fix: ingress rules order is preserved

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/google/go-cmp v0.6.0
 	github.com/spf13/cobra v1.8.0
-	istio.io/api v1.20.0
+	github.com/stretchr/testify v1.8.4
 	k8s.io/api v0.28.4
 	k8s.io/apimachinery v0.28.4
 	k8s.io/cli-runtime v0.28.4
@@ -15,6 +15,11 @@ require (
 	sigs.k8s.io/gateway-api v0.5.0
 )
 
+require (
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	istio.io/api v1.20.0 // indirect
+)
+
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
@@ -63,7 +68,7 @@ require (
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	istio.io/client-go v1.19.0-alpha.1.0.20231130185426-9f1859c8ff42 // indirect
+	istio.io/client-go v1.19.0-alpha.1.0.20231130185426-9f1859c8ff42
 	k8s.io/klog/v2 v2.110.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20231113174909-778a5567bc1e // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect

go.sum

@@ -109,6 +109,7 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/xlab/treeprint v1.2.0 h1:HzHnuAF1plUN2zGlAFHbSQP2qJ0ZAD3XF5XD7OesXRQ=
 github.com/xlab/treeprint v1.2.0/go.mod h1:gj5Gd3gPdKtR1ikdDK6fnFLdmIS0X30kTTuNd/WEJu0=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

pkg/i2gw/providers/common/converter.go

@@ -269,17 +269,7 @@ func (a *ingressAggregator) toHTTPRoutesAndGateways(options i2gw.ProviderImpleme
 }
 
 func (rg *ingressRuleGroup) toHTTPRoute(options i2gw.ProviderImplementationSpecificOptions) (gatewayv1beta1.HTTPRoute, field.ErrorList) {
-	pathsByMatchGroup := map[pathMatchKey][]ingressPath{}
-	var errors field.ErrorList
-
-	for i, ir := range rg.rules {
-		for j, path := range ir.rule.HTTP.Paths {
-			ip := ingressPath{ruleIdx: i, pathIdx: j, ruleType: "http", path: path}
-			pmKey := getPathMatchKey(ip)
-			pathsByMatchGroup[pmKey] = append(pathsByMatchGroup[pmKey], ip)
-		}
-	}
-
+	pathsByMatchGroup := groupIngressPathsByMatchKey(rg.rules)
 	httpRoute := gatewayv1beta1.HTTPRoute{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      RouteName(rg.name, rg.host),
@@ -301,7 +291,9 @@ func (rg *ingressRuleGroup) toHTTPRoute(options i2gw.ProviderImplementationSpeci
 		httpRoute.Spec.Hostnames = []gatewayv1beta1.Hostname{gatewayv1beta1.Hostname(rg.host)}
 	}
 
-	for _, paths := range pathsByMatchGroup {
+	var errors field.ErrorList
+	for _, key := range pathsByMatchGroup.keys {
+		paths := pathsByMatchGroup.data[key]
 		path := paths[0]
 		fieldPath := field.NewPath("spec", "rules").Index(path.ruleIdx).Child(path.ruleType).Child("paths").Index(path.pathIdx)
 		match, err := toHTTPRouteMatch(path.path, fieldPath, options.ToImplementationSpecificHTTPPathTypeMatch)

pkg/i2gw/providers/common/utils.go

@@ -127,6 +127,31 @@ func ToBackendRef(ib networkingv1.IngressBackend, path *field.Path) (*gatewayv1b
 	}, nil
 }
 
+type orderedIngressPathsByMatchKey struct {
+	keys []pathMatchKey
+	data map[pathMatchKey][]ingressPath
+}
+
+func groupIngressPathsByMatchKey(rules []ingressRule) orderedIngressPathsByMatchKey {
+	// we use a slice instead of a map to preserve rules order
+	pathsByMatchGroup := orderedIngressPathsByMatchKey{
+		keys: []pathMatchKey{},
+		data: map[pathMatchKey][]ingressPath{},
+	}
+
+	for i, ir := range rules {
+		for j, path := range ir.rule.HTTP.Paths {
+			ip := ingressPath{ruleIdx: i, pathIdx: j, ruleType: "http", path: path}
+			pmKey := getPathMatchKey(ip)
+			if _, ok := pathsByMatchGroup.data[pmKey]; !ok {
+				pathsByMatchGroup.keys = append(pathsByMatchGroup.keys, pmKey)
+			}
+			pathsByMatchGroup.data[pmKey] = append(pathsByMatchGroup.data[pmKey], ip)
+		}
+	}
+	return pathsByMatchGroup
+}
+
 func PtrTo[T any](a T) *T {
 	return &a
 }