net: socket.write() returns Node's boolean + 'drain'; bound in-flight writes so bursts can't exhaust the loop by proggeramlug · Pull Request #11130 · PerryTS/perry

proggeramlug · 2026-09-23T14:41:16Z

One PR fixes both. The root causes differ, but both fixes live in the same per-socket write-queue accounting. write()'s boolean is judged against writableLength, and the #11106 fix changes what that count contains: bytes waiting in the new backlog are now part of it. Splitting the two would ship an interim writableLength that the second PR changes again.

#11106: 40,000 × 64 B writes then `end()` delivered 0 bytes

I confirmed the counts on the #11105 base: client error write ENOMEM, server received 0. Node delivers 2,560,000.

Root cause. Every socket.write() became its own turnloop driver operation. The operation table is shared by the whole loop and bounded (max_operations: 32_768 in agent_loop::net_config). The burst filled it, and submission #32,769 failed with ENOMEM. The error path destroyed the socket, and close cancelled every write already queued. So end() never "overtook" the data; the data was cancelled before the FIN existed.

Fix (perry-runtime/src/turnloop_net/{mod,write_queue}.rs). A socket now has at most one driver write in flight, the same shape as libuv's one active write request per stream. Later writes collect in a per-socket Backlog, and each write completion submits the whole backlog as one buffer. end() is queued behind the backlog. The caller still gets one Wrote completion per write(), in order, with its own length and callback token, so write(chunk, cb) and bytesWritten behave as before.

The backlog is keyed outside the Entry, which also fixes a sibling bug found while testing. Writes issued before connect completes (including while localhost is still resolving) now wait for the connection that actually succeeds. On the #11105 base, net.connect(port, "localhost").write(...) answered write ENOENT and then hung; an IP literal worked.

#11111: `socket.write()` returned `undefined`

Fix (perry-ext-net). write() now returns Node's boolean, judged the way Writable.prototype.write judges it: the chunk is counted into writableLength first, then ret = writableLength < writableHighWaterMark (64 KiB). A false sets writableNeedDrain. When the queue empties, 'drain' is emitted once, before the completed write's callback and never while ending or destroyed. That ordering matches Node's afterWrite. A write to a destroyed or ended socket returns false.

What changed, by site:

js_ext_net_socket_write3 and js_ext_net_socket_write now return the boolean.
The codegen NativeModSig for Socket.write changed from NR_VOID to NR_F64 (typed path).
The ext-net handle dispatch "write" arm (untyped path, the one mongodb hits) returns the value instead of undefined().
The perry-stdlib fastify_net_zlib dispatch arm returns the value as well.
New getters: writableLength, writableHighWaterMark, writableNeedDrain. bufferSize now reports the real queue length instead of a constant 0.
New PendingNetEvent::Drain, pushed from the write-completion sink.

js_net_socket_write (the shared name with a bundled-stdlib twin) deliberately keeps its () signature, because a duplicate symbol must have one signature. Callers that need the boolean use the distinct js_ext_net_* symbols. perry-stdlib/src/tls/dispatch.rs's TLS-client "write" arm calls that shared name, so it still returns undefined (not touched here, see "Not done").

Tests

New gap tests. Each is byte-identical to Node 26.5.1 (/opt/node-v26.5.1-linux-x64, matches .node-version) and stable across 5–6 Node runs:

test_gap_net_socket_write_return_drain: the boolean on typed and untyped (any) receivers, writableLength / writableNeedDrain, 'drain' before the write callback, exactly one 'drain', and the mongodb if (!write()) await once(sock, "drain") shape. The false cases write before the connection completes, where Node holds every byte in the stream. A connected large write depends on host socket buffers, so it is not printed.
test_gap_net_write_burst_then_end: the net: burst of 40k writes then end() delivers 0 bytes to a local server (Node: all 2.56 MB) #11106 shape. It checks bytes received, 40,000 callbacks in order with 0 errors, and bytesWritten.
test_gap_net_write_before_connect_hostname: early writes to 127.0.0.1 and to localhost. end() is called from 'connect', because Node 26 itself drops the FIN of an end() issued while a hostname connect is still selecting a family.

After rebasing onto main at 784ed8e (train 266, which contains #11105): the branch is now these three commits only. I rebuilt it (perry-dev, -p perry -p perry-runtime-static -p perry-stdlib-static), and all three new gap tests PASS on the harness. The ratchets that had failed only because of the old base are clean against 784ed8e: unrooted-local 384→384, --check OK, raw-handle 901→901, no lock downgrade. cargo fmt --check and check_file_size.sh are clean. The A/B and unit-test runs below are from before the rebase, on the #11105 head 4f806f15c.

