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manager.go
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manager.go
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package resource
import (
"context"
"fmt"
"github.com/go-logr/logr"
"github.com/tiny-systems/module/api/v1alpha1"
"github.com/tiny-systems/module/module"
"github.com/tiny-systems/module/pkg/utils"
v1core "k8s.io/api/core/v1"
v1ingress "k8s.io/api/networking/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/util/intstr"
"strings"
"os"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type Manager struct {
client client.Client
namespace string
log logr.Logger
}
type ManagerInterface interface {
CleanupExampleNodes(ctx context.Context, mod module.Info) error
RegisterModule(ctx context.Context, mod module.Info) error
ExposePort(ctx context.Context, autoHostName string, hostnames []string, port int) ([]string, error)
DisclosePort(ctx context.Context, port int) error
RegisterExampleNode(ctx context.Context, c module.Component, mod module.Info) error
CreateClusterNodeSignal(ctx context.Context, node v1alpha1.TinyNode, port string, data []byte) error
}
func NewManager(c client.Client, log logr.Logger, ns string) *Manager {
return &Manager{client: c, log: log, namespace: ns}
}
// CleanupExampleNodes @todo deal with it later
func (m Manager) CleanupExampleNodes(ctx context.Context, mod module.Info) error {
sel := labels.NewSelector()
req, err := labels.NewRequirement(v1alpha1.FlowIDLabel, selection.Equals, []string{""})
if err != nil {
return err
}
sel = sel.Add(*req)
req, err = labels.NewRequirement(v1alpha1.ModuleNameMajorLabel, selection.Equals, []string{mod.GetMajorNameSanitised()})
if err != nil {
return err
}
sel = sel.Add(*req)
req, err = labels.NewRequirement(v1alpha1.ModuleVersionLabel, selection.NotEquals, []string{mod.Version})
if err != nil {
return err
}
sel = sel.Add(*req)
return m.client.DeleteAllOf(ctx, &v1alpha1.TinyNode{}, client.InNamespace(m.namespace), client.MatchingLabelsSelector{
Selector: sel,
})
return nil
}
func (m Manager) RegisterModule(ctx context.Context, mod module.Info) error {
spec := v1alpha1.TinyModuleSpec{
Image: mod.GetNameAndVersion(),
}
node := &v1alpha1.TinyModule{
ObjectMeta: metav1.ObjectMeta{
Namespace: m.namespace, // @todo make dynamic
Name: mod.GetMajorNameSanitised(),
Labels: map[string]string{
// v1alpha1.ModuleNameLabel: mod.Name,
},
Annotations: map[string]string{},
},
Spec: spec,
}
err := m.client.Create(ctx, node)
if errors.IsAlreadyExists(err) {
return nil
}
return err
}
func (m Manager) getReleaseNameByPodName(ctx context.Context, podName string) (string, error) {
pod := &v1core.Pod{}
err := m.client.Get(context.Background(), client.ObjectKey{
Namespace: m.namespace,
Name: podName,
}, pod)
if err != nil {
return "", fmt.Errorf("unable to find current pod: %v", err)
}
var releaseName string
for k, v := range pod.ObjectMeta.Labels {
if k == "app.kubernetes.io/instance" {
releaseName = v
}
}
if releaseName == "" {
return "", fmt.Errorf("release name label not found")
}
return releaseName, nil
}
func (m Manager) ExposePort(ctx context.Context, autoHostName string, hostnames []string, port int) ([]string, error) {
m.log.Info("exposing port", "port", port, "hostnames", hostnames)
currentPod := os.Getenv("HOSTNAME")
if currentPod == "" {
return []string{}, fmt.Errorf("unable to determine the current pod's name")
}
if hostnames == nil {
hostnames = []string{}
}
if len(hostnames) == 0 && autoHostName == "" {
return []string{}, fmt.Errorf("empty hostnames provided")
}
releaseName, err := m.getReleaseNameByPodName(ctx, currentPod)
if err != nil {
return nil, fmt.Errorf("unable to find release name: %v", err)
}
svc, err := m.getReleaseService(ctx, releaseName)
