| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "strconv" |
| 5 | "strings" |
| 6 | "time" |
| 7 | ) |
| 8 | |
| 9 | // parseInterval converts a string like "5m", "1h", "30s" to time.Duration. |
| 10 | // Suffix after '|' is stripped (e.g. "24h|daily@09:00" -> "24h"). |
| 11 | // Empty or invalid strings return 0, nil (task will be skipped). |
| 12 | func parseInterval(s string) (time.Duration, error) { |
| 13 | if idx := strings.Index(s, "|"); idx >= 0 { |
| 14 | s = s[:idx] |
| 15 | } |
| 16 | if len(s) == 0 { |
| 17 | return 0, nil |
| 18 | } |
| 19 | // Support common suffixed intervals |
| 20 | switch s[len(s)-1] { |
| 21 | case 's', 'm', 'h': |
| 22 | return time.ParseDuration(s) |
| 23 | default: |
| 24 | // Try "Xm" as default assumption |
| 25 | return time.ParseDuration(s + "m") |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | // isCronExpr returns true when s looks like a valid 5-field cron expression |
| 30 | // (e.g. "0 * * * *", "*/15 * * * *", "0 9 * * 1-5"). Rejects expressions with |
| 31 | // out-of-range values (e.g. "99 * * * *") that would never match. |
| 32 | func isCronExpr(s string) bool { |
| 33 | fields := strings.Fields(s) |
| 34 | if len(fields) != 5 { |
| 35 | return false |
| 36 | } |
| 37 | // min, hour, dom, month, dow — dom/month are 1-based (0 can never match |
| 38 | // time.Day()/time.Month()), dow is 0-7 (7 = Sunday alias, matched in cronDue). |
| 39 | limits := []int{59, 23, 31, 12, 7} |
| 40 | mins := []int{0, 0, 1, 1, 0} |
| 41 | for i, f := range fields { |
| 42 | if f == "" { |
| 43 | return false |
| 44 | } |
| 45 | for _, c := range f { |
| 46 | if !strings.ContainsRune("0123456789*/-,", c) { |
| 47 | return false |
| 48 | } |
| 49 | } |
| 50 | // Reject out-of-range values in each field, plus zero/empty step |
| 51 | // values ("*/0" never fires) and descending ranges ("5-1" never matches). |
| 52 | for part := range strings.SplitSeq(f, ",") { |
| 53 | part = strings.TrimSpace(part) |
| 54 | base := part |
| 55 | if stepBase, stepText, ok := strings.Cut(part, "/"); ok { |
| 56 | step, err := strconv.Atoi(stepText) |
| 57 | if err != nil || step < 1 { |
| 58 | return false |
| 59 | } |
| 60 | base = stepBase |
| 61 | } |
| 62 | if base == "*" { |
| 63 | continue |
| 64 | } |
| 65 | if loText, hiText, ok := strings.Cut(base, "-"); ok { |
| 66 | lo, err1 := strconv.Atoi(loText) |
| 67 | hi, err2 := strconv.Atoi(hiText) |
| 68 | if err1 != nil || err2 != nil || lo < mins[i] || hi > limits[i] || lo > hi { |
| 69 | return false |
| 70 | } |
| 71 | } else { |
| 72 | v, err := strconv.Atoi(base) |
| 73 | if err != nil || v < mins[i] || v > limits[i] { |
| 74 | return false |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | return true |
| 80 | } |
| 81 | |
| 82 | // cronMatchField checks whether a single value matches a cron field pattern. |
| 83 | func cronMatchField(pattern string, value, minValue, maxValue int) bool { |
| 84 | // Handle comma-separated lists |
| 85 | for part := range strings.SplitSeq(pattern, ",") { |
| 86 | part = strings.TrimSpace(part) |
| 87 | if cronMatchSingle(part, value, minValue, maxValue) { |
| 88 | return true |
| 89 | } |
| 90 | } |
| 91 | return false |
| 92 | } |
| 93 | |
| 94 | func cronMatchSingle(pattern string, value, minValue, maxValue int) bool { |
| 95 | // Handle step values: */15, 1-10/2, 1/2. Wildcard steps are |
| 96 | // anchored at the field minimum, which matters for 1-based fields. |
| 97 | if rangePart, stepStr, ok := strings.Cut(pattern, "/"); ok { |
