Add madmin package context support (#9172)

This is to improve responsiveness for all
admin API operations and allowing callers
to cancel any on-going admin operations,
if they happen to be waiting too long.

cmd/admin-handlers.go

@@ -1436,7 +1436,7 @@ func (a adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Reque
 			OffDisks += v
 		}
 
-		backend = madmin.XlBackend{
+		backend = madmin.XLBackend{
 			Type:             madmin.ErasureType,
 			OnlineDisks:      OnDisks,
 			OfflineDisks:     OffDisks,
@@ -1446,7 +1446,7 @@ func (a adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Reque
 			RRSCParity:       storageInfo.Backend.RRSCParity,
 		}
 	} else {
-		backend = madmin.FsBackend{
+		backend = madmin.FSBackend{
 			Type: madmin.FsType,
 		}
 	}

cmd/consolelogger.go

@@ -118,12 +118,12 @@ func (sys *HTTPConsoleLoggerSys) Subscribe(subCh chan interface{}, doneCh chan s
 // Send log message 'e' to console and publish to console
 // log pubsub system
 func (sys *HTTPConsoleLoggerSys) Send(e interface{}, logKind string) error {
-	var lg madmin.LogInfo
+	var lg log.Info
 	switch e := e.(type) {
 	case log.Entry:
-		lg = madmin.LogInfo{Entry: e, NodeName: sys.nodeName}
+		lg = log.Info{Entry: e, NodeName: sys.nodeName}
 	case string:
-		lg = madmin.LogInfo{ConsoleMsg: e, NodeName: sys.nodeName}
+		lg = log.Info{ConsoleMsg: e, NodeName: sys.nodeName}
 	}
 
 	sys.pubsub.Publish(lg)

cmd/logger/message/log/entry.go

@@ -50,3 +50,11 @@ type Entry struct {
 	Message      string `json:"message,omitempty"`
 	Trace        *Trace `json:"error,omitempty"`
 }
+
+// Info holds console log messages
+type Info struct {
+	Entry
+	ConsoleMsg string
+	NodeName   string `json:"node"`
+	Err        error  `json:"-"`
+}