| // +build windows |
| |
| package common |
| |
| import ( |
| "context" |
| "unsafe" |
| |
| "github.com/StackExchange/wmi" |
| "golang.org/x/sys/windows" |
| ) |
| |
| // for double values |
| type PDH_FMT_COUNTERVALUE_DOUBLE struct { |
| CStatus uint32 |
| DoubleValue float64 |
| } |
| |
| // for 64 bit integer values |
| type PDH_FMT_COUNTERVALUE_LARGE struct { |
| CStatus uint32 |
| LargeValue int64 |
| } |
| |
| // for long values |
| type PDH_FMT_COUNTERVALUE_LONG struct { |
| CStatus uint32 |
| LongValue int32 |
| padding [4]byte |
| } |
| |
| // windows system const |
| const ( |
| ERROR_SUCCESS = 0 |
| ERROR_FILE_NOT_FOUND = 2 |
| DRIVE_REMOVABLE = 2 |
| DRIVE_FIXED = 3 |
| HKEY_LOCAL_MACHINE = 0x80000002 |
| RRF_RT_REG_SZ = 0x00000002 |
| RRF_RT_REG_DWORD = 0x00000010 |
| PDH_FMT_LONG = 0x00000100 |
| PDH_FMT_DOUBLE = 0x00000200 |
| PDH_FMT_LARGE = 0x00000400 |
| PDH_INVALID_DATA = 0xc0000bc6 |
| PDH_INVALID_HANDLE = 0xC0000bbc |
| PDH_NO_DATA = 0x800007d5 |
| ) |
| |
| var ( |
| Modkernel32 = windows.NewLazySystemDLL("kernel32.dll") |
| ModNt = windows.NewLazySystemDLL("ntdll.dll") |
| ModPdh = windows.NewLazySystemDLL("pdh.dll") |
| ModPsapi = windows.NewLazySystemDLL("psapi.dll") |
| |
| ProcGetSystemTimes = Modkernel32.NewProc("GetSystemTimes") |
| ProcNtQuerySystemInformation = ModNt.NewProc("NtQuerySystemInformation") |
| PdhOpenQuery = ModPdh.NewProc("PdhOpenQuery") |
| PdhAddCounter = ModPdh.NewProc("PdhAddCounterW") |
| PdhCollectQueryData = ModPdh.NewProc("PdhCollectQueryData") |
| PdhGetFormattedCounterValue = ModPdh.NewProc("PdhGetFormattedCounterValue") |
| PdhCloseQuery = ModPdh.NewProc("PdhCloseQuery") |
| ) |
| |
| type FILETIME struct { |
| DwLowDateTime uint32 |
| DwHighDateTime uint32 |
| } |
| |
| // borrowed from net/interface_windows.go |
| func BytePtrToString(p *uint8) string { |
| a := (*[10000]uint8)(unsafe.Pointer(p)) |
| i := 0 |
| for a[i] != 0 { |
| i++ |
| } |
| return string(a[:i]) |
| } |
| |
| // CounterInfo |
| // copied from https://github.com/mackerelio/mackerel-agent/ |
| type CounterInfo struct { |
| PostName string |
| CounterName string |
| Counter windows.Handle |
| } |
| |
| // CreateQuery XXX |
| // copied from https://github.com/mackerelio/mackerel-agent/ |
| func CreateQuery() (windows.Handle, error) { |
| var query windows.Handle |
| r, _, err := PdhOpenQuery.Call(0, 0, uintptr(unsafe.Pointer(&query))) |
| if r != 0 { |
| return 0, err |
| } |
| return query, nil |
| } |
| |
| // CreateCounter XXX |
| func CreateCounter(query windows.Handle, pname, cname string) (*CounterInfo, error) { |
| var counter windows.Handle |
| r, _, err := PdhAddCounter.Call( |
| uintptr(query), |
| uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(cname))), |
| 0, |
| uintptr(unsafe.Pointer(&counter))) |
| if r != 0 { |
| return nil, err |
| } |
| return &CounterInfo{ |
| PostName: pname, |
| CounterName: cname, |
| Counter: counter, |
| }, nil |
| } |
| |
| // WMIQueryWithContext - wraps wmi.Query with a timed-out context to avoid hanging |
| func WMIQueryWithContext(ctx context.Context, query string, dst interface{}, connectServerArgs ...interface{}) error { |
| if _, ok := ctx.Deadline(); !ok { |
| ctxTimeout, cancel := context.WithTimeout(ctx, Timeout) |
| defer cancel() |
| ctx = ctxTimeout |
| } |
| |
| errChan := make(chan error, 1) |
| go func() { |
| errChan <- wmi.Query(query, dst, connectServerArgs...) |
| }() |
| |
| select { |
| case <-ctx.Done(): |
| return ctx.Err() |
| case err := <-errChan: |
| return err |
| } |
| } |