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-1,5 +1,26 @@ -/// This module defines fallible networks and their implementations. +//! This module defines connections and their implementations. + +use std::sync::Arc; + +use crate::{error::Result, message::Message}; pub mod quic; pub mod tcp; +/// Assertion that we are at _least_ running on a 32-bit system +/// TODO: find out if there is a better way than the `u32` cast +const _: [(); 0 - (!(usize::BITS >= u32::BITS)) as usize] = []; + +trait Connection { + /// Receive a single message from the connection. + /// + /// # Errors + /// Errors if we either fail to receive the message. This usually means a connection problem. + async fn recv_message(&self) -> Result; + + /// Send a single message over the connection. + /// + /// # Errors + /// Errors if we fail to deliver the message. This usually means a connection problem. + async fn send_message(&self, message: Arc) -> Result<()>; +} diff --git a/broker-proto/src/connection/fallible/quic.rs b/broker-proto/src/connection/fallible/quic.rs index e69de29..dffca0a 100644 --- a/broker-proto/src/connection/fallible/quic.rs +++ b/broker-proto/src/connection/fallible/quic.rs @@ -0,0 +1,117 @@ +//! This file defines and implements a thin wrapper around a QUIC +//! connection that implements our message framing and connection +//! logic. + +use crate::{ + bail, + error::{Error, Result}, + message::Message, + MAX_MESSAGE_SIZE, +}; +use core::hash::Hash; +use std::sync::Arc; + +use super::Connection; + +/// `Fallible` is a thin wrapper around `quinn::Connection` that implements +/// `Connection`. +#[derive(Clone)] +pub struct Fallible(pub quinn::Connection); + +/// `PartialEq` for a `Fallible` connection is determined by the `stable_id` since it +/// will not change for the duration of the connection. +impl PartialEq for Fallible { + fn eq(&self, other: &Self) -> bool { + self.0.stable_id() == other.0.stable_id() + } +} + +/// Assertion for `Fallible` that `PartialEq` == `Eq` +impl Eq for Fallible { + fn assert_receiver_is_total_eq(&self) {} +} + +/// `Hash` for a `Fallible` connection is determined by the `stable_id` since it +/// will not change for the duration of the connection. We just want to hash that. +impl Hash for Fallible { + fn hash(&self, state: &mut H) { + self.0.stable_id().hash(state); + } + + /// This just calls `hash` on each item in the slice. + fn hash_slice(data: &[Self], state: &mut H) + where + Self: Sized, + { + data.iter().for_each(|item| item.hash(state)); + } +} + +impl Connection for Fallible { + /// Receives a single message from the QUIC connection. Since we use + /// virtual streams as a message framing method, this function first accepts a stream + /// and then reads and deserializes a single message from it. + /// + /// # Errors + /// Errors if we either failed to accept the stream or receive the message over that stream. + /// This usually means a connection problem. + async fn recv_message(&self) -> Result { + // Accept the incoming unidirectional stream + let mut stream = bail!( + self.0.accept_uni().await, + ConnectionError, + "failed to accept unidirectional stream" + ); + + // Read the full message, until the sender closes the stream + let message_bytes = bail!( + stream.read_to_end(MAX_MESSAGE_SIZE as usize).await, + ConnectionError, + "failed to read from stream" + ); + + // Deserialize and return the message + Ok(bail!( + Message::deserialize(&message_bytes), + DeserializeError, + "failed to deserialize message" + )) + } + + /// Sends a single message to the QUIC connection. This function first opens a + /// stream and then serializes and sends a single message to it. + /// + /// # Errors + /// Errors if we either failed to open the stream or send the message over that stream. + /// This usually means a connection problem. + async fn send_message(&self, message: Arc) -> Result<()> { + // Open the outgoing unidirectional stream + let mut stream = bail!( + self.0.open_uni().await, + ConnectionError, + "failed to open unidirectional stream" + ); + + // Serialize the message + let message_bytes = bail!( + message.serialize(), + SerializeError, + "failed to serialize message" + ); + + // Write the full message to the stream + bail!( + stream.write_all(&message_bytes).await, + ConnectionError, + "failed to write to stream" + ); + + // Finish the stream, denoting to the peer that the + // message has been fully written + Ok(bail!( + stream.finish().await, + ConnectionError, + "failed to finish stream" + )) + } +} diff --git a/broker-proto/src/connection/fallible/tcp.rs b/broker-proto/src/connection/fallible/tcp.rs index e69de29..cc98749 100644 --- a/broker-proto/src/connection/fallible/tcp.rs +++ b/broker-proto/src/connection/fallible/tcp.rs @@ -0,0 +1,106 @@ +//! This file defines and implements a thin wrapper around a TCP +//! connection that implements our message framing and connection +//! logic. + +use tokio::{ + io::{AsyncReadExt, AsyncWriteExt}, + net::tcp::{OwnedReadHalf, OwnedWriteHalf}, + sync::Mutex, +}; + +use crate::{ + bail, + error::{Error, Result}, + message::Message, + MAX_MESSAGE_SIZE, +}; +use std::sync::Arc; + +use super::Connection; + +/// `Fallible` is a thin wrapper around `OwnedReadHalf` and `OwnedWriteHalf` that implements +/// `Connection`. +#[derive(Clone)] +pub struct Fallible { + pub receiver: Arc>, + pub sender: Arc>, +} + +impl Connection for Fallible { + /// Receives a single message from the TCP connection. It reads the size + /// of the message from the stream, reads the message, and then + /// deserializes and returns it. + /// + /// # Errors + /// Errors if we either failed to receive or deserialize the message. + /// This usually means a connection problem. + async fn recv_message(&self) -> Result { + // Lock the stream so we don't receive message/message sizes interleaved + let mut receiver_guard = self.receiver.lock().await; + + // Read the message size from the stream + let message_size = bail!