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made some improvements to the base http handler

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LukePulverenti Luke Pulverenti luke pulverenti
2012-09-19 12:51:37 -04:00
parent 19e202d5e1
commit d8c01ded6e
14 changed files with 182 additions and 433 deletions
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148
MediaBrowser.Common/Net/Handlers/BaseHandler.cs
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@@ -112,32 +112,6 @@ namespace MediaBrowser.Common.Net.Handlers
}
}
/// <summary>
/// Gets the MIME type to include in the response headers
/// </summary>
public abstract Task<string> GetContentType();
/// <summary>
/// Gets the status code to include in the response headers
/// </summary>
protected int StatusCode { get; set; }
/// <summary>
/// Gets the cache duration to include in the response headers
/// </summary>
public virtual TimeSpan CacheDuration
{
get
{
return TimeSpan.FromTicks(0);
}
}
public virtual bool ShouldCompressResponse(string contentType)
{
return true;
}
private bool ClientSupportsCompression
{
get
@@ -186,22 +160,21 @@ namespace MediaBrowser.Common.Net.Handlers
ctx.Response.Headers["Accept-Ranges"] = "bytes";
}
// Set the initial status code
// When serving a range request, we need to return status code 206 to indicate a partial response body
StatusCode = SupportsByteRangeRequests && IsRangeRequest ? 206 : 200;
ResponseInfo responseInfo = await GetResponseInfo().ConfigureAwait(false);
ctx.Response.ContentType = await GetContentType().ConfigureAwait(false);
string etag = await GetETag().ConfigureAwait(false);
if (!string.IsNullOrEmpty(etag))
if (responseInfo.IsResponseValid)
{
ctx.Response.Headers["ETag"] = etag;
// Set the initial status code
// When serving a range request, we need to return status code 206 to indicate a partial response body
responseInfo.StatusCode = SupportsByteRangeRequests && IsRangeRequest ? 206 : 200;
}
TimeSpan cacheDuration = CacheDuration;
ctx.Response.ContentType = responseInfo.ContentType;
DateTime? lastDateModified = await GetLastDateModified().ConfigureAwait(false);
if (!string.IsNullOrEmpty(responseInfo.Etag))
{
ctx.Response.Headers["ETag"] = responseInfo.Etag;
}
if (ctx.Request.Headers.AllKeys.Contains("If-Modified-Since"))
{
@@ -210,30 +183,26 @@ namespace MediaBrowser.Common.Net.Handlers
if (DateTime.TryParse(ctx.Request.Headers["If-Modified-Since"], out ifModifiedSince))
{
// If the cache hasn't expired yet just return a 304
if (IsCacheValid(ifModifiedSince.ToUniversalTime(), cacheDuration, lastDateModified))
if (IsCacheValid(ifModifiedSince.ToUniversalTime(), responseInfo.CacheDuration, responseInfo.DateLastModified))
{
// ETag must also match (if supplied)
if ((etag ?? string.Empty).Equals(ctx.Request.Headers["If-None-Match"] ?? string.Empty))
if ((responseInfo.Etag ?? string.Empty).Equals(ctx.Request.Headers["If-None-Match"] ?? string.Empty))
{
StatusCode = 304;
responseInfo.StatusCode = 304;
}
}
}
}
await PrepareResponse().ConfigureAwait(false);
Logger.LogInfo("Responding with status code {0} for url {1}", responseInfo.StatusCode, url);
Logger.LogInfo("Responding with status code {0} for url {1}", StatusCode, url);
if (IsResponseValid)
if (responseInfo.IsResponseValid)
{
bool compressResponse = ShouldCompressResponse(ctx.Response.ContentType) && ClientSupportsCompression;
await ProcessUncachedRequest(ctx, compressResponse, cacheDuration, lastDateModified).ConfigureAwait(false);
