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- package log
- import (
- "fmt"
- "reflect"
- )
- // InterleavedKVToFields converts keyValues a la Span.LogKV() to a Field slice
- // a la Span.LogFields().
- func InterleavedKVToFields(keyValues ...interface{}) ([]Field, error) {
- if len(keyValues)%2 != 0 {
- return nil, fmt.Errorf("non-even keyValues len: %d", len(keyValues))
- }
- fields := make([]Field, len(keyValues)/2)
- for i := 0; i*2 < len(keyValues); i++ {
- key, ok := keyValues[i*2].(string)
- if !ok {
- return nil, fmt.Errorf(
- "non-string key (pair #%d): %T",
- i, keyValues[i*2])
- }
- switch typedVal := keyValues[i*2+1].(type) {
- case bool:
- fields[i] = Bool(key, typedVal)
- case string:
- fields[i] = String(key, typedVal)
- case int:
- fields[i] = Int(key, typedVal)
- case int8:
- fields[i] = Int32(key, int32(typedVal))
- case int16:
- fields[i] = Int32(key, int32(typedVal))
- case int32:
- fields[i] = Int32(key, typedVal)
- case int64:
- fields[i] = Int64(key, typedVal)
- case uint:
- fields[i] = Uint64(key, uint64(typedVal))
- case uint64:
- fields[i] = Uint64(key, typedVal)
- case uint8:
- fields[i] = Uint32(key, uint32(typedVal))
- case uint16:
- fields[i] = Uint32(key, uint32(typedVal))
- case uint32:
- fields[i] = Uint32(key, typedVal)
- case float32:
- fields[i] = Float32(key, typedVal)
- case float64:
- fields[i] = Float64(key, typedVal)
- default:
- if typedVal == nil || (reflect.ValueOf(typedVal).Kind() == reflect.Ptr && reflect.ValueOf(typedVal).IsNil()) {
- fields[i] = String(key, "nil")
- continue
- }
- // When in doubt, coerce to a string
- fields[i] = String(key, fmt.Sprint(typedVal))
- }
- }
- return fields, nil
- }
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