Fails without / passes with. Run on the real harness (PERRY_SKIP_BUILD=1 PERRY_BIN=… PERRY_RUNTIME_DIR=… ./run_parity_tests.sh --filter X). Both arms were perry-dev builds of -p perry -p perry-runtime-static -p perry-stdlib-static, the base arm from a worktree at 4f806f15c:

test	#11105 base	this branch
test_gap_net_socket_write_return_drain	PARITY_FAIL	PASS
test_gap_net_write_burst_then_end	PARITY_FAIL (`received 0`)	PASS
test_gap_net_write_before_connect_hostname	CRASH (timeout after `write ENOENT`)	PASS

A/B, 42 net/socket/stream/http/ws/turnloop/tls gap and parity tests, same harness, both arms. No regressions: every test outside the three above has the same result on both arms. Five tests fail identically on both: test_gap_turnloop_p3_timer_heap and test_gap_turnloop_ws_{attached,client,frames,server}. In the ws tests the Node side exits 1 in package_json_reader (the fixture's package is not installed in these fresh clones). test_parity_http2 and test_parity_https PASS on both arms; on the base arm the harness exited 124 after reporting PASS.

Unit tests.

perry-ext-net: 34 passed. New: write_returns_node_boolean_against_the_high_water_mark, refused_or_ended_writes_return_false, drain_fires_once_when_the_queue_empties_and_not_after_end.
perry-runtime turnloop_net (RUST_TEST_THREADS=1): 21 passed. New: a_write_burst_larger_than_the_operation_table_is_delivered_whole, which drives 40,000 writes through the real driver and asserts that at most one operation is in flight, every byte precedes the FIN, one completion per write in order, and no NET_ERROR. Also new: writes_and_end_before_connect_are_delivered_after_it.

Lint. cargo fmt --all -- --check is clean. scripts/check_file_size.sh is OK. With SKIP_COMPILE_GATES=1, run_lint_gates.sh passed 84 of 88 script gates; the compile tier was not run. Of the 4 failures:

cargo xwin is not installed on the Linux host.
Three vs-merge-base ratchets diffed against an origin/main that did not yet contain turnloop: move perry-ext-net off tokio and tokio-rustls (tokio group A, net half) #11105. After the rebase they are clean against 784ed8e (see above).
The absolute unrooted_local_shape.py --check passes.

cargo check -p perry-runtime -p perry-ext-net -p perry-stdlib -p perry-codegen --all-targets is clean apart from pre-existing warnings.

mongodb 7.5.0

Before the rebase: I ran this branch on the #11105 head with #11113 (the #11043 fix) cherry-picked, against a private mongod 8.0.4. The driver got past hello: the probe printed hb ok → sd changed … Standalone → Connected successfully to server → ping 1. insertMany then failed with write after end from a Transform (#10449).

After the rebase onto main 784ed8e (with #11113 cherry-picked):

The PassThrough/Transform emits 'end' (and re-emits buffered data) once its buffer drains, although end() was never called #10449 Transform repro and a socket.pipe(Transform) request/response variant both match Node now; fix(stream): a live-push readable ends only at EOF (#11045) #11096 in train 264 appears to have fixed that shape. Details are on PassThrough/Transform emits 'end' (and re-emits buffered data) once its buffer drains, although end() was never called #10449.
The mongodb fixture now fails earlier, at new MongoClient(...), with 'get protocol' called on an object that is not a valid instance of URL. This is a separate regression on main and is unrelated to this PR: the repro imports no net code, and it fails the same way with or without fix(runtime): reflect ClassBody accessors on per-evaluation class prototypes #11113. Filed as mongodb-connection-string-url: 'get protocol' called on an object that is not a valid instance of URL (regression on main, blocks mongodb connect) #11139.

Not done / not run

The TLS-client "write" arm in perry-stdlib/src/tls/dispatch.rs (bundled-stdlib tls.connect path) still returns undefined. The ext-net path, which tls.connect uses when ext-net is the provider, gets the fix through the shared socket_method dispatch. No TLS write() return-value gap test was added.
No instruction-count A/B. The change adds one HashMap lookup per write and coalesces bursts into fewer syscalls; not measured.
No full gap sweep. The compile tier of run_lint_gates.sh was not run.
mongodb was not run on a no-fix arm. The pre-fix hello hang is the one documented in net.Socket#write returns undefined instead of a boolean, so drain-aware writers (mongodb) hang forever #11111. After the rebase, mongodb end-to-end is blocked by mongodb-connection-string-url: 'get protocol' called on an object that is not a valid instance of URL (regression on main, blocks mongodb connect) #11139, so the hello fix was verified only on the pre-rebase base.
The A/B and unit-test runs were not repeated after the rebase; only the three new gap tests and the ratchets were re-run.
The Windows cfg arms were not type-checked (cargo xwin unavailable).

coderabbitai · 2026-09-23T14:41:59Z

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Walkthrough

Network socket I/O now runs through turnloop. The runtime batches writes and preserves queued writes and shutdowns across connection setup. Socket writes return a boolean, expose writable queue state, and emit drain events after backpressure clears.

