[PATCH RFC 2/8] golang/xenlight: Add error constants and standard handling

[Ronald Rojas <ronladred@gmail.com>]

Create error type Errorxl for throwing proper xenlight
errors.

Update Ctx functions to throw Errorxl errors.

Signed-off-by: Ronald Rojas <ronladred@gmail.com>
---
 tools/golang/xenlight/xenlight.go | 77 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 73 insertions(+), 4 deletions(-)

diff --git a/tools/golang/xenlight/xenlight.go b/tools/golang/xenlight/xenlight.go
index 1f10e51..d58f8b8 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -32,6 +32,77 @@ import (
 )
 
 /*
+ * Errors
+ */
+type Errorxl int
+
+const (
+	ErrorNonspecific                  = Errorxl(-C.ERROR_NONSPECIFIC)
+	ErrorVersion                      = Errorxl(-C.ERROR_VERSION)
+	ErrorFail                         = Errorxl(-C.ERROR_FAIL)
+	ErrorNi                           = Errorxl(-C.ERROR_NI)
+	ErrorNomem                        = Errorxl(-C.ERROR_NOMEM)
+	ErrorInval                        = Errorxl(-C.ERROR_INVAL)
+	ErrorBadfail                      = Errorxl(-C.ERROR_BADFAIL)
+	ErrorGuestTimedout                = Errorxl(-C.ERROR_GUEST_TIMEDOUT)
+	ErrorTimedout                     = Errorxl(-C.ERROR_TIMEDOUT)
+	ErrorNoparavirt                   = Errorxl(-C.ERROR_NOPARAVIRT)
+	ErrorNotReady                     = Errorxl(-C.ERROR_NOT_READY)
+	ErrorOseventRegFail               = Errorxl(-C.ERROR_OSEVENT_REG_FAIL)
+	ErrorBufferfull                   = Errorxl(-C.ERROR_BUFFERFULL)
+	ErrorUnknownChild                 = Errorxl(-C.ERROR_UNKNOWN_CHILD)
+	ErrorLockFail                     = Errorxl(-C.ERROR_LOCK_FAIL)
+	ErrorJsonConfigEmpty              = Errorxl(-C.ERROR_JSON_CONFIG_EMPTY)
+	ErrorDeviceExists                 = Errorxl(-C.ERROR_DEVICE_EXISTS)
+	ErrorCheckpointDevopsDoesNotMatch = Errorxl(-C.ERROR_CHECKPOINT_DEVOPS_DOES_NOT_MATCH)
+	ErrorCheckpointDeviceNotSupported = Errorxl(-C.ERROR_CHECKPOINT_DEVICE_NOT_SUPPORTED)
+	ErrorVnumaConfigInvalid           = Errorxl(-C.ERROR_VNUMA_CONFIG_INVALID)
+	ErrorDomainNotfound               = Errorxl(-C.ERROR_DOMAIN_NOTFOUND)
+	ErrorAborted                      = Errorxl(-C.ERROR_ABORTED)
+	ErrorNotfound                     = Errorxl(-C.ERROR_NOTFOUND)
+	ErrorDomainDestroyed              = Errorxl(-C.ERROR_DOMAIN_DESTROYED)
+	ErrorFeatureRemoved               = Errorxl(-C.ERROR_FEATURE_REMOVED)
+)
+
+var errors = [...]string{
+	ErrorNonspecific:                  "Non-specific error",
+	ErrorVersion:                      "Wrong version",
+	ErrorFail:                         "Failed",
+	ErrorNi:                           "Null",
+	ErrorNomem:                        "No memory",
+	ErrorInval:                        "Invalid",
+	ErrorBadfail:                      "Bad Fail",
+	ErrorGuestTimedout:                "Guest timed out",
+	ErrorTimedout:                     "Timed out",
+	ErrorNoparavirt:                   "No Paravirtualization",
+	ErrorNotReady:                     "Not ready",
+	ErrorOseventRegFail:               "OS event failed",
+	ErrorBufferfull:                   "Buffer full",
+	ErrorUnknownChild:                 "Unknown child",
+	ErrorLockFail:                     "Lock failed",
+	ErrorJsonConfigEmpty:              "JSON config empyt",
+	ErrorDeviceExists:                 "Device exists",
+	ErrorCheckpointDevopsDoesNotMatch: "Checkpoint devops does not match",
+	ErrorCheckpointDeviceNotSupported: "Checkpoint device not supported",
+	ErrorVnumaConfigInvalid:           "VNUMA config invalid",
+	ErrorDomainNotfound:               "Domain not found",
+	ErrorAborted:                      "Aborted",
+	ErrorNotfound:                     "Not found",
+	ErrorDomainDestroyed:              "Domain destroyed",
+	ErrorFeatureRemoved:               "Feature removed",
+}
+
+func (e Errorxl) Error() string {
+	if 0 <= -int(e) && -int(e) < len(errors) {
+		s := errors[-e]
+		if s != "" {
+			return s
+		}
+	}
+	return "errorxl " + strconv.Itoa(int(e))
+}
+
+/*
  * Types: Builtins
  */
 type Context struct {
@@ -55,8 +126,7 @@ func (Ctx *Context) Open() (err error) {
 	ret := C.libxl_ctx_alloc(unsafe.Pointer(&Ctx.ctx), C.LIBXL_VERSION, 0, nil)
 
 	if ret != 0 {
-		//FIXME: proper error
-		err = createError("Allocating libxl context: ", ret)
+		err = Errorxl(ret)
 	}
 	return
 }
@@ -66,8 +136,7 @@ func (Ctx *Context) Close() (err error) {
 	Ctx.ctx = nil
 
 	if ret != 0 {
-		//FIXME: proper error
-		err = createError("Freeing libxl context: ", ret)
+		err = Errorxl(ret)
 	}
 	return
 }
-- 
2.7.4


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