528 lines
24 KiB
C#
528 lines
24 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="PeerObject.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Net.PeerToPeer.Collaboration
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{
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Threading;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Diagnostics;
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using System.Diagnostics.CodeAnalysis;
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using System.ComponentModel;
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using System.Runtime.Serialization;
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using System.Security.Permissions;
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/// <summary>
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/// This class handles all the functionality and events associated with the Collaboration
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/// Peer Object
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/// </summary>
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[Serializable]
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public class PeerObject : IDisposable, IEquatable<PeerObject>, ISerializable
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{
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private const int c_16K = 16384;
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private Guid m_id;
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private byte[] m_data;
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private PeerScope m_peerScope;
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private ISynchronizeInvoke m_synchronizingObject;
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//
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// Initialize on first access of this class
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//
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// <SecurityKernel Critical="True" Ring="1">
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.Initialize():System.Void" Ring="1" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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static PeerObject()
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{
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CollaborationHelperFunctions.Initialize();
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}
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public PeerObject()
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{
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m_id = Guid.NewGuid();
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}
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public PeerObject(Guid Id, byte[] data, PeerScope peerScope)
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{
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if ((data != null) && (data.Length > c_16K))
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throw new ArgumentException(SR.GetString(SR.Collab_ObjectDataSizeFailed), "data");
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m_id = Id;
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m_peerScope = peerScope;
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m_data = data;
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}
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/// <summary>
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/// Constructor to enable serialization
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/// </summary>
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[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter)]
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protected PeerObject(SerializationInfo serializationInfo, StreamingContext streamingContext)
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{
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m_id = (Guid) serializationInfo.GetValue("_Id", typeof(Guid));
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m_data = (byte[])serializationInfo.GetValue("_Data", typeof(byte[]));
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m_peerScope = (PeerScope) serializationInfo.GetInt32("_Scope");
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}
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public Guid Id
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{
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get{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return m_id;
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}
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set{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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m_id = value;
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}
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}
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public byte[] Data
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{
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get {
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return m_data;
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}
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set {
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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if ((value != null) && (value.Length > c_16K))
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throw new ArgumentException(SR.GetString(SR.Collab_ObjectDataSizeFailed));
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m_data = value;
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}
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}
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public PeerScope PeerScope
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{
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get {
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return m_peerScope;
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}
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set {
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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m_peerScope = value;
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}
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}
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/// <summary>
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/// Gets and set the object used to marshall event handlers calls for stand alone
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/// events
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/// </summary>
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[Browsable(false), DefaultValue(null), Description(SR.SynchronizingObject)]
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public ISynchronizeInvoke SynchronizingObject
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{
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get
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return m_synchronizingObject;
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}
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set
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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m_synchronizingObject = value;
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}
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}
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private event EventHandler<ObjectChangedEventArgs> m_objectChanged;
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public event EventHandler<ObjectChangedEventArgs> ObjectChanged
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{
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// <SecurityKernel Critical="True" Ring="1">
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// <ReferencesCritical Name="Method: AddObjectChangedEvent(EventHandler`1<System.Net.PeerToPeer.Collaboration.ObjectChangedEventArgs>):Void" Ring="1" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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add
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
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AddObjectChangedEvent(value);
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}
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// <SecurityKernel Critical="True" Ring="2">
