99 lines
4.0 KiB
Go
99 lines
4.0 KiB
Go
package store
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import (
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"context"
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"crypto/sha256"
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"database/sql"
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"encoding/binary"
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"errors"
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"time"
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rvboxv1 "github.com/rvbox/rvbox/gen/go/rvbox/v1"
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"github.com/rvbox/rvbox/internal/domain"
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)
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var ErrSignalDeliveryUnavailable = errors.New("signal delivery is unavailable for this command state")
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type SignalInput struct {
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IssueUUID domain.UUID
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ClientID string
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RequestUUID domain.UUID
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Signal rvboxv1.SignalKind
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Hash [32]byte
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OccurredAt time.Time
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}
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type SignalResult struct {
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CommandRevision uint64
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Duplicate bool
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Cancelled bool
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}
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// SignalCommand applies the only locally-completable signal operation: a
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// queued command can be cancelled before dispatch. For dispatched/accepted/
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// running work the revisioned remote delivery path is intentionally not
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// claimed until a live session control queue is available.
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func (store *Store) SignalCommand(ctx context.Context, input SignalInput) (SignalResult, error) {
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if input.IssueUUID == (domain.UUID{}) || input.ClientID == "" || input.RequestUUID == (domain.UUID{}) || input.Signal < rvboxv1.SignalKind_SIGNAL_HUP || input.Signal > rvboxv1.SignalKind_SIGNAL_USR2 || input.Hash == [32]byte{} || input.OccurredAt.IsZero() {
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return SignalResult{}, errors.New("invalid signal request")
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}
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store.writeMu.Lock()
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defer store.writeMu.Unlock()
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database, err := store.openDatabase()
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if err != nil {
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return SignalResult{}, err
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}
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method := "signal_command"
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target := input.IssueUUID.String()
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if existing, found, lookupErr := lookupControlMutation(ctx, database, input.RequestUUID, method, target, input.Hash); lookupErr != nil {
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return SignalResult{}, lookupErr
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} else if found {
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if len(existing) != 8 {
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return SignalResult{}, ErrInvalidSegmentRecord
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}
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return SignalResult{CommandRevision: binary.BigEndian.Uint64(existing), Duplicate: true}, nil
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}
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tx, err := database.BeginTx(ctx, nil)
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if err != nil {
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return SignalResult{}, err
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}
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defer tx.Rollback()
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var lifecycle uint32
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var revision uint64
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err = tx.QueryRowContext(ctx, `SELECT lifecycle, revision FROM commands WHERE issue_uuid = ? AND client_id = ?`, input.IssueUUID[:], input.ClientID).Scan(&lifecycle, &revision)
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if errors.Is(err, sql.ErrNoRows) {
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return SignalResult{}, ErrCommandNotFound
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}
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if err != nil {
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return SignalResult{}, err
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}
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if lifecycle != uint32(rvboxv1.CommandLifecycle_COMMAND_QUEUED) {
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return SignalResult{}, ErrSignalDeliveryUnavailable
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}
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if revision == ^uint64(0) {
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return SignalResult{}, errors.New("command revision exhausted")
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}
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nextRevision := revision + 1
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if _, err := tx.ExecContext(ctx, `UPDATE commands SET lifecycle = ?, terminal_time = ?, revision = ? WHERE issue_uuid = ? AND client_id = ? AND lifecycle = ? AND revision = ?`, rvboxv1.CommandLifecycle_COMMAND_CANCELLED, input.OccurredAt.UTC().UnixNano(), nextRevision, input.IssueUUID[:], input.ClientID, rvboxv1.CommandLifecycle_COMMAND_QUEUED, revision); err != nil {
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return SignalResult{}, err
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}
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result := make([]byte, 8)
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binary.BigEndian.PutUint64(result, nextRevision)
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_, err = tx.ExecContext(ctx, `INSERT INTO control_mutations (request_uuid, method, owner_kind, owner_id, target, immutable_sha256, assigned_revision, result, created_at) VALUES (?, ?, 'command', ?, ?, ?, ?, ?, ?)`, input.RequestUUID[:], method, input.IssueUUID.String(), target, input.Hash[:], nextRevision, result, input.OccurredAt.UTC().UnixNano())
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if err != nil {
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return SignalResult{}, err
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}
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// Keep a compact audit digest; command text/stdin is never copied to the
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// audit payload.
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auditPayload := []byte{byte(input.Signal)}
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auditHash := sha256.Sum256(auditPayload)
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_, err = tx.ExecContext(ctx, `INSERT INTO audit_events (occurred_at, source, action, outcome, compression, payload, raw_bytes, stored_bytes, sha256) VALUES (?, 'control', ?, 'success', 1, ?, ?, ?, ?)`, input.OccurredAt.UTC().UnixNano(), method, auditPayload, len(auditPayload), len(auditPayload), auditHash[:])
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if err != nil {
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return SignalResult{}, err
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}
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if err := tx.Commit(); err != nil {
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return SignalResult{}, err
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}
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return SignalResult{CommandRevision: nextRevision, Cancelled: true}, nil
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}
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