chore: Restructure files.

backend/commonbackend/constants.go

@@ -0,0 +1,147 @@
+package commonbackend
+
+type Start struct {
+	Type      string // Will be 'start' always
+	Arguments []byte
+}
+
+type Stop struct {
+	Type string // Will be 'stop' always
+}
+
+type AddProxy struct {
+	Type       string // Will be 'addProxy' always
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type RemoveProxy struct {
+	Type       string // Will be 'removeProxy' always
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type ProxyStatusRequest struct {
+	Type       string // Will be 'proxyStatusRequest' always
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type ProxyStatusResponse struct {
+	Type       string // Will be 'proxyStatusResponse' always
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+	IsActive   bool
+}
+
+type ProxyInstance struct {
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type ProxyInstanceResponse struct {
+	Type    string           // Will be 'proxyConnectionResponse' always
+	Proxies []*ProxyInstance // List of connections
+}
+
+type ProxyInstanceRequest struct {
+	Type string // Will be 'proxyConnectionRequest' always
+}
+
+type BackendStatusResponse struct {
+	Type       string // Will be 'backendStatusResponse' always
+	IsRunning  bool   // True if running, false if not running
+	StatusCode int    // Either the 'Success' or 'Failure' constant
+	Message    string // String message from the client (ex. failed to dial TCP)
+}
+
+type BackendStatusRequest struct {
+	Type string // Will be 'backendStatusRequest' always
+}
+
+type ProxyConnectionsRequest struct {
+	Type string // Will be 'proxyConnectionsRequest' always
+}
+
+// Client's connection to a specific proxy
+type ProxyClientConnection struct {
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	ClientIP   string
+	ClientPort uint16
+}
+
+type ProxyConnectionsResponse struct {
+	Type        string                   // Will be 'proxyConnectionsResponse' always
+	Connections []*ProxyClientConnection // List of connections
+}
+
+type CheckClientParameters struct {
+	Type       string // Will be 'checkClientParameters' always
+	SourceIP   string
+	SourcePort uint16
+	DestPort   uint16
+	Protocol   string // Will be either 'tcp' or 'udp'
+}
+
+type CheckServerParameters struct {
+	Type      string // Will be 'checkServerParameters' always
+	Arguments []byte
+}
+
+// Sent as a response to either CheckClientParameters or CheckBackendParameters
+type CheckParametersResponse struct {
+	Type         string // Will be 'checkParametersResponse' always
+	InResponseTo string // Will be either 'checkClientParameters' or 'checkServerParameters'
+	IsValid      bool   // If true, valid, and if false, invalid
+	Message      string // String message from the client (ex. failed to unmarshal JSON: x is not defined)
+}
+
+const (
+	StartID = iota
+	StopID
+	AddProxyID
+	RemoveProxyID
+	ProxyConnectionsResponseID
+	CheckClientParametersID
+	CheckServerParametersID
+	CheckParametersResponseID
+	ProxyConnectionsRequestID
+	BackendStatusResponseID
+	BackendStatusRequestID
+	ProxyStatusRequestID
+	ProxyStatusResponseID
+	ProxyInstanceResponseID
+	ProxyInstanceRequestID
+)
+
+const (
+	TCP = iota
+	UDP
+)
+
+const (
+	StatusSuccess = iota
+	StatusFailure
+)
+
+const (
+	// IP versions
+	IPv4 = 4
+	IPv6 = 6
+
+	// TODO: net has these constants defined already. We should switch to these
+	IPv4Size = 4
+	IPv6Size = 16
+)