Crate lapin_async

lapin-async

this library is meant for use in an event loop. The library exposes, through the Connection struct, a state machine you can drive through IO you manage.

Typically, your code would own the socket and buffers, and regularly pass the input and output buffers to the state machine so it receives messages and serializes new ones to send. You can then query the current state and see if it received new messages for the consumers.

Example

use env_logger;
use lapin_async as lapin;
use log::info;

use crate::lapin::{
  BasicProperties, Channel, Connection, ConnectionProperties, ConsumerSubscriber, Credentials,
  message::Delivery,
  options::*,
  types::FieldTable,
};

#[derive(Clone,Debug)]
struct Subscriber {
  channel: Channel,
}

impl ConsumerSubscriber for Subscriber {
  fn new_delivery(&self, delivery: Delivery) {
    self.channel.basic_ack(delivery.delivery_tag, BasicAckOptions::default()).into_result().expect("basic_ack");
  }
  fn drop_prefetched_messages(&self) {}
  fn cancel(&self) {}
}

fn main() {
  env_logger::init();

  let addr = std::env::var("AMQP_ADDR").unwrap_or_else(|_| "amqp://127.0.0.1:5672/%2f".into());
  let conn = Connection::connect(&addr, Credentials::default(), ConnectionProperties::default()).wait().expect("connection error");

  info!("CONNECTED");

  let channel_a = conn.create_channel().wait().expect("create_channel");
  let channel_b = conn.create_channel().wait().expect("create_channel");

  channel_a.queue_declare("hello", QueueDeclareOptions::default(), FieldTable::default()).wait().expect("queue_declare");
  let queue = channel_b.queue_declare("hello", QueueDeclareOptions::default(), FieldTable::default()).wait().expect("queue_declare");

  info!("will consume");
  channel_b.basic_consume(&queue, "my_consumer", BasicConsumeOptions::default(), FieldTable::default(), Box::new(Subscriber { channel: channel_b.clone() })).wait().expect("basic_consume");

  let payload = b"Hello world!";

  loop {
    channel_a.basic_publish("", "hello", BasicPublishOptions::default(), payload.to_vec(), BasicProperties::default()).wait().expect("basic_publish");
  }
}

Modules

confirmation
message
options
protocol	The AMQ Protocol implementation (Generated)
tcp	Reexport of amq_protocol_tcp
types	Reexport of amq_protocol_types
uri	Reexport of amq_protocol_uri

Structs

Channel
ChannelStatus
Configuration
Connection
ConnectionProperties
ConnectionStatus
Credentials
Error	The type of error that can be returned in this crate.
Queue

Enums

ChannelState
ConnectionSASLMechanism
ConnectionState
ErrorKind	The different kinds of errors that can be reported.

Traits

Connect	Trait providing a method to connect to an AMQP server
ConsumerSubscriber

Type Definitions

BasicProperties

Type alias for AMQP BasicProperties