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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 22/24] golang/xenlight: revise use of Context type
From: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
Remove the exported global context variable, 'Ctx.' Generally, it is
better to not export global variables for use through a Go package.
However, there are some exceptions that can be found in the standard
library.
Add a NewContext function instead, and remove the Open, IsOpen, and
CheckOpen functions as a result.
Also, comment-out an ineffectual assignment to 'err' inside the function
Context.CpupoolInfo so that compilation does not fail.
Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
---
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
tools/golang/xenlight/xenlight.go | 219 +++++-------------------------
1 file changed, 34 insertions(+), 185 deletions(-)
diff --git a/tools/golang/xenlight/xenlight.go
b/tools/golang/xenlight/xenlight.go
index a8f933c75f..e540b5413d 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -74,6 +74,39 @@ func (e Error) Error() string {
return fmt.Sprintf("libxl error: %d", -e)
}
+// Context represents a libxl_ctx.
+type Context struct {
+ ctx *C.libxl_ctx
+ logger *C.xentoollog_logger_stdiostream
+}
+
+// NewContext returns a new Context.
+func NewContext() (*Context, error) {
+ var ctx Context
+
+ ctx.logger = C.xtl_createlogger_stdiostream(C.stderr, C.XTL_ERROR, 0)
+
+ ret := C.libxl_ctx_alloc(&ctx.ctx, C.LIBXL_VERSION, 0,
(*C.xentoollog_logger)(unsafe.Pointer(ctx.logger)))
+ if ret != 0 {
+ return nil, Error(ret)
+ }
+
+ return &ctx, nil
+}
+
+// Close closes the Context.
+func (ctx *Context) Close() error {
+ ret := C.libxl_ctx_free(ctx.ctx)
+ ctx.ctx = nil
+ C.xtl_logger_destroy((*C.xentoollog_logger)(unsafe.Pointer(ctx.logger)))
+
+ if ret != 0 {
+ return Error(ret)
+ }
+
+ return nil
+}
+
/*
* Types: Builtins
*/
@@ -299,11 +332,6 @@ func (cpl *CpuidPolicyList) toC()
(C.libxl_cpuid_policy_list, error) {
return *ccpl, nil
}
-type Context struct {
- ctx *C.libxl_ctx
- logger *C.xentoollog_logger_stdiostream
-}
-
// Hwcap represents a libxl_hwcap.
type Hwcap [8]uint32
@@ -480,11 +508,6 @@ func SchedulerFromString(name string) (s Scheduler, err
error) {
// libxl_cpupoolinfo * libxl_list_cpupool(libxl_ctx*, int *nb_pool_out);
// void libxl_cpupoolinfo_list_free(libxl_cpupoolinfo *list, int nb_pool);
func (Ctx *Context) ListCpupool() (list []Cpupoolinfo) {
- err := Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var nbPool C.int
c_cpupool_list := C.libxl_list_cpupool(Ctx.ctx, &nbPool)
@@ -508,16 +531,11 @@ func (Ctx *Context) ListCpupool() (list []Cpupoolinfo) {
// int libxl_cpupool_info(libxl_ctx *ctx, libxl_cpupoolinfo *info, uint32_t
poolid);
func (Ctx *Context) CpupoolInfo(Poolid uint32) (pool Cpupoolinfo) {
- err := Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var c_cpupool C.libxl_cpupoolinfo
ret := C.libxl_cpupool_info(Ctx.ctx, &c_cpupool, C.uint32_t(Poolid))
if ret != 0 {
- err = Error(-ret)
+ //err = Error(-ret)
return
}
defer C.libxl_cpupoolinfo_dispose(&c_cpupool)
@@ -534,11 +552,6 @@ func (Ctx *Context) CpupoolInfo(Poolid uint32) (pool
Cpupoolinfo) {
// FIXME: uuid
