feat(mqtt): implement PUBLISH QoS 0, SUBSCRIBE, and UNSUBSCRIBE handlers
Add ParsePub, ParseSubsOrUnsubs, ProcessPub (QoS 0), ProcessSubs, ProcessUnsubs, EnqueueSubAck, and EnqueueUnsubAck to MqttPacketHandlers. Wire PUB/SUB/UNSUB dispatch cases in MqttParser. Add ReadSlice to MqttReader for raw payload extraction. 18 new unit tests covering parsing, flags, error cases, QoS downgrade, and full flow. 1 new integration test verifying SUBSCRIBE handshake over TCP.
This commit is contained in:
Joseph Doherty
@@ -237,4 +237,280 @@ internal static class MqttPacketHandlers
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// Close the connection cleanly.
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c.CloseConnection(ClosedState.ClientClosed);
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}
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// =========================================================================
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// PUBLISH parsing + processing
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// =========================================================================
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/// <summary>
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/// Parses an MQTT PUBLISH packet from the reader.
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/// <paramref name="pl"/> is the remaining length, <paramref name="flags"/> is the lower
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/// nibble of the first byte (DUP/QoS/RETAIN).
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/// Mirrors Go <c>mqttParsePub()</c>.
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/// </summary>
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public static (MqttPublishInfo? pp, Exception? err) ParsePub(
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MqttReader r, int pl, byte flags, bool rejectQoS2)
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{
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var start = r.Position;
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// Extract QoS from flags bits 1-2.
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var qos = (byte)((flags & MqttPubFlag.QoS) >> 1);
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if (qos > 2)
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return (null, new InvalidOperationException($"QoS value must be 0, 1, or 2, got {qos}"));
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if (qos == 2 && rejectQoS2)
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return (null, new InvalidOperationException("QoS-2 PUBLISH rejected by server policy"));
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// Topic name (2-byte length prefix + UTF-8 bytes).
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byte[] topicBytes;
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try { topicBytes = r.ReadBytes("topic", copy: false); }
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catch (Exception ex) { return (null, ex); }
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if (topicBytes.Length == 0)
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return (null, new InvalidOperationException("empty topic in PUBLISH"));
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// Convert MQTT topic to NATS subject.
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byte[] subjectBytes;
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try { subjectBytes = MqttSubjectConverter.MqttTopicToNatsPubSubject(topicBytes); }
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catch (Exception ex) { return (null, ex); }
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// Packet identifier (QoS > 0 only).
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ushort pi = 0;
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if (qos > 0)
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{
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try { pi = r.ReadUInt16("packet identifier"); }
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catch (Exception ex) { return (null, ex); }
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if (pi == 0)
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return (null, new InvalidOperationException("packet identifier must not be 0 for QoS > 0"));
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}
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// Payload = remaining bytes in the packet.
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var consumed = r.Position - start;
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var payloadLen = pl - consumed;
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byte[]? payload = null;
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if (payloadLen > 0)
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{
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try { payload = r.ReadSlice(payloadLen, "publish payload"); }
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catch (Exception ex) { return (null, ex); }
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}
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else if (payloadLen < 0)
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{
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return (null, new InvalidOperationException("PUBLISH packet payload length underflow"));
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}
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var pp = new MqttPublishInfo
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{
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Topic = Encoding.UTF8.GetString(topicBytes),
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Subject = Encoding.UTF8.GetString(subjectBytes),
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Msg = payload,
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Qos = qos,
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Retain = (flags & MqttPubFlag.Retain) != 0,
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Dup = (flags & MqttPubFlag.Dup) != 0,
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Pi = pi,
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};
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return (pp, null);
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}
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/// <summary>
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/// Processes an inbound MQTT PUBLISH packet.
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/// QoS 0: routes immediately via NATS pub/sub. QoS 1/2: deferred to Task 5.
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/// Mirrors Go <c>mqttProcessPub()</c>.
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/// </summary>
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public static Exception? ProcessPub(ClientConnection c, MqttPublishInfo pp)
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{
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if (pp.Qos == 0)
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{
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// QoS 0: immediate delivery via internal routing.
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var payload = pp.Msg ?? [];
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c.ProcessInboundClientMsg(payload);
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return null;
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}
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// QoS 1/2: deferred to Task 5 (JetStream integration).
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return new NotImplementedException($"PUBLISH QoS {pp.Qos} not yet implemented");
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}
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// =========================================================================
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// SUBSCRIBE / UNSUBSCRIBE parsing + processing
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// =========================================================================
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/// <summary>
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/// Parses SUBSCRIBE or UNSUBSCRIBE packet filters from the reader.
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/// Returns (packetId, filters, error).
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/// Mirrors Go <c>mqttParseSubsOrUnsubs()</c>.
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/// </summary>
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public static (ushort pi, List<MqttFilter>? filters, Exception? err) ParseSubsOrUnsubs(
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MqttReader r, byte firstByte, int pl, bool isSub)
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{
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var kind = isSub ? "SUBSCRIBE" : "UNSUBSCRIBE";
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// Validate reserved flags (must be 0x02 per spec).
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var expectedFlags = isSub ? MqttConst.SubscribeFlags : MqttConst.UnsubscribeFlags;
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var actualFlags = (byte)(firstByte & MqttPacket.FlagMask);
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if (actualFlags != expectedFlags)
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return (0, null, new InvalidOperationException(
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$"{kind} reserved flags must be 0x{expectedFlags:X2}, got 0x{actualFlags:X2}"));
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var end = r.Position + pl;
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// Packet identifier.
