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| 1 | +// SPDX-License-Identifier: AGPL-3.0-or-later |
| 2 | + |
| 3 | +// Command bench runs HTTP latency scenarios against a target shithub |
| 4 | +// instance and emits one JSON record per scenario to stdout. The |
| 5 | +// output is structured for ingestion into a perf-baseline file. |
| 6 | +// |
| 7 | +// Usage: |
| 8 | +// |
| 9 | +// go run ./bench -target=http://localhost:8080 -iters=20 > out.json |
| 10 | +// |
| 11 | +// `make bench-small` invokes this against the dev instance with a |
| 12 | +// short scenario list; `make bench-full` is the placeholder hook for |
| 13 | +// the nightly run that exercises big-fixture scenarios (1M-commit |
| 14 | +// repo, 100k-issue repo) — those fixtures aren't generated by this |
| 15 | +// harness yet (the seed cost is non-trivial; see fixtures/README.md |
| 16 | +// for the planned generators). |
| 17 | +// |
| 18 | +// The "harness in the repo, not external" choice is per the S36 |
| 19 | +// design notes: keeps perf-as-a-feature visible in PR review. |
| 20 | +package main |
| 21 | + |
| 22 | +import ( |
| 23 | + "context" |
| 24 | + "encoding/json" |
| 25 | + "flag" |
| 26 | + "fmt" |
| 27 | + "io" |
| 28 | + "net/http" |
| 29 | + "os" |
| 30 | + "sort" |
| 31 | + "time" |
| 32 | +) |
| 33 | + |
| 34 | +// Scenario is one named HTTP probe. Status is checked against an |
| 35 | +// expected code; latency is measured wall-clock at the client. |
| 36 | +type Scenario struct { |
| 37 | + Name string |
| 38 | + Method string |
| 39 | + Path string |
| 40 | + ExpectedStatus int |
| 41 | +} |
| 42 | + |
| 43 | +// Result is the per-scenario emission. Latencies in microseconds so |
| 44 | +// the JSON stays integer-friendly for downstream tools. |
| 45 | +type Result struct { |
| 46 | + Scenario string `json:"scenario"` |
| 47 | + Iters int `json:"iters"` |
| 48 | + OkCount int `json:"ok_count"` |
| 49 | + P50us int64 `json:"p50_us"` |
| 50 | + P95us int64 `json:"p95_us"` |
| 51 | + P99us int64 `json:"p99_us"` |
| 52 | + MaxUs int64 `json:"max_us"` |
| 53 | + MeanUs float64 `json:"mean_us"` |
| 54 | +} |
| 55 | + |
| 56 | +func main() { |
| 57 | + target := flag.String("target", "http://localhost:8080", "base URL to probe") |
| 58 | + iters := flag.Int("iters", 20, "iterations per scenario") |
| 59 | + timeout := flag.Duration("timeout", 30*time.Second, "per-request timeout") |
| 60 | + flag.Parse() |
| 61 | + |
| 62 | + scenarios := []Scenario{ |
| 63 | + {"home", "GET", "/", 200}, |
| 64 | + {"explore", "GET", "/explore", 200}, |
| 65 | + // The repo paths assume the dev seed's `sarah/demo-pub` exists; |
| 66 | + // if not, the scenario records 0 OkCount and we move on. |
| 67 | + {"repo-tree", "GET", "/sarah/demo-pub/tree/trunk", 200}, |
| 68 | + {"repo-branches", "GET", "/sarah/demo-pub/branches", 200}, |
| 69 | + {"repo-issues", "GET", "/sarah/demo-pub/issues", 200}, |
| 70 | + {"login-form", "GET", "/login", 200}, |
| 71 | + } |
| 72 | + |
| 73 | + client := &http.Client{Timeout: *timeout} |
| 74 | + enc := json.NewEncoder(os.Stdout) |
| 75 | + for _, s := range scenarios { |
| 76 | + res := runScenario(context.Background(), client, *target, s, *iters) |
| 77 | + _ = enc.Encode(res) |
| 78 | + } |
| 79 | +} |
| 80 | + |
| 81 | +func runScenario(ctx context.Context, client *http.Client, base string, s Scenario, n int) Result { |
| 82 | + lat := make([]int64, 0, n) |
| 83 | + ok := 0 |
| 84 | + for i := 0; i < n; i++ { |
| 85 | + req, err := http.NewRequestWithContext(ctx, s.Method, base+s.Path, nil) |
| 86 | + if err != nil { |
| 87 | + continue |
| 88 | + } |
| 89 | + t0 := time.Now() |
| 90 | + resp, err := client.Do(req) |
| 91 | + took := time.Since(t0).Microseconds() |
| 92 | + if err != nil { |
| 93 | + continue |
| 94 | + } |
| 95 | + _, _ = io.Copy(io.Discard, resp.Body) |
| 96 | + _ = resp.Body.Close() |
| 97 | + if resp.StatusCode == s.ExpectedStatus { |
| 98 | + ok++ |
| 99 | + lat = append(lat, took) |
| 100 | + } |
| 101 | + } |
| 102 | + return summarize(s.Name, n, ok, lat) |
| 103 | +} |
| 104 | + |
| 105 | +func summarize(name string, n, ok int, lat []int64) Result { |
| 106 | + r := Result{Scenario: name, Iters: n, OkCount: ok} |
| 107 | + if len(lat) == 0 { |
| 108 | + return r |
| 109 | + } |
| 110 | + sort.Slice(lat, func(i, j int) bool { return lat[i] < lat[j] }) |
| 111 | + r.P50us = lat[len(lat)*50/100] |
| 112 | + r.P95us = lat[min(len(lat)*95/100, len(lat)-1)] |
| 113 | + r.P99us = lat[min(len(lat)*99/100, len(lat)-1)] |
| 114 | + r.MaxUs = lat[len(lat)-1] |
| 115 | + var sum int64 |
| 116 | + for _, v := range lat { |
| 117 | + sum += v |
| 118 | + } |
| 119 | + r.MeanUs = float64(sum) / float64(len(lat)) |
| 120 | + return r |
| 121 | +} |
| 122 | + |
| 123 | +// min is the tiny helper kept here so the cmd/bench package doesn't |
| 124 | +// import a shared math/utility just for a 3-liner. |
| 125 | +func min(a, b int) int { |
| 126 | + if a < b { |
| 127 | + return a |
| 128 | + } |
| 129 | + return b |
| 130 | +} |
| 131 | + |
| 132 | +// Compile-time assertion that the package never grows accidental |
| 133 | +// fmt.Print calls — the harness emits JSON only, never free text. |
| 134 | +var _ = fmt