if err != nil {
return []string{}, fmt.Errorf("unable to get service: %v", err)
}
ingress, _ := m.getReleaseIngress(ctx, releaseName)
if ingress == nil {
return []string{}, fmt.Errorf("no ingress")
}
if err = m.exposeServicePort(ctx, svc, port); err != nil {
return []string{}, err
}
prefix := m.getIngressAutoHostnamePrefix(ctx, ingress)
if prefix != "" && autoHostName != "" {
hostnames = append(hostnames, fmt.Sprintf("%s-%s%s", autoHostName, svc.Namespace, prefix))
}
return m.addRulesIngress(ctx, ingress, svc, hostnames, port)
}
func (m Manager) getIngressAutoHostnamePrefix(ctx context.Context, ingress *v1ingress.Ingress) string {
var hostNamePrefix string
for k, v := range ingress.Annotations {
if k == v1alpha1.IngressHostNameSuffixAnnotation {
hostNamePrefix = v
}
}
return hostNamePrefix
}
func (m Manager) removeRulesIngress(ctx context.Context, ingress *v1ingress.Ingress, service *v1core.Service, port int) error {
var (
rules []v1ingress.IngressRule
tls []v1ingress.IngressTLS
deletedHostnames []string
)
RULES:
for _, rule := range ingress.Spec.Rules {
if rule.IngressRuleValue.HTTP == nil {
continue
}
for _, p := range rule.IngressRuleValue.HTTP.Paths {
if p.Backend.Service.Port.Number == int32(port) && p.Backend.Service.Name == service.Name {
// omit saving
deletedHostnames = append(deletedHostnames, rule.Host)
continue RULES
}
rules = append(rules, rule)
}
}
TLS:
for _, t := range tls {
for _, h := range t.Hosts {
for _, host := range deletedHostnames {
if host != h {
tls = append(tls, t)
continue
}
continue TLS
}
}
}
ingress.Spec.TLS = tls
ingress.Spec.Rules = rules
return m.client.Update(ctx, ingress)
}
func (m Manager) addRulesIngress(ctx context.Context, ingress *v1ingress.Ingress, service *v1core.Service, hostnames []string, port int) ([]string, error) {
if len(hostnames) == 0 {
return []string{}, fmt.Errorf("no hostnames provided")
}
pathType := v1ingress.PathTypePrefix
var rule = v1ingress.IngressRuleValue{
HTTP: &v1ingress.HTTPIngressRuleValue{
Paths: []v1ingress.HTTPIngressPath{
{
Path: "/",
PathType: &pathType,
Backend: v1ingress.IngressBackend{
Service: &v1ingress.IngressServiceBackend{
Name: service.Name,
Port: v1ingress.ServiceBackendPort{
Number: int32(port),
},
},
},
},
},
},
}
INGRESS:
for _, hostname := range hostnames {
for idx, r := range ingress.Spec.Rules {
if r.Host != hostname {
continue
}
ingress.Spec.Rules[idx].IngressRuleValue = rule
continue INGRESS
}
ingress.Spec.Rules = append(ingress.Spec.Rules, v1ingress.IngressRule{
Host: hostname,
IngressRuleValue: rule,
})
}
var newHostNames []string
HOSTNAMES:
for _, hostname := range hostnames {
for _, t := range ingress.Spec.TLS {
for _, th := range t.Hosts {
if th != hostname {
continue
}
continue HOSTNAMES
}
}
newHostNames = append(newHostNames, hostname)
}
if len(newHostNames) > 0 {
for _, hostname := range newHostNames {
ingress.Spec.TLS = append(ingress.Spec.TLS, v1ingress.IngressTLS{
Hosts: []string{hostname},
SecretName: fmt.Sprintf("%s-tls", hostname),
})
}
}
if err := m.client.Update(ctx, ingress); err != nil {
return []string{}, err
}
return hostnames, nil
}
func (m Manager) discloseServicePort(ctx context.Context, svc *v1core.Service, port int) error {
var ports []v1core.ServicePort
for _, p := range svc.Spec.Ports {
if p.Port == int32(port) {
continue
}
// save others
ports = append(ports, p)
}
svc.Spec.Ports = ports
return m.client.Update(ctx, svc)
}
func (m Manager) exposeServicePort(ctx context.Context, svc *v1core.Service, port int) error {
for _, p := range svc.Spec.Ports {
if p.Port == int32(port) {
// service has port already exposed
return nil
}
}
svc.Spec.Ports = append(svc.Spec.Ports, v1core.ServicePort{
Name: fmt.Sprintf("port%d", port),
Port: int32(port),
