code restructuring as per typical golang projects (#397)

* code restructuring as per typical golang projects

* fix link in docs

Makefile

@@ -41,11 +41,11 @@ ifeq "$(BUILD_IN_DOCKER)" "true"
 	$(DOCKER) run -v $(PWD):/go/src/github.com/cloudnativelabs/kube-router -w /go/src/github.com/cloudnativelabs/kube-router $(DOCKER_BUILD_IMAGE) \
 	    sh -c ' \
 	    GOARCH=$(GOARCH) CGO_ENABLED=0 go build \
-		-ldflags "-X github.com/cloudnativelabs/kube-router/app.version=$(GIT_COMMIT) -X github.com/cloudnativelabs/kube-router/app.buildDate=$(BUILD_DATE)" \
-		-o kube-router kube-router.go'
+		-ldflags "-X github.com/cloudnativelabs/kube-router/pkg/cmd.version=$(GIT_COMMIT) -X github.com/cloudnativelabs/kube-router/pkg/cmd.buildDate=$(BUILD_DATE)" \
+		-o kube-router cmd/kube-router/kube-router.go'
 	@echo Finished kube-router binary build.
 else
-	GOARCH=$(GOARCH) CGO_ENABLED=0 go build -ldflags '-X github.com/cloudnativelabs/kube-router/app.version=$(GIT_COMMIT) -X github.com/cloudnativelabs/kube-router/app.buildDate=$(BUILD_DATE)' -o kube-router kube-router.go
+	GOARCH=$(GOARCH) CGO_ENABLED=0 go build -ldflags '-X github.com/cloudnativelabs/kube-router/pkg/cmd.version=$(GIT_COMMIT) -X github.com/cloudnativelabs/kube-router/pkg/cmd.buildDate=$(BUILD_DATE)' -o kube-router cmd/kube-router/kube-router.go
 endif
 
 test: gofmt gomoqs ## Runs code quality pipelines (gofmt, tests, coverage, lint, etc)
@@ -53,7 +53,7 @@ ifeq "$(BUILD_IN_DOCKER)" "true"
 	$(DOCKER) run -v $(PWD):/go/src/github.com/cloudnativelabs/kube-router -w /go/src/github.com/cloudnativelabs/kube-router $(DOCKER_BUILD_IMAGE) \
 	    sh -c 'go test github.com/cloudnativelabs/kube-router github.com/cloudnativelabs/kube-router/app/... github.com/cloudnativelabs/kube-router/utils/'
 else
-		go test github.com/cloudnativelabs/kube-router github.com/cloudnativelabs/kube-router/app/... github.com/cloudnativelabs/kube-router/utils/
+		go test github.com/cloudnativelabs/kube-router/cmd/kube-router/ github.com/cloudnativelabs/kube-router/pkg/...
 endif
 
 vagrant-up: export docker=$(DOCKER)
@@ -144,7 +144,7 @@ gofmt-fix: ## Fixes files that need to be gofmt'd.
 
 # List of all file_moq.go files which would need to be regenerated
 # from file.go if changed
-gomoqs: ./app/controllers/network_services_controller_moq.go
+gomoqs: ./pkg/controllers/network_services_controller_moq.go
 
 # file_moq.go file is generated from file.go "//go:generate moq ..." in-file
 # annotation, as it needs to know which interfaces to create mock stubs for

README.md

@@ -20,7 +20,7 @@ single DaemonSet/Binary. It doesn't get any easier.
 ### IPVS/LVS based service proxy | `--run-service-proxy`
 
 kube-router uses the Linux kernel's LVS/IPVS features to implement its K8s Services
-Proxy. Kube-router fully leverages power off LVS/IPVS to provide rich set of [scheduling options](/Documentation#load-balancing-scheduling-algorithms) and unique features like DSR (Direct Server Return), L3 load balancing with ECMP for deployments where high throughput, minimal latency and high-availability are crucial.
+Proxy. Kube-router fully leverages power off LVS/IPVS to provide rich set of [scheduling options](/docs#load-balancing-scheduling-algorithms) and unique features like DSR (Direct Server Return), L3 load balancing with ECMP for deployments where high throughput, minimal latency and high-availability are crucial.
 
