fix(getport): Randomize first port using crypto #844
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The current implementation of `getPort()` relies on using `Date.now()` to get the first port to try to launch mongo on, even when the `EXP_NET0LISTEN` flag is set. This causes a couple issues: - If the `Date` module is mocked, it can result in `getFreePort()` returning the same first port every time. - If multiple mongos are being started at once in parallel, it's possible for the same first port to be picked leading to port conflicts In order to better randomize the initial port selection so that port conflicts can be avoided, instead of using `Date.now()` for an initial seed, use `crypto.randomInt()` which should provide more randomness and hopefully avoid some of these race conditions. Fixes nodkz#827
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #844 +/- ##
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+ Coverage 91.22% 91.24% +0.01%
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Files 15 15
Lines 1984 1988 +4
Branches 499 501 +2
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+ Hits 1810 1814 +4
Misses 165 165
Partials 9 9 ☔ View full report in Codecov by Sentry. |
hasezoey
approved these changes
Jan 13, 2024
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The current implementation of
getPort()relies on usingDate.now()to get the first port to try to launch mongo on, even when theEXP_NET0LISTENflag is set. This causes a couple issues:Datemodule is mocked, it can result ingetFreePort()returning the same first port every time.In order to better randomize the initial port selection so that port conflicts can be avoided, instead of using
Date.now()for an initial seed, usecrypto.randomInt()which should provide more randomness and hopefully avoid some of these race conditions.Related Issues