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ushort pi;
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try { pi = r.ReadUInt16("packet identifier"); }
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catch (Exception ex) { return (0, null, ex); }
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if (pi == 0)
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return (0, null, new InvalidOperationException("packet identifier must not be 0"));
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var filters = new List<MqttFilter>();
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while (r.Position < end)
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{
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// Topic filter (2-byte length + UTF-8 bytes).
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byte[] topicBytes;
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try { topicBytes = r.ReadBytes("topic filter", copy: false); }
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catch (Exception ex) { return (0, null, ex); }
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if (topicBytes.Length == 0)
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return (0, null, new InvalidOperationException("empty topic filter"));
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// Convert MQTT filter to NATS subject.
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string natsSubject;
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try
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{
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var subjBytes = MqttSubjectConverter.MqttFilterToNatsSubject(topicBytes);
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natsSubject = Encoding.UTF8.GetString(subjBytes);
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}
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catch (Exception ex) { return (0, null, ex); }
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byte qos = 0;
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if (isSub)
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{
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try { qos = r.ReadByte("QoS"); }
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catch (Exception ex) { return (0, null, ex); }
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if (qos > 2)
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return (0, null, new InvalidOperationException($"invalid QoS value: {qos}"));
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}
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filters.Add(new MqttFilter
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{
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Filter = natsSubject,
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Qos = qos,
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Ttopic = topicBytes,
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});
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}
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if (filters.Count == 0)
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return (0, null, new InvalidOperationException(
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$"{kind} must contain at least one topic filter"));
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return (pi, filters, null);
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}
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/// <summary>
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/// Processes parsed SUBSCRIBE filters: creates NATS subscriptions and sends SUBACK.
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/// Mirrors Go <c>mqttProcessSubs()</c> (minimal — session/JetStream deferred to Task 5-6).
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/// </summary>
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public static Exception? ProcessSubs(ClientConnection c, ushort pi, List<MqttFilter> filters)
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{
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var mqtt = c.Mqtt!;
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foreach (var f in filters)
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{
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// Downgrade QoS 2 if configured.
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if (f.Qos == 2 && mqtt.DowngradeQoS2Sub)
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f.Qos = 1;
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// Create NATS subscription using the filter as SID.
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var sid = Encoding.UTF8.GetBytes(f.Filter);
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var subject = Encoding.UTF8.GetBytes(f.Filter);
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var (_, err) = c.ProcessSub(subject, queue: null, sid: sid, noForward: false);
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if (err != null)
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{
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// Mark as failure in SUBACK.
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f.Qos = MqttConst.SubAckFailure;
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}
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}
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EnqueueSubAck(c, pi, filters);
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return null;
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}
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/// <summary>
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/// Processes parsed UNSUBSCRIBE filters: removes subscriptions and sends UNSUBACK.
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/// Mirrors Go <c>mqttProcessUnsubs()</c> (minimal — session cleanup deferred to Task 6).
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/// </summary>
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public static Exception? ProcessUnsubs(ClientConnection c, ushort pi, List<MqttFilter> filters)
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{
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foreach (var f in filters)
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{
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var sid = Encoding.UTF8.GetBytes(f.Filter);
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c.RemoveSubBySid(sid);
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}
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EnqueueUnsubAck(c, pi);
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return null;
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}
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// =========================================================================
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// SUBACK / UNSUBACK encoding
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// =========================================================================
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/// <summary>
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/// Enqueues a SUBACK packet. Mirrors Go <c>mqttEnqueueSubAck()</c>.
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/// Format: [0x90] [var-int length] [PI high] [PI low] [QoS per filter...]
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/// </summary>
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public static void EnqueueSubAck(ClientConnection c, ushort pi, List<MqttFilter> filters)
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{
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var payloadLen = 2 + filters.Count;
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var packet = new byte[1 + VarIntSize(payloadLen) + payloadLen];
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var pos = 0;
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packet[pos++] = MqttPacket.SubAck;
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pos += WriteVarInt(packet.AsSpan(pos), payloadLen);
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packet[pos++] = (byte)(pi >> 8);
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packet[pos++] = (byte)(pi & 0xFF);
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foreach (var f in filters)
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packet[pos++] = f.Qos;
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lock (c)
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{
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c.EnqueueProto(packet.AsSpan(0, pos));
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}
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}
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/// <summary>
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/// Enqueues an UNSUBACK packet. Mirrors Go <c>mqttEnqueueUnsubAck()</c>.
