melin-server-runtime 0.13.0

Application-agnostic server runtime with accept loop, journaling, replication, and optional DPDK transport
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

//! Application-agnostic LMAX-pipeline server runtime.
//!
//! Groups the application-agnostic parts of the Melin server: the
//! accept loop, frame reader, durability-policy wiring, admin
//! endpoint, replication, and the optional DPDK transport. Generic
//! over `A: Application` — the binary supplies a concrete app via
//! [`server::run`] (or [`server::run_dpdk`] under `feature = "dpdk"`) along with caller-supplied
//! `AppFactory`, `RequestDecoder`, `ResponseEncoder`, and event-
//! publisher fn.
//!
//! The trading-side wiring (`ServerApp`, `ExchangeRequestDecoder`,
//! `ExchangeResponseEncoder`, market-data firehose) lives in the
//! separate `melin-server` crate.

pub mod admin;
mod buf_ring;
mod client_frames;
pub mod durability_policy;
pub mod process;
pub mod promotion;
mod raft;
mod raft_promotion;
pub mod reader;
pub mod replication;
pub mod response;
pub mod server;

#[cfg(feature = "dpdk")]
pub mod dpdk_response;
#[cfg(feature = "dpdk")]
pub mod dpdk_transport;

/// Control-plane event the accept loop, reader, and response stage
/// exchange. Transport-agnostic — the payload is a socket fd + writer,
/// not an app event — so both build modes refer to the same type.
pub enum ControlEvent {
    Connected {
        connection_id: u64,
        fd: std::os::unix::io::RawFd,
        writer: melin_wire_protocol::blocking::BlockingFrameWriter<Box<dyn std::io::Write + Send>>,
    },
    Disconnected {
        connection_id: u64,
    },
    /// Reader → response: the input pipeline was full when this
    /// connection's frame arrived; deliver a `ServerBusy` notice through
    /// the normal egress path. Routed through the response stage so
    /// exactly one thread ever writes a client socket — a reader-side
    /// send could land between the two halves of a partially-flushed
    /// response frame and permanently desync the client's length-prefix
    /// framing (2026-08 io_uring audit, review finding F3).
    PipelineBusy {
        connection_id: u64,
    },
}