Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame] | 1 | // +build windows |
| 2 | |
| 3 | package common |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "unsafe" |
| 8 | |
| 9 | "github.com/StackExchange/wmi" |
| 10 | "golang.org/x/sys/windows" |
| 11 | ) |
| 12 | |
| 13 | // for double values |
| 14 | type PDH_FMT_COUNTERVALUE_DOUBLE struct { |
| 15 | CStatus uint32 |
| 16 | DoubleValue float64 |
| 17 | } |
| 18 | |
| 19 | // for 64 bit integer values |
| 20 | type PDH_FMT_COUNTERVALUE_LARGE struct { |
| 21 | CStatus uint32 |
| 22 | LargeValue int64 |
| 23 | } |
| 24 | |
| 25 | // for long values |
| 26 | type PDH_FMT_COUNTERVALUE_LONG struct { |
| 27 | CStatus uint32 |
| 28 | LongValue int32 |
| 29 | padding [4]byte |
| 30 | } |
| 31 | |
| 32 | // windows system const |
| 33 | const ( |
| 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 | |
| 49 | var ( |
| 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 | |
| 64 | type FILETIME struct { |
| 65 | DwLowDateTime uint32 |
| 66 | DwHighDateTime uint32 |
| 67 | } |
| 68 | |
| 69 | // borrowed from net/interface_windows.go |
| 70 | func 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/ |
| 81 | type 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/ |
| 89 | func 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 |
| 99 | func 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 |
| 117 | func 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 | } |