forked from Deuxfleurs/garage
437 lines
12 KiB
Rust
437 lines
12 KiB
Rust
use std::sync::Arc;
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use std::hash::Hash as StdHash;
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use std::hash::Hasher;
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use std::path::PathBuf;
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use std::io::{Read};
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use std::collections::HashMap;
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use std::time::Duration;
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use std::net::{IpAddr, SocketAddr};
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use sha2::{Sha256, Digest};
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use tokio::prelude::*;
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use futures::future::join_all;
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use tokio::sync::RwLock;
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use crate::server::Config;
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use crate::error::Error;
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use crate::data::*;
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use crate::proto::*;
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use crate::rpc_client::*;
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const PING_INTERVAL: Duration = Duration::from_secs(10);
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const PING_TIMEOUT: Duration = Duration::from_secs(2);
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const MAX_FAILED_PINGS: usize = 3;
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pub struct System {
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pub config: Config,
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pub id: UUID,
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pub rpc_client: RpcClient,
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pub members: RwLock<Members>,
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}
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pub struct Members {
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pub status: HashMap<UUID, NodeStatus>,
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pub status_hash: Hash,
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pub config: NetworkConfig,
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pub ring: Vec<RingEntry>,
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pub n_datacenters: usize,
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}
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pub struct NodeStatus {
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pub addr: SocketAddr,
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pub remaining_ping_attempts: usize,
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}
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#[derive(Debug)]
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pub struct RingEntry {
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pub location: Hash,
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pub node: UUID,
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pub datacenter: u64,
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}
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impl Members {
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fn handle_ping(&mut self, ip: IpAddr, info: &PingMessage) -> bool {
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let addr = SocketAddr::new(ip, info.rpc_port);
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let old_status = self.status.insert(info.id.clone(),
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NodeStatus{
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addr: addr.clone(),
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remaining_ping_attempts: MAX_FAILED_PINGS,
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});
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match old_status {
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None => {
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eprintln!("Newly pingable node: {}", hex::encode(&info.id));
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true
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}
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Some(x) => x.addr != addr,
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}
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}
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fn recalculate_status_hash(&mut self) {
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let mut nodes = self.status.iter().collect::<Vec<_>>();
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nodes.sort_unstable_by_key(|(id, _status)| *id);
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let mut hasher = Sha256::new();
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eprintln!("Current set of pingable nodes: --");
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for (id, status) in nodes {
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eprintln!("{} {}", hex::encode(&id), status.addr);
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hasher.input(format!("{} {}\n", hex::encode(&id), status.addr));
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}
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eprintln!("END --");
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self.status_hash.as_slice_mut().copy_from_slice(&hasher.result()[..]);
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}
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fn rebuild_ring(&mut self) {
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let mut new_ring = vec![];
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let mut datacenters = vec![];
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for (id, config) in self.config.members.iter() {
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let mut dc_hasher = std::collections::hash_map::DefaultHasher::new();
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config.datacenter.hash(&mut dc_hasher);
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let datacenter = dc_hasher.finish();
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if !datacenters.contains(&datacenter) {
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datacenters.push(datacenter);
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}
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for i in 0..config.n_tokens {
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let location = hash(format!("{} {}", hex::encode(&id), i).as_bytes());
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new_ring.push(RingEntry{
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location: location.into(),
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node: id.clone(),
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datacenter,
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})
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}
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}
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new_ring.sort_unstable_by(|x, y| x.location.cmp(&y.location));
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self.ring = new_ring;
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self.n_datacenters = datacenters.len();
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eprintln!("RING: --");
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for e in self.ring.iter() {
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eprintln!("{:?}", e);
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}
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eprintln!("END --");
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}
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pub fn walk_ring(&self, from: &Hash, n: usize) -> Vec<UUID> {
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if n >= self.config.members.len() {
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return self.config.members.keys().cloned().collect::<Vec<_>>();
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}
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let start = match self.ring.binary_search_by(|x| x.location.cmp(from)) {
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Ok(i) => i,
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Err(i) => if i == 0 {
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self.ring.len() - 1
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} else {
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i - 1
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}
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};
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self.walk_ring_from_pos(start, n)
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}
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fn walk_ring_from_pos(&self, start: usize, n: usize) -> Vec<UUID> {
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let mut ret = vec![];
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let mut datacenters = vec![];
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for delta in 0..self.ring.len() {
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if ret.len() == n {
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break;
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}
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let i = (start + delta) % self.ring.len();
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if datacenters.len() == self.n_datacenters && !ret.contains(&self.ring[i].node) {
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ret.push(self.ring[i].node.clone());
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} else if !datacenters.contains(&self.ring[i].datacenter) {
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ret.push(self.ring[i].node.clone());
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datacenters.push(self.ring[i].datacenter);
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}
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}
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ret
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}
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}
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fn read_network_config(metadata_dir: &PathBuf) -> Result<NetworkConfig, Error> {
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let mut path = metadata_dir.clone();
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path.push("network_config");
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let mut file = std::fs::OpenOptions::new()
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.read(true)
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.open(path.as_path())?;
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let mut net_config_bytes = vec![];
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file.read_to_end(&mut net_config_bytes)
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.expect("Failure when reading network_config");
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let net_config = rmp_serde::decode::from_read_ref(&net_config_bytes[..])