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/// Format: [0xB0] [0x02] [PI high] [PI low]
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/// </summary>
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public static void EnqueueUnsubAck(ClientConnection c, ushort pi)
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{
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ReadOnlySpan<byte> unsuback =
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[MqttPacket.UnsubAck, 0x02, (byte)(pi >> 8), (byte)(pi & 0xFF)];
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lock (c)
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{
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c.EnqueueProto(unsuback);
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}
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}
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// =========================================================================
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// Helpers
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// =========================================================================
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private static int VarIntSize(int value)
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{
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if (value < 0x80) return 1;
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if (value < 0x4000) return 2;
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if (value < 0x200000) return 3;
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return 4;
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}
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private static int WriteVarInt(Span<byte> buf, int value)
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{
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var pos = 0;
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do
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{
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var b = (byte)(value & 0x7F);
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value >>= 7;
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if (value > 0) b |= 0x80;
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buf[pos++] = b;
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} while (value > 0);
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return pos;
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}
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}
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@@ -85,8 +85,10 @@ internal static class MqttParser
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switch (pt)
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{
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case MqttPacket.Pub:
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// TODO: Task 4 — MqttParsePub + MqttProcessPub
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err = new NotImplementedException("PUBLISH not yet implemented");
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var pubFlags = (byte)(b & MqttPacket.FlagMask);
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var (pp, pubErr) = MqttPacketHandlers.ParsePub(r, pl, pubFlags, mqtt.RejectQoS2Pub);
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if (pubErr != null) { err = pubErr; break; }
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err = MqttPacketHandlers.ProcessPub(c, pp!);
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break;
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case MqttPacket.PubAck:
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@@ -110,13 +112,15 @@ internal static class MqttParser
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break;
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case MqttPacket.Sub:
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// TODO: Task 4 — MqttParseSubs + MqttProcessSubs
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err = new NotImplementedException("SUBSCRIBE not yet implemented");
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var (subPi, subFilters, subErr) = MqttPacketHandlers.ParseSubsOrUnsubs(r, b, pl, isSub: true);
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if (subErr != null) { err = subErr; break; }
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err = MqttPacketHandlers.ProcessSubs(c, subPi, subFilters!);
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break;
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case MqttPacket.Unsub:
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// TODO: Task 4 — MqttParseUnsubs + MqttProcessUnsubs
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err = new NotImplementedException("UNSUBSCRIBE not yet implemented");
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var (unsubPi, unsubFilters, unsubErr) = MqttPacketHandlers.ParseSubsOrUnsubs(r, b, pl, isSub: false);
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if (unsubErr != null) { err = unsubErr; break; }
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err = MqttPacketHandlers.ProcessUnsubs(c, unsubPi, unsubFilters!);
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break;
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case MqttPacket.Ping:
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@@ -128,4 +128,21 @@ internal sealed class MqttReader
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Position += 2;
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return value;
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}
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/// <summary>
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/// Reads exactly <paramref name="count"/> raw bytes without a length prefix.
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/// Used for PUBLISH payloads where the length is known from the remaining length field.
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/// </summary>
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public byte[] ReadSlice(int count, string field)
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{
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if (count == 0)
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return [];
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if (Position + count > _buffer.Length)
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throw new InvalidOperationException($"error reading {field}: {nameof(EndOfStreamException)}");
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var start = Position;
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Position += count;
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return _buffer[start..Position];
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}
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}
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@@ -250,6 +250,104 @@ public sealed class ServerBootTests : IDisposable
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return result.ToArray();
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}
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/// <summary>
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/// End-to-end: CONNECT → SUBSCRIBE → verify SUBACK over the wire.
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/// </summary>
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[Fact]
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public async Task MqttBoot_SubscribeHandshake_ShouldReceiveSubAck()
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{
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var opts = new ServerOptions
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{
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Host = "127.0.0.1",
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Port = 0,
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Mqtt = { Port = -1, Host = "127.0.0.1" },
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};
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var (server, err) = NatsServer.NewServer(opts);
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err.ShouldBeNull();
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server.ShouldNotBeNull();
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try
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{
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server!.Start();
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var mqttAddr = server.MqttAddr();
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mqttAddr.ShouldNotBeNull();
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using var tcp = new System.Net.Sockets.TcpClient();
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
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await tcp.ConnectAsync(mqttAddr!.Address, mqttAddr.Port, cts.Token);
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var stream = tcp.GetStream();
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// 1. CONNECT → CONNACK
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var connectPacket = BuildMqttConnectPacket("sub-test");
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await stream.WriteAsync(connectPacket, cts.Token);
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await stream.FlushAsync(cts.Token);
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var connack = new byte[4];
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await ReadExactAsync(stream, connack, cts.Token);
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connack[0].ShouldBe((byte)0x20); // CONNACK
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connack[3].ShouldBe((byte)0x00); // Accepted
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// 2. SUBSCRIBE to "test/sub" QoS 0 → SUBACK
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var subscribePacket = BuildMqttSubscribePacket(packetId: 1, topic: "test/sub", qos: 0);
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await stream.WriteAsync(subscribePacket, cts.Token);
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await stream.FlushAsync(cts.Token);
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// SUBACK: [0x90] [0x03] [PI high] [PI low] [granted QoS]
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var suback = new byte[5];
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await ReadExactAsync(stream, suback, cts.Token);
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suback[0].ShouldBe((byte)0x90); // SUBACK
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suback[1].ShouldBe((byte)0x03); // remaining length = 3
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suback[2].ShouldBe((byte)0x00); // PI high
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suback[3].ShouldBe((byte)0x01); // PI low = 1
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suback[4].ShouldBe((byte)0x00); // granted QoS 0
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}
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finally
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{
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server!.Shutdown();
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}
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}
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/// <summary>Builds a minimal MQTT SUBSCRIBE packet.</summary>
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private static byte[] BuildMqttSubscribePacket(ushort packetId, string topic, byte qos)
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{
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var topicBytes = System.Text.Encoding.UTF8.GetBytes(topic);
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var payload = new List<byte>();
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payload.Add((byte)(packetId >> 8));
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payload.Add((byte)(packetId & 0xFF));
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payload.Add((byte)(topicBytes.Length >> 8));
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payload.Add((byte)(topicBytes.Length & 0xFF));
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payload.AddRange(topicBytes);
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payload.Add(qos);
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var result = new List<byte>();
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result.Add(0x82); // SUBSCRIBE + flags 0x02
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var remLen = payload.Count;
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do
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{
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var b = (byte)(remLen & 0x7F);
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remLen >>= 7;
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if (remLen > 0) b |= 0x80;
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result.Add(b);
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} while (remLen > 0);
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result.AddRange(payload);
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return result.ToArray();
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}
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/// <summary>Reads exactly <paramref name="buffer"/>.Length bytes from the stream.</summary>
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private static async Task ReadExactAsync(System.Net.Sockets.NetworkStream stream, byte[] buffer, CancellationToken ct)
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{
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var totalRead = 0;
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while (totalRead < buffer.Length)
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{
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var n = await stream.ReadAsync(buffer.AsMemory(totalRead, buffer.Length - totalRead), ct);
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if (n == 0) break;
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totalRead += n;
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}
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totalRead.ShouldBe(buffer.Length);
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}
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/// <summary>
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/// Validates that Shutdown() after Start() completes cleanly.
