/// <summary>
/// Checks for unpleasant HTTP status codes as well as other problems with the response.
/// All errors found here are fatal: they break the chain of async processes.
/// </summary>
/// <param name="content">HttpContent for Posting to TNT</param>
/// <param name="expectXml">Do we expect the response to be XML?</param>
private async Task <PostResults> PostAsync(HttpContent content, bool expectXml)
{
HttpResponseMessage resp = null;
try
{
resp = await client.PostAsync(new Uri(TARGET_URL), content);
}
catch (Exception e)
{
FirePostError(0, "PostAsync Exception: " + e.Message);
throw e; //just to stop the flow
}
if (!resp.IsSuccessStatusCode)
{
FirePostError(0, "HTTP error status " + resp.StatusCode + ": " + resp.ReasonPhrase);
throw new InvalidOperationException("HTTP error status " + resp.StatusCode + ": " + resp.ReasonPhrase);
}
//xml checks
if (expectXml)
{
MyXMLDocument xdoc = null;
Stream st = await resp.Content.ReadAsStreamAsync();
try
{
TextReader rd = new StreamReader(st, new UTF8Encoding(false, true));
XmlReader XReader = XmlReader.Create(rd);
xdoc = new MyXMLDocument(XReader, readOnly: true);
if (
xdoc.NodeExists("/runtime_error") ||
xdoc.NodeExists("/parse_error")
)
{
string errormsg = xdoc.GetStringValue("//error_reason/text()");
FirePostError(0, "Errormessage sent by TNT: " + errormsg);
throw new InvalidOperationException("Errormessage sent by TNT: " + errormsg);
}
}
catch (Exception e)
{
FirePostError(0, "Problem parsing xml " + e.Message);
throw e;
}
return(new PostResults(null, xdoc));
}
else
{
string c = await resp.Content.ReadAsStringAsync();
return(new PostResults(c, null));
}
}
/// <summary>
/// Make the Consignments enumerable according to the CREATE section of the doc.
/// Then index the Consignments for each of the relevant sections.
/// Assumption: The CREATE section exists, or we have no Consignments.
/// </summary>
private bool Initialize(IndexBy indexBy)
{
IdPropertyXPath = XPathExpression.Compile("./" + indexBy.ToString() + "/text()");
//determine available sections
hasCreate = doc.NodeExists("/document/CREATE");
hasBook = doc.NodeExists("/document/BOOK");
hasShip = doc.NodeExists("/document/SHIP");
hasPrint = doc.NodeExists("/document/PRINT");
hasError = doc.NodeExists("//ERROR");
hasRuntimeError = doc.NodeExists("/runtime_error");
//prepare iterator and indexes
if (doc.NodeExists("/document"))
{
if (hasCreate)
{
createEnum = doc.GetChildEnumerable(XPathExpression.Compile("/document"), "CREATE");
createIndex = doc.GetChildIndex(XPathExpression.Compile("/document"), "CREATE", IdPropertyXPath);
}
if (hasBook)
{
bookIndex = doc.GetChildIndex(XPathExpression.Compile("/document/BOOK"), "CONSIGNMENT", IdPropertyXPath);
}
if (hasShip)
{
shipIndex = doc.GetChildIndex(XPathExpression.Compile("/document/SHIP"), "CONSIGNMENT", IdPropertyXPath);
}
//...etc
return(true);
}
else
{
return(false); //after all, not worthy of further investigation.
}
}