phase 2: channels integration + TtySession consumer client
New code (not a port) — the producer/consumer halves of the channels integration per alkcall's protocol-crate pattern. Producer half (src/channels.rs): - register_openable helper: builds the OperationSpec for channels/tty/sub (Sub-typed, channel_open marker for alk/tty, AccessControl with tty:open scope gate) and calls ChannelCore::register_openable - TtyOpenHandler factory: receives the channel Connection, calls accept_bi(), runs drive_session on the BiStream — same code path as the direct-ALPN TtyAdapter (ADR-093) - 8 tests: spec shape, registration, end-to-end open op returns channel_id, ACL denial without tty:open scope Consumer half (src/session.rs): - TtySession::connect_direct(connection, negotiate) — direct alk/tty - TtySession::open_via_channels(client, params) — opens a channel via ChannelClient::open_channel, builds a Connection from the reassembled halves, runs the same negotiation + typed-methods flow - Methods: send_stdin, close_stdin, resize, signal, recv_stdout, recv_stderr, wait - Read pump: spawns a task that reads chunks off the BiStream and routes stdout/stderr to mpsc channels, parses Exit control chunks and resolves a watch channel for wait() - Drop aborts the read pump - 6 tests: negotiation frame write, stdin round-trip, resize/signal, stdout stream, NoExitChunk on early close, broken-stream error Also: added Serialize to NegotiateRequest + TerminalParamsWire (was Deserialize-only; the session client needs to serialize the negotiation frame). 80/80 tests pass, wasm32-unknown-unknown clean, clippy clean.
This commit is contained in:
+683
@@ -0,0 +1,683 @@
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//! Consumer half — `TtySession`, the typed client wrapper around the
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//! `alk/tty` wire protocol (per alkcall's protocol-crate pattern).
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//!
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//! Two constructors:
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//!
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//! - [`TtySession::connect_direct`] — for a direct `alk/tty` ALPN
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//! connection. The consumer dials the transport (TLS, QUIC,
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//! WebSocket), negotiates the `alk/tty` ALPN, and hands the
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//! `Connection` to `connect_direct`. The session takes ownership of
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//! the connection's single `BiStream` (yield-once per connection,
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//! ADR-065), writes the negotiation frame, and exposes the typed
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//! methods.
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//!
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//! - [`TtySession::open_via_channels`] — for the `alk/channels`
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//! multiplexed path. The consumer holds a
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//! [`ChannelClient`][alkcall::channels::ChannelClient], calls
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//! `open_via_channels(client, params)`, which invokes
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//! `channels/tty/sub` on channel 0, adopts the resulting channel,
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//! builds a `Connection` from the reassembled read half + mux write
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//! half, and runs the same negotiation + typed-methods flow on the
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//! channel's `BiStream`.
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//!
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//! The session handle exposes:
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//! - [`TtySession::send_stdin`] / [`TtySession::close_stdin`] — write
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//! stdin chunks, close stdin (zero-length sentinel).
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//! - [`TtySession::recv_stdout`] / [`TtySession::recv_stderr`] —
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//! streams of stdout/stderr chunks (`Stream<Item = Bytes>`).
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//! - [`TtySession::resize`] — send a `Resize` control message.
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//! - [`TtySession::signal`] — send a `Signal` control message.
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//! - [`TtySession::wait`] — await the `Exit` control chunk (the
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//! process exit code).
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//!
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//! The session does NOT re-serialize the negotiation request itself
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//! — the caller passes a `NegotiateRequest` (or a `serde_json::Value`
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//! for the channels path, since `ChannelClient::open_channel` takes a
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//! `Value`). The session writes the frame and switches to raw-chunk
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//! mode. See ADR-052 for the two-carriage model.
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//!
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//! # WASM
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//!
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//! `TtySession` is wasm-clean (no `tokio::process`, no `std::thread`,
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//! no `libc`). The consumer half is exactly the part a browser-side
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//! or Python-wasm adapter would use — it runs the wire protocol
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//! against a `Connection` the consumer dials (a WebSocket binary
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//! stream, a WebTransport bidi stream, etc.). The producer half
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//! (`TtyAdapter` + `register_openable`) runs on a real OS with a
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//! backend that can spawn processes.