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/// Uses DontListen to skip TCP binding — tests lifecycle only.
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@@ -24,7 +24,7 @@ public sealed class MqttParserTests
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/// </summary>
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private static ClientConnection CreateMqttClient()
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{
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var c = new ClientConnection(ClientKind.Client);
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var c = new ClientConnection(ClientKind.Client, nc: new MemoryStream());
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c.InitMqtt(new MqttHandler());
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return c;
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}
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@@ -164,37 +164,38 @@ public sealed class MqttParserTests
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[Fact]
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public void Parse_SingleByteRemainingLength_ShouldWork()
|
||||
{
|
||||
// SUB packet with remaining length = 5 (single byte < 128)
|
||||
// After CONNECT is received, a SUB packet should parse the remaining length correctly.
|
||||
// SUBSCRIBE with remaining length = 6 (single byte < 128).
|
||||
// Proves single-byte remaining length decoding works.
|
||||
var c = CreateMqttClient();
|
||||
c.Flags |= ClientFlags.ConnectReceived;
|
||||
|
||||
// SUBSCRIBE: type=0x82, remaining len=5, then 5 bytes of payload
|
||||
var buf = new byte[] { 0x82, 0x05, 0x00, 0x01, 0x00, 0x01, 0x74 };
|
||||
// SUBSCRIBE: type=0x82, remlen=6, PI=1, filter="t" (len=1), QoS=0
|
||||
var buf = new byte[] { 0x82, 0x06, 0x00, 0x01, 0x00, 0x01, (byte)'t', 0x00 };
|
||||
var err = MqttParser.Parse(c, buf, buf.Length);
|
||||
// Will hit NotImplementedException for SUBSCRIBE — that's fine, it proves parsing worked.
|
||||
err.ShouldNotBeNull();
|
||||
err.ShouldBeOfType<NotImplementedException>();
|
||||
err.ShouldBeNull();
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void Parse_TwoByteRemainingLength_ShouldWork()
|
||||
{
|
||||
// PUBLISH QoS 0 with remaining length = 200 → encoded as [0xC8, 0x01].
|
||||
// Proves two-byte remaining length decoding works.
|
||||
var c = CreateMqttClient();
|
||||
c.Flags |= ClientFlags.ConnectReceived;
|
||||
|
||||
// Remaining length = 200 → encoded as [0xC8, 0x01]
|
||||
// (200 & 0x7F) | 0x80 = 0xC8, 200 >> 7 = 1 → 0x01
|
||||
// type(1) + remlen(2) + payload(200) = 203 bytes total.
|
||||
var buf = new byte[203];
|
||||
buf[0] = MqttPacket.Pub;
|
||||
buf[0] = MqttPacket.Pub; // 0x30, QoS 0
|
||||
buf[1] = 0xC8;
|
||||
buf[2] = 0x01;
|
||||
// Remaining 200 bytes are zero (payload).
|
||||
// Topic "t": length prefix (2 bytes) + 1 byte.
|
||||
buf[3] = 0x00;
|
||||
buf[4] = 0x01;
|
||||
buf[5] = (byte)'t';
|
||||
// Bytes 6..202 are zero (197-byte payload).
|
||||
|
||||
var err = MqttParser.Parse(c, buf, buf.Length);
|
||||
err.ShouldNotBeNull();
|
||||
err.ShouldBeOfType<NotImplementedException>(); // PUBLISH not yet implemented
|
||||
err.ShouldBeNull();
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
|
||||
530
dotnet/tests/ZB.MOM.NatsNet.Server.Tests/Mqtt/MqttPubSubTests.cs
Normal file
530
dotnet/tests/ZB.MOM.NatsNet.Server.Tests/Mqtt/MqttPubSubTests.cs
Normal file
@@ -0,0 +1,530 @@
|
||||
// Copyright 2020-2026 The NATS Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
using System.Text;
|
||||
using Shouldly;
|
||||
using ZB.MOM.NatsNet.Server;
|
||||
using ZB.MOM.NatsNet.Server.Internal;
|
||||
using ZB.MOM.NatsNet.Server.Mqtt;
|
||||
|
||||
namespace ZB.MOM.NatsNet.Server.Tests.Mqtt;
|
||||
|
||||
/// <summary>
|
||||
/// Unit tests for MQTT PUBLISH, SUBSCRIBE, and UNSUBSCRIBE packet handling.
