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map.go
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207 lines (177 loc) · 3.92 KB
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package slog
import (
"bytes"
"database/sql/driver"
"encoding/json"
"fmt"
"reflect"
"strings"
"golang.org/x/xerrors"
)
// Map represents an ordered map of fields.
type Map []Field
var _ json.Marshaler = Map(nil)
// MarshalJSON implements json.Marshaler.
//
// It is guaranteed to return a nil error.
// Any error marshalling a field will become the field's value.
//
// Every field value is encoded with the following process:
//
// 1. json.Marshaller is handled.
//
// 2. xerrors.Formatter is handled.
//
// 3. structs that have a field with a json tag are encoded with json.Marshal.
//
// 4. error and fmt.Stringer is handled.
//
// 5. slices and arrays go through the encode function for every element.
//
// 6. For values that cannot be encoded with json.Marshal, fmt.Sprintf("%+v") is used.
//
// 7. json.Marshal(v) is used for all other values.
func (m Map) MarshalJSON() ([]byte, error) {
b := &bytes.Buffer{}
b.WriteByte('{')
for i, f := range m {
b.WriteByte('\n')
b.Write(encode(f.Name))
b.WriteByte(':')
b.Write(encode(f.Value))
if i < len(m)-1 {
b.WriteByte(',')
}
}
b.WriteByte('}')
return b.Bytes(), nil
}
func marshalList(rv reflect.Value) []byte {
b := &bytes.Buffer{}
b.WriteByte('[')
for i := 0; i < rv.Len(); i++ {
b.WriteByte('\n')
b.Write(encode(rv.Index(i).Interface()))
if i < rv.Len()-1 {
b.WriteByte(',')
}
}
b.WriteByte(']')
return b.Bytes()
}
func encode(v interface{}) []byte {
if vr, ok := v.(driver.Valuer); ok {
var err error
v, err = vr.Value()
if err != nil {
return encodeJSON(fmt.Sprintf("error calling Value: %v", err))
}
}
switch v := v.(type) {
case json.Marshaler:
return encodeJSON(v)
case xerrors.Formatter:
return encode(errorChain(v))
}
rv := reflect.Indirect(reflect.ValueOf(v))
if !rv.IsValid() {
return encodeJSON(v)
}
if rv.Kind() == reflect.Struct {
b, ok := encodeStruct(rv)
if ok {
return b
}
}
switch v.(type) {
case error, fmt.Stringer:
return encode(fmt.Sprint(v))
}
switch rv.Type().Kind() {
case reflect.Slice:
if !rv.IsNil() {
return marshalList(rv)
}
case reflect.Array:
return marshalList(rv)
case reflect.Struct, reflect.Chan, reflect.Complex64, reflect.Complex128, reflect.Func:
// These types cannot be directly encoded with json.Marshal.
// See https://golang.org/pkg/encoding/json/#Marshal
return encodeJSON(fmt.Sprintf("%+v", v))
}
return encodeJSON(v)
}
func encodeStruct(rv reflect.Value) ([]byte, bool) {
if rv.Kind() == reflect.Struct {
for i := 0; i < rv.NumField(); i++ {
ft := rv.Type().Field(i)
// Found a field with a json tag.
if ft.Tag.Get("json") != "" {
return encodeJSON(rv.Interface()), true
}
}
}
return nil, false
}
func encodeJSON(v interface{}) []byte {
b, err := json.Marshal(v)
if err != nil {
return encode(M(
Error(xerrors.Errorf("failed to marshal to JSON: %w", err)),
F("type", reflect.TypeOf(v)),
F("value", fmt.Sprintf("%+v", v)),
))
}
return b
}
func errorChain(f xerrors.Formatter) []interface{} {
var errs []interface{}
next := error(f)
for {
f, ok := next.(xerrors.Formatter)
if !ok {
errs = append(errs, next)
return errs
}
p := &xerrorPrinter{}
next = f.FormatError(p)
errs = append(errs, p.e)
}
}
type wrapError struct {
Msg string `json:"msg"`
Fun string `json:"fun"`
// file:line
Loc string `json:"loc"`
}
type xerrorPrinter struct {
e wrapError
}
func (p *xerrorPrinter) Print(v ...interface{}) {
s := fmt.Sprint(v...)
p.write(s)
}
func (p *xerrorPrinter) Printf(f string, v ...interface{}) {
s := fmt.Sprintf(f, v...)
p.write(s)
}
func (p *xerrorPrinter) Detail() bool {
return true
}
func (p *xerrorPrinter) write(s string) {
s = strings.TrimSpace(s)
switch {
case p.e.Msg == "":
p.e.Msg = s
case p.e.Fun == "":
p.e.Fun = s
case p.e.Loc == "":
p.e.Loc = s
}
}
func (m Map) append(m2 Map) Map {
m3 := make(Map, 0, len(m)+len(m2))
m3 = append(m3, m...)
m3 = append(m3, m2...)
return m3
}