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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package zapcore
import (
"bytes"
"fmt"
"math"
"reflect"
"time"
)
// A FieldType indicates which member of the Field union struct should be used
// and how it should be serialized.
type FieldType uint8
const (
// UnknownType is the default field type. Attempting to add it to an encoder will panic.
UnknownType FieldType = iota
// ArrayMarshalerType indicates that the field carries an ArrayMarshaler.
ArrayMarshalerType
// ObjectMarshalerType indicates that the field carries an ObjectMarshaler.
ObjectMarshalerType
// BinaryType indicates that the field carries an opaque binary blob.
BinaryType
// BoolType indicates that the field carries a bool.
BoolType
// ByteStringType indicates that the field carries UTF-8 encoded bytes.
ByteStringType
// Complex128Type indicates that the field carries a complex128.
Complex128Type
// Complex64Type indicates that the field carries a complex128.
Complex64Type
// DurationType indicates that the field carries a time.Duration.
DurationType
// Float64Type indicates that the field carries a float64.
Float64Type
// Float32Type indicates that the field carries a float32.
Float32Type
// Int64Type indicates that the field carries an int64.
Int64Type
// Int32Type indicates that the field carries an int32.
Int32Type
// Int16Type indicates that the field carries an int16.
Int16Type
// Int8Type indicates that the field carries an int8.
Int8Type
// StringType indicates that the field carries a string.
StringType
// TimeType indicates that the field carries a time.Time that is
// representable by a UnixNano() stored as an int64.
TimeType
// TimeFullType indicates that the field carries a time.Time stored as-is.
TimeFullType
// Uint64Type indicates that the field carries a uint64.
Uint64Type
// Uint32Type indicates that the field carries a uint32.
Uint32Type
// Uint16Type indicates that the field carries a uint16.
Uint16Type
// Uint8Type indicates that the field carries a uint8.
Uint8Type
// UintptrType indicates that the field carries a uintptr.
UintptrType
// ReflectType indicates that the field carries an interface{}, which should
// be serialized using reflection.
ReflectType
// NamespaceType signals the beginning of an isolated namespace. All
// subsequent fields should be added to the new namespace.
NamespaceType
// StringerType indicates that the field carries a fmt.Stringer.
StringerType
// ErrorType indicates that the field carries an error.
ErrorType
// SkipType indicates that the field is a no-op.
SkipType
)
// A Field is a marshaling operation used to add a key-value pair to a logger's
// context. Most fields are lazily marshaled, so it's inexpensive to add fields
// to disabled debug-level log statements.
type Field struct {
Key string
Type FieldType
Integer int64
String string
Interface interface{}
}
// AddTo exports a field through the ObjectEncoder interface. It's primarily
// useful to library authors, and shouldn't be necessary in most applications.
func (f Field) AddTo(enc ObjectEncoder) {
var err error
switch f.Type {
case ArrayMarshalerType:
err = enc.AddArray(f.Key, f.Interface.(ArrayMarshaler))
case ObjectMarshalerType:
err = enc.AddObject(f.Key, f.Interface.(ObjectMarshaler))
case BinaryType:
enc.AddBinary(f.Key, f.Interface.([]byte))
case BoolType:
enc.AddBool(f.Key, f.Integer == 1)
case ByteStringType:
enc.AddByteString(f.Key, f.Interface.([]byte))
case Complex128Type:
enc.AddComplex128(f.Key, f.Interface.(complex128))
case Complex64Type:
enc.AddComplex64(f.Key, f.Interface.(complex64))
case DurationType:
enc.AddDuration(f.Key, time.Duration(f.Integer))
case Float64Type:
enc.AddFloat64(f.Key, math.Float64frombits(uint64(f.Integer)))
case Float32Type:
enc.AddFloat32(f.Key, math.Float32frombits(uint32(f.Integer)))
case Int64Type:
enc.AddInt64(f.Key, f.Integer)
case Int32Type:
enc.AddInt32(f.Key, int32(f.Integer))
case Int16Type:
enc.AddInt16(f.Key, int16(f.Integer))
case Int8Type:
enc.AddInt8(f.Key, int8(f.Integer))
case StringType:
enc.AddString(f.Key, f.String)
case TimeType:
if f.Interface != nil {
enc.AddTime(f.Key, time.Unix(0, f.Integer).In(f.Interface.(*time.Location)))
} else {
// Fall back to UTC if location is nil.
enc.AddTime(f.Key, time.Unix(0, f.Integer))
}
case TimeFullType:
enc.AddTime(f.Key, f.Interface.(time.Time))
case Uint64Type:
enc.AddUint64(f.Key, uint64(f.Integer))
case Uint32Type:
enc.AddUint32(f.Key, uint32(f.Integer))
case Uint16Type:
enc.AddUint16(f.Key, uint16(f.Integer))
case Uint8Type:
enc.AddUint8(f.Key, uint8(f.Integer))
case UintptrType:
enc.AddUintptr(f.Key, uintptr(f.Integer))
case ReflectType:
err = enc.AddReflected(f.Key, f.Interface)
case NamespaceType:
enc.OpenNamespace(f.Key)
case StringerType:
err = encodeStringer(f.Key, f.Interface, enc)
case ErrorType:
encodeError(f.Key, f.Interface.(error), enc)
case SkipType:
break
default:
panic(fmt.Sprintf("unknown field type: %v", f))
}
if err != nil {
enc.AddString(fmt.Sprintf("%sError", f.Key), err.Error())
}
}
// Equals returns whether two fields are equal. For non-primitive types such as
// errors, marshalers, or reflect types, it uses reflect.DeepEqual.
func (f Field) Equals(other Field) bool {
if f.Type != other.Type {
return false
}
if f.Key != other.Key {
return false
}
switch f.Type {
case BinaryType, ByteStringType:
return bytes.Equal(f.Interface.([]byte), other.Interface.([]byte))
case ArrayMarshalerType, ObjectMarshalerType, ErrorType, ReflectType:
return reflect.DeepEqual(f.Interface, other.Interface)
default:
return f == other
}
}
func addFields(enc ObjectEncoder, fields []Field) {
for i := range fields {
fields[i].AddTo(enc)
}
}
func encodeStringer(key string, stringer interface{}, enc ObjectEncoder) (retErr error) {
// Try to capture panics (from nil references or otherwise) when calling
// the String() method, similar to https://golang.org/src/fmt/print.go#L540
defer func() {
if err := recover(); err != nil {
// If it's a nil pointer, just say "<nil>". The likeliest causes are a
// Stringer that fails to guard against nil or a nil pointer for a
// value receiver, and in either case, "<nil>" is a nice result.
if v := reflect.ValueOf(stringer); v.Kind() == reflect.Ptr && v.IsNil() {
enc.AddString(key, "<nil>")
return
}
retErr = fmt.Errorf("PANIC=%v", err)
}
}()
enc.AddString(key, stringer.(fmt.Stringer).String())
return nil
}
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