util.go

Documentation: github.com/opentracing/opentracing-go/log

     1  package log
     2  
     3  import (
     4  	"fmt"
     5  	"reflect"
     6  )
     7  
     8  // InterleavedKVToFields converts keyValues a la Span.LogKV() to a Field slice
     9  // a la Span.LogFields().
    10  func InterleavedKVToFields(keyValues ...interface{}) ([]Field, error) {
    11  	if len(keyValues)%2 != 0 {
    12  		return nil, fmt.Errorf("non-even keyValues len: %d", len(keyValues))
    13  	}
    14  	fields := make([]Field, len(keyValues)/2)
    15  	for i := 0; i*2 < len(keyValues); i++ {
    16  		key, ok := keyValues[i*2].(string)
    17  		if !ok {
    18  			return nil, fmt.Errorf(
    19  				"non-string key (pair #%d): %T",
    20  				i, keyValues[i*2])
    21  		}
    22  		switch typedVal := keyValues[i*2+1].(type) {
    23  		case bool:
    24  			fields[i] = Bool(key, typedVal)
    25  		case string:
    26  			fields[i] = String(key, typedVal)
    27  		case int:
    28  			fields[i] = Int(key, typedVal)
    29  		case int8:
    30  			fields[i] = Int32(key, int32(typedVal))
    31  		case int16:
    32  			fields[i] = Int32(key, int32(typedVal))
    33  		case int32:
    34  			fields[i] = Int32(key, typedVal)
    35  		case int64:
    36  			fields[i] = Int64(key, typedVal)
    37  		case uint:
    38  			fields[i] = Uint64(key, uint64(typedVal))
    39  		case uint64:
    40  			fields[i] = Uint64(key, typedVal)
    41  		case uint8:
    42  			fields[i] = Uint32(key, uint32(typedVal))
    43  		case uint16:
    44  			fields[i] = Uint32(key, uint32(typedVal))
    45  		case uint32:
    46  			fields[i] = Uint32(key, typedVal)
    47  		case float32:
    48  			fields[i] = Float32(key, typedVal)
    49  		case float64:
    50  			fields[i] = Float64(key, typedVal)
    51  		default:
    52  			if typedVal == nil || (reflect.ValueOf(typedVal).Kind() == reflect.Ptr && reflect.ValueOf(typedVal).IsNil()) {
    53  				fields[i] = String(key, "nil")
    54  				continue
    55  			}
    56  			// When in doubt, coerce to a string
    57  			fields[i] = String(key, fmt.Sprint(typedVal))
    58  		}
    59  	}
    60  	return fields, nil
    61  }
    62
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