 Read more about the advantages of IPVS for container load balancing:
 - [Kubernetes network services proxy with IPVS/LVS](https://cloudnativelabs.github.io/post/2017-05-10-kube-network-service-proxy/)
@@ -68,18 +68,18 @@ configured BGP peers. Kube-routes also support MD5 password based authentication
 uses strict export policies so you can be assured routes are advertised to underlay
 only as you intended.
 
-For more details please refer to the [BGP documentation](Documentation/bgp.md).
+For more details please refer to the [BGP documentation](docs/bgp.md).
 
 ### Standard Linux Networking
 
 A key design tenet of Kube-router is to use standard Linux networking stack and toolset. There is no overlays or 
 SDN pixie dust, but just plain good old networking. You can use standard Linux networking tools like iptables, ipvsadm, ipset,
-iproute, traceroute, tcpdump etc. to troubleshoot or observe data path. When kube-router is ran as a daemonset, image also ships with these [tools](./Documentation/pod-toolbox.md#pod-toolbox) automatically configured for your cluster.
+iproute, traceroute, tcpdump etc. to troubleshoot or observe data path. When kube-router is ran as a daemonset, image also ships with these [tools](./docs/pod-toolbox.md#pod-toolbox) automatically configured for your cluster.
 
 ### Small Footprint
 
 Although it does the work of several of its peers in one binary, kube-router
-does it all with a relatively [tiny codebase](https://github.com/cloudnativelabs/kube-router/tree/master/app/controllers), partly because IPVS is already
+does it all with a relatively [tiny codebase](https://github.com/cloudnativelabs/kube-router/tree/master/pkg/controllers), partly because IPVS is already
 there on your Kuberneres nodes waiting to help you do amazing things.
 kube-router brings that and GoBGP's modern BGP interface to you in an elegant
 package designed from the ground up for Kubernetes.
@@ -94,11 +94,11 @@ that has been thouroughly tested and optimized.
 
 ## Getting Started
 
-- [How it Works](./Documentation/how-it-works.md)
-- [Architecture](./Documentation/README.md#architecture)
-- [See Kube-router in action](./Documentation#see-kube-router-in-action)
-- [User Guide](./Documentation/README.md#user-guide)
-- [Developer Guide](./Documentation/developing.md)
+- [How it Works](./docs/how-it-works.md)
+- [Architecture](./docs/README.md#architecture)
+- [See Kube-router in action](./docs/README.md#see-kube-router-in-action)
+- [User Guide](./docs/README.md#user-guide)
+- [Developer Guide](./docs/developing.md)
 
 ## Project status
 

cmd/kube-router/kube-router.go

@@ -8,8 +8,8 @@ import (
 
 	_ "net/http/pprof"
 
-	"github.com/cloudnativelabs/kube-router/app"
-	"github.com/cloudnativelabs/kube-router/app/options"
+	"github.com/cloudnativelabs/kube-router/pkg/cmd"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
 	"github.com/spf13/pflag"
 )
 
@@ -39,7 +39,7 @@ func Main() error {
 	}
 
 	if config.Version {
-		app.PrintVersion(false)
+		cmd.PrintVersion(false)
 		return nil
 	}
 
@@ -48,11 +48,11 @@ func Main() error {
 	}
 
 	if config.CleanupConfig {
-		app.CleanupConfigAndExit()
+		cmd.CleanupConfigAndExit()
 		return nil
 	}
 
-	kubeRouter, err := app.NewKubeRouterDefault(config)
+	kubeRouter, err := cmd.NewKubeRouterDefault(config)
 	if err != nil {
 		return fmt.Errorf("Failed to parse kube-router config: %v", err)
 	}

cmd/kube-router/kube-router_test.go

@@ -32,9 +32,9 @@ func TestMainHelp(t *testing.T) {
 	stderrW.Close()
 	wg.Wait()
 
