plugeth/log/format.go

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package log
import (
"bytes"
"encoding/json"
"fmt"
"math/big"
"reflect"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"unicode/utf8"
)
const (
timeFormat = "2006-01-02T15:04:05-0700"
termTimeFormat = "01-02|15:04:05.000"
floatFormat = 'f'
termMsgJust = 40
termCtxMaxPadding = 40
)
// locationTrims are trimmed for display to avoid unwieldy log lines.
var locationTrims = []string{
"github.com/ethereum/go-ethereum/",
}
// PrintOrigins sets or unsets log location (file:line) printing for terminal
// format output.
func PrintOrigins(print bool) {
if print {
atomic.StoreUint32(&locationEnabled, 1)
} else {
atomic.StoreUint32(&locationEnabled, 0)
}
}
// locationEnabled is an atomic flag controlling whether the terminal formatter
// should append the log locations too when printing entries.
var locationEnabled uint32
// locationLength is the maxmimum path length encountered, which all logs are
// padded to to aid in alignment.
var locationLength uint32
// fieldPadding is a global map with maximum field value lengths seen until now
// to allow padding log contexts in a bit smarter way.
var fieldPadding = make(map[string]int)
// fieldPaddingLock is a global mutex protecting the field padding map.
var fieldPaddingLock sync.RWMutex
type Format interface {
Format(r *Record) []byte
}
// FormatFunc returns a new Format object which uses
// the given function to perform record formatting.
func FormatFunc(f func(*Record) []byte) Format {
return formatFunc(f)
}
type formatFunc func(*Record) []byte
func (f formatFunc) Format(r *Record) []byte {
return f(r)
}
// TerminalStringer is an analogous interface to the stdlib stringer, allowing
// own types to have custom shortened serialization formats when printed to the
// screen.
type TerminalStringer interface {
TerminalString() string
}
// TerminalFormat formats log records optimized for human readability on
// a terminal with color-coded level output and terser human friendly timestamp.
// This format should only be used for interactive programs or while developing.
//
// [LEVEL] [TIME] MESSAGE key=value key=value ...
//
// Example:
//
// [DBUG] [May 16 20:58:45] remove route ns=haproxy addr=127.0.0.1:50002
func TerminalFormat(usecolor bool) Format {
return FormatFunc(func(r *Record) []byte {
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msg := escapeMessage(r.Msg)
var color = 0
if usecolor {
switch r.Lvl {
case LvlCrit:
color = 35
case LvlError:
color = 31
case LvlWarn:
color = 33
case LvlInfo:
color = 32
case LvlDebug:
color = 36
case LvlTrace:
color = 34
}
}
b := &bytes.Buffer{}
lvl := r.Lvl.AlignedString()
if atomic.LoadUint32(&locationEnabled) != 0 {
// Log origin printing was requested, format the location path and line number
location := fmt.Sprintf("%+v", r.Call)
for _, prefix := range locationTrims {
location = strings.TrimPrefix(location, prefix)
}
// Maintain the maximum location length for fancyer alignment
align := int(atomic.LoadUint32(&locationLength))
if align < len(location) {
align = len(location)
atomic.StoreUint32(&locationLength, uint32(align))
}
padding := strings.Repeat(" ", align-len(location))
// Assemble and print the log heading
if color > 0 {
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fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s|%s]%s %s ", color, lvl, r.Time.Format(termTimeFormat), location, padding, msg)
} else {
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fmt.Fprintf(b, "%s[%s|%s]%s %s ", lvl, r.Time.Format(termTimeFormat), location, padding, msg)
}
} else {
if color > 0 {
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fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s] %s ", color, lvl, r.Time.Format(termTimeFormat), msg)
} else {
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fmt.Fprintf(b, "%s[%s] %s ", lvl, r.Time.Format(termTimeFormat), msg)
}
}
// try to justify the log output for short messages
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length := utf8.RuneCountInString(msg)
if len(r.Ctx) > 0 && length < termMsgJust {
b.Write(bytes.Repeat([]byte{' '}, termMsgJust-length))
}
// print the keys logfmt style
logfmt(b, r.Ctx, color, true)
return b.Bytes()
})
}
// LogfmtFormat prints records in logfmt format, an easy machine-parseable but human-readable
// format for key/value pairs.