// FIXME: Setting poolid
func (Ctx *Context) CpupoolCreate(Name string, Scheduler Scheduler, Cpumap
Bitmap) (err error, Poolid uint32) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
poolid := C.uint32_t(C.LIBXL_CPUPOOL_POOLID_ANY)
name := C.CString(Name)
defer C.free(unsafe.Pointer(name))
@@ -567,11 +580,6 @@ func (Ctx *Context) CpupoolCreate(Name string, Scheduler
Scheduler, Cpumap Bitma
// int libxl_cpupool_destroy(libxl_ctx *ctx, uint32_t poolid);
func (Ctx *Context) CpupoolDestroy(Poolid uint32) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_cpupool_destroy(Ctx.ctx, C.uint32_t(Poolid))
if ret != 0 {
err = Error(-ret)
@@ -583,11 +591,6 @@ func (Ctx *Context) CpupoolDestroy(Poolid uint32) (err
error) {
// int libxl_cpupool_cpuadd(libxl_ctx *ctx, uint32_t poolid, int cpu);
func (Ctx *Context) CpupoolCpuadd(Poolid uint32, Cpu int) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_cpupool_cpuadd(Ctx.ctx, C.uint32_t(Poolid), C.int(Cpu))
if ret != 0 {
err = Error(-ret)
@@ -600,11 +603,6 @@ func (Ctx *Context) CpupoolCpuadd(Poolid uint32, Cpu int)
(err error) {
// int libxl_cpupool_cpuadd_cpumap(libxl_ctx *ctx, uint32_t poolid,
// const libxl_bitmap *cpumap);
func (Ctx *Context) CpupoolCpuaddCpumap(Poolid uint32, Cpumap Bitmap) (err
error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
cbm, err := Cpumap.toC()
if err != nil {
return
@@ -622,11 +620,6 @@ func (Ctx *Context) CpupoolCpuaddCpumap(Poolid uint32,
Cpumap Bitmap) (err error
// int libxl_cpupool_cpuremove(libxl_ctx *ctx, uint32_t poolid, int cpu);
func (Ctx *Context) CpupoolCpuremove(Poolid uint32, Cpu int) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_cpupool_cpuremove(Ctx.ctx, C.uint32_t(Poolid),
C.int(Cpu))
if ret != 0 {
err = Error(-ret)
@@ -639,11 +632,6 @@ func (Ctx *Context) CpupoolCpuremove(Poolid uint32, Cpu
int) (err error) {
// int libxl_cpupool_cpuremove_cpumap(libxl_ctx *ctx, uint32_t poolid,
// const libxl_bitmap *cpumap);
func (Ctx *Context) CpupoolCpuremoveCpumap(Poolid uint32, Cpumap Bitmap) (err
error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
cbm, err := Cpumap.toC()
if err != nil {
return
@@ -661,11 +649,6 @@ func (Ctx *Context) CpupoolCpuremoveCpumap(Poolid uint32,
Cpumap Bitmap) (err er
// int libxl_cpupool_rename(libxl_ctx *ctx, const char *name, uint32_t poolid);
func (Ctx *Context) CpupoolRename(Name string, Poolid uint32) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
name := C.CString(Name)
defer C.free(unsafe.Pointer(name))
@@ -680,11 +663,6 @@ func (Ctx *Context) CpupoolRename(Name string, Poolid
uint32) (err error) {
// int libxl_cpupool_cpuadd_node(libxl_ctx *ctx, uint32_t poolid, int node,
int *cpus);
func (Ctx *Context) CpupoolCpuaddNode(Poolid uint32, Node int) (Cpus int, err
error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ccpus := C.int(0)
ret := C.libxl_cpupool_cpuadd_node(Ctx.ctx, C.uint32_t(Poolid),
C.int(Node), &ccpus)
@@ -700,11 +678,6 @@ func (Ctx *Context) CpupoolCpuaddNode(Poolid uint32, Node
int) (Cpus int, err er
// int libxl_cpupool_cpuremove_node(libxl_ctx *ctx, uint32_t poolid, int node,
int *cpus);
func (Ctx *Context) CpupoolCpuremoveNode(Poolid uint32, Node int) (Cpus int,
err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ccpus := C.int(0)