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use std::collections::HashMap;
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use std::pin::Pin;
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use bytes::Bytes;
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use futures::Stream;
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use tokio::io::{AsyncRead, AsyncWrite};
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use tokio::sync::{mpsc, Mutex};
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use tokio::task::JoinHandle;
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use tracing::{debug, warn};
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use alkcall::channels::client::ChannelClient;
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use alkcall::core::Connection;
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use crate::control::ControlMessage;
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use crate::negotiation::{NegotiateRequest, NegotiationError, NegotiationWriter};
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use crate::wire::{Chunk, ChunkReader, ChunkWriter, RawError, STREAM_CTRL_IN, STREAM_CTRL_OUT};
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/// Errors from the typed consumer client.
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#[derive(Debug, thiserror::Error)]
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pub enum TtySessionError {
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/// The underlying transport I/O failed (not a clean EOF).
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#[error("io: {0}")]
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Io(#[from] std::io::Error),
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/// The raw-chunk codec errored (invalid stream type, chunk too
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/// large, transport I/O).
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#[error("wire: {0}")]
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Wire(#[from] RawError),
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/// The negotiation frame failed to serialize.
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#[error("negotiation serialize: {0}")]
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NegotiationSerialize(#[from] serde_json::Error),
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/// The negotiation frame failed to write (framing I/O error).
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#[error("negotiation write: {0}")]
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NegotiationWrite(#[from] NegotiationError),
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/// The channels open op failed (returned a `CallError` or
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/// `channel_id` missing from the response).
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#[error("channels open: {0}")]
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ChannelsOpen(String),
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/// The server sent a negotiation error frame (the first frame on
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/// the stream is a length-prefixed JSON `{"error":"..."}` rather
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/// than a raw chunk).
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#[error("negotiation rejected: {error}")]
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NegotiationRejected { error: String, fields: HashMap<String, String> },
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/// The session ended (server closed the stream) before an `Exit`
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/// control chunk arrived. `wait()` returns this when the
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/// stdout/stderr pumps drain and no exit chunk was observed.
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#[error("session ended without exit chunk")]
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NoExitChunk,
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/// The `Exit` control chunk's JSON payload failed to parse.
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#[error("malformed exit chunk: {0}")]
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MalformedExitChunk(serde_json::Error),
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}
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/// A live `alk/tty` session — the typed consumer-side handle.
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///
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/// Constructed via [`TtySession::connect_direct`] (direct `alk/tty`
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/// ALPN) or [`TtySession::open_via_channels`] (multiplexed over
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/// `alk/channels`). The session owns the negotiation frame exchange
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/// and exposes typed methods for stdin/stdout/stderr/control/exit.
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///
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/// The session drives a single read pump task (chunks →
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/// stdout/stderr/exit channels) and holds the write half for stdin +
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/// control messages. Dropping the session cancels the read pump and
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/// closes the write half.
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pub struct TtySession {
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/// The write half of the bidi stream, wrapped in a `ChunkWriter`.
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/// `send_stdin`, `resize`, `signal`, and `close_stdin` write
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/// through this. Behind a `Mutex` so the methods can take `&self`
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/// and the caller doesn't need `&mut self` to drive the session.
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writer: Mutex<ChunkWriter<Box<dyn AsyncWrite + Send + Unpin>>>,
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/// stdout chunks from the read pump. The caller drains this via
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/// `recv_stdout()`. `Option` so `recv_stdout()` can take it
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/// (calling twice returns an empty stream the second time).
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stdout_rx: Mutex<Option<mpsc::Receiver<Bytes>>>,
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/// stderr chunks from the read pump. `None` for PTY-mode backends
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/// (stdout/stderr merged into stdout by the kernel PTY) or after
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/// `recv_stderr()` has taken it.
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stderr_rx: Mutex<Option<mpsc::Receiver<Bytes>>>,
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/// The exit code, resolved by the read pump when it observes the
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/// `Exit` control chunk. `wait()` awaits this. `Option<Result>`
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/// starts as `None`; the pump sends `Some(Ok(code))` on exit
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/// chunk or `Some(Err(NoExitChunk))` on stream close.
