adding initial toml config

fixing URI host struct to work better with configuration

etc/clustvirt.toml

@@ -1,5 +1,18 @@
 # Define the servers that part of the cluster
 
-[connections.localhost]
-uri = "qemu:///system"
+## daemon sets daemon configuration
+[daemon]
+loglevel = "debug"
+runpath = "/run/clustvirt.pid"
+
+## connections are the VM hosts to connect to as part of the cluster
+[connections]
+# interval is the time in seconds to check host connections
+interval = 60
+
+[connections.goblin.uri]
+driver = "qemu"
+transport = "local"
+host = "localhost"
+path = "system"
 user = "stobbsm"

lib/host/uri.go

@@ -14,55 +14,94 @@ type URI struct {
 	Driver    string
 	Transport string
 	Path      string
+	Host      string
 	Options   []string
 }
 
 // CustomURI create and return a custom URI method, following RFC2396,
 // keeping in mind that the hostname will be inserted between the transport and path
-func CustomURI(driver, transport, path string, options ...string) *URI {
+func CustomURI(driver, transport, path, host string, options ...string) *URI {
 	return &URI{
 		Driver:    driver,
 		Transport: transport,
 		Path:      path,
+		Host:      host,
 		Options:   options,
 	}
 }
 
-// URIs available to build connections to a libvirt host
-var (
-	// URI for connecting to a remote QEMU system over SSH
-	URI_QEMU_SSH_SYSTEM = &URI{Driver: "qemu", Transport: "ssh", Path: "system"}
-	// URI for connecting to a remote	QEMU system over TLS
-	// Builds the URI qemu://<host:port>/system
-	URI_QEMU_TLS_SYSTEM = &URI{Driver: "qemu", Transport: "", Path: "system"}
-	// URI for connecting to a remote QEMU session over SSH
-	URI_QEMU_SSH_SESSION = &URI{Driver: "qemu", Transport: "ssh", Path: "session"}
-	// URI for connecting to a local QEMU system over a UNIX socket
-	URI_QEMU_UNIX_SYSTEM = &URI{Driver: "qemu", Transport: "unix", Path: "system"}
-	// URI for connecting to a remote QEMU system over unsecured TCP
-	URI_QEMU_TCP_SYSTEM = &URI{Driver: "qemu", Transport: "tcp", Path: "system"}
+// WithHost sets the hostname as part of a URI. It copies the original URI and returns a new one
+func (u *URI) WithHost(host string) *URI {
+	return &URI{
+		Driver:    u.Driver,
+		Transport: u.Transport,
+		Path:      u.Path,
+		Host:      host,
+		Options:   u.Options,
+	}
+}
 
-	// URI for connecting to a remote XEN system with SSH
-	URI_XEN_SSH_SYSTEM = &URI{Driver: "xen", Transport: "ssh", Path: "system"}
-	// URI for connecting to a remote XEN system over TLS
-	URI_XEN_TLS_SYSTEM = &URI{Driver: "xen", Transport: "", Path: "system"}
-)
+// IsRemote returns true if the URI references a remote trasnport (ssh, tcp or tls)
+func (u *URI) IsRemote() bool {
+	switch u.Transport {
+	case "ssh":
+		fallthrough
+	case "tls":
+		fallthrough
+	case "tcp":
+		return true
+	default:
+		return false
+	}
+}
+
+// validTransport makes sure the value of transport if valid or empty. If the transport
+// isn't remote, it returns an empty string
+func (u *URI) validTransport() string {
+	if u.IsRemote() {
+		return u.Transport
+	}
+	return ""
+}
+
+func (u *URI) validDriver() bool {
+	switch u.Driver {
+	case "qemu":
+		fallthrough
+	case "xen":
+		return true
+	default:
+		return false
+	}
+}
 
 // ConnectionString takes a host name to interpolate into a URI and returns the string
-func (u *URI) ConnectionString(h string) string {
+func (u *URI) ConnectionString() string {
+	// Normalize the variables
+	var driver, transport, path, host string
+	if u.IsRemote() {
+		transport = u.Transport
+	}
+	if u.Host != "localhost" {
+		host = u.Host
+	}
+	// TODO: validate driver, path
+	driver = u.Driver
+	path = u.Path
+
 	var sb strings.Builder
 	optlen := len(u.Options)
-	sb.WriteString(u.Driver)
-	if u.Transport != "" {
+	sb.WriteString(driver)
+	if transport != "" {
 		sb.WriteRune('+')
 		sb.WriteString(u.Transport)
 	}
 	sb.WriteString("://")
-	if h != "" {
-		sb.WriteString(h)
+	if host != "" {
+		sb.WriteString(host)
 	}
 	sb.WriteRune('/')
-	sb.WriteString(u.Path)
+	sb.WriteString(path)
 
 	if optlen > 0 {
 		sb.WriteRune('?')