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main.rs
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main.rs
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use clap::{App, Arg};
use std::process;
use futures::executor::block_on;
use paho_mqtt as mqtt;
use tokio::time::Duration;
use serde_json::json;
use std::option::Option::Some;
use tokio::stream::StreamExt;
use cloudevents::{EventBuilderV10, EventBuilder};
use cloudevents_sdk_mqtt::{MessageRecord, MessageBuilderExt, MqttVersion, MessageExt};
fn consume_v3(broker: &str, topic_name: &str) {
let create_opts = mqtt::CreateOptionsBuilder::new()
.server_uri(broker)
.client_id("rust_async_consumer")
.finalize();
let mut cli = mqtt::AsyncClient::new(create_opts).unwrap_or_else(|e| {
println!("Error creating the client: {:?}", e);
process::exit(1);
});
if let Err(err) = block_on(async {
let mut strm = cli.get_stream(25);
let conn_opts = mqtt::ConnectOptionsBuilder::new()
.keep_alive_interval(Duration::from_secs(20))
.clean_session(false)
.finalize();
println!("Connecting to the MQTT server...");
cli.connect(conn_opts).await?;
println!("Subscribing to topics: {:?}", topic_name);
cli.subscribe(topic_name, 1).await?;
println!("Waiting for messages...");
while let Some(msg_opt) = strm.next().await {
if let Some(msg) = msg_opt {
let event = msg.to_event().unwrap();
println!("Received Event: {:#?}", event);
}
else {
// A "None" means we were disconnected. Try to reconnect...
println!("Lost connection. Attempting reconnect.");
while let Err(_err) = cli.reconnect().await {
// For tokio use: tokio::time::delay_for()
tokio::time::delay_for(Duration::from_millis(1000)).await;
}
}
}
Ok::<(), mqtt::Error>(())
}) {
eprintln!("{}", err);
}
}
fn consume_v5(broker: &str, topic_name: &str) {
let create_opts = mqtt::CreateOptionsBuilder::new()
.server_uri(broker)
.client_id("rust_async_consumer")
.mqtt_version(5)
.finalize();
let mut cli = mqtt::AsyncClient::new(create_opts).unwrap_or_else(|e| {
println!("Error creating the client: {:?}", e);
process::exit(1);
});
if let Err(err) = block_on(async {
let mut strm = cli.get_stream(25);
let conn_opts = mqtt::ConnectOptionsBuilder::new()
.keep_alive_interval(Duration::from_secs(20))
.clean_session(false)
.mqtt_version(5)
.finalize();
println!("Connecting to the MQTT server...");
cli.connect(conn_opts).await?;
println!("Subscribing to topics: {:?}", topic_name);
cli.subscribe(topic_name, 1).await?;
println!("Waiting for messages...");
while let Some(msg_opt) = strm.next().await {
if let Some(msg) = msg_opt {
let event = msg.to_event().unwrap();
println!("Received Event: {:#?}", event);
}
else {
// A "None" means we were disconnected. Try to reconnect...
println!("Lost connection. Attempting reconnect.");
while let Err(_err) = cli.reconnect().await {
// For tokio use: tokio::time::delay_for()
tokio::time::delay_for(Duration::from_millis(1000)).await;
}
}
}
Ok::<(), mqtt::Error>(())
}) {
eprintln!("{}", err);
}
}
fn produce_v3(broker: &str, topic_name: &str) {
env_logger::init();
let create_opts = mqtt::CreateOptionsBuilder::new()
.server_uri(broker)
.finalize();
let cli = mqtt::AsyncClient::new(create_opts).unwrap_or_else(|_err| {
process::exit(1);
});
if let Err(err) = block_on(async {
let conn_opts = mqtt::ConnectOptions::new();
cli.connect(conn_opts).await?;
println!("Publishing a message on the topic");
let event = EventBuilderV10::new()
.id("1".to_string())
.ty("example.test")
.source("http://localhost/")
.data("application/cloudevents+json", json!({"hello": "world"}))
.build()
.unwrap();
let message_record =
MessageRecord::from_event(event).expect("error while serializing the event");
// Create a message and publish it
let msg = mqtt::MessageBuilder::new()
.topic(topic_name)
.message_record(&message_record)
.qos(1)
.finalize();
cli.publish(msg).await?;
cli.disconnect(None).await?;
Ok::<(), mqtt::Error>(())
}) {
eprintln!("{}", err);
}
}
fn produce_v5(broker: &str, topic_name: &str) {
env_logger::init();
let create_opts = mqtt::CreateOptionsBuilder::new()
.server_uri(broker)
.mqtt_version(5)
.finalize();
let cli = mqtt::AsyncClient::new(create_opts).unwrap_or_else(|_err| {
process::exit(1);
});
if let Err(err) = block_on(async {
let conn_opts = mqtt::ConnectOptionsBuilder::new()
.mqtt_version(5)
.finalize();
cli.connect(conn_opts).await?;
println!("Publishing a message on the topic");
let event = EventBuilderV10::new()
.id("1".to_string())
.ty("example.test")
.source("http://localhost/")
.data("application/json", json!({"hello": "world"}))
.build()
.unwrap();
let message_record =
MessageRecord::from_event(event).expect("error while serializing the event");
// Create a message and publish it
let msg = mqtt::MessageBuilder::new()
.topic(topic_name)
.message_record(&message_record)
.qos(1)
.finalize();
cli.publish(msg).await?;
cli.disconnect(None).await?;
Ok::<(), mqtt::Error>(())
}) {
eprintln!("{}", err);
}
}
fn main() {
let selector = App::new("CloudEvents Mqtt Example")
.version(option_env!("CARGO_PKG_VERSION").unwrap_or(""))
.about("select consumer or producer")
.arg(
Arg::with_name("mode")
.long("mode")
.help("enter \"consmer\" or \"producer\"")
.takes_value(true)
.possible_values(&["consumerV3", "producerV3", "consumerV5", "producerV5"])
.required(true),
)
.arg(
Arg::with_name("topic")
.long("topic")
.help("Mqtt topic")
.takes_value(true)
.required(true),
)
.arg(
Arg::with_name("broker")
.short("b")
.long("broker")
.help("Broker list in mqtt format")
.takes_value(true)
.default_value("tcp://localhost:1883"),
)
.get_matches();
match selector.value_of("mode").unwrap() {
"producerV3" => {
produce_v3(
selector.value_of("broker").unwrap(),
selector.value_of("topic").unwrap(),
)
}
"consumerV3" => {
consume_v3(
selector.value_of("broker").unwrap(),
selector.value_of("topic").unwrap(),
)
}
"producerV5" => {
produce_v5(
selector.value_of("broker").unwrap(),
selector.value_of("topic").unwrap(),
)
}
"consumerV5" => {
consume_v5(
selector.value_of("broker").unwrap(),
selector.value_of("topic").unwrap(),
)
}
_ => (),
}
}