// This method is the callback for an HTTP request that returns a string (non-json)
private static void ProcessVersionString(IAsyncResult result)
{
WebServiceState state = result.AsyncState as WebServiceState;
if (state == null)
{
TraceLog.TraceError("Web Service State not found");
return;
}
// get the network operation status delegate
Delegate netOpInProgressDel = state.NetworkOperationInProgressDelegate as Delegate;
// get the web response and make sure it's not null (failed)
HttpWebResponse resp = GetWebResponse(result);
if (resp == null)
{
TraceLog.TraceError("GetWebResponse failed");
// signal that the network operation completed unsuccessfully
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
// get the method-specific delegate
Delegate del = state.Delegate as Delegate;
if (del == null)
{
return; // if no delegate was passed, the results can't be processed
}
// write the result of the GET to a temp file
string version = null;
using (var inputStream = resp.GetResponseStream())
using (var reader = new StreamReader(inputStream))
{
version = reader.ReadToEnd();
}
// invoke the delegate with the version
try
{
del.DynamicInvoke(version);
}
catch (Exception ex)
{
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
TraceLog.TraceException("ProcessVersionString: exception from DynamicInvoke", ex);
}
}
private static HttpWebResponse GetWebResponse(IAsyncResult result)
{
WebServiceState state = result.AsyncState as WebServiceState;
if (state == null)
{
TraceLog.TraceError("Web Service State not found");
return(null);
}
var request = state.Request;
if (request == null)
{
TraceLog.TraceError("Web Service Request not found");
return(null);
}
HttpWebResponse resp = null;
// get response and mark request as not in progress
try
{
resp = (HttpWebResponse)request.EndGetResponse(result);
if (resp == null)
{
return(null);
}
}
catch (Exception ex)
{
TraceLog.TraceException("GetWebResponse: EndGetResponse failed", ex);
return(resp);
}
// put auth cookie in static memory
if (resp.Headers[authResponseHeader] != null)
{
authCookie = resp.Headers[authResponseHeader];
}
return(resp);
}
private static void GetVersionLoop()
{
while (loopFlag)
{
// sleep for timeout
Thread.Sleep(timeout);
// don't want two concurrent updates
if (checkingFlag || updatingFlag)
{
continue;
}
try
{
// locking is overkill here because only one thread that wakes up every <timeout>
checkingFlag = true;
WebServiceHelper.GetCurrentSoftwareVersion(
VersionUrl,
new WebServiceHelper.AccountDelegate((version) =>
{
if (string.IsNullOrEmpty(version))
{
TraceLog.TraceError("Could not download version file");
checkingFlag = false;
return;
}
try
{
// compare versions
var newVersion = new Version(version);
if (newVersion > CurrentVersion)
{
TraceLog.TraceInfo(string.Format(
"New version {0} more recent than current version {1}; downloading new version",
newVersion, CurrentVersion));
updatingFlag = true;
// download and install new software
WebServiceHelper.DownloadCurrentSoftware(
DownloadUrl,
new WebServiceHelper.AccountDelegate((filename) =>
{
// install the new software
TraceLog.TraceInfo(string.Format("Download successful; installing {0}", filename));
Install(filename);
}),
new WebServiceHelper.NetOpDelegate((inProgress, status) =>
{
// cleanup the checking flag based on network operation status (typically failures)
if (inProgress == false)
{
updatingFlag = false;
}
}));
}
checkingFlag = false;
}
catch (Exception ex)
{
TraceLog.TraceException("Version check failed", ex);
checkingFlag = false;
updatingFlag = false;
}
}),
new WebServiceHelper.NetOpDelegate((inProgress, status) =>
{
// cleanup the checking flag based on network operation status (typically failures)
if (inProgress == false)
{
checkingFlag = false;
}
}));
}
catch (Exception ex)
{
TraceLog.TraceException("GetVersionLoop failed", ex);
checkingFlag = false;
updatingFlag = false;
}
}
}
// Common code to process the response from any web service call. This is invoked from the callback
// method for the web service, and passed a Type for deserializing the response body.