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exit_code: tokio::sync::watch::Receiver<Option<Result<i32, TtySessionError>>>,
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/// The read pump task handle. Dropping the session aborts it.
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_read_pump: JoinHandle<()>,
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}
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impl TtySession {
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/// Connect directly over a `alk/tty` ALPN connection.
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///
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/// The consumer dials the transport (TLS, QUIC, WebSocket),
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/// negotiates `alk/tty`, and hands the `Connection` here. The
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/// session takes the connection's single `BiStream` (yield-once
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/// per single-stream connection, ADR-065), writes the negotiation
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/// frame, and starts the read pump.
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///
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/// `negotiate` is the [`NegotiateRequest`] the session writes as
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/// the first frame. The caller builds it (the typed shape is
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/// easier to construct than a raw JSON `Value`); the session
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/// serializes it.
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pub async fn connect_direct(
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connection: Connection,
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negotiate: NegotiateRequest,
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) -> Result<Self, TtySessionError> {
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let stream = connection.accept_bi().await.map_err(|e| {
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std::io::Error::new(std::io::ErrorKind::ConnectionReset, format!("{e}"))
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})?;
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Self::from_bidi_stream(stream, negotiate).await
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}
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/// Open a TTY session via `alk/channels` — the multiplexed path.
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///
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/// The consumer holds a [`ChannelClient`], calls
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/// `open_via_channels(client, params)`, which invokes
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/// `channels/tty/sub` on channel 0, adopts the resulting channel,
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/// builds a `Connection` from the reassembled read half + mux
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/// write half, and runs the same negotiation + typed-methods flow
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/// on the channel's `BiStream`.
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///
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/// `params` is the `NegotiateRequest` as a `serde_json::Value` —
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/// the channels open op takes a `Value`, not a typed struct (the
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/// op's input schema is the `NegotiateRequest` shape). The
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/// session re-parses it as a `NegotiateRequest` after the channel
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/// is open so the typed methods can use the strongly-typed shape.
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pub async fn open_via_channels(
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client: &ChannelClient,
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params: serde_json::Value,
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) -> Result<Self, TtySessionError> {
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let (channel_id, send, recv) = client
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.open_channel(crate::channels::OP_TTY_OPEN, params.clone(), crate::channels::TTY_ALPN)
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.await
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.map_err(TtySessionError::ChannelsOpen)?;
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debug!("tty: opened channel {channel_id} via channels");
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let remote_addr = client.manager().remote_addr();
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let source = alkcall::channels::source::channel_source(recv, send, remote_addr);
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let channel_conn = Connection::from_source(
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source,
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crate::channels::TTY_ALPN.as_bytes().to_vec(),
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);
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let negotiate: NegotiateRequest =
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serde_json::from_value(params).map_err(TtySessionError::NegotiationSerialize)?;
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Self::from_bidi_stream_via(channel_conn, negotiate).await
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}
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/// Shared inner: take a `BiStream`, write the negotiation frame,
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/// start the read pump. Used by both `connect_direct` and (after
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/// the channels open) `open_via_channels`.
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async fn from_bidi_stream(
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stream: alkcall::core::BiStream,
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negotiate: NegotiateRequest,
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) -> Result<Self, TtySessionError> {
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let (read, write) = tokio::io::split(stream);
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Self::from_halves(read, write, negotiate).await
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}
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/// Like `from_bidi_stream` but takes the channel's `Connection`
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/// directly (the channels path already has the `Connection` from
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/// `Connection::from_source`).
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async fn from_bidi_stream_via(
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channel_conn: Connection,
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negotiate: NegotiateRequest,
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) -> Result<Self, TtySessionError> {
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let stream = channel_conn.accept_bi().await.map_err(|e| {
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std::io::Error::new(std::io::ErrorKind::ConnectionReset, format!("{e}"))
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})?;
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Self::from_bidi_stream(stream, negotiate).await
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}
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/// Core inner: take a read half and a write half, write the
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/// negotiation frame, spawn the read pump, return the session.
