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Keep network status & ring in a tokio::sync::watch

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advantages
- reads don't prevent preparing writes
- can be followed from other parts of the system by cloning the receiver
This commit is contained in:
Alex 2020-04-11 23:53:32 +02:00
parent 5dd59e437d
commit 9c931f5eda
9 changed files with 165 additions and 133 deletions
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12
src/api_server.rs
View file

@ -212,9 +212,9 @@ async fn put_block_meta(
async fn put_block(garage: Arc<Garage>, hash: Hash, data: Vec<u8>) -> Result<(), Error> {
let who = garage
.system
.members
.read()
.await
.ring
.borrow()
.clone()
.walk_ring(&hash, garage.system.config.meta_replication_factor);
rpc_try_call_many(
garage.system.clone(),
@ -359,9 +359,9 @@ async fn handle_get(
async fn get_block(garage: Arc<Garage>, hash: &Hash) -> Result<Vec<u8>, Error> {
let who = garage
.system
.members
.read()
.await
.ring
.borrow()
.clone()
.walk_ring(&hash, garage.system.config.meta_replication_factor);
let resps = rpc_try_call_many(
garage.system.clone(),

26
src/block.rs
View file

@ -1,15 +1,14 @@
use std::path::PathBuf;
use futures_util::future::*;
use tokio::fs;
use tokio::prelude::*;
use tokio::sync::Mutex;
use futures_util::future::*;
use crate::background::*;
use crate::data::*;
use crate::error::Error;
use crate::proto::*;
use crate::background::*;
pub struct BlockManager {
pub data_dir: PathBuf,
@ -19,10 +18,11 @@ pub struct BlockManager {
impl BlockManager {
pub fn new(db: &sled::Db, data_dir: PathBuf) -> Self {
let rc = db.open_tree("block_local_rc")
let rc = db
.open_tree("block_local_rc")
.expect("Unable to open block_local_rc tree");
rc.set_merge_operator(rc_merge);
Self{
Self {
rc,
data_dir,
lock: Mutex::new(()),
@ -81,18 +81,20 @@ impl BlockManager {
background.spawn(tokio::fs::remove_file(path).map_err(Into::into));
Ok(())
}
Some(_) => Ok(())
Some(_) => Ok(()),
}
}
}
fn rc_merge(_key: &[u8], old: Option<&[u8]>, new: &[u8]) -> Option<Vec<u8>> {
let old = old.map(|x| {
assert!(x.len() == 8);
let mut x8 = [0u8; 8];
x8.copy_from_slice(x);
u64::from_be_bytes(x8)
}).unwrap_or(0);
let old = old
.map(|x| {
assert!(x.len() == 8);
let mut x8 = [0u8; 8];
x8.copy_from_slice(x);
u64::from_be_bytes(x8)
})
.unwrap_or(0);
assert!(new.len() == 1);
let new = match new[0] {
0 => {

7
src/block_ref_table.rs
View file

@ -55,8 +55,11 @@ impl TableFormat for BlockRefTable {
}
}
if was_before && !is_after {
if let Err(e) = garage.block_manager.block_decref(&new.block, &garage.background) {
eprintln!("Failed to decref or delete block {:?}: {}", &new.block, e);
if let Err(e) = garage
.block_manager
.block_decref(&new.block, &garage.background)
{
eprintln!("Failed to decref block {:?}: {}", &new.block, e);
}
}
}

