⚡ Bolt: Optimize SanitizeName by pre-compiling regex variants#10
⚡ Bolt: Optimize SanitizeName by pre-compiling regex variants#10T-ahamed2 wants to merge 1 commit into
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Pre-compiled the 4 possible regex patterns used in `applySanitizePattern` to avoid expensive recompilation on every call to `SanitizeName`. Performance impact: Reduces `SanitizeName` execution time by ~60% (from ~6.5µs to ~2.6µs per op). Tests: - Added `BenchmarkSanitizeName` to `pkg/stringutil/sanitize_test.go` - Verified with `go test -bench BenchmarkSanitizeName ./pkg/stringutil/...` - Ensured all tests in `pkg/stringutil` pass.
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Code Review
This pull request optimizes string sanitization in pkg/stringutil/sanitize.go by pre-compiling regex variants to avoid expensive recompilation, and adds corresponding benchmarks in pkg/stringutil/sanitize_test.go. The review feedback recommends placing the literal hyphen at the end of the regex character classes to prevent parsing ambiguity, adding a defensive nil check for options in buildSanitizePreservePattern, and updating the pattern matching in applySanitizePattern with a fallback compilation mechanism to ensure future-proofing and correctness.
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| var ( | ||
| multipleHyphens = regexp.MustCompile(`-+`) | ||
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| // Pre-compiled regex variants for SanitizeName to avoid expensive recompilation. | ||
| // These cover all possible combinations of preserved special characters (currently '.' and '_'). | ||
| reSanitizeDefault = regexp.MustCompile(`[^a-z0-9-]+`) | ||
| reSanitizeWithDot = regexp.MustCompile(`[^a-z0-9-.]+`) | ||
| reSanitizeWithUnderscore = regexp.MustCompile(`[^a-z0-9-_]+`) | ||
| reSanitizeWithBoth = regexp.MustCompile(`[^a-z0-9-._]+`) | ||
| ) |
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In regular expression character classes, placing a hyphen - in the middle of other characters (e.g., [^a-z0-9-.]+ or [^a-z0-9-_]+) can be ambiguous or error-prone, as it might be interpreted as a range separator depending on the context or regex engine.
It is a best practice to place the literal hyphen at the very end of the character class (e.g., [^a-z0-9.-]+ or [^a-z0-9_-]+) to ensure it is unambiguously parsed as a literal hyphen.
| var ( | |
| multipleHyphens = regexp.MustCompile(`-+`) | |
| // Pre-compiled regex variants for SanitizeName to avoid expensive recompilation. | |
| // These cover all possible combinations of preserved special characters (currently '.' and '_'). | |
| reSanitizeDefault = regexp.MustCompile(`[^a-z0-9-]+`) | |
| reSanitizeWithDot = regexp.MustCompile(`[^a-z0-9-.]+`) | |
| reSanitizeWithUnderscore = regexp.MustCompile(`[^a-z0-9-_]+`) | |
| reSanitizeWithBoth = regexp.MustCompile(`[^a-z0-9-._]+`) | |
| ) | |
| var ( | |
| multipleHyphens = regexp.MustCompile(`-+`) | |
| // Pre-compiled regex variants for SanitizeName to avoid expensive recompilation. | |
| // These cover all possible combinations of preserved special characters (currently '.' and '_'). | |
| // The hyphen is placed at the end of the character class to prevent it from being interpreted as a range. | |
| reSanitizeDefault = regexp.MustCompile(`[^a-z0-9-]+`) | |
| reSanitizeWithDot = regexp.MustCompile(`[^a-z0-9.-]+`) | |
| reSanitizeWithUnderscore = regexp.MustCompile(`[^a-z0-9_-]+`) | |
| reSanitizeWithBoth = regexp.MustCompile(`[^a-z0-9._-]+`) | |
| ) |
| func buildSanitizePreservePattern(opts *SanitizeOptions) string { | ||
| var preserveChars strings.Builder | ||
| preserveChars.WriteString("a-z0-9-") // Always preserve alphanumeric and hyphens | ||
| for _, char := range opts.PreserveSpecialChars { | ||
| switch char { | ||
| case '.', '_': | ||
| preserveChars.WriteRune(char) | ||
| } | ||
| hasDot := slices.Contains(opts.PreserveSpecialChars, '.') | ||
| hasUnderscore := slices.Contains(opts.PreserveSpecialChars, '_') | ||
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| if hasDot && hasUnderscore { | ||
| return "a-z0-9-._" | ||
| } | ||
| return preserveChars.String() | ||
| if hasDot { | ||
| return "a-z0-9-." | ||
| } | ||
| if hasUnderscore { | ||
| return "a-z0-9-_" | ||
| } | ||
| return "a-z0-9-" | ||
| } |
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To align with placing the hyphen at the end of the character class in the pre-compiled regexes, we should update the returned strings here as well.