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// <ReferencesCritical Name="Method: RemoveObjectChangedEvent(EventHandler`1<System.Net.PeerToPeer.Collaboration.ObjectChangedEventArgs>):Void" Ring="2" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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remove
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
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RemoveObjectChangedEvent(value);
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}
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}
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#region Object changed event variables
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private object m_lockObjChangedEvent;
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private object LockObjChangedEvent
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{
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get{
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if (m_lockObjChangedEvent == null){
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object o = new object();
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Interlocked.CompareExchange(ref m_lockObjChangedEvent, o, null);
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}
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return m_lockObjChangedEvent;
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}
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}
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private RegisteredWaitHandle m_regObjChangedWaitHandle;
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private AutoResetEvent m_objChangedEvent;
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private SafeCollabEvent m_safeObjChangedEvent;
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#endregion
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// <SecurityKernel Critical="True" Ring="0">
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// <SatisfiesLinkDemand Name="GCHandle.Alloc(System.Object,System.Runtime.InteropServices.GCHandleType):System.Runtime.InteropServices.GCHandle" />
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// <SatisfiesLinkDemand Name="GCHandle.AddrOfPinnedObject():System.IntPtr" />
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// <SatisfiesLinkDemand Name="WaitHandle.get_SafeWaitHandle():Microsoft.Win32.SafeHandles.SafeWaitHandle" />
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// <SatisfiesLinkDemand Name="GCHandle.Free():System.Void" />
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// <CallsSuppressUnmanagedCode Name="UnsafeCollabNativeMethods.PeerCollabRegisterEvent(Microsoft.Win32.SafeHandles.SafeWaitHandle,System.UInt32,System.Net.PeerToPeer.Collaboration.PEER_COLLAB_EVENT_REGISTRATION&,System.Net.PeerToPeer.Collaboration.SafeCollabEvent&):System.Int32" />
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// <ReferencesCritical Name="Method: ObjectChangedCallback(Object, Boolean):Void" Ring="1" />
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// <ReferencesCritical Name="Field: m_safeObjChangedEvent" Ring="1" />
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// <ReferencesCritical Name="Method: PeerToPeerException.CreateFromHr(System.String,System.Int32):System.Net.PeerToPeer.PeerToPeerException" Ring="1" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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private void AddObjectChangedEvent(EventHandler<ObjectChangedEventArgs> callback)
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{
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//
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// Register a wait handle if one has not been registered already
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//
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddObjectChanged() called.");
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lock (LockObjChangedEvent){
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if (m_objectChanged == null){
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if (m_id.Equals(Guid.Empty))
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throw (new PeerToPeerException(SR.GetString(SR.Collab_EmptyGuidError)));
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m_objChangedEvent = new AutoResetEvent(false);
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//
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// Register callback with a wait handle
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//
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m_regObjChangedWaitHandle = ThreadPool.RegisterWaitForSingleObject(m_objChangedEvent, //Event that triggers the callback
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new WaitOrTimerCallback(ObjectChangedCallback), //callback to be called
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null, //state to be passed
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-1, //Timeout - aplicable only for timers
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false //call us everytime the event is set
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);
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PEER_COLLAB_EVENT_REGISTRATION pcer = new PEER_COLLAB_EVENT_REGISTRATION();
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pcer.eventType = PeerCollabEventType.EndPointObjectChanged;
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GUID guid = CollaborationHelperFunctions.ConvertGuidToGUID(m_id);
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GCHandle guidHandle = GCHandle.Alloc(guid, GCHandleType.Pinned);
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//
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// Register event with collab
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//
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pcer.pInstance = guidHandle.AddrOfPinnedObject();
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try{
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int errorCode = UnsafeCollabNativeMethods.PeerCollabRegisterEvent(
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m_objChangedEvent.SafeWaitHandle,
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1,
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ref pcer,
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out m_safeObjChangedEvent);
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if (errorCode != 0){
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabRegisterEvent returned with errorcode {0}", errorCode);
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throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_ObjectChangedRegFailed), errorCode);
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}
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}
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finally{
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if (guidHandle.IsAllocated)
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guidHandle.Free();
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}
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}
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m_objectChanged += callback;
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}
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddObjectChanged() successful.");
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}
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// <SecurityKernel Critical="True" Ring="1">
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// <ReferencesCritical Name="Field: m_safeObjChangedEvent" Ring="1" />
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.CleanEventVars(System.Threading.RegisteredWaitHandle&,System.Net.PeerToPeer.Collaboration.SafeCollabEvent&,System.Threading.AutoResetEvent&):System.Void" Ring="1" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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private void RemoveObjectChangedEvent(EventHandler<ObjectChangedEventArgs> callback)
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{
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveObjectChanged() called.");
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lock (LockObjChangedEvent){
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m_objectChanged -= callback;
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if (m_objectChanged == null){
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CollaborationHelperFunctions.CleanEventVars(ref m_regObjChangedWaitHandle,
