/// <summary>
/// Attach a callback that performs new asyncronous work when the original promise fails
/// </summary>
public static IPromise <T> FailOver <T>(this IPromise <T> promise, Func <IPromise <T> > callback)
{
var result = new Promise <T>();
result.CancelTarget(
promise
.Progress((p, m) => result.Notify(p / 50, m))
.Done(t => result.Resolve(t))
.Fail(exT =>
{
try
{
result.CancelTarget(
callback()
.Progress((p, m) => result.Notify(50 + p / 50, m))
.Done(s => result.Resolve(s))
.Fail(exS => result.Reject(exS)));
}
catch (Exception ex)
{
result.Reject(ex);
}
}));
return(result);
}
/// <summary>
/// Get a single item from the database using the specified query asynchronously. If the result is not a single item, an exception will be thrown
/// </summary>
/// <param name="conn">Server connection</param>
/// <param name="request">Query/command which should return a single item</param>
/// <param name="async">Whether to perform this request asynchronously</param>
/// <returns>A promise to return a single readonly item</returns>
public static IPromise <IReadOnlyItem> ItemByQuery(this IConnection conn, Command request, bool async)
{
var result = new Promise <IReadOnlyItem>();
result.CancelTarget(conn.ProcessAsync(request, async)
.Progress((p, m) => result.Notify(p, m))
.Done(r =>
{
if (string.IsNullOrEmpty(conn.UserId))
{
result.Reject(new LoggedOutException());
}
else
{
var res = conn.AmlContext.FromXml(r, request, conn);
var ex = res.Exception;
if (ex == null)
{
try
{
result.Resolve(res.AssertItem());
}
catch (Exception exc)
{
result.Reject(exc);
}
}
else
{
result.Reject(ex);
}
}
}).Fail(ex => result.Reject(ex)));
return(result);
}
/// <summary>
/// Convert a .Net 4.0 Task to a promise
/// </summary>
public static IPromise <T> ToPromise <T>(this Task <T> task, CancellationTokenSource cts = null)
{
var result = new Promise <T>();
if (cts != null)
{
result.CancelTarget(new CancelTarget()
{
Source = cts
});
}
task.ContinueWith(t =>
{
if (t.IsFaulted)
{
Exception ex = t.Exception;
if (ex != null && ex.InnerException != null)
{
ex = ex.InnerException;
}
result.Reject(ex);
}
else if (!t.IsCanceled)
{
result.Resolve(t.Result);
}
});
return(result);
}
/// <summary>
/// Convert a promise by modifying the done/fail logic in addition to transforming the type.
/// </summary>
public static IPromise <S> Convert <T, S>(this IPromise <T> promise, Action <T, Promise <S> > doneCallback, Action <Exception, Promise <S> > failCallback)
{
var result = new Promise <S>();
result.CancelTarget(
promise
.Progress((p, m) => result.Notify(p, m))
.Done(d =>
{
doneCallback.Invoke(d, result);
}).Fail(ex => failCallback.Invoke(ex, result)));
return(result);
}
/// <summary>
/// Convert a promise using a simple transformation to go from one type to another
/// </summary>
public static IPromise <S> Convert <T, S>(this IPromise <T> promise, Func <T, S> callback)
{
var result = new Promise <S>();
result.CancelTarget(
promise
.Progress((p, m) => result.Notify(p, m))
.Done(d =>
{
try
{
result.Resolve(callback.Invoke(d));
}
catch (Exception ex)
{
result.Reject(ex);
}
}).Fail(ex => result.Reject(ex)));
return(result);
}
private static IPromise <T> ToHttpPromise <T>(this Task <T> task, TimeoutSource timeout, LogData trace)
{
var result = new Promise <T>();
result.CancelTarget(timeout);
task
.ContinueWith(t =>
{
if (t.IsFaulted)
{
Exception ex = t.Exception;
while (ex != null && ex.InnerException != null && ex.GetType().Name == "AggregateException")
{
ex = ex.InnerException;
}
if (ex != null)
{
foreach (var kvp in trace)
{
ex.Data[kvp.Key] = kvp.Value;
}
trace.Add("exception", ex);
}
result.Reject(ex);
}
else if (t.IsCanceled)
{
