From 05ade19302357eba6a24348f31df140ce0eca326 Mon Sep 17 00:00:00 2001 From: Kurkó Mihály Date: Tue, 23 Jan 2018 22:51:04 +0200 Subject: dashboard: CPU, memory, diskIO and traffic on the footer (#15950) * dashboard: footer, deep state update * dashboard: resolve asset path * dashboard: prevent state update on every reconnection * dashboard: fix linter issue * dashboard, cmd: minor UI fix, include commit hash * dashboard: gitCommit renamed to commit * dashboard: move the geth version to the right, make commit optional * dashboard: memory, traffic and CPU on footer * dashboard: fix merge * dashboard: CPU, diskIO on footer * dashboard: rename variables, use group declaration * dashboard: docs --- .../github.com/StackExchange/wmi/swbemservices.go | 260 +++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 vendor/github.com/StackExchange/wmi/swbemservices.go (limited to 'vendor/github.com/StackExchange/wmi/swbemservices.go') diff --git a/vendor/github.com/StackExchange/wmi/swbemservices.go b/vendor/github.com/StackExchange/wmi/swbemservices.go new file mode 100644 index 000000000..9765a53f7 --- /dev/null +++ b/vendor/github.com/StackExchange/wmi/swbemservices.go @@ -0,0 +1,260 @@ +// +build windows + +package wmi + +import ( + "fmt" + "reflect" + "runtime" + "sync" + + "github.com/go-ole/go-ole" + "github.com/go-ole/go-ole/oleutil" +) + +// SWbemServices is used to access wmi. See https://msdn.microsoft.com/en-us/library/aa393719(v=vs.85).aspx +type SWbemServices struct { + //TODO: track namespace. Not sure if we can re connect to a different namespace using the same instance + cWMIClient *Client //This could also be an embedded struct, but then we would need to branch on Client vs SWbemServices in the Query method + sWbemLocatorIUnknown *ole.IUnknown + sWbemLocatorIDispatch *ole.IDispatch + queries chan *queryRequest + closeError chan error + lQueryorClose sync.Mutex +} + +type queryRequest struct { + query string + dst interface{} + args []interface{} + finished chan error +} + +// InitializeSWbemServices will return a new SWbemServices object that can be used to query WMI +func InitializeSWbemServices(c *Client, connectServerArgs ...interface{}) (*SWbemServices, error) { + //fmt.Println("InitializeSWbemServices: Starting") + //TODO: implement connectServerArgs as optional argument for init with connectServer call + s := new(SWbemServices) + s.cWMIClient = c + s.queries = make(chan *queryRequest) + initError := make(chan error) + go s.process(initError) + + err, ok := <-initError + if ok { + return nil, err //Send error to caller + } + //fmt.Println("InitializeSWbemServices: Finished") + return s, nil +} + +// Close will clear and release all of the SWbemServices resources +func (s *SWbemServices) Close() error { + s.lQueryorClose.Lock() + if s == nil || s.sWbemLocatorIDispatch == nil { + s.lQueryorClose.Unlock() + return fmt.Errorf("SWbemServices is not Initialized") + } + if s.queries == nil { + s.lQueryorClose.Unlock() + return fmt.Errorf("SWbemServices has been closed") + } + //fmt.Println("Close: sending close request") + var result error + ce := make(chan error) + s.closeError = ce //Race condition if multiple callers to close. May need to lock here + close(s.queries) //Tell background to shut things down + s.lQueryorClose.Unlock() + err, ok := <-ce + if ok { + result = err + } + //fmt.Println("Close: finished") + return result +} + +func (s *SWbemServices) process(initError chan error) { + //fmt.Println("process: starting background thread initialization") + //All OLE/WMI calls must happen on the same initialized thead, so lock this goroutine + runtime.LockOSThread() + defer runtime.LockOSThread() + + err := ole.CoInitializeEx(0, ole.COINIT_MULTITHREADED) + if err != nil { + oleCode := err.(*ole.OleError).Code() + if oleCode != ole.S_OK && oleCode != S_FALSE { + initError <- fmt.Errorf("ole.CoInitializeEx error: %v", err) + return + } + } + defer ole.CoUninitialize() + + unknown, err := oleutil.CreateObject("WbemScripting.SWbemLocator") + if err != nil { + initError <- fmt.Errorf("CreateObject SWbemLocator error: %v", err) + return + } else if unknown == nil { + initError <- ErrNilCreateObject + return + } + defer unknown.Release() + s.sWbemLocatorIUnknown = unknown + + dispatch, err := s.sWbemLocatorIUnknown.QueryInterface(ole.IID_IDispatch) + if err != nil { + initError <- fmt.Errorf("SWbemLocator QueryInterface error: %v", err) + return + } + defer dispatch.Release() + s.sWbemLocatorIDispatch = dispatch + + // we can't do the