// -----------------------------------------------------------------------
-// <copyright file="RestClient.cs" company="Microsoft">
-// TODO: Update copyright text.
+// <copyright file="RestClient.cs" company="GRNet">
+// Copyright 2011-2012 GRNET S.A. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or
+// without modification, are permitted provided that the following
+// conditions are met:
+//
+// 1. Redistributions of source code must retain the above
+// copyright notice, this list of conditions and the following
+// disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials
+// provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// The views and conclusions contained in the software and
+// documentation are those of the authors and should not be
+// interpreted as representing official policies, either expressed
+// or implied, of GRNET S.A.
// </copyright>
// -----------------------------------------------------------------------
using System.Threading.Tasks;
using log4net;
+
namespace Pithos.Network
{
using System;
this.Proxy = other.Proxy;
}
+
protected override WebRequest GetWebRequest(Uri address)
{
TimedOut = false;
- var webRequest = base.GetWebRequest(address);
+ var webRequest = base.GetWebRequest(address);
var request = (HttpWebRequest)webRequest;
+ request.ServicePoint.ConnectionLimit = 50;
if (IfModifiedSince.HasValue)
request.IfModifiedSince = IfModifiedSince.Value;
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
public DateTime? IfModifiedSince { get; set; }
+ //Asynchronous version
protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
{
- return ProcessResponse(()=>base.GetWebResponse(request, result));
- }
+ Log.InfoFormat("ASYNC [{0}] {1}",request.Method, request.RequestUri);
+ HttpWebResponse response = null;
+
+ try
+ {
+ response = (HttpWebResponse)base.GetWebResponse(request, result);
+ }
+ catch (WebException exc)
+ {
+ if (!TryGetResponse(exc, out response))
+ throw;
+ }
+
+ StatusCode = response.StatusCode;
+ LastModified = response.LastModified;
+ StatusDescription = response.StatusDescription;
+ return response;
- protected override WebResponse GetWebResponse(WebRequest request)
- {
- return ProcessResponse(() => base.GetWebResponse(request));
}
+
- private WebResponse ProcessResponse(Func<WebResponse> getResponse)
+ //Synchronous version
+ protected override WebResponse GetWebResponse(WebRequest request)
{
+ HttpWebResponse response = null;
try
- {
- var response = (HttpWebResponse)getResponse();
- StatusCode = response.StatusCode;
- LastModified = response.LastModified;
- StatusDescription = response.StatusDescription;
- return response;
+ {
+ response = (HttpWebResponse)base.GetWebResponse(request);
}
catch (WebException exc)
{
- if (exc.Response != null)
- {
- var response = (exc.Response as HttpWebResponse);
- if (AllowedStatusCodes.Contains(response.StatusCode))
- {
- StatusCode = response.StatusCode;
- LastModified = response.LastModified;
- StatusDescription = response.StatusDescription;
+ if (!TryGetResponse(exc, out response))
+ throw;
+ }
- return response;
- }
- if (exc.Response.ContentLength > 0)
- {
- string content = GetContent(exc.Response);
- Log.ErrorFormat(content);
- }
- }
- throw;
+ StatusCode = response.StatusCode;
+ LastModified = response.LastModified;
+ StatusDescription = response.StatusDescription;
+ return response;
+ }
+
+ private bool TryGetResponse(WebException exc, out HttpWebResponse response)
+ {
+ response = null;
+ //Fail on empty response
+ if (exc.Response == null)
+ return false;
+
+ response = (exc.Response as HttpWebResponse);
+ //Succeed on allowed status codes
+ if (AllowedStatusCodes.Contains(response.StatusCode))
+ return true;
+
+ //Does the response have any content to log?
+ if (exc.Response.ContentLength > 0)
+ {
+ var content = LogContent(exc.Response);
+ Log.ErrorFormat(content);
}
+ return false;
}
- private readonly List<HttpStatusCode> _allowedStatusCodes=new List<HttpStatusCode>{HttpStatusCode.NotModified};
+ private readonly List<HttpStatusCode> _allowedStatusCodes=new List<HttpStatusCode>{HttpStatusCode.NotModified};
+
public List<HttpStatusCode> AllowedStatusCodes
{
get
public DateTime LastModified { get; private set; }
- private static string GetContent(WebResponse webResponse)
+ private static string LogContent(WebResponse webResponse)
{
if (webResponse == null)
throw new ArgumentNullException("webResponse");
Contract.EndContractBlock();
- string content;
- using (var stream = webResponse.GetResponseStream())
- using (var reader = new StreamReader(stream))
+ //The response stream must be copied to avoid affecting other code by disposing of the
+ //original response stream.