185
src/membership.rs
View file

@ -13,7 +13,7 @@ use futures_util::future::*;
use sha2::{Digest, Sha256};
use tokio::prelude::*;
use tokio::sync::watch;
use tokio::sync::RwLock;
use tokio::sync::Mutex;
use crate::background::BackgroundRunner;
use crate::data::*;
@ -32,36 +32,44 @@ pub struct System {
pub rpc_client: RpcClient,
pub members: RwLock<Members>,
pub status: watch::Receiver<Arc<Status>>,
pub ring: watch::Receiver<Arc<Ring>>,
update_lock: Mutex<(watch::Sender<Arc<Status>>, watch::Sender<Arc<Ring>>)>,
pub background: Arc<BackgroundRunner>,
}
pub struct Members {
pub status: HashMap<UUID, NodeStatus>,
pub status_hash: Hash,
pub config: NetworkConfig,
pub ring: Vec<RingEntry>,
pub n_datacenters: usize,
#[derive(Debug, Clone)]
pub struct Status {
pub nodes: HashMap<UUID, NodeStatus>,
pub hash: Hash,
}
#[derive(Debug, Clone)]
pub struct NodeStatus {
pub addr: SocketAddr,
pub remaining_ping_attempts: usize,
}
#[derive(Debug)]
#[derive(Clone)]
pub struct Ring {
pub config: NetworkConfig,
pub ring: Vec<RingEntry>,
pub n_datacenters: usize,
}
#[derive(Clone, Debug)]
pub struct RingEntry {
pub location: Hash,
pub node: UUID,
pub datacenter: u64,
}
impl Members {
impl Status {
fn handle_ping(&mut self, ip: IpAddr, info: &PingMessage) -> bool {
let addr = SocketAddr::new(ip, info.rpc_port);
let old_status = self.status.insert(
let old_status = self.nodes.insert(
info.id.clone(),
NodeStatus {
addr: addr.clone(),
@ -77,8 +85,8 @@ impl Members {
}
}
fn recalculate_status_hash(&mut self) {
let mut nodes = self.status.iter().collect::<Vec<_>>();
fn recalculate_hash(&mut self) {
let mut nodes = self.nodes.iter().collect::<Vec<_>>();
nodes.sort_unstable_by_key(|(id, _status)| *id);
let mut hasher = Sha256::new();
@ -88,11 +96,13 @@ impl Members {
hasher.input(format!("{} {}\n", hex::encode(&id), status.addr));
}
eprintln!("END --");
self.status_hash
self.hash
.as_slice_mut()
.copy_from_slice(&hasher.result()[..]);
}
}
impl Ring {
fn rebuild_ring(&mut self) {
let mut new_ring = vec![];
let mut datacenters = vec![];
@ -201,20 +211,28 @@ impl System {
}
}
};
let mut members = Members {
status: HashMap::new(),
status_hash: Hash::default(),
let mut status = Status {
nodes: HashMap::new(),
hash: Hash::default(),
};
status.recalculate_hash();
let (update_status, status) = watch::channel(Arc::new(status));
let mut ring = Ring {
config: net_config,
ring: Vec::new(),
n_datacenters: 0,
};
members.recalculate_status_hash();
members.rebuild_ring();
ring.rebuild_ring();
let (update_ring, ring) = watch::channel(Arc::new(ring));
System {
config,
id,
rpc_client: RpcClient::new(),
members: RwLock::new(members),
status,
ring,
update_lock: Mutex::new((update_status, update_ring)),
background,
}
}
@ -223,37 +241,33 @@ impl System {
let mut path = self.config.metadata_dir.clone();
path.push("network_config");
let members = self.members.read().await;
let data =
rmp_to_vec_all_named(&members.config)?;
drop(members);
let ring = self.ring.borrow().clone();
let data = rmp_to_vec_all_named(&ring.config)?;
let mut f = tokio::fs::File::create(path.as_path())
.await?;
f.write_all(&data[..])
.await?;
let mut f = tokio::fs::File::create(path.as_path()).await?;
f.write_all(&data[..]).await?;
Ok(())
}
pub async fn make_ping(&self) -> Message {
let members = self.members.read().await;
pub fn make_ping(&self) -> Message {
let status = self.status.borrow().clone();
let ring = self.ring.borrow().clone();
Message::Ping(PingMessage {
