guac 0.3.1

A library that provides toolkit for working with [Guac](https://guac.sh) from Rust.
Documentation 
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use async_nats::{Client, Subject};
use async_trait::async_trait;
use serde_json::json;

use super::Document;

const SUBJECT_COLLECTED: &str = "DOCUMENTS.collected";

#[async_trait]
pub trait Emitter {
    async fn send(&self, subject: &str, data: Vec<u8>) -> Result<(), anyhow::Error>;

    async fn publish(&self, document: Document) -> Result<(), anyhow::Error> {
        let bytes = serde_json::to_vec(&json!(document))?;

        self.send(SUBJECT_COLLECTED, bytes).await
    }
}

pub struct NatsEmitter {
    client: Client,
}

impl NatsEmitter {
    pub async fn new(url: &str) -> Result<Self, anyhow::Error> {
        let client = async_nats::ConnectOptions::new()
            .retry_on_initial_connect()
            .connect(url)
            .await?;
        Ok(Self { client })
    }
}

#[async_trait]
impl Emitter for NatsEmitter {
    async fn send(&self, subject: &str, data: Vec<u8>) -> Result<(), anyhow::Error> {
        let sub = Subject::from(subject);
        self.client
            .publish(sub, data.into())
            .await
            .map_err(|e| anyhow::anyhow!(e))?;
        self.client.flush().await.map_err(|e| anyhow::anyhow!(e))
    }
}