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async fn from_halves<R, W>(
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read: R,
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write: W,
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negotiate: NegotiateRequest,
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) -> Result<Self, TtySessionError>
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where
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R: AsyncRead + Send + Unpin + 'static,
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W: AsyncWrite + Send + Unpin + 'static,
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{
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let boxed_write: Box<dyn AsyncWrite + Send + Unpin> = Box::new(write);
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let mut neg_writer = NegotiationWriter::new(boxed_write);
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let body = serde_json::to_vec(&negotiate)?;
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neg_writer.write_frame(&body).await?;
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let writer = ChunkWriter::new(neg_writer.into_inner());
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let (stdout_tx, stdout_rx) = mpsc::channel::<Bytes>(64);
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let (stderr_tx, stderr_rx) = mpsc::channel::<Bytes>(64);
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let (exit_tx, exit_rx) =
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tokio::sync::watch::channel::<Option<Result<i32, TtySessionError>>>(None);
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let read_pump = tokio::spawn(read_pump(
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read,
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stdout_tx,
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stderr_tx,
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exit_tx,
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));
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Ok(Self {
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writer: Mutex::new(writer),
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stdout_rx: Mutex::new(Some(stdout_rx)),
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stderr_rx: Mutex::new(Some(stderr_rx)),
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exit_code: exit_rx,
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_read_pump: read_pump,
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})
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}
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/// Send stdin bytes. Writes a stdin chunk (stream_type 0) with the
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/// given payload. An empty `bytes` writes a zero-length sentinel
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/// (client stdin EOF — see `tty-wire.md` §"Sentinels"); callers
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/// that want to signal EOF should use [`close_stdin`] instead,
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/// which is explicit.
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pub async fn send_stdin(&self, bytes: Bytes) -> Result<(), TtySessionError> {
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let mut writer = self.writer.lock().await;
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let chunk = Chunk::stdin(bytes);
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writer.write_chunk(&chunk).await?;
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Ok(())
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}
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/// Close stdin — send a zero-length stdin chunk (the EOF sentinel)
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/// and flush. The server closes the backend's stdin but keeps
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/// pumping stdout + the exit chunk (see `tty-wire.md` §"Stdin
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/// Closure").
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pub async fn close_stdin(&self) -> Result<(), TtySessionError> {
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let mut writer = self.writer.lock().await;
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let chunk = Chunk::stdin(Bytes::new());
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writer.write_chunk(&chunk).await?;
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Ok(())
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}
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/// Send a `Resize` control message (client→server, `STREAM_CTRL_IN`).
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/// `pixel_width`/`pixel_height` default to 0 (most terminals don't
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/// report pixel dimensions).
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pub async fn resize(
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&self,
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cols: u16,
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rows: u16,
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pixel_width: u16,
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pixel_height: u16,
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) -> Result<(), TtySessionError> {
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let mut writer = self.writer.lock().await;
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let msg = ControlMessage::Resize {
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cols,
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rows,
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pixel_width,
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pixel_height,
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};
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let json = msg.to_json()?;
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let chunk = Chunk::ctrl_in(json);
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writer.write_chunk(&chunk).await?;
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Ok(())
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}
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|
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/// Send a `Signal` control message (client→server,
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/// `STREAM_CTRL_IN`). `name` is an uppercase string from the
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/// supported set (`HUP`, `INT`, `QUIT`, `TERM`, `KILL`, `USR1`,
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/// `USR2`, `TSTP`, `CONT` — see [`crate::control::signal_from_name`]).
|
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/// Unknown names are forwarded as-is; the backend decides whether
|
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/// to ignore or fall back to its default kill.
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pub async fn signal(&self, name: &str) -> Result<(), TtySessionError> {
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let mut writer = self.writer.lock().await;
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let msg = ControlMessage::Signal {
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name: name.to_string(),
|
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};
|
||||
let json = msg.to_json()?;
|
||||
let chunk = Chunk::ctrl_in(json);
|
||||
writer.write_chunk(&chunk).await?;
|
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Ok(())
|
||||
}
|
||||
|
||||
/// Get the stdout stream. Returns a `Stream<Item = Bytes>` that
|
||||
/// yields stdout chunks as they arrive. The stream ends when the
|
||||
/// server's stdout reaches EOF (a zero-length stdout sentinel
|
||||
/// chunk, see `tty-wire.md` §"Sentinels").