id: self.id.clone(),
rpc_port: self.config.rpc_port,
status_hash: members.status_hash.clone(),
config_version: members.config.version,
status_hash: status.hash.clone(),
config_version: ring.config.version,
})
}
pub async fn broadcast(self: Arc<Self>, msg: Message, timeout: Duration) {
let members = self.members.read().await;
let to = members
.status
let status = self.status.borrow().clone();
let to = status
.nodes
.keys()
.filter(|x| **x != self.id)
.cloned()
.collect::<Vec<_>>();
drop(members);
rpc_call_many(self.clone(), &to[..], &msg, timeout).await;
}
@ -273,7 +287,7 @@ impl System {
}
pub async fn ping_nodes(self: Arc<Self>, peers: Vec<(SocketAddr, Option<UUID>)>) {
let ping_msg = self.make_ping().await;
let ping_msg = self.make_ping();
let ping_resps = join_all(peers.iter().map(|(addr, id_option)| {
let sys = self.clone();
let ping_msg_ref = &ping_msg;
@ -287,14 +301,16 @@ impl System {
}))
.await;
let mut members = self.members.write().await;
let update_locked = self.update_lock.lock().await;
let mut status: Status = self.status.borrow().as_ref().clone();
let ring = self.ring.borrow().clone();
let mut has_changes = false;
let mut to_advertise = vec![];
for (id_option, addr, ping_resp) in ping_resps {
if let Ok(Message::Ping(info)) = ping_resp {
let is_new = members.handle_ping(addr.ip(), &info);
let is_new = status.handle_ping(addr.ip(), &info);
if is_new {
has_changes = true;
to_advertise.push(AdvertisedNode {
@ -302,17 +318,17 @@ impl System {
addr: addr.clone(),
});
}
if is_new || members.status_hash != info.status_hash {
if is_new || status.hash != info.status_hash {
self.background
.spawn_cancellable(self.clone().pull_status(info.id.clone()).map(Ok));
}
if is_new || members.config.version < info.config_version {
if is_new || ring.config.version < info.config_version {
self.background
.spawn_cancellable(self.clone().pull_config(info.id.clone()).map(Ok));
}
} else if let Some(id) = id_option {
let remaining_attempts = members
.status
let remaining_attempts = status
.nodes
.get(id)
.map(|x| x.remaining_ping_attempts)
.unwrap_or(0);
@ -321,19 +337,22 @@ impl System {
"Removing node {} after too many failed pings",
hex::encode(&id)
);
members.status.remove(&id);
status.nodes.remove(&id);
has_changes = true;
} else {
if let Some(st) = members.status.get_mut(id) {
if let Some(st) = status.nodes.get_mut(id) {
st.remaining_ping_attempts = remaining_attempts - 1;
}
}
}
}
if has_changes {
members.recalculate_status_hash();
status.recalculate_hash();
}
drop(members);
if let Err(e) = update_locked.0.broadcast(Arc::new(status)) {
eprintln!("In ping_nodes: could not save status update ({})", e);
}
drop(update_locked);
if to_advertise.len() > 0 {
self.broadcast(Message::AdvertiseNodesUp(to_advertise), PING_TIMEOUT)
@ -346,29 +365,35 @@ impl System {
from: &SocketAddr,
ping: &PingMessage,
) -> Result<Message, Error> {
let mut members = self.members.write().await;
let is_new = members.handle_ping(from.ip(), ping);
let update_locked = self.update_lock.lock().await;
let mut status: Status = self.status.borrow().as_ref().clone();
let is_new = status.handle_ping(from.ip(), ping);
if is_new {
members.recalculate_status_hash();
status.recalculate_hash();
}
let status_hash = members.status_hash.clone();
let config_version = members.config.version;
drop(members);
let status_hash = status.hash.clone();
let config_version = self.ring.borrow().config.version;
update_locked.0.broadcast(Arc::new(status))?;
drop(update_locked);
