forked from rgbkrk/libvirt-go
/
libvirt.go
133 lines (118 loc) · 3.09 KB
/
libvirt.go
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package libvirt
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"unsafe"
)
/*
#cgo LDFLAGS: -lvirt -ldl
#include <libvirt/libvirt.h>
#include <libvirt/virterror.h>
#include <stdlib.h>
*/
import "C"
type VirConnection struct {
ptr C.virConnectPtr
}
func NewVirConnection(uri string) (VirConnection, error) {
cUri := C.CString(uri)
defer C.free(unsafe.Pointer(cUri))
ptr := C.virConnectOpen(cUri)
if ptr == nil {
return VirConnection{}, errors.New(GetLastError())
}
obj := VirConnection{ptr: ptr}
return obj, nil
}
func GetLastError() string {
err := C.virGetLastError()
errMsg := fmt.Sprintf("[Code-%d] [Domain-%d] %s",
err.code, err.domain, C.GoString(err.message))
C.virResetError(err)
return errMsg
}
func (c *VirConnection) CloseConnection() error {
result := int(C.virConnectClose(c.ptr))
if result == -1 {
return errors.New(GetLastError())
}
return nil
}
func (c *VirConnection) GetCapabilities() (string, error) {
str := C.virConnectGetCapabilities(c.ptr)
if str == nil {
return "", errors.New(GetLastError())
}
capabilities := C.GoString(str)
C.free(unsafe.Pointer(str))
return capabilities, nil
}
func (c *VirConnection) GetNodeInfo() (VirNodeInfo, error) {
ni := VirNodeInfo{}
var ptr C.virNodeInfo
result := C.virNodeGetInfo(c.ptr, (*C.virNodeInfo)(unsafe.Pointer(&ptr)))
if result == -1 {
return ni, errors.New(GetLastError())
}
ni.ptr = ptr
return ni, nil
}
func (c *VirConnection) GetHostname() (string, error) {
str := C.virConnectGetHostname(c.ptr)
if str == nil {
return "", errors.New(GetLastError())
}
hostname := C.GoString(str)
C.free(unsafe.Pointer(str))
return hostname, nil
}
func (c *VirConnection) ListDefinedDomains() ([]string, error) {
var names [1024](*C.char)
namesPtr := unsafe.Pointer(&names)
numDomains := C.virConnectListDefinedDomains(
c.ptr,
(**C.char)(namesPtr),
1024)
if numDomains == -1 {
return nil, errors.New(GetLastError())
}
goNames := make([]string, numDomains)
for k := 0; k < int(numDomains); k++ {
goNames[k] = C.GoString(names[k])
C.free(unsafe.Pointer(names[k]))
}
return goNames, nil
}
func (c *VirConnection) ListDomains() ([]uint32, error) {
domainIds := make([]int, 1024)
domainIdsPtr := unsafe.Pointer(&domainIds)
numDomains := C.virConnectListDomains(c.ptr, (*C.int)(domainIdsPtr), 1024)
if numDomains == -1 {
return nil, errors.New(GetLastError())
}
domains := make([]uint32, numDomains)
gBytes := C.GoBytes(domainIdsPtr, C.int(numDomains*32))
buf := bytes.NewBuffer(gBytes)
for k := 0; k < int(numDomains); k++ {
binary.Read(buf, binary.LittleEndian, &domains[k])
}
return domains, nil
}
func (c *VirConnection) LookupDomainById(id uint32) (VirDomain, error) {
ptr := C.virDomainLookupByID(c.ptr, C.int(id))
if ptr == nil {
return VirDomain{}, errors.New(GetLastError())
}
return VirDomain{ptr: ptr}, nil
}
func (c *VirConnection) LookupDomainByName(id string) (VirDomain, error) {
cName := C.CString(id)
defer C.free(unsafe.Pointer(cName))
ptr := C.virDomainLookupByName(c.ptr, cName)
if ptr == nil {
return VirDomain{}, errors.New(GetLastError())
}
return VirDomain{ptr: ptr}, nil
}