Refactor; ability to update network config

7 files changed, 377 insertions, 174 deletions

diff --git a/src/api.rs b/src/api_server.rs
index cf70dbdf..cf70dbdf 100644
--- a/src/api.rs
+++ b/src/api_server.rs
diff --git a/src/main.rs b/src/main.rs
index 05b0a73a..922e873e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,119 +2,163 @@ mod error;
 mod data;
 mod proto;
 mod membership;
-mod rpc;
-mod api;
+mod server;
+mod rpc_server;
+mod rpc_client;
+mod api_server;
 
-use std::io::{Read, Write};
-use std::sync::Arc;
+use std::collections::HashSet;
 use std::net::SocketAddr;
 use std::path::PathBuf;
 use structopt::StructOpt;
-use futures::channel::oneshot;
-use serde::Deserialize;
-use rand::Rng;
 
-use data::UUID;
 use error::Error;
-use membership::System;
+use rpc_client::RpcClient;
+use data::*;
+use proto::*;
 
 #[derive(StructOpt, Debug)]
 #[structopt(name = "garage")]
 pub struct Opt {
-	#[structopt(short = "c", long = "config", default_value = "./config.toml")]
-	config_file: PathBuf,
-}
-
-#[derive(Deserialize, Debug)]
-pub struct Config {
-	datacenter: String,
-
-	metadata_dir: PathBuf,
-	data_dir: PathBuf,
+	/// RPC connect to this host to execute client operations
+	#[structopt(short = "h", long = "rpc-host", default_value = "127.0.0.1:3901")]
+	rpc_host: SocketAddr,
 
-	api_port: u16,
-	rpc_port: u16,
-
-	bootstrap_peers: Vec<SocketAddr>,
+	#[structopt(subcommand)]
+	cmd: Command,
 }
 
-fn read_config(config_file: PathBuf) -> Result<Config, Error> {
-	let mut file = std::fs::OpenOptions::new()
-		.read(true)
-		.open(config_file.as_path())?;
-	
-	let mut config = String::new();
-	file.read_to_string(&mut config)?;
-
-	Ok(toml::from_str(&config)?)
+#[derive(StructOpt, Debug)]
+pub enum Command {
+	/// Run Garage server
+	#[structopt(name = "server")]
+	Server(ServerOpt),
+
+	/// Get network status
+	#[structopt(name = "status")]
+	Status,
+
+	/// Configure Garage node
+	#[structopt(name = "configure")]
+	Configure(ConfigureOpt),
 }
 
-fn gen_node_id(metadata_dir: &PathBuf) -> Result<UUID, Error> {
-	let mut id_file = metadata_dir.clone();
-	id_file.push("node_id");
-	if id_file.as_path().exists() {
-		let mut f = std::fs::File::open(id_file.as_path())?;
-		let mut d = vec![];
-		f.read_to_end(&mut d)?;
-		if d.len() != 32 {
-			return Err(Error::Message(format!("Corrupt node_id file")))
-		}
-
-		let mut id = [0u8; 32];
-		id.copy_from_slice(&d[..]);
-		Ok(id)
-	} else {
-		let id = rand::thread_rng().gen::<UUID>();
-
-		let mut f = std::fs::File::create(id_file.as_path())?;
-		f.write_all(&id[..])?;
-		Ok(id)
-	}
+#[derive(StructOpt, Debug)]
+pub struct ServerOpt {
+	/// Configuration file
+	#[structopt(short = "c", long = "config", default_value = "./config.toml")]
+	config_file: PathBuf,
 }
 
-async fn shutdown_signal(chans: Vec<oneshot::Sender<()>>) {
-    // Wait for the CTRL+C signal
-    tokio::signal::ctrl_c()
-        .await
-        .expect("failed to install CTRL+C signal handler");
-	for ch in chans {
-		ch.send(()).unwrap();
-	}
-}
+#[derive(StructOpt, Debug)]
+pub struct ConfigureOpt {
+	/// Node to configure (prefix of hexadecimal node id)
+	node_id: String,
 
