/// <summary>
/// Adds a query string to a <see cref="Uri"/> or replaces the existing query string.
/// </summary>
public static Uri WithQueryString(this Uri instance, QueryString qs)
{
if (instance == null)
throw new ArgumentNullException("instance");
if (qs == null)
throw new ArgumentNullException("qs");
var fragment = instance.GetComponents(UriComponents.Fragment, UriFormat.UriEscaped);
var beforeQs = instance.GetComponents(UriComponents.AbsoluteUri & ~(UriComponents.Fragment | UriComponents.Query), UriFormat.UriEscaped);
return new Uri(beforeQs + qs + fragment, instance.IsAbsoluteUri ? UriKind.Absolute : UriKind.Relative);
}
private string TryDetermineIncomingMessageUrl()
{
if (_incomingSequenceReference == null || _sessionID == null)
return null;
var qs = new QueryString();
qs["sn"] = _incomingSequenceReference.ToString();
qs["sid"] = _sessionID.Value.ToString();
return IncomingRootUrl + qs;
}
/// <summary>
/// Executes a set of commands in a transaction, returning the results of those commands.
/// This function can be called multiple times concurrently - the transactions will be executed sequentially.
/// </summary>
private async Task<JArray> ExecuteCommands(object[] commands, CancellationToken cancellationToken = default(CancellationToken))
{
VerifyNotDisposed();
using (await AcquireLock(cancellationToken))
{
var qs = new QueryString();
qs["id"] = unchecked(_sequenceID++).ToString(CultureInfo.InvariantCulture);
if (_sessionID.HasValue)
qs["sid"] = _sessionID.Value.ToString();
var url = OutgoingRootUrl + qs;
var result = await _outgoingClient.PostAsJsonAsyncCancellationSafe(url, commands, cancellationToken);
// Error codes here are a request-level error equivalent to EAGAIN (-3).
result.EnsureSuccessStatusCode();
// API errors still come to us with 200 OK.
// API errors are sometimes treated as results, e.g. for a two-command transaction, we could get back [-1, -1]
// But SOMETIMES they are not results! We could just get back -3 and that's it. Bit of a pain in the ass...
var responseBody = await result.Content.ReadAsStringAsync();
Debug.WriteLine(responseBody);
var resultObject = JsonConvert.DeserializeObject(responseBody);
JArray results;
if (resultObject is JArray)
results = (JArray)resultObject; // We got a list of result codes.
else if (resultObject is long)
results = new JArray(resultObject); // We got a single result code. Just wrap it in an array for processing.
else
throw new MegaException(responseBody);
// Find any failure in the results and throw if found one.
foreach (var r in results)
ThrowOnFailureResult(r);
return results;
}
}