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Implement host registration, JWT refresh tokens, and multi-host scheduling

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Replaces the hardcoded CP_HOST_AGENT_ADDR single-agent setup with a
DB-driven registration system supporting multiple host agents (BYOC).

Key changes:
- Host agents register via one-time token, receive a 7-day JWT + 60-day
  refresh token; heartbeat loop auto-refreshes on 401/403 and pauses all
  sandboxes if refresh fails
- HostClientPool: lazy Connect RPC client cache keyed by host ID, replacing
  the single static agent client throughout the API and service layers
- RoundRobinScheduler: picks an online host for each new sandbox via
  ListActiveHosts; extensible for future scheduling strategies
- HostMonitor (replaces Reconciler): passive heartbeat staleness check marks
  hosts unreachable and sandboxes missing after 90s; active reconciliation
  per online host restores missing-but-alive sandboxes and stops orphans
- Graceful host delete: returns 409 with affected sandbox list without
  ?force=true; force-delete destroys sandboxes then evicts pool client
- Snapshot delete broadcasts to all online hosts (templates have no host_id)
- sandbox.Manager.PauseAll: pauses all running VMs on CP connectivity loss
- New migration: host_refresh_tokens table with token rotation (issue-then-
  revoke ordering to prevent lockout on mid-rotation crash)
- New sandbox status 'missing' (reversible, unlike 'stopped') and host
  status 'unreachable'; both reflected in OpenAPI spec
- Fix: refresh token auth failure now returns 401 (was 400 via generic
  'invalid' substring match in serviceErrToHTTP)
This commit is contained in:
Rafeed M. Bhuiyan
2026-03-24 18:32:05 +06:00
parent f968da9768
commit 9bf67aa7f7
33 changed files with 1567 additions and 318 deletions
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18
internal/api/handlers_exec_stream.go
View File

@ -14,17 +14,17 @@ import (
"git.omukk.dev/wrenn/sandbox/internal/auth"
"git.omukk.dev/wrenn/sandbox/internal/db"
"git.omukk.dev/wrenn/sandbox/internal/lifecycle"
pb "git.omukk.dev/wrenn/sandbox/proto/hostagent/gen"
"git.omukk.dev/wrenn/sandbox/proto/hostagent/gen/hostagentv1connect"
)
type execStreamHandler struct {
db *db.Queries
agent hostagentv1connect.HostAgentServiceClient
db *db.Queries
pool *lifecycle.HostClientPool
}
func newExecStreamHandler(db *db.Queries, agent hostagentv1connect.HostAgentServiceClient) *execStreamHandler {
return &execStreamHandler{db: db, agent: agent}
func newExecStreamHandler(db *db.Queries, pool *lifecycle.HostClientPool) *execStreamHandler {
return &execStreamHandler{db: db, pool: pool}
}
var upgrader = websocket.Upgrader{
@ -80,11 +80,17 @@ func (h *execStreamHandler) ExecStream(w http.ResponseWriter, r *http.Request) {
return
}
agent, err := agentForHost(ctx, h.db, h.pool, sb.HostID)
if err != nil {
sendWSError(conn, "sandbox host is not reachable")
return
}
// Open streaming exec to host agent.
streamCtx, cancel := context.WithCancel(ctx)
defer cancel()
stream, err := h.agent.ExecStream(streamCtx, connect.NewRequest(&pb.ExecStreamRequest{
stream, err := agent.ExecStream(streamCtx, connect.NewRequest(&pb.ExecStreamRequest{
SandboxId: sandboxID,
Cmd: startMsg.Cmd,
Args: startMsg.Args,