Add Job Declarator Client struct

With the goal to write more tests, this commit moves JDC initialisation
logic from `main.rs` to `lib.rs` so its easier to test and also separate
the actual `lib` code from the binary.

roles/jd-client/src/lib/mod.rs

@@ -8,6 +8,22 @@ pub mod upstream_sv2;
 
 use std::{sync::atomic::AtomicBool, time::Duration};
 
+use job_declarator::JobDeclarator;
+use proxy_config::ProxyConfig;
+use template_receiver::TemplateRx;
+
+use async_channel::{bounded, unbounded};
+use futures::{select, FutureExt};
+use roles_logic_sv2::utils::Mutex;
+use std::{
+    net::{IpAddr, SocketAddr},
+    str::FromStr,
+    sync::Arc,
+};
+use tokio::task::AbortHandle;
+
+use tracing::{error, info};
+
 /// Is used by the template receiver and the downstream. When a NewTemplate is received the context
 /// that is running the template receiver set this value to false and then the message is sent to
 /// the context that is running the Downstream that do something and then set it back to true.
@@ -31,6 +47,307 @@ use std::{sync::atomic::AtomicBool, time::Duration};
 ///    between all the contexts is not necessary.
 pub static IS_NEW_TEMPLATE_HANDLED: AtomicBool = AtomicBool::new(true);
 
