|
| 1 | +package helpers |
| 2 | + |
| 3 | +import ( |
| 4 | + "strconv" |
| 5 | + "strings" |
| 6 | + |
| 7 | + "golang.org/x/xerrors" |
| 8 | +) |
| 9 | + |
| 10 | +// ValidateSchedules checks if any schedules overlap |
| 11 | +func ValidateSchedules(schedules []string) error { |
| 12 | + for i := 0; i < len(schedules); i++ { |
| 13 | + for j := i + 1; j < len(schedules); j++ { |
| 14 | + overlap, err := SchedulesOverlap(schedules[i], schedules[j]) |
| 15 | + if err != nil { |
| 16 | + return xerrors.Errorf("invalid schedule: %w", err) |
| 17 | + } |
| 18 | + if overlap { |
| 19 | + return xerrors.Errorf("schedules overlap: %s and %s", |
| 20 | + schedules[i], schedules[j]) |
| 21 | + } |
| 22 | + } |
| 23 | + } |
| 24 | + return nil |
| 25 | +} |
| 26 | + |
| 27 | +// SchedulesOverlap checks if two schedules overlap by checking |
| 28 | +// all cron fields separately |
| 29 | +func SchedulesOverlap(schedule1, schedule2 string) (bool, error) { |
| 30 | + // Get cron fields |
| 31 | + fields1 := strings.Fields(schedule1) |
| 32 | + fields2 := strings.Fields(schedule2) |
| 33 | + |
| 34 | + if len(fields1) != 5 { |
| 35 | + return false, xerrors.Errorf("schedule %q has %d fields, expected 5 fields (minute hour day-of-month month day-of-week)", schedule1, len(fields1)) |
| 36 | + } |
| 37 | + if len(fields2) != 5 { |
| 38 | + return false, xerrors.Errorf("schedule %q has %d fields, expected 5 fields (minute hour day-of-month month day-of-week)", schedule2, len(fields2)) |
| 39 | + } |
| 40 | + |
| 41 | + // Check if months overlap |
| 42 | + monthsOverlap, err := MonthsOverlap(fields1[3], fields2[3]) |
| 43 | + if err != nil { |
| 44 | + return false, xerrors.Errorf("invalid month range: %w", err) |
| 45 | + } |
| 46 | + if !monthsOverlap { |
| 47 | + return false, nil |
| 48 | + } |
| 49 | + |
| 50 | + // Check if days overlap (DOM OR DOW) |
| 51 | + daysOverlap, err := DaysOverlap(fields1[2], fields1[4], fields2[2], fields2[4]) |
| 52 | + if err != nil { |
| 53 | + return false, xerrors.Errorf("invalid day range: %w", err) |
| 54 | + } |
| 55 | + if !daysOverlap { |
| 56 | + return false, nil |
| 57 | + } |
| 58 | + |
| 59 | + // Check if hours overlap |
| 60 | + hoursOverlap, err := HoursOverlap(fields1[1], fields2[1]) |
| 61 | + if err != nil { |
| 62 | + return false, xerrors.Errorf("invalid hour range: %w", err) |
| 63 | + } |
| 64 | + |
| 65 | + return hoursOverlap, nil |
| 66 | +} |
| 67 | + |
| 68 | +// MonthsOverlap checks if two month ranges overlap |
| 69 | +func MonthsOverlap(months1, months2 string) (bool, error) { |
| 70 | + return CheckOverlap(months1, months2, 12) |
| 71 | +} |
| 72 | + |
| 73 | +// HoursOverlap checks if two hour ranges overlap |
| 74 | +func HoursOverlap(hours1, hours2 string) (bool, error) { |
| 75 | + return CheckOverlap(hours1, hours2, 23) |
| 76 | +} |
| 77 | + |
| 78 | +// DomOverlap checks if two day-of-month ranges overlap |
| 79 | +func DomOverlap(dom1, dom2 string) (bool, error) { |
| 80 | + return CheckOverlap(dom1, dom2, 31) |
| 81 | +} |
| 82 | + |
| 83 | +// DowOverlap checks if two day-of-week ranges overlap |
| 84 | +func DowOverlap(dow1, dow2 string) (bool, error) { |
| 85 | + return CheckOverlap(dow1, dow2, 6) |
| 86 | +} |
| 87 | + |
| 88 | +// DaysOverlap checks if two day ranges overlap, considering both DOM and DOW. |
| 89 | +// Returns true if both DOM and DOW overlap, or if one is * and the other overlaps. |
| 90 | +func DaysOverlap(dom1, dow1, dom2, dow2 string) (bool, error) { |
