493 lines
16 KiB
Go
493 lines
16 KiB
Go
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// Package sessions — SandboxManager provisions per-session k8s resources:
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//
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// PVC workspace-session-<uuid> Longhorn 1Gi
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// Pod pi-session-<uuid> single container, /workspace <- PVC
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// Svc pi-session-<uuid> ClusterIP :8787
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// NetPol pi-session-sandbox shared for all pi-session pods (created once)
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//
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// All k8s API calls use raw HTTP + in-cluster SA token (no client-go).
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// Same pattern as internal/webhook/promoter.go.
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package sessions
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import (
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"bytes"
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"strings"
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"time"
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)
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const (
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sandboxNamespace = "poimen"
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sandboxImage = "forgejo.riotpiao.com/riotpiao-poimen/poimen-pi-session-runtime:latest"
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sandboxPort = 8787
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defaultPVCSize = "1Gi"
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defaultStorageClass = "longhorn"
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defaultReadyTimeout = 30 * time.Second
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defaultReaperInterval = 5 * time.Minute
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sandboxSATokenPath = "/var/run/secrets/kubernetes.io/serviceaccount/token"
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sandboxCACertPath = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
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)
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// SandboxManager manages the k8s lifecycle of pi-session Pods, PVCs, Services.
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type SandboxManager struct {
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k8sHost string
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k8sClient *http.Client
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pvcSize string
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readyTimeout time.Duration
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}
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// SandboxResult is returned by CreateOrResume.
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type SandboxResult struct {
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SessionID string `json:"session_id"`
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PodName string `json:"pod_name"`
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PVCName string `json:"pvc_name"`
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SvcDNS string `json:"svc_dns"`
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Resumed bool `json:"resumed"` // true = pod already existed
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}
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// NewSandboxManager creates a SandboxManager from env + in-cluster SA files.
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func NewSandboxManager() *SandboxManager {
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host := os.Getenv("K8S_API_HOST")
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if host == "" {
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host = "https://kubernetes.default.svc"
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}
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pvcSize := os.Getenv("SANDBOX_PVC_SIZE")
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if pvcSize == "" {
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pvcSize = defaultPVCSize
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}
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caCert, _ := os.ReadFile(sandboxCACertPath)
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return &SandboxManager{
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k8sHost: host,
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k8sClient: buildSandboxK8sClient(caCert),
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pvcSize: pvcSize,
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readyTimeout: defaultReadyTimeout,
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}
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}
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func buildSandboxK8sClient(caCert []byte) *http.Client {
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transport := &http.Transport{}
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if len(caCert) > 0 {
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pool := x509.NewCertPool()
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pool.AppendCertsFromPEM(caCert)
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transport.TLSClientConfig = &tls.Config{RootCAs: pool}
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} else {
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log.Printf("sandbox: WARNING no SA CA cert at %s — using InsecureSkipVerify", sandboxCACertPath)
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transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true} //nolint:gosec
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}
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return &http.Client{Timeout: 30 * time.Second, Transport: transport}
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}
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func sandboxSAToken() string {
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b, err := os.ReadFile(sandboxSATokenPath)
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if err != nil {
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log.Printf("sandbox: WARNING failed to read SA token %s: %v", sandboxSATokenPath, err)
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return ""
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}
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return strings.TrimSpace(string(b))
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}
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func pvcName(sessionID string) string { return "workspace-session-" + sessionID }
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func podName(sessionID string) string { return "pi-session-" + sessionID }
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func svcName(sessionID string) string { return "pi-session-" + sessionID }
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func svcDNS(sessionID string) string {
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return fmt.Sprintf("%s.%s.svc.cluster.local:%d", svcName(sessionID), sandboxNamespace, sandboxPort)
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}
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// ── public API ────────────────────────────────────────────────────────────
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// CreateOrResume provisions or resumes a sandbox for sessionID.
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// Idempotent: if the pod is already Running, returns its DNS immediately.
