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install.go
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/
install.go
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package kubernetes
import (
"bytes"
"fmt"
"strings"
"text/template"
"github.com/Masterminds/sprig"
"github.com/pkg/errors"
"github.com/rhysd/go-fakeio"
log "github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/discovery"
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
cmdapply "k8s.io/kubernetes/pkg/kubectl/cmd/apply"
kubecommon "github.com/starofservice/carbon/pkg/kubernetes/common"
"github.com/starofservice/carbon/pkg/util/tojson"
)
func (self *KubeInstall) UpdateVars(vars map[string]string) {
log.Debug("Applying Carbon variables")
for k, v := range vars {
log.Tracef("%s: %s", k, v)
if _, ok := self.Variables.Var[k]; ok {
self.Variables.Var[k] = v
} else {
log.Debugf("Variable '%s' is defined, but it isn't supported by the current package", k)
}
}
}
func (self *KubeInstall) Build() error {
log.Debug("Building Kubernetes manifest based on the template from the package and provided variables")
tpl, err := template.New("kubeManifest").Option("missingkey=zero").Funcs(sprig.TxtFuncMap()).Parse(string(self.RawManifest))
if err != nil {
return errors.Wrap(err, "parsing Kubernetes manifests teamplate")
}
buf := &bytes.Buffer{}
err = tpl.Execute(buf, self.Variables)
if err != nil {
return errors.Wrap(err, "building Kubernetes manifests")
}
self.BuiltManifest, err = tojson.ToJSON(buf.Bytes())
if err != nil {
return errors.Wrap(err, "converting Kubernetes manifests to JSON")
}
return nil
}
func (self *KubeInstall) SetAppLabels() error {
log.Debug("Applying Carbon lables for Kubernetes manifests")
var ops string
if self.Scope == "cluster" {
ops = self.clusterScopeLabelsPatch()
} else if self.Scope == "namespace" {
ops = self.nsScopeLabelsPatch()
}
patch, err := tojson.ToJSON([]byte(ops))
if err != nil {
log.Error("Most likely it's a bug of the Carbon tool. Please, create an issue for us and provide all possible details.")
return errors.Wrap(err, "converting Kubernetes patch with Carbon labels to JSON")
}
if err := self.ProcessPatches(patch); err != nil {
return err
}
return nil
}
func (self *KubeInstall) clusterScopeLabelsPatch() string {
ops := fmt.Sprintf(`---
filters:
kind: .*
type: merge
patch:
metadata:
labels:
managed-by: carbon
carbon/component-name: %s
carbon/component-version: %s
`, self.Variables.Pkg.Name, self.Variables.Pkg.Version)
return ops
}
func (self *KubeInstall) nsScopeLabelsPatch() string {
ops := fmt.Sprintf(`---
filters:
kind: .*
type: merge
patch:
metadata:
labels:
managed-by: carbon
carbon/component-name: %s
carbon/component-version: %s
carbon/component-namespace: %s
`, self.Variables.Pkg.Name, self.Variables.Pkg.Version, kubecommon.CurrentNamespace)
return ops
}
func (self *KubeInstall) Apply(defPWL bool) error {
log.Debug("Applying Kubernetes manifests")
f, ioStreams := kubecommon.KubeCmdFactory(kubecommon.CurrentNamespace)
cmd := cmdapply.NewCmdApply("kubectl", f, ioStreams)
o := cmdapply.NewApplyOptions(ioStreams)
err := o.Complete(f, cmd)
if err != nil {
return err
}
o.DeleteOptions.FilenameOptions.Filenames = []string{"-"}
o.Prune = true
force := true
o.DeleteFlags.Force = &force
var selector string
if self.Scope == "cluster" {
selector = fmt.Sprintf("carbon/component-name=%s", self.Variables.Pkg.Name)
} else if self.Scope == "namespace" {
selector = fmt.Sprintf("carbon/component-name=%s,carbon/component-namespace=%s",
self.Variables.Pkg.Name, kubecommon.CurrentNamespace)
}
o.Selector = selector
if !defPWL {
allRes, err := GetAllResources()
if err == nil {
for _, i := range allRes {
o.PruneWhitelist = append(o.PruneWhitelist, i)
