Server abstraction aggregating underlying modules (p2p, chain, etc.). Beginning of a test to start multiple servers, connect them and mine.

grin/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "grin"
+name = "grin_grin"
 version = "0.1.0"
 authors = ["Ignotus Peverell <igno.peverell@protonmail.com>"]
 
@@ -7,9 +7,11 @@ authors = ["Ignotus Peverell <igno.peverell@protonmail.com>"]
 grin_chain = { path = "../chain" }
 grin_core = { path = "../core" }
 grin_store = { path = "../store" }
+grin_p2p = { path = "../p2p" }
 secp256k1zkp = { path = "../secp256k1zkp" }
 
 env_logger="^0.3.5"
 log = "^0.3"
+mioco = "^0.8"
 time = "^0.1"
 rand = "^0.3"

grin/src/lib.rs

@@ -24,26 +24,17 @@
 #[macro_use]
 extern crate log;
 extern crate env_logger;
+extern crate mioco;
 extern crate rand;
 extern crate time;
 
 extern crate grin_chain as chain;
 extern crate grin_core as core;
+extern crate grin_p2p as p2p;
 extern crate grin_store as store;
 extern crate secp256k1zkp as secp;
 
 mod miner;
+mod server;
 
-use store::Store;
-use core::genesis::genesis;
-
-fn main() {
-	env_logger::init().unwrap();
-
-	let gen = genesis();
-	let db = Store::open("./store").unwrap();
-	let mut key = "block:".to_string().into_bytes();
-	let mut hash_vec = gen.hash().to_vec();
-	key.append(&mut hash_vec);
-	db.put_ser(&key[..], &gen);
-}
+pub use server::{Server, ServerConfig};

grin/src/miner.rs

@@ -29,18 +29,18 @@ use chain;
 use secp;
 
 pub struct Miner {
-	chain_state: Arc<Mutex<chain::State>>,
+	chain_head: Arc<Mutex<chain::Tip>>,
 	chain_store: Arc<Mutex<chain::ChainStore>>,
 }
 
 impl Miner {
 	/// Creates a new Miner. Needs references to the chain state and its
 	/// storage.
-	pub fn new(chain_state: Arc<Mutex<chain::State>>,
+	pub fn new(chain_head: Arc<Mutex<chain::Tip>>,
 	           chain_store: Arc<Mutex<chain::ChainStore>>)
 	           -> Miner {
 		Miner {
-			chain_state: chain_state,
+			chain_head: chain_head,
 			chain_store: chain_store,
 		}
 	}
@@ -48,13 +48,14 @@ impl Miner {
 	/// Starts the mining loop, building a new block on top of the existing
 	/// chain anytime required and looking for PoW solution.
 	pub fn run_loop(&self) {
+    info!("Starting miner loop.");
 		loop {
 			// get the latest chain state and build a block on top of it
 			let head: core::BlockHeader;
 			let mut latest_hash: Hash;
 			{
 				head = self.chain_store.lock().unwrap().head_header().unwrap();
-				latest_hash = self.chain_state.lock().unwrap().head.last_block_h;
+				latest_hash = self.chain_head.lock().unwrap().last_block_h;
 			}
 			let b = self.build_block(&head);
 			let mut pow_header = pow::PowHeader::from_block(&b);
@@ -63,6 +64,7 @@ impl Miner {
 			// transactions) and as long as the head hasn't changed
 			let deadline = time::get_time().sec + 2;
 			let mut sol = None;
+      debug!("Mining at Cuckoo{} for at most 2 secs.", b.header.cuckoo_len);
 			while head.hash() == latest_hash && time::get_time().sec < deadline {
 				let pow_hash = pow_header.hash();
 				let mut miner = cuckoo::Miner::new(pow_hash.to_slice(),
@@ -76,17 +78,20 @@ impl Miner {
 				}
 				pow_header.nonce += 1;
 				{
-					latest_hash = self.chain_state.lock().unwrap().head.last_block_h;
+					latest_hash = self.chain_head.lock().unwrap().last_block_h;
 				}
 			}
 
 			// if we found a solution, push our block out
 			if let Some(proof) = sol {
+        info!("Found valid proof of work, adding block {}.", b.hash());
 				if let Err(e) = chain::process_block(&b,
 				                                     self.chain_store.lock().unwrap().deref(),
 				                                     chain::NONE) {
 					error!("Error validating mined block: {:?}", e);
 				}
+			} else {
+        debug!("No solution found, continuing...")
       }
 		}
 	}

