/// <summary>
/// Processes the response and sends it off to the caller.
/// </summary>
/// <param name="asyncResult">The async result.</param>
private void ResponseCallback(IAsyncResult asyncResult)
{
SendPostEventArgs args = (SendPostEventArgs)asyncResult.AsyncState;
try
{
args.WebResponse = args.WebRequest.EndGetResponse(asyncResult);
}
catch (Exception e)
{
InvokeResponseCallback(args, e.ToString());
return;
}
Stream responseStream = args.WebResponse.GetResponseStream();
using (StreamReader reader = new StreamReader(responseStream))
{
args.ResponseData = reader.ReadToEnd();
}
if (RequestResponseLogEnabled)
{
_requestResponseLog.Add(args.ResponseData);
}
InvokeResponseCallback(args, null);
}
/// <summary>
/// Handles the callback after sending a request.
/// </summary>
/// <param name="sender">The sender of the notification.</param>
/// <param name="args">The event args.</param>
private void SendRequestCallback(object sender, SendPostEventArgs args)
{
if (args.ErrorText != null)
{
string errorText = "Error in talking to HealthVault: " + args.ErrorText;
InvokeApplicationResponseCallback(args.HealthVaultRequest, null, null, errorText);
return;
}
HealthVaultResponse response = null;
try
{
response = new HealthVaultResponse(args.ResponseData);
}
catch (InvalidOperationException)
{
string errorText = "Response was not a valid HealthVault response: " + args.ResponseData;
InvokeApplicationResponseCallback(args.HealthVaultRequest, null, null, errorText);
return;
}
// The token that is returned from GetAuthenticatedSessionToken has a limited lifetime. When it expires,
// we will get an error here. We detect that situation, get a new token, and then re-issue the call.
if (response.StatusCode == AuthenticatedSessionTokenExpired)
{
RefreshSessionToken(args);
return;
}
InvokeApplicationResponseCallback(args.HealthVaultRequest, args.ResponseData, response, response.ErrorMessage);
}
/// <summary>
/// Refresh the session token.
/// </summary>
/// <remarks>Makes a CAST call to get a new session token,
/// and then re-issues the original request.</remarks>
/// <param name="args">The request information.</param>
private void RefreshSessionToken(SendPostEventArgs args)
{
AuthorizationSessionToken = null;
XElement info = CreateCastCallInfoSection();
HealthVaultRequest request = HealthVaultRequest.Create("CreateAuthenticatedSessionToken", "2", info, RefreshSessionTokenCompleted);
request.UserState = args;
BeginSendRequest(request);
}
/// <summary>
/// Call the user's callback handler.
/// </summary>
/// <param name="args">The arguments to pass.</param>
/// <param name="errorText">The error text.</param>
private void InvokeResponseCallback(
SendPostEventArgs args,
string errorText)
{
args.ErrorText = errorText;
if (args.ResponseCallback != null)
{
args.ResponseCallback(this, args);
}
}
/// <summary>
/// Sends the request post data.
/// </summary>
/// <param name="asyncResult">The async result.</param>
private void GetRequestStreamCallback(IAsyncResult asyncResult)
{
SendPostEventArgs args = (SendPostEventArgs)asyncResult.AsyncState;
using (Stream postStream = args.WebRequest.EndGetRequestStream(asyncResult))
{
byte[] bytes = Encoding.UTF8.GetBytes(args.RequestData);
postStream.Write(bytes, 0, bytes.Length);
}
args.WebRequest.BeginGetResponse(ResponseCallback, args);
}
/// <summary>
/// Processes the CAST information and re-issues the original request.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The event args.</param>
private void RefreshSessionTokenCompleted(object sender, HealthVaultResponseEventArgs e)
{
SendPostEventArgs args = (SendPostEventArgs)e.Request.UserState;
// any error just gets returned to the application.
if (e.ErrorText != null)
{
InvokeApplicationResponseCallback(args.HealthVaultRequest, args.ResponseData, e.Response, e.Response.ErrorMessage);
return;
}
// if the CAST was successful the results were saved and
// the original request is restarted.
SaveCastCallResults(e.ResponseXml);
BeginSendRequest(args.HealthVaultRequest);
}
/// <summary>
/// Begin to send a post request to a specific url.
/// </summary>
/// <param name="url">The target url.</param>
/// <param name="requestData">The data to post to the url.</param>
/// <param name="responseCallback">The completion routine.</param>
/// <param name="userRequest">User parameter.</param>
public virtual void BeginSendPostRequest(
string url,
string requestData,
EventHandler <SendPostEventArgs> responseCallback,
HealthVaultRequest userRequest)
{
if (RequestResponseLogEnabled)
{
_requestResponseLog.Add(requestData);
}
SendPostEventArgs args = new SendPostEventArgs();
args.RequestData = requestData;
args.HealthVaultRequest = userRequest;
args.ResponseCallback = responseCallback;
if (userRequest.WebRequest == null)
{
args.WebRequest = WebRequest.Create(url);
args.WebRequest.Method = "POST";
}
else
{
// Mock case...
args.WebRequest = userRequest.WebRequest;
}
try
{
IAsyncResult result = args.WebRequest.BeginGetRequestStream(GetRequestStreamCallback, args);
}
catch (Exception e)
{
InvokeResponseCallback(args, e.ToString());
return;
}
}
/// <summary>
/// Begin to send a post request to a specific url.
/// </summary>
/// <param name="url">The target url.</param>
/// <param name="requestData">The data to post to the url.</param>
/// <param name="responseCallback">The completion routine.</param>
/// <param name="userRequest">User parameter.</param>
public virtual void BeginSendPostRequest(
string url,
string requestData,
EventHandler<SendPostEventArgs> responseCallback,
HealthVaultRequest userRequest)
{
if (RequestResponseLogEnabled)
{
_requestResponseLog.Add(requestData);
}
SendPostEventArgs args = new SendPostEventArgs();
args.RequestData = requestData;
args.HealthVaultRequest = userRequest;
args.ResponseCallback = responseCallback;
if (userRequest.WebRequest == null)
{
args.WebRequest = WebRequest.Create(url);
args.WebRequest.Method = "POST";
}
else
{
// Mock case...
args.WebRequest = userRequest.WebRequest;
}
try
{
IAsyncResult result = args.WebRequest.BeginGetRequestStream(GetRequestStreamCallback, args);
}
catch (Exception e)
{
InvokeResponseCallback(args, e.ToString());
return;
}
}
/// <summary>
/// Call the user's callback handler.
/// </summary>
/// <param name="args">The arguments to pass.</param>
/// <param name="errorText">The error text.</param>
private void InvokeResponseCallback(
SendPostEventArgs args,
string errorText)
{
args.ErrorText = errorText;
if (args.ResponseCallback != null)
{
args.ResponseCallback(this, args);
}
}