if is_new || status_hash != ping.status_hash {
self.background.spawn_cancellable(self.clone().pull_status(ping.id.clone()).map(Ok));
self.background
.spawn_cancellable(self.clone().pull_status(ping.id.clone()).map(Ok));
}
if is_new || config_version < ping.config_version {
self.background.spawn_cancellable(self.clone().pull_config(ping.id.clone()).map(Ok));
self.background
.spawn_cancellable(self.clone().pull_config(ping.id.clone()).map(Ok));
}
Ok(self.make_ping().await)
Ok(self.make_ping())
}
pub async fn handle_pull_status(&self) -> Result<Message, Error> {
let members = self.members.read().await;
pub fn handle_pull_status(&self) -> Result<Message, Error> {
let status = self.status.borrow().clone();
let mut mem = vec![];
for (node, status) in members.status.iter() {
for (node, status) in status.nodes.iter() {
mem.push(AdvertisedNode {
id: node.clone(),
addr: status.addr.clone(),
@ -377,9 +402,9 @@ impl System {
Ok(Message::AdvertiseNodesUp(mem))
}
pub async fn handle_pull_config(&self) -> Result<Message, Error> {
let members = self.members.read().await;
Ok(Message::AdvertiseConfig(members.config.clone()))
pub fn handle_pull_config(&self) -> Result<Message, Error> {
let ring = self.ring.borrow().clone();
Ok(Message::AdvertiseConfig(ring.config.clone()))
}
pub async fn handle_advertise_nodes_up(
@ -388,14 +413,15 @@ impl System {
) -> Result<Message, Error> {
let mut to_ping = vec![];
let mut members = self.members.write().await;
let update_lock = self.update_lock.lock().await;
let mut status: Status = self.status.borrow().as_ref().clone();
let mut has_changed = false;
for node in adv.iter() {
if node.id == self.id {
// learn our own ip address
let self_addr = SocketAddr::new(node.addr.ip(), self.config.rpc_port);
let old_self = members.status.insert(
let old_self = status.nodes.insert(
node.id.clone(),
NodeStatus {
addr: self_addr,
@ -406,17 +432,19 @@ impl System {
None => true,
Some(x) => x.addr != self_addr,
};
} else if !members.status.contains_key(&node.id) {
} else if !status.nodes.contains_key(&node.id) {
to_ping.push((node.addr.clone(), Some(node.id.clone())));
}
}
if has_changed {
members.recalculate_status_hash();
status.recalculate_hash();
}
drop(members);
update_lock.0.broadcast(Arc::new(status))?;
drop(update_lock);
if to_ping.len() > 0 {
self.background.spawn_cancellable(self.clone().ping_nodes(to_ping).map(Ok));
self.background
.spawn_cancellable(self.clone().ping_nodes(to_ping).map(Ok));
}
Ok(Message::Ok)
@ -426,10 +454,14 @@ impl System {
self: Arc<Self>,
adv: &NetworkConfig,
) -> Result<Message, Error> {
let mut members = self.members.write().await;
if adv.version > members.config.version {
members.config = adv.clone();
members.rebuild_ring();
let mut ring: Ring = self.ring.borrow().as_ref().clone();
let update_lock = self.update_lock.lock().await;
if adv.version > ring.config.version {
ring.config = adv.clone();
ring.rebuild_ring();
update_lock.1.broadcast(Arc::new(ring))?;
drop(update_lock);
self.background.spawn_cancellable(
self.clone()
@ -446,14 +478,13 @@ impl System {
loop {
let restart_at = tokio::time::delay_for(PING_INTERVAL);
let members = self.members.read().await;
let ping_addrs = members
.status
let status = self.status.borrow().clone();
let ping_addrs = status
.nodes
.iter()
.filter(|(id, _)| **id != self.id)
.map(|(id, status)| (status.addr.clone(), Some(id.clone())))
.collect::<Vec<_>>();
drop(members);
self.clone().ping_nodes(ping_addrs).await;