|
||||
/// </summary>
|
||||
public sealed class MqttPubSubTests
|
||||
{
|
||||
private static ClientConnection CreateConnectedMqttClient()
|
||||
{
|
||||
var ms = new MemoryStream();
|
||||
var c = new ClientConnection(ClientKind.Client, nc: ms);
|
||||
c.InitMqtt(new MqttHandler());
|
||||
c.Flags |= ClientFlags.ConnectReceived;
|
||||
return c;
|
||||
}
|
||||
|
||||
private static MemoryStream GetStream(ClientConnection c)
|
||||
{
|
||||
return (MemoryStream)typeof(ClientConnection)
|
||||
.GetField("_nc", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)!
|
||||
.GetValue(c)!;
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// PUBLISH parsing
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_QoS0_ShouldParseCorrectly()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
// Topic "test/topic" + payload "hello"
|
||||
var topic = Encoding.UTF8.GetBytes("test/topic");
|
||||
var payload = Encoding.UTF8.GetBytes("hello");
|
||||
var data = new List<byte>();
|
||||
data.Add((byte)(topic.Length >> 8));
|
||||
data.Add((byte)(topic.Length & 0xFF));
|
||||
data.AddRange(topic);
|
||||
data.AddRange(payload);
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
byte flags = 0x00; // QoS 0, no retain, no dup
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Count, flags, rejectQoS2: false);
|
||||
err.ShouldBeNull();
|
||||
pp.ShouldNotBeNull();
|
||||
pp!.Topic.ShouldBe("test/topic");
|
||||
pp.Subject.ShouldNotBeEmpty();
|
||||
pp.Qos.ShouldBe((byte)0);
|
||||
pp.Pi.ShouldBe((ushort)0);
|
||||
pp.Retain.ShouldBeFalse();
|
||||
pp.Dup.ShouldBeFalse();
|
||||
Encoding.UTF8.GetString(pp.Msg!).ShouldBe("hello");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_QoS1_ShouldParsePacketId()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var topic = Encoding.UTF8.GetBytes("a/b");
|
||||
var data = new List<byte>();
|
||||
data.Add((byte)(topic.Length >> 8));
|
||||
data.Add((byte)(topic.Length & 0xFF));
|
||||
data.AddRange(topic);
|
||||
data.Add(0x00); data.Add(0x07); // PI = 7
|
||||
data.AddRange(Encoding.UTF8.GetBytes("msg"));
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
byte flags = MqttPubFlag.QoS1; // QoS 1 = 0x02
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Count, flags, rejectQoS2: false);
|
||||
err.ShouldBeNull();
|
||||
pp!.Qos.ShouldBe((byte)1);
|
||||
pp.Pi.ShouldBe((ushort)7);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_QoS2Rejected_ShouldReturnError()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var topic = Encoding.UTF8.GetBytes("t");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x01);
|
||||
data.AddRange(topic);
|
||||
data.Add(0x00); data.Add(0x01); // PI = 1
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
byte flags = MqttPubFlag.QoS2; // QoS 2 = 0x04
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Count, flags, rejectQoS2: true);
|
||||
err.ShouldNotBeNull();
|
||||
err.Message.ShouldContain("QoS-2 PUBLISH rejected");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_EmptyTopic_ShouldReturnError()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var data = new byte[] { 0x00, 0x00 }; // zero-length topic
|
||||
r.Reset(data);
|
||||
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Length, 0x00, rejectQoS2: false);
|
||||
err.ShouldNotBeNull();
|
||||
err.Message.ShouldContain("empty topic");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_RetainAndDup_ShouldSetFlags()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var topic = Encoding.UTF8.GetBytes("t");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x01);
|
||||
data.AddRange(topic);
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
byte flags = MqttPubFlag.Retain | MqttPubFlag.Dup; // 0x09
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Count, flags, rejectQoS2: false);
|
||||
err.ShouldBeNull();
|
||||
pp!.Retain.ShouldBeTrue();
|
||||
pp.Dup.ShouldBeTrue();
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParsePub_EmptyPayload_ShouldSucceed()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var topic = Encoding.UTF8.GetBytes("t");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x01);
|
||||
data.AddRange(topic);
|
||||
// No payload bytes.