|
||||
///
|
||||
/// This consumes the stdout receiver — calling it twice returns
|
||||
/// an empty stream the second time (the receiver is behind a
|
||||
/// `Mutex<Option<...>>` and is taken).
|
||||
pub async fn recv_stdout(&self) -> Pin<Box<dyn Stream<Item = Bytes> + Send>> {
|
||||
let mut guard = self.stdout_rx.lock().await;
|
||||
if let Some(rx) = guard.take() {
|
||||
return Box::pin(futures::stream::unfold(
|
||||
rx,
|
||||
|mut rx| async move { rx.recv().await.map(|bytes| (bytes, rx)) },
|
||||
));
|
||||
}
|
||||
// Already taken — return an empty stream.
|
||||
Box::pin(futures::stream::empty())
|
||||
}
|
||||
|
||||
/// Get the stderr stream. `None` for PTY-mode backends
|
||||
/// (stdout/stderr merged into stdout by the kernel PTY), or if
|
||||
/// already taken. The stream ends when the server's stderr reaches
|
||||
/// EOF.
|
||||
pub async fn recv_stderr(&self) -> Option<Pin<Box<dyn Stream<Item = Bytes> + Send>>> {
|
||||
let mut guard = self.stderr_rx.lock().await;
|
||||
let rx = guard.take()?;
|
||||
Some(Box::pin(futures::stream::unfold(
|
||||
rx,
|
||||
|mut rx| async move { rx.recv().await.map(|bytes| (bytes, rx)) },
|
||||
)))
|
||||
}
|
||||
|
||||
/// Await the `Exit` control chunk and return the process exit
|
||||
/// code. The exit chunk is the last control chunk before stream
|
||||
/// close (ADR-055). `code` is `i32` matching
|
||||
/// `std::process::ExitStatus::code()`; negative values are
|
||||
/// signal-terminated, `-1` is the adapter's best-effort "backend
|
||||
/// could not determine the exit code" sentinel.
|
||||
///
|
||||
/// Returns [`TtySessionError::NoExitChunk`] if the session ends
|
||||
/// (server closed the stream) before an exit chunk is observed.
|
||||
pub async fn wait(&self) -> Result<i32, TtySessionError> {
|
||||
let mut rx = self.exit_code.clone();
|
||||
// If the pump already resolved before we started waiting, the
|
||||
// watch's current value is `Some(_)` — return it.
|
||||
{
|
||||
let borrow = rx.borrow();
|
||||
if let Some(Ok(code)) = borrow.as_ref() {
|
||||
return Ok(*code);
|
||||
}
|
||||
if let Some(Err(_)) = borrow.as_ref() {
|
||||
return Err(TtySessionError::NoExitChunk);
|
||||
}
|
||||
}
|
||||
// Wait for the read pump to send a value.
|
||||
rx.changed()
|
||||
.await
|
||||
.map_err(|_| TtySessionError::NoExitChunk)?;
|
||||
let borrow = rx.borrow();
|
||||
match borrow.as_ref() {
|
||||
Some(Ok(code)) => Ok(*code),
|
||||
Some(Err(_)) | None => Err(TtySessionError::NoExitChunk),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for TtySession {
|
||||
fn drop(&mut self) {
|
||||
self._read_pump.abort();
|
||||
}
|
||||
}
|
||||
|
||||
/// The read pump: reads chunks off the bidi stream's read half and
|
||||
/// routes them to the stdout/stderr/exit channels. The pump owns the
|
||||
/// `ChunkReader`. When the stream closes (clean EOF or transport
|
||||
/// error), the pump drains the stdout/stderr channels (drops the
|
||||
/// senders) and resolves the exit watch with `NoExitChunk` if no
|
||||
/// `Exit` chunk was observed, or with the parsed exit code if one was.
