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controllers_test.go
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controllers_test.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"github.com/gin-gonic/gin"
"github.com/go-playground/assert/v2"
"io/ioutil"
"net/http"
"net/http/httptest"
"strings"
"testing"
)
var c = newConstant()
var url = c.V1 + c.Annotator
var method = "POST"
func setupTestRouter() (router *gin.Engine) {
// RUn Gin server for unit test
k8sRespBody, _ := json.Marshal(readExpectedSts())
ts := buildTS(&k8sRespBody)
config := initTestConfig(ts.URL)
router = setupRouter(config)
return
}
func TestHealth(t *testing.T) {
// Verify health check endpoint
// Expected: return 200.
w := httptest.NewRecorder()
req, _ := http.NewRequest("GET", c.V1+c.Healthz, nil)
router := setupTestRouter()
router.ServeHTTP(w, req)
body, _ := ioutil.ReadAll(w.Body)
expect := Health{Health: true}
actual := Health{}
_ = json.Unmarshal(body, &actual)
assert.Equal(t, http.StatusOK, w.Code)
assert.Equal(t, expect, actual)
}
func TestAnnotateStsPod(t *testing.T) {
// Most standard case. Receive Statefulset Pod creation event.
// This case expect the created pod doesn't have any annotations.
// Expected: Return 200 with annotations.
f := readFile("test/admissionRequest.json")
w := sendRequest(f)
actual := unmarshalActual(w)
expect := unmarshalExpected(f)
assertCommon(t, w.Code, expect, actual)
assertPatches(t, expect, actual)
}
func TestAnnotateStsPodWithAnnotations(t *testing.T) {
// Most standard case. Receive Statefulset Pod creation event.
// This case expect the created pod has some annotations.
// Expected: Return 200 with annotations.
f := readFile("test/admissionRequestWithAnnotations.json")
w := sendRequest(f)
actual := unmarshalActual(w)
expect := unmarshalExpected(f)
assertCommon(t, w.Code, expect, actual)
assertPatches(t, expect, actual)
}
func TestAnnotateNoStsPod(t *testing.T) {
// Pod Creation Event (Other than Statefulset)
// Expected Behavior: Skip adding annotation as the pod doesn't belong to Statefulset. Just return 200.
f := readFile("test/admissionRequestNoSts.json")
w := sendRequest(f)
actual := unmarshalActual(w)
expect := unmarshalExpected(f)
assertCommon(t, w.Code, expect, actual)
assert.Equal(t, "", actual.Response.Patch)
assert.Equal(t, "", actual.Response.PatchType)
}
func TestAnnotateStsPodInvalidReq(t *testing.T) {
// Pod Creation Event with invalid json.
// Edge test case, just in case k8s's Admission Json object got changed.
// Expected: Return 400.
f := readFile("test/admissionRequestInvalid.json")
w := sendRequest(f)
actual := unmarshalActual(w)
assertFailed(t, http.StatusBadRequest, w.Code, actual)
}
func TestAnnotateStsNotFound(t *testing.T) {
// Pod Creation Event but the Statefulset has been gone somehow.
// Edge test case.
// Expected: Return 500
f := readFile("test/admissionRequestStsNotFound.json")
w := sendRequest(f)
actual := unmarshalActual(w)
assertFailed(t, http.StatusInternalServerError, w.Code, actual)
}
func assertCommon(t *testing.T, statusCode int, expect AdmissionRequest, actual AdmissionResponse) {
assert.Equal(t, http.StatusOK, statusCode)
assert.Equal(t, expect.Request.UID, actual.Response.UID)
assert.Equal(t, true, actual.Response.Allowed)
}
func assertFailed(t *testing.T, expectCode int, actualCode int, actual AdmissionResponse) {
assert.Equal(t, expectCode, actualCode)
assert.Equal(t, true, actual.Response.Allowed)
assert.Equal(t, "", actual.Response.Patch)
assert.Equal(t, "", actual.Response.PatchType)
}
func assertPatches(
t *testing.T,
expect AdmissionRequest,
actual AdmissionResponse) {
assert.Equal(t, "jsonpatch", strings.ToLower(actual.Response.PatchType))
patches := unmarshalPatches(actual.Response.Patch)
podNameSplit := strings.Split(expect.Request.Object.Metadata.Name, "-")
podIndex := podNameSplit[len(podNameSplit)-1]
podReplicas := "3" // TODO: use K8s mock api server response to verify the pod replicas
c := newConstant()
for i := range patches {
patch := patches[i]
if patch.Path == c.AnnotationsPath {
patchMap := patch.Value.(map[string]interface{})
actualPodIndex := patchMap["sts-annotator/pod-index"].(string)
actualPodReplicas := patchMap["sts-annotator/pod-replicas"].(string)
assert.Equal(t, podIndex, actualPodIndex)
assert.Equal(t, podReplicas, actualPodReplicas)
} else if patch.Path == c.PodIndexPath {
assert.Equal(t, podIndex, patch.Value)
} else if patch.Path == c.PodReplicasPath {
assert.Equal(t, podReplicas, patch.Value)
} else {
t.Error(
fmt.Sprintf("JsonPath must be either of %s, %s or %s. But got %s",
c.AnnotationsPath, c.PodReplicasPath, c.PodIndexPath, patch.Path))
}
}
}
func sendRequest(body []byte) (w *httptest.ResponseRecorder) {
w = httptest.NewRecorder()
req, _ := http.NewRequest(method, url, bytes.NewBuffer(body))
router := setupTestRouter()
router.ServeHTTP(w, req)
return
}
func unmarshalActual(w *httptest.ResponseRecorder) (actual AdmissionResponse) {
actual = AdmissionResponse{}
body, _ := ioutil.ReadAll(w.Body)
_ = json.Unmarshal(body, &actual)
return
}
func unmarshalExpected(request []byte) (expect AdmissionRequest) {
expect = AdmissionRequest{}
json.Unmarshal(request, &expect)
return
}
func unmarshalPatches(base64EncodedPatch string) (patches []Patch) {
patches = []Patch{}
decodedPatch, _ := base64.StdEncoding.DecodeString(base64EncodedPatch)
json.Unmarshal(decodedPatch, &patches)
return
}