}
} else {
log.Warn("I'm unable to discover Kubernetes resources for prune operation. So I'll be using the default prune-whitelist from kubectl apply")
}
}
o.Namespace = kubecommon.CurrentNamespace
// o.EnforceNamespace = true
if self.Scope == "cluster" {
o.EnforceNamespace = false
} else if self.Scope == "namespace" {
o.EnforceNamespace = true
}
log.Trace("Final Kubernetes manifests for being applied: ", string(self.BuiltManifest))
fake := fakeio.StdinBytes([]byte{})
defer fake.Restore()
go func() {
fake.StdinBytes(self.BuiltManifest)
fake.CloseStdin()
}()
err = o.Run()
if err != nil {
msg := err.Error()
msg = strings.Replace(msg, `error validating "STDIN": `, "", -1)
msg = strings.Replace(msg, `; if you choose to ignore these errors, turn validation off with --validate=false`, "", -1)
return errors.Errorf(msg)
}
return nil
}
func GetAllResources() ([]string, error) {
kubeConfig, err := kubecommon.KubeConfig()
if err != nil {
log.Debugf("Failed to discover location of kubeconfig due to the error: %s", err.Error())
return nil, err
}
discClient, err := discovery.NewDiscoveryClientForConfig(kubeConfig)
if err != nil {
log.Debugf("Failed to create Kubernetes discovery handler due to the error: %s", err.Error())
return nil, err
}
apiResList, err := discClient.ServerResources()
if err != nil {
log.Debugf("Failed to receive Kubernetes server resources due to the error: %s", err.Error())
return nil, err
}
return procAPIResList(apiResList), nil
}
func procAPIResList (apiResList []*metav1.APIResourceList) []string {
crdResMap := make(map[string]struct{})
genResMap := make(map[string]struct{})
for _, rl := range apiResList {
groupVersion := rl.GroupVersion
if len(strings.Split(groupVersion, "/")) == 1 {
groupVersion = "/" + groupVersion
}
for _, rh := range rl.APIResources {
if skipResource(rh.Kind) {
continue
}
r := fmt.Sprintf("%s/%s", groupVersion, rh.Kind)
// if skipVersionedResource(r) {
// continue
// }
if rh.Kind == "CustomResourceDefinition" {
crdResMap[r] = struct{}{}
} else {
genResMap[r] = struct{}{}
}
}
}
var resources []string
for k := range genResMap {
resources = append(resources, k)
}
// CRDs must be checked at a very last order
for k := range crdResMap {
resources = append(resources, k)
}
return resources
}
func skipResource(res string) bool {
skipRes := []string{
"AdmissionReview",
"Binding",
"ComponentStatus",
"ControllerRevision",
"DeploymentRollback",
"Event",
"Eviction",
"ExternalMetricValueList",
"LocalSubjectAccessReview",
"NodeProxyOptions",
"PodAttachOptions",
"PodExecOptions",
"PodPortForwardOptions",
"PodProxyOptions",
"PodTemplate",
"ReplicationControllerDummy",
"Scale",
"SelfSubjectAccessReview",
"SelfSubjectRulesReview",
"ServiceProxyOptions",
"SubjectAccessReview",
"TokenRequest",
"TokenReview",
"VolumeAttachment",
}
for _, i := range skipRes {
if res == i {
return true
}
}
return false
}
// It doesn't reduce processing time significantly.
// So I prefer to keep these versions for compatibility
// with old Kubernetes versions
// func skipVersionedResource(res string) bool {
// skipRes := []string{
// "extensions/v1beta1/PodSecurityPolicy",
// "extensions/v1beta1/NetworkPolicy",
// "extensions/v1beta1/Deployment",
// "extensions/v1beta1/DaemonSet",
// "extensions/v1beta1/ReplicaSet",
// "apps/v1beta1/Deployment",
// "apps/v1beta2/Deployment",
// "storage.k8s.io/v1beta1/StorageClass",
// "apiregistration.k8s.io/v1beta1/APIService",
// "autoscaling/v2beta1/HorizontalPodAutoscaler",
// "apps/v1beta2/DaemonSet",
// "apps/v1beta2/ReplicaSet",
// "apps/v1beta1/StatefulSet",
// "apps/v1beta2/StatefulSet",
// }
// for _, i := range skipRes {
// if res == i {
// return true
// }
// }
// return false
// }