Changes

Turnloop network I/O

Layer / File(s)	Summary
Turnloop routing and connected-stream adoption `crates/perry-ext-net/src/lib.rs`, `crates/perry-ext-net/src/turnloop_io.rs`, `crates/perry-ext-net/src/adopt.rs`, `crates/perry-ext-net/src/ipc.rs`	Socket commands, connects, listeners, and TLS operations run on the loop owner or are posted to it. Connected streams are adopted through turnloop, and the Tokio socket-task path is removed.
Runtime write queue and connect buffering `crates/perry-runtime/src/turnloop_net/*`, `crates/perry-runtime/src/turnloop_net/tests.rs`, `test-files/test_gap_net_write_burst_then_end.ts`, `test-files/test_gap_net_write_before_connect_hostname.ts`	The runtime batches writes, defers shutdown behind queued writes, and retains backlogs during connection attempts. Tests cover large write bursts, early shutdown, and writes before connect.
Socket write results and drain events `crates/perry-codegen/src/lower_call/native_table/net_events.rs`, `crates/perry-ext-net/src/{dispatch.rs,lifecycle.rs,provider_lifecycle.rs,socket_events.rs,turnloop_io.rs,lib.rs}`, `crates/perry-stdlib/src/common/dispatch/fastify_net_zlib.rs`, `test-files/test_gap_net_socket_write_return_drain.ts`, `changelog.d/11130-net-write-return-drain.md`	Socket writes return a boolean, and writable properties report queue state. Drain events are dispatched after the queue empties. Tests cover typed and untyped write paths, return values, buffer state, and event order.

Estimated code review effort: 4 (Complex) | ~60 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant Dispatch as socket_method
  participant Lifecycle as lifecycle::enqueue_socket_write
  participant TurnloopNet as turnloop_net::write
  participant Driver
  participant TurnloopIO as turnloop_io::on_wrote
  participant SocketEvents as socket_events
  Caller->>Dispatch: call write(chunk)
  Dispatch->>Lifecycle: submit chunk
  Lifecycle->>TurnloopNet: enqueue write
  TurnloopNet->>Driver: submit eligible write batch
  Lifecycle-->>Caller: return boolean result
  Driver-->>TurnloopIO: report Wrote completion
  TurnloopIO->>SocketEvents: enqueue Drain before write callbacks
  SocketEvents-->>Caller: emit drain event

Merge Risk: 🟡 Moderate · up to a5af7

The change makes socket.write() return a boolean and fixes lost writes in a burst followed by end(), but several edge cases remain. Data written before connect() may be silently lost, and 'drain' may never fire afterwards. TLS sockets can report no backpressure while data is still buffered. A repeated end() during connect leaves the first callback without a normal completion. Resolve these before merging.

🚥 Pre-merge checks | ✅ 2 | ❌ 3

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR satisfies the TCP write requirements in [`#11111`] and [`#11106`]. The ext-net dispatch returns the boolean from `js_ext_net_socket_write3`. The lifecycle tracks `writableLength`, the 64 KiB high-w…	Update the bundled TLS-client `"write"` dispatch path to return the native boolean result. Add an automated TLS socket test that verifies the boolean result and the later `'drain'` event.
Out of Scope Changes check	⚠️ Warning	The write queue, write-result handling, drain handling, and related tests directly implement [`#11111`] and [`#11106`]. The PR also rewrites general Tokio transport, IPC, TLS transport setup, HTTP upgrade…	Remove the unrelated transport, IPC, HTTP upgrade, and `setNoDelay()` changes from this PR, or link coding requirements that require each change and add regression coverage for those changes.
Docstring Coverage	⚠️ Warning	Docstring coverage is 72.04% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 93 functions across 26 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies both primary changes: Node-compatible socket.write() results and drain behavior, plus bounded in-flight writes for bursts.
Description check	✅ Passed	The description provides a detailed summary, linked issues, implementation changes, test results, regression comparisons, and known limitations. It does not use every template heading or explicitly co…

Full details: Linked Issues check

Explanation

The PR satisfies the TCP write requirements in [#11111] and [#11106]. The ext-net dispatch returns the boolean from js_ext_net_socket_write3. The lifecycle tracks writableLength, the 64 KiB high-water mark, writableNeedDrain, and drain eligibility. The write queue preserves burst data and defers end() behind queued writes. Runtime tests cover 40,000 writes and writes before connect. The bundled TLS-client "write" dispatch arm still calls js_net_socket_write and returns undefined. No TLS write-return or TLS drain test covers [#11111]'s TLS requirement.

