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daemon: thread per-RPC op_id end-to-end

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Today there's no way to correlate a CLI failure with a daemon log
line. operationLog records relative timing but no id, two concurrent
vm.start calls log indistinguishably, and the async
vmCreateOperationState.ID is user-facing yet never reaches the
journal. The root helper logs plain text to stderr while bangerd
logs JSON, so a merged journalctl is hard to grep across the
trust-boundary split.

Mint a per-RPC op id at dispatch entry, store it on context, and
include it as an "op_id" attr on every operationLog record. The
id is stamped onto every error response (including the early
short-circuit paths bad_version and unknown_method). rpc.Call
forwards the context op id on requests so a daemon RPC and the
helper RPCs it triggers all share one id. The helper now logs
JSON to match bangerd, adopts the inbound id, and emits a single
"helper rpc completed" / "helper rpc failed" line per call so
operators can see at a glance how long each privileged op took.

vmCreateOperationState.ID is now the same id dispatch generated
for vm.create.begin — one identifier between client status polls,
daemon logs, and helper logs.

The wire format gains two optional fields: rpc.Request.OpID and
rpc.ErrorResponse.OpID, both omitempty so older peers (and the
opposite direction) ignore them. ErrorResponse.Error() now appends
"(op-XXXXXX)" to its string form when set; existing callers that
just print err.Error() get the id for free.

Tests cover: dispatch stamps op_id on unknown_method, bad_version,
and handler-returned errors; rpc.Call exposes the typed
*ErrorResponse via errors.As so the CLI can read code/op_id; ctx
op_id is forwarded to the server in the request envelope.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Thales Maciel 2026-04-26 22:13:44 -03:00
parent b8c48765fb
commit e47b8146dc
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GPG key ID: 33112E6833C34679
16 changed files with 333 additions and 44 deletions
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15
internal/model/types.go
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@ -200,6 +200,21 @@ func NewID() (string, error) {
return hex.EncodeToString(buf), nil
}
// NewOpID returns a short identifier for tracing a single RPC
// operation across the daemon, the root helper, and the user-visible
// CLI error string. Format: "op-" + 12 hex chars (48 bits of entropy
// — collisions inside one daemon session are vanishingly unlikely
// and don't matter beyond it). Short enough to copy-paste from a
// CLI error into a journalctl --grep, long enough to actually
// disambiguate.
func NewOpID() (string, error) {
buf := make([]byte, 6)
if _, err := rand.Read(buf); err != nil {
return "", err
}
return "op-" + hex.EncodeToString(buf), nil
}
func ParseSize(raw string) (int64, error) {
if raw == "" {
return 0, errors.New("size is required")