-async fn wait_from(chan: oneshot::Receiver<()>) -> () {
-	chan.await.unwrap()
+	/// Number of tokens
+	n_tokens: u32,
 }
 
+
 #[tokio::main]
 async fn main() {
 	let opt = Opt::from_args();
-	let config = read_config(opt.config_file)
-		.expect("Unable to read config file");
-
-	let id = gen_node_id(&config.metadata_dir)
-		.expect("Unable to read or generate node ID");
-	println!("Node ID: {}", hex::encode(id));
-
-	let sys = Arc::new(System::new(config, id));
 
-	let (tx1, rx1) = oneshot::channel();
-	let (tx2, rx2) = oneshot::channel();
+	let rpc_cli = RpcClient::new();
 
-	let rpc_server = rpc::run_rpc_server(sys.clone(), wait_from(rx1));
-	let api_server = api::run_api_server(sys.clone(), wait_from(rx2));
+	let resp = match opt.cmd {
+		Command::Server(server_opt) => {
+			server::run_server(server_opt.config_file).await
+		}
+		Command::Status => {
+			cmd_status(rpc_cli, opt.rpc_host).await
+		}
+		Command::Configure(configure_opt) => {
+			cmd_configure(rpc_cli, opt.rpc_host, configure_opt).await
+		}
+	};
 
-	tokio::spawn(shutdown_signal(vec![tx1, tx2]));
-	tokio::spawn(sys.bootstrap());
+	if let Err(e) = resp {
+		eprintln!("Error: {}", e);
+	}
+}
 
-	let (e1, e2) = futures::join![rpc_server, api_server];
+async fn cmd_status(rpc_cli: RpcClient, rpc_host: SocketAddr) -> Result<(), Error> {
+	let status = match rpc_cli.call(&rpc_host, 
+								    &Message::PullStatus,
+									DEFAULT_TIMEOUT).await? {
+		Message::AdvertiseNodesUp(nodes) => nodes,
+		resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp)))
+	};
+	let config = match rpc_cli.call(&rpc_host, 
+								    &Message::PullConfig,
+									DEFAULT_TIMEOUT).await? {
+		Message::AdvertiseConfig(cfg) => cfg,
+		resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp)))
+	};
+
+	println!("Healthy nodes:");
+	for adv in status.iter() {
+		if let Some(cfg) = config.members.get(&adv.id) {
+			println!("{}\t{}\t{}\t{}", hex::encode(adv.id), adv.addr, adv.datacenter, cfg.n_tokens);
+		}
+	}
 
-	if let Err(e) = e1 {
-		eprintln!("RPC server error: {}", e)
+	let status_keys = status.iter().map(|x| x.id.clone()).collect::<HashSet<_>>();
+	if config.members.iter().any(|(id, _)| !status_keys.contains(id)) {
+		println!("\nFailed nodes:");
+		for (id, cfg) in config.members.iter() {
+			if !status.iter().any(|x| x.id == *id) {
+				println!("{}\t{}", hex::encode(id), cfg.n_tokens);
+			}
+		}
 	}
 
-	if let Err(e) = e2 {
-		eprintln!("API server error: {}", e)
+	if status.iter().any(|adv| !config.members.contains_key(&adv.id)) {
+		println!("\nUnconfigured nodes:");
+		for adv in status.iter() {
+			if !config.members.contains_key(&adv.id) {
+				println!("{}\t{}\t{}", hex::encode(adv.id), adv.addr, adv.datacenter);
+			}
+		}
 	}
+
+	Ok(())
 }
 