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ref m_safeObjChangedEvent,
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ref m_objChangedEvent);
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ObjectChangedEvent variables successful.");
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}
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}
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveObjectChanged() successful.");
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}
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protected virtual void OnObjectChanged(ObjectChangedEventArgs objChangedArgs)
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{
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EventHandler<ObjectChangedEventArgs> handlerCopy = m_objectChanged;
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if (handlerCopy != null){
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if (SynchronizingObject != null && SynchronizingObject.InvokeRequired)
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SynchronizingObject.BeginInvoke(handlerCopy, new object[] { this, objChangedArgs });
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else
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handlerCopy(this, objChangedArgs);
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Fired the object changed event callback.");
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}
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}
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//
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// Handles the callback when there is an object changed event from native collaboration
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//
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// <SecurityKernel Critical="True" Ring="0">
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// <SatisfiesLinkDemand Name="SafeHandle.get_IsInvalid():System.Boolean" />
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// <SatisfiesLinkDemand Name="SafeHandle.DangerousGetHandle():System.IntPtr" />
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// <SatisfiesLinkDemand Name="Marshal.PtrToStructure(System.IntPtr,System.Type):System.Object" />
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// <SatisfiesLinkDemand Name="SafeHandle.Dispose():System.Void" />
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// <CallsSuppressUnmanagedCode Name="UnsafeCollabNativeMethods.PeerCollabGetEventData(System.Net.PeerToPeer.Collaboration.SafeCollabEvent,System.Net.PeerToPeer.Collaboration.SafeCollabData&):System.Int32" />
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// <ReferencesCritical Name="Local eventData of type: SafeCollabData" Ring="1" />
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// <ReferencesCritical Name="Field: m_safeObjChangedEvent" Ring="1" />
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// <ReferencesCritical Name="Method: PeerToPeerException.CreateFromHr(System.String,System.Int32):System.Net.PeerToPeer.PeerToPeerException" Ring="1" />
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.ConvertPEER_OBJECTToPeerObject(System.Net.PeerToPeer.Collaboration.PEER_OBJECT):System.Net.PeerToPeer.Collaboration.PeerObject" Ring="1" />
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.ConvertPEER_ENDPOINTToPeerEndPoint(System.Net.PeerToPeer.Collaboration.PEER_ENDPOINT):System.Net.PeerToPeer.Collaboration.PeerEndPoint" Ring="1" />
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.ConvertPEER_CONTACTToPeerContact(System.Net.PeerToPeer.Collaboration.PEER_CONTACT):System.Net.PeerToPeer.Collaboration.PeerContact" Ring="2" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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private void ObjectChangedCallback(object state, bool timedOut)
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{
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SafeCollabData eventData = null ;
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int errorCode = 0;
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "ObjectChangedCallback() called.");
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while (true){
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ObjectChangedEventArgs objectChangedArgs = null;
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//
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// Get the event data for the fired event
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//
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try{
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lock (LockObjChangedEvent){
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if (m_safeObjChangedEvent.IsInvalid) return;
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errorCode = UnsafeCollabNativeMethods.PeerCollabGetEventData(m_safeObjChangedEvent,
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out eventData);
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}
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if (errorCode == UnsafeCollabReturnCodes.PEER_S_NO_EVENT_DATA)
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break;
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else if (errorCode != 0){
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabGetEventData returned with errorcode {0}", errorCode);
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throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_GetObjectChangedDataFailed), errorCode);
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}
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PEER_COLLAB_EVENT_DATA ped = (PEER_COLLAB_EVENT_DATA)Marshal.PtrToStructure(eventData.DangerousGetHandle(),
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typeof(PEER_COLLAB_EVENT_DATA));
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if (ped.eventType == PeerCollabEventType.EndPointObjectChanged){
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PEER_EVENT_OBJECT_CHANGED_DATA objData = ped.objectChangedData;
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PEER_OBJECT po = (PEER_OBJECT)Marshal.PtrToStructure(objData.pObject, typeof(PEER_OBJECT));
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PeerObject peerObject = CollaborationHelperFunctions.ConvertPEER_OBJECTToPeerObject(po);
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//
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// Check if the Guid of the fired app is indeed our guid
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//
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if (Guid.Equals(m_id, peerObject.Id)){
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PeerContact peerContact = null;
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PeerEndPoint peerEndPoint = null;
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if (objData.pContact != IntPtr.Zero){
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PEER_CONTACT pc = (PEER_CONTACT)Marshal.PtrToStructure(objData.pContact, typeof(PEER_CONTACT));
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peerContact = CollaborationHelperFunctions.ConvertPEER_CONTACTToPeerContact(pc);
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}
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if (objData.pEndPoint != IntPtr.Zero){
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PEER_ENDPOINT pe = (PEER_ENDPOINT)Marshal.PtrToStructure(objData.pEndPoint, typeof(PEER_ENDPOINT));
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peerEndPoint = CollaborationHelperFunctions.ConvertPEER_ENDPOINTToPeerEndPoint(pe);
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}
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objectChangedArgs = new ObjectChangedEventArgs(peerEndPoint,
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peerContact,
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objData.changeType,
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peerObject);
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}
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}
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}
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finally{
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if (eventData != null) eventData.Dispose();
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}
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//
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// Fire the callback with the marshalled event args data