+ var stream = webResponse.GetResponseStream();
+ using(var memStream=new MemoryStream())
+ using (var reader = new StreamReader(memStream))
{
- content = reader.ReadToEnd();
+ stream.CopyTo(memStream);
+ string content = reader.ReadToEnd();
+
+ stream.Seek(0,SeekOrigin.Begin);
+ return content;
}
- return content;
}
public string DownloadStringWithRetry(string address,int retries=0)
{
+
if (address == null)
throw new ArgumentNullException("address");
TraceStart("GET",actualAddress);
var actualRetries = (retries == 0) ? Retries : retries;
-
-
+ var uriString = String.Join("/", BaseAddress.TrimEnd('/'), actualAddress);
+
var task = Retry(() =>
- {
- var uriString = String.Join("/", BaseAddress.TrimEnd('/'), actualAddress);
+ {
var content = base.DownloadString(uriString);
if (StatusCode == HttpStatusCode.NoContent)
}, actualRetries);
- var result = task.Result;
- return result;
+ try
+ {
+ var result = task.Result;
+ return result;
+
+ }
+ catch (AggregateException exc)
+ {
+ //If the task fails, propagate the original exception
+ if (exc.InnerException!=null)
+ throw exc.InnerException;
+ throw;
+ }
}
public void Head(string address,int retries=0)
RetryWithoutContent(address, retries, "DELETE");
}
- public string GetHeaderValue(string headerName)
+ public string GetHeaderValue(string headerName,bool optional=false)
{
if (this.ResponseHeaders==null)
throw new InvalidOperationException("ResponseHeaders are null");
Contract.EndContractBlock();
var values=this.ResponseHeaders.GetValues(headerName);
- if (values == null)
- throw new WebException(String.Format("The {0} header is missing", headerName));
- else
+ if (values != null)
return values[0];
+
+ if (optional)
+ return null;
+ //A required header was not found
+ throw new WebException(String.Format("The {0} header is missing", headerName));
+ }
+
+ public void SetNonEmptyHeaderValue(string headerName, string value)
+ {
+ if (String.IsNullOrWhiteSpace(value))
+ return;
+ Headers.Add(headerName,value);
}
private void RetryWithoutContent(string address, int retries, string method)
TraceStart(method, uriString);
if (method == "PUT")
request.ContentLength = 0;
+
+ //Have to use try/finally instead of using here, because WebClient needs a valid WebResponse object
+ //in order to return response headers
var response = (HttpWebResponse)GetWebResponse(request);
- StatusCode = response.StatusCode;
- StatusDescription = response.StatusDescription;
+ try
+ {
+ LastModified = response.LastModified;
+ StatusCode = response.StatusCode;
+ StatusDescription = response.StatusDescription;
+ }
+ finally
+ {
+ response.Close();
+ }
return 0;
{
Log.ErrorFormat("[{0}] FAILED for {1} with \n{2}", method, address, exc);
}
- throw;
+ throw exc;
}
catch(Exception ex)
var builder = new UriBuilder(String.Join("/", BaseAddress, container, objectName));
return builder;
}
+
+ public Dictionary<string, string> GetMeta(string metaPrefix)
+ {
+ if (String.IsNullOrWhiteSpace(metaPrefix))
+ throw new ArgumentNullException("metaPrefix");
+ Contract.EndContractBlock();
+
+ var keys = ResponseHeaders.AllKeys.AsQueryable();
+ var dict = (from key in keys
+ where key.StartsWith(metaPrefix)
+ let name = key.Substring(metaPrefix.Length)
+ select new { Name = name, Value = ResponseHeaders[key] })
+ .ToDictionary(t => t.Name, t => t.Value);
+ return dict;
+ }
}
public class RetryException:Exception
projects / pithos-ms-client / blobdiff