garage-unix-socket/src/server.rs
Alex Auvolat 9c931f5eda Keep network status & ring in a tokio::sync::watch
advantages
- reads don't prevent preparing writes
- can be followed from other parts of the system by cloning the receiver
2020-04-11 23:53:32 +02:00

227 lines
5.6 KiB
Rust

pub use futures_util::future::FutureExt;
use serde::Deserialize;
use std::collections::HashMap;
use std::io::{Read, Write};
use std::net::SocketAddr;
use std::path::PathBuf;
use std::sync::Arc;
use tokio::sync::watch;
use tokio::sync::RwLock;
use crate::api_server;
use crate::background::*;
use crate::block::*;
use crate::data::*;
use crate::error::Error;
use crate::membership::System;
use crate::proto::*;
use crate::rpc_server;
use crate::table::*;
#[derive(Deserialize, Debug)]
pub struct Config {
pub metadata_dir: PathBuf,
pub data_dir: PathBuf,
pub api_port: u16,
pub rpc_port: u16,
pub bootstrap_peers: Vec<SocketAddr>,
#[serde(default = "default_block_size")]
pub block_size: usize,
#[serde(default = "default_replication_factor")]
pub meta_replication_factor: usize,
#[serde(default = "default_replication_factor")]
pub data_replication_factor: usize,
}
pub struct Garage {
pub db: sled::Db,
pub system: Arc<System>,
pub block_manager: BlockManager,
pub background: Arc<BackgroundRunner>,
pub table_rpc_handlers: HashMap<String, Box<dyn TableRpcHandler + Sync + Send>>,
pub object_table: Arc<Table<ObjectTable>>,
pub version_table: Arc<Table<VersionTable>>,
pub block_ref_table: Arc<Table<BlockRefTable>>,
}
impl Garage {
pub async fn new(
config: Config,
id: UUID,
db: sled::Db,
background: Arc<BackgroundRunner>,
) -> Arc<Self> {
let block_manager = BlockManager::new(&db, config.data_dir.clone());
let system = Arc::new(System::new(config, id, background.clone()));
let meta_rep_param = TableReplicationParams {
replication_factor: system.config.meta_replication_factor,
write_quorum: (system.config.meta_replication_factor + 1) / 2,
read_quorum: (system.config.meta_replication_factor + 1) / 2,
timeout: DEFAULT_TIMEOUT,
};
let object_table = Arc::new(Table::new(
ObjectTable {
garage: RwLock::new(None),
},
system.clone(),
&db,
"object".to_string(),
meta_rep_param.clone(),
));
let version_table = Arc::new(Table::new(
VersionTable {
garage: RwLock::new(None),
},
system.clone(),
&db,
"version".to_string(),
meta_rep_param.clone(),
));
let data_rep_param = TableReplicationParams {
replication_factor: system.config.data_replication_factor,
write_quorum: (system.config.data_replication_factor + 1) / 2,
read_quorum: 1,
timeout: DEFAULT_TIMEOUT,
};
let block_ref_table = Arc::new(Table::new(
BlockRefTable {
garage: RwLock::new(None),
},
system.clone(),
&db,
"block_ref".to_string(),
data_rep_param.clone(),
));
let mut garage = Self {
db,
system: system.clone(),
block_manager,
background,
table_rpc_handlers: HashMap::new(),
object_table,
version_table,
block_ref_table,
};
garage.table_rpc_handlers.insert(
garage.object_table.name.clone(),
garage.object_table.clone().rpc_handler(),
);
garage.table_rpc_handlers.insert(
garage.version_table.name.clone(),
garage.version_table.clone().rpc_handler(),
);
garage.table_rpc_handlers.insert(
garage.block_ref_table.name.clone(),
garage.block_ref_table.clone().rpc_handler(),
);
let garage = Arc::new(garage);
*garage.object_table.instance.garage.write().await = Some(garage.clone());
*garage.version_table.instance.garage.write().await = Some(garage.clone());
*garage.block_ref_table.instance.garage.write().await = Some(garage.clone());
garage
}
}
fn default_block_size() -> usize {
1048576
}
fn default_replication_factor() -> usize {
3
}
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.into())
} else {
let id = gen_uuid();
let mut f = std::fs::File::create(id_file.as_path())?;
f.write_all(id.as_slice())?;
Ok(id)
}
}
async fn shutdown_signal(send_cancel: watch::Sender<bool>) -> Result<(), Error> {
// 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.");
send_cancel.broadcast(true)?;
Ok(())
}
async fn wait_from(mut chan: watch::Receiver<bool>) -> () {
while let Some(exit_now) = chan.recv().await {
if exit_now {
return;
}
}
}
pub async fn run_server(config_file: PathBuf) -> Result<(), Error> {
let config = read_config(config_file).expect("Unable to read config file");
let mut db_path = config.metadata_dir.clone();
db_path.push("db");
let db = sled::open(db_path).expect("Unable to open DB");
let id = gen_node_id(&config.metadata_dir).expect("Unable to read or generate node ID");
println!("Node ID: {}", hex::encode(&id));
let (send_cancel, watch_cancel) = watch::channel(false);
let background = BackgroundRunner::new(8, watch_cancel.clone());
let garage = Garage::new(config, id, db, background.clone()).await;
let rpc_server = rpc_server::run_rpc_server(garage.clone(), wait_from(watch_cancel.clone()));
let api_server = api_server::run_api_server(garage.clone(), wait_from(watch_cancel.clone()));
futures::try_join!(
garage.system.clone().bootstrap().map(Ok),
rpc_server,
api_server,
background.run().map(Ok),
shutdown_signal(send_cancel),
)?;
Ok(())
}