//
// For more details see: http://godoc.org/github.com/kr/logfmt
func LogfmtFormat() Format {
return FormatFunc(func(r *Record) []byte {
common := []interface{}{r.KeyNames.Time, r.Time, r.KeyNames.Lvl, r.Lvl, r.KeyNames.Msg, r.Msg}
buf := &bytes.Buffer{}
logfmt(buf, append(common, r.Ctx...), 0, false)
return buf.Bytes()
})
}
func logfmt(buf *bytes.Buffer, ctx []interface{}, color int, term bool) {
for i := 0; i < len(ctx); i += 2 {
if i != 0 {
buf.WriteByte(' ')
}
k, ok := ctx[i].(string)
v := formatLogfmtValue(ctx[i+1], term)
if !ok {
k, v = errorKey, formatLogfmtValue(k, term)
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} else {
k = escapeString(k)
}
// XXX: we should probably check that all of your key bytes aren't invalid
fieldPaddingLock.RLock()
padding := fieldPadding[k]
fieldPaddingLock.RUnlock()
length := utf8.RuneCountInString(v)
if padding < length && length <= termCtxMaxPadding {
padding = length
fieldPaddingLock.Lock()
fieldPadding[k] = padding
fieldPaddingLock.Unlock()
}
if color > 0 {
fmt.Fprintf(buf, "\x1b[%dm%s\x1b[0m=", color, k)
} else {
buf.WriteString(k)
buf.WriteByte('=')
}
buf.WriteString(v)
if i < len(ctx)-2 && padding > length {
buf.Write(bytes.Repeat([]byte{' '}, padding-length))
}
}
buf.WriteByte('\n')
}
// JSONFormat formats log records as JSON objects separated by newlines.
// It is the equivalent of JSONFormatEx(false, true).
func JSONFormat() Format {
return JSONFormatEx(false, true)
}
// JSONFormatOrderedEx formats log records as JSON arrays. If pretty is true,
// records will be pretty-printed. If lineSeparated is true, records
// will be logged with a new line between each record.
func JSONFormatOrderedEx(pretty, lineSeparated bool) Format {
jsonMarshal := json.Marshal
if pretty {
jsonMarshal = func(v interface{}) ([]byte, error) {
return json.MarshalIndent(v, "", " ")
}
}
return FormatFunc(func(r *Record) []byte {
props := make(map[string]interface{})
props[r.KeyNames.Time] = r.Time
props[r.KeyNames.Lvl] = r.Lvl.String()
props[r.KeyNames.Msg] = r.Msg
ctx := make([]string, len(r.Ctx))
for i := 0; i < len(r.Ctx); i += 2 {
k, ok := r.Ctx[i].(string)
if !ok {
props[errorKey] = fmt.Sprintf("%+v is not a string key,", r.Ctx[i])
}
ctx[i] = k
ctx[i+1] = formatLogfmtValue(r.Ctx[i+1], true)
}
props[r.KeyNames.Ctx] = ctx
b, err := jsonMarshal(props)
if err != nil {
b, _ = jsonMarshal(map[string]string{
errorKey: err.Error(),
})
return b
}
if lineSeparated {
b = append(b, '\n')
}
return b
})
}
// JSONFormatEx formats log records as JSON objects. If pretty is true,
// records will be pretty-printed. If lineSeparated is true, records
// will be logged with a new line between each record.
func JSONFormatEx(pretty, lineSeparated bool) Format {
jsonMarshal := json.Marshal
if pretty {
jsonMarshal = func(v interface{}) ([]byte, error) {
return json.MarshalIndent(v, "", " ")
}
}
return FormatFunc(func(r *Record) []byte {
props := make(map[string]interface{})
props[r.KeyNames.Time] = r.Time
props[r.KeyNames.Lvl] = r.Lvl.String()
props[r.KeyNames.Msg] = r.Msg
for i := 0; i < len(r.Ctx); i += 2 {
k, ok := r.Ctx[i].(string)
if !ok {
props[errorKey] = fmt.Sprintf("%+v is not a string key", r.Ctx[i])
}
props[k] = formatJSONValue(r.Ctx[i+1])
}
b, err := jsonMarshal(props)
if err != nil {
b, _ = jsonMarshal(map[string]string{
errorKey: err.Error(),
})
return b
}
if lineSeparated {
b = append(b, '\n')
}
return b
})
}
func formatShared(value interface{}) (result interface{}) {
defer func() {
if err := recover(); err != nil {
if v := reflect.ValueOf(value); v.Kind() == reflect.Ptr && v.IsNil() {
result = "nil"
} else {
panic(err)
}
}
}()
switch v := value.(type) {
case time.Time:
return v.Format(timeFormat)
case error:
return v.Error()
case fmt.Stringer:
return v.String()
default:
return v
}
}
func formatJSONValue(value interface{}) interface{} {
value = formatShared(value)
switch value.(type) {
case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string:
return value
default:
return fmt.Sprintf("%+v", value)
}
}
// formatValue formats a value for serialization
func formatLogfmtValue(value interface{}, term bool) string {
if value == nil {
return "nil"
}
switch v := value.(type) {
case time.Time:
// Performance optimization: No need for escaping since the provided
// timeFormat doesn't have any escape characters, and escaping is
// expensive.