Full details: Out of Scope Changes check

Explanation

The write queue, write-result handling, drain handling, and related tests directly implement [#11111] and [#11106]. The PR also rewrites general Tokio transport, IPC, TLS transport setup, HTTP upgrade adoption, and socket lifecycle paths. It changes setNoDelay() to a no-op and removes TCP_NODELAY regression tests. The linked issues do not require these separate behavior changes, and the available summary does not connect them to write return, drain, write ordering, or end() sequencing.

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…ght writes per socket - perry-runtime turnloop_net: at most one driver write per socket; later writes (and pre-connect writes) coalesce in a per-socket backlog and flush as one buffer on completion/connect. A burst of 40k writes no longer exhausts the loop's operation table (ENOMEM -> 0 bytes delivered). - perry-ext-net: write() returns true/false against writableHighWaterMark (64 KiB), arms writableNeedDrain, emits 'drain' when the queue empties; writableLength/writableHighWaterMark/writableNeedDrain/bufferSize getters.

…te bursts

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@crates/perry-ext-http/src/client_upgrade.rs`:
- Around line 151-154: Check socket_id against perry_ffi::INVALID_HANDLE
immediately after adoption and return an upgrade error before emitting the
upgrade event or reporting success when adoption fails.

In `@crates/perry-ext-net/src/adopt.rs`:
- Around line 99-110: Carry the HTTP server’s AgentId through the adoption flow:
capture it before spawning the transport task and store it alongside each parked
stream in pending_adoptions. Update adoption posting to target that explicit
agent rather than relying on current_agent(), and filter
ensure_adopted_socket_dispatch so each owner loop flushes only streams belonging
to its agent.

In `@crates/perry-runtime/src/turnloop_net/write_queue.rs`:
- Around line 83-87: Update accept_write and accept_shutdown to check whether
the connection plan is retrying; while it is, defer writes and shutdowns to the
backlog even if the current entry is closing. Preserve existing rejection
behavior for listeners and closing entries when no retry is in progress.

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📒 Files selected for processing (34)

changelog.d/11105-ext-net-off-tokio.md
changelog.d/11130-net-write-return-drain.md
crates/perry-codegen/src/lower_call/native_table/net_events.rs
crates/perry-ext-http/src/client_upgrade.rs
crates/perry-ext-http/src/server/raw_upgrade.rs
crates/perry-ext-net/Cargo.toml
crates/perry-ext-net/src/adopt.rs
crates/perry-ext-net/src/buffer_pool.rs
crates/perry-ext-net/src/dispatch.rs
crates/perry-ext-net/src/ipc.rs
crates/perry-ext-net/src/lib.rs
crates/perry-ext-net/src/lifecycle.rs
crates/perry-ext-net/src/nodelay_tests.rs
crates/perry-ext-net/src/option_setters.rs
crates/perry-ext-net/src/provider_lifecycle.rs
crates/perry-ext-net/src/raw_bridge.rs
crates/perry-ext-net/src/server_state.rs
crates/perry-ext-net/src/socket_events.rs
crates/perry-ext-net/src/task_spawn.rs
crates/perry-ext-net/src/tests.rs
crates/perry-ext-net/src/tls.rs
crates/perry-ext-net/src/transport.rs
crates/perry-ext-net/src/turnloop_io.rs
crates/perry-ffi/src/turnloop_net.rs
crates/perry-runtime/src/turnloop_net/abi.rs
crates/perry-runtime/src/turnloop_net/mod.rs
crates/perry-runtime/src/turnloop_net/tests.rs
crates/perry-runtime/src/turnloop_net/write_queue.rs
crates/perry-stdlib/src/common/dispatch/fastify_net_zlib.rs
scripts/gc_runtime_root_holders.json
scripts/tokio_inventory.json
test-files/test_gap_net_socket_write_return_drain.ts
test-files/test_gap_net_write_before_connect_hostname.ts
test-files/test_gap_net_write_burst_then_end.ts

💤 Files with no reviewable changes (3)

crates/perry-ext-net/src/task_spawn.rs
crates/perry-ext-net/src/nodelay_tests.rs
crates/perry-ext-net/src/transport.rs

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Inline comments:
In `@crates/perry-ext-net/src/lifecycle.rs`:
- Line 477: Update SocketState::command so writes issued before connect retain
their data and completion token instead of being dropped when setting
need_drain; submit the retained writes through the runtime backlog when the
first connect starts, allowing write completion to clear need_drain and emit
drain.
- Around line 475-479: Track outstanding TLS plaintext separately from the
ciphertext queue: increment it when TLS accepts plaintext and decrement it by
completed plaintext lengths in the TLS completion path. Use the combined
outstanding-byte count for writableLength, the high-water-mark comparison, and
the drain decision in the lifecycle backpressure logic.