ConnectServer call outside the loop unless we find a way to track and re-init the connectServerArgs + //fmt.Println("process: initialized. closing initError") + close(initError) + //fmt.Println("process: waiting for queries") + for q := range s.queries { + //fmt.Printf("process: new query: len(query)=%d\n", len(q.query)) + errQuery := s.queryBackground(q) + //fmt.Println("process: s.queryBackground finished") + if errQuery != nil { + q.finished <- errQuery + } + close(q.finished) + } + //fmt.Println("process: queries channel closed") + s.queries = nil //set channel to nil so we know it is closed + //TODO: I think the Release/Clear calls can panic if things are in a bad state. + //TODO: May need to recover from panics and send error to method caller instead. + close(s.closeError) +} + +// Query runs the WQL query using a SWbemServices instance and appends the values to dst. +// +// dst must have type *[]S or *[]*S, for some struct type S. Fields selected in +// the query must have the same name in dst. Supported types are all signed and +// unsigned integers, time.Time, string, bool, or a pointer to one of those. +// Array types are not supported. +// +// By default, the local machine and default namespace are used. These can be +// changed using connectServerArgs. See +// http://msdn.microsoft.com/en-us/library/aa393720.aspx for details. +func (s *SWbemServices) Query(query string, dst interface{}, connectServerArgs ...interface{}) error { + s.lQueryorClose.Lock() + if s == nil || s.sWbemLocatorIDispatch == nil { + s.lQueryorClose.Unlock() + return fmt.Errorf("SWbemServices is not Initialized") + } + if s.queries == nil { + s.lQueryorClose.Unlock() + return fmt.Errorf("SWbemServices has been closed") + } + + //fmt.Println("Query: Sending query request") + qr := queryRequest{ + query: query, + dst: dst, + args: connectServerArgs, + finished: make(chan error), + } + s.queries <- &qr + s.lQueryorClose.Unlock() + err, ok := <-qr.finished + if ok { + //fmt.Println("Query: Finished with error") + return err //Send error to caller + } + //fmt.Println("Query: Finished") + return nil +} + +func (s *SWbemServices) queryBackground(q *queryRequest) error { + if s == nil || s.sWbemLocatorIDispatch == nil { + return fmt.Errorf("SWbemServices is not Initialized") + } + wmi := s.sWbemLocatorIDispatch //Should just rename in the code, but this will help as we break things apart + //fmt.Println("queryBackground: Starting") + + dv := reflect.ValueOf(q.dst) + if dv.Kind() != reflect.Ptr || dv.IsNil() { + return ErrInvalidEntityType + } + dv = dv.Elem() + mat, elemType := checkMultiArg(dv) + if mat == multiArgTypeInvalid { + return ErrInvalidEntityType + } + + // service is a SWbemServices + serviceRaw, err := oleutil.CallMethod(wmi, "ConnectServer", q.args...) + if err != nil { + return err + } + service := serviceRaw.ToIDispatch() + defer serviceRaw.Clear() + + // result is a SWBemObjectSet + resultRaw, err := oleutil.CallMethod(service, "ExecQuery", q.query) + if err != nil { + return err + } + result := resultRaw.ToIDispatch() + defer resultRaw.Clear() + + count, err := oleInt64(result, "Count") + if err != nil { + return err + } + + enumProperty, err := result.GetProperty("_NewEnum") + if err != nil { + return err + } + defer enumProperty.Clear() + + enum, err := enumProperty.ToIUnknown().IEnumVARIANT(ole.IID_IEnumVariant) + if err != nil { + return err + } + if enum == nil { + return fmt.Errorf("can't get IEnumVARIANT, enum is nil") + } + defer enum.Release() + + // Initialize a slice with Count capacity + dv.Set(reflect.MakeSlice(dv.Type(), 0, int(count))) + + var errFieldMismatch error + for itemRaw, length, err := enum.Next(1); length > 0; itemRaw, length, err = enum.Next(1) { + if err != nil { + return err + } + + err := func() error { + // item is a SWbemObject, but really a Win32_Process + item := itemRaw.ToIDispatch() + defer item.Release() + + ev := reflect.New(elemType) + if err = s.cWMIClient.loadEntity(ev.Interface(), item); err != nil { + if _, ok := err.(*ErrFieldMismatch); ok { + // We continue loading entities even in the face of field mismatch errors. + // If we encounter any other error, that other error is returned. Otherwise, + // an ErrFieldMismatch is returned. + errFieldMismatch = err + } else { + return err + } + } + if mat != multiArgTypeStructPtr { + ev = ev.Elem() + } + dv.Set(reflect.Append(dv, ev)) + return nil + }() + if err != nil { + return err + } + } + //fmt.Println("queryBackground: Finished") + return errFieldMismatch +} -- cgit