await ProcessUncachedRequest(ctx, responseInfo).ConfigureAwait(false);
}
else
{
ctx.Response.StatusCode = StatusCode;
ctx.Response.StatusCode = responseInfo.StatusCode;
ctx.Response.SendChunked = false;
}
}
@@ -250,7 +219,7 @@ namespace MediaBrowser.Common.Net.Handlers
}
}
private async Task ProcessUncachedRequest(HttpListenerContext ctx, bool compressResponse, TimeSpan cacheDuration, DateTime? lastDateModified)
private async Task ProcessUncachedRequest(HttpListenerContext ctx, ResponseInfo responseInfo)
{
long? totalContentLength = TotalContentLength;
@@ -269,22 +238,29 @@ namespace MediaBrowser.Common.Net.Handlers
ctx.Response.ContentLength64 = totalContentLength.Value;
}
var compressResponse = responseInfo.CompressResponse && ClientSupportsCompression;
// Add the compression header
if (compressResponse)
{
ctx.Response.AddHeader("Content-Encoding", CompressionMethod);
}
// Add caching headers
if (cacheDuration.Ticks > 0)
if (responseInfo.DateLastModified.HasValue)
{
CacheResponse(ctx.Response, cacheDuration, lastDateModified);
ctx.Response.Headers[HttpResponseHeader.LastModified] = responseInfo.DateLastModified.Value.ToString("r");
}
// Add caching headers
if (responseInfo.CacheDuration.Ticks > 0)
{
CacheResponse(ctx.Response, responseInfo.CacheDuration);
}
// Set the status code
ctx.Response.StatusCode = StatusCode;
ctx.Response.StatusCode = responseInfo.StatusCode;
if (IsResponseValid)
if (responseInfo.IsResponseValid)
{
// Finally, write the response data
Stream outputStream = ctx.Response.OutputStream;
@@ -311,28 +287,10 @@ namespace MediaBrowser.Common.Net.Handlers
}
}
private void CacheResponse(HttpListenerResponse response, TimeSpan duration, DateTime? dateModified)
private void CacheResponse(HttpListenerResponse response, TimeSpan duration)
{
DateTime now = DateTime.UtcNow;
DateTime lastModified = dateModified ?? now;
response.Headers[HttpResponseHeader.CacheControl] = "public, max-age=" + Convert.ToInt32(duration.TotalSeconds);
response.Headers[HttpResponseHeader.Expires] = now.Add(duration).ToString("r");
response.Headers[HttpResponseHeader.LastModified] = lastModified.ToString("r");
}
protected virtual Task<string> GetETag()
{
return Task.FromResult<string>(string.Empty);
}
/// <summary>
/// Gives subclasses a chance to do any prep work, and also to validate data and set an error status code, if needed
/// </summary>
protected virtual Task PrepareResponse()
{
return Task.FromResult<object>(null);
response.Headers[HttpResponseHeader.Expires] = DateTime.UtcNow.Add(duration).ToString("r");
}
protected abstract Task WriteResponseToOutputStream(Stream stream);
@@ -380,20 +338,7 @@ namespace MediaBrowser.Common.Net.Handlers
return null;
}
protected virtual Task<DateTime?> GetLastDateModified()
{
DateTime? value = null;
return Task.FromResult(value);
}
private bool IsResponseValid
{
get
{
return StatusCode == 200 || StatusCode == 206;
}
}
protected abstract Task<ResponseInfo> GetResponseInfo();
private Hashtable _formValues;
@@ -455,4 +400,31 @@ namespace MediaBrowser.Common.Net.Handlers
return formVars;
}
}
public class ResponseInfo
{
public string ContentType { get; set; }
public string Etag { get; set; }
public DateTime? DateLastModified { get; set; }
public TimeSpan CacheDuration { get; set; }
public bool CompressResponse { get; set; }
public int StatusCode { get; set; }
public ResponseInfo()
{
CacheDuration = TimeSpan.FromTicks(0);
CompressResponse = true;
StatusCode = 200;
}
public bool IsResponseValid
{
get
{
return StatusCode == 200 || StatusCode == 206;
}
}
}
}