namespace Xmpp { public class StanzaWriter { public signal void cancel(); private OutputStream output; private Queue queue = new Queue(); private bool running = false; public StanzaWriter.for_stream(OutputStream output) { this.output = output; } public async void write_node(StanzaNode node) throws XmlError { yield write_data(node.to_xml().data); } public async void write_nodes(StanzaNode node1, StanzaNode node2) throws XmlError { var data1 = node1.to_xml().data; var data2 = node2.to_xml().data; uint8[] concat = new uint8[data1.length + data2.length]; int i = 0; foreach (var datum in data1) { concat[i++] = datum; } foreach (var datum in data2) { concat[i++] = datum; } yield write_data(concat); } public async void write(string s) throws XmlError { yield write_data(s.data); } private async void write_data(owned uint8[] data) throws XmlError { if (running) { queue.push_tail(new SourceFuncWrapper(write_data.callback)); yield; } running = true; try { yield output.write_all_async(data, 0, null, null); } catch (GLib.Error e) { cancel(); throw new XmlError.IO(@"IOError in GLib: $(e.message)"); } finally { SourceFuncWrapper? sfw = queue.pop_head(); if (sfw != null) { sfw.sfun(); } else { running = false; } } } } public class SourceFuncWrapper : Object { public SourceFunc sfun; public SourceFuncWrapper(owned SourceFunc sfun) { this.sfun = (owned)sfun; } } }