4
src/rpc_client.rs
View file

@ -79,8 +79,8 @@ pub async fn rpc_call(
timeout: Duration,
) -> Result<Message, Error> {
let addr = {
let members = sys.members.read().await;
match members.status.get(to) {
let status = sys.status.borrow().clone();
match status.nodes.get(to) {
Some(status) => status.addr.clone(),
None => return Err(Error::Message(format!("Peer ID not found"))),
}

4
src/rpc_server.rs
View file

@ -59,8 +59,8 @@ async fn handler(
let resp = err_to_msg(match &msg {
Message::Ping(ping) => sys.handle_ping(&addr, ping).await,
Message::PullStatus => sys.handle_pull_status().await,
Message::PullConfig => sys.handle_pull_config().await,
Message::PullStatus => sys.handle_pull_status(),
Message::PullConfig => sys.handle_pull_config(),
Message::AdvertiseNodesUp(adv) => sys.handle_advertise_nodes_up(adv).await,
Message::AdvertiseConfig(adv) => sys.handle_advertise_config(adv).await,

2
src/server.rs
View file

@ -10,8 +10,8 @@ use tokio::sync::RwLock;
use crate::api_server;
use crate::background::*;
use crate::data::*;
use crate::block::*;
use crate::data::*;
use crate::error::Error;
use crate::membership::System;
use crate::proto::*;

47
src/table.rs
View file

@ -3,9 +3,9 @@ use std::sync::Arc;
use std::time::Duration;
use async_trait::async_trait;
use futures::stream::*;
use serde::{Deserialize, Serialize};
use serde_bytes::ByteBuf;
use futures::stream::*;
use crate::data::*;
use crate::error::Error;
@ -150,9 +150,9 @@ impl<F: TableFormat + 'static> Table<F> {
let hash = e.partition_key().hash();
let who = self
.system
.members
.read()
.await
.ring
.borrow()
.clone()
.walk_ring(&hash, self.param.replication_factor);
eprintln!("insert who: {:?}", who);
@ -171,9 +171,9 @@ impl<F: TableFormat + 'static> Table<F> {
let hash = entry.partition_key().hash();
let who = self
.system
.members
.read()
.await
.ring
.borrow()
.clone()
.walk_ring(&hash, self.param.replication_factor);
let e_enc = Arc::new(ByteBuf::from(rmp_to_vec_all_named(entry)?));
for node in who {
@ -184,20 +184,14 @@ impl<F: TableFormat + 'static> Table<F> {
}
}
let call_futures = call_list.drain()
.map(|(node, entries)| async move {
let rpc = TableRPC::<F>::Update(entries);
let rpc_bytes = rmp_to_vec_all_named(&rpc)?;
let message = Message::TableRPC(self.name.to_string(), rpc_bytes);
let call_futures = call_list.drain().map(|(node, entries)| async move {
let rpc = TableRPC::<F>::Update(entries);
let rpc_bytes = rmp_to_vec_all_named(&rpc)?;
let message = Message::TableRPC(self.name.to_string(), rpc_bytes);
let resp = rpc_call(
self.system.clone(),
&node,
&message,
self.param.timeout
).await?;
Ok::<_, Error>((node, resp))
});
let resp = rpc_call(self.system.clone(), &node, &message, self.param.timeout).await?;
Ok::<_, Error>((node, resp))
});
let mut resps = call_futures.collect::<FuturesUnordered<_>>();
let mut errors = vec![];
@ -217,9 +211,9 @@ impl<F: TableFormat + 'static> Table<F> {
let hash = partition_key.hash();
let who = self
.system
.members
.read()
.await
.ring
.borrow()
.clone()
.walk_ring(&hash, self.param.replication_factor);
eprintln!("get who: {:?}", who);
@ -259,12 +253,9 @@ impl<F: TableFormat + 'static> Table<F> {
async fn repair_on_read(&self, who: &[UUID], what: &F::E) -> Result<(), Error> {
let what_enc = Arc::new(ByteBuf::from(rmp_to_vec_all_named(what)?));
self.rpc_try_call_many(&who[..],
&TableRPC::<F>::Update(vec![what_enc]),
who.len(),
)
self.rpc_try_call_many(&who[..], &TableRPC::<F>::Update(vec![what_enc]), who.len())
.await
.map(|_|())
.map(|_| ())
}
async fn rpc_try_call_many(

11
src/version_table.rs
View file

@ -69,14 +69,19 @@ impl TableFormat for VersionTable {
// Propagate deletion of version blocks
if let Some(old_v) = old {
if new.deleted && !old_v.deleted {
let deleted_block_refs = old_v.blocks.iter()
.map(|vb| BlockRef{
let deleted_block_refs = old_v
.blocks
.iter()
.map(|vb| BlockRef {
block: vb.hash.clone(),
version: old_v.uuid.clone(),
deleted: true,
})
.collect::<Vec<_>>();
garage.block_ref_table.insert_many(&deleted_block_refs[..]).await?;
garage
.block_ref_table
.insert_many(&deleted_block_refs[..])
.await?;
}
}
Ok(())