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//
// System.Net.ServicePointManager
//
// Author:
// Lawrence Pit (loz@cable.a2000.nl)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Configuration;
using System.Net.Configuration;
using System.Security.Cryptography.X509Certificates;
//
// notes:
// A service point manager manages service points (duh!).
// A service point maintains a list of connections (per scheme + authority).
// According to HttpWebRequest.ConnectionGroupName each connection group
// creates additional connections. therefor, a service point has a hashtable
// of connection groups where each value is a list of connections.
//
// when we need to make an HttpWebRequest, we need to do the following:
// 1. find service point, given Uri and Proxy
// 2. find connection group, given service point and group name
// 3. find free connection in connection group, or create one (if ok due to limits)
// 4. lease connection
// 5. execute request
// 6. when finished, return connection
//
namespace System.Net
{
public class ServicePointManager
{
private static HybridDictionary servicePoints = new HybridDictionary ();
// Static properties
private static ICertificatePolicy policy = new DefaultCertificatePolicy ();
private static int defaultConnectionLimit = DefaultPersistentConnectionLimit;
private static int maxServicePointIdleTime = 900000; // 15 minutes
private static int maxServicePoints = 0;
private static bool _checkCRL = false;
#if (NET_1_0 || NET_1_1)
private static SecurityProtocolType _securityProtocol = SecurityProtocolType.Ssl3;
#else
private static SecurityProtocolType _securityProtocol = SecurityProtocolType.Default;
#endif
#if NET_1_1
static bool expectContinue = true;
static bool useNagle;
#endif
// Fields
public const int DefaultNonPersistentConnectionLimit = 4;
public const int DefaultPersistentConnectionLimit = 2;
const string configKey = "system.net/connectionManagement";
static ConnectionManagementData manager;
static ServicePointManager ()
{
manager = (ConnectionManagementData) ConfigurationSettings.GetConfig (configKey);
}
// Constructors
private ServicePointManager ()
{
}
// Properties
public static ICertificatePolicy CertificatePolicy {
get { return policy; }
set { policy = value; }
}
#if NET_1_0
// we need it for SslClientStream
internal
#else
[MonoTODO("CRL checks not implemented")]
public
#endif
static bool CheckCertificateRevocationList {
get { return _checkCRL; }
set { _checkCRL = false; } // TODO - don't yet accept true
}
public static int DefaultConnectionLimit {
get { return defaultConnectionLimit; }
set {
if (value <= 0)
throw new ArgumentOutOfRangeException ("value");
defaultConnectionLimit = value;
}
}
public static int MaxServicePointIdleTime {
get {
return maxServicePointIdleTime;
}
set {
if (value < -2 || value > Int32.MaxValue)
throw new ArgumentOutOfRangeException ("value");
maxServicePointIdleTime = value;
}
}
public static int MaxServicePoints {
get {
return maxServicePoints;
}
set {
if (value < 0)
throw new ArgumentException ("value");
maxServicePoints = value;
RecycleServicePoints ();
}
}
#if NET_1_0
// we need it for SslClientStream
internal
#else
public
#endif
static SecurityProtocolType SecurityProtocol {
get { return _securityProtocol; }
set { _securityProtocol = value; }
}
#if NET_1_1
public static bool Expect100Continue {
get { return expectContinue; }
set { expectContinue = value; }
}
public static bool UseNagleAlgorithm {
get { return useNagle; }
set { useNagle = value; }
}
#endif
// Methods
public static ServicePoint FindServicePoint (Uri address)
{
return FindServicePoint (address, GlobalProxySelection.Select);
}
public static ServicePoint FindServicePoint (string uriString, IWebProxy proxy)
{
return FindServicePoint (new Uri(uriString), proxy);
}
public static ServicePoint FindServicePoint (Uri address, IWebProxy proxy)
{
if (address == null)
throw new ArgumentNullException ("address");
RecycleServicePoints ();
bool usesProxy = false;
if (proxy != null && !proxy.IsBypassed(address)) {
usesProxy = true;
address = proxy.GetProxy (address);
if (address.Scheme != "http" && address.Scheme != "https")
throw new NotSupportedException ("Proxy scheme not supported.");
}
address = new Uri (address.Scheme + "://" + address.Authority);
ServicePoint sp = null;
lock (servicePoints) {
sp = servicePoints [address] as ServicePoint;
if (sp != null)
return sp;
if (maxServicePoints > 0 && servicePoints.Count >= maxServicePoints)
throw new InvalidOperationException ("maximum number of service points reached");
string addr = address.ToString ();
int limit = (int) manager.GetMaxConnections (addr);
sp = new ServicePoint (address, limit, maxServicePointIdleTime);
#if NET_1_1
sp.Expect100Continue = expectContinue;
sp.UseNagleAlgorithm = useNagle;
#endif
sp.UsesProxy = usesProxy;
servicePoints.Add (address, sp);
}
return sp;
}
// Internal Methods
internal static void RecycleServicePoints ()
{
ArrayList toRemove = new ArrayList ();
lock (servicePoints) {
IDictionaryEnumerator e = servicePoints.GetEnumerator ();
while (e.MoveNext ()) {
ServicePoint sp = (ServicePoint) e.Value;
if (sp.AvailableForRecycling) {
toRemove.Add (e.Key);
}
}
for (int i = 0; i < toRemove.Count; i++)
servicePoints.Remove (toRemove [i]);
if (maxServicePoints == 0 || servicePoints.Count <= maxServicePoints)
return;
// get rid of the ones with the longest idle time
SortedList list = new SortedList (servicePoints.Count);
e = servicePoints.GetEnumerator ();
while (e.MoveNext ()) {
ServicePoint sp = (ServicePoint) e.Value;
if (sp.CurrentConnections == 0) {
while (list.ContainsKey (sp.IdleSince))
sp.IdleSince.AddMilliseconds (1);
list.Add (sp.IdleSince, sp.Address);
}
}
for (int i = 0; i < list.Count && servicePoints.Count > maxServicePoints; i++)
servicePoints.Remove (list.GetByIndex (i));
}
}
}
}
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