ret := C.libxl_cpupool_cpuremove_node(Ctx.ctx, C.uint32_t(Poolid),
C.int(Node), &ccpus)
@@ -720,11 +693,6 @@ func (Ctx *Context) CpupoolCpuremoveNode(Poolid uint32,
Node int) (Cpus int, err
// int libxl_cpupool_movedomain(libxl_ctx *ctx, uint32_t poolid, uint32_t
domid);
func (Ctx *Context) CpupoolMovedomain(Poolid uint32, Id Domid) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_cpupool_movedomain(Ctx.ctx, C.uint32_t(Poolid),
C.uint32_t(Id))
if ret != 0 {
err = Error(-ret)
@@ -884,60 +852,8 @@ func (bm Bitmap) String() (s string) {
return
}
-/*
- * Context
- */
-var Ctx Context
-
-func (Ctx *Context) IsOpen() bool {
- return Ctx.ctx != nil
-}
-
-func (Ctx *Context) Open() (err error) {
- if Ctx.ctx != nil {
- return
- }
-
- Ctx.logger = C.xtl_createlogger_stdiostream(C.stderr, C.XTL_ERROR, 0)
- if Ctx.logger == nil {
- err = fmt.Errorf("Cannot open stdiostream")
- return
- }
-
- ret := C.libxl_ctx_alloc(&Ctx.ctx, C.LIBXL_VERSION,
- 0, (*C.xentoollog_logger)(unsafe.Pointer(Ctx.logger)))
-
- if ret != 0 {
- err = Error(-ret)
- }
- return
-}
-
-func (Ctx *Context) Close() (err error) {
- ret := C.libxl_ctx_free(Ctx.ctx)
- Ctx.ctx = nil
-
- if ret != 0 {
- err = Error(-ret)
- }
- C.xtl_logger_destroy((*C.xentoollog_logger)(unsafe.Pointer(Ctx.logger)))
- return
-}
-
-func (Ctx *Context) CheckOpen() (err error) {
- if Ctx.ctx == nil {
- err = fmt.Errorf("Context not opened")
- }
- return
-}
-
//int libxl_get_max_cpus(libxl_ctx *ctx);
func (Ctx *Context) GetMaxCpus() (maxCpus int, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_get_max_cpus(Ctx.ctx)
if ret < 0 {
err = Error(-ret)
@@ -949,11 +865,6 @@ func (Ctx *Context) GetMaxCpus() (maxCpus int, err error) {
//int libxl_get_online_cpus(libxl_ctx *ctx);
func (Ctx *Context) GetOnlineCpus() (onCpus int, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_get_online_cpus(Ctx.ctx)
if ret < 0 {
err = Error(-ret)
@@ -965,10 +876,6 @@ func (Ctx *Context) GetOnlineCpus() (onCpus int, err
error) {
//int libxl_get_max_nodes(libxl_ctx *ctx);
func (Ctx *Context) GetMaxNodes() (maxNodes int, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
ret := C.libxl_get_max_nodes(Ctx.ctx)
if ret < 0 {
err = Error(-ret)
@@ -980,10 +887,6 @@ func (Ctx *Context) GetMaxNodes() (maxNodes int, err
error) {
//int libxl_get_free_memory(libxl_ctx *ctx, uint64_t *memkb);
func (Ctx *Context) GetFreeMemory() (memkb uint64, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
var cmem C.uint64_t
ret := C.libxl_get_free_memory(Ctx.ctx, &cmem)
@@ -999,10 +902,6 @@ func (Ctx *Context) GetFreeMemory() (memkb uint64, err
error) {
//int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo *physinfo)
func (Ctx *Context) GetPhysinfo() (physinfo *Physinfo, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
var cphys C.libxl_physinfo
C.libxl_physinfo_init(&cphys)
defer C.libxl_physinfo_dispose(&cphys)
@@ -1020,11 +919,6 @@ func (Ctx *Context) GetPhysinfo() (physinfo *Physinfo,
err error) {
//const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx);
func (Ctx *Context) GetVersionInfo() (info *VersionInfo, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var cinfo *C.libxl_version_info
