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fix(NODE-7881): hello command is compressed - #5072
PavelSafronov wants to merge 2 commits into
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Copilot review overview
🟢 Approval recommended
The implementation matches the compression specification and includes focused unit and integration coverage.
Review effort: Balanced
Findings: None
What changed in this PR
Prevents all modern and legacy hello commands from using wire compression.
Changes:
- Adds
hellovariants to the non-compressible command set. - Expands unit and SFP coverage for monitoring commands.
- Adds an integration-test hook detecting prohibited compression.
| File | Description |
|---|---|
src/cmap/wire_protocol/compression.ts |
Excludes modern and legacy hello commands from compression. |
test/unit/commands.test.ts |
Tests prohibited commands across both wire protocols. |
test/unit/sdam/monitor.test.ts |
Verifies polling, streaming, and RTT hellos remain uncompressed. |
test/tools/runner/hooks/compression_checker.ts |
Detects forbidden compressed commands during integration tests. |
test/mocha_mongodb.js |
Registers the compression checker. |
test/manual/sfp.test.ts |
Validates compressed SFP configurations maintain healthy monitoring. |
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| /** | ||
| * Monitoring connections are never authenticated, and the SFP rejects compressed messages on | ||
| * unauthenticated connections. If the driver compresses a monitoring `hello`, the SFP closes the |
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Let's not mention SFP behavior here, as it's likely to change independent of the driver.
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| // The handshake is never compressed because the compressor is only agreed upon in its | ||
| // reply, so these tests only inspect the hello commands sent after the handshake. | ||
| const isPostHandshakeHello = doc => isHello(doc) && !('compression' in doc); |
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Is it going to be true for all "non-compression" variants? I also not really follow, why do we want to focus on PostHandshakeHello commands here, can you elaborate please?
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Is it going to be true for all "non-compression" variants?
Yes, this will be true for all non-compression variants, since we explicitly pass compressors: ['zlib'] to the Monitor.
I also not really follow, why do we want to focus on PostHandshakeHello commands here, can you elaborate please?
We're only focusing on the post-handshake hellos because that's what's currently broken: we don't compress the handshake hello, but do compress the others.
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we don't compress the handshake hello
Is it because handshake goes through different code branch? The current solution looks good but a bit difficult to follow (I assume because we deal with low-level OP_COMPRESSED), I'm wondering if we might have simpler way to test monitoring.
For example, couple of lines below the comment says "leave the awaitable hello pending" and then call resolveAwaitableHello(doc);, it's unclear how these 2 are not contradicting each other. I saw that unit tests before were using public interface of the OpCompressedRequest, could this, for example, be enough for our use-case?
tadjik1
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Description
Summary of Changes
Never compress
hellocommands.Release Highlight
Double check the following
npm run check:lint)type(NODE-xxxx)[!]: descriptionfeat(NODE-1234)!: rewriting everything in coffeescript