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Zhengchao An
3b1bed7009
test(e2e): add socket-level network fault-injection proxy (backlog#1325) Add `FaultProxy`, an in-process async TCP proxy for black-box cluster E2E tests, under `crates/e2e_test/src/fault_proxy.rs`. It binds a random local port, forwards every accepted connection to a fixed target, and lets a test flip the wire behaviour at runtime. Fault modes: `Pass` (transparent), `Latency(Duration)` (delay each forwarded chunk), `Blackhole` (accept but forward nothing either way and never respond), and `Partition(Direction)` (block exactly one direction while the other keeps flowing). Modes are switchable at runtime via `set_mode`, and `shutdown` stops the accept loop and drops the listener so the bound port is released. This is the black-box counterpart to the in-process white-box hooks (rename barrier, disk call counters), which cannot reach across the process boundary into a spawned RustFS server. It serves the lock-plane one-way partition and accept-then-blackhole-peer acceptance for #1312/#1319 and the cross-process replay/tamper seam for #1327. Wiring it into the cluster harness (expose a node port through a proxy) plus the 5GiB / nightly CI-lane budget are follow-ups, since the harness multi-drive / 2-pool work lands separately (rustfs#4937); this block stays independent and self-tested. Self-tests run against a loopback echo server that records received bytes, covering: pass round-trip identity, latency lower-bound delay, blackhole no-response-no-panic, one-way partition in both directions (request-path vs return-path), runtime mode switching on a live connection, and port release after shutdown. Timing assertions use loose lower bounds and bounded read timeouts only, never fixed-sleep absolute-value checks, to stay non-flaky. No product code changes; the module is `#[cfg(test)]`-gated.