| 98 | step, err := strconv.Atoi(stepStr) |
| 99 | if err != nil || step <= 0 { |
| 100 | return false |
| 101 | } |
| 102 | if rangePart == "*" { |
| 103 | return value >= minValue && value <= maxValue && (value-minValue)%step == 0 |
| 104 | } |
| 105 | // Range with step: 1-10/2 |
| 106 | if lowText, highText, ok := strings.Cut(rangePart, "-"); ok { |
| 107 | low, _ := strconv.Atoi(lowText) |
| 108 | high, _ := strconv.Atoi(highText) |
| 109 | if value < low || value > high { |
| 110 | return false |
| 111 | } |
| 112 | return (value-low)%step == 0 |
| 113 | } |
| 114 | low, err := strconv.Atoi(rangePart) |
| 115 | if err != nil || value < low || value > maxValue { |
| 116 | return false |
| 117 | } |
| 118 | return (value-low)%step == 0 |
| 119 | } |
| 120 | // Handle ranges: 1-5 |
| 121 | if lowText, highText, ok := strings.Cut(pattern, "-"); ok { |
| 122 | low, err1 := strconv.Atoi(lowText) |
| 123 | high, err2 := strconv.Atoi(highText) |
| 124 | if err1 != nil || err2 != nil { |
| 125 | return false |
| 126 | } |
| 127 | return value >= low && value <= high |
| 128 | } |
| 129 | // Handle wildcard |
| 130 | if pattern == "*" { |
| 131 | return true |
| 132 | } |
| 133 | // Handle literal value |
| 134 | v, err := strconv.Atoi(pattern) |
| 135 | if err != nil { |
| 136 | return false |
| 137 | } |
| 138 | return v == value |
| 139 | } |
| 140 | |
| 141 | // cronDue checks whether a 5-field cron expression should fire at the given time. |
| 142 | func cronDue(expr string, t time.Time) bool { |
| 143 | if !isCronExpr(expr) { |
| 144 | return false |
| 145 | } |
| 146 | fields := strings.Fields(expr) |
| 147 | if len(fields) != 5 { |
| 148 | return false |
| 149 | } |
| 150 | // Minute/hour/month must all match. When both day fields are restricted, |
| 151 | // standard cron ORs them: "0 9 1 * 1" fires on the 1st or on Mondays, |
| 152 | // rather than only when the 1st happens to be a Monday. |
| 153 | domRestricted := fields[2] != "*" |
| 154 | dowRestricted := fields[4] != "*" |
| 155 | domMatch := cronMatchField(fields[2], t.Day(), 1, 31) |
| 156 | // Standard cron allows 7 as a Sunday alias in the dow field (weekday is |
| 157 | // 0-6 in Go); a pattern like "0 9 * * 7" must still fire on Sundays. |
| 158 | weekday := int(t.Weekday()) |
| 159 | dowMatch := cronMatchField(fields[4], weekday, 0, 7) || (weekday == 0 && cronMatchField(fields[4], 7, 0, 7)) |
| 160 | dayMatch := !domRestricted || !dowRestricted |
| 161 | if domRestricted && dowRestricted { |
| 162 | dayMatch = domMatch || dowMatch |
| 163 | } else if domRestricted { |
| 164 | dayMatch = domMatch |
| 165 | } else if dowRestricted { |
| 166 | dayMatch = dowMatch |
| 167 | } |
| 168 | return cronMatchField(fields[0], t.Minute(), 0, 59) && |
| 169 | cronMatchField(fields[1], t.Hour(), 0, 23) && |
| 170 | dayMatch && |
| 171 | cronMatchField(fields[3], int(t.Month()), 1, 12) |
| 172 | } |
| 173 | |
| 174 | func heartbeatTaskDueAt(t HeartbeatTask, now time.Time) bool { |
| 175 | // Try cron expression first |
| 176 | if isCronExpr(t.Interval) { |
| 177 | if cronDue(t.Interval, now) { |
| 178 | if t.LastRunAt == 0 || time.UnixMilli(t.LastRunAt).Before(now.Truncate(time.Minute)) { |
| 179 | return true |
| 180 | } |
| 181 | } |
| 182 | return false |
| 183 | } |
| 184 | |
| 185 | if scheduled, ok := previousHeartbeatScheduleAt(t, now); ok { |
| 186 | if t.CreatedAt != 0 && scheduled.Before(time.UnixMilli(t.CreatedAt)) { |
| 187 | return false |
| 188 | } |
| 189 | if t.LastRunAt != 0 && !time.UnixMilli(t.LastRunAt).Before(scheduled) { |