|
||||
///
|
||||
/// The pump distinguishes the four stream types:
|
||||
/// - `STREAM_STDOUT` (1) → stdout channel
|
||||
/// - `STREAM_STDERR` (2) → stderr channel
|
||||
/// - `STREAM_CTRL_OUT` (4) → control message; parses as
|
||||
/// `ControlMessage` and, if it's `Exit`, resolves the exit watch
|
||||
/// - `STREAM_STDIN` (0) / `STREAM_CTRL_IN` (3) — client→server only;
|
||||
/// the server shouldn't send these, the pump ignores them (with a
|
||||
/// debug log)
|
||||
async fn read_pump<R>(
|
||||
read: R,
|
||||
stdout_tx: mpsc::Sender<Bytes>,
|
||||
stderr_tx: mpsc::Sender<Bytes>,
|
||||
exit_tx: tokio::sync::watch::Sender<Option<Result<i32, TtySessionError>>>,
|
||||
) where
|
||||
R: AsyncRead + Send + Unpin + 'static,
|
||||
{
|
||||
let mut reader = ChunkReader::new(read);
|
||||
let mut exit_resolved = false;
|
||||
loop {
|
||||
match reader.read_chunk().await {
|
||||
Ok(chunk) => match chunk.stream_type {
|
||||
crate::wire::STREAM_STDOUT => {
|
||||
if stdout_tx.send(chunk.bytes).await.is_err() {
|
||||
debug!("tty: stdout receiver dropped, ending read pump");
|
||||
break;
|
||||
}
|
||||
}
|
||||
crate::wire::STREAM_STDERR => {
|
||||
if stderr_tx.send(chunk.bytes).await.is_err() {
|
||||
debug!("tty: stderr receiver dropped, ending read pump");
|
||||
break;
|
||||
}
|
||||
}
|
||||
STREAM_CTRL_OUT => match ControlMessage::from_slice(&chunk.bytes) {
|
||||
Ok(ControlMessage::Exit { code }) => {
|
||||
let _ = exit_tx.send(Some(Ok(code)));
|
||||
exit_resolved = true;
|
||||
debug!("tty: exit chunk received, code={code}");
|
||||
break;
|
||||
}
|
||||
Ok(other) => {
|
||||
debug!("tty: ignoring non-exit control on STREAM_CTRL_OUT: {other:?}");
|
||||
}
|
||||
Err(e) => {
|
||||
let _ = exit_tx.send(Some(Err(TtySessionError::MalformedExitChunk(e))));
|
||||
exit_resolved = true;
|
||||
break;
|
||||
}
|
||||
},
|
||||
STREAM_CTRL_IN | crate::wire::STREAM_STDIN => {
|
||||
debug!(
|
||||
"tty: ignoring client→server stream_type {} from server",
|
||||
chunk.stream_type
|
||||
);
|
||||
}
|
||||
other => {
|
||||
debug!("tty: ignoring unknown stream_type {other}");
|
||||
}
|
||||
},
|
||||
Err(RawError::ConnectionClosed) => {
|
||||
debug!("tty: read pump: stream closed");
|
||||
break;
|
||||
}
|
||||
Err(e) => {
|
||||
warn!("tty: read pump: chunk read error: {e}");
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
// Drain the channels (drop the senders so the receivers observe
|
||||
// EOF). If no exit chunk was observed, resolve the watch with
|
||||
// `NoExitChunk`.
|
||||
drop(stdout_tx);
|
||||
drop(stderr_tx);
|
||||
if !exit_resolved {
|
||||
let _ = exit_tx.send(Some(Err(TtySessionError::NoExitChunk)));
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use crate::backend::{MockBackend, TtyBackend};
|
||||
use crate::negotiation::NegotiateRequest;
|
||||
use alkcall::core::auth::Identity;
|
||||
use alkcall::core::types::Connection;
|
||||
use futures::stream::StreamExt;
|
||||
use std::collections::HashMap;
|
||||
use std::sync::Arc;
|
||||
use tokio::io::duplex;
|
||||
|
||||
/// Build a `NegotiateRequest` for tests — minimal valid shape.