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
var (pp, err) = MqttPacketHandlers.ParsePub(r, data.Count, 0x00, rejectQoS2: false);
|
||||
err.ShouldBeNull();
|
||||
pp!.Msg.ShouldBeNull();
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// PUBLISH processing via parser
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void Parser_PublishQoS0_ShouldSucceed()
|
||||
{
|
||||
var c = CreateConnectedMqttClient();
|
||||
|
||||
// Build PUBLISH: type=0x30 (QoS 0), topic="test", payload="hi"
|
||||
var topic = Encoding.UTF8.GetBytes("test");
|
||||
var payload = Encoding.UTF8.GetBytes("hi");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add((byte)topic.Length);
|
||||
data.AddRange(topic);
|
||||
data.AddRange(payload);
|
||||
|
||||
var buf = new List<byte>();
|
||||
buf.Add(MqttPacket.Pub); // 0x30
|
||||
buf.Add((byte)data.Count);
|
||||
buf.AddRange(data);
|
||||
|
||||
var err = MqttParser.Parse(c, buf.ToArray(), buf.Count);
|
||||
err.ShouldBeNull();
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void Parser_PublishQoS1_ShouldReturnNotImplemented()
|
||||
{
|
||||
var c = CreateConnectedMqttClient();
|
||||
|
||||
// PUBLISH QoS 1: type=0x32, topic="t", PI=1, payload="x"
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x01); data.Add((byte)'t'); // topic
|
||||
data.Add(0x00); data.Add(0x01); // PI = 1
|
||||
data.Add((byte)'x'); // payload
|
||||
|
||||
var buf = new List<byte>();
|
||||
buf.Add((byte)(MqttPacket.Pub | MqttPubFlag.QoS1)); // 0x32
|
||||
buf.Add((byte)data.Count);
|
||||
buf.AddRange(data);
|
||||
|
||||
var err = MqttParser.Parse(c, buf.ToArray(), buf.Count);
|
||||
err.ShouldNotBeNull();
|
||||
err.ShouldBeOfType<NotImplementedException>();
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// SUBSCRIBE parsing
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void ParseSubs_SingleFilter_ShouldParseCorrectly()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var filter = Encoding.UTF8.GetBytes("test/topic");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x0A); // PI = 10
|
||||
data.Add((byte)(filter.Length >> 8));
|
||||
data.Add((byte)(filter.Length & 0xFF));
|
||||
data.AddRange(filter);
|
||||
data.Add(0x01); // QoS 1
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
var (pi, filters, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, (byte)(MqttPacket.Sub | MqttConst.SubscribeFlags), data.Count, isSub: true);
|
||||
err.ShouldBeNull();
|
||||
pi.ShouldBe((ushort)10);
|
||||
filters.ShouldNotBeNull();
|
||||
filters!.Count.ShouldBe(1);
|
||||
filters[0].Filter.ShouldNotBeEmpty();
|
||||
filters[0].Qos.ShouldBe((byte)1);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParseSubs_MultipleFilters_ShouldParseAll()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var f1 = Encoding.UTF8.GetBytes("a/b");
|
||||
var f2 = Encoding.UTF8.GetBytes("c/d");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x01); // PI = 1
|
||||
data.Add((byte)(f1.Length >> 8)); data.Add((byte)(f1.Length & 0xFF));
|
||||
data.AddRange(f1);
|
||||
data.Add(0x00); // QoS 0
|
||||
data.Add((byte)(f2.Length >> 8)); data.Add((byte)(f2.Length & 0xFF));
|
||||
data.AddRange(f2);
|
||||
data.Add(0x02); // QoS 2
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
var (pi, filters, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, (byte)(MqttPacket.Sub | MqttConst.SubscribeFlags), data.Count, isSub: true);
|
||||
err.ShouldBeNull();
|
||||
filters!.Count.ShouldBe(2);
|
||||
filters[0].Qos.ShouldBe((byte)0);
|
||||
filters[1].Qos.ShouldBe((byte)2);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParseSubs_WrongFlags_ShouldReturnError()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var data = new byte[] { 0x00, 0x01, 0x00, 0x01, (byte)'t', 0x00 };
|
||||
r.Reset(data);
|
||||
|
||||
// Wrong flags: 0x00 instead of 0x02
|
||||
var (_, _, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, MqttPacket.Sub, data.Length, isSub: true); // flags = 0x00
|
||||
err.ShouldNotBeNull();
|
||||
err.Message.ShouldContain("reserved flags");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParseSubs_ZeroPacketId_ShouldReturnError()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var data = new byte[] { 0x00, 0x00, 0x00, 0x01, (byte)'t', 0x00 };
|
||||
r.Reset(data);
|
||||
|
||||
var (_, _, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, (byte)(MqttPacket.Sub | MqttConst.SubscribeFlags), data.Length, isSub: true);
|
||||
err.ShouldNotBeNull();
|
||||
err.Message.ShouldContain("packet identifier must not be 0");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void ParseSubs_InvalidQoS_ShouldReturnError()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var data = new byte[] { 0x00, 0x01, 0x00, 0x01, (byte)'t', 0x03 }; // QoS=3, invalid
|
||||
r.Reset(data);
|
||||
|
||||
var (_, _, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, (byte)(MqttPacket.Sub | MqttConst.SubscribeFlags), data.Length, isSub: true);
|
||||
err.ShouldNotBeNull();
|
||||
err.Message.ShouldContain("invalid QoS");
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// SUBSCRIBE processing via parser
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void Parser_Subscribe_ShouldSendSubAck()
|
||||
{
|
||||
var c = CreateConnectedMqttClient();
|
||||
|
||||
// Build SUBSCRIBE: PI=5, filter="test/topic", QoS=1
|
||||
var filter = Encoding.UTF8.GetBytes("test/topic");
|
||||
var payload = new List<byte>();
|
||||
payload.Add(0x00); payload.Add(0x05); // PI = 5
|
||||
payload.Add((byte)(filter.Length >> 8));
|
||||
payload.Add((byte)(filter.Length & 0xFF));
|
||||
payload.AddRange(filter);
|
||||
payload.Add(0x01); // QoS 1
|
||||
|
||||
var buf = new List<byte>();
|
||||
buf.Add((byte)(MqttPacket.Sub | MqttConst.SubscribeFlags)); // 0x82
|
||||
buf.Add((byte)payload.Count);
|
||||
buf.AddRange(payload);
|
||||
|
||||
var err = MqttParser.Parse(c, buf.ToArray(), buf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
// Verify SUBACK was written.