result.Reject(new HttpTimeoutException(string.Format("A response was not received after waiting for {0:m' minutes, 's' seconds'}", TimeSpan.FromMilliseconds(timeout.TimeoutDelay))));
}
else
{
result.Resolve(t.Result);
}
});
return(result);
}
private static IPromise <IReadOnlyResult> ApplyAsyncInt(this IAsyncConnection conn, Command query, CancellationToken ct, params object[] parameters)
{
var result = new Promise <IReadOnlyResult>();
query.WithAml(query.Aml, parameters);
ct.Register(() => result.Cancel());
result.CancelTarget(
conn.Process(query, true)
.Progress((p, m) => result.Notify(p, m))
.Done(r =>
{
try
{
if (query.Action == CommandAction.ApplySQL)
{
var res = ElementFactory.Utc.FromXml(r, query, conn);
result.Resolve(res);
}
else
{
var res = conn.AmlContext.FromXml(r, query, conn);
result.Resolve(res);
}
}
catch (Exception ex)
{
result.Reject(ex);
}
}).Fail(ex =>
{
result.Reject(ex);
}));
return(result);
}
/// <summary>
/// Asynchronously gets an HTTP connection to an innovator instance (or proxy) at the given URL
/// </summary>
/// <param name="preferences">Object containing preferences for the connection</param>
/// <param name="async">Whether or not to return the connection asynchronously. This is important
/// as an HTTP request must be issued to determine the type of connection to create</param>
/// <returns>A promise to return a connection object</returns>
public static IPromise <IRemoteConnection> GetConnection(ConnectionPreferences preferences, bool async)
{
preferences = preferences ?? new ConnectionPreferences();
var url = preferences.Url;
url = (url ?? "").TrimEnd('/');
if (url.EndsWith("Server/InnovatorServer.aspx", StringComparison.OrdinalIgnoreCase))
{
url = url.Substring(0, url.Length - 21);
}
if (!url.EndsWith("/server", StringComparison.OrdinalIgnoreCase))
{
url += "/Server";
}
var configUrl = url + "/mapping.xml";
var masterService = preferences.HttpService ?? DefaultService.Invoke();
var arasSerice = preferences.HttpService ?? DefaultService.Invoke();
Func <ServerMapping, IRemoteConnection> connFactory = m =>
{
var uri = (m.Url ?? "").TrimEnd('/');
if (!uri.EndsWith("/server", StringComparison.OrdinalIgnoreCase))
{
url += "/Server";
}
switch (m.Type)
{
case ServerType.Proxy:
throw new NotSupportedException();
default:
return(ArasConn(arasSerice, uri, preferences));
}
};
var result = new Promise <IRemoteConnection>();
var req = new HttpRequest();
req.UserAgent = preferences.Headers.UserAgent;
req.SetHeader("Accept", "text/xml");
foreach (var header in preferences.Headers.NonUserAgentHeaders())
{
req.SetHeader(header.Key, header.Value);
}
var trace = new LogData(4, "Innovator: Try to download mapping file", Factory.LogListener)
{
{ "url", configUrl },
};
result.CancelTarget(masterService.GetPromise(new Uri(configUrl), async, trace, req)
.Progress((p, m) => result.Notify(p, m))
.Done(r =>
{
var data = r.AsString();
if (string.IsNullOrEmpty(data))
{
result.Resolve(ArasConn(arasSerice, url, preferences));
}
else
{
try
{
var servers = ServerMapping.FromXml(data).ToArray();
if (servers.Length < 1)
{
result.Resolve(ArasConn(arasSerice, url, preferences));
}
else if (servers.Length == 1)
{
result.Resolve(connFactory(servers.Single()));
}
else
{
foreach (var server in servers)
{
server.Factory = connFactory;
}
result.Resolve(new MappedConnection(servers, preferences.AuthCallback));
}
}
catch (XmlException)
{
result.Resolve(ArasConn(arasSerice, url, preferences));
}
}
}).Fail(ex =>
{
result.Resolve(ArasConn(arasSerice, url, preferences));
})).Always(trace.Dispose);
if (preferences.Credentials != null)
{
IRemoteConnection conn = null;
return(result
.Continue(c =>
{
conn = c;
return c.Login(preferences.Credentials, async);
})
.Convert(u => conn));
}
return(result);
}