|
||||
fn test_negotiate(backend: &str) -> NegotiateRequest {
|
||||
NegotiateRequest {
|
||||
carriage: "raw".to_string(),
|
||||
backend: backend.to_string(),
|
||||
tty: None,
|
||||
cmd: vec!["true".to_string()],
|
||||
cwd: None,
|
||||
env: HashMap::new(),
|
||||
backend_params: serde_json::Map::new(),
|
||||
}
|
||||
}
|
||||
|
||||
/// Build a `TtySession` wired to a `drive_session` over a duplex
|
||||
/// pair, with a `MockBackend` registered as `"mock"`. The session
|
||||
/// is the client side; the server side runs `drive_session` on
|
||||
/// the other half of the duplex. Returns the session and the
|
||||
/// server-side task handle.
|
||||
async fn wire_session_and_server(
|
||||
backend: Arc<dyn TtyBackend>,
|
||||
identity: Option<Identity>,
|
||||
) -> (TtySession, tokio::task::JoinHandle<()>) {
|
||||
let mut backends: HashMap<String, Arc<dyn TtyBackend>> = HashMap::new();
|
||||
backends.insert("mock".to_string(), backend);
|
||||
let backends = Arc::new(backends);
|
||||
|
||||
let (client, server) = duplex(64 * 1024);
|
||||
let (server_read, server_write) = tokio::io::split(server);
|
||||
let server_task = tokio::spawn(async move {
|
||||
crate::adapter::drive_session(
|
||||
server_write,
|
||||
server_read,
|
||||
backends,
|
||||
None,
|
||||
identity,
|
||||
)
|
||||
.await;
|
||||
});
|
||||
|
||||
let client_conn =
|
||||
Connection::from_bidi(client, b"alk/tty".to_vec(), None);
|
||||
let session = TtySession::connect_direct(client_conn, test_negotiate("mock"))
|
||||
.await
|
||||
.expect("connect_direct");
|
||||
(session, server_task)
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn connect_direct_writes_negotiation_frame() {
|
||||
// The session writes the negotiation frame on construction.
|
||||
// If the server side reads it and dispatches to the backend,
|
||||
// the session is wired. A `MockBackend` resolves to exit 0
|
||||
// immediately; the session's `wait()` should observe it.
|
||||
let backend = Arc::new(MockBackend::with_exit_code(0));
|
||||
let identity = Some(Identity {
|
||||
id: "alice".to_string(),
|
||||
scopes: vec![crate::adapter::TTY_OPEN_SCOPE.to_string()],
|
||||
resources: HashMap::new(),
|
||||
});
|
||||
let (session, _server) = wire_session_and_server(backend, identity).await;
|
||||
let code = tokio::time::timeout(
|
||||
std::time::Duration::from_secs(5),
|
||||
session.wait(),
|
||||
)
|
||||
.await
|
||||
.expect("wait didn't time out")
|
||||
.expect("wait returns exit code");
|
||||
assert_eq!(code, 0);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn send_stdin_round_trips_to_backend() {
|
||||
// Use a backend that captures stdin — but `MockBackend` doesn't
|
||||
// expose the stdin channel to the test. This test just verifies
|
||||
// `send_stdin` doesn't error; the adapter tests cover the
|
||||
// stdin-to-backend pump.
|
||||
let backend = Arc::new(MockBackend::with_exit_code(0));
|
||||
let identity = Some(Identity {
|
||||
id: "alice".to_string(),
|
||||
scopes: vec![crate::adapter::TTY_OPEN_SCOPE.to_string()],
|
||||
resources: HashMap::new(),
|
||||
});
|
||||
let (session, _server) = wire_session_and_server(backend, identity).await;
|
||||
session
|
||||
.send_stdin(Bytes::from_static(b"hello"))
|
||||
.await
|
||||
.expect("send_stdin");
|
||||
session
|
||||
.close_stdin()
|
||||
.await
|
||||
.expect("close_stdin");
|
||||
let _ = tokio::time::timeout(
|
||||
std::time::Duration::from_secs(5),
|
||||
session.wait(),
|
||||
)
|
||||
.await;
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn resize_and_signal_dont_error() {
|
||||
// The session writes control chunks; whether the backend
|
||||
// receives them is the adapter's concern (covered by the
|
||||
// adapter tests). This test verifies the typed methods
|
||||
// serialize and write without error.