cinfo = C.libxl_get_version_info(Ctx.ctx)
@@ -1035,11 +929,6 @@ func (Ctx *Context) GetVersionInfo() (info *VersionInfo,
err error) {
}
func (Ctx *Context) DomainInfo(Id Domid) (di *Dominfo, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var cdi C.libxl_dominfo
C.libxl_dominfo_init(&cdi)
defer C.libxl_dominfo_dispose(&cdi)
@@ -1057,11 +946,6 @@ func (Ctx *Context) DomainInfo(Id Domid) (di *Dominfo,
err error) {
}
func (Ctx *Context) DomainUnpause(Id Domid) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_domain_unpause(Ctx.ctx, C.uint32_t(Id), nil)
if ret != 0 {
@@ -1072,11 +956,6 @@ func (Ctx *Context) DomainUnpause(Id Domid) (err error) {
//int libxl_domain_pause(libxl_ctx *ctx, uint32_t domain);
func (Ctx *Context) DomainPause(id Domid) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_domain_pause(Ctx.ctx, C.uint32_t(id), nil)
if ret != 0 {
@@ -1087,11 +966,6 @@ func (Ctx *Context) DomainPause(id Domid) (err error) {
//int libxl_domain_shutdown(libxl_ctx *ctx, uint32_t domid);
func (Ctx *Context) DomainShutdown(id Domid) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_domain_shutdown(Ctx.ctx, C.uint32_t(id))
if ret != 0 {
@@ -1102,11 +976,6 @@ func (Ctx *Context) DomainShutdown(id Domid) (err error) {
//int libxl_domain_reboot(libxl_ctx *ctx, uint32_t domid);
func (Ctx *Context) DomainReboot(id Domid) (err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
ret := C.libxl_domain_reboot(Ctx.ctx, C.uint32_t(id))
if ret != 0 {
@@ -1118,11 +987,6 @@ func (Ctx *Context) DomainReboot(id Domid) (err error) {
//libxl_dominfo * libxl_list_domain(libxl_ctx*, int *nb_domain_out);
//void libxl_dominfo_list_free(libxl_dominfo *list, int nb_domain);
func (Ctx *Context) ListDomain() (glist []Dominfo) {
- err := Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var nbDomain C.int
clist := C.libxl_list_domain(Ctx.ctx, &nbDomain)
defer C.libxl_dominfo_list_free(clist, nbDomain)
@@ -1145,11 +1009,6 @@ func (Ctx *Context) ListDomain() (glist []Dominfo) {
// int *nb_vcpu, int *nr_cpus_out);
//void libxl_vcpuinfo_list_free(libxl_vcpuinfo *, int nr_vcpus);
func (Ctx *Context) ListVcpu(id Domid) (glist []Vcpuinfo) {
- err := Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var nbVcpu C.int
var nrCpu C.int
@@ -1180,11 +1039,6 @@ func (ct ConsoleType) String() (str string) {
//int libxl_console_get_tty(libxl_ctx *ctx, uint32_t domid, int cons_num,
//libxl_console_type type, char **path);
func (Ctx *Context) ConsoleGetTty(id Domid, consNum int, conType ConsoleType)
(path string, err error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var cpath *C.char
ret := C.libxl_console_get_tty(Ctx.ctx, C.uint32_t(id), C.int(consNum),
C.libxl_console_type(conType), &cpath)
if ret != 0 {
@@ -1200,11 +1054,6 @@ func (Ctx *Context) ConsoleGetTty(id Domid, consNum int,
conType ConsoleType) (p
//int libxl_primary_console_get_tty(libxl_ctx *ctx, uint32_t domid_vm,
// char **path);
func (Ctx *Context) PrimaryConsoleGetTty(domid uint32) (path string, err
error) {
- err = Ctx.CheckOpen()
- if err != nil {
- return
- }
-
var cpath *C.char
ret := C.libxl_primary_console_get_tty(Ctx.ctx, C.uint32_t(domid),
&cpath)
if ret != 0 {
--
2.19.1
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