New logging system (#319)

* First pass at adding new logging system

* NewLogger

* NewLogger

* WIP

* silly bug fix

* :D removed files

* removed old logging interface

* added tests

* added tests

* Started to add new lines to all f calls

* Added subsystem log types

* Logger improvements

* Further performance improvements

* changes to logger and sublogger creation

* Renamed Logging types

* removed old print statement

* changes based on feedback

* moved sublogger types to own file

* :)

* added console as output type

* added get level command

* added get/set log level via grpc command

* added check for output being empty for migration support

* first pass at log rotation

* added log rotation

* :D derp fixed

* added tests

* changes based on feedback

* changed log type

* comments

* renamed file -> fileSettings

* typo fix

* changes based on feedback

* gofmt ran on additional files

* gofmt ran on additional files

exchanges/gemini/gemini.go

@@ -433,7 +433,7 @@ func (g *Gemini) SendAuthenticatedHTTPRequest(method, path string, params map[st
 	}
 
 	if g.Verbose {
-		log.Debugf("Request JSON: %s", PayloadJSON)
+		log.Debugf(log.ExchangeSys, "Request JSON: %s", PayloadJSON)
 	}
 
 	PayloadBase64 := crypto.Base64Encode(PayloadJSON)

exchanges/gemini/gemini_websocket.go

@@ -48,7 +48,7 @@ func (g *Gemini) WsConnect() error {
 	go g.WsHandleData()
 	err := g.WsSecureSubscribe(&dialer, geminiWsOrderEvents)
 	if err != nil {
-		log.Errorf("%v - authentication failed: %v", g.Name, err)
+		log.Errorf(log.ExchangeSys, "%v - authentication failed: %v\n", g.Name, err)
 	}
 	return g.WsSubscribe(&dialer)
 }

exchanges/gemini/gemini_wrapper.go

@@ -140,7 +140,7 @@ func (g *Gemini) Run() {
 
 	err := g.UpdateTradablePairs(false)
 	if err != nil {
-		log.Errorf("%s failed to update tradable pairs. Err: %s", g.Name, err)
+		log.Errorf(log.ExchangeSys, "%s failed to update tradable pairs. Err: %s", g.Name, err)
 	}
 }