|
| 1 | +package proxy |
| 2 | + |
| 3 | +import ( |
| 4 | + "net/url" |
| 5 | + "strconv" |
| 6 | + "strings" |
| 7 | + |
| 8 | + "github.com/ethpandaops/lab-backend/internal/wallclock" |
| 9 | + "github.com/sirupsen/logrus" |
| 10 | +) |
| 11 | + |
| 12 | +// transformQueryParams transforms slot_* filters to slot_start_date_time_* filters. |
| 13 | +// Returns the original query string if transformation fails (fail-open). |
| 14 | +func transformQueryParams( |
| 15 | + logger logrus.FieldLogger, |
| 16 | + networkName string, |
| 17 | + wallclockSvc *wallclock.Service, |
| 18 | + originalQuery string, |
| 19 | +) string { |
| 20 | + // If no wallclock service or empty query, return original |
| 21 | + if wallclockSvc == nil || originalQuery == "" { |
| 22 | + return originalQuery |
| 23 | + } |
| 24 | + |
| 25 | + // Parse query string |
| 26 | + values, err := url.ParseQuery(originalQuery) |
| 27 | + if err != nil { |
| 28 | + logger.WithFields(logrus.Fields{ |
| 29 | + "network": networkName, |
| 30 | + "query": originalQuery, |
| 31 | + "error": err.Error(), |
| 32 | + }).Warn("Failed to parse query string, using original") |
| 33 | + |
| 34 | + return originalQuery |
| 35 | + } |
| 36 | + |
| 37 | + // Track if any transformations were made |
| 38 | + transformed := false |
| 39 | + transformedValues := make(url.Values) |
| 40 | + |
| 41 | + // Iterate over each parameter |
| 42 | + for key, valuesSlice := range values { |
| 43 | + // Check if this is a slot filter |
| 44 | + isSlot, operator, slotValue := detectSlotFilter(key, valuesSlice) |
| 45 | + |
| 46 | + if !isSlot { |
| 47 | + // Not a slot filter, copy as-is |
| 48 | + transformedValues[key] = valuesSlice |
| 49 | + |
| 50 | + continue |
| 51 | + } |
| 52 | + |
| 53 | + // Calculate slot_start_date_time |
| 54 | + slotStartTime := wallclockSvc.CalculateSlotStartTime(networkName, slotValue) |
| 55 | + |
| 56 | + if slotStartTime == 0 { |
| 57 | + // Wallclock unavailable or calculation failed, keep original slot filter |
| 58 | + logger.WithFields(logrus.Fields{ |
| 59 | + "network": networkName, |
| 60 | + "slot": slotValue, |
| 61 | + }).Warn("Failed to calculate slot start time, using original slot filter") |
| 62 | + |
| 63 | + transformedValues[key] = valuesSlice |
| 64 | + |
| 65 | + continue |
| 66 | + } |
| 67 | + |
| 68 | + // Replace slot_* with slot_start_date_time_* |
| 69 | + newKey := "slot_start_date_time_" + operator |
| 70 | + transformedValues[newKey] = []string{strconv.FormatUint(uint64(slotStartTime), 10)} |
| 71 | + transformed = true |
| 72 | + |
| 73 | + logger.WithFields(logrus.Fields{ |
| 74 | + "network": networkName, |
| 75 | + "slot": slotValue, |
| 76 | + "slot_start_date_time": slotStartTime, |
| 77 | + "operator": operator, |
| 78 | + }).Debug("Transformed slot filter to slot_start_date_time") |
| 79 | + } |
| 80 | + |
| 81 | + // If no transformations were made, return original |
| 82 | + if !transformed { |
| 83 | + return originalQuery |
| 84 | + } |
| 85 | + |
| 86 | + // Return transformed query string |
| 87 | + return transformedValues.Encode() |
| 88 | +} |
| 89 | + |
| 90 | +// detectSlotFilter checks if a query parameter is a slot filter. |
| 91 | +// Returns: isSlotFilter, operator (e.g., "eq", "gte"), value. |
| 92 | +func detectSlotFilter(key string, values []string) (bool, string, uint64) { |
| 93 | + // Check if key starts with "slot_" |
| 94 | + if !strings.HasPrefix(key, "slot_") { |
| 95 | + return false, "", 0 |
| 96 | + } |
| 97 | + |
| 98 | + // If no values, not a valid filter |
| 99 | + if len(values) == 0 { |
| 100 | + return false, "", 0 |
| 101 | + } |
| 102 | + |
| 103 | + // Extract operator from key |
| 104 | + operator := strings.TrimPrefix(key, "slot_") |
| 105 | + |
| 106 | + // Validate operator |
| 107 | + switch operator { |
| 108 | + case "eq", "gte", "lte", "gt", "lt": |
| 109 | + // Valid operator |
| 110 | + default: |
| 111 | + // Unknown operator |
| 112 | + return false, "", 0 |
| 113 | + } |
| 114 | + |
| 115 | + // Parse slot value |
| 116 | + slotValue, err := strconv.ParseUint(values[0], 10, 64) |
| 117 | + if err != nil { |
| 118 | + // Invalid slot value |
| 119 | + return false, "", 0 |
| 120 | + } |
| 121 | + |
| 122 | + return true, operator, slotValue |
| 123 | +} |
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