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|
use super::{
PacketId,
field::{self, Field, FieldBuffer},
protocol,
qos::Qos,
};
pub struct Connect<'a> {
pub client_id: &'a str,
pub clean_session: bool,
pub username: Option<&'a str>,
pub password: Option<&'a [u8]>,
pub will_topic: Option<&'a str>,
pub will_payload: Option<&'a [u8]>,
pub will_retain: bool,
pub keepalive: Option<u16>,
}
pub fn connect<'a>(buffer: &mut FieldBuffer<'a>, connect: Connect<'a>) {
let mut flags = 0;
if connect.clean_session {
flags |= protocol::CONNECT_FLAG_CLEAN_SESSION;
}
if connect.username.is_some() {
flags |= protocol::CONNECT_FLAG_USERNAME;
}
if connect.password.is_some() {
flags |= protocol::CONNECT_FLAG_PASSWORD;
}
if connect.will_topic.is_some() {
flags |= protocol::CONNECT_FLAG_WILL_FLAG;
}
if connect.will_retain {
flags |= protocol::CONNECT_FLAG_WILL_RETAIN;
}
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_CONNECT,
0,
)));
buffer.push(Field::VarInt(0));
buffer.push(Field::LenPrefixedString(protocol::PROTOCOL_NAME));
buffer.push(Field::U8(protocol::PROTOCOL_LEVEL_3_1_1));
buffer.push(Field::U8(flags));
buffer.push(Field::U16(connect.keepalive.unwrap_or(0)));
buffer.push(Field::LenPrefixedString(connect.client_id));
if let Some(will_topic) = connect.will_topic {
buffer.push(Field::LenPrefixedString(will_topic));
buffer.push(Field::LenPrefixedBuffer(
connect.will_payload.unwrap_or(&[]),
));
}
if let Some(username) = connect.username {
buffer.push(Field::LenPrefixedString(username));
}
if let Some(password) = connect.password {
buffer.push(Field::LenPrefixedBuffer(password));
}
let message_size = field::fields_size(&buffer.as_slice()[2..]);
buffer.set(1, Field::VarInt(u32::try_from(message_size).unwrap()));
}
pub struct Publish<'a> {
pub topic: &'a str,
pub payload: &'a [u8],
pub qos: Qos,
pub retain: bool,
pub dup: bool,
pub packet_id: Option<PacketId>,
}
pub fn publish<'a>(buffer: &mut FieldBuffer<'a>, publish: Publish<'a>) {
let mut flags = 0u8;
// Set QoS bits (bits 1-2)
flags |= (publish.qos.to_u8() & 0x03) << 1;
// Set RETAIN flag (bit 0)
if publish.retain {
flags |= 0x01;
}
// Set DUP flag (bit 3)
if publish.dup {
flags |= 0x08;
}
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_PUBLISH,
flags,
)));
buffer.push(Field::VarInt(0));
buffer.push(Field::LenPrefixedString(publish.topic));
// Packet ID is only present for QoS 1 and 2
if publish.qos.to_u8() > 0 {
// TODO: turn this into a warning
let packet_id = publish.packet_id.expect("packet_id required for QoS > 0");
buffer.push(Field::U16(packet_id.into()));
}
buffer.push(Field::Buffer(publish.payload));
let message_size = field::fields_size(&buffer.as_slice()[2..]);
buffer.set(1, Field::VarInt(u32::try_from(message_size).unwrap()));
}
pub struct Subscribe<'a> {
pub topic: &'a str,
pub qos: Qos,
pub packet_id: PacketId,
}
pub fn subscribe<'a>(buffer: &mut FieldBuffer<'a>, subscribe: Subscribe<'a>) {
// SUBSCRIBE packets have fixed header flags (reserved bits)
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_SUBSCRIBE,
protocol::SUBSCRIBE_HEADER_FLAGS,
)));
buffer.push(Field::VarInt(0));
// Variable header: packet identifier
buffer.push(Field::U16(subscribe.packet_id.into()));
// Payload: topic filter + QoS
buffer.push(Field::LenPrefixedString(subscribe.topic));
buffer.push(Field::U8(subscribe.qos.to_u8()));
let message_size = field::fields_size(&buffer.as_slice()[2..]);
buffer.set(1, Field::VarInt(u32::try_from(message_size).unwrap()));
}
pub struct Unsubscribe<'a> {
pub topic: &'a str,
pub packet_id: PacketId,
}
pub fn unsubscribe<'a>(buffer: &mut FieldBuffer<'a>, unsubscribe: Unsubscribe<'a>) {
// UNSUBSCRIBE packets have fixed header flags (reserved bits)
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_UNSUBSCRIBE,
protocol::UNSUBSCRIBE_HEADER_FLAGS,
)));
buffer.push(Field::VarInt(0));
// Variable header: packet identifier
buffer.push(Field::U16(unsubscribe.packet_id.into()));
// Payload: topic filter (no QoS)
buffer.push(Field::LenPrefixedString(unsubscribe.topic));
let message_size = field::fields_size(&buffer.as_slice()[2..]);
buffer.set(1, Field::VarInt(u32::try_from(message_size).unwrap()));
}
pub fn disconnect(buffer: &mut FieldBuffer) {
// DISCONNECT has no variable header or payload
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_DISCONNECT,
0,
)));
buffer.push(Field::VarInt(0));
}
pub fn puback(buffer: &mut FieldBuffer, packet_id: PacketId) {
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_PUBACK,
0,
)));
buffer.push(Field::VarInt(2)); // Remaining length is always 2 (packet ID)
buffer.push(Field::U16(packet_id.into()));
}
pub fn pubrec(buffer: &mut FieldBuffer, packet_id: PacketId) {
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_PUBREC,
0,
)));
buffer.push(Field::VarInt(2)); // Remaining length is always 2 (packet ID)
buffer.push(Field::U16(packet_id.into()));
}
pub fn pubrel(buffer: &mut FieldBuffer, packet_id: PacketId) {
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_PUBREL,
protocol::PUBREL_HEADER_FLAGS,
)));
buffer.push(Field::VarInt(2)); // Remaining length is always 2 (packet ID)
buffer.push(Field::U16(packet_id.into()));
}
pub fn pubcomp(buffer: &mut FieldBuffer, packet_id: PacketId) {
buffer.push(Field::U8(protocol::create_header_control(
protocol::PACKET_TYPE_PUBCOMP,
0,
)));
buffer.push(Field::VarInt(2)); // Remaining length is always 2 (packet ID)
buffer.push(Field::U16(packet_id.into()));
}
|