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//
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if(objectChangedArgs != null)
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OnObjectChanged(objectChangedArgs);
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}
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Leaving ObjectChangedCallback().");
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}
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public bool Equals(PeerObject other)
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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if (other != null){
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return other.Id.Equals(Id);
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}
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return false;
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}
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public override bool Equals(object obj)
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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PeerObject comparandPeerObject = obj as PeerObject;
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if (comparandPeerObject != null){
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return comparandPeerObject.Id.Equals(Id);
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}
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return false;
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}
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public new static bool Equals(object objA, object objB)
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{
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PeerObject comparandPeerObject1 = objA as PeerObject;
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PeerObject comparandPeerObject2 = objB as PeerObject;
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if ((comparandPeerObject1 != null) && (comparandPeerObject2 != null)){
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return Guid.Equals(comparandPeerObject1.Id, comparandPeerObject2.Id);
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}
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return false;
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}
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public override int GetHashCode()
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return Id.GetHashCode();
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}
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public override string ToString()
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{
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if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
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return Id.ToString();
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}
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private bool m_Disposed;
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// <SecurityKernel Critical="True" Ring="2">
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// <ReferencesCritical Name="Method: Dispose(Boolean):Void" Ring="2" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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// <SecurityKernel Critical="True" Ring="1">
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// <ReferencesCritical Name="Field: m_safeObjChangedEvent" Ring="1" />
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// <ReferencesCritical Name="Method: CollaborationHelperFunctions.CleanEventVars(System.Threading.RegisteredWaitHandle&,System.Net.PeerToPeer.Collaboration.SafeCollabEvent&,System.Threading.AutoResetEvent&):System.Void" Ring="1" />
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// </SecurityKernel>
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[System.Security.SecurityCritical]
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protected virtual void Dispose(bool disposing)
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{
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if (!m_Disposed){
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CollaborationHelperFunctions.CleanEventVars(ref m_regObjChangedWaitHandle,
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ref m_safeObjChangedEvent,
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ref m_objChangedEvent);
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ObjectChangedEvent variables successful.");
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m_Disposed = true;
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}
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}
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// <SecurityKernel Critical="True" Ring="0">
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// <SatisfiesLinkDemand Name="GetObjectData(SerializationInfo, StreamingContext):Void" />
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// </SecurityKernel>
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[SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")]
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[System.Security.SecurityCritical]
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[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter, SerializationFormatter = true)]
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void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
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{
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GetObjectData(info, context);
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}
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/// <summary>
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/// This is made virtual so that derived types can be implemented correctly
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/// </summary>
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[SecurityPermission(SecurityAction.LinkDemand, SerializationFormatter = true)]
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protected virtual void GetObjectData(SerializationInfo info, StreamingContext context)
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{
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info.AddValue("_Id", m_id);
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info.AddValue("_Data", m_data);
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info.AddValue("_Scope", m_peerScope);
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}
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internal void TracePeerObject()
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{
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Contents of the PeerObject");
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tGuid: {0}", Id);
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Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tPeerScope: {0}", PeerScope);
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if (Data != null){
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|
if (Logging.P2PTraceSource.Switch.ShouldTrace(TraceEventType.Verbose)){
|
|
Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tObject data:");
|
|
Logging.DumpData(Logging.P2PTraceSource, TraceEventType.Verbose, Logging.P2PTraceSource.MaxDataSize, Data, 0, Data.Length);
|
|
}
|
|
else{
|
|
Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tObject data length {0}", Data.Length);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Manages collection of peer objects
|
|
//
|
|
[Serializable]
|
|
public class PeerObjectCollection : Collection<PeerObject>
|
|
{
|
|
internal PeerObjectCollection() { }
|
|
|
|
protected override void SetItem(int index, PeerObject item)
|
|
{
|
|
// nulls not allowed
|
|
if (item == null){
|
|
throw new ArgumentNullException("item");
|
|
}
|
|
base.SetItem(index, item);
|
|
}
|
|
|
|
protected override void InsertItem(int index, PeerObject item)
|
|
{
|
|
// nulls not allowed
|
|
if (item == null){
|
|
throw new ArgumentNullException("item");
|
|
}
|
|
base.InsertItem(index, item);
|
|
}
|
|
|
|
public override string ToString()
|
|
{
|
|
bool first = true;
|
|
StringBuilder builder = new StringBuilder();
|
|
|
|
foreach (PeerObject peerObject in this)
|
|
{
|
|
if (!first){
|
|
builder.Append(", ");
|
|
}
|
|
else{
|
|
first = false;
|
|
}
|
|
builder.Append(peerObject.ToString());
|
|
}
|
|
return builder.ToString();
|
|
}
|
|
}
|
|
}
|