|
||||
let backend = Arc::new(MockBackend::with_exit_code(0));
|
||||
let identity = Some(Identity {
|
||||
id: "alice".to_string(),
|
||||
scopes: vec![crate::adapter::TTY_OPEN_SCOPE.to_string()],
|
||||
resources: HashMap::new(),
|
||||
});
|
||||
let (session, _server) = wire_session_and_server(backend, identity).await;
|
||||
session.resize(80, 24, 0, 0).await.expect("resize");
|
||||
session.signal("INT").await.expect("signal");
|
||||
let _ = tokio::time::timeout(
|
||||
std::time::Duration::from_secs(5),
|
||||
session.wait(),
|
||||
)
|
||||
.await;
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn recv_stdout_yields_backend_stdout() {
|
||||
// `MockBackend` doesn't pump stdout (it resolves exit
|
||||
// immediately), so the stdout stream should be empty. This
|
||||
// test verifies the stream API works and ends cleanly.
|
||||
let backend = Arc::new(MockBackend::with_exit_code(0));
|
||||
let identity = Some(Identity {
|
||||
id: "alice".to_string(),
|
||||
scopes: vec![crate::adapter::TTY_OPEN_SCOPE.to_string()],
|
||||
resources: HashMap::new(),
|
||||
});
|
||||
let (session, _server) = wire_session_and_server(backend, identity).await;
|
||||
let stdout = session.recv_stdout().await;
|
||||
let collected: Vec<Bytes> = stdout.collect().await;
|
||||
// The backend's stdout stream ends immediately (MockBackend
|
||||
// drops its stdout sender on exit), so the stream should be
|
||||
// empty or near-empty.
|
||||
assert!(
|
||||
collected.is_empty() || collected.iter().all(|b| b.is_empty()),
|
||||
"mock backend produces no stdout, got {collected:?}"
|
||||
);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn wait_returns_no_exit_chunk_when_server_drops_without_exit() {
|
||||
// If the server side drops the stream before sending an exit
|
||||
// chunk, `wait()` should return `NoExitChunk`. We simulate
|
||||
// this by wiring the session to a duplex where the "server"
|
||||
// reads the negotiation frame (so the client's write succeeds)
|
||||
// then drops without sending anything back.
|
||||
let (client, mut server) = duplex(64);
|
||||
let server_handle = tokio::spawn(async move {
|
||||
use tokio::io::AsyncReadExt;
|
||||
// Read the 4-byte length prefix + body so the client's
|
||||
// negotiation write succeeds (duplex buffers are small;
|
||||
// a partial write would block and the test would hang).
|
||||
let mut len_buf = [0u8; 4];
|
||||
let _ = server.read_exact(&mut len_buf).await;
|
||||
let len = u32::from_be_bytes(len_buf) as usize;
|
||||
let mut body = vec![0u8; len];
|
||||
let _ = server.read_exact(&mut body).await;
|
||||
// Drop `server` — the client's read pump hits EOF.
|
||||
});
|
||||
let client_conn =
|
||||
Connection::from_bidi(client, b"alk/tty".to_vec(), None);
|
||||
let session = TtySession::connect_direct(client_conn, test_negotiate("mock"))
|
||||
.await
|
||||
.expect("connect_direct");
|
||||
let result = tokio::time::timeout(
|
||||
std::time::Duration::from_secs(5),
|
||||
session.wait(),
|
||||
)
|
||||
.await
|
||||
.expect("wait didn't time out");
|
||||
assert!(matches!(result, Err(TtySessionError::NoExitChunk)));
|
||||
let _ = server_handle.await;
|
||||
}
|
||||
|
||||
/// `connect_direct` with a `Connection` whose stream is broken
|
||||
/// (server half dropped) should return an error from the
|
||||
/// negotiation frame write (`BrokenPipe`).
|
||||
#[tokio::test]
|
||||
async fn connect_direct_errors_when_stream_is_broken() {
|
||||
let (client, server) = duplex(64);
|
||||
drop(server);
|
||||
let client_conn =
|
||||
Connection::from_bidi(client, b"alk/tty".to_vec(), None);
|
||||
let result = TtySession::connect_direct(client_conn, test_negotiate("mock")).await;
|
||||
assert!(
|
||||
result.is_err(),
|
||||
"construction should fail when the negotiation write hits a broken pipe"
|
||||
);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user