Aleksey Shakhmatov
d90cde394c
Advertising topologyVersion in the hello reply is what tells a driver the server speaks the streaming (awaitable) hello protocol — in the Node driver it is the only condition checked. From the second heartbeat on, the driver then monitored with an exhaust hello (exhaustAllowed + maxAwaitTimeMS) and waited for a stream of replies carrying moreToCome. We answered once with the flag clear and went back to reading, so every heartbeat failed with "Server ended moreToCome unexpectedly", destroying the connection and clearing the pool. MongoDB Compass showed this as a connect/disconnect loop once per heartbeat. We do not implement streaming hello, so we must not claim to. Omitting the field keeps monitoring on the polling path, and agrees with the maxWireVersion 8 we report: streaming hello arrived in wire version 9. The existing e2e files all passed against the broken server — they issue their commands and exit before the second heartbeat — so e2e5 watches SDAM heartbeats on an idle connection instead. Also renames mongo-light to mongo-lite throughout (binary, log messages, docs, gitVersion). Unrelated to the fix above, but squashed in at request rather than left as a commit whose message described only the fix.
End-to-end tests with the official MongoDB Node.js driver
These exercise mongo-lite from a real driver over TCP: full CRUD, query operators, aggregation, error codes, concurrent clients, and crash recovery.
Setup
cd tests/e2e
npm init -y >/dev/null
npm install mongodb
Run
Start the server, then run the suites against it (defaults to port 27020):
zig build
zig-out/bin/mongo-lite --port 27020 --db /tmp/ml-e2e.log --ttl-sweep-secs 1 &
node tests/e2e/e2e.js # CRUD + operators + aggregate + errors (29 checks)
node tests/e2e/e2e2.js concurrent # 8 clients: 4 writers + 4 readers (2 checks)
node tests/e2e/e2e2.js crash-a # write 50 docs, then kill -9 the server
node tests/e2e/e2e2.js crash-b # restart and verify all 50 survived
node tests/e2e/e2e3.js # secondary indexes: unique/sparse/compound (16 checks)
node tests/e2e/e2e4.js # TTL indexes: expiry + rejected specs (15 checks)
e2e4.js needs the server started with --ttl-sweep-secs 1 (the default is
60 seconds, which is longer than the suite waits); the other suites do not
care about the flag.
Rebuild with zig build after any change under src/ before restarting the
server: zig build test compiles the test binary only and leaves
zig-out/bin/mongo-lite stale, so the suites keep running against the old
rules and report failures that the source no longer explains.
e2e2.js concurrent is safe to repeat against a running server (it drops its
collection first); crash-a/crash-b are two halves of one scenario.