1// +build windows 2 3package common 4 5import ( 6 "context" 7 "unsafe" 8 9 "github.com/StackExchange/wmi" 10 "golang.org/x/sys/windows" 11) 12 13// for double values 14type PDH_FMT_COUNTERVALUE_DOUBLE struct { 15 CStatus uint32 16 DoubleValue float64 17} 18 19// for 64 bit integer values 20type PDH_FMT_COUNTERVALUE_LARGE struct { 21 CStatus uint32 22 LargeValue int64 23} 24 25// for long values 26type PDH_FMT_COUNTERVALUE_LONG struct { 27 CStatus uint32 28 LongValue int32 29 padding [4]byte 30} 31 32// windows system const 33const ( 34 ERROR_SUCCESS = 0 35 ERROR_FILE_NOT_FOUND = 2 36 DRIVE_REMOVABLE = 2 37 DRIVE_FIXED = 3 38 HKEY_LOCAL_MACHINE = 0x80000002 39 RRF_RT_REG_SZ = 0x00000002 40 RRF_RT_REG_DWORD = 0x00000010 41 PDH_FMT_LONG = 0x00000100 42 PDH_FMT_DOUBLE = 0x00000200 43 PDH_FMT_LARGE = 0x00000400 44 PDH_INVALID_DATA = 0xc0000bc6 45 PDH_INVALID_HANDLE = 0xC0000bbc 46 PDH_NO_DATA = 0x800007d5 47) 48 49var ( 50 Modkernel32 = windows.NewLazySystemDLL("kernel32.dll") 51 ModNt = windows.NewLazySystemDLL("ntdll.dll") 52 ModPdh = windows.NewLazySystemDLL("pdh.dll") 53 ModPsapi = windows.NewLazySystemDLL("psapi.dll") 54 55 ProcGetSystemTimes = Modkernel32.NewProc("GetSystemTimes") 56 ProcNtQuerySystemInformation = ModNt.NewProc("NtQuerySystemInformation") 57 PdhOpenQuery = ModPdh.NewProc("PdhOpenQuery") 58 PdhAddCounter = ModPdh.NewProc("PdhAddCounterW") 59 PdhCollectQueryData = ModPdh.NewProc("PdhCollectQueryData") 60 PdhGetFormattedCounterValue = ModPdh.NewProc("PdhGetFormattedCounterValue") 61 PdhCloseQuery = ModPdh.NewProc("PdhCloseQuery") 62) 63 64type FILETIME struct { 65 DwLowDateTime uint32 66 DwHighDateTime uint32 67} 68 69// borrowed from net/interface_windows.go 70func BytePtrToString(p *uint8) string { 71 a := (*[10000]uint8)(unsafe.Pointer(p)) 72 i := 0 73 for a[i] != 0 { 74 i++ 75 } 76 return string(a[:i]) 77} 78 79// CounterInfo 80// copied from https://github.com/mackerelio/mackerel-agent/ 81type CounterInfo struct { 82 PostName string 83 CounterName string 84 Counter windows.Handle 85} 86 87// CreateQuery XXX 88// copied from https://github.com/mackerelio/mackerel-agent/ 89func CreateQuery() (windows.Handle, error) { 90 var query windows.Handle 91 r, _, err := PdhOpenQuery.Call(0, 0, uintptr(unsafe.Pointer(&query))) 92 if r != 0 { 93 return 0, err 94 } 95 return query, nil 96} 97 98// CreateCounter XXX 99func CreateCounter(query windows.Handle, pname, cname string) (*CounterInfo, error) { 100 var counter windows.Handle 101 r, _, err := PdhAddCounter.Call( 102 uintptr(query), 103 uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(cname))), 104 0, 105 uintptr(unsafe.Pointer(&counter))) 106 if r != 0 { 107 return nil, err 108 } 109 return &CounterInfo{ 110 PostName: pname, 111 CounterName: cname, 112 Counter: counter, 113 }, nil 114} 115 116// WMIQueryWithContext - wraps wmi.Query with a timed-out context to avoid hanging 117func WMIQueryWithContext(ctx context.Context, query string, dst interface{}, connectServerArgs ...interface{}) error { 118 if _, ok := ctx.Deadline(); !ok { 119 ctxTimeout, cancel := context.WithTimeout(ctx, Timeout) 120 defer cancel() 121 ctx = ctxTimeout 122 } 123 124 errChan := make(chan error, 1) 125 go func() { 126 errChan <- wmi.Query(query, dst, connectServerArgs...) 127 }() 128 129 select { 130 case <-ctx.Done(): 131 return ctx.Err() 132 case err := <-errChan: 133 return err 134 } 135} 136