return v.Format(timeFormat)
case *big.Int:
// Big ints get consumed by the Stringer clause so we need to handle
// them earlier on.
if v == nil {
return "<nil>"
}
return formatLogfmtBigInt(v)
}
if term {
if s, ok := value.(TerminalStringer); ok {
// Custom terminal stringer provided, use that
return escapeString(s.TerminalString())
}
}
value = formatShared(value)
switch v := value.(type) {
case bool:
return strconv.FormatBool(v)
case float32:
return strconv.FormatFloat(float64(v), floatFormat, 3, 64)
case float64:
return strconv.FormatFloat(v, floatFormat, 3, 64)
case int8:
return strconv.FormatInt(int64(v), 10)
case uint8:
return strconv.FormatInt(int64(v), 10)
case int16:
return strconv.FormatInt(int64(v), 10)
case uint16:
return strconv.FormatInt(int64(v), 10)
// Larger integers get thousands separators.
case int:
return FormatLogfmtInt64(int64(v))
case int32:
return FormatLogfmtInt64(int64(v))
case int64:
return FormatLogfmtInt64(v)
case uint:
return FormatLogfmtUint64(uint64(v))
case uint32:
return FormatLogfmtUint64(uint64(v))
case uint64:
return FormatLogfmtUint64(v)
case string:
return escapeString(v)
default:
return escapeString(fmt.Sprintf("%+v", value))
}
}
// FormatLogfmtInt64 formats n with thousand separators.
func FormatLogfmtInt64(n int64) string {
if n < 0 {
return formatLogfmtUint64(uint64(-n), true)
}
return formatLogfmtUint64(uint64(n), false)
}
// FormatLogfmtUint64 formats n with thousand separators.
func FormatLogfmtUint64(n uint64) string {
return formatLogfmtUint64(n, false)
}
func formatLogfmtUint64(n uint64, neg bool) string {
// Small numbers are fine as is
if n < 100000 {
if neg {
return strconv.Itoa(-int(n))
} else {
return strconv.Itoa(int(n))
}
}
// Large numbers should be split
const maxLength = 26
var (
out = make([]byte, maxLength)
i = maxLength - 1
comma = 0
)
for ; n > 0; i-- {
if comma == 3 {
comma = 0
out[i] = ','
} else {
comma++
out[i] = '0' + byte(n%10)
n /= 10
}
}
if neg {
out[i] = '-'
i--
}
return string(out[i+1:])
}
// formatLogfmtBigInt formats n with thousand separators.
func formatLogfmtBigInt(n *big.Int) string {
if n.IsUint64() {
return FormatLogfmtUint64(n.Uint64())
}
if n.IsInt64() {
return FormatLogfmtInt64(n.Int64())
}
var (
text = n.String()
buf = make([]byte, len(text)+len(text)/3)
comma = 0
i = len(buf) - 1
)
for j := len(text) - 1; j >= 0; j, i = j-1, i-1 {
c := text[j]
switch {
case c == '-':
buf[i] = c
case comma == 3:
buf[i] = ','
i--
comma = 0
fallthrough
default:
buf[i] = c
comma++
}
}
return string(buf[i+1:])
}
// escapeString checks if the provided string needs escaping/quoting, and
// calls strconv.Quote if needed
func escapeString(s string) string {
needsQuoting := false
for _, r := range s {
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// We quote everything below " (0x22) and above~ (0x7E), plus equal-sign
if r <= '"' || r > '~' || r == '=' {
needsQuoting = true
break
}
}
if !needsQuoting {
return s
}
return strconv.Quote(s)
}
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// escapeMessage checks if the provided string needs escaping/quoting, similarly
// to escapeString. The difference is that this method is more lenient: it allows
// for spaces and linebreaks to occur without needing quoting.
func escapeMessage(s string) string {
needsQuoting := false
for _, r := range s {
// Allow CR/LF/TAB. This is to make multi-line messages work.
if r == '\r' || r == '\n' || r == '\t' {
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continue
}
// We quote everything below <space> (0x20) and above~ (0x7E),
// plus equal-sign
if r < ' ' || r > '~' || r == '=' {
needsQuoting = true
break
}
}
if !needsQuoting {
return s
}
return strconv.Quote(s)
}