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func (s *SandboxManager) CreateOrResume(ctx context.Context, sessionID string) (*SandboxResult, error) {
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res := &SandboxResult{
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SessionID: sessionID,
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PodName: podName(sessionID),
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PVCName: pvcName(sessionID),
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SvcDNS: svcDNS(sessionID),
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}
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// 1. Ensure PVC exists
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if err := s.ensurePVC(ctx, sessionID); err != nil {
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return nil, fmt.Errorf("ensure PVC: %w", err)
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}
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// 2. Check if pod already running (resume case)
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phase, err := s.getPodPhase(ctx, sessionID)
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if err != nil {
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return nil, fmt.Errorf("check pod: %w", err)
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}
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if phase == "Running" {
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res.Resumed = true
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return res, nil
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}
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// 3. Ensure NetworkPolicy for all pi-session pods exists
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if err := s.ensureNetworkPolicy(ctx); err != nil {
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log.Printf("sandbox: WARNING failed to ensure network policy: %v", err)
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}
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// 4. Create Pod + Service
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if err := s.createPod(ctx, sessionID); err != nil {
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return nil, fmt.Errorf("create pod: %w", err)
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}
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if err := s.ensureService(ctx, sessionID); err != nil {
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return nil, fmt.Errorf("ensure service: %w", err)
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}
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// 5. Wait for Ready
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if err := s.waitPodReady(ctx, sessionID); err != nil {
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return nil, fmt.Errorf("wait ready: %w", err)
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}
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return res, nil
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}
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// Delete removes the Pod, Service, and PVC for sessionID.
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func (s *SandboxManager) Delete(ctx context.Context, sessionID string) error {
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var errs []string
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for _, fn := range []func(context.Context, string) error{
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s.deletePod, s.deleteService, s.deletePVC,
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} {
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if err := fn(ctx, sessionID); err != nil && !isNotFound(err) {
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errs = append(errs, err.Error())
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}
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}
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if len(errs) > 0 {
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return fmt.Errorf("delete sandbox: %s", strings.Join(errs, "; "))
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}
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return nil
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}
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// ReapIdlePods lists all pi-session-* pods and deletes those that have exited
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// (Succeeded/Failed) — bridge.js self-exits after idle timeout.
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// The PVC is preserved so the next CreateOrResume reattaches the same workspace.
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func (s *SandboxManager) ReapIdlePods(ctx context.Context) {
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pods, err := s.listSandboxPods(ctx)
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if err != nil {
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log.Printf("sandbox reaper: list pods: %v", err)
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return
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}
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for _, podAny := range pods {
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pod, _ := podAny.(map[string]any)
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phase, _ := pod["status"].(map[string]any)["phase"].(string)
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name, _ := pod["metadata"].(map[string]any)["name"].(string)
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if phase == "Succeeded" || phase == "Failed" {
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log.Printf("sandbox reaper: deleting exited pod %s (phase=%s)", name, phase)
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if err := s.k8sDelete(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods/"+name); err != nil && !isNotFound(err) {
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log.Printf("sandbox reaper: delete pod %s: %v", name, err)
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}
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}
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}
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}
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// ── k8s resource helpers ─────────────────────────────────────────────────
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func (s *SandboxManager) ensurePVC(ctx context.Context, sessionID string) error {
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name := pvcName(sessionID)
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_, err := s.k8sGet(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/persistentvolumeclaims/"+name)
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if err == nil {
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return nil // already exists
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}
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if !isNotFound(err) {
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return err
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}
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// Create
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body := map[string]any{
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"apiVersion": "v1",
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"kind": "PersistentVolumeClaim",
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"metadata": map[string]any{
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"name": name, "namespace": sandboxNamespace,
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"labels": map[string]string{"app": "pi-session", "session-id": sessionID},
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},
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"spec": map[string]any{
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"accessModes": []string{"ReadWriteOnce"},
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"storageClassName": defaultStorageClass,
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"resources": map[string]any{
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"requests": map[string]string{"storage": s.pvcSize},
