clone

server/system/system.go

@@ -0,0 +1,24 @@
+package system
+
+// Info contains atomic counters and values for various server statistics
+// commonly found in $SYS topics.
+type Info struct {
+	Version             string `json:"version"`              // the current version of the server.
+	Started             int64  `json:"started"`              // the time the server started in unix seconds.
+	Uptime              int64  `json:"uptime"`               // the number of seconds the server has been online.
+	BytesRecv           int64  `json:"bytes_recv"`           // the total number of bytes received in all packets.
+	BytesSent           int64  `json:"bytes_sent"`           // the total number of bytes sent to clients.
+	ClientsConnected    int64  `json:"clients_connected"`    // the number of currently connected clients.
+	ClientsDisconnected int64  `json:"clients_disconnected"` // the number of disconnected non-cleansession clients.
+	ClientsMax          int64  `json:"clients_max"`          // the maximum number of clients that have been concurrently connected.
+	ClientsTotal        int64  `json:"clients_total"`        // the sum of all clients, connected and disconnected.
+	ConnectionsTotal    int64  `json:"connections_total"`    // the sum number of clients which have ever connected.
+	MessagesRecv        int64  `json:"messages_recv"`        // the total number of packets received.
+	MessagesSent        int64  `json:"messages_sent"`        // the total number of packets sent.
+	PublishDropped      int64  `json:"publish_dropped"`      // the number of in-flight publish messages which were dropped.
+	PublishRecv         int64  `json:"publish_recv"`         // the total number of received publish packets.
+	PublishSent         int64  `json:"publish_sent"`         // the total number of sent publish packets.
+	Retained            int64  `json:"retained"`             // the number of messages currently retained.
+	Inflight            int64  `json:"inflight"`             // the number of messages currently in-flight.
+	Subscriptions       int64  `json:"subscriptions"`        // the total number of filter subscriptions.
+}

server/system/system_test.go

@@ -0,0 +1,21 @@
+package system
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestInfoAlignment(t *testing.T) {
+	typ := reflect.TypeOf(Info{})
+	for i := 0; i < typ.NumField(); i++ {
+		f := typ.Field(i)
+		switch f.Type.Kind() {
+		case reflect.Int64, reflect.Uint64:
+			require.Equalf(t, uintptr(0), f.Offset%8,
+				"%s requires 64-bit alignment for atomic: offset %d",
+				f.Name, f.Offset)
+		}
+	}
+}