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use actorcore::{CapabilityConfiguration, HealthCheckResponse};
use log::{info, trace};
use messaging::{BrokerMessage, RequestArgs};
use std::collections::HashMap;
use std::error::Error;
use std::sync::Arc;
use std::sync::RwLock;
use wasmcloud_actor_core as actorcore;
use wasmcloud_actor_messaging as messaging;
use wasmcloud_provider_core::{
capabilities::{CapabilityProvider, Dispatcher, NullDispatcher},
capability_provider,
core::{OP_BIND_ACTOR, OP_HEALTH_REQUEST, OP_REMOVE_ACTOR},
deserialize, serialize,
};
mod natsprov;
#[allow(unused)]
const CAPABILITY_ID: &str = "wasmcloud:messaging";
pub use messaging::OP_HANDLE_MESSAGE;
pub const OP_PUBLISH_MESSAGE: &str = "Publish";
pub const OP_PERFORM_REQUEST: &str = "Request";
#[cfg(not(feature = "static_plugin"))]
capability_provider!(NatsProvider, NatsProvider::new);
#[derive(Clone)]
pub struct NatsProvider {
dispatcher: Arc<RwLock<Box<dyn Dispatcher>>>,
clients: Arc<RwLock<HashMap<String, nats::Connection>>>,
}
impl Default for NatsProvider {
fn default() -> Self {
if env_logger::try_init().is_err() {}
NatsProvider {
dispatcher: Arc::new(RwLock::new(Box::new(NullDispatcher::new()))),
clients: Arc::new(RwLock::new(HashMap::new())),
}
}
}
impl NatsProvider {
pub fn new() -> NatsProvider {
Self::default()
}
fn publish_message(
&self,
actor: &str,
msg: BrokerMessage,
) -> Result<Vec<u8>, Box<dyn Error + Sync + Send>> {
let lock = self.clients.read().unwrap();
let client = lock.get(actor).unwrap();
natsprov::publish(&client, msg)
}
fn request(
&self,
actor: &str,
msg: RequestArgs,
) -> Result<Vec<u8>, Box<dyn Error + Sync + Send>> {
let lock = self.clients.read().unwrap();
let client = lock.get(actor).unwrap();
natsprov::request(&client, msg)
}
fn configure(
&self,
msg: CapabilityConfiguration,
) -> Result<Vec<u8>, Box<dyn Error + Sync + Send>> {
if self.clients.read().unwrap().contains_key(&msg.module) {
return Ok(vec![]);
}
let d = self.dispatcher.clone();
let c = natsprov::initialize_client(d, &msg.module, &msg.values)?;
self.clients.write().unwrap().insert(msg.module, c);
Ok(vec![])
}
fn remove_actor(
&self,
msg: CapabilityConfiguration,
) -> Result<Vec<u8>, Box<dyn Error + Sync + Send>> {
info!("Removing NATS client for actor {}", msg.module);
self.clients.write().unwrap().remove(&msg.module);
Ok(vec![])
}
}
impl CapabilityProvider for NatsProvider {
fn configure_dispatch(
&self,
dispatcher: Box<dyn Dispatcher>,
) -> Result<(), Box<dyn Error + Sync + Send>> {
trace!("Dispatcher received.");
let mut lock = self.dispatcher.write().unwrap();
*lock = dispatcher;
Ok(())
}
fn handle_call(
&self,
actor: &str,
op: &str,
msg: &[u8],
) -> Result<Vec<u8>, Box<dyn Error + Sync + Send>> {
trace!("Received host call from {}, operation - {}", actor, op);
match op {
OP_PUBLISH_MESSAGE => self.publish_message(actor, deserialize(msg)?),
OP_PERFORM_REQUEST => self.request(actor, deserialize(msg)?),
OP_BIND_ACTOR if actor == "system" => self.configure(deserialize(msg)?),
OP_REMOVE_ACTOR if actor == "system" => self.remove_actor(deserialize(msg)?),
OP_HEALTH_REQUEST if actor == "system" => Ok(serialize(HealthCheckResponse {
healthy: true,
message: "".to_string(),
})
.unwrap()),
_ => Err("bad dispatch".into()),
}
}
fn stop(&self) {}
}