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},
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},
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}
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return s.k8sCreate(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/persistentvolumeclaims", body)
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}
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func (s *SandboxManager) getPodPhase(ctx context.Context, sessionID string) (string, error) {
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pod, err := s.k8sGet(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods/"+podName(sessionID))
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if isNotFound(err) {
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return "", nil
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}
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if err != nil {
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return "", err
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}
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phase, _ := pod["status"].(map[string]any)["phase"].(string)
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return phase, nil
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}
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func (s *SandboxManager) createPod(ctx context.Context, sessionID string) error {
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body := map[string]any{
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"apiVersion": "v1",
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"kind": "Pod",
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"metadata": map[string]any{
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"name": podName(sessionID), "namespace": sandboxNamespace,
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"labels": map[string]string{"app": "pi-session", "session-id": sessionID},
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},
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"spec": map[string]any{
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"restartPolicy": "Never",
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"automountServiceAccountToken": false,
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"securityContext": map[string]any{
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"runAsNonRoot": true,
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"runAsUser": int64(1000),
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"seccompProfile": map[string]string{"type": "RuntimeDefault"},
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},
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"containers": []map[string]any{{
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"name": "pi-session",
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"image": sandboxImage,
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"ports": []map[string]any{{"containerPort": sandboxPort}},
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"securityContext": map[string]any{
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"readOnlyRootFilesystem": true,
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"allowPrivilegeEscalation": false,
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"capabilities": map[string]any{"drop": []string{"ALL"}},
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},
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"resources": map[string]any{
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"requests": map[string]string{"cpu": "500m", "memory": "512Mi"},
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"limits": map[string]string{"cpu": "1", "memory": "1Gi"},
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},
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"readinessProbe": map[string]any{
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"tcpSocket": map[string]any{"port": sandboxPort},
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"initialDelaySeconds": 3,
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"periodSeconds": 2,
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"failureThreshold": 15,
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},
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"volumeMounts": []map[string]any{
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{"name": "workspace", "mountPath": "/workspace"},
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{"name": "tmp", "mountPath": "/tmp"},
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},
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}},
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"volumes": []map[string]any{
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{"name": "workspace", "persistentVolumeClaim": map[string]string{"claimName": pvcName(sessionID)}},
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{"name": "tmp", "emptyDir": map[string]any{}},
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},
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},
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}
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return s.k8sCreate(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods", body)
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}
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func (s *SandboxManager) ensureService(ctx context.Context, sessionID string) error {
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name := svcName(sessionID)
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_, err := s.k8sGet(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/services/"+name)
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if err == nil {
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return nil
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}
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if !isNotFound(err) {
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return err
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}
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body := map[string]any{
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"apiVersion": "v1",
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"kind": "Service",
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"metadata": map[string]any{
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"name": name, "namespace": sandboxNamespace,
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"labels": map[string]string{"app": "pi-session", "session-id": sessionID},
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},
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"spec": map[string]any{
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"type": "ClusterIP",
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"selector": map[string]string{"app": "pi-session", "session-id": sessionID},
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"ports": []map[string]any{{
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"port": sandboxPort, "targetPort": sandboxPort, "protocol": "TCP",
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}},
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},
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}
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return s.k8sCreate(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/services", body)
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}
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func (s *SandboxManager) ensureNetworkPolicy(ctx context.Context) error {
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const npName = "pi-session-sandbox"
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_, err := s.k8sGet(ctx, "/apis/networking.k8s.io/v1/namespaces/"+sandboxNamespace+"/networkpolicies/"+npName)
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if err == nil {
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return nil // already exists
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}
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if !isNotFound(err) {
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return err
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}
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body := map[string]any{
