Creating Go Client Libraries for KFservice CRD (kubeflow#177)

* updating dependancies for generating static go client files

* Adding a shell script to create the static client for KFservice

* adding generated go client libraries

* Adding the update and verify codegen scripts

* Adding verify codegen to CI process and update codegen to Makefile

* Adding additional deps for client codegen

* update verify-codegen.sh

* Updating hack scripts

Gopkg.toml

@@ -30,7 +30,7 @@ required = [
 [[prune.project]]
   name = "k8s.io/gengo"
   unused-packages = false 
-  
+
 [[prune.project]]
   name = "github.com/tensorflow/tensorflow"
   unused-packages = false

Makefile

@@ -68,6 +68,7 @@ ifndef GOPATH
 	$(error GOPATH not defined, please define GOPATH. Run "go help gopath" to learn more about GOPATH)
 endif
 	go generate ./pkg/... ./cmd/...
+	hack/update-codegen.sh
 
 # Build the docker image
 docker-build: test

hack/update-codegen.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Copyright 2019 The Kubeflow Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+CODEGEN_PKG=${KUBE_ROOT}/vendor/k8s.io/code-generator
+if [ -z "${GOPATH:-}" ]; then
+    export GOPATH=$(go env GOPATH)
+fi
+# Generating KFservice client files
+${CODEGEN_PKG}/generate-groups.sh all "github.com/kubeflow/kfserving/pkg/client" "github.com/kubeflow/kfserving/pkg/apis" serving:v1alpha1

hack/verify-codegen.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Copyright 2019 The Kubeflow Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")/..
+DIFFROOT="${SCRIPT_ROOT}/pkg/client"
+TMP_DIFFROOT="${SCRIPT_ROOT}/_tmp/pkg/client"
+_tmp="${SCRIPT_ROOT}/_tmp"
+# Cleanup script to remove tmp folder
+cleanup() {
+  rm -rf "${_tmp}"
+}
+trap "cleanup" EXIT SIGINT
+# Running cleanup
+cleanup
+# Creating tmp folder to compare generated client code
+mkdir -p "${TMP_DIFFROOT}"
+cp -a "${DIFFROOT}"/* "${TMP_DIFFROOT}"
+# Generating client code to verify
+"${SCRIPT_ROOT}/hack/update-codegen.sh"
+echo "diffing ${DIFFROOT} against freshly generated codegen"
+ret=0
+diff -Naupr "${DIFFROOT}" "${TMP_DIFFROOT}" || ret=$?
+cp -a "${TMP_DIFFROOT}"/* "${DIFFROOT}"
+if [[ $ret -eq 0 ]]
+then
+  echo "${DIFFROOT} up to date."
+else
+  echo "${DIFFROOT} is out of date. Please run hack/update-codegen.sh"
+  exit 1
+fi