go vendor
This commit is contained in:
lealife
279
vendor/github.com/revel/log15/format.go
generated
vendored
Normal file
279
vendor/github.com/revel/log15/format.go
generated
vendored
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@ -0,0 +1,279 @@
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package log15
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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const (
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timeFormat = "2006-01-02T15:04:05-0700"
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termTimeFormat = "01-02|15:04:05"
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floatFormat = 'f'
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termMsgJust = 40
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)
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type Format interface {
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Format(r *Record) []byte
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}
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// FormatFunc returns a new Format object which uses
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// the given function to perform record formatting.
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func FormatFunc(f func(*Record) []byte) Format {
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return formatFunc(f)
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}
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type formatFunc func(*Record) []byte
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func (f formatFunc) Format(r *Record) []byte {
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return f(r)
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}
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// TerminalFormat formats log records optimized for human readability on
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// a terminal with color-coded level output and terser human friendly timestamp.
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// This format should only be used for interactive programs or while developing.
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//
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// [TIME] [LEVEL] MESAGE key=value key=value ...
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//
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// Example:
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//
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// [May 16 20:58:45] [DBUG] remove route ns=haproxy addr=127.0.0.1:50002
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//
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func TerminalFormat() Format {
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return FormatFunc(func(r *Record) []byte {
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var color = 0
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switch r.Lvl {
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case LvlCrit:
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color = 35
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case LvlError:
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color = 31
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case LvlWarn:
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color = 33
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case LvlInfo:
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color = 32
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case LvlDebug:
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color = 36
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}
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b := &bytes.Buffer{}
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lvl := strings.ToUpper(r.Lvl.String())
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if color > 0 {
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fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s] %s ", color, lvl, r.Time.Format(termTimeFormat), r.Msg)
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} else {
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fmt.Fprintf(b, "[%s] [%s] %s ", lvl, r.Time.Format(termTimeFormat), r.Msg)
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}
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// try to justify the log output for short messages
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if len(r.Ctx) > 0 && len(r.Msg) < termMsgJust {
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b.Write(bytes.Repeat([]byte{' '}, termMsgJust-len(r.Msg)))
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}
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// print the keys logfmt style
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logfmt(b, r.Ctx, color)
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return b.Bytes()
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})
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}
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// LogfmtFormat prints records in logfmt format, an easy machine-parseable but human-readable
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// format for key/value pairs.
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//
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// For more details see: http://godoc.org/github.com/kr/logfmt
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//
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func LogfmtFormat() Format {
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return FormatFunc(func(r *Record) []byte {
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common := []interface{}{r.KeyNames.Time, r.Time, r.KeyNames.Lvl, r.Lvl, r.KeyNames.Msg, r.Msg}
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buf := &bytes.Buffer{}
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logfmt(buf, append(common, r.Ctx...), 0)
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return buf.Bytes()
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})
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}
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func logfmt(buf *bytes.Buffer, ctx []interface{}, color int) {
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for i := 0; i < len(ctx); i += 2 {
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if i != 0 {
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buf.WriteByte(' ')
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}
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k, ok := ctx[i].(string)
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v := formatLogfmtValue(ctx[i+1])
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if !ok {
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k, v = errorKey, formatLogfmtValue(k)
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}
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// XXX: we should probably check that all of your key bytes aren't invalid
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if color > 0 {
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fmt.Fprintf(buf, "\x1b[%dm%s\x1b[0m=%s", color, k, v)
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} else {
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buf.WriteString(k)
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buf.WriteByte('=')
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buf.WriteString(v)
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}
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}
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buf.WriteByte('\n')
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}
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// JsonFormat formats log records as JSON objects separated by newlines.
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// It is the equivalent of JsonFormatEx(false, true).
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func JsonFormat() Format {
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return JsonFormatEx(false, true)
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}
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// JsonFormatEx formats log records as JSON objects. If pretty is true,
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// records will be pretty-printed. If lineSeparated is true, records
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// will be logged with a new line between each record.