+/// Job Declarator Client (or JDC) is the role which is Miner-side, in charge of creating new
+/// mining jobs from the templates received by the Template Provider to which it is connected. It
+/// declares custom jobs to the JDS, in order to start working on them.
+/// JDC is also responsible for putting in action the Pool-fallback mechanism, automatically
+/// switching to backup Pools in case of declared custom jobs refused by JDS (which is Pool side).
+/// As a solution of last-resort, it is able to switch to Solo Mining until new safe Pools appear
+/// in the market.
+pub struct JobDeclaratorClient {
+    /// Configuration of the proxy server [`JobDeclaratorClient`] is connected to.
+    config: ProxyConfig,
+}
+
+impl JobDeclaratorClient {
+    pub fn new(config: ProxyConfig) -> Self {
+        Self { config }
+    }
+
+    pub async fn start(self) {
+        let mut upstream_index = 0;
+        let mut interrupt_signal_future = Box::pin(tokio::signal::ctrl_c().fuse());
+
+        // Channel used to manage failed tasks
+        let (tx_status, rx_status) = unbounded();
+
+        let task_collector = Arc::new(Mutex::new(vec![]));
+
+        let proxy_config = &self.config;
+
+        loop {
+            let task_collector = task_collector.clone();
+            let tx_status = tx_status.clone();
+            if let Some(upstream) = proxy_config.upstreams.get(upstream_index) {
+                self.initialize_jd(tx_status.clone(), task_collector.clone(), upstream.clone())
+                    .await;
+            } else {
+                self.initialize_jd_as_solo_miner(tx_status.clone(), task_collector.clone())
+                    .await;
+            }
+            // Check all tasks if is_finished() is true, if so exit
+            loop {
+                let task_status = select! {
+                    task_status = rx_status.recv().fuse() => task_status,
+                    interrupt_signal = interrupt_signal_future => {
+                        match interrupt_signal {
+                            Ok(()) => {
+                                info!("Interrupt received");
+                            },
+                            Err(err) => {
+                                error!("Unable to listen for interrupt signal: {}", err);
+                                // we also shut down in case of error
+                            },
+                        }
+                        std::process::exit(0);
+                    }
+                };
+                let task_status: status::Status = task_status.unwrap();
+
+                match task_status.state {
+                    // Should only be sent by the downstream listener
+                    status::State::DownstreamShutdown(err) => {
+                        error!("SHUTDOWN from: {}", err);
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        task_collector
+                            .safe_lock(|s| {
+                                for handle in s {
+                                    handle.abort();
+                                }
+                            })
+                            .unwrap();
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        break;
+                    }
+                    status::State::UpstreamShutdown(err) => {
+                        error!("SHUTDOWN from: {}", err);
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        task_collector
+                            .safe_lock(|s| {
+                                for handle in s {
+                                    handle.abort();
+                                }
+                            })
+                            .unwrap();
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        break;
+                    }
+                    status::State::UpstreamRogue => {
+                        error!("Changin Pool");
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        task_collector
+                            .safe_lock(|s| {
+                                for handle in s {
+                                    handle.abort();
+                                }
+                            })
+                            .unwrap();
+                        upstream_index += 1;
+                        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+                        break;
+                    }
+                    status::State::Healthy(msg) => {
+                        info!("HEALTHY message: {}", msg);
+                    }
+                }
+            }
+        }
+    }
+
+    async fn initialize_jd_as_solo_miner(
+        &self,
+        tx_status: async_channel::Sender<status::Status<'static>>,
+        task_collector: Arc<Mutex<Vec<AbortHandle>>>,
+    ) {
+        let proxy_config = &self.config;
+        let timeout = proxy_config.timeout;
+        let miner_tx_out = proxy_config::get_coinbase_output(proxy_config).unwrap();
+
+        // When Downstream receive a share that meets bitcoin target it transformit in a
+        // SubmitSolution and send it to the TemplateReceiver
+        let (send_solution, recv_solution) = bounded(10);
+
+        // Format `Downstream` connection address
+        let downstream_addr = SocketAddr::new(
+            IpAddr::from_str(&proxy_config.downstream_address).unwrap(),
+            proxy_config.downstream_port,
+        );
+
+        // Wait for downstream to connect
+        let downstream = downstream::listen_for_downstream_mining(
+            downstream_addr,
+            None,
+            send_solution,
+            proxy_config.withhold,
+            proxy_config.authority_public_key,
+            proxy_config.authority_secret_key,
+            proxy_config.cert_validity_sec,
+            task_collector.clone(),
+            status::Sender::Downstream(tx_status.clone()),
+            miner_tx_out.clone(),
