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using Gee;
namespace Xmpp.Xep.StreamManagement {
public const string NS_URI = "urn:xmpp:sm:3";
public class Module : XmppStreamNegotiationModule, WriteNodeFunc {
public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, "0198_stream_management");
public int h_inbound = 0;
public int h_outbound = 0;
public string? session_id { get; set; default=null; }
public Gee.List<XmppStreamFlag> flags = null;
private HashMap<int, QueueItem> in_flight_stanzas = new HashMap<int, QueueItem>();
private Gee.List<QueueItem> node_queue = new ArrayList<QueueItem>();
private class QueueItem {
public StanzaNode node;
public Promise<IOError?> promise;
public QueueItem(StanzaNode node, Promise<IOError?> promise) {
this.node = node;
this.promise = promise;
}
}
public async void write_stanza(XmppStream stream, StanzaNode node) throws IOStreamError {
var promise = new Promise<IOError?>();
node_queue.add(new QueueItem(node, promise));
check_queue(stream);
try {
yield promise.future.wait_async();
} catch (FutureError e) {
throw new IOStreamError.WRITE("Future returned error %i".printf(e.code));
}
}
internal async void write_node(XmppStream stream, StanzaNode node) {
StanzaWriter? writer = ((IoXmppStream)stream).writer;
if (writer == null) return;
try {
stream.log.node("OUT", node, stream);
if (node.name == "message" || node.name == "iq" || node.name == "presence") {
var r_node = new StanzaNode.build("r", NS_URI).add_self_xmlns();
stream.log.node("OUT", r_node, stream);
yield ((!)writer).write_nodes(node, r_node);
} else {
yield ((!)writer).write_node(node);
}
} catch (XmlError e) { }
}
private void check_queue(XmppStream stream) {
while (!node_queue.is_empty && in_flight_stanzas.size < 10) {
QueueItem queue_item = node_queue.remove_at(0);
StanzaNode node = queue_item.node;
if (node.name == "message" || node.name == "iq" || node.name == "presence") {
in_flight_stanzas[++h_outbound] = queue_item;
}
write_node.begin(stream, node);
}
}
public override void attach(XmppStream stream) {
stream.get_module(Bind.Module.IDENTITY).bound_to_resource.connect(check_enable);
stream.received_features_node.connect(check_resume);
stream.received_nonza.connect(on_received_nonza);
stream.received_message_stanza.connect(on_stanza_received);
stream.received_presence_stanza.connect(on_stanza_received);
stream.received_iq_stanza.connect(on_stanza_received);
}
public override void detach(XmppStream stream) {
stream.get_module(Bind.Module.IDENTITY).bound_to_resource.disconnect(check_enable);
stream.received_features_node.disconnect(check_resume);
stream.received_nonza.disconnect(on_received_nonza);
stream.received_message_stanza.disconnect(on_stanza_received);
stream.received_presence_stanza.disconnect(on_stanza_received);
stream.received_iq_stanza.disconnect(on_stanza_received);
}
public static void require(XmppStream stream) {
if (stream.get_module(IDENTITY) == null) stream.add_module(new PrivateXmlStorage.Module());
}
public override bool mandatory_outstanding(XmppStream stream) { return false; }
public override bool negotiation_active(XmppStream stream) {
return stream.has_flag(Flag.IDENTITY) && !stream.get_flag(Flag.IDENTITY).finished;
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
private void on_stanza_received(XmppStream stream, StanzaNode node) {
h_inbound++;
}
private void check_resume(XmppStream stream) {
if (stream_has_sm_feature(stream) && session_id != null) {
StanzaNode node = new StanzaNode.build("resume", NS_URI).add_self_xmlns()
.put_attribute("h", h_inbound.to_string())
.put_attribute("previd", session_id);
write_node.begin(stream, node);
stream.add_flag(new Flag());
}
}
private void check_enable(XmppStream stream) {
if (stream_has_sm_feature(stream) && session_id == null) {
StanzaNode node = new StanzaNode.build("enable", NS_URI).add_self_xmlns().put_attribute("resume", "true");
write_node.begin(stream, node);
stream.add_flag(new Flag());
h_outbound = 0;
}
}
private void on_received_nonza(XmppStream stream, StanzaNode node) {
if (node.ns_uri == NS_URI) {
if (node.name == "r") {
send_ack(stream);
} else if (node.name == "a") {
handle_ack(stream, node);
} else if (node.name in new string[]{"enabled", "resumed", "failed"}) {
stream.get_flag(Flag.IDENTITY).finished = true;
if (node.name == "enabled") {
h_inbound = 0;
session_id = node.get_attribute("id", NS_URI);
flags = stream.flags;
((IoXmppStream)stream).write_obj = this;
} else if (node.name == "resumed") {
stream.get_flag(Flag.IDENTITY).resumed = true;
foreach (XmppStreamFlag flag in flags) {
stream.add_flag(flag);
}
h_outbound = int.parse(node.get_attribute("h", NS_URI));
handle_incoming_h(stream, h_outbound);
foreach (var id in in_flight_stanzas.keys) {
node_queue.add(in_flight_stanzas[id]);
}
in_flight_stanzas.clear();
check_queue(stream);
((IoXmppStream)stream).write_obj = this;
} else if (node.name == "failed") {
session_id = null;
string? h_acked = node.get_attribute("h", NS_URI);
if (h_acked != null) {
h_outbound = int.parse(h_acked);
handle_incoming_h(stream, h_outbound);
}
foreach (var id in in_flight_stanzas.keys) {
in_flight_stanzas[id].promise.set_exception(new IOStreamError.WRITE("Stanza not acked and session not resumed"));
}
in_flight_stanzas.clear();
check_queue(stream);
stream.received_features_node(stream);
}
}
}
}
private void send_ack(XmppStream stream) {
StanzaNode node = new StanzaNode.build("a", NS_URI).add_self_xmlns().put_attribute("h", h_inbound.to_string());
write_node.begin(stream, node);
}
private void handle_ack(XmppStream stream, StanzaNode node) {
string? h_acked = node.get_attribute("h", NS_URI);
int parsed_int = int.parse(h_acked);
handle_incoming_h(stream, parsed_int);
check_queue(stream);
}
private void handle_incoming_h(XmppStream stream, int h) {
var remove_nrs = new ArrayList<int>();
foreach (int nr in in_flight_stanzas.keys) {
if (nr <= h) {
remove_nrs.add(nr);
}
}
foreach (int nr in remove_nrs) {
in_flight_stanzas[nr].promise.set_value(null);
in_flight_stanzas.unset(nr);
}
}
private bool stream_has_sm_feature(XmppStream stream) {
return stream.features.get_subnode("sm", NS_URI) != null;
}
}
public class Flag : XmppStreamFlag {
public static FlagIdentity<Flag> IDENTITY = new FlagIdentity<Flag>(NS_URI, "stream_management");
public bool finished = false;
public bool resumed = false;
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
}
}
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