// This method will also invoke the delegate with the result of the Web Service call
private static void ProcessResponse <T>(IAsyncResult result)
{
WebServiceState state = result.AsyncState as WebServiceState;
if (state == null)
{
TraceLog.TraceError("Web Service State not found");
return;
}
// get the network operation status delegate
Delegate netOpInProgressDel = state.NetworkOperationInProgressDelegate as Delegate;
// get the web response and make sure it's not null (failed)
//HttpWebResponseWrapper<T> resp = GetWebResponse<T>(result);
HttpWebResponse resp = GetWebResponse(result);
if (resp == null)
{
TraceLog.TraceError("GetWebResponse failed");
// signal that the network operation completed unsuccessfully
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
else
{
OperationStatus status = AsOperationStatus(resp.StatusCode);
if (resp.StatusCode == HttpStatusCode.Unauthorized)
{ // using this status code to indicate cookie has expired or is invalid
if (authCookie != null)
{ // remove cookie and retry with credentials
status = OperationStatus.Retry;
authCookie = null;
}
}
if (resp.StatusCode == HttpStatusCode.Forbidden)
{ // remove cookie and force authentication on next request
authCookie = null;
}
if (netOpInProgressDel != null)
{ // signal the network operation completed and whether it completed successfully
netOpInProgressDel.DynamicInvoke(false, status);
if (status == OperationStatus.Retry)
{ // delegate will retry, exit now
TraceLog.TraceInfo("Received a Retry response from Service");
return;
}
}
}
// get the method-specific delegate
Delegate del = state.Delegate as Delegate;
//if (del == null)
// return; // if no delegate was passed, the results can't be processed
// invoke the delegate with the response body
try
{
T resultObject = (T) new DataContractJsonSerializer(typeof(T)).ReadObject(resp.GetResponseStream());
//T resultObject = resp.GetBody();
if (del == null)
{
return; // if no delegate was passed, the results can't be processed
}
del.DynamicInvoke(resultObject);
}
catch (Exception ex)
{
TraceLog.TraceException("ProcessResponse: exception from GetBody or DynamicInvoke", ex);
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
if (del == null)
{
return; // if no delegate was passed, the results can't be processed
}
del.DynamicInvoke(null);
}
}
// This method is the callback for an HTTP request that returns a file. It will save the
// file to a temporary location and invoke the delegate with the location.
private static void ProcessFile(IAsyncResult result)
{
const string updateDir = @"updates";
const string msiname = @"WebTimer.msi";
WebServiceState state = result.AsyncState as WebServiceState;
if (state == null)
{
TraceLog.TraceError("Web Service State not found");
return;
}
// get the network operation status delegate
Delegate netOpInProgressDel = state.NetworkOperationInProgressDelegate as Delegate;
// get the web response and make sure it's not null (failed)
HttpWebResponse resp = GetWebResponse(result);
if (resp == null)
{
TraceLog.TraceError("GetWebResponse failed");
// signal that the network operation completed unsuccessfully
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
// get the method-specific delegate
Delegate del = state.Delegate as Delegate;
if (del == null)
{
return; // if no delegate was passed, the results can't be processed
}
try
{
// create directory if it doesn't exist
if (!Directory.Exists(updateDir))
{
Directory.CreateDirectory(updateDir);
}
}
catch (Exception ex)
{
TraceLog.TraceException("Could not create updates directory", ex);
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
// can't process further
return;
}
// write the result of the GET to a temp file
//string updatepath = Path.GetRandomFileName();
var now = DateTime.Now;
string updatepath = Path.Combine(updateDir, string.Format("update-{0}", now.ToString("yyyy-MM-dd-HH-mm-ss")));
string updatefile = Path.Combine(updatepath, msiname);
try
{
TraceLog.TraceInfo(string.Format("Creating update directory {0}", updatepath));
Directory.CreateDirectory(updatepath);
TraceLog.TraceInfo(string.Format("Saving MSI in {0}", updatefile));
using (var inputStream = resp.GetResponseStream())
using (var fileStream = File.OpenWrite(updatefile))
{
byte[] buffer = new byte[8 * 1024];
int len;
while ((len = inputStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, len);
}
}
}
catch (Exception ex)
{
TraceLog.TraceException(string.Format("Could not create temporary file {0}", updatefile), ex);
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
// invoke the delegate with the temp file name
try
{
del.DynamicInvoke(updatefile);
}
catch (Exception ex)
{
TraceLog.TraceException("ProcessFile: exception from DynamicInvoke", ex);
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
}
}
private static void InvokeWebServiceRequest_Inner(IAsyncResult res)
{
WebInvokeServiceState state = res.AsyncState as WebInvokeServiceState;
