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use std::io;
pub mod listener;
pub mod message;
pub mod publisher;
mod utils;
use crate::listener::EventBusListener;
use crate::publisher::EventBusPublisher;
use std::net::{TcpStream, ToSocketAddrs};
pub fn eventbus<A: ToSocketAddrs>(address: A) -> io::Result<(EventBusPublisher, EventBusListener)> {
let socket = TcpStream::connect(&address)?;
socket.set_nonblocking(true)?;
let control_socket = socket
.try_clone()?;
let w_socket = socket
.try_clone()?;
Ok((
EventBusPublisher::new(w_socket)?,
EventBusListener::new(control_socket)?,
))
}
#[cfg(test)]
mod tests {
use crate::eventbus;
use crate::message::{Message, SendMessage};
use serde_json::json;
use testcontainers::images::generic::{GenericImage, WaitFor};
use testcontainers::*;
fn mock_eventbus_server() -> GenericImage {
GenericImage::new("aesteve/tests:mock-eventbus-server")
.with_wait_for(WaitFor::message_on_stdout("TCP bridge connected"))
}
#[test]
fn test_ping() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (mut publisher, _) = eventbus(addr).expect("Event bus creation must not fail");
publisher
.ping()
.expect("Should be able to send ping to the server");
}
#[test]
fn consumer_test() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (_, mut listener) = eventbus(addr).expect("Event bus creation must not fail");
let mut consumer = listener.consumer("out-address".to_string()).unwrap();
let mut received_msgs = Vec::new();
while received_msgs.len() < 3 {
if let Some(Ok(msg)) = consumer.next() {
assert!(received_msgs
.iter()
.find(|m: &&Message| m.body == msg.body)
.is_none());
received_msgs.push(msg);
}
}
listener
.unregister_consumer("out-address".to_string())
.expect("Unregistering consumer must not fail");
}
#[test]
fn send_reply_pattern() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (mut publisher, mut listener) =
eventbus(addr).expect("Event bus creation must not fail");
let reply_address = "the-reply-address";
let mut consumer = listener.consumer(reply_address.to_string()).unwrap();
let payload = json!({"test": "value"});
let expected_payload = payload.clone();
publisher
.send(SendMessage {
address: "echo-address".to_string(),
reply_address: Some(reply_address.to_string()),
body: Some(payload),
headers: None,
})
.expect("Sending a message to the event bus must work fine");
let mut received_msgs = 0;
while received_msgs == 0 {
if let Some(Ok(msg)) = consumer.next() {
assert_eq!(reply_address, msg.address);
assert_eq!(
expected_payload,
msg.body.expect("Body should be extracted")
);
received_msgs += 1;
}
}
}
#[test]
fn pub_sub_pattern() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (mut publisher, _) = eventbus(addr).expect("Event bus creation must not fail");
let payload = json!({"test": "value"});
publisher
.publish(Message {
address: "in-address".to_string(),
body: Some(payload),
headers: None,
})
.expect("Publishing a message to the event bus must work fine");
}
#[test]
fn test_errors() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (mut publisher, mut listener) =
eventbus(addr).expect("Event bus creation must not fail");
let payload = json!({"test": "value"});
publisher
.send(SendMessage {
address: "error-address".to_string(),
reply_address: Some("the-reply-address".to_string()),
body: Some(payload),
headers: None,
})
.expect("Publishing a message to the event bus must work fine");
let mut errors_received = 0;
let mut errors = listener.errors().expect("Can listen to errors");
while errors_received == 0 {
if let Some(Ok(error_msg)) = errors.next() {
assert_eq!(error_msg.message, "FORBIDDEN".to_string(),);
errors_received += 1;
}
}
}
#[test]
fn connect_to_an_unexisting_address_should_fail() {
let eb = eventbus("127.0.0.1::1111");
assert!(eb.is_err());
}
#[test]
fn should_be_notified_of_errors() {
let docker = clients::Cli::default();
let node = docker.run(mock_eventbus_server());
let host_port = node
.get_host_port(7542)
.expect("Mock event bus server implementation needs to be up before running tests");
let addr = format!("localhost:{}", host_port);
println!("Mock server running on {}", addr);
let (_, mut listener) = eventbus(addr).expect("Event bus creation must not fail");
let mut error_listener = listener
.errors()
.expect("Can ask for an iterator over error messages");
listener
.consumer("something_we_dont_have_access_to".to_string())
.expect("Can subscribe to any address");
let mut errors_received = 0;
while errors_received < 1 {
if let Some(Ok(error_msg)) = error_listener.next() {
errors_received += 1;
assert!(error_msg.message.contains("denied"))
}
}
}
}