public static bool DeserializeHeaders(MessageQueryModel message, out Dictionary <string, string> dictionary)
{
try
{
var headersAsJsonString = Encoding.UTF7.GetString(message.Headers);
var headers = JsonConvert.DeserializeObject <Dictionary <string, string> >(headersAsJsonString);
dictionary = headers;
return(true);
}
catch
{
dictionary = null;
return(false);
}
}
public static MessageViewModel ParseMessage(MessageQueryModel message)
{
try
{
var couldDeserializeHeaders = DeserializeHeaders(message, out var headers);
if (!couldDeserializeHeaders)
{
return(null);
}
var couldDecodeBody = TryDecodeBody(message, headers, out var body);
if (!couldDecodeBody)
{
return(null);
}
//remove ErrorDetails from headers as we assign this to its own property
var headerViewModels = headers
.Where(x => x.Key != Headers.ErrorDetails)
.Select(item => new MessageHeaderViewModel(item.Key, item.Value))
.ToList();
var sentTimeString = headers[Headers.SentTime];
sentTimeString = sentTimeString.Substring(0, sentTimeString.LastIndexOf(':'));
DateTimeOffset.TryParse(sentTimeString, out var sentTime);
headers.TryGetValue(Headers.ErrorDetails, out var errors);
headers.TryGetValue(Headers.SourceQueue, out var sourceQueue);
return(new MessageViewModel(
message.Id,
headerViewModels,
headers[Headers.Type],
sourceQueue,
sentTime,
message.Visible,
message.Expiration,
body,
errors));
}
catch (Exception e)
{
return(null);
}
}
private static bool TryDecodeBody(MessageQueryModel message, Dictionary <string, string> headers, out string body)
{
try
{
if (headers == null)
{
body = "Message has no headers that can be understood by Rebus";
return(false);
}
if (!headers.ContainsKey(Headers.ContentType))
{
body = string.Format("Message headers don't contain an element with the '{0}' key", Headers.ContentType);
return(false);
}
var destination = new MemoryStream(message.Body);
var bytes = destination.ToArray();
var bodyIsGzipped = headers.ContainsKey(Headers.ContentEncoding) &&
string.Equals(headers[Headers.ContentEncoding], "gzip", StringComparison.InvariantCultureIgnoreCase);
if (bodyIsGzipped)
{
bytes = new Zipper().Unzip(bytes);
}
var encoding = headers[Headers.ContentType];
var encoder = GetEncoding(encoding);
var str = encoder.GetString(bytes);
body = FormatJson(str);
return(true);
}
catch (Exception e)
{
body = string.Format("An error occurred while decoding the body: {0}", e);
return(false);
}
}
