1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
package askcli
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"slices"
"time"
"codeberg.org/snonux/hexai/internal/stats"
)
const taskAliasCacheTTL = 120 * 24 * time.Hour
var (
nowTaskAliasCache = time.Now
taskAliasCacheRoot = stats.CacheDir
)
type taskAliasCache struct {
NextID uint64 `json:"next_id"`
Entries []taskAliasCacheEntry `json:"entries"`
}
type taskAliasCacheEntry struct {
UUID string `json:"uuid"`
Alias string `json:"alias"`
CreatedAt time.Time `json:"created_at"`
LastAccessedAt time.Time `json:"last_accessed_at"`
}
func ensureTaskAliases(tasks []TaskExport) (map[string]string, error) {
cache, path, err := loadTaskAliasCache()
if err != nil {
return nil, err
}
now := nowTaskAliasCache().UTC()
changed := cache.prune(now)
aliases := make(map[string]string, len(tasks))
for _, task := range tasks {
if task.UUID == "" {
continue
}
alias, updated := cache.ensureAlias(task.UUID, now)
aliases[task.UUID] = alias
changed = changed || updated
}
if !changed {
return aliases, nil
}
if err := cache.save(path); err != nil {
return nil, err
}
return aliases, nil
}
func ensureTaskAliasesForUUIDs(uuids []string) (map[string]string, error) {
tasks := make([]TaskExport, 0, len(uuids))
for _, uuid := range uuids {
if uuid == "" {
continue
}
tasks = append(tasks, TaskExport{UUID: uuid})
}
return ensureTaskAliases(tasks)
}
func loadTaskAliasCache() (taskAliasCache, string, error) {
path, err := taskAliasCachePath()
if err != nil {
return taskAliasCache{}, "", err
}
data, err := os.ReadFile(path)
if os.IsNotExist(err) {
return taskAliasCache{}, path, nil
}
if err != nil {
return taskAliasCache{}, "", fmt.Errorf("read task alias cache: %w", err)
}
var cache taskAliasCache
if err := json.Unmarshal(data, &cache); err != nil {
return taskAliasCache{}, "", fmt.Errorf("parse task alias cache: %w", err)
}
if err := cache.validate(); err != nil {
return taskAliasCache{}, "", fmt.Errorf("validate task alias cache: %w", err)
}
return cache, path, nil
}
func taskAliasCachePath() (string, error) {
dir, err := taskAliasCacheRoot()
if err != nil {
return "", fmt.Errorf("resolve cache dir: %w", err)
}
return filepath.Join(dir, "ask", "task-aliases-v1.json"), nil
}
func (c *taskAliasCache) validate() error {
seenUUIDs := make(map[string]struct{}, len(c.Entries))
seenAliases := make(map[string]struct{}, len(c.Entries))
var maxID uint64
hasEntries := false
for _, entry := range c.Entries {
if entry.UUID == "" {
return fmt.Errorf("entry missing uuid")
}
if entry.Alias == "" {
return fmt.Errorf("entry %q missing alias", entry.UUID)
}
id, ok := decodeTaskAliasID(entry.Alias)
if !ok {
return fmt.Errorf("entry %q has invalid alias %q", entry.UUID, entry.Alias)
}
if _, ok := seenUUIDs[entry.UUID]; ok {
return fmt.Errorf("duplicate uuid %q", entry.UUID)
}
if _, ok := seenAliases[entry.Alias]; ok {
return fmt.Errorf("duplicate alias %q", entry.Alias)
}
seenUUIDs[entry.UUID] = struct{}{}
seenAliases[entry.Alias] = struct{}{}
if !hasEntries || id > maxID {
maxID = id
hasEntries = true
}
}
if hasEntries && c.NextID <= maxID {
return fmt.Errorf("next_id %d must be greater than max alias id %d", c.NextID, maxID)
}
return nil
}
func (c *taskAliasCache) prune(now time.Time) bool {
if len(c.Entries) == 0 {
return false
}
kept := c.Entries[:0]
changed := false
for _, entry := range c.Entries {
if now.Sub(entry.lastTouchedAt()) > taskAliasCacheTTL {
