Merge pull request #214 from 9seconds/log-json

Add new BindJSON method to a logger

internal/cli/run_proxy.go

 func runProxy(conf *config.Config, version string) error {
 	logger := makeLogger(conf)
 
-	logger.BindStr("configuration", conf.String()).Debug("configuration")
+	logger.BindJSON("configuration", conf.String()).Debug("configuration")
 
 	ntw, err := makeNetwork(conf, version)
 	if err != nil {

logger/noop.go

 func (n noopLogger) Named(_ string) mtglib.Logger          { return n }
 func (n noopLogger) BindInt(_ string, _ int) mtglib.Logger { return n }
 func (n noopLogger) BindStr(_, _ string) mtglib.Logger     { return n }
+func (n noopLogger) BindJSON(_, _ string) mtglib.Logger    { return n }
 func (n noopLogger) Printf(_ string, _ ...interface{})     {}
 func (n noopLogger) Info(_ string)                         {}
 func (n noopLogger) Warning(_ string)                      {}

logger/zerolog.go

 	zeroLogContextVarTypeUnknown zeroLogContextVarType = iota
 	zeroLogContextVarTypeStr
 	zeroLogContextVarTypeInt
+	zeroLogContextVarTypeJSON
 )
 
 type zeroLogContext struct {
 	}
 }
 
+func (z *zeroLogContext) BindJSON(name, value string) mtglib.Logger {
+	return &zeroLogContext{
+		name:       z.name,
+		log:        z.log,
+		ctxVarType: zeroLogContextVarTypeJSON,
+		ctxVarName: name,
+		ctxVarStr:  value,
+		parent:     z,
+	}
+}
+
 func (z *zeroLogContext) Printf(format string, args ...interface{}) {
 	z.Debug(fmt.Sprintf(format, args...))
 }
 		evt.Str(z.ctxVarName, z.ctxVarStr)
 	case zeroLogContextVarTypeInt:
 		evt.Int(z.ctxVarName, z.ctxVarInt)
+	case zeroLogContextVarTypeJSON:
+		evt.RawJSON(z.ctxVarName, []byte(z.ctxVarStr))
 	case zeroLogContextVarTypeUnknown:
 	}
 }

mtglib/init.go

 	// BindStr binds new string parameter to a new logger instance.
 	BindStr(name, value string) Logger
 
+	// BindJSON binds a new JSON-encoded string to a new logger instance.
+	BindJSON(name, value string) Logger
+
 	// Printf is to support log.Logger behavior.
 	Printf(format string, args ...interface{})
 

mtglib/init_internal_test.go

 func (n NoopLogger) Named(_ string) Logger             { return n }
 func (n NoopLogger) BindInt(_ string, _ int) Logger    { return n }
 func (n NoopLogger) BindStr(_, _ string) Logger        { return n }
+func (n NoopLogger) BindJSON(_, _ string) Logger       { return n }
 func (n NoopLogger) Printf(_ string, _ ...interface{}) {}
 func (n NoopLogger) Info(_ string)                     {}
 func (n NoopLogger) Warning(_ string)                  {}