+async fn cmd_configure(rpc_cli: RpcClient, rpc_host: SocketAddr, args: ConfigureOpt) -> Result<(), Error> {
+	let status = match rpc_cli.call(&rpc_host, 
+								    &Message::PullStatus,
+									DEFAULT_TIMEOUT).await? {
+		Message::AdvertiseNodesUp(nodes) => nodes,
+		resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp)))
+	};
+
+	let mut candidates = vec![];
+	for adv in status.iter() {
+		if hex::encode(adv.id).starts_with(&args.node_id) {
+			candidates.push(adv.id.clone());
+		}
+	}
+	if candidates.len() != 1 {
+		return Err(Error::Message(format!("{} matching nodes", candidates.len())));
+	}
+
+	let mut config = match rpc_cli.call(&rpc_host, 
+								    &Message::PullConfig,
+									DEFAULT_TIMEOUT).await? {
+		Message::AdvertiseConfig(cfg) => cfg,
+		resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp)))
+	};
+
+	config.members.insert(candidates[0].clone(),
+						  NetworkConfigEntry{
+							  n_tokens: args.n_tokens,
+						  });
+	config.version += 1;
+
+	rpc_cli.call(&rpc_host,
+				 &Message::AdvertiseConfig(config),
+				 DEFAULT_TIMEOUT).await?;
+	Ok(())
+}
diff --git a/src/membership.rs b/src/membership.rs
index 7aaa0759..aa51e0fa 100644
--- a/src/membership.rs
+++ b/src/membership.rs
@@ -1,18 +1,20 @@
 use std::sync::Arc;
+use std::path::PathBuf;
+use std::io::{Read};
 use std::collections::HashMap;
 use std::time::Duration;
 use std::net::{IpAddr, SocketAddr};
 
+use tokio::prelude::*;
 use futures::future::join_all;
-use hyper::client::Client;
 use tokio::sync::RwLock;
 use sha2::{Sha256, Digest};
 
-use crate::Config;
+use crate::server::Config;
 use crate::error::Error;
 use crate::data::*;
 use crate::proto::*;
-use crate::rpc::*;
+use crate::rpc_client::*;
 
 const PING_INTERVAL: Duration = Duration::from_secs(10);
 const PING_TIMEOUT: Duration = Duration::from_secs(2);
@@ -22,7 +24,7 @@ pub struct System {
 	pub config: Config,
 	pub id: UUID,
 
-	pub rpc_client: Client<hyper::client::HttpConnector, hyper::Body>,
+	pub rpc_client: RpcClient,
 
 	pub members: RwLock<Members>,
 }
@@ -73,26 +75,62 @@ pub struct NodeStatus {
 	pub remaining_ping_attempts: usize,
 }
 
+fn read_network_config(metadata_dir: &PathBuf) -> Result<NetworkConfig, Error> {
+    let mut path = metadata_dir.clone();
+    path.push("network_config");
+
+	let mut file = std::fs::OpenOptions::new()
+		.read(true)
+		.open(path.as_path())?;
+	
+	let mut net_config_bytes = vec![];
+	file.read_to_end(&mut net_config_bytes)
+        .expect("Failure when reading network_config");
+
+    let net_config = rmp_serde::decode::from_read_ref(&net_config_bytes[..])
+        .expect("Invalid or corrupt network_config file");
+
+	Ok(net_config)
+}
 
 impl System {
 	pub fn new(config: Config, id: UUID) -> Self {
+        let net_config = match read_network_config(&config.metadata_dir) {
+            Ok(x) => x,
+            Err(_) => NetworkConfig{
+                members: HashMap::new(),
+                version: 0,
+			},
+        };
 		let mut members = Members{
 				status: HashMap::new(),
 				status_hash: [0u8; 32],
-				config: NetworkConfig{
-					members: HashMap::new(),
-					version: 0,
-				},
-			};
+				config: net_config,
+        };
 		members.recalculate_status_hash();
 		System{
 			config,
 			id,
-			rpc_client: Client::new(),
+			rpc_client: RpcClient::new(),
 			members: RwLock::new(members),
 		}
 	}
 