+            None,
+        )
+        .await
+        .unwrap();
+
+        // Initialize JD part
+        let mut parts = proxy_config.tp_address.split(':');
+        let ip_tp = parts.next().unwrap().to_string();
+        let port_tp = parts.next().unwrap().parse::<u16>().unwrap();
+
+        TemplateRx::connect(
+            SocketAddr::new(IpAddr::from_str(ip_tp.as_str()).unwrap(), port_tp),
+            recv_solution,
+            status::Sender::TemplateReceiver(tx_status.clone()),
+            None,
+            downstream,
+            task_collector,
+            Arc::new(Mutex::new(PoolChangerTrigger::new(timeout))),
+            miner_tx_out.clone(),
+            proxy_config.tp_authority_public_key,
+            false,
+        )
+        .await;
+    }
+
+    async fn initialize_jd(
+        &self,
+        tx_status: async_channel::Sender<status::Status<'static>>,
+        task_collector: Arc<Mutex<Vec<AbortHandle>>>,
+        upstream_config: proxy_config::Upstream,
+    ) {
+        let proxy_config = &self.config;
+        let timeout = proxy_config.timeout;
+        let test_only_do_not_send_solution_to_tp = proxy_config
+            .test_only_do_not_send_solution_to_tp
+            .unwrap_or(false);
+
+        // Format `Upstream` connection address
+        let mut parts = upstream_config.pool_address.split(':');
+        let address = parts
+            .next()
+            .unwrap_or_else(|| panic!("Invalid pool address {}", upstream_config.pool_address));
+        let port = parts
+            .next()
+            .and_then(|p| p.parse::<u16>().ok())
+            .unwrap_or_else(|| panic!("Invalid pool address {}", upstream_config.pool_address));
+        let upstream_addr = SocketAddr::new(
+            IpAddr::from_str(address).unwrap_or_else(|_| {
+                panic!("Invalid pool address {}", upstream_config.pool_address)
+            }),
+            port,
+        );
+
+        // When Downstream receive a share that meets bitcoin target it transformit in a
+        // SubmitSolution and send it to the TemplateReceiver
+        let (send_solution, recv_solution) = bounded(10);
+
+        // Instantiate a new `Upstream` (SV2 Pool)
+        let upstream = match upstream_sv2::Upstream::new(
+            upstream_addr,
+            upstream_config.authority_pubkey,
+            0, // TODO
+            upstream_config.pool_signature.clone(),
+            status::Sender::Upstream(tx_status.clone()),
+            task_collector.clone(),
+            Arc::new(Mutex::new(PoolChangerTrigger::new(timeout))),
+        )
+        .await
+        {
+            Ok(upstream) => upstream,
+            Err(e) => {
+                error!("Failed to create upstream: {}", e);
+                panic!()
+            }
+        };
+
+        // Start receiving messages from the SV2 Upstream role
+        if let Err(e) = upstream_sv2::Upstream::parse_incoming(upstream.clone()) {
+            error!("failed to create sv2 parser: {}", e);
+            panic!()
+        }
+
+        match upstream_sv2::Upstream::setup_connection(
+            upstream.clone(),
+            proxy_config.min_supported_version,
+            proxy_config.max_supported_version,
+        )
+        .await
+        {
+            Ok(_) => info!("Connected to Upstream!"),
+            Err(e) => {
+                error!("Failed to connect to Upstream EXITING! : {}", e);
+                panic!()
+            }
+        }
+
+        // Format `Downstream` connection address
+        let downstream_addr = SocketAddr::new(
+            IpAddr::from_str(&proxy_config.downstream_address).unwrap(),
+            proxy_config.downstream_port,
+        );
+
+        // Initialize JD part
+        let mut parts = proxy_config.tp_address.split(':');
+        let ip_tp = parts.next().unwrap().to_string();
+        let port_tp = parts.next().unwrap().parse::<u16>().unwrap();
+
+        let mut parts = upstream_config.jd_address.split(':');
+        let ip_jd = parts.next().unwrap().to_string();
+        let port_jd = parts.next().unwrap().parse::<u16>().unwrap();
+        let jd = match JobDeclarator::new(
+            SocketAddr::new(IpAddr::from_str(ip_jd.as_str()).unwrap(), port_jd),
+            upstream_config.authority_pubkey.into_bytes(),
+            proxy_config.clone(),
+            upstream.clone(),
+            task_collector.clone(),
+        )
+        .await
+        {
+            Ok(c) => c,
+            Err(e) => {
+                let _ = tx_status
+                    .send(status::Status {
+                        state: status::State::UpstreamShutdown(e),
+                    })
+                    .await;
+                return;
+            }
+        };
+
+        // Wait for downstream to connect
+        let downstream = downstream::listen_for_downstream_mining(
+            downstream_addr,
+            Some(upstream),
+            send_solution,
+            proxy_config.withhold,
+            proxy_config.authority_public_key,
+            proxy_config.authority_secret_key,
+            proxy_config.cert_validity_sec,
+            task_collector.clone(),
+            status::Sender::Downstream(tx_status.clone()),
+            vec![],
+            Some(jd.clone()),
+        )
+        .await
+        .unwrap();
+
+        TemplateRx::connect(
+            SocketAddr::new(IpAddr::from_str(ip_tp.as_str()).unwrap(), port_tp),
+            recv_solution,
+            status::Sender::TemplateReceiver(tx_status.clone()),
+            Some(jd.clone()),
+            downstream,
+            task_collector,
+            Arc::new(Mutex::new(PoolChangerTrigger::new(timeout))),
+            vec![],
+            proxy_config.tp_authority_public_key,
+            test_only_do_not_send_solution_to_tp,
+        )
+        .await;
+    }
+}
+
 #[derive(Debug)]
 pub struct PoolChangerTrigger {
     timeout: Duration,