Modify the set-namespace:

- Define visitNamespace with callback function as params to replace multiple individual object iterations.
- Define Namespace struct to provide callback functions for different iterations

Author: yuwenma

functions/go/set-namespace/go.mod

@@ -2,7 +2,10 @@ module github.com/GoogleContainerTools/kpt-functions-catalog/functions/go/set-na
 
 go 1.17
 
-require github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220322205615-b3b2aa33ba46
+require (
+	github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220322205615-b3b2aa33ba46
+	k8s.io/apimachinery v0.23.4
+)
 
 require (
 	github.com/PuerkitoBio/purell v1.1.1 // indirect

functions/go/set-namespace/go.sum

@@ -39,8 +39,6 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220316202203-f9115a993ebd h1:PzlNXoJTvlzct3n2hw3gmM6C9S/W4wmeaA3qqkM4TTQ=
-github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220316202203-f9115a993ebd/go.mod h1:hENpuHQH/bIfHUCuG4hvzb5i4doJ1KTId5EdWBg6AvU=
 github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220322205615-b3b2aa33ba46 h1:1MUhi+aih7/tGMkU5vmieVSu+U4qEVAJwq4JMX6/Xg0=
 github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0-20220322205615-b3b2aa33ba46/go.mod h1:hENpuHQH/bIfHUCuG4hvzb5i4doJ1KTId5EdWBg6AvU=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
@@ -702,8 +700,6 @@ k8s.io/klog/v2 v2.30.0 h1:bUO6drIvCIsvZ/XFgfxoGFQU/a4Qkh0iAlvUR7vlHJw=
 k8s.io/klog/v2 v2.30.0/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0=
 k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e/go.mod h1:vHXdDvt9+2spS2Rx9ql3I8tycm3H9FDfdUoIuKCefvw=
 k8s.io/kube-openapi v0.0.0-20211115234752-e816edb12b65/go.mod h1:sX9MT8g7NVZM5lVL/j8QyCCJe8YSMW30QvGZWaCIDIk=
-k8s.io/kube-openapi v0.0.0-20220316025549-ddc66922ab18 h1:M0Korml79JW27ndc6lxLxkNP8QVqdpBj0MIEZliKy8A=
-k8s.io/kube-openapi v0.0.0-20220316025549-ddc66922ab18/go.mod h1:p8bjuqy9+BWvBDEBjdeVYtX6kMWWg6OhY1V1jhC9MPI=
 k8s.io/kube-openapi v0.0.0-20220322231758-52feaf8c35bf h1:0debqTr1/MTyyjIkWlBj9ETK0s5rbZ/UDoXih1PBZ4c=
 k8s.io/kube-openapi v0.0.0-20220322231758-52feaf8c35bf/go.mod h1:Z/45zLw8lUo4wdiUkI+v/ImEGAvu3WatcZl3lPMR4Rk=
 k8s.io/utils v0.0.0-20210802155522-efc7438f0176/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=

functions/go/set-namespace/transformer/consts.go

@@ -28,20 +28,7 @@ const (
 	nameIdx             = 4
 )
 
-type UpdateMode int
-
 var (
-	// Users provide the `namespaceSelector`, only update the namespace field matching the`namespaceSelector`.
-	CustomSelector UpdateMode = 1
-
-	// The `namespaceSelector` is not given but the input resource contains one and only one namespace object,
-	// only update the namespace field matching the namespace `metadata.name`.
-	NsObjectSelector UpdateMode = 2
-
-	// Neither `namespaceSelector` or namespace objects are given, require all namespace-scoped resources have unique
-	// namespace value and update this namespace to the new value.
-	Restrict UpdateMode = 3
-
 	// <group>/namespaces/<namespace>/<kind>/<name>
 	namespacedResourcePattern = regexp.MustCompile(`\A([-.\w]*)/namespaces/([-.\w]*)/([-.\w]*)/([-.\w]*)\z`)
 	dependsOnKeyPattern       = func(group, kind, name string) string {