+    pub async fn save_network_config(&self) {
+        let mut path = self.config.metadata_dir.clone();
+        path.push("network_config");
+
+        let members = self.members.read().await;
+        let data = rmp_serde::encode::to_vec_named(&members.config)
+            .expect("Error while encoding network config");
+        drop(members);
+
+		let mut f = tokio::fs::File::create(path.as_path()).await
+            .expect("Could not create network_config");
+		f.write_all(&data[..]).await
+            .expect("Could not write network_config");
+    }
+
 	pub async fn make_ping(&self) -> Message {
 		let members = self.members.read().await;
 		Message::Ping(PingMessage{
@@ -129,7 +167,7 @@ impl System {
 				let sys = self.clone();
 				let ping_msg_ref = &ping_msg;
 				async move {
-					(id_option, addr.clone(), rpc_call_addr(sys, &addr, ping_msg_ref, PING_TIMEOUT).await)
+					(id_option, addr.clone(), sys.rpc_client.call(&addr, ping_msg_ref, PING_TIMEOUT).await)
 				}
 			})).await;
 		
@@ -146,6 +184,7 @@ impl System {
 					to_advertise.push(AdvertisedNode{
 						id: info.id.clone(),
 						addr: addr.clone(),
+                        datacenter: info.datacenter.clone(),
 					});
 				}
 				if is_new || members.status_hash != info.status_hash {
@@ -208,6 +247,7 @@ impl System {
 			mem.push(AdvertisedNode{
 				id: node.clone(),
 				addr: status.addr.clone(),
+                datacenter: status.datacenter.clone(),
 			});
 		}
 		Ok(Message::AdvertiseNodesUp(mem))
@@ -265,6 +305,7 @@ impl System {
 		if adv.version > members.config.version {
 			members.config = adv.clone();
 			tokio::spawn(self.clone().broadcast(Message::AdvertiseConfig(adv.clone()), PING_TIMEOUT));
+            self.save_network_config().await;
 		}
 
 		Ok(Message::Ok)
diff --git a/src/proto.rs b/src/proto.rs
index 3a950c6c..3e679d35 100644
--- a/src/proto.rs
+++ b/src/proto.rs
@@ -1,8 +1,11 @@
+use std::time::Duration;
 use std::net::SocketAddr;
 use serde::{Serialize, Deserialize};
 
 use crate::data::*;
 
+pub const DEFAULT_TIMEOUT: Duration = Duration::from_secs(2);
+
 #[derive(Debug, Serialize, Deserialize)]
 pub enum Message {
 	Ok,
@@ -29,4 +32,5 @@ pub struct PingMessage {
 pub struct AdvertisedNode {
 	pub id: UUID,
 	pub addr: SocketAddr,
+	pub datacenter: String,
 }
diff --git a/src/rpc_client.rs b/src/rpc_client.rs
new file mode 100644
index 00000000..057c19e8
--- /dev/null
+++ b/src/rpc_client.rs
@@ -0,0 +1,96 @@
+use std::net::SocketAddr;
+use std::sync::Arc;
+use std::time::Duration;
+
+use bytes::IntoBuf;
+use hyper::{Body, Method, Request, StatusCode};
+use hyper::client::Client;
+use futures::stream::futures_unordered::FuturesUnordered;
+use futures::stream::StreamExt;
+
+use crate::data::*;
+use crate::error::Error;
+use crate::proto::Message;
+use crate::membership::System;
+
+pub async fn rpc_call_many(sys: Arc<System>,
+						   to: &[UUID],
+						   msg: &Message,
+						   stop_after: Option<usize>,
+						   timeout: Duration)
+	-> Vec<Result<Message, Error>>
+{
+	let mut resp_stream = to.iter()
+		.map(|to| rpc_call(sys.clone(), to, msg, timeout))
+		.collect::<FuturesUnordered<_>>();
+
+	let mut results = vec![];
+	let mut n_ok = 0;
+	while let Some(resp) = resp_stream.next().await {
+		if resp.is_ok() {
+			n_ok += 1
+		}
+		results.push(resp);
+		if let Some(n) = stop_after {
+			if n_ok >= n {
+				break
+			}
+		}
+	}
+	results
+}
+
+pub async fn rpc_call(sys: Arc<System>,
+					  to: &UUID,
+					  msg: &Message,
+					  timeout: Duration)
+	-> Result<Message, Error>
+{
+	let addr = {
+		let members = sys.members.read().await;
+		match members.status.get(to) {
+			Some(status) => status.addr.clone(),
+			None => return Err(Error::Message(format!("Peer ID not found"))),
+		}
+	};
+	sys.rpc_client.call(&addr, msg, timeout).await
+}
+
+pub struct RpcClient {
+	pub client: Client<hyper::client::HttpConnector, hyper::Body>,
+}
+
+impl RpcClient {
+	pub fn new() -> Self {
+		RpcClient{
+			client: Client::new(),
+		}
+	}
+
+	pub async fn call(&self,
+					   to_addr: &SocketAddr,
+					   msg: &Message,
+					   timeout: Duration)
+		-> Result<Message, Error>
+	{
+		let uri = format!("http://{}/", to_addr);
+		let req = Request::builder()
+			.method(Method::POST)
+			.uri(uri)
+			.body(Body::from(rmp_serde::encode::to_vec_named(msg)?))?;
+
+		let resp_fut = self.client.request(req);
+		let resp = tokio::time::timeout(timeout, resp_fut).await??;
+
+		if resp.status() == StatusCode::OK {
+			let body = hyper::body::to_bytes(resp.into_body()).await?;
+			let msg = rmp_serde::decode::from_read::<_, Message>(body.into_buf())?;
+			match msg {
+				Message::Error(e) => Err(Error::RPCError(e)),
+				x => Ok(x)
+			}
+		} else {
+			Err(Error::RPCError(format!("Status code {}", resp.status())))
+		}
+	}
+}
diff --git a/src/rpc.rs b/src/rpc_server.rs
index 5f25dafb..55c7482b 100644
--- a/src/rpc.rs
+++ b/src/rpc_server.rs
@@ -1,96 +1,16 @@
 use std::net::SocketAddr;
 use std::sync::Arc;
-use std::time::Duration;
 
