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