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.expect("Invalid or corrupt network_config file");
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Ok(net_config)
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}
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impl System {
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pub fn new(config: Config, id: UUID) -> Self {
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let net_config = match read_network_config(&config.metadata_dir) {
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Ok(x) => x,
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Err(_) => NetworkConfig{
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members: HashMap::new(),
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version: 0,
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},
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};
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let mut members = Members{
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status: HashMap::new(),
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status_hash: Hash::default(),
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config: net_config,
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ring: Vec::new(),
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n_datacenters: 0,
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};
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members.recalculate_status_hash();
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members.rebuild_ring();
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System{
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config,
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id,
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rpc_client: RpcClient::new(),
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members: RwLock::new(members),
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}
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}
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async fn save_network_config(self: Arc<Self>) {
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let mut path = self.config.metadata_dir.clone();
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path.push("network_config");
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let members = self.members.read().await;
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let data = rmp_to_vec_all_named(&members.config)
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.expect("Error while encoding network config");
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drop(members);
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let mut f = tokio::fs::File::create(path.as_path()).await
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.expect("Could not create network_config");
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f.write_all(&data[..]).await
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.expect("Could not write network_config");
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}
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pub async fn make_ping(&self) -> Message {
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let members = self.members.read().await;
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Message::Ping(PingMessage{
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id: self.id.clone(),
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rpc_port: self.config.rpc_port,
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status_hash: members.status_hash.clone(),
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config_version: members.config.version,
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})
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}
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pub async fn broadcast(self: Arc<Self>, msg: Message, timeout: Duration) {
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let members = self.members.read().await;
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let to = members.status.keys().filter(|x| **x != self.id).cloned().collect::<Vec<_>>();
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drop(members);
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rpc_call_many(self.clone(), &to[..], &msg, timeout).await;
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}
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pub async fn bootstrap(self: Arc<Self>) {
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let bootstrap_peers = self.config.bootstrap_peers
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.iter()
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.map(|ip| (ip.clone(), None))
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.collect::<Vec<_>>();
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self.clone().ping_nodes(bootstrap_peers).await;
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tokio::spawn(self.ping_loop());
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}
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pub async fn ping_nodes(self: Arc<Self>, peers: Vec<(SocketAddr, Option<UUID>)>) {
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let ping_msg = self.make_ping().await;
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let ping_resps = join_all(
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peers.iter()
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.map(|(addr, id_option)| {
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let sys = self.clone();
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let ping_msg_ref = &ping_msg;
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async move {
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(id_option, addr.clone(), sys.rpc_client.call(&addr, ping_msg_ref, PING_TIMEOUT).await)
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}
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})).await;
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let mut members = self.members.write().await;
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let mut has_changes = false;
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let mut to_advertise = vec![];
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for (id_option, addr, ping_resp) in ping_resps {
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if let Ok(Message::Ping(info)) = ping_resp {
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let is_new = members.handle_ping(addr.ip(), &info);
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if is_new {
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has_changes = true;
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to_advertise.push(AdvertisedNode{
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id: info.id.clone(),
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addr: addr.clone(),
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});
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}
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if is_new || members.status_hash != info.status_hash {
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tokio::spawn(self.clone().pull_status(info.id.clone()));
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}
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if is_new || members.config.version < info.config_version {
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tokio::spawn(self.clone().pull_config(info.id.clone()));
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}
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} else if let Some(id) = id_option {
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let remaining_attempts = members.status.get(id).map(|x| x.remaining_ping_attempts).unwrap_or(0);
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if remaining_attempts == 0 {
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eprintln!("Removing node {} after too many failed pings", hex::encode(&id));
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members.status.remove(&id);
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has_changes = true;
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} else {
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if let Some(st) = members.status.get_mut(id) {
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st.remaining_ping_attempts = remaining_attempts - 1;
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}
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}
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}
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}
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if has_changes {
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members.recalculate_status_hash();
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}
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drop(members);
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if to_advertise.len() > 0 {
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self.broadcast(Message::AdvertiseNodesUp(to_advertise), PING_TIMEOUT).await;
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}
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}
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pub async fn handle_ping(self: Arc<Self>,