 use bytes::IntoBuf;
 use hyper::service::{make_service_fn, service_fn};
 use hyper::server::conn::AddrStream;
 use hyper::{Body, Method, Request, Response, Server, StatusCode};
 use futures::future::Future;
-use futures::stream::futures_unordered::FuturesUnordered;
-use futures::stream::StreamExt;
 
-use crate::data::*;
 use crate::error::Error;
 use crate::proto::Message;
 use crate::membership::System;
 
-// ---- CLIENT PART ----
-
-pub async fn rpc_call_many(sys: Arc<System>,
-						   to: &[UUID],
-						   msg: &Message,
-						   stop_after: Option<usize>,
-						   timeout: Duration)
-	-> Vec<Result<Message, Error>>
-{
-	let mut resp_stream = to.iter()
-		.map(|to| rpc_call(sys.clone(), to, msg, timeout))
-		.collect::<FuturesUnordered<_>>();
-
-	let mut results = vec![];
-	let mut n_ok = 0;
-	while let Some(resp) = resp_stream.next().await {
-		if resp.is_ok() {
-			n_ok += 1
-		}
-		results.push(resp);
-		if let Some(n) = stop_after {
-			if n_ok >= n {
-				break
-			}
-		}
-	}
-	results
-}
-
-// ----
-
-pub async fn rpc_call(sys: Arc<System>,
-					  to: &UUID,
-					  msg: &Message,
-					  timeout: Duration)
-	-> Result<Message, Error>
-{
-	let addr = {
-		let members = sys.members.read().await;
-		match members.status.get(to) {
-			Some(status) => status.addr.clone(),
-			None => return Err(Error::Message(format!("Peer ID not found"))),
-		}
-	};
-	rpc_call_addr(sys, &addr, msg, timeout).await
-}
-
-pub async fn rpc_call_addr(sys: Arc<System>,
-						   to_addr: &SocketAddr,
-					  	   msg: &Message,
-					  	   timeout: Duration)
-	-> Result<Message, Error>
-{
-	let uri = format!("http://{}/", to_addr);
-	let req = Request::builder()
-		.method(Method::POST)
-		.uri(uri)
-		.body(Body::from(rmp_serde::encode::to_vec_named(msg)?))?;
-
-	let resp_fut = sys.rpc_client.request(req);
-	let resp = tokio::time::timeout(timeout, resp_fut).await??;
-
-	if resp.status() == StatusCode::OK {
-		let body = hyper::body::to_bytes(resp.into_body()).await?;
-		let msg = rmp_serde::decode::from_read::<_, Message>(body.into_buf())?;
-		match msg {
-			Message::Error(e) => Err(Error::RPCError(e)),
-			x => Ok(x)
-		}
-	} else {
-		Err(Error::RPCError(format!("Status code {}", resp.status())))
-	}
-}
-
-// ---- SERVER PART ----
-
 fn err_to_msg(x: Result<Message, Error>) -> Message {
 	match x {
 		Err(e) => Message::Error(format!("{}", e)),
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 00000000..04f98c65
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,98 @@
+use std::io::{Read, Write};
+use std::sync::Arc;
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use futures::channel::oneshot;
+use serde::Deserialize;
+use rand::Rng;
+
+use crate::data::UUID;
+use crate::error::Error;
+use crate::membership::System;
+use crate::api_server;
+use crate::rpc_server;
+
+#[derive(Deserialize, Debug)]
+pub struct Config {
+	pub datacenter: String,
+
+	pub metadata_dir: PathBuf,
+	pub data_dir: PathBuf,
+
+	pub api_port: u16,
+	pub rpc_port: u16,
+
+	pub bootstrap_peers: Vec<SocketAddr>,
+}
+
+fn read_config(config_file: PathBuf) -> Result<Config, Error> {
+	let mut file = std::fs::OpenOptions::new()
+		.read(true)
+		.open(config_file.as_path())?;
+	
+	let mut config = String::new();
+	file.read_to_string(&mut config)?;
+
+	Ok(toml::from_str(&config)?)
+}
+
+fn gen_node_id(metadata_dir: &PathBuf) -> Result<UUID, Error> {
+	let mut id_file = metadata_dir.clone();
+	id_file.push("node_id");
+	if id_file.as_path().exists() {
+		let mut f = std::fs::File::open(id_file.as_path())?;
+		let mut d = vec![];
+		f.read_to_end(&mut d)?;
+		if d.len() != 32 {
+			return Err(Error::Message(format!("Corrupt node_id file")))
+		}
+
+		let mut id = [0u8; 32];
+		id.copy_from_slice(&d[..]);
+		Ok(id)
+	} else {
+		let id = rand::thread_rng().gen::<UUID>();
+
+		let mut f = std::fs::File::create(id_file.as_path())?;
+		f.write_all(&id[..])?;
+		Ok(id)
+	}
+}
+
+async fn shutdown_signal(chans: Vec<oneshot::Sender<()>>) {
+    // Wait for the CTRL+C signal
+    tokio::signal::ctrl_c()
+        .await
+        .expect("failed to install CTRL+C signal handler");
+	println!("Received CTRL+C, shutting down.");
+	for ch in chans {
+		ch.send(()).unwrap();
+	}
+}
+
+async fn wait_from(chan: oneshot::Receiver<()>) -> () {
+	chan.await.unwrap()
+}
+
+pub async fn run_server(config_file: PathBuf) -> Result<(), Error> {
+	let config = read_config(config_file)
+		.expect("Unable to read config file");
+
+	let id = gen_node_id(&config.metadata_dir)
+		.expect("Unable to read or generate node ID");
+	println!("Node ID: {}", hex::encode(id));
+
+	let sys = Arc::new(System::new(config, id));
+
+	let (tx1, rx1) = oneshot::channel();
+	let (tx2, rx2) = oneshot::channel();
+
+	let rpc_server = rpc_server::run_rpc_server(sys.clone(), wait_from(rx1));
+	let api_server = api_server::run_api_server(sys.clone(), wait_from(rx2));
+
+	tokio::spawn(shutdown_signal(vec![tx1, tx2]));
+	tokio::spawn(sys.bootstrap());
+
+	futures::try_join!(rpc_server, api_server)?;
+	Ok(())
+}