| 190 | return false |
| 191 | } |
| 192 | return !scheduled.After(now) |
| 193 | } |
| 194 | |
| 195 | d, err := parseInterval(t.Interval) |
| 196 | if err != nil || d <= 0 { |
| 197 | return false |
| 198 | } |
| 199 | baseMillis := t.LastRunAt |
| 200 | if baseMillis == 0 { |
| 201 | baseMillis = t.CreatedAt |
| 202 | } |
| 203 | hasTimeWindow := t.TimeWindowStart != "" || t.TimeWindowEnd != "" |
| 204 | if baseMillis == 0 { |
| 205 | if hasTimeWindow { |
| 206 | return heartbeatWithinTimeWindow(t, now) |
| 207 | } |
| 208 | return true |
| 209 | } |
| 210 | if now.Sub(time.UnixMilli(baseMillis)) < d { |
| 211 | return false |
| 212 | } |
| 213 | |
| 214 | // For interval-based tasks with a time window, check if current time |
| 215 | // falls within the configured window. If outside, defer until the next |
| 216 | // tick that falls within the window. |
| 217 | if hasTimeWindow { |
| 218 | return heartbeatWithinTimeWindow(t, now) |
| 219 | } |
| 220 | |
| 221 | return true |
| 222 | } |
| 223 | |
| 224 | // heartbeatWithinTimeWindow returns true when now falls within the task's |
| 225 | // configured time window. If the window is empty it returns true. |
| 226 | // Format: "HH:MM" in 24-hour clock; start inclusive, end exclusive. |
| 227 | func heartbeatWithinTimeWindow(t HeartbeatTask, now time.Time) bool { |
| 228 | startH, startM, startOK := parseHeartbeatClock(t.TimeWindowStart) |
| 229 | endH, endM, endOK := parseHeartbeatClock(t.TimeWindowEnd) |
| 230 | |
| 231 | if !startOK && !endOK { |
| 232 | return true // no window configured |
| 233 | } |
| 234 | |
| 235 | minutes := now.Hour()*60 + now.Minute() |
| 236 | |
| 237 | // If only start is set: allow from start to end of day |
| 238 | if startOK && !endOK { |
| 239 | return minutes >= startH*60+startM |
| 240 | } |
| 241 | |
| 242 | // If only end is set: allow from midnight to end |
| 243 | if !startOK && endOK { |
| 244 | return minutes < endH*60+endM |
| 245 | } |
| 246 | |
| 247 | startMin := startH*60 + startM |
| 248 | endMin := endH*60 + endM |
| 249 | |
| 250 | if startMin < endMin { |
| 251 | // Normal window: 09:00-17:00 |
| 252 | return minutes >= startMin && minutes < endMin |
| 253 | } |
| 254 | // Cross-midnight window: 22:00-06:00 |
| 255 | return minutes >= startMin || minutes < endMin |
| 256 | } |
| 257 | |
| 258 | type heartbeatSchedule struct { |
| 259 | kind string |
| 260 | days []time.Weekday |
| 261 | month int |
| 262 | day int |
| 263 | hour int |
| 264 | minute int |
| 265 | hasRules bool |
| 266 | } |
| 267 | |
| 268 | func parseHeartbeatSchedule(interval string) (heartbeatSchedule, bool) { |
| 269 | _, after, ok0 := strings.Cut(interval, "|") |
| 270 | if !ok0 { |
| 271 | return heartbeatSchedule{}, false |
| 272 | } |
| 273 | raw := strings.TrimSpace(after) |
| 274 | if raw == "" { |
| 275 | return heartbeatSchedule{}, false |
| 276 | } |
| 277 | at := "09:00" |
| 278 | if parts := strings.SplitN(raw, "@", 2); len(parts) == 2 { |
| 279 | raw = parts[0] |
| 280 | at = parts[1] |
| 281 | } |
| 282 | hour, minute, ok := parseHeartbeatClock(at) |
| 283 | if !ok { |
| 284 | return heartbeatSchedule{}, false |
| 285 | } |
| 286 | kind := raw |
| 287 | rule := "" |
| 288 | if parts := strings.SplitN(raw, ":", 2); len(parts) == 2 { |
| 289 | kind = parts[0] |
| 290 | rule = parts[1] |
| 291 | } |
| 292 | s := heartbeatSchedule{kind: kind, hour: hour, minute: minute, hasRules: true} |
| 293 | switch kind { |
| 294 | case "daily": |