changed = true
continue
}
kept = append(kept, entry)
}
c.Entries = kept
if changed {
c.sortEntries()
}
return changed
}
func (c *taskAliasCache) ensureAlias(uuid string, now time.Time) (string, bool) {
if entry, ok := c.findEntry(func(entry taskAliasCacheEntry) bool { return entry.UUID == uuid }); ok {
if entry.LastAccessedAt.Equal(now) {
return entry.Alias, false
}
entry.LastAccessedAt = now
return entry.Alias, true
}
alias := encodeTaskAliasID(c.NextID)
c.NextID++
c.Entries = append(c.Entries, taskAliasCacheEntry{
UUID: uuid,
Alias: alias,
CreatedAt: now,
LastAccessedAt: now,
})
c.sortEntries()
return alias, true
}
func (c *taskAliasCache) findEntry(match func(taskAliasCacheEntry) bool) (*taskAliasCacheEntry, bool) {
for i := range c.Entries {
if match(c.Entries[i]) {
return &c.Entries[i], true
}
}
return nil, false
}
func (c *taskAliasCache) lookupUUIDByAlias(alias string, now time.Time) (string, bool, bool) {
entry, ok := c.findEntry(func(entry taskAliasCacheEntry) bool { return entry.Alias == alias })
if !ok {
return "", false, false
}
changed := !entry.LastAccessedAt.Equal(now)
entry.LastAccessedAt = now
return entry.UUID, true, changed
}
func (c *taskAliasCache) lookupAliasByUUID(uuid string, now time.Time) (string, bool, bool) {
entry, ok := c.findEntry(func(entry taskAliasCacheEntry) bool { return entry.UUID == uuid })
if !ok {
return "", false, false
}
changed := !entry.LastAccessedAt.Equal(now)
entry.LastAccessedAt = now
return entry.Alias, true, changed
}
func (c *taskAliasCache) save(path string) error {
if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
return fmt.Errorf("create task alias cache dir: %w", err)
}
data, err := json.MarshalIndent(c, "", " ")
if err != nil {
return fmt.Errorf("marshal task alias cache: %w", err)
}
tempPath := path + ".tmp"
if err := os.WriteFile(tempPath, data, 0o600); err != nil {
return fmt.Errorf("write task alias cache: %w", err)
}
if err := os.Rename(tempPath, path); err != nil {
return fmt.Errorf("replace task alias cache: %w", err)
}
return nil
}
func (c *taskAliasCache) sortEntries() {
slices.SortFunc(c.Entries, func(a, b taskAliasCacheEntry) int {
switch {
case a.UUID < b.UUID:
return -1
case a.UUID > b.UUID:
return 1
default:
return 0
}
})
}
func (e taskAliasCacheEntry) lastTouchedAt() time.Time {
if !e.LastAccessedAt.IsZero() {
return e.LastAccessedAt
}
return e.CreatedAt
}
func encodeTaskAliasID(id uint64) string {
const alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"
width := 1
blockSize := uint64(len(alphabet))
remaining := id
for remaining >= blockSize {
remaining -= blockSize
width++
blockSize *= uint64(len(alphabet))
}
buf := make([]byte, width)
for i := width - 1; i >= 0; i-- {
buf[i] = alphabet[remaining%uint64(len(alphabet))]
remaining /= uint64(len(alphabet))
}
return string(buf)
}
func decodeTaskAliasID(alias string) (uint64, bool) {
const alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"
if alias == "" {
return 0, false
}
width := len(alias)
var id uint64
blockSize := uint64(len(alphabet))
for i := 1; i < width; i++ {
id += blockSize
blockSize *= uint64(len(alphabet))
}
var value uint64
for _, r := range alias {
index := int64(-1)
for i, candidate := range alphabet {
if r == candidate {
index = int64(i)
break
}
}
if index < 0 {
return 0, false
}
value = value*uint64(len(alphabet)) + uint64(index)
}
return id + value, true
}
|