-	docF, err := os.Open("Documentation/README.md")
+	docF, err := os.Open("../../docs/README.md")
 	if err != nil {
-		t.Fatalf("could not open Documentation/README.md: %s\n", err)
+		t.Fatalf("could not open docs/README.md: %s\n", err)
 	}
 	docBuf := bytes.NewBuffer(nil)
 	docBuf.ReadFrom(docF)
@@ -44,6 +44,6 @@ func TestMainHelp(t *testing.T) {
 	exp = append(exp, []byte("```\n")...)
 
 	if !bytes.Contains(docBuf.Bytes(), exp) {
-		t.Errorf("Documentation/README.md 'command line options' section does not match `kube-router --help`.\nExpected:\n%s", exp)
+		t.Errorf("docs/README.md 'command line options' section does not match `kube-router --help`.\nExpected:\n%s", exp)
 	}
 }

docs/README.md

@@ -79,16 +79,16 @@ However BGP can be leveraged to other use cases like advertising the cluster ip,
 The best way to get started is to deploy Kubernetes with Kube-router is with a cluster installer.
 
 #### kops
-Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/Documentation/kops.md) to deploy Kubernetes cluster with Kube-router using [Kops](https://github.com/kubernetes/kops)
+Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/docs/kops.md) to deploy Kubernetes cluster with Kube-router using [Kops](https://github.com/kubernetes/kops)
 
 #### bootkube
 Please see the [steps](https://github.com/cloudnativelabs/kube-router/tree/master/contrib/bootkube) to deploy Kubernetes cluster with Kube-router using [bootkube](https://github.com/kubernetes-incubator/bootkube)
 
 #### kubeadm
-Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/Documentation/kubeadm.md) to deploy Kubernetes cluster with Kube-router using [Kubeadm](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/)
+Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/docs/kubeadm.md) to deploy Kubernetes cluster with Kube-router using [Kubeadm](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/)
 
 #### generic
-Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/Documentation/generic.md) to deploy kube-router on manually installed clusters
+Please see the [steps](https://github.com/cloudnativelabs/kube-router/blob/master/docs/generic.md) to deploy kube-router on manually installed clusters
 
 ### deployment
 

pkg/cmd/kube-router.go

@@ -1,4 +1,4 @@
-package app
+package cmd
 
 import (
 	"errors"
@@ -9,8 +9,8 @@ import (
 	"sync"
 	"syscall"
 
-	"github.com/cloudnativelabs/kube-router/app/controllers"
-	"github.com/cloudnativelabs/kube-router/app/options"
+	"github.com/cloudnativelabs/kube-router/pkg/controllers"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
 	"github.com/golang/glog"
 
 	"k8s.io/client-go/informers"

pkg/controllers/health_controller.go

@@ -6,7 +6,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/cloudnativelabs/kube-router/app/options"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
 	"github.com/golang/glog"
 	"golang.org/x/net/context"
 )

pkg/controllers/metrics_controller.go

@@ -7,7 +7,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/cloudnativelabs/kube-router/app/options"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
 	"github.com/golang/glog"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"

pkg/controllers/network_policy_controller.go

@@ -11,8 +11,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/cloudnativelabs/kube-router/app/options"
-	"github.com/cloudnativelabs/kube-router/utils"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
+	"github.com/cloudnativelabs/kube-router/pkg/utils"
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/golang/glog"
 	"github.com/prometheus/client_golang/prometheus"

pkg/controllers/network_routes_controller.go

@@ -19,8 +19,8 @@ import (
 	"github.com/aws/aws-sdk-go/aws/ec2metadata"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/ec2"
-	"github.com/cloudnativelabs/kube-router/app/options"
-	"github.com/cloudnativelabs/kube-router/utils"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
+	"github.com/cloudnativelabs/kube-router/pkg/utils"
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/golang/glog"
 	bgpapi "github.com/osrg/gobgp/api"

pkg/controllers/network_services_controller.go

@@ -18,8 +18,8 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/cloudnativelabs/kube-router/app/options"
-	"github.com/cloudnativelabs/kube-router/utils"
+	"github.com/cloudnativelabs/kube-router/pkg/options"
+	"github.com/cloudnativelabs/kube-router/pkg/utils"
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/docker/docker/client"
 	"github.com/docker/libnetwork/ipvs"