63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Package store persists and restores the daemon's current state as a single
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// JSON snapshot. It is the M0 source of durability; the hash-chained audit log
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// arrives in a later milestone.
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package store
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import (
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"encoding/json"
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"errors"
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"os"
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"path/filepath"
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"antidrift/internal/domain"
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)
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// Snapshot is the persisted current state of the daemon.
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type Snapshot struct {
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RuntimeState domain.RuntimeState `json:"runtime_state"`
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Commitment *domain.Commitment `json:"commitment,omitempty"`
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DeadlineUnixSecs int64 `json:"deadline_unix_secs,omitempty"`
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}
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// DefaultPath returns ~/.antidrift/state.json.
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func DefaultPath() (string, error) {
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home, err := os.UserHomeDir()
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if err != nil {
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return "", err
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}
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return filepath.Join(home, ".antidrift", "state.json"), nil
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}
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// Load reads a snapshot. A missing file yields a default Locked snapshot.
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func Load(path string) (Snapshot, error) {
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data, err := os.ReadFile(path)
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if errors.Is(err, os.ErrNotExist) {
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return Snapshot{RuntimeState: domain.RuntimeLocked}, nil
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}
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if err != nil {
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return Snapshot{}, err
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}
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var s Snapshot
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if err := json.Unmarshal(data, &s); err != nil {
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return Snapshot{}, err
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}
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return s, nil
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}
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// Save writes a snapshot atomically (temp file + rename), creating the
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// directory if needed.
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func Save(path string, s Snapshot) error {
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if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
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return err
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}
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data, err := json.MarshalIndent(s, "", " ")
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if err != nil {
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return err
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}
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tmp := path + ".tmp"
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if err := os.WriteFile(tmp, data, 0o644); err != nil {
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return err
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}
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return os.Rename(tmp, path)
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}
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