add helpers

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

log.go

@@ -3,9 +3,11 @@
 package log
 
 import (
+	"encoding/json"
 	"time"
 
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
 // StandardLogger provides API compatibility with standard printf loggers
@@ -73,3 +75,28 @@ func (logger *ZapEventLogger) Warningf(format string, args ...interface{}) {
 func FormatRFC3339(t time.Time) string {
 	return t.UTC().Format(time.RFC3339Nano)
 }
+
+// SetLogLevels sets levels for the given systems.
+func SetLogLevels(systems map[string]LogLevel) error {
+	for sys, level := range systems {
+		l := zapcore.Level(level)
+		if sys == "*" {
+			for _, s := range GetSubsystems() {
+				if err := SetLogLevel(s, l.CapitalString()); err != nil {
+					return err
+				}
+			}
+		}
+		if err := SetLogLevel(sys, l.CapitalString()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// MustJSONIndent is an errorless method to json indent structs so they can be printed
+// in log.XXXf in a single line.
+func MustJSONIndent(b interface{}) string {
+	jsn, _ := json.MarshalIndent(b, "", " ")
+	return string(jsn)
+}