private async Task <WebClientResult> RetryableRequest(Func <Task <string> > makeRequest, int retryCount)
{
var webClientResult = new WebClientResult();
for (var attempt = 0; attempt < retryCount; attempt++)
{
try
{
if (attempt > 0)
{
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine("retrying...");
}
webClientResult.Content = await makeRequest();
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine("Complete");
webClientResult.Success = true;
return(webClientResult);
}
catch (WebException e)
{
var responseStream = e.Response?.GetResponseStream();
if (responseStream != null)
{
using (var resp = new StreamReader(responseStream))
{
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine(resp.ReadToEnd());
_logger.LogError(webClientResult.DebugInfo);
}
}
else
{
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine($"{e.Message}");
_logger.LogError(webClientResult.DebugInfo);
}
}
catch (Exception e)
{
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine($"{e.Message}");
_logger.LogError(webClientResult.DebugInfo);
}
await Task.Delay(1000);
}
webClientResult.DebugInfo
= webClientResult.DebugInfo.AppendLine("Failed");
_logger.LogError(webClientResult.DebugInfo);
return(webClientResult);
}
public void Intercept(IInvocation invocation)
{
var webAttribs = from s in
(from a in invocation.Method.GetCustomAttributes(false).ToArray() select a)
where s is WebInvokeAttribute || s is WebGetAttribute
select s;
if (webAttribs.Count() != 1)
throw new Exception("ServiceModel.Web attributes not found on method");
var attrib = webAttribs.Single();
var uriTemplate = new UriTemplate("");
string httpMethod = "GET";
if (attrib is WebGetAttribute)
{
uriTemplate = new UriTemplate(((WebGetAttribute)attrib).UriTemplate);
httpMethod = "GET";
}
else if (attrib is WebInvokeAttribute)
{
uriTemplate = new UriTemplate(((WebInvokeAttribute)attrib).UriTemplate);
httpMethod = "POST";
}
var uriParams = new Dictionary<string, string>();
ParameterInfo[] Params = invocation.Method.GetParameters();
object[] args = invocation.Arguments;
for (int i = 0; i < invocation.Arguments.Count(); i++)
{
string sValue = TypeUtils.StringOrNull(args[i]);
if (!string.IsNullOrEmpty(sValue)) uriParams.Add(Params[i].Name, sValue);
}
var combinedUriParams = _baseParams.Union(uriParams).ToDictionary(p => p.Key, p => p.Value);
Uri uriLoc = uriTemplate.BindByName(_uriBase, combinedUriParams, false);
//swReflection.Stop();
Log.Trace(uriLoc.ToString());
var swSetup = new Stopwatch();
swSetup.Start();
_webRequest = (HttpWebRequest)WebRequest.Create(uriLoc);
// Add OAuth authorization header
if (_oAuthParams != null)
{
var oAuthUtils = new OAuthUtils();
string authHeader = (oAuthUtils.GetAuthorizationHeader(
System.Web.HttpUtility.UrlDecode(uriLoc.AbsoluteUri), _oAuthParams.Realm, _oAuthParams.ConsumerKey, _oAuthParams.ConsumerSecret,
_oAuthParams.UserToken, _oAuthParams.UserSecret, null, SignatureMethod.HMACSHA1, httpMethod)).ToString();
_webRequest.Headers[HttpRequestHeader.Authorization] = authHeader;
}
Log.Trace(_webRequest.Headers.ToString());
//TODO replace with app settings
_webRequest.UserAgent = "Toketee 0.1";
_webRequest.Timeout = _timeout;
_webRequest.KeepAlive = false;
_webRequest.Method = httpMethod;
swSetup.Stop();
//TODO implement connection manager
var swRequest = new Stopwatch();
swRequest.Start();
try
{
_webResponse = (HttpWebResponse)_webRequest.GetResponse();
}
catch (WebException we)
{
switch (we.Status)
{
case WebExceptionStatus.Timeout:
// retry operation, see if endpoint is available or if there's another problem
break;
}
_webResponse = (HttpWebResponse)we.Response;
}
finally
{
}
swRequest.Stop();
