Merge pull request shirou#452 from leafnunes/master

prevent hang on pkg import if wmi.Query hangs

Author: shirou

cpu/cpu_windows.go

@@ -3,6 +3,7 @@
 package cpu
 
 import (
+	"context"
 	"fmt"
 	"unsafe"
 
@@ -81,8 +82,9 @@ func Info() ([]InfoStat, error) {
 	var ret []InfoStat
 	var dst []Win32_Processor
 	q := wmi.CreateQuery(&dst, "")
-	err := wmi.Query(q, &dst)
-	if err != nil {
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	if err := common.WMIQueryWithContext(ctx, q, &dst); err != nil {
 		return ret, err
 	}
 
@@ -113,8 +115,11 @@ func Info() ([]InfoStat, error) {
 // Name property is the key by which overall, per cpu and per core metric is known.
 func PerfInfo() ([]Win32_PerfFormattedData_Counters_ProcessorInformation, error) {
 	var ret []Win32_PerfFormattedData_Counters_ProcessorInformation
+
 	q := wmi.CreateQuery(&ret, "")
-	err := wmi.Query(q, &ret)
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, q, &ret)
 	return ret, err
 }
 
@@ -123,7 +128,9 @@ func PerfInfo() ([]Win32_PerfFormattedData_Counters_ProcessorInformation, error)
 func ProcInfo() ([]Win32_PerfFormattedData_PerfOS_System, error) {
 	var ret []Win32_PerfFormattedData_PerfOS_System
 	q := wmi.CreateQuery(&ret, "")
-	err := wmi.Query(q, &ret)
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, q, &ret)
 	return ret, err
 }
 

disk/disk_windows.go

@@ -4,9 +4,9 @@ package disk
 
 import (
 	"bytes"
+	"context"
 	"unsafe"
 
-	"github.com/StackExchange/wmi"
 	"github.com/shirou/gopsutil/internal/common"
 	"golang.org/x/sys/windows"
 )
@@ -132,7 +132,9 @@ func IOCounters(names ...string) (map[string]IOCountersStat, error) {
 	ret := make(map[string]IOCountersStat, 0)
 	var dst []Win32_PerfFormattedData
 
-	err := wmi.Query("SELECT * FROM Win32_PerfFormattedData_PerfDisk_LogicalDisk ", &dst)
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, "SELECT * FROM Win32_PerfFormattedData_PerfDisk_LogicalDisk", &dst)
 	if err != nil {
 		return ret, err
 	}

host/host_windows.go

@@ -3,6 +3,7 @@
 package host
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"runtime"
@@ -109,7 +110,9 @@ func getMachineGuid() (string, error) {
 func GetOSInfo() (Win32_OperatingSystem, error) {
 	var dst []Win32_OperatingSystem
 	q := wmi.CreateQuery(&dst, "")
-	err := wmi.Query(q, &dst)
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, q, &dst)
 	if err != nil {
 		return Win32_OperatingSystem{}, err
 	}

internal/common/common_windows.go

@@ -3,8 +3,10 @@
 package common
 
 import (
+	"context"
 	"unsafe"
 
+	"github.com/StackExchange/wmi"
 	"golang.org/x/sys/windows"
 )
 
@@ -49,7 +51,7 @@ var (
 	ModNt       = windows.NewLazyDLL("ntdll.dll")
 	ModPdh      = windows.NewLazyDLL("pdh.dll")
 	ModPsapi    = windows.NewLazyDLL("psapi.dll")
-	
+
 	ProcGetSystemTimes           = Modkernel32.NewProc("GetSystemTimes")
 	ProcNtQuerySystemInformation = ModNt.NewProc("NtQuerySystemInformation")
 	PdhOpenQuery                 = ModPdh.NewProc("PdhOpenQuery")
@@ -110,3 +112,18 @@ func CreateCounter(query windows.Handle, pname, cname string) (*CounterInfo, err
 		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 {
+	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
+	}
+}

process/process_windows.go

@@ -3,6 +3,7 @@
 package process
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"syscall"
@@ -130,8 +131,10 @@ func GetWin32Proc(pid int32) ([]Win32_Process, error) {
 	var dst []Win32_Process
 	query := fmt.Sprintf("WHERE ProcessId = %d", pid)
 	q := wmi.CreateQuery(&dst, query)
-
-	if err := wmi.Query(q, &dst); err != nil {
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, q, &dst)
+	if err != nil {
 		return []Win32_Process{}, fmt.Errorf("could not get win32Proc: %s", err)
 	}
 
@@ -333,7 +336,9 @@ func (p *Process) MemoryInfoEx() (*MemoryInfoExStat, error) {
 func (p *Process) Children() ([]*Process, error) {
 	var dst []Win32_Process
 	query := wmi.CreateQuery(&dst, fmt.Sprintf("Where ParentProcessId = %d", p.Pid))
-	err := wmi.Query(query, &dst)
+	ctx, cancel := context.WithTimeout(context.Background(), common.Timeout)
+	defer cancel()
+	err := common.WMIQueryWithContext(ctx, query, &dst)
 	if err != nil {
 		return nil, err
 	}