kubebuilder_client.go

package main

import (
	"context"
	"fmt"
//	"time"

// 	"github.com/nats-io/nats.go"
// 	"github.com/tamalsaha/nats-hop-demo/shared"
// 	"github.com/tamalsaha/nats-hop-demo/transport"
	core "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
//	"k8s.io/klog/v2"
	"k8s.io/klog/v2/klogr"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
)

func NewClient() (client.Client, error) {
	scheme := runtime.NewScheme()
	_ = clientgoscheme.AddToScheme(scheme)
	crdinstall.Install(scheme)

	ctrl.SetLogger(klogr.New())
	cfg := ctrl.GetConfigOrDie()
	cfg.QPS = 100
	cfg.Burst = 100

	mapper, err := apiutil.NewDynamicRESTMapper(cfg)
	if err != nil {
		return nil, err
	}

	return client.New(cfg, client.Options{
		Scheme: scheme,
		Mapper: mapper,
		//Opts: client.WarningHandlerOptions{
		//	SuppressWarnings:   false,
		//	AllowDuplicateLogs: false,
		//},
	})
}

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func main() {
	if err := run(); err != nil {
		panic(err)
	}
}

func run() error {
	_ = clientgoscheme.AddToScheme(scheme)

// 	nc, err := nats.Connect(shared.NATS_URL)
// 	if err != nil {
// 		klog.Fatalln(err)
// 	}
// 	defer nc.Close()

	ctrl.SetLogger(klogr.New())
	cfg := ctrl.GetConfigOrDie()

// 	tr, err := cfg.TransportConfig()
// 	if err != nil {
// 		panic(err)
// 	}
// 	cfg.Transport, err = transport.New(tr, nc, "k8s", 10000*time.Second)
// 	if err != nil {
// 		panic(err)
// 	}

	mapper, err := apiutil.NewDynamicRESTMapper(cfg)
	if err != nil {
		return err
	}

	c, err := client.New(cfg, client.Options{
		Scheme: scheme,
		Mapper: mapper,
		Opts: client.WarningHandlerOptions{
			SuppressWarnings:   false,
			AllowDuplicateLogs: false,
		},
	})
	if err != nil {
		return err
	}

	var nodes core.NodeList
	err = c.List(context.TODO(), &nodes)
	if err != nil {
		panic(err)
	}
	for _, n := range nodes.Items {
		fmt.Println(n.Name)
	}
	return nil
}

kubebuilder_forked_tools_makefile.sh

# Image URL to use all building/pushing image targets
IMG ?= controller:latest
# ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
ENVTEST_K8S_VERSION = 1.22

# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
ifeq (,$(shell go env GOBIN))
GOBIN=$(shell go env GOPATH)/bin
else
GOBIN=$(shell go env GOBIN)
endif

# Setting SHELL to bash allows bash commands to be executed by recipes.
# This is a requirement for 'setup-envtest.sh' in the test target.
# Options are set to exit when a recipe line exits non-zero or a piped command fails.
SHELL = /usr/bin/env bash -o pipefail
.SHELLFLAGS = -ec

.PHONY: all
all: build

##@ General

# The help target prints out all targets with their descriptions organized
# beneath their categories. The categories are represented by '##@' and the
# target descriptions by '##'. The awk commands is responsible for reading the
# entire set of makefiles included in this invocation, looking for lines of the
# file as xyz: ## something, and then pretty-format the target and help. Then,
# if there's a line with ##@ something, that gets pretty-printed as a category.
# More info on the usage of ANSI control characters for terminal formatting:
# https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters
# More info on the awk command:
# http://linuxcommand.org/lc3_adv_awk.php

.PHONY: help
help: ## Display this help.
	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)

##@ Development

.PHONY: manifests
manifests: controller-gen ## Generate WebhookConfiguration, ClusterRole and CustomResourceDefinition objects.
	$(CONTROLLER_GEN) rbac:roleName=manager-role crd:allowDangerousTypes=true webhook paths="./..." output:crd:artifacts:config=config/crd/bases

.PHONY: generate
generate: controller-gen ## Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations.
	$(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."

.PHONY: fmt
fmt: ## Run go fmt against code.
	go fmt ./...

.PHONY: vet
vet: ## Run go vet against code.
	go vet ./...

.PHONY: test
test: manifests generate fmt vet envtest ## Run tests.
	KUBEBUILDER_ASSETS="$(shell $(ENVTEST) use $(ENVTEST_K8S_VERSION) -p path)" go test ./... -coverprofile cover.out

##@ Build

.PHONY: build
build: generate fmt vet ## Build manager binary.
	go build -o bin/manager main.go

.PHONY: run
run: manifests generate fmt vet ## Run a controller from your host.
	go run ./main.go

.PHONY: docker-build
docker-build: test ## Build docker image with the manager.
	docker build -t ${IMG} .

.PHONY: docker-push
docker-push: ## Push docker image with the manager.
	docker push ${IMG}

##@ Deployment

ifndef ignore-not-found
  ignore-not-found = false
endif

.PHONY: install
install: manifests kustomize ## Install CRDs into the K8s cluster specified in ~/.kube/config.
	$(KUSTOMIZE) build config/crd | kubectl apply -f -

.PHONY: uninstall
uninstall: manifests kustomize ## Uninstall CRDs from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
	$(KUSTOMIZE) build config/crd | kubectl delete --ignore-not-found=$(ignore-not-found) -f -

.PHONY: deploy
deploy: manifests kustomize ## Deploy controller to the K8s cluster specified in ~/.kube/config.
	cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
	$(KUSTOMIZE) build config/default | kubectl apply -f -

.PHONY: undeploy
undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
	$(KUSTOMIZE) build config/default | kubectl delete --ignore-not-found=$(ignore-not-found) -f -

CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
.PHONY: controller-gen
controller-gen: ## Download controller-gen locally if necessary.
	$(call go-forked-tool,$(CONTROLLER_GEN),https://github.com/kmodules/controller-tools,v0.7.0-ac)

KUSTOMIZE = $(shell pwd)/bin/kustomize
.PHONY: kustomize
kustomize: ## Download kustomize locally if necessary.
	$(call go-get-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/[email protected])

ENVTEST = $(shell pwd)/bin/setup-envtest
.PHONY: envtest
envtest: ## Download envtest-setup locally if necessary.
	$(call go-get-tool,$(ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)

# go-get-tool will 'go get' any package $2 and install it to $1.
PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
define go-get-tool
@[ -f $(1) ] || { \
set -e ;\
TMP_DIR=$$(mktemp -d) ;\
cd $$TMP_DIR ;\
go mod init tmp ;\
echo "Downloading $(2)" ;\
GOBIN=$(PROJECT_DIR)/bin go get $(2) ;\
rm -rf $$TMP_DIR ;\
}
endef
define go-forked-tool
@[ -f $(1) ] || { \
set -e ;\
TMP_DIR=$$(mktemp -d) ;\
cd $$TMP_DIR ;\
echo "Cloning $(2)" ;\
git clone $(2); \
cd $$(ls -b1); \
git checkout $(3); \
GOBIN=$(PROJECT_DIR)/bin go install ./... ;\
rm -rf $$TMP_DIR ;\
}
endef

https://github.com/kubeform/module/commit/b1671ea774c2ae413a5af00528b85650f5e4085e