| 295 | return s, true |
| 296 | case "weekly", "biweekly": |
| 297 | for part := range strings.SplitSeq(rule, ",") { |
| 298 | if wd, ok := parseHeartbeatWeekday(part); ok { |
| 299 | s.days = append(s.days, wd) |
| 300 | } |
| 301 | } |
| 302 | return s, len(s.days) > 0 |
| 303 | case "monthly": |
| 304 | s.day = parsePositiveInt(rule, 1) |
| 305 | return s, true |
| 306 | case "yearly": |
| 307 | parts := strings.SplitN(rule, "-", 2) |
| 308 | s.month = parsePositiveInt(firstString(parts), 1) |
| 309 | s.day = 1 |
| 310 | if len(parts) == 2 { |
| 311 | s.day = parsePositiveInt(parts[1], 1) |
| 312 | } |
| 313 | if s.month < 1 { |
| 314 | s.month = 1 |
| 315 | } |
| 316 | if s.month > 12 { |
| 317 | s.month = 12 |
| 318 | } |
| 319 | return s, true |
| 320 | default: |
| 321 | return heartbeatSchedule{}, false |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | func previousHeartbeatScheduleAt(t HeartbeatTask, now time.Time) (time.Time, bool) { |
| 326 | s, ok := parseHeartbeatSchedule(t.Interval) |
| 327 | if !ok || !s.hasRules { |
| 328 | return time.Time{}, false |
| 329 | } |
| 330 | switch s.kind { |
| 331 | case "daily": |
| 332 | candidate := dateAt(now.Year(), now.Month(), now.Day(), s.hour, s.minute, now.Location()) |
| 333 | if candidate.After(now) { |
| 334 | candidate = candidate.AddDate(0, 0, -1) |
| 335 | } |
| 336 | return candidate, true |
| 337 | case "weekly": |
| 338 | return previousHeartbeatWeeklyAt(s, now, 7, time.Time{}) |
| 339 | case "biweekly": |
| 340 | anchor := heartbeatScheduleAnchor(t, now) |
| 341 | return previousHeartbeatWeeklyAt(s, now, 14, anchor) |
| 342 | case "monthly": |
| 343 | return previousHeartbeatMonthlyAt(s, now), true |
| 344 | case "yearly": |
| 345 | return previousHeartbeatYearlyAt(s, now), true |
| 346 | default: |
| 347 | return time.Time{}, false |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | func previousHeartbeatWeeklyAt(s heartbeatSchedule, now time.Time, windowDays int, anchor time.Time) (time.Time, bool) { |
| 352 | var best time.Time |
| 353 | for offset := range windowDays { |
| 354 | day := now.AddDate(0, 0, -offset) |
| 355 | for _, wd := range s.days { |
| 356 | if day.Weekday() != wd { |
| 357 | continue |
| 358 | } |
| 359 | candidate := dateAt(day.Year(), day.Month(), day.Day(), s.hour, s.minute, now.Location()) |
| 360 | if candidate.After(now) { |
| 361 | continue |
| 362 | } |
| 363 | if !anchor.IsZero() && weeksBetween(weekStart(anchor), weekStart(candidate))%2 != 0 { |
| 364 | continue |
| 365 | } |
| 366 | if best.IsZero() || candidate.After(best) { |
| 367 | best = candidate |
| 368 | } |
| 369 | } |
| 370 | } |
| 371 | return best, !best.IsZero() |
| 372 | } |
| 373 | |
| 374 | func previousHeartbeatMonthlyAt(s heartbeatSchedule, now time.Time) time.Time { |
| 375 | candidate := monthlyCandidate(now.Year(), now.Month(), s.day, s.hour, s.minute, now.Location()) |
| 376 | if candidate.After(now) { |
| 377 | prev := now.AddDate(0, -1, 0) |
| 378 | candidate = monthlyCandidate(prev.Year(), prev.Month(), s.day, s.hour, s.minute, now.Location()) |
| 379 | } |
| 380 | return candidate |
| 381 | } |
| 382 | |
| 383 | func previousHeartbeatYearlyAt(s heartbeatSchedule, now time.Time) time.Time { |
| 384 | month := time.Month(s.month) |
| 385 | candidate := monthlyCandidate(now.Year(), month, s.day, s.hour, s.minute, now.Location()) |
| 386 | if candidate.After(now) { |
| 387 | candidate = monthlyCandidate(now.Year()-1, month, s.day, s.hour, s.minute, now.Location()) |
| 388 | } |
