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Merge pull request #11 from madhanrm/monitor
Adding Monitor and Events
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // +build windows | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT license. | ||
|
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| package event | ||
|
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||
| import ( | ||
| "github.com/microsoft/wmi/pkg/base/session" | ||
| wmi "github.com/microsoft/wmi/pkg/wmiinstance" | ||
| ) | ||
|
|
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| type CallbackContext struct { | ||
| callbackData string | ||
| callback func(*wmi.WmiInstance, string) | ||
| } | ||
|
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||
| // NewCallbackContext | ||
| func NewCallbackContext(cb func(*wmi.WmiInstance, string), data string) *CallbackContext { | ||
| return &CallbackContext{ | ||
| callback: cb, | ||
| callbackData: data, | ||
| } | ||
| } | ||
|
|
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| // Execute the callback | ||
| func (cb *CallbackContext) Execute(instance *wmi.WmiInstance) { | ||
| if cb.callback == nil { | ||
| return | ||
| } | ||
| cb.callback(instance, cb.callbackData) | ||
| } | ||
|
|
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| func onInstanceReady(ctx interface{}, wmiInstances []*wmi.WmiInstance) { | ||
| context := ctx.(*CallbackContext) | ||
| if context == nil { | ||
| return | ||
| } | ||
|
|
||
| if len(wmiInstances) < 1 { | ||
| return | ||
| } | ||
|
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| context.Execute(wmiInstances[0]) | ||
| } | ||
|
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| func onCompleted(ctx interface{}, wmiInstances []*wmi.WmiInstance) { | ||
| // Not used | ||
| } | ||
|
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| func onProgress(ctx interface{}, wmiInstances []*wmi.WmiInstance) { | ||
| // Not used | ||
| } | ||
|
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| func onInstancePut(ctx interface{}, wmiInstances []*wmi.WmiInstance) { | ||
| // Not used | ||
| } | ||
|
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| // RegisterWmiCallback | ||
| func RegisterWmiCallback(context *CallbackContext, wmiNamespace, hostName, queryString string) (eventSink *wmi.WmiEventSink, err error) { | ||
| wmiSession, err := session.GetSession(wmiNamespace, hostName, "", "", "") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| eventSink, err = wmi.CreateWmiEventSink(wmiSession, context, onInstanceReady, onCompleted, onProgress, onInstancePut) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer func() { | ||
| if err != nil { | ||
| eventSink.Close() | ||
| eventSink = nil | ||
| } | ||
| }() | ||
|
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| _, err = eventSink.Connect() | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
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| _, err = wmiSession.ExecNotificationQueryAsync(eventSink, queryString) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // +build windows | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT license. | ||
|
|
||
| package monitor | ||
|
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||
| import ( | ||
| "fmt" | ||
| "sync" | ||
|
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| "github.com/microsoft/wmi/pkg/base/event" | ||
| "github.com/microsoft/wmi/pkg/base/query" | ||
| "github.com/microsoft/wmi/pkg/constant" | ||
| wmi "github.com/microsoft/wmi/pkg/wmiinstance" | ||
| ) | ||
|
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| // Monitor is a generic monitor to subscribe to Wmi Events based on a Query String | ||
| type Monitor struct { | ||
| mux sync.Mutex | ||
| // eventSinks for each of the entities that are being monitored here | ||
| // multiple event sinks can be setup for a single entity | ||
| eventSinks map[string][]*wmi.WmiEventSink | ||
| propertyNameToQuery string | ||
| wmiNamespaceName string | ||
| callbackContext interface{} | ||
| callbackFunction func(interface{}, string) | ||
| } | ||
|
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| func (c *Monitor) onModified(instance *wmi.WmiInstance, cbData string) { | ||
| /* | ||
| prop, err := instance.GetProperty(c.propertyNameToQuery) | ||
| if err != nil { | ||
| fmt.Printf("Err: %v - [%s]\n", err, c.propertyNameToQuery) | ||
| return | ||
| } | ||
| propVal, ok := prop.(string) | ||
| if !ok { | ||
| return | ||
| } | ||
| */ | ||
| c.callbackFunction(c.callbackContext, cbData) | ||
| return | ||
| } | ||
|
|
||
| // CreateMonitor createa a new Monitor | ||
| func CreateMonitor(wmiNamespace string, callbackContext interface{}, | ||
| callback func(interface{}, string)) *Monitor { | ||
| return &Monitor{ | ||
| wmiNamespaceName: wmiNamespace, | ||
| eventSinks: map[string][]*wmi.WmiEventSink{}, | ||
| callbackFunction: callback, | ||
| callbackContext: callbackContext, | ||
| } | ||
| } | ||
|
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| // AddEntityWithFilter would add the entity to be monitored for changes | ||
| func (c *Monitor) AddEntityWithFilter(entityName, wqlQueryString string, filters query.WmiQueryFilterCollection) (err error) { | ||
| if _, ok := c.eventSinks[entityName]; ok { | ||
| return nil // error | ||
| } | ||
| qString := fmt.Sprintf("%s %s", wqlQueryString, filters.String()) | ||
| fmt.Printf("Event Query [%s]\n", qString) | ||
| esink, err := c.getEventSink(entityName, qString) | ||
| if err != nil { | ||
| return | ||
| } | ||
| c.mux.Lock() | ||
| defer c.mux.Unlock() | ||
| c.eventSinks[entityName] = append(c.eventSinks[entityName], esink) | ||
| return | ||
| } | ||
|
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| // RemoveEntity to remove the entity being monitored for changes | ||
| func (c *Monitor) RemoveEntity(entityName string) (err error) { | ||
| if _, ok := c.eventSinks[entityName]; !ok { | ||
| return nil // error NOT Found | ||
| } | ||
| c.mux.Lock() | ||
| defer c.mux.Unlock() | ||
|
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| delete(c.eventSinks, entityName) | ||
| return | ||
| } | ||
|
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| // Close the monitor | ||
| func (c *Monitor) Close() error { | ||
| for k := range c.eventSinks { | ||
| for _, s := range c.eventSinks[k] { | ||
| s.Close() | ||
| } | ||
| delete(c.eventSinks, k) | ||
| } | ||
| return nil | ||
| } | ||
|
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| // getEventSink | ||
| func (c *Monitor) getEventSink(entityName, wqlQueryString string) (*wmi.WmiEventSink, error) { | ||
| //qString := fmt.Sprintf("%s %s", queryString, additionalFilter) | ||
| context := event.NewCallbackContext(c.onModified, entityName) | ||
| return event.RegisterWmiCallback(context, c.wmiNamespaceName, constant.HostName, wqlQueryString) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT license. | ||
|
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||
| package constant | ||
|
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| type WMINamespace string | ||
|
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| const ( | ||
| Virtualization WMINamespace = "root/virtualization/v2" | ||
| CimV2 WMINamespace = "root/cimv2" | ||
| StadardCimV2 WMINamespace = "root/standardcimv2" | ||
| FailoverCluster WMINamespace = "root/mscluster" | ||
| ) | ||
|
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| const ( | ||
| HostName string = "localhost" | ||
| ) |
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