pubnub 0.7.0

PubNub SDK for Rust
Documentation 
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// This example blocks so it never finishes.
// You have to stop it manually.

use futures::TryStreamExt;
use pubnub::subscribe::Update;
use pubnub::{Keyset, PubNubClientBuilder};
use serde::Deserialize;
use std::env;

#[derive(Debug, Deserialize)]
struct Message {
    // Allowing dead code because we don't use these fields
    // in this example.
    #[allow(dead_code)]
    url: String,
    #[allow(dead_code)]
    description: String,
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn snafu::Error>> {
    let publish_key = env::var("SDK_PUB_KEY")?;
    let subscribe_key = env::var("SDK_SUB_KEY")?;

    let client = PubNubClientBuilder::with_reqwest_transport()
        .with_keyset(Keyset {
            subscribe_key,
            publish_key: Some(publish_key),
            secret_key: None,
        })
        .with_user_id("user_id")
        .build()?;

    println!("running!");

    client
        .subscribe_raw()
        .channels(["my_channel".into(), "other_channel".into()].to_vec())
        .heartbeat(10)
        .filter_expression("some_filter")
        .execute()?
        .stream()
        .try_for_each(|update| async move {
            match update {
                Update::Message(message) | Update::Signal(message) => {
                    // Deserialize the message payload as you wish
                    match serde_json::from_slice::<Message>(&message.data) {
                        Ok(message) => println!("defined message: {:?}", message),
                        Err(_) => {
                            println!("other message: {:?}", String::from_utf8(message.data))
                        }
                    }
                }
                Update::Presence(presence) => {
                    println!("presence: {:?}", presence)
                }
                Update::AppContext(object) => {
                    println!("object: {:?}", object)
                }
                Update::MessageAction(action) => {
                    println!("message action: {:?}", action)
                }
                Update::File(file) => {
                    println!("file: {:?}", file)
                }
            }

            Ok(())
        })
        .await?;

    // Now you can send messages to the channels
    // "my_channel" and "other_channel" and see them printed in the console.
    // You can use the publish example or [PubNub console](https://www.pubnub.com/docs/console/)
    // to send messages.

    Ok(())
}