Implements CallConnection in src/protocol/connection.rs representing an
established alknet/call connection (either direction). Holds the Layer 2
imported-ops overlay (ADR-024) as Arc<RwLock<HashMap>>.
- register_imported / register_imported_all add to the connection overlay
- overlay_env returns an OperationEnv dispatching to imported ops; contains()
returns true only for ops in the overlay
- call() opens a stream, sends call.requested, registers in PendingRequestMap,
spawns a stream reader, resolves on first call.responded
- subscribe() sends call.requested and yields call.responded until
call.completed/call.aborted via a SubscriptionStream wrapping the mpsc receiver
- abort() sends call.aborted for the request ID and removes the pending entry
- connection drop drops the overlay (no explicit deregistration needed)
Exposes MockConnection trait and Connection::from_mock in alknet-core so
cross-crate tests can construct mock connections without real QUIC. Removes
two unused test helpers in env.rs that triggered dead-code warnings under
-D warnings. Adds parking_lot dep for the overlay RwLock and pending Mutex.
9 new connection tests (102 total in alknet-call). Clippy clean.
Expand the minimal OperationEnv trait from the operation-context task with
concrete dispatch implementations per ADR-024:
- LocalOperationEnv (Layer 0): wraps Arc<OperationRegistry>. invoke_with_policy
runs the scoped_env reachability check (ADR-015/022), looks up the
registration, then constructs a child OperationContext with internal: true,
identity = parent.handler_identity.as_identity() (the ADR-015 authority
switch), fresh metadata (HashMap::new() — ADR-014 security constraint, no
parent metadata propagation), inherited deadline (parent.deadline, not a
fresh 30s), inherited env (parent.env.clone() — Arc::clone per ADR-024), and
the child's own composition_authority + scoped_env from its registration.
contains() uses the default impl (returns true — curated registry contains
everything it can dispatch).
- CompositeOperationEnv (per-call, ADR-024): composes session (Layer 1),
connection (Layer 2), and base (Layer 0) trait objects. invoke_with_policy
runs the same reachability check, then probes overlays in order via
contains() (the overlay-dispatch contract from review #003 C9), dispatching
to the first overlay that contains the op. contains() aggregates all layers.
The trait-object design is load-bearing: making OperationEnv concrete would
close the session-overlay and connection-overlay patterns. Same integration-
point pattern as IdentityProvider (ADR-004).
Tests cover: allowed/disallowed reachability, internal-flag propagation,
authority switch (child identity = parent handler_identity), fresh metadata,
inherited deadline, composite session-overlay dispatch, composite fall-through
to base, composite connection-overlay dispatch when session lacks op, and
composite contains aggregation.
Implements the operation context types in registry/context.rs (ADR-015,
ADR-022, ADR-024): OperationContext with all 10 fields (internal is
pub(crate) for writes, read via is_internal()), AbortPolicy enum with
AbortDependents default, CompositionAuthority with synthetic Identity
projection for ACL, ScopedOperationEnv reachability set, and
generate_request_id() (UUID v4). Adds a minimal OperationEnv trait
forward-declaration in registry/env.rs so the context env field compiles;
the operation-env task will expand it.
Create crates/alknet-call with Cargo.toml, lib.rs, and module skeletons
for the registry (spec, context, registration, env, discovery) and
protocol (wire, pending, connection, adapter, abort) subsystems. Add the
crate to the workspace members list. Depends on alknet-core (workspace
path), irpc (workspace dep), tokio, serde, serde_json, async-trait,
tracing, thiserror, uuid, and futures. Implements ProtocolHandler on
ALPN alknet/call per docs/architecture/crates/call.
