forked from zrepl/zrepl
/
logging_formatters.go
220 lines (180 loc) · 4.64 KB
/
logging_formatters.go
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package logging
import (
"bytes"
"encoding/json"
"fmt"
"time"
"github.com/fatih/color"
"github.com/go-logfmt/logfmt"
"github.com/pkg/errors"
"github.com/zrepl/zrepl/logger"
)
const (
FieldLevel = "level"
FieldMessage = "msg"
FieldTime = "time"
)
const (
JobField string = "job"
SubsysField string = "subsystem"
)
type MetadataFlags int64
const (
MetadataTime MetadataFlags = 1 << iota
MetadataLevel
MetadataColor
MetadataNone MetadataFlags = 0
MetadataAll MetadataFlags = ^0
)
type NoFormatter struct{}
func (f NoFormatter) SetMetadataFlags(flags MetadataFlags) {}
func (f NoFormatter) Format(e *logger.Entry) ([]byte, error) {
return []byte(e.Message), nil
}
type HumanFormatter struct {
metadataFlags MetadataFlags
ignoreFields map[string]bool
}
const HumanFormatterDateFormat = time.RFC3339
func (f *HumanFormatter) SetMetadataFlags(flags MetadataFlags) {
f.metadataFlags = flags
}
func (f *HumanFormatter) SetIgnoreFields(ignore []string) {
if ignore == nil {
f.ignoreFields = nil
return
}
f.ignoreFields = make(map[string]bool, len(ignore))
for _, field := range ignore {
f.ignoreFields[field] = true
}
}
func (f *HumanFormatter) ignored(field string) bool {
return f.ignoreFields != nil && f.ignoreFields[field]
}
func (f *HumanFormatter) Format(e *logger.Entry) (out []byte, err error) {
var line bytes.Buffer
col := color.New()
if f.metadataFlags&MetadataColor != 0 {
col = e.Color()
}
if f.metadataFlags&MetadataTime != 0 {
fmt.Fprintf(&line, "%s ", e.Time.Format(HumanFormatterDateFormat))
}
if f.metadataFlags&MetadataLevel != 0 {
fmt.Fprintf(&line, "[%s]", col.Sprint(e.Level.Short()))
}
prefixFields := []string{JobField, SubsysField}
prefixed := make(map[string]bool, len(prefixFields)+2)
for _, field := range prefixFields {
val, ok := e.Fields[field].(string)
if !ok {
continue
}
if !f.ignored(field) {
fmt.Fprintf(&line, "[%s]", col.Sprint(val))
prefixed[field] = true
}
}
if line.Len() > 0 {
fmt.Fprint(&line, ": ")
}
fmt.Fprint(&line, e.Message)
if len(e.Fields)-len(prefixed) > 0 {
for field, value := range e.Fields {
if prefixed[field] || f.ignored(field) {
continue
}
fmt.Fprintf(&line, " %s=%q", col.Sprint(field), fmt.Sprint(value))
}
}
return line.Bytes(), nil
}
type JSONFormatter struct {
metadataFlags MetadataFlags
}
func (f *JSONFormatter) SetMetadataFlags(flags MetadataFlags) {
f.metadataFlags = flags
}
func (f *JSONFormatter) Format(e *logger.Entry) ([]byte, error) {
data := make(logger.Fields, len(e.Fields)+3)
for k, v := range e.Fields {
switch v := v.(type) {
case error:
// Otherwise errors are ignored by `encoding/json`
// https://github.com/sirupsen/logrus/issues/137
data[k] = v.Error()
default:
_, err := json.Marshal(v)
if err != nil {
return nil, errors.Errorf("field is not JSON encodable: %s", k)
}
data[k] = v
}
}
data[FieldMessage] = e.Message
data[FieldTime] = e.Time.Format(time.RFC3339)
data[FieldLevel] = e.Level
return json.Marshal(data)
}
type LogfmtFormatter struct {
metadataFlags MetadataFlags
}
func (f *LogfmtFormatter) SetMetadataFlags(flags MetadataFlags) {
f.metadataFlags = flags
}
func (f *LogfmtFormatter) Format(e *logger.Entry) ([]byte, error) {
var buf bytes.Buffer
enc := logfmt.NewEncoder(&buf)
if f.metadataFlags&MetadataTime != 0 {
err := enc.EncodeKeyval(FieldTime, e.Time)
if err != nil {
return nil, errors.Wrap(err, "logfmt: encode time")
}
}
if f.metadataFlags&MetadataLevel != 0 {
err := enc.EncodeKeyval(FieldLevel, e.Level)
if err != nil {
return nil, errors.Wrap(err, "logfmt: encode level")
}
}
// at least try and put job and task in front
prefixed := make(map[string]bool, 2)
prefix := []string{JobField, SubsysField}
for _, pf := range prefix {
v, ok := e.Fields[pf]
if !ok {
break
}
if err := logfmtTryEncodeKeyval(enc, pf, v); err != nil {
return nil, err // unlikely
}
prefixed[pf] = true
}
err := enc.EncodeKeyval(FieldMessage, e.Message)
if err != nil {
return nil, errors.Wrap(err, "logfmt: encode message")
}
for k, v := range e.Fields {
if !prefixed[k] {
if err := logfmtTryEncodeKeyval(enc, k, v); err != nil {
return nil, err
}
}
}
return buf.Bytes(), nil
}
func logfmtTryEncodeKeyval(enc *logfmt.Encoder, field, value interface{}) error {
err := enc.EncodeKeyval(field, value)
switch err {
case nil: // ok
return nil
case logfmt.ErrUnsupportedValueType:
err := enc.EncodeKeyval(field, fmt.Sprintf("<%T>", value))
if err != nil {
return errors.Wrap(err, "cannot encode unsuuported value type Go type")
}
return nil
}
return errors.Wrapf(err, "cannot encode field '%s'", field)
}