if (state == null)
{
TraceLog.TraceError("Web Service State not found");
return;
}
var request = state.Request;
var netOpInProgressDel = state.NetworkOperationInProgressDelegate as Delegate;
if (request == null)
{
TraceLog.TraceError("Web Service Request not found");
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
Stream stream = null;
try
{
// this will throw if the connection can't be established
stream = request.EndGetRequestStream(res);
}
catch (Exception ex)
{
TraceLog.TraceException("Can't obtain stream", ex);
// signal the operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
return;
}
// serialize a request body if one was passed in (and the verb will take it)
if (state.RequestBody != null && request.Method != "GET")
{
// a null request body means that the caller wants to get the stream back and write to it directly
if (state.RequestBody as Delegate != null)
{
Delegate streamDel = (Delegate)state.RequestBody;
// invoke the delegate passed in with the request stream, so that the external caller
// can push data into the stream as it becomes available
streamDel.DynamicInvoke(stream);
}
else
{
// the caller passed the complete object - so just serialize it onto the stream
if (state.RequestBody.GetType() == typeof(byte[]))
{
/*
* byte[] bytes = (byte[])state.RequestBody;
#if !IOS
* stream = new GZipStream(stream, CompressionMode.Compress);
* request.ContentType = "application/x-gzip";
#else
* stream = new MemoryStream();
* request.ContentType = "application/octet-stream";
#endif
* stream.Write(bytes, 0, bytes.Length);
*/
}
else
{
request.ContentType = "application/json";
DataContractJsonSerializer ser = new DataContractJsonSerializer(state.RequestBody.GetType());
ser.WriteObject(stream, state.RequestBody);
}
// we got all the data into the stream, so flush/close it
stream.Flush();
stream.Close();
}
}
// complete the invocation (this is not done inline because the InvokeWebServiceRequest_Inner_Complete() method
// is reused by external callers that want to write to a stream directly and then invoke the operation)
InvokeWebServiceRequest_Invoke(request, state.Delegate, state.NetworkOperationInProgressDelegate, state.Callback);
}
// Common code for invoking all the web service calls.
// GET requests will be served directly from this method,
// POST/PUT/DELETE requests are served from the InvokeWebServiceRequest_Inner method (which is an async callback)
private static void InvokeWebServiceRequest(string userCreds, string url, string verb, object obj, Delegate del, Delegate netOpInProgressDel, AsyncCallback callback)
{
// signal that a network operation is starting
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(true, OperationStatus.Started);
}
Uri uri = null;
if (Uri.TryCreate(url, UriKind.RelativeOrAbsolute, out uri) == false ||
uri.Scheme != "http" && uri.Scheme != "https")
{
TraceLog.TraceError("InvokeWebServiceRequest: bad URL: " + url);
return;
}
var request = (HttpWebRequest)WebRequest.Create(uri);
request.UserAgent = UserAgentString;
request.Accept = "application/json";
request.Method = verb == null ? "GET" : verb;
if (authCookie != null)
{ // send auth cookie
request.Headers[authRequestHeader] = authCookie;
}
else if (userCreds != null)
{ // send credentials in authorization header
// url form encoded
//string credentials = string.Format("UserName={0}&Password={1}", user.UserName, user.Password);
// basic auth encoded
request.Headers[authorizationHeader] = string.Format("Basic {0}", userCreds);
request.Headers[HttpApplicationHeaders.RequestedWith] = UserAgents.WebTimerWindows;
}
// set the session ID header
var sessionToken = TraceLog.Session;
if (sessionToken != null)
{
request.Headers[HttpApplicationHeaders.Session] = sessionToken;
}
// if this is a GET request, we can execute from here
if (request.Method == "GET")
{
// execute the web request and get the response
try
{
WebServiceState reqState = new WebServiceState()
{
Request = request,
Delegate = del,
NetworkOperationInProgressDelegate = netOpInProgressDel
};
request.BeginGetResponse(callback, reqState);
}
catch (Exception ex)
{
TraceLog.TraceException("Exception in BeginGetResponse", ex);
// signal that a network operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
}
}
else
{
// this is a request that contains a body (PUT, POST, DELETE)
// need to nest another async call - this time to get the request stream
try
{
request.BeginGetRequestStream(
new AsyncCallback(InvokeWebServiceRequest_Inner),
new WebInvokeServiceState()
{
Request = request,
Callback = callback,
Delegate = del,
NetworkOperationInProgressDelegate = netOpInProgressDel,
RequestBody = obj
});
}
catch (Exception ex)
{
// trace the exception
TraceLog.TraceException("Exception in BeginGetResponse", ex);
// signal that a network operation is done and unsuccessful
if (netOpInProgressDel != null)
{
netOpInProgressDel.DynamicInvoke(false, OperationStatus.Failed);
}
}
}
}