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func JsonFormatEx(pretty, lineSeparated bool) Format {
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jsonMarshal := json.Marshal
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if pretty {
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jsonMarshal = func(v interface{}) ([]byte, error) {
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return json.MarshalIndent(v, "", " ")
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}
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}
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return FormatFunc(func(r *Record) []byte {
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props := make(map[string]interface{})
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props[r.KeyNames.Time] = r.Time
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props[r.KeyNames.Lvl] = r.Lvl.String()
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props[r.KeyNames.Msg] = r.Msg
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for i := 0; i < len(r.Ctx); i += 2 {
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k, ok := r.Ctx[i].(string)
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if !ok {
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props[errorKey] = fmt.Sprintf("%+v is not a string key", r.Ctx[i])
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}
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props[k] = formatJsonValue(r.Ctx[i+1])
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}
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b, err := jsonMarshal(props)
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if err != nil {
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b, _ = jsonMarshal(map[string]string{
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errorKey: err.Error(),
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})
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return b
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}
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if lineSeparated {
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b = append(b, '\n')
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}
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return b
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})
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}
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func formatShared(value interface{}) (result interface{}) {
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defer func() {
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if err := recover(); err != nil {
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if v := reflect.ValueOf(value); v.Kind() == reflect.Ptr && v.IsNil() {
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result = "nil"
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} else {
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panic(err)
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}
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}
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}()
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switch v := value.(type) {
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case time.Time:
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return v.Format(timeFormat)
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case error:
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return v.Error()
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case fmt.Stringer:
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return v.String()
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default:
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return v
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}
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}
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func formatJsonValue(value interface{}) interface{} {
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value = formatShared(value)
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switch value.(type) {
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case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string:
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return value
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default:
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return fmt.Sprintf("%+v", value)
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}
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}
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// formatValue formats a value for serialization
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func formatLogfmtValue(value interface{}) string {
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if value == nil {
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return "nil"
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}
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if t, ok := value.(time.Time); ok {
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// Performance optimization: No need for escaping since the provided
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// timeFormat doesn't have any escape characters, and escaping is
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// expensive.
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return t.Format(timeFormat)
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}
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value = formatShared(value)
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switch v := value.(type) {
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case bool:
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return strconv.FormatBool(v)
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case float32:
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return strconv.FormatFloat(float64(v), floatFormat, 3, 64)
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case float64:
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return strconv.FormatFloat(v, floatFormat, 3, 64)
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case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
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return fmt.Sprintf("%d", value)
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case string:
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return escapeString(v)
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default:
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return escapeString(fmt.Sprintf("%+v", value))
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}
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}
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var stringBufPool = sync.Pool{
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New: func() interface{} { return new(bytes.Buffer) },
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}
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func escapeString(s string) string {
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needsQuotes := false
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needsEscape := false
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for _, r := range s {
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if r <= ' ' || r == '=' || r == '"' {
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needsQuotes = true
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}
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if r == '\\' || r == '"' || r == '\n' || r == '\r' || r == '\t' {
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needsEscape = true
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}
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}
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if needsEscape == false && needsQuotes == false {
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return s
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}
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e := stringBufPool.Get().(*bytes.Buffer)
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e.WriteByte('"')
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for _, r := range s {
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switch r {
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case '\\', '"':
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e.WriteByte('\\')
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e.WriteByte(byte(r))
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case '\n':
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e.WriteString("\\n")
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case '\r':
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e.WriteString("\\r")
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case '\t':
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e.WriteString("\\t")
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default:
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e.WriteRune(r)
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}
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}
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e.WriteByte('"')
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var ret string
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if needsQuotes {
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ret = e.String()
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} else {
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ret = string(e.Bytes()[1 : e.Len()-1])
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}
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e.Reset()
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stringBufPool.Put(e)
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return ret
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}
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