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Enable maximum connections to be configured manually (#182)
* Enable maximum connections to be configured * Add arbiter for handling server startup * Add handling of maxcon for command-line args * Add changelog entry
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| * Created on Sat Jun 26 2021 | ||
| * | ||
| * This file is a part of Skytable | ||
| * Skytable (formerly known as TerrabaseDB or Skybase) is a free and open-source | ||
| * NoSQL database written by Sayan Nandan ("the Author") with the | ||
| * vision to provide flexibility in data modelling without compromising | ||
| * on performance, queryability or scalability. | ||
| * | ||
| * Copyright (c) 2021, Sayan Nandan <ohsayan@outlook.com> | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
|
||
| use crate::config::BGSave; | ||
| use crate::config::SnapshotConfig; | ||
| use crate::coredb::CoreDB; | ||
| use crate::dbnet::{self, Terminator}; | ||
| use crate::diskstore::snapshot::DIR_REMOTE_SNAPSHOT; | ||
| use crate::services; | ||
| use crate::PortConfig; | ||
| use std::fs; | ||
| use tokio::sync::broadcast; | ||
|
|
||
| #[cfg(unix)] | ||
| use core::{future::Future, pin::Pin, task::Context, task::Poll}; | ||
| #[cfg(unix)] | ||
| use tokio::signal::unix::{signal as fnsignal, Signal, SignalKind}; | ||
| #[cfg(unix)] | ||
| /// Object to bind to unix-specific signals | ||
| pub struct UnixTerminationSignal { | ||
| sigterm: Signal, | ||
| } | ||
|
|
||
| #[cfg(unix)] | ||
| impl UnixTerminationSignal { | ||
| pub fn init() -> Result<Self, String> { | ||
| let sigterm = fnsignal(SignalKind::terminate()) | ||
| .map_err(|e| format!("Failed to bind to signal with: {}", e))?; | ||
| Ok(Self { sigterm }) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(unix)] | ||
| impl Future for UnixTerminationSignal { | ||
| type Output = Option<()>; | ||
|
|
||
| fn poll(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<Self::Output> { | ||
| self.sigterm.poll_recv(ctx) | ||
| } | ||
| } | ||
|
|
||
| /// Start the server waiting for incoming connections or a termsig | ||
| pub async fn run( | ||
| ports: PortConfig, | ||
| bgsave_cfg: BGSave, | ||
| snapshot_cfg: SnapshotConfig, | ||
| restore_filepath: Option<String>, | ||
| maxcon: usize, | ||
| ) -> Result<CoreDB, String> { | ||
| // Intialize the broadcast channel | ||
| let (signal, _) = broadcast::channel(1); | ||
|
|
||
| // create the data directories and intialize the coredb | ||
| fs::create_dir_all(&*DIR_REMOTE_SNAPSHOT) | ||
| .map_err(|e| format!("Failed to create data directories: '{}'", e))?; | ||
| let db = CoreDB::new(&snapshot_cfg, restore_filepath) | ||
| .map_err(|e| format!("Error while initializing database: {}", e))?; | ||
|
|
||
| // initialize the background services | ||
| let bgsave_handle = tokio::spawn(services::bgsave::bgsave_scheduler( | ||
| db.clone(), | ||
| bgsave_cfg, | ||
| Terminator::new(signal.subscribe()), | ||
| )); | ||
| let snapshot_handle = tokio::spawn(services::snapshot::snapshot_service( | ||
| db.clone(), | ||
| snapshot_cfg, | ||
| Terminator::new(signal.subscribe()), | ||
| )); | ||
|
|
||
| // bind the ctrlc handler | ||
| let sig = tokio::signal::ctrl_c(); | ||
|
|
||
| // start the server (single or multiple listeners) | ||
| let mut server = dbnet::connect(ports, maxcon, db.clone(), signal.clone()).await?; | ||
|
|
||
| #[cfg(not(unix))] | ||
| { | ||
| // Non-unix, usually Windows specific signal handling. | ||
| // FIXME(@ohsayan): For now, let's just | ||
| // bother with ctrl+c, we'll move ahead as users require them | ||
| tokio::select! { | ||
| _ = server.run_server() => {} | ||
| _ = sig => {} | ||
| } | ||
| } | ||
| #[cfg(unix)] | ||
| { | ||
| let sigterm = UnixTerminationSignal::init()?; | ||
| // apart from CTRLC, the only other thing we care about is SIGTERM | ||
| // FIXME(@ohsayan): Maybe we should respond to SIGHUP too? | ||
| tokio::select! { | ||
| _ = server.run_server() => {}, | ||
| _ = sig => {}, | ||
| _ = sigterm => {} | ||
| } | ||
| } | ||
|
|
||
| log::info!("Signalling all workers to shut down"); | ||
| // drop the signal and let others exit | ||
| drop(signal); | ||
| server.finish_with_termsig().await; | ||
|
|
||
| // wait for the background services to terminate | ||
| let _ = snapshot_handle.await; | ||
| let _ = bgsave_handle.await; | ||
| Ok(db) | ||
| } |
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