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disk.go
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disk.go
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// +build windows
package windows
import (
"fmt"
"syscall"
"time"
"unsafe"
"github.com/mackerelio/mackerel-agent/logging"
"github.com/mackerelio/mackerel-agent/metrics"
. "github.com/mackerelio/mackerel-agent/util/windows"
)
type DiskGenerator struct {
Interval time.Duration
query syscall.Handle
counters []*CounterInfo
}
var diskLogger = logging.GetLogger("metrics.disk")
func NewDiskGenerator(interval time.Duration) (*DiskGenerator, error) {
g := &DiskGenerator{interval, 0, nil}
var err error
g.query, err = CreateQuery()
if err != nil {
diskLogger.Criticalf(err.Error())
return nil, err
}
drivebuf := make([]byte, 256)
_, r, err := GetLogicalDriveStrings.Call(
uintptr(len(drivebuf)),
uintptr(unsafe.Pointer(&drivebuf[0])))
if r != 0 {
diskLogger.Criticalf(err.Error())
return nil, err
}
for _, v := range drivebuf {
if v >= 65 && v <= 90 {
drive := string(v)
r, _, err = GetDriveType.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(drive + `:\`))))
if r != DRIVE_FIXED {
continue
}
var counter *CounterInfo
counter, err = CreateCounter(
g.query,
fmt.Sprintf(`disk.%s.reads.delta`, drive),
fmt.Sprintf(`\PhysicalDisk(0 %s:)\Disk Reads/sec`, drive))
if err != nil {
diskLogger.Criticalf(err.Error())
return nil, err
}
g.counters = append(g.counters, counter)
counter, err = CreateCounter(
g.query,
fmt.Sprintf(`disk.%s.writes.delta`, drive),
fmt.Sprintf(`\PhysicalDisk(0 %s:)\Disk Writes/sec`, drive))
if err != nil {
diskLogger.Criticalf(err.Error())
return nil, err
}
g.counters = append(g.counters, counter)
}
}
r, _, err = PdhCollectQueryData.Call(uintptr(g.query))
if r != 0 && err != nil {
diskLogger.Criticalf(err.Error())
return nil, err
}
return g, nil
}
func (g *DiskGenerator) Generate() (metrics.Values, error) {
interval := g.Interval * time.Second
time.Sleep(interval)
r, _, err := PdhCollectQueryData.Call(uintptr(g.query))
if r != 0 {
return nil, err
}
results := make(map[string]float64)
for _, v := range g.counters {
var value PDH_FMT_COUNTERVALUE_ITEM_DOUBLE
r, _, err = PdhGetFormattedCounterValue.Call(uintptr(v.Counter), PDH_FMT_DOUBLE, uintptr(0), uintptr(unsafe.Pointer(&value)))
if r != 0 && r != PDH_INVALID_DATA {
return nil, err
}
results[v.PostName] = value.FmtValue.DoubleValue
}
return results, nil
}