e2e: cover the protocols in-process, keep the droplet for the network path - #323
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e2e: cover the protocols in-process, keep the droplet for the network path#323myleshorton wants to merge 2 commits into
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…path The droplet e2e never exercised muxing or UDP. It predates the mux, and it has no UDP coverage at all -- it drives curl, which only opens TCP -- so the two things this transport now does differently on the wire had never been run end to end. That gap is the reason for this change; the maintenance argument follows from it. TestTwiddleCarriesTCPAndUDPOverOneTunnel stands up both boxes in-process and drives TCP and UDP through the client's SOCKS5 inbound: two HTTP requests (the second proving the tunnel is reused, which under muxing means a second stream rather than a second opening) and two datagrams echoed back through UoT. It needs no droplet, no Docker and no credentials, because what it tests is two lantern-box instances talking to each other -- which is what the remote host was standing in for in every assertion except the network path itself. Corrupting the ticket fails both halves, so it is the tunnel under test and not a leak past it. The droplet job moves to nightly plus manual dispatch. What it uniquely covers is a REAL remote host -- routing, MTU, a cover site over the actual internet -- and that is worth keeping for a transport whose job is surviving a network path. What it is not worth is gating every PR: it costs a droplet per run, needs DO_API_TOKEN, takes minutes, and fails on things unrelated to the change under review. A 422 from DigitalOcean's API reddened two boards on 2026-09-05, neither a code fault, and I misread the first as a rotated credential. No workflow change was needed for the PR side: test/e2e already runs in `make test`, so the new coverage lands on every PR as it is. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017gn6KuHUL766qQNn8m1fu1
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Limit details: You’ve used the included review currently available. 📝 WalkthroughWalkthroughThe E2E suite adds twiddle client and server fixtures. The test verifies two TCP streams and UDP traffic through one outer twiddle tunnel. The workflow now runs nightly or by manual dispatch instead of on pull requests. ChangesTwiddle E2E coverage
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change strengthens TCP, UDP, and tunnel-multiplexing coverage without changing runtime behavior. No current merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant TwiddleTest
participant SOCKS5Client
participant CountingRelay
participant TwiddleServer
TwiddleTest->>TwiddleServer: Start server with ticket configuration
TwiddleTest->>CountingRelay: Start relay and count outer connections
SOCKS5Client->>TwiddleTest: Send two TCP requests and UDP traffic
CountingRelay->>TwiddleServer: Proxy twiddle traffic
TwiddleTest-->>CountingRelay: Assert one outer connection
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✅ Passed checks (4 passed)
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Inline comments:
In `@test/e2e/twiddle_test.go`:
- Line 101: Update the test around hc.Get to force two separate or overlapping
HTTP connections despite idle-connection reuse, then count the inner dials and
assert that exactly two streams use the same outer Twiddle connection. Verify
both responses while preserving the existing request behavior.
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.github/workflows/e2e.yamltest/e2e/testdata/twiddle_client.jsontest/e2e/testdata/twiddle_server.jsontest/e2e/twiddle_test.go
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🟡 Changes recommended
The new e2e test claims to validate mux reuse but does not assert that only one outer Twiddle connection is used, leaving the key intended regression coverage effectively unverified.
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Pull request overview
Adds an in-process end-to-end test for the Twiddle protocol to exercise TCP and UDP traffic over a single client/server tunnel on loopback, and updates the “droplet” GitHub Actions workflow to run nightly/manual instead of gating every PR.
Changes:
- Add
TestTwiddleCarriesTCPAndUDPOverOneTunnel, standing up client/server sing-box instances in-process and driving TCP + UDP via the client’s SOCKS5 inbound. - Add minimal Twiddle client/server JSON configs for the in-process e2e test with placeholder substitution at runtime.
- Change
.github/workflows/e2e.yamlto run on a nightly cron + manual dispatch (removing PR gating).
File summaries
| File | Description |
|---|---|
| test/e2e/twiddle_test.go | New in-process e2e test driving TCP and UDP through Twiddle via a local SOCKS5 inbound. |
| test/e2e/testdata/twiddle_server.json | Server config template for the Twiddle inbound used by the new e2e test. |
| test/e2e/testdata/twiddle_client.json | Client config template for Twiddle outbound + mixed inbound used by the new e2e test. |
| .github/workflows/e2e.yaml | Moves droplet-based protocol e2e workflow from per-PR to nightly/manual triggers. |
Review details
- Files reviewed: 4/4 changed files
- Comments generated: 1
- Review effort level: Lite
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The comment said the second request proved the tunnel was reused under muxing. Nothing checked either half of that, and both halves were wrong. http.Transport caches idle connections, so with keep-alives on the second Get took the first request's connection back and no second stream was opened at all -- the loop was not exercising what the comment described. DisableKeepAlives forces a real second inner dial, and innerDials counts them so the loop cannot quietly stop testing anything again. And nothing counted OUTER connections, which is the property the test is named for. A regression opening a fresh twiddle tunnel per destination serves every request correctly, so it would have passed while the thing muxing exists for had been lost. countingRelay sits between the client box and the egress and counts; the test now requires three inner connections -- two TCP and the UoT carrier -- to have crossed one outer tunnel. Removing the session reuse from ensureSession now fails it. Before, it passed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017gn6KuHUL766qQNn8m1fu1
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🟢 Approval recommended
The changes are confined to test coverage and workflow scheduling, and the new test asserts the intended mux+UDP behavior without introducing production logic changes.
Review details
- Files reviewed: 4/4 changed files
- Comments generated: 0 new
- Review effort level: Lite
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The droplet e2e never exercised muxing or UDP. It predates the mux, and it has no UDP coverage at all — it drives
curl, which only opens TCP — so the two things twiddle now does differently on the wire had never been run end to end. That gap is the reason for this change; the maintenance argument follows from it.What the droplet was actually standing in for
Its assertions are: HTTP through the tunnel, HTTPS, a second connection (ticket rotation), and an unauthenticated prober reaching the cover site. Only the last genuinely needs the internet. The rest need two lantern-box processes on a network — which is loopback.
test/e2emake testDO_API_TOKEN, a paid VM, SSHThe new test
TestTwiddleCarriesTCPAndUDPOverOneTunnelstands up both boxes in-process and drives traffic through the client's SOCKS5 inbound:It is not vacuous: corrupting the ticket so the egress cannot authenticate the opening fails both subtests, so this is the tunnel under test rather than traffic leaking past it.
The droplet job
Moves to nightly (
0 7 * * *) plus manual dispatch. It stays because a real remote host — routing, MTU, a cover site over the actual internet — is worth having for a transport whose job is surviving a network path, and nothing in-process substitutes for it. It stops gating PRs because it costs a droplet per run, needs a secret, takes minutes, and fails on things unrelated to the change under review: a 422 from DigitalOcean's API reddened two boards on 2026-09-05, neither a code fault.Trigger it by hand whenever a change touches the wire.
Verification
mainatbcadc6b: twiddle http, https, ticket rotation and probe resistance all PASSED, alongside every other protocol. First real signal on that code.go build ./...,go vet ./...,go test ./...clean.test/e2ealready runs inmake test, so this coverage lands on every PR as it is.Not covered here
The other protocols still have only droplet coverage. Twiddle is done first because it is the one with untested new behaviour; the same pattern extends to ALGeneva, Samizdat, WATER, Reflex and Unbounded if this shape looks right.
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