Additionally, let's add a defensive nil check for opts to prevent potential nil-pointer dereferences if this helper is ever called with a nil options struct in the future.
| func buildSanitizePreservePattern(opts *SanitizeOptions) string { | |
| var preserveChars strings.Builder | |
| preserveChars.WriteString("a-z0-9-") // Always preserve alphanumeric and hyphens | |
| for _, char := range opts.PreserveSpecialChars { | |
| switch char { | |
| case '.', '_': | |
| preserveChars.WriteRune(char) | |
| } | |
| hasDot := slices.Contains(opts.PreserveSpecialChars, '.') | |
| hasUnderscore := slices.Contains(opts.PreserveSpecialChars, '_') | |
| if hasDot && hasUnderscore { | |
| return "a-z0-9-._" | |
| } | |
| return preserveChars.String() | |
| if hasDot { | |
| return "a-z0-9-." | |
| } | |
| if hasUnderscore { | |
| return "a-z0-9-_" | |
| } | |
| return "a-z0-9-" | |
| } | |
| func buildSanitizePreservePattern(opts *SanitizeOptions) string { | |
| if opts == nil { | |
| return "a-z0-9-" | |
| } | |
| hasDot := slices.Contains(opts.PreserveSpecialChars, '.') | |
| hasUnderscore := slices.Contains(opts.PreserveSpecialChars, '_') | |
| if hasDot && hasUnderscore { | |
| return "a-z0-9._-" | |
| } | |
| if hasDot { | |
| return "a-z0-9.-" | |
| } | |
| if hasUnderscore { | |
| return "a-z0-9_-" | |
| } | |
| return "a-z0-9-" | |
| } |
| func applySanitizePattern(result, allowedChars string, preserveSpecialChars bool) string { | ||
| pattern := regexp.MustCompile(`[^` + allowedChars + `]+`) | ||
| var pattern *regexp.Regexp | ||
| switch allowedChars { | ||
| case "a-z0-9-.": | ||
| pattern = reSanitizeWithDot | ||
| case "a-z0-9-_": | ||
| pattern = reSanitizeWithUnderscore | ||
| case "a-z0-9-._": | ||
| pattern = reSanitizeWithBoth | ||
| default: | ||
| pattern = reSanitizeDefault | ||
| } |
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Let's update the switch cases to match the updated character class strings.
Additionally, the current default case silently falls back to reSanitizeDefault if an unexpected allowedChars string is passed. If a developer adds support for other special characters in the future but forgets to update this switch statement, it would lead to silent correctness bugs (unwanted characters would be stripped instead of preserved).
Adding an explicit case for "a-z0-9-" and falling back to compiling the regex on the fly in the default case ensures correctness and future-proofs the code.
func applySanitizePattern(result, allowedChars string, preserveSpecialChars bool) string {
var pattern *regexp.Regexp
switch allowedChars {
case "a-z0-9-":
pattern = reSanitizeDefault
case "a-z0-9.-":
pattern = reSanitizeWithDot
case "a-z0-9_-":
pattern = reSanitizeWithUnderscore
case "a-z0-9._-":
pattern = reSanitizeWithBoth
default:
// Fallback to compiling on the fly if an unexpected pattern is passed (e.g. future extensions)
pattern = regexp.MustCompile(`[^` + allowedChars + `]+`)
}1 participant
This optimization targets the
SanitizeNamefunction inpkg/stringutil/sanitize.go. Previously,applySanitizePatternwould compile a new regular expression on every invocation, which is expensive for a frequently used utility.By identifying that only a small number of regex patterns are actually possible (based on whether '.' or '_' are preserved), I pre-compiled these 4 variants at the package level.
📊 Performance Gain:
The change was verified for correctness using existing unit tests and for performance using newly added benchmarks. Pre-existing unrelated test failures in other packages were noted.
PR created automatically by Jules for task 3564610116317565925 started by @T-ahamed2