API for environments

Environments for functions. For now this is just the image URL for the
function run container. In the future, Environments will also have
build container image URLs, and perhaps parameters to those
containers.

Create/read/update/delete/list. Versioning will be added later. For
now, only the latest update is stored.

controller/api_test.go

@@ -152,6 +152,51 @@ func TestHTTPTriggerApi(t *testing.T) {
 	assert(len(ts) == 2, "created two triggers, but didn't find them")
 }
 
+func TestEnvironmentApi(t *testing.T) {
+	testEnv := &fission.Environment{
+		Metadata: fission.Metadata{
+			Name: "xxx",
+			Uid:  "yyy",
+		},
+		RunContainerImageUrl: "gcr.io/xyz",
+	}
+	uid, err := g.client.EnvironmentCreate(testEnv)
+	panicIf(err)
+	m := &fission.Metadata{
+		Name: testEnv.Metadata.Name,
+		Uid:  uid,
+	}
+	defer g.client.EnvironmentDelete(m)
+
+	tr, err := g.client.EnvironmentGet(m)
+	panicIf(err)
+	testEnv.Metadata.Uid = m.Uid
+	assert(*testEnv == *tr, "env should match after reading")
+
+	testEnv.RunContainerImageUrl = "/hi"
+	uid2, err := g.client.EnvironmentUpdate(testEnv)
+	panicIf(err)
+
+	m.Uid = uid2
+	tr, err = g.client.EnvironmentGet(m)
+	panicIf(err)
+	testEnv.Metadata.Uid = m.Uid
+	assert(*testEnv == *tr, "env should match after reading")
+
+	testEnv.Metadata.Name = "yyy"
+	uid, err = g.client.EnvironmentCreate(testEnv)
+	panicIf(err)
+	m = &fission.Metadata{
+		Name: testEnv.Metadata.Name,
+		Uid:  uid,
+	}
+	defer g.client.EnvironmentDelete(m)
+
+	ts, err := g.client.EnvironmentList()
+	panicIf(err)
+	assert(len(ts) == 2, "created two envs, but didn't find them")
+}
+
 func TestMain(m *testing.M) {
 	flag.Parse()
 
@@ -167,6 +212,7 @@ func TestMain(m *testing.M) {
 
 	ks.Delete(context.Background(), "Function", &etcdClient.DeleteOptions{Recursive: true})
 	ks.Delete(context.Background(), "HTTPTrigger", &etcdClient.DeleteOptions{Recursive: true})
+	ks.Delete(context.Background(), "Environment", &etcdClient.DeleteOptions{Recursive: true})
 
 	go api.serve(8888)
 	time.Sleep(500 * time.Millisecond)