private static async Task <string> WriteContentAsync(ContentStream stream, IDictionary <string, string[]> headers, long maxLength)
{
const string ContentType = "Content-Type";
var contentType =
headers.ContainsKey(ContentType) ?
headers[ContentType][0] :
null
;
return(await stream.ReadContentAsync(contentType, maxLength));
}
/// <summary>
/// Processes the incoming HTTP call and capture details about
/// the request, the response, the identity of the caller and the
/// call duration to persistent storage.
/// </summary>
/// <param name="context">A reference to the Owin context.</param>
/// <returns />
public override async Task Invoke(IOwinContext context)
{
var request = context.Request;
var response = context.Response;
// capture details about the caller identity
var identity =
request.User != null && request.User.Identity.IsAuthenticated ?
request.User.Identity.Name :
"(anonymous)"
;
var record = new HttpEntry
{
CallerIdentity = identity,
};
string origin = request.Headers.ContainsKey("Origin") ? request.Headers.Get("Origin") : "";
if (!String.IsNullOrEmpty(origin) && !origin.Contains("null"))
{
record.RequestOrigin = origin;
}
else
{
record.RequestOrigin = "*";
}
// replace the request stream in order to intercept downstream reads
var requestBuffer = new MemoryStream();
var requestStream = new ContentStream(requestBuffer, request.Body);
request.Body = requestStream;
// replace the response stream in order to intercept downstream writes
var responseBuffer = new MemoryStream();
var responseStream = new ContentStream(responseBuffer, response.Body);
response.Body = responseStream;
// add the "Http-Tracking-Id" response header
context.Response.OnSendingHeaders(state =>
{
var ctx = state as IOwinContext;
var resp = ctx.Response;
// adding the tracking id response header so that the user
// of the API can correlate the call back to this entry
resp.Headers.Add(trackingIdPropertyName_, new[] { record.TrackingId.ToString("d"), });
resp.Headers.Add(AllowCorsPropertyName_, new[] { record.RequestOrigin, });
}, context)
;
// invoke the next middleware in the pipeline
await Next.Invoke(context);
// rewind the request and response buffers
// and record their content
WriteRequestHeaders(request, record);
record.RequestLength = requestStream.ContentLength;
record.Request = await WriteContentAsync(requestStream, record.RequestHeaders, maxRequestLength_);
WriteResponseHeaders(response, record);
record.ResponseLength = responseStream.ContentLength;
record.Response = await WriteContentAsync(responseStream, record.ResponseHeaders, maxResponseLength_);
// persist details of the call to durable storage
await storage_.InsertRecordAsync(record);
}
private static async Task<string> WriteContentAsync(ContentStream stream, IDictionary<string, string[]> headers, long maxLength)
{
const string ContentType = "Content-Type";
var contentType =
headers.ContainsKey(ContentType) ?
headers[ContentType][0] :
null
;
return await stream.ReadContentAsync(contentType, maxLength);
}
/// <summary>
/// Processes the incoming HTTP call and capture details about
/// the request, the response, the identity of the caller and the
/// call duration to persistent storage.
/// </summary>
/// <param name="context">A reference to the Owin context.</param>
/// <returns />
public override async Task Invoke(IOwinContext context)
{
var request = context.Request;
var response = context.Response;
// capture details about the caller identity
var identity =
request.User != null && request.User.Identity.IsAuthenticated ?
request.User.Identity.Name :
"(anonymous)"
;
var record = new HttpEntry
{
CallerIdentity = identity,
};
string origin = request.Headers.ContainsKey("Origin") ? request.Headers.Get("Origin") : "";
if (!String.IsNullOrEmpty(origin) && !origin.Contains("null"))
record.RequestOrigin = origin;
else
record.RequestOrigin = "*";
// replace the request stream in order to intercept downstream reads
var requestBuffer = new MemoryStream();
var requestStream = new ContentStream(requestBuffer, request.Body);
request.Body = requestStream;
// replace the response stream in order to intercept downstream writes
var responseBuffer = new MemoryStream();
var responseStream = new ContentStream(responseBuffer, response.Body);
response.Body = responseStream;
// add the "Http-Tracking-Id" response header
context.Response.OnSendingHeaders(state =>
{
var ctx = state as IOwinContext;
var resp = ctx.Response;
// adding the tracking id response header so that the user
// of the API can correlate the call back to this entry
resp.Headers.Add(trackingIdPropertyName_, new[] { record.TrackingId.ToString("d"), });
resp.Headers.Add(AllowCorsPropertyName_, new[] { record.RequestOrigin, });
}, context)
;
// invoke the next middleware in the pipeline
await Next.Invoke(context);
// rewind the request and response buffers
// and record their content
WriteRequestHeaders(request, record);
record.RequestLength = requestStream.ContentLength;
record.Request = await WriteContentAsync(requestStream, record.RequestHeaders, maxRequestLength_);
WriteResponseHeaders(response, record);
record.ResponseLength = responseStream.ContentLength;
record.Response = await WriteContentAsync(responseStream, record.ResponseHeaders, maxResponseLength_);
// persist details of the call to durable storage
await storage_.InsertRecordAsync(record);
}
/// <summary>
/// Processes the incoming HTTP call and capture details about
/// the request, the response, the identity of the caller and the
/// call duration to persistent storage.
/// </summary>
/// <param name="context">A reference to the HTTP context.</param>
/// <returns />
public async Task Invoke(HttpContext context)
{
var request = context.Request;
var response = context.Response;
// capture details about the caller identity
var identity =
context.User != null && context.User.Identity.IsAuthenticated ?
context.User.Identity.Name :
"(anonymous)"
;
var record = new HttpEntry
{
CallerIdentity = identity,
};
// replace the request stream in order to intercept downstream reads
var requestBuffer = new MemoryStream();
var requestStream = new ContentStream(requestBuffer, request.Body)
{
MaxRecordedLength = maxRequestLength_,
};
request.Body = requestStream;
// replace the response stream in order to intercept downstream writes
var responseBuffer = new MemoryStream();
var responseStream = new ContentStream(responseBuffer, response.Body)
{
MaxRecordedLength = maxResponseLength_,
};
response.Body = responseStream;
// add the "Http-Tracking-Id" response header
context.Response.OnStarting(OnSendingHeaders, (response, record));
// invoke the next middleware in the pipeline
await next_.Invoke(context);
// rewind the request and response buffers
// and record their content
WriteRequestHeaders(context, record);
record.RequestLength = requestStream.ContentLength;
record.Request = await WriteContentAsync(requestStream, record.RequestHeaders, maxRequestLength_);
WriteResponseHeaders(response, record);
record.ResponseLength = responseStream.ContentLength;
record.Response = await WriteContentAsync(responseStream, record.ResponseHeaders, maxResponseLength_);
// persist details of the call to durable storage
await storage_.InsertRecordAsync(record);
}