|
||||
var ms = GetStream(c);
|
||||
var data = ms.ToArray();
|
||||
data.Length.ShouldBeGreaterThan(0);
|
||||
data[0].ShouldBe(MqttPacket.SubAck); // 0x90
|
||||
// SUBACK payload: PI (2 bytes) + QoS per filter (1 byte) = 3
|
||||
// Format: [0x90] [0x03] [0x00] [0x05] [0x01]
|
||||
data[1].ShouldBe((byte)0x03); // remaining length
|
||||
data[2].ShouldBe((byte)0x00); // PI high
|
||||
data[3].ShouldBe((byte)0x05); // PI low
|
||||
data[4].ShouldBe((byte)0x01); // granted QoS 1
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public void Parser_Subscribe_QoS2Downgrade_ShouldGrantQoS1()
|
||||
{
|
||||
var c = CreateConnectedMqttClient();
|
||||
c.Mqtt!.DowngradeQoS2Sub = true;
|
||||
|
||||
var filter = Encoding.UTF8.GetBytes("a");
|
||||
var payload = new List<byte>();
|
||||
payload.Add(0x00); payload.Add(0x01); // PI = 1
|
||||
payload.Add(0x00); payload.Add((byte)filter.Length);
|
||||
payload.AddRange(filter);
|
||||
payload.Add(0x02); // QoS 2 requested
|
||||
|
||||
var buf = new List<byte>();
|
||||
buf.Add((byte)(MqttPacket.Sub | MqttConst.SubscribeFlags));
|
||||
buf.Add((byte)payload.Count);
|
||||
buf.AddRange(payload);
|
||||
|
||||
var err = MqttParser.Parse(c, buf.ToArray(), buf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
var ms = GetStream(c);
|
||||
var data = ms.ToArray();
|
||||
// Last byte of SUBACK is the granted QoS, should be 1 (downgraded from 2).
|
||||
data[^1].ShouldBe((byte)0x01);
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// UNSUBSCRIBE parsing
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void ParseUnsubs_SingleFilter_ShouldParseCorrectly()
|
||||
{
|
||||
var r = new MqttReader();
|
||||
var filter = Encoding.UTF8.GetBytes("test/topic");
|
||||
var data = new List<byte>();
|
||||
data.Add(0x00); data.Add(0x03); // PI = 3
|
||||
data.Add((byte)(filter.Length >> 8));
|
||||
data.Add((byte)(filter.Length & 0xFF));
|
||||
data.AddRange(filter);
|
||||
// No QoS byte for UNSUBSCRIBE
|
||||
r.Reset(data.ToArray());
|
||||
|
||||
var (pi, filters, err) = MqttPacketHandlers.ParseSubsOrUnsubs(
|
||||
r, (byte)(MqttPacket.Unsub | MqttConst.UnsubscribeFlags), data.Count, isSub: false);
|
||||
err.ShouldBeNull();
|
||||
pi.ShouldBe((ushort)3);
|
||||
filters!.Count.ShouldBe(1);
|
||||
filters[0].Qos.ShouldBe((byte)0); // Always 0 for unsub
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// UNSUBSCRIBE processing via parser
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void Parser_Unsubscribe_ShouldSendUnsubAck()
|
||||
{
|
||||
var c = CreateConnectedMqttClient();
|
||||
|
||||
// First subscribe to create the subscription.
|
||||
var filter = Encoding.UTF8.GetBytes("test/unsub");
|
||||
var subPayload = new List<byte>();
|
||||
subPayload.Add(0x00); subPayload.Add(0x01); // PI = 1
|
||||
subPayload.Add((byte)(filter.Length >> 8));
|
||||
subPayload.Add((byte)(filter.Length & 0xFF));
|
||||
subPayload.AddRange(filter);
|
||||
subPayload.Add(0x00); // QoS 0
|
||||
|
||||
var subBuf = new List<byte>();
|
||||
subBuf.Add((byte)(MqttPacket.Sub | MqttConst.SubscribeFlags));
|
||||
subBuf.Add((byte)subPayload.Count);
|
||||
subBuf.AddRange(subPayload);
|
||||
MqttParser.Parse(c, subBuf.ToArray(), subBuf.Count);
|
||||
|
||||
// Reset stream to capture UNSUBACK only.
|
||||
var ms = GetStream(c);
|
||||
ms.SetLength(0);
|
||||
|
||||
// Now unsubscribe.
