⚡ Bolt: Optimize random string generation#2175
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- Replaced O(N^2) string concatenation with O(N) `String.fromCharCodes` in `randomIDString`. - Reused `Random` instance to reduce allocation overhead. - Added unit tests for `randomIDString` and `randomString`. Co-authored-by: nilsreichardt <24459435+nilsreichardt@users.noreply.github.com>
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Code Review
This pull request optimizes random string generation by reusing a Random instance and using a more efficient method for string construction in randomIDString. However, the use of the non-cryptographically secure Random() class for generating identifiers in randomIDString introduces a potential security risk, as the generated strings may be predictable. It is recommended to use Random.secure() to ensure the identifiers are cryptographically strong. Additionally, consider applying a similar optimization to the randomString function for consistency and further efficiency.
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| import 'dart:math'; | ||
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| final _random = Random(); |
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The use of dart:math's Random() class for generating identifiers is not cryptographically secure. Random() is a pseudo-random number generator (PRNG) whose output is predictable if the internal state is known or can be guessed. For generating IDs or any strings that require high entropy and unpredictability (such as session tokens, CSRF tokens, or unguessable resource identifiers), Random.secure() should be used instead. Reusing a single global instance (_random) across all calls further increases the predictability of the generated strings.
| final _random = Random(); | |
| final _random = Random.secure(); |
| var codeUnits = List.generate(length, (index) { | ||
| return rand.nextInt(33) + 89; | ||
| return _random.nextInt(33) + 89; | ||
| }); | ||
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| return String.fromCharCodes(codeUnits); |
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For consistency with the excellent optimization you've applied to randomIDString, and to make this function slightly more efficient, you can apply a similar pattern here. This avoids creating an intermediate List and also addresses a couple of style guide points.
| var codeUnits = List.generate(length, (index) { | |
| return rand.nextInt(33) + 89; | |
| return _random.nextInt(33) + 89; | |
| }); | |
| return String.fromCharCodes(codeUnits); | |
| return String.fromCharCodes( | |
| Iterable.generate(length, (_) => _random.nextInt(33) + 89), | |
| ); |
References
- The
indexparameter is unused. The style guide at line 20 (PREFER using wildcards for unused callback parameters) suggests using_for unused parameters. (link) - An intermediate list
codeUnitsis created. The style guide at line 102 (AVOID storing what you can calculate) suggests avoiding storing values that can be computed on the fly. (link)
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💡 What: Optimized
randomIDStringto useString.fromCharCodesand reusedRandominstance.🎯 Why:
randomIDStringused string concatenation in a loop (O(N^2)) and created a newRandominstance on every call.📊 Impact: Improves string generation performance (O(N)) and reduces object allocation overhead.
🔬 Measurement: Verified with new unit tests in
lib/sharezone_utils/test/random_string_test.dartand existing test suite.PR created automatically by Jules for task 4132018164189155002 started by @nilsreichardt