( + receiver_guard.read_u32().await, + ConnectionError, + "failed to read message size" + ); + // Make sure the message isn't too big + if message_size > MAX_MESSAGE_SIZE { + return Err(Error::ConnectionError( + "expected to receive message that was too big".to_string(), + )); + } + + // Create buffer of the proper size + let mut buffer = vec![0; message_size as usize]; + // Read the message from the stream + bail!( + receiver_guard.read_exact(&mut buffer).await, + ConnectionError, + "failed to receive message from connection" + ); + + // Deserialize and return the message + Ok(bail!( + Message::deserialize(&buffer), + DeserializeError, + "failed to deserialize message" + )) + } + + /// Sends a single message to the QUIC connection. This function first opens a + /// stream and then serializes and sends a single message to it. + /// + /// # Errors + /// Errors if we either failed to open the stream or send the message over that stream. + /// This usually means a connection problem. + async fn send_message(&self, message: Arc) -> Result<()> { + // Lock the stream so we don't send message/message sizes interleaved + let mut sender_guard = self.sender.lock().await; + + // Serialize the message + let serialized_message = bail!( + message.serialize(), + SerializeError, + "failed to serialize message" + ); + + // Write the message size to the stream + bail!( + sender_guard + .write_u32(serialized_message.len() as u32) + .await, + ConnectionError, + "failed to send message size" + ); + + // Write the message to the stream + bail!( + sender_guard.write_all(&serialized_message).await, + ConnectionError, + "failed to send message" + ); + + Ok(()) + } +} diff --git a/broker-proto/src/connection/mod.rs b/broker-proto/src/connection/mod.rs index 6065758..853b749 100644 --- a/broker-proto/src/connection/mod.rs +++ b/broker-proto/src/connection/mod.rs @@ -1,4 +1,2 @@ -/// This module defines network connections, their types, and their implementations. - pub mod fallible; -pub mod infallible; +pub mod sticky; \ No newline at end of file diff --git a/broker-proto/src/connection/infallible.rs b/broker-proto/src/connection/sticky.rs similarity index 100% rename from broker-proto/src/connection/infallible.rs rename to broker-proto/src/connection/sticky.rs diff --git a/broker-proto/src/error.rs b/broker-proto/src/error.rs index 5123851..7f273ea 100644 --- a/broker-proto/src/error.rs +++ b/broker-proto/src/error.rs @@ -1,4 +1,4 @@ -/// This file defines common errors used by CDN clients and servers. +//! This file defines common errors used by CDN clients and servers. use core::result::Result as StdResult; use thiserror::Error; diff --git a/broker-proto/src/lib.rs b/broker-proto/src/lib.rs index e3db3a7..5822ac5 100644 --- a/broker-proto/src/lib.rs +++ b/broker-proto/src/lib.rs @@ -1,11 +1,30 @@ -/// This crate defines the common code structures used by both the -/// broker client and server. +//! This crate defines the common code structures and constants used by both the +//! broker client and server. pub mod connection; pub mod error; pub mod message; pub mod wal; +/// Common constants used in both the client and server +/// +/// The maximum message size to be received over a connection. +/// After this, it will be automatically closed by the receiver. +pub const MAX_MESSAGE_SIZE: u32 = 1024 * 1024 * 1024; + +/// The maximum amount of concurrent QUIC streams (messages) that can be opened. +/// Having a value that is too high can degrade performance. +pub const QUIC_MAX_CONCURRENT_STREAMS: u64 = 10; + +/// Specifies the number of subsequent connection failures before we try +/// to connect to the next server address, if applicable (we might be +/// using a single server address). +pub const SUBSEQUENT_CONNECTION_FAILURES_BEFORE_NEXT_ADDRESS: usize = 3; + +/// Specifies the number of subsequent operation (message send, authentication, etc) +/// failures before we try to reconnect to the current (or next) server. +pub const SUBSEQUENT_OPERATION_FAILURES_BEFORE_NEXT_RECONNECT: usize = 3; + /// Include the built capnp-rust bindings #[allow(clippy::all, clippy::pedantic, clippy::restriction, clippy::nursery)] pub mod messages_capnp { diff --git a/broker-proto/src/message.rs b/broker-proto/src/message.rs index e518879..f5f46be 100644 --- a/broker-proto/src/message.rs +++ b/broker-proto/src/message.rs @@ -1,6 +1,6 @@ -/// The message serialization and deserialization layer. Used by all -/// messages sent to/from a broker or user. -/// TODO: clean up. Maybe use Cap'n'Proto messages directly. +//! The message serialization and deserialization layer. Used by all +//! messages sent to/from a broker or user. +//! TODO: clean up. Maybe use Cap'n'Proto messages directly. use capnp::{ message::ReaderOptions, diff --git a/broker-proto/src/wal.rs b/broker-proto/src/wal.rs index f6a92be..8db1747 100644 --- a/broker-proto/src/wal.rs +++ b/broker-proto/src/wal.rs @@ -1,6 +1,6 @@ -/// This file defines a write-ahead log that we use for broker <-> broker replication. -/// It does not write to disk, but contains the primitive that allows us to -/// catch up from a snapshot or from a list of logs. +//! This file defines a write-ahead log that we use for broker <-> broker replication. +//! It does not write to disk, but contains the primitive that allows us to +//! catch up from a snapshot or from a list of logs. use std::{ collections::{HashSet, VecDeque},