| 389 | return candidate |
| 390 | } |
| 391 | |
| 392 | func heartbeatScheduleAnchor(t HeartbeatTask, now time.Time) time.Time { |
| 393 | if t.CreatedAt != 0 { |
| 394 | return time.UnixMilli(t.CreatedAt) |
| 395 | } |
| 396 | if t.LastRunAt != 0 { |
| 397 | return time.UnixMilli(t.LastRunAt) |
| 398 | } |
| 399 | return now |
| 400 | } |
| 401 | |
| 402 | func parseHeartbeatClock(s string) (int, int, bool) { |
| 403 | parts := strings.SplitN(strings.TrimSpace(s), ":", 2) |
| 404 | if len(parts) != 2 { |
| 405 | return 0, 0, false |
| 406 | } |
| 407 | hour := parsePositiveInt(parts[0], -1) |
| 408 | minute := parsePositiveInt(parts[1], -1) |
| 409 | if hour < 0 || hour > 23 || minute < 0 || minute > 59 { |
| 410 | return 0, 0, false |
| 411 | } |
| 412 | return hour, minute, true |
| 413 | } |
| 414 | |
| 415 | func parseHeartbeatWeekday(s string) (time.Weekday, bool) { |
| 416 | switch strings.ToLower(strings.TrimSpace(s)) { |
| 417 | case "sun": |
| 418 | return time.Sunday, true |
| 419 | case "mon": |
| 420 | return time.Monday, true |
| 421 | case "tue": |
| 422 | return time.Tuesday, true |
| 423 | case "wed": |
| 424 | return time.Wednesday, true |
| 425 | case "thu": |
| 426 | return time.Thursday, true |
| 427 | case "fri": |
| 428 | return time.Friday, true |
| 429 | case "sat": |
| 430 | return time.Saturday, true |
| 431 | default: |
| 432 | return time.Sunday, false |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | func parsePositiveInt(s string, fallback int) int { |
| 437 | s = strings.TrimSpace(s) |
| 438 | if s == "" { |
| 439 | return fallback |
| 440 | } |
| 441 | n := 0 |
| 442 | for _, r := range s { |
| 443 | if r < '0' || r > '9' { |
| 444 | return fallback |
| 445 | } |
| 446 | n = n*10 + int(r-'0') |
| 447 | } |
| 448 | return n |
| 449 | } |
| 450 | |
| 451 | func firstString(values []string) string { |
| 452 | if len(values) == 0 { |
| 453 | return "" |
| 454 | } |
| 455 | return values[0] |
| 456 | } |
| 457 | |
| 458 | func dateAt(year int, month time.Month, day, hour, minute int, loc *time.Location) time.Time { |
| 459 | return time.Date(year, month, day, hour, minute, 0, 0, loc) |
| 460 | } |
| 461 | |
| 462 | func monthlyCandidate(year int, month time.Month, day, hour, minute int, loc *time.Location) time.Time { |
| 463 | if day < 1 { |
| 464 | day = 1 |
| 465 | } |
| 466 | if max := daysInMonth(year, month, loc); day > max { |
| 467 | day = max |
| 468 | } |
| 469 | return dateAt(year, month, day, hour, minute, loc) |
| 470 | } |
| 471 | |
| 472 | func daysInMonth(year int, month time.Month, loc *time.Location) int { |
| 473 | return time.Date(year, month+1, 0, 0, 0, 0, 0, loc).Day() |
| 474 | } |
| 475 | |
| 476 | func weekStart(t time.Time) time.Time { |
| 477 | dayOffset := (int(t.Weekday()) + 6) % 7 |
| 478 | base := dateAt(t.Year(), t.Month(), t.Day(), 0, 0, t.Location()) |
| 479 | return base.AddDate(0, 0, -dayOffset) |
| 480 | } |
| 481 | |
| 482 | func weeksBetween(a, b time.Time) int { |
| 483 | // Compare civil dates in UTC rather than elapsed local hours. Local Monday |
| 484 | // midnights spanning DST can be 167 or 169 hours apart despite being exactly |
| 485 | // one calendar week apart. |
| 486 | aDay := time.Date(a.Year(), a.Month(), a.Day(), 0, 0, 0, 0, time.UTC) |
| 487 | bDay := time.Date(b.Year(), b.Month(), b.Day(), 0, 0, 0, 0, time.UTC) |
| 488 | if bDay.Before(aDay) { |
| 489 | aDay, bDay = bDay, aDay |
| 490 | } |
| 491 | return int(bDay.Sub(aDay) / (7 * 24 * time.Hour)) |
| 492 | } |
| 493 |