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* Implement log/... packages with github.com/go-kit/log * Use github.com/go-kit/log/... in all the other packages
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,91 +1,15 @@ | ||
| package log | ||
|
|
||
| import ( | ||
| "encoding" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "reflect" | ||
| ) | ||
|
|
||
| type jsonLogger struct { | ||
| io.Writer | ||
| } | ||
| "github.com/go-kit/log" | ||
| ) | ||
|
|
||
| // NewJSONLogger returns a Logger that encodes keyvals to the Writer as a | ||
| // single JSON object. Each log event produces no more than one call to | ||
| // w.Write. The passed Writer must be safe for concurrent use by multiple | ||
| // goroutines if the returned Logger will be used concurrently. | ||
| func NewJSONLogger(w io.Writer) Logger { | ||
| return &jsonLogger{w} | ||
| } | ||
|
|
||
| func (l *jsonLogger) Log(keyvals ...interface{}) error { | ||
| n := (len(keyvals) + 1) / 2 // +1 to handle case when len is odd | ||
| m := make(map[string]interface{}, n) | ||
| for i := 0; i < len(keyvals); i += 2 { | ||
| k := keyvals[i] | ||
| var v interface{} = ErrMissingValue | ||
| if i+1 < len(keyvals) { | ||
| v = keyvals[i+1] | ||
| } | ||
| merge(m, k, v) | ||
| } | ||
| enc := json.NewEncoder(l.Writer) | ||
| enc.SetEscapeHTML(false) | ||
| return enc.Encode(m) | ||
| } | ||
|
|
||
| func merge(dst map[string]interface{}, k, v interface{}) { | ||
| var key string | ||
| switch x := k.(type) { | ||
| case string: | ||
| key = x | ||
| case fmt.Stringer: | ||
| key = safeString(x) | ||
| default: | ||
| key = fmt.Sprint(x) | ||
| } | ||
|
|
||
| // We want json.Marshaler and encoding.TextMarshaller to take priority over | ||
| // err.Error() and v.String(). But json.Marshall (called later) does that by | ||
| // default so we force a no-op if it's one of those 2 case. | ||
| switch x := v.(type) { | ||
| case json.Marshaler: | ||
| case encoding.TextMarshaler: | ||
| case error: | ||
| v = safeError(x) | ||
| case fmt.Stringer: | ||
| v = safeString(x) | ||
| } | ||
|
|
||
| dst[key] = v | ||
| } | ||
|
|
||
| func safeString(str fmt.Stringer) (s string) { | ||
| defer func() { | ||
| if panicVal := recover(); panicVal != nil { | ||
| if v := reflect.ValueOf(str); v.Kind() == reflect.Ptr && v.IsNil() { | ||
| s = "NULL" | ||
| } else { | ||
| panic(panicVal) | ||
| } | ||
| } | ||
| }() | ||
| s = str.String() | ||
| return | ||
| } | ||
|
|
||
| func safeError(err error) (s interface{}) { | ||
| defer func() { | ||
| if panicVal := recover(); panicVal != nil { | ||
| if v := reflect.ValueOf(err); v.Kind() == reflect.Ptr && v.IsNil() { | ||
| s = nil | ||
| } else { | ||
| panic(panicVal) | ||
| } | ||
| } | ||
| }() | ||
| s = err.Error() | ||
| return | ||
| return log.NewJSONLogger(w) | ||
| } |
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