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Jane Lusby 2020-06-16 15:16:33 -07:00
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36
Cargo.toml Normal file
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@ -0,0 +1,36 @@
[package]
name = "zebra-network"
version = "0.1.0"
authors = ["Zcash Foundation <zebra@zfnd.org>"]
license = "MIT OR Apache-2.0"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
bitflags = "1.2"
byteorder = "1.3"
bytes = "0.5"
chrono = "0.4"
hex = "0.4"
# indexmap has rayon support for parallel iteration,
# which we don't use, so disable it to drop the dependencies.
indexmap = { version = "1.4", default-features = false }
pin-project = "0.4"
proptest = "0.10"
proptest-derive = "0.2.0"
rand = "0.7"
serde = { version = "1", features = ["serde_derive"] }
thiserror = "1"
tokio = { version = "0.2", features = ["net", "time", "stream"] }
tokio-util = { version = "0.2", features = ["codec"] }
futures = "0.3"
tracing = "0.1"
tracing-futures = "0.2"
tower = "0.3"
tower-load = "0.3"
metrics = "0.12"

7
proptest-regressions/protocol/external/types.txt vendored Normal file
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@ -0,0 +1,7 @@
# Seeds for failure cases proptest has generated in the past. It is
# automatically read and these particular cases re-run before any
# novel cases are generated.
#
# It is recommended to check this file in to source control so that
# everyone who runs the test benefits from these saved cases.
cc 1c86ac8e13c37c728a712e43a95610c77b1d51118eaac496f9a53862c0ed4ded # shrinks to data = [0, 0, 0, 0]

8
proptest-regressions/protocol/internal/request.txt Normal file
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@ -0,0 +1,8 @@
# Seeds for failure cases proptest has generated in the past. It is
# automatically read and these particular cases re-run before any
# novel cases are generated.
#
# It is recommended to check this file in to source control so that
# everyone who runs the test benefits from these saved cases.
cc fb728d0d2a16976de785ed8525cc74c4d3f7826f8840ebe5a4fee6b5ab0edad8 # shrinks to req = GetMempool
cc 3ed95f3a436a15e33b27f4bf1105629860b8e6a895165eb83befcb625e951b1d # shrinks to req = GetPeers

43
src/lib.rs Normal file
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@ -0,0 +1,43 @@
//! Networking code for Zebra. 🦓
//!
//! The Zcash network protocol is inherited from Bitcoin, which uses a
//! stateful network protocol in which messages can arrive in any
//! order (even before a handshake is complete!), and the same message
//! may be a request or a response depending on context.
//!
//! This crate translates the legacy Bitcoin/Zcash network protocol
//! into a stateless, request-response oriented protocol defined by
//! the [`Request`] and [`Response`] enums, and completely
//! encapsulates all peer handling code behind a single
//! [`tower::Service`] representing "the network" which load-balances
//! outbound [`Request`]s over available peers.
//!
//! Each peer connection is a distinct task, which interprets incoming
//! Bitcoin/Zcash messages either as [`Response`]s to pending
//! [`Request`]s, or as an inbound [`Request`]s to an internal
//! [`tower::Service`] representing "this node". All connection state
//! is isolated to the peer in question, so as a side effect the
//! design is structurally immune to the recent `ping` attack.
//!
//! Because [`tower::Service`]s provide backpressure information, we
//! can dynamically manage the size of the connection pool according
//! to inbound and outbound demand. The inbound service can shed load
//! when it is not ready for requests, causing those peer connections
//! to close, and the outbound service can connect to additional peers
//! when it is overloaded.
#![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
#![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_network")]
#![deny(missing_docs)]
// Tracing causes false positives on this lint:
// https://github.com/tokio-rs/tracing/issues/553
#![allow(clippy::cognitive_complexity, clippy::try_err, clippy::type_complexity)]
/// Type alias to make working with tower traits easier.
///
/// Note: the 'static lifetime bound means that the *type* cannot have any
/// non-'static lifetimes, (e.g., when a type contains a borrow and is
/// parameterized by 'a), *not* that the object itself has 'static lifetime.
pub type BoxedStdError = Box<dyn std::error::Error + Send + Sync + 'static>;
mod peer_set;

1
src/peer_set.rs Normal file
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@ -0,0 +1 @@
mod set;

44
src/peer_set/set.rs Normal file
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@ -0,0 +1,44 @@
use std::{
fmt::Debug,
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tower::{discover::Discover, Service};
use tower_load::Load;
use crate::BoxedStdError;
pub struct Request;
pub struct Response;
pub struct PeerSet<D>
where
D: Discover,
{
_discover: D,
}
impl<D> Service<Request> for PeerSet<D>
where
D: Discover + Unpin,
D::Key: Clone + Debug + ToString,
D::Service: Service<Request, Response = Response> + Load,
D::Error: Into<BoxedStdError>,
<D::Service as Service<Request>>::Error: Into<BoxedStdError> + 'static,
<D::Service as Service<Request>>::Future: Send + 'static,
<D::Service as Load>::Metric: Debug,
{
type Response = Response;
type Error = BoxedStdError;
type Future =
Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send + 'static>>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
todo!()
}
fn call(&mut self, _req: Request) -> Self::Future {
todo!()
}
}