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package clusterprovider
import (
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"net"
"os"
"path/filepath"
"strconv"
discoveryv1 "k8s.io/api/discovery/v1"
"github.com/johnandersen777/socialweb-computer-kcp/internal/apiserverfront"
"github.com/johnandersen777/socialweb-computer-kcp/internal/clusterstack"
)
const (
FrontControlName = "front.sock"
FrontStateName = "front.json"
frontSocketDir = "fronts"
)
func FrontControlPath(stateDir, dataDir, cluster string) string {
p := filepath.Join(dataDir, FrontControlName)
if apiserverfront.CheckSocketPath(p) == nil {
return p
}
sum := sha256.Sum256([]byte(stateDir + "\x00" + cluster))
name := hex.EncodeToString(sum[:])[:16] + ".sock"
if run := os.Getenv("XDG_RUNTIME_DIR"); run != "" {
if q := filepath.Join(run, "swc", name); apiserverfront.CheckSocketPath(q) == nil {
return q
}
}
return filepath.Join(stateDir, frontSocketDir, name)
}
func FrontStatePath(dataDir string) string { return filepath.Join(dataDir, FrontStateName) }
func SlotBackend(spec clusterstack.Spec) string {
return net.JoinHostPort(spec.BindAddress, strconv.Itoa(spec.K3sSecurePort))
}
func waitFront(ctx context.Context, control string) error {
last := "no answer"
c := apiserverfront.Client{Path: control}
return poll(ctx, func(ctx context.Context) (bool, error) {
st, err := c.Status(ctx)
if err != nil {
last = err.Error()
return false, nil
}
if st.Address == "" {
last = "the front reported no listen address"
return false, nil
}
return true, nil
}, func() error { return &errNotReady{what: "the apiserver front at " + control, last: last} })
}
func (cfg StackConfig) waitSlotUp(ctx context.Context, spec clusterstack.Spec) error {
if err := waitK3s(ctx, spec.BindAddress, spec.K3sSecurePort); err != nil {
return err
}
return cfg.waitK3sControllers(ctx, spec.ServerAdminKubeconfig())
}
func (cfg StackConfig) WaitSlot(ctx context.Context, spec clusterstack.Spec) error {
if err := waitK3s(ctx, spec.BindAddress, spec.K3sSecurePort); err != nil {
return err
}
if err := cfg.waitK3sReadyz(ctx, spec.ServerAdminKubeconfig()); err != nil {
return err
}
return cfg.waitK3sControllers(ctx, spec.ServerAdminKubeconfig())
}
func (cfg StackConfig) CheckAdvertisedEndpoints(ctx context.Context, spec clusterstack.Spec) error {
core, err := cfg.open(spec.ServerAdminKubeconfig(), OpenOptions{Throughput: true})
if err != nil {
return err
}
want := net.JoinHostPort(spec.AdvertiseAddress, strconv.Itoa(spec.AdvertisePort))
last := "no answer"
err = core.AwaitAPIServerSlices(ctx, 0, func(slices []*discoveryv1.EndpointSlice) (bool, error) {
got := endpointsOf(slices)
if len(got) == 1 && got[0] == want {
return true, nil
}
last = fmt.Sprintf("the kubernetes EndpointSlice names %v", got)
return false, nil
})
if err != nil && ctx.Err() != nil {
return &errNotReady{what: "the kubernetes EndpointSlice of " + spec.Cluster + " naming only " + want +
", the advertise address and the front port; a slot listen port there is a port a guest cannot reach after the next swap",
last: last}
}
return err
}
func AdvertisedEndpoints(ctx context.Context, core Tenant) ([]string, error) {
list, err := core.APIServerSlices(ctx)
if err != nil {
return nil, err
}
items := make([]*discoveryv1.EndpointSlice, 0, len(list))
for i := range list {
items = append(items, &list[i])
}
return endpointsOf(items), nil
}
func endpointsOf(slices []*discoveryv1.EndpointSlice) []string {
seen := map[string]bool{}
var out []string
for _, s := range slices {
for _, p := range s.Ports {
if p.Port == nil {
continue
}
for _, e := range s.Endpoints {
for _, a := range e.Addresses {
hp := net.JoinHostPort(a, strconv.Itoa(int(*p.Port)))
if !seen[hp] {
seen[hp] = true
out = append(out, hp)
}
}
}
}
}
return out
}
