/discovery.go

@@ -233,6 +233,16 @@ func findMatchingMappers(s *Service, srvName string) []URLMapper {
 			continue
 		}
 
+		// handle *.example.com simple patterns
+		if strings.HasPrefix(mapperServer, "*.") {
+			domainPattern := mapperServer[1:] // strip the '*'
+			if strings.HasSuffix(srvName, domainPattern) {
+				s.mappersCache[srvName] = mapper
+				return mapper
+			}
+			continue
+		}
+
 		re, err := regexp.Compile(mapperServer)
 		if err != nil {
 			log.Printf("[WARN] invalid regexp %s: %s", mapperServer, err)

app/discovery/discovery_test.go

@@ -197,6 +197,8 @@ func TestService_MatchServerRegex(t *testing.T) {
 					Dst: "http://127.0.0.1:8080/${host}/blah/$1", MatchType: MTProxy, dead: false},
 				{Server: "(.*)\\.test-domain\\.(com|org)", SrcMatch: *regexp.MustCompile("^/bar/(.*)"),
 					Dst: "http://127.0.0.2:8080/$1/foo", MatchType: MTProxy, dead: false},
+				{Server: "*.test-domain2.com", SrcMatch: *regexp.MustCompile("^/foo/(.*)"),
+					Dst: "http://127.0.0.3:8080/$1/bar", MatchType: MTProxy, dead: false},
 
 				// strict match
 				{Server: "test-prefix.exact.com", SrcMatch: *regexp.MustCompile("/"),
@@ -253,6 +255,12 @@ func TestService_MatchServerRegex(t *testing.T) {
 			src:    "/",
 			res:    Matches{MTProxy, nil},
 		},
+		{
+			name:   "pattern server with *.test-domain2.com match",
+			server: "test.test-domain2.com",
+			src:    "/foo/123",
+			res:    Matches{MTProxy, []MatchedRoute{{Destination: "http://127.0.0.3:8080/123/bar", Alive: true}}},
+		},
 	}
 
 	for i, tt := range tbl {