In `@crates/perry-runtime/src/turnloop_net/mod.rs`:
- Line 777: Update `write_queue::accept_shutdown` and its deferred `End`
completion handling so repeated `end()` calls do not overwrite an earlier token:
retain and complete every token, or settle a repeated call immediately while
preserving the first pending token.

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crates/perry-ext-net/src/adopt.rs
crates/perry-ext-net/src/ipc.rs
crates/perry-ext-net/src/lib.rs
crates/perry-ext-net/src/lifecycle.rs
crates/perry-ext-net/src/turnloop_io.rs
crates/perry-runtime/src/turnloop_net/mod.rs
crates/perry-runtime/src/turnloop_net/tests.rs

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proggeramlug · 2026-09-23T16:29:21Z

Ready for a train: rebased onto main after merge train 266, head a5af7ea. It carries only its own three commits and is no longer stacked on #11105. The 3 new gap tests pass on the harness, and the ratchets are clean against 784ed8e (unrooted-local 384, raw-handle 901). The 42-test A/B and the unit tests have not been re-run since the rebase. Separately, #10449 no longer reproduces on main (fixed by #11096), and mongodb's next blocker is #11139.

…w, repeated end() - TLS: write() and writableLength count outstanding application bytes (the TLS layer's pending plaintext), not the driver's ciphertext queue, which is empty mid-handshake. A 64 KiB write before 'secureConnect' returned true. - TLS: writes and end() on a tls.connect socket before its TCP connect are held in ext-net and replayed through the TLS layer once it is installed. They sat in the runtime's plaintext backlog and went out in the clear ahead of the ClientHello (server: DecodeError). - A write or end() while a connect plan is between attempts goes to the backlog instead of being refused by the closing failed attempt. - Repeated end(): only the first submits the shutdown; later callbacks complete with it, in order. The runtime refuses a second deferred shutdown instead of overwriting the first token. - write() on new net.Socket() before connect() returns false, as in Node.

proggeramlug pushed a commit that referenced this pull request Sep 23, 2026

changelog: net write() boolean/'drain' and write-burst fix (#11130)

01ef416

perry-bot added 3 commits September 23, 2026 14:42

test(net): gap tests + unit tests for write() boolean/'drain' and wri…

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…te bursts

changelog: net write() boolean/'drain' and write-burst fix (#11130)

a5af7ea

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Comment thread crates/perry-ext-http/src/client_upgrade.rs

Comment thread crates/perry-ext-net/src/adopt.rs

Comment thread crates/perry-runtime/src/turnloop_net/write_queue.rs

proggeramlug force-pushed the fix/net-write-drain-11111-11106 branch from 01ef416 to a5af7ea Compare September 23, 2026 15:03

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Comment thread crates/perry-ext-net/src/lifecycle.rs

Comment thread crates/perry-ext-net/src/lifecycle.rs

Comment thread crates/perry-runtime/src/turnloop_net/mod.rs

proggeramlug merged commit 20858f5 into main Sep 23, 2026
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proggeramlug deleted the fix/net-write-drain-11111-11106 branch September 23, 2026 20:01

proggeramlug pushed a commit that referenced this pull request Sep 24, 2026

changelog: net/tls follow-up to #11130 (#11182)

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proggeramlug mentioned this pull request Sep 24, 2026

fix(hir): a per-evaluation class declaration's own statics resolve to its evaluation, not the template (#11157) #11188

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proggeramlug pushed a commit that referenced this pull request Sep 24, 2026

changelog: net/tls follow-up to #11130 (#11182)

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net: socket.write() returns Node's boolean + 'drain'; bound in-flight writes so bursts can't exhaust the loop - #11130

net: socket.write() returns Node's boolean + 'drain'; bound in-flight writes so bursts can't exhaust the loop#11130
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#11106: 40,000 × 64 B writes then end() delivered 0 bytes

#11111: socket.write() returned undefined

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#11106: 40,000 × 64 B writes then `end()` delivered 0 bytes

#11111: `socket.write()` returned `undefined`

coderabbitai Bot commented Sep 23, 2026 •

edited

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