grin/src/server.rs

@@ -0,0 +1,120 @@
+// Copyright 2016 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Grin server implementation, glues the different parts of the system (mostly the peer-to-peer server, the blockchain and the transaction pool) and acts as a facade.
+
+use mioco;
+use std::io;
+use std::net::ToSocketAddrs;
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+use chain;
+use chain::ChainStore;
+use core;
+use miner;
+use p2p;
+
+/// Errors than can be reported by a server implementation, mostly wraps underlying components errors.
+#[derive(Debug)]
+pub enum Error {
+  /// Error when trying to add a block to the chain
+  ChainErr(chain::pipe::Error),
+  /// Peer connection error
+  PeerErr(core::ser::Error),
+  /// Data store error
+	StoreErr(chain::types::Error),
+}
+
+/// Full server configuration, aggregating configurations required for the different components.
+#[derive(Debug, Clone)]
+pub struct ServerConfig {
+  /// Directory under which the rocksdb stores will be created
+  pub db_root: String,
+  /// Allows overriding the default cuckoo cycle size
+  pub cuckoo_size: u8,
+  /// Configuration for the peer-to-peer server
+  pub p2p_config: p2p::P2PConfig,
+}
+
+impl Default for ServerConfig {
+  fn default() -> ServerConfig {
+    ServerConfig{
+      db_root: ".grin".to_string(),
+      cuckoo_size: 0,
+      p2p_config: p2p::P2PConfig::default(),
+    }
+  }
+}
+
+/// Grin server holding internal structures.
+pub struct Server {
+  config: ServerConfig,
+  /// handle to our network server
+  p2p: Arc<p2p::Server>,
+  /// the reference copy of the current chain state
+  chain_head: Arc<Mutex<chain::Tip>>,
+  /// data store access
+  chain_store: Arc<Mutex<chain::ChainStore>>,
+}
+
+impl Server {
+  /// Instantiates and starts a new server.
+  pub fn start(config: ServerConfig) -> Result<Server, Error> {
+    let chain_store = try!(chain::store::ChainKVStore::new(config.db_root.clone()).map_err(&Error::StoreErr));
+
+    // check if we have a head in store, otherwise the genesis block is it
+    let head = match chain_store.head() {
+      Ok(tip) => tip,
+      Err(chain::types::Error::NotFoundErr) => {
+        let mut gen = core::genesis::genesis();
+        if config.cuckoo_size > 0 {
+          gen.header.cuckoo_len = config.cuckoo_size;
+        }
+        let tip = chain::types::Tip::new(gen.hash());
+        try!(chain_store.save_tip(&tip).map_err(&Error::StoreErr));
+        tip
+      },
+      Err(e) => return Err(Error::StoreErr(e)),
+    };
+
+    let server = Arc::new(p2p::Server::new(config.p2p_config));
+    let in_server = server.clone();
+		mioco::spawn(move || -> io::Result<()> {
+      try!(in_server.start().map_err(|_| io::Error::last_os_error()));
+			Ok(())
+		});
+
+		warn!("Grin server started.");
+    Ok(Server{
+      config: config,
+      p2p: server,
+      chain_head: Arc::new(Mutex::new(head)),
+      chain_store: Arc::new(Mutex::new(chain_store)),
+    })
+  }
+
+  /// Asks the server to connect to a peer at the provided network address.
+  pub fn connect_peer<A: ToSocketAddrs>(&self, addr: A) -> Result<(), Error> {
+    self.p2p.connect_peer(addr).map_err(&Error::PeerErr)
+  }
+
+  /// Start mining for blocks on a separate thread. Relies on a toy miner, mostly for testing.
+  pub fn start_miner(&self) {
+    let miner = miner::Miner::new(self.chain_head.clone(), self.chain_store.clone());
+    thread::spawn(move || {
+      miner.run_loop();
+    });
+  }
+}

grin/tests/simulnet.rs

@@ -0,0 +1,57 @@
+// Copyright 2016 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate grin_grin as grin;
+extern crate grin_core as core;
+extern crate grin_p2p as p2p;
+extern crate grin_chain as chain;
+extern crate mioco;
+extern crate env_logger;
+
+use std::io;
+use std::time;
+
+#[test]
+fn simulate_servers() {
+  env_logger::init().unwrap();
+
+  mioco::start(move || -> io::Result<()> {
+    // instantiates 5 servers on different ports
+    let mut servers = vec![];
+    for n in 0..5 {
+      let s = grin::Server::start(
+          grin::ServerConfig{
+            db_root: format!("target/grin-{}", n),
+            cuckoo_size: 18,
+            p2p_config: p2p::P2PConfig{port: 10000+n, ..p2p::P2PConfig::default()}
+          }).unwrap();
+      servers.push(s);
+    }
+
+    mioco::sleep(time::Duration::from_millis(100));
+
+    // everyone connects to everyone else
+    for n in 0..5 {
+      for m in 0..5 {
+        if m == n { continue }
+        let addr = format!("{}:{}", "127.0.0.1", 10000+m);
+        servers[n].connect_peer(addr.as_str()).unwrap();
+        mioco::sleep(time::Duration::from_millis(100));
+        println!("c {}", m);
+      }
+    }
+    Ok(())
+  });
+
+}