add GetVersion to acn and torProvider

acn.go

@@ -55,5 +55,8 @@ type ACN interface {
 	// Get PID
 	GetPID() (int, error)
 
+	// GetVersion returns a string of what the ACN returns when asked for a version
+	GetVersion() string
+
 	Close()
 }

localProvider.go

@@ -47,6 +47,10 @@ func (lp *localProvider) GetPID() (int, error) {
 	return 0, nil
 }
 
+func (lp *localProvider) GetVersion() string {
+	return "0.1"
+}
+
 // WaitTillBootstrapped Blocks until underlying network is bootstrapped
 func (lp *localProvider) WaitTillBootstrapped() {
 }

tor/torProvider.go

@@ -137,6 +137,22 @@ func (tp *torProvider) GetBootstrapStatus() (int, string) {
 	return progress, status
 }
 
+func (tp *torProvider) GetVersion() string {
+	tp.lock.Lock()
+	defer tp.lock.Unlock()
+
+	if tp.t == nil {
+		return "No Tor"
+	}
+
+	pinfo, err := tp.t.Control.ProtocolInfo()
+
+	if err == nil {
+		return pinfo.TorVersion
+	}
+	return "No Tor"
+}
+
 // WaitTillBootstrapped Blocks until underlying network is bootstrapped
 func (tp *torProvider) WaitTillBootstrapped() {
 	for true {
@@ -290,9 +306,12 @@ func (tp *torProvider) checkVersion() error {
 		if err == nil {
 			log.Debugln("connected to control port")
 			pinfo, err := controlport.ProtocolInfo()
-			if err == nil && minTorVersionReqs(pinfo.TorVersion) {
-				log.Debugln("OK version " + pinfo.TorVersion)
-				return nil
+			if err == nil {
+				if minTorVersionReqs(pinfo.TorVersion) {
+					log.Debugln("OK version " + pinfo.TorVersion)
+					return nil
+				}
+				return fmt.Errorf("Tor version not supported: %v", pinfo.TorVersion)
 			}
 		}
 	}