| 91 | + // If either DOM is *, we only need to check DOW overlap |
| 92 | + if dom1 == "*" || dom2 == "*" { |
| 93 | + return DowOverlap(dow1, dow2) |
| 94 | + } |
| 95 | + |
| 96 | + // If either DOW is *, we only need to check DOM overlap |
| 97 | + if dow1 == "*" || dow2 == "*" { |
| 98 | + return DomOverlap(dom1, dom2) |
| 99 | + } |
| 100 | + |
| 101 | + // If both DOM and DOW are specified, we need to check both |
| 102 | + // because the schedule runs when either matches |
| 103 | + domOverlap, err := DomOverlap(dom1, dom2) |
| 104 | + if err != nil { |
| 105 | + return false, err |
| 106 | + } |
| 107 | + dowOverlap, err := DowOverlap(dow1, dow2) |
| 108 | + if err != nil { |
| 109 | + return false, err |
| 110 | + } |
| 111 | + |
| 112 | + // If either DOM or DOW overlaps, the schedules overlap |
| 113 | + return domOverlap || dowOverlap, nil |
| 114 | +} |
| 115 | + |
| 116 | +// CheckOverlap is a function to check if two ranges overlap |
| 117 | +func CheckOverlap(range1, range2 string, maxValue int) (bool, error) { |
| 118 | + set1, err := ParseRange(range1, maxValue) |
| 119 | + if err != nil { |
| 120 | + return false, err |
| 121 | + } |
| 122 | + set2, err := ParseRange(range2, maxValue) |
| 123 | + if err != nil { |
| 124 | + return false, err |
| 125 | + } |
| 126 | + |
| 127 | + for value := range set1 { |
| 128 | + if set2[value] { |
| 129 | + return true, nil |
| 130 | + } |
| 131 | + } |
| 132 | + return false, nil |
| 133 | +} |
| 134 | + |
| 135 | +// ParseRange converts a cron range to a set of integers |
| 136 | +// maxValue is the maximum allowed value (e.g., 23 for hours, 6 for DOW, 12 for months, 31 for DOM) |
| 137 | +func ParseRange(input string, maxValue int) (map[int]bool, error) { |
| 138 | + result := make(map[int]bool) |
| 139 | + |
| 140 | + // Handle "*" case |
| 141 | + if input == "*" { |
| 142 | + for i := 0; i <= maxValue; i++ { |
| 143 | + result[i] = true |
| 144 | + } |
| 145 | + return result, nil |
| 146 | + } |
| 147 | + |
| 148 | + // Parse ranges like "1-3,5,7-9" |
| 149 | + parts := strings.Split(input, ",") |
| 150 | + for _, part := range parts { |
| 151 | + if strings.Contains(part, "-") { |
| 152 | + // Handle range like "1-3" |
| 153 | + rangeParts := strings.Split(part, "-") |
| 154 | + start, err := strconv.Atoi(rangeParts[0]) |
| 155 | + if err != nil { |
| 156 | + return nil, xerrors.Errorf("invalid start value in range: %w", err) |
| 157 | + } |
| 158 | + end, err := strconv.Atoi(rangeParts[1]) |
| 159 | + if err != nil { |
| 160 | + return nil, xerrors.Errorf("invalid end value in range: %w", err) |
| 161 | + } |
| 162 | + |
| 163 | + // Validate range |
| 164 | + if start < 0 || end > maxValue || start > end { |
| 165 | + return nil, xerrors.Errorf("invalid range %d-%d: values must be between 0 and %d", start, end, maxValue) |
| 166 | + } |
| 167 | + |
| 168 | + for i := start; i <= end; i++ { |
| 169 | + result[i] = true |
| 170 | + } |
| 171 | + } else { |
| 172 | + // Handle single value |
| 173 | + value, err := strconv.Atoi(part) |
| 174 | + if err != nil { |
| 175 | + return nil, xerrors.Errorf("invalid value: %w", err) |
| 176 | + } |
| 177 | + |
| 178 | + // Validate value |
| 179 | + if value < 0 || value > maxValue { |
| 180 | + return nil, xerrors.Errorf("invalid value %d: must be between 0 and %d", value, maxValue) |
| 181 | + } |
| 182 | + |
| 183 | + result[value] = true |
| 184 | + } |
| 185 | + } |
| 186 | + return result, nil |
| 187 | +} |
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