Encoding encode = System.Text.Encoding.UTF8;
if (_webResponse != null)
{
var responseStream = new StreamReader(_webResponse.GetResponseStream(), encode);
string sResponse = responseStream.ReadToEnd();
LogJson.Trace(new JsonFormatter(sResponse).Format());
// TODO add exception trapping
var result = new WebClientResult(_webResponse, sResponse, true, null);
// TODO move to an error handling method
// This is twitter specific, need to move over to TwitterAPI
switch (Utility.Parse.GetValueFromJson(sResponse, "error"))
{
case "Incorrect signature":
throw new OAuthIncorrectSignatureException(sResponse);
}
invocation.ReturnValue = result;
}
else
{
invocation.ReturnValue = null;
}
}
public void Intercept(IInvocation invocation)
{
var webAttribs = from s in
(from a in invocation.Method.GetCustomAttributes(false).ToArray() select a)
where s is WebInvokeAttribute || s is WebGetAttribute
select s;
if (webAttribs.Count() != 1)
throw new Exception("ServiceModel.Web attributes not found on method");
var attrib = webAttribs.Single();
UriTemplate uriTemplate = new UriTemplate("");
string httpMethod = "GET";
if (attrib is WebGetAttribute)
{
uriTemplate = new UriTemplate(((WebGetAttribute)attrib).UriTemplate);
httpMethod = "GET";
}
else if (attrib is WebInvokeAttribute)
{
uriTemplate = new UriTemplate(((WebInvokeAttribute)attrib).UriTemplate);
httpMethod = "POST";
}
Dictionary<string, string> uriParams = new Dictionary<string, string>();
ParameterInfo[] Params = invocation.Method.GetParameters();
object[] Args = invocation.Arguments;
string sValue;
for (int i = 0; i < invocation.Arguments.Count(); i++)
{
sValue = TypeUtils.StringOrNull(Args[i]);
if (!string.IsNullOrEmpty(sValue)) uriParams.Add(Params[i].Name, sValue);
}
Uri uri = uriTemplate.BindByName(new Uri("http://api.twitter.com"), uriParams, false);
//swReflection.Stop();
logger.Trace(uri.ToString());
Stopwatch swSetup = new Stopwatch();
swSetup.Start();
webRequest = (HttpWebRequest)WebRequest.Create(uri);
// Add OAuth authorization header
if (OAuthParams != null)
{
OAuthUtils oAuthUtils = new OAuthUtils();
string authHeader = (oAuthUtils.GetAuthorizationHeader(
System.Web.HttpUtility.UrlDecode(uri.AbsoluteUri), OAuthParams.Realm, OAuthParams.ConsumerKey, OAuthParams.ConsumerSecret,
OAuthParams.UserToken, OAuthParams.UserSecret, null, SignatureMethod.HMACSHA1, httpMethod)).ToString();
webRequest.Headers[HttpRequestHeader.Authorization] = authHeader;
}
logger.Trace(webRequest.Headers.ToString());
webRequest.UserAgent = "Toketee 0.1";
webRequest.Timeout = Timeout;
webRequest.KeepAlive = false;
webRequest.Method = httpMethod;
swSetup.Stop();
//TODO implement connection manager
//webRequest.ServicePoint
var swRequest = new Stopwatch();
swRequest.Start();
try
{
webResponse = (HttpWebResponse)webRequest.GetResponse();
}
catch (WebException we)
{
switch (we.Status)
{
case WebExceptionStatus.Timeout:
// retry operation, see if endpoint is available or if there's another problem
break;
}
webResponse = (HttpWebResponse)we.Response;
}
finally
{
}
swRequest.Stop();
Encoding encode = System.Text.Encoding.UTF8;
var responseStream = new StreamReader(webResponse.GetResponseStream(), encode);
string sResponse = responseStream.ReadToEnd();
logJson.Trace(new JsonFormatter(sResponse).Format());
// TODO add exception trapping
var result = new WebClientResult(webResponse, sResponse, true, null);
// TODO move to an error handling method
// Look for known Twitter return errors
var jObject = new JObject(sResponse);
switch (jObject["error"].ToString())
{
case "Incorrect signature":
throw new TwitterOAuthIncorrectSignatureException(sResponse);
}
invocation.ReturnValue = result;
}