TargetPort: intstr.FromInt32(int32(port)),
})
return m.client.Update(ctx, svc)
}
func (m Manager) getReleaseService(ctx context.Context, releaseName string) (*v1core.Service, error) {
servicesList := &v1core.ServiceList{}
selector, err := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
MatchLabels: map[string]string{
"app.kubernetes.io/instance": releaseName,
"app.kubernetes.io/name": "tinysystems-operator",
"app.kubernetes.io/component": "manager",
},
})
if err != nil {
return nil, fmt.Errorf("build service selector error: %s", err)
}
if err = m.client.List(ctx, servicesList, client.MatchingLabelsSelector{
Selector: selector,
}, client.InNamespace(m.namespace)); err != nil {
return nil, fmt.Errorf("service list error: %v", err)
}
if len(servicesList.Items) == 0 {
return nil, fmt.Errorf("unable to find manager service")
}
if len(servicesList.Items) > 1 {
return nil, fmt.Errorf("service is ambigous")
}
return &servicesList.Items[0], nil
}
func (m Manager) getReleaseIngress(ctx context.Context, releaseName string) (*v1ingress.Ingress, error) {
ingressList := &v1ingress.IngressList{}
selector, err := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
MatchLabels: map[string]string{
"app.kubernetes.io/instance": releaseName,
"app.kubernetes.io/name": "tinysystems-operator",
},
})
if err != nil {
return nil, fmt.Errorf("build ingress selector error: %s", err)
}
if err = m.client.List(ctx, ingressList, client.MatchingLabelsSelector{
Selector: selector,
}, client.InNamespace(m.namespace)); err != nil {
return nil, fmt.Errorf("service list error: %v", err)
}
if len(ingressList.Items) == 0 {
return nil, fmt.Errorf("unable to find manager ingress")
}
if len(ingressList.Items) > 1 {
return nil, fmt.Errorf("ingress is ambigous")
}
return &ingressList.Items[0], nil
}
func (m Manager) DisclosePort(ctx context.Context, port int) error {
m.log.Info("disclose port", "port", port)
currentPod := os.Getenv("HOSTNAME")
if currentPod == "" {
return fmt.Errorf("unable to determine the current pod's name")
}
releaseName, err := m.getReleaseNameByPodName(ctx, currentPod)
if err != nil {
return fmt.Errorf("unable to find release name: %v", err)
}
svc, err := m.getReleaseService(ctx, releaseName)
if err != nil {
return fmt.Errorf("unable to get service: %v", err)
}
ingress, _ := m.getReleaseIngress(ctx, releaseName)
if ingress == nil {
return fmt.Errorf("no ingress")
}
if err = m.discloseServicePort(ctx, svc, port); err != nil {
return err
}
return m.removeRulesIngress(ctx, ingress, svc, port)
}
func (m Manager) CreateClusterNodeSignal(ctx context.Context, node v1alpha1.TinyNode, port string, data []byte) error {
signal := &v1alpha1.TinySignal{
Spec: v1alpha1.TinySignalSpec{
Node: node.Name,
Port: port,
Data: data,
},
}
signal.Namespace = node.Namespace
signal.GenerateName = fmt.Sprintf("%s-%s-", node.Name, strings.ReplaceAll(port, "_", ""))
return m.client.Create(ctx, signal)
}
func (m Manager) RegisterExampleNode(ctx context.Context, c module.Component, mod module.Info) error {
componentInfo := c.GetInfo()
node := &v1alpha1.TinyNode{
ObjectMeta: metav1.ObjectMeta{
Namespace: m.namespace, // @todo make dynamic
Name: module.GetNodeFullName("00000000", mod.GetMajorNameSanitised(), componentInfo.GetResourceName()),
Labels: map[string]string{
v1alpha1.FlowIDLabel: "", //<-- empty flow means that's a node for palette
v1alpha1.ModuleNameMajorLabel: mod.GetMajorNameSanitised(),
v1alpha1.ModuleVersionLabel: mod.Version,
},
},
Spec: v1alpha1.TinyNodeSpec{
Module: mod.GetMajorNameSanitised(),
Component: utils.SanitizeResourceName(c.GetInfo().Name),
},
}
err := m.client.Create(ctx, node)
if errors.IsAlreadyExists(err) {
return nil
}
return err
}
func (m Manager) Start(ctx context.Context) error {
<-ctx.Done()
return nil
}