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127 lines
3.2 KiB
127 lines
3.2 KiB
package log
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import (
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"bytes"
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"fmt"
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"io"
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"sync"
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"time"
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kitlog "github.com/go-kit/kit/log"
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kitlevel "github.com/go-kit/kit/log/level"
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"github.com/go-logfmt/logfmt"
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)
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type tmfmtEncoder struct {
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*logfmt.Encoder
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buf bytes.Buffer
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}
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func (l *tmfmtEncoder) Reset() {
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l.Encoder.Reset()
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l.buf.Reset()
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}
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var tmfmtEncoderPool = sync.Pool{
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New: func() interface{} {
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var enc tmfmtEncoder
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enc.Encoder = logfmt.NewEncoder(&enc.buf)
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return &enc
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},
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}
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type tmfmtLogger struct {
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w io.Writer
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}
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// NewTMFmtLogger returns a logger that encodes keyvals to the Writer in
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// Tendermint custom format. Note complex types (structs, maps, slices)
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// formatted as "%+v".
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//
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// Each log event produces no more than one call to w.Write.
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// The passed Writer must be safe for concurrent use by multiple goroutines if
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// the returned Logger will be used concurrently.
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func NewTMFmtLogger(w io.Writer) kitlog.Logger {
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return &tmfmtLogger{w}
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}
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func (l tmfmtLogger) Log(keyvals ...interface{}) error {
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enc := tmfmtEncoderPool.Get().(*tmfmtEncoder)
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enc.Reset()
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defer tmfmtEncoderPool.Put(enc)
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const unknown = "unknown"
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lvl := "none"
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msg := unknown
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module := unknown
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// indexes of keys to skip while encoding later
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excludeIndexes := make([]int, 0)
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for i := 0; i < len(keyvals)-1; i += 2 {
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// Extract level
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if keyvals[i] == kitlevel.Key() {
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excludeIndexes = append(excludeIndexes, i)
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switch keyvals[i+1].(type) {
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case string:
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lvl = keyvals[i+1].(string)
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case kitlevel.Value:
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lvl = keyvals[i+1].(kitlevel.Value).String()
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default:
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panic(fmt.Sprintf("level value of unknown type %T", keyvals[i+1]))
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}
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// and message
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} else if keyvals[i] == msgKey {
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excludeIndexes = append(excludeIndexes, i)
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msg = keyvals[i+1].(string)
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// and module (could be multiple keyvals; if such case last keyvalue wins)
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} else if keyvals[i] == moduleKey {
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excludeIndexes = append(excludeIndexes, i)
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module = keyvals[i+1].(string)
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}
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}
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// Form a custom Tendermint line
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//
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// Example:
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// D[2016-05-02|11:06:44.322] Stopping AddrBook (ignoring: already stopped)
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//
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// Description:
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// D - first character of the level, uppercase (ASCII only)
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// [2016-05-02|11:06:44.322] - our time format (see https://golang.org/src/time/format.go)
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// Stopping ... - message
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enc.buf.WriteString(fmt.Sprintf("%c[%s] %-44s ", lvl[0]-32, time.Now().Format("2016-01-02|15:04:05.000"), msg))
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if module != unknown {
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enc.buf.WriteString("module=" + module + " ")
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}
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KeyvalueLoop:
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for i := 0; i < len(keyvals)-1; i += 2 {
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for _, j := range excludeIndexes {
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if i == j {
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continue KeyvalueLoop
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}
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}
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err := enc.EncodeKeyval(keyvals[i], keyvals[i+1])
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if err == logfmt.ErrUnsupportedValueType {
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enc.EncodeKeyval(keyvals[i], fmt.Sprintf("%+v", keyvals[i+1]))
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} else if err != nil {
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return err
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}
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}
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// Add newline to the end of the buffer
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if err := enc.EndRecord(); err != nil {
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return err
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}
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// The Logger interface requires implementations to be safe for concurrent
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// use by multiple goroutines. For this implementation that means making
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// only one call to l.w.Write() for each call to Log.
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if _, err := l.w.Write(enc.buf.Bytes()); err != nil {
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return err
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}
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return nil
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}
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