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"apiVersion": "networking.k8s.io/v1",
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"kind": "NetworkPolicy",
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"metadata": map[string]any{
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"name": npName, "namespace": sandboxNamespace,
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"labels": map[string]string{"app": "pi-session"},
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},
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"spec": map[string]any{
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"podSelector": map[string]any{"matchLabels": map[string]string{"app": "pi-session"}},
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"policyTypes": []string{"Ingress", "Egress"},
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"ingress": []map[string]any{{
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"from": []map[string]any{{
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"podSelector": map[string]any{"matchLabels": map[string]string{"app": "poimen-frontend"}},
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}},
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"ports": []map[string]any{{"protocol": "TCP", "port": sandboxPort}},
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}},
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"egress": []map[string]any{
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// DNS
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{
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"to": []map[string]any{{"namespaceSelector": map[string]any{"matchLabels": map[string]string{"kubernetes.io/metadata.name": "kube-system"}}}},
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"ports": []map[string]any{{"protocol": "UDP", "port": 53}, {"protocol": "TCP", "port": 53}},
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},
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// api-gateway (LLM inference)
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{
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"to": []map[string]any{{"namespaceSelector": map[string]any{"matchLabels": map[string]string{"kubernetes.io/metadata.name": "api"}}}},
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"ports": []map[string]any{{"protocol": "TCP", "port": 8080}},
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},
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},
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},
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}
|
||
|
|
return s.k8sCreate(ctx, "/apis/networking.k8s.io/v1/namespaces/"+sandboxNamespace+"/networkpolicies", body)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *SandboxManager) waitPodReady(ctx context.Context, sessionID string) error {
|
||
|
|
deadline := time.Now().Add(s.readyTimeout)
|
||
|
|
for time.Now().Before(deadline) {
|
||
|
|
pod, err := s.k8sGet(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods/"+podName(sessionID))
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("poll pod: %w", err)
|
||
|
|
}
|
||
|
|
status, _ := pod["status"].(map[string]any)
|
||
|
|
phase, _ := status["phase"].(string)
|
||
|
|
if phase == "Failed" || phase == "Succeeded" {
|
||
|
|
return fmt.Errorf("pod entered terminal phase %s before ready", phase)
|
||
|
|
}
|
||
|
|
if phase == "Running" {
|
||
|
|
for _, cond := range toSlice(status["conditions"]) {
|
||
|
|
if c, ok := cond.(map[string]any); ok {
|
||
|
|
if c["type"] == "Ready" && c["status"] == "True" {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
select {
|
||
|
|
case <-time.After(2 * time.Second):
|
||
|
|
case <-ctx.Done():
|
||
|
|
return ctx.Err()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return fmt.Errorf("pod not ready after %v", s.readyTimeout)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *SandboxManager) deletePod(ctx context.Context, sessionID string) error {
|
||
|
|
return s.k8sDelete(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods/"+podName(sessionID))
|
||
|
|
}
|
||
|
|
func (s *SandboxManager) deleteService(ctx context.Context, sessionID string) error {
|
||
|
|
return s.k8sDelete(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/services/"+svcName(sessionID))
|
||
|
|
}
|
||
|
|
func (s *SandboxManager) deletePVC(ctx context.Context, sessionID string) error {
|
||
|
|
return s.k8sDelete(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/persistentvolumeclaims/"+pvcName(sessionID))
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *SandboxManager) listSandboxPods(ctx context.Context) ([]any, error) {
|
||
|
|
body, err := s.k8sGet(ctx, "/api/v1/namespaces/"+sandboxNamespace+"/pods?labelSelector=app%3Dpi-session")
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
items, _ := body["items"].([]any)
|
||
|
|
return items, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ── raw k8s HTTP ─────────────────────────────────────────────────────────
|
||
|
|
|
||
|
|
func (s *SandboxManager) k8sGet(ctx context.Context, path string) (map[string]any, error) {
|
||
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodGet, s.k8sHost+path, nil)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
req.Header.Set("Authorization", "Bearer "+sandboxSAToken())
|
||
|
|
resp, err := s.k8sClient.Do(req)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("k8s GET %s: %w", path, err)
|
||
|
|
}
|
||
|
|
defer resp.Body.Close()
|
||
|
|
if resp.StatusCode == 404 {
|
||
|
|
return nil, &k8sNotFound{path: path}
|
||
|
|
}
|
||
|
|
if resp.StatusCode >= 400 {
|
||
|
|
b, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
|
||
|
|
return nil, fmt.Errorf("k8s GET %s returned %d: %s", path, resp.StatusCode, b)
|
||
|
|
}
|
||
|
|
var result map[string]any
|
||
|
|
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
|
||
|
|
return nil, fmt.Errorf("decode: %w", err)
|
||
|
|
}
|
||
|
|
return result, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *SandboxManager) k8sCreate(ctx context.Context, path string, body any) error {
|
||
|
|
payload, err := json.Marshal(body)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("marshal: %w", err)
|
||
|
|
}
|
||
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodPost, s.k8sHost+path, bytes.NewReader(payload))
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
req.Header.Set("Authorization", "Bearer "+sandboxSAToken())
|
||
|
|
req.Header.Set("Content-Type", "application/json")
|
||
|
|
resp, err := s.k8sClient.Do(req)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("k8s POST %s: %w", path, err)
|
||
|
|
}
|
||
|
|
defer resp.Body.Close()
|
||
|
|
if resp.StatusCode == 409 { // AlreadyExists — idempotent
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
|
||
|
|
b, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
|
||
|
|
return fmt.Errorf("k8s POST %s returned %d: %s", path, resp.StatusCode, b)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *SandboxManager) k8sDelete(ctx context.Context, path string) error {
|
||
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodDelete, s.k8sHost+path, nil)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
req.Header.Set("Authorization", "Bearer "+sandboxSAToken())
|
||
|
|
resp, err := s.k8sClient.Do(req)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("k8s DELETE %s: %w", path, err)
|
||
|
|
}
|
||
|
|
defer resp.Body.Close()
|
||
|
|
if resp.StatusCode == 404 {
|
||
|
|
return &k8sNotFound{path: path}
|
||
|
|
}
|
||
|
|
if resp.StatusCode >= 400 {
|
||
|
|
b, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
|
||
|
|
return fmt.Errorf("k8s DELETE %s returned %d: %s", path, resp.StatusCode, b)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ── error helpers ─────────────────────────────────────────────────────────
|
||
|
|
|
||
|
|
type k8sNotFound struct{ path string }
|
||
|
|
|
||
|
|
func (e *k8sNotFound) Error() string { return "not found: " + e.path }
|
||
|
|
|
||
|
|
func isNotFound(err error) bool {
|
||
|
|
if err == nil {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
_, ok := err.(*k8sNotFound)
|
||
|
|
return ok
|
||
|
|
}
|
||
|
|
|
||
|
|
func toSlice(v any) []any {
|
||
|
|
if s, ok := v.([]any); ok {
|
||
|
|
return s
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|