|
||||
var unsubPayload = new List<byte>();
|
||||
unsubPayload.Add(0x00); unsubPayload.Add(0x02); // PI = 2
|
||||
unsubPayload.Add((byte)(filter.Length >> 8));
|
||||
unsubPayload.Add((byte)(filter.Length & 0xFF));
|
||||
unsubPayload.AddRange(filter);
|
||||
|
||||
var unsubBuf = new List<byte>();
|
||||
unsubBuf.Add((byte)(MqttPacket.Unsub | MqttConst.UnsubscribeFlags)); // 0xA2
|
||||
unsubBuf.Add((byte)unsubPayload.Count);
|
||||
unsubBuf.AddRange(unsubPayload);
|
||||
|
||||
var err = MqttParser.Parse(c, unsubBuf.ToArray(), unsubBuf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
// Verify UNSUBACK: [0xB0] [0x02] [PI high] [PI low]
|
||||
var data = ms.ToArray();
|
||||
data.Length.ShouldBe(4);
|
||||
data[0].ShouldBe(MqttPacket.UnsubAck); // 0xB0
|
||||
data[1].ShouldBe((byte)0x02);
|
||||
data[2].ShouldBe((byte)0x00); // PI high
|
||||
data[3].ShouldBe((byte)0x02); // PI low
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// Full CONNECT + SUBSCRIBE + PUBLISH + UNSUBSCRIBE flow
|
||||
// =========================================================================
|
||||
|
||||
[Fact]
|
||||
public void Parser_FullFlow_ConnectSubPubUnsub()
|
||||
{
|
||||
var ms = new MemoryStream();
|
||||
var c = new ClientConnection(ClientKind.Client, nc: ms);
|
||||
c.InitMqtt(new MqttHandler());
|
||||
|
||||
// 1. CONNECT
|
||||
var connectBuf = BuildConnectPacket("flow-test");
|
||||
var err = MqttParser.Parse(c, connectBuf, connectBuf.Length);
|
||||
err.ShouldBeNull();
|
||||
(c.Flags & ClientFlags.ConnectReceived).ShouldNotBe((ClientFlags)0);
|
||||
|
||||
// 2. SUBSCRIBE to "test/flow" QoS 0
|
||||
var filter = Encoding.UTF8.GetBytes("test/flow");
|
||||
var subPayload = new List<byte>();
|
||||
subPayload.Add(0x00); subPayload.Add(0x01); // PI = 1
|
||||
subPayload.Add((byte)(filter.Length >> 8));
|
||||
subPayload.Add((byte)(filter.Length & 0xFF));
|
||||
subPayload.AddRange(filter);
|
||||
subPayload.Add(0x00); // QoS 0
|
||||
|
||||
var subBuf = new List<byte>();
|
||||
subBuf.Add((byte)(MqttPacket.Sub | MqttConst.SubscribeFlags));
|
||||
subBuf.Add((byte)subPayload.Count);
|
||||
subBuf.AddRange(subPayload);
|
||||
|
||||
err = MqttParser.Parse(c, subBuf.ToArray(), subBuf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
// 3. PUBLISH to "test/flow" QoS 0
|
||||
var topic = Encoding.UTF8.GetBytes("test/flow");
|
||||
var pubData = new List<byte>();
|
||||
pubData.Add((byte)(topic.Length >> 8));
|
||||
pubData.Add((byte)(topic.Length & 0xFF));
|
||||
pubData.AddRange(topic);
|
||||
pubData.AddRange(Encoding.UTF8.GetBytes("hello"));
|
||||
|
||||
var pubBuf = new List<byte>();
|
||||
pubBuf.Add(MqttPacket.Pub);
|
||||
pubBuf.Add((byte)pubData.Count);
|
||||
pubBuf.AddRange(pubData);
|
||||
|
||||
err = MqttParser.Parse(c, pubBuf.ToArray(), pubBuf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
// 4. UNSUBSCRIBE from "test/flow"
|
||||
var unsubPayload = new List<byte>();
|
||||
unsubPayload.Add(0x00); unsubPayload.Add(0x02); // PI = 2
|
||||
unsubPayload.Add((byte)(filter.Length >> 8));
|
||||
unsubPayload.Add((byte)(filter.Length & 0xFF));
|
||||
unsubPayload.AddRange(filter);
|
||||
|
||||
var unsubBuf = new List<byte>();
|
||||
unsubBuf.Add((byte)(MqttPacket.Unsub | MqttConst.UnsubscribeFlags));
|
||||
unsubBuf.Add((byte)unsubPayload.Count);
|
||||
unsubBuf.AddRange(unsubPayload);
|
||||
|
||||
err = MqttParser.Parse(c, unsubBuf.ToArray(), unsubBuf.Count);
|
||||
err.ShouldBeNull();
|
||||
|
||||
// Verify: CONNACK(4) + SUBACK(5) + UNSUBACK(4) = 13 bytes written
|
||||
var data = ms.ToArray();
|
||||
data.Length.ShouldBe(13);
|
||||
data[0].ShouldBe(MqttPacket.ConnectAck); // CONNACK
|
||||
data[4].ShouldBe(MqttPacket.SubAck); // SUBACK
|
||||
data[9].ShouldBe(MqttPacket.UnsubAck); // UNSUBACK
|
||||
}
|
||||
|
||||
/// <summary>Builds a minimal MQTT CONNECT packet.</summary>
|
||||
private static byte[] BuildConnectPacket(string clientId)
|
||||
{
|
||||
var payload = new List<byte>();
|
||||
payload.AddRange(new byte[] { 0x00, 0x04 });
|
||||
payload.AddRange(Encoding.UTF8.GetBytes("MQTT"));
|
||||
payload.Add(0x04);
|
||||
payload.Add(0x02); // clean session
|
||||
payload.AddRange(new byte[] { 0x00, 0x3C });
|
||||
var cidBytes = Encoding.UTF8.GetBytes(clientId);
|
||||
payload.Add((byte)(cidBytes.Length >> 8));
|
||||
payload.Add((byte)(cidBytes.Length & 0xFF));
|
||||
payload.AddRange(cidBytes);
|
||||
|
||||
var result = new List<byte> { MqttPacket.Connect };
|
||||
var remLen = payload.Count;
|
||||
do
|
||||
{
|
||||
var b = (byte)(remLen & 0x7F);
|
||||
remLen >>= 7;
|
||||
if (remLen > 0) b |= 0x80;
|
||||
result.Add(b);
|
||||
} while (remLen > 0);
|
||||
result.AddRange(payload);
|
||||
return result.ToArray();
|
||||
}
|
||||
}
|
||||
@@ -1,6 +1,6 @@
|
||||
# NATS .NET Porting Status Report
|
||||
|
||||
Generated: 2026-03-01 20:48:23 UTC
|
||||
Generated: 2026-03-01 21:04:38 UTC
|
||||
|
||||
## Modules (12 total)
|
||||
|
||||
|
||||
Reference in New Issue
Block a user