[PATCH 1/4] golang/xenlight: add NameToDomid and DomidToName util functions

[Nick Rosbrook <rosbrookn@xxxxxxxxx>]

Many exported functions in xenlight require a domid as an argument. Make
it easier for package users to use these functions by adding wrappers
for the libxl utility functions libxl_name_to_domid and
libxl_domid_to_name.

Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
---
 tools/golang/xenlight/xenlight.go | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/golang/xenlight/xenlight.go 
b/tools/golang/xenlight/xenlight.go
index 3f1b0baa0c..8492bcec4e 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -20,6 +20,7 @@ package xenlight
 #cgo LDFLAGS: -lxenlight -lyajl -lxentoollog
 #include <stdlib.h>
 #include <libxl.h>
+#include <libxl_utils.h>
 */
 import "C"
 
@@ -124,6 +125,28 @@ func (ctx *Context) Close() error {
 
 type Domid uint32
 
+// NameToDomid returns the Domid for a domain, given its name, if it exists.
+func (Ctx *Context) NameToDomid(name string) (Domid, error) {
+       var domid C.uint32_t
+
+       cname := C.CString(name)
+       defer C.free(unsafe.Pointer(cname))
+
+       if ret := C.libxl_name_to_domid(Ctx.ctx, cname, &domid); ret != 0 {
+               return ^Domid(0), Error(ret)
+       }
+
+       return Domid(domid), nil
+}
+
+// DomidToName returns the name for a domain, given its domid.
+func (Ctx *Context) DomidToName(domid Domid) string {
+       cname := C.libxl_domid_to_name(Ctx.ctx, C.uint32_t(domid))
+       defer C.free(unsafe.Pointer(cname))
+
+       return C.GoString(cname)
+}
+
 // Devid is a device ID.
 type Devid int
 
-- 
2.17.1