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from: &SocketAddr,
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ping: &PingMessage)
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-> Result<Message, Error>
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{
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let mut members = self.members.write().await;
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let is_new = members.handle_ping(from.ip(), ping);
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if is_new {
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members.recalculate_status_hash();
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}
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let status_hash = members.status_hash.clone();
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let config_version = members.config.version;
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drop(members);
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if is_new || status_hash != ping.status_hash {
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tokio::spawn(self.clone().pull_status(ping.id.clone()));
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}
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if is_new || config_version < ping.config_version {
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tokio::spawn(self.clone().pull_config(ping.id.clone()));
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}
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Ok(self.make_ping().await)
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}
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pub async fn handle_pull_status(&self) -> Result<Message, Error> {
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let members = self.members.read().await;
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let mut mem = vec![];
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for (node, status) in members.status.iter() {
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mem.push(AdvertisedNode{
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id: node.clone(),
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addr: status.addr.clone(),
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});
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}
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Ok(Message::AdvertiseNodesUp(mem))
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}
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pub async fn handle_pull_config(&self) -> Result<Message, Error> {
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let members = self.members.read().await;
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Ok(Message::AdvertiseConfig(members.config.clone()))
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}
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pub async fn handle_advertise_nodes_up(self: Arc<Self>,
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adv: &[AdvertisedNode])
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-> Result<Message, Error>
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{
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let mut to_ping = vec![];
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let mut members = self.members.write().await;
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let mut has_changed = false;
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for node in adv.iter() {
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if node.id == self.id {
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// learn our own ip address
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let self_addr = SocketAddr::new(node.addr.ip(), self.config.rpc_port);
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let old_self = members.status.insert(node.id.clone(),
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NodeStatus{
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addr: self_addr,
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remaining_ping_attempts: MAX_FAILED_PINGS,
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});
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has_changed = match old_self {
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None => true,
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Some(x) => x.addr != self_addr,
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};
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} else if !members.status.contains_key(&node.id) {
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to_ping.push((node.addr.clone(), Some(node.id.clone())));
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}
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}
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if has_changed {
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members.recalculate_status_hash();
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}
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drop(members);
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if to_ping.len() > 0 {
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tokio::spawn(self.clone().ping_nodes(to_ping));
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}
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Ok(Message::Ok)
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}
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pub async fn handle_advertise_config(self: Arc<Self>,
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adv: &NetworkConfig)
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-> Result<Message, Error>
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{
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let mut members = self.members.write().await;
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if adv.version > members.config.version {
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members.config = adv.clone();
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members.rebuild_ring();
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tokio::spawn(self.clone().broadcast(Message::AdvertiseConfig(adv.clone()), PING_TIMEOUT));
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tokio::spawn(self.clone().save_network_config());
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}
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Ok(Message::Ok)
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}
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pub async fn ping_loop(self: Arc<Self>) {
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loop {
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let restart_at = tokio::time::delay_for(PING_INTERVAL);
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let members = self.members.read().await;
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let ping_addrs = members.status.iter()
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.filter(|(id, _)| **id != self.id)
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.map(|(id, status)| (status.addr.clone(), Some(id.clone())))
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.collect::<Vec<_>>();
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drop(members);
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self.clone().ping_nodes(ping_addrs).await;
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restart_at.await
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}
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}
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pub fn pull_status(self: Arc<Self>, peer: UUID) -> impl futures::future::Future<Output=()> + Send + 'static {
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async move {
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let resp = rpc_call(self.clone(),
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&peer,
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&Message::PullStatus,
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PING_TIMEOUT).await;
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if let Ok(Message::AdvertiseNodesUp(nodes)) = resp {
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let _: Result<_, _> = self.handle_advertise_nodes_up(&nodes).await;
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}
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}
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}
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pub async fn pull_config(self: Arc<Self>, peer: UUID) {
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let resp = rpc_call(self.clone(),
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&peer,
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&Message::PullConfig,
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PING_TIMEOUT).await;
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if let Ok(Message::AdvertiseConfig(config)) = resp {
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let _: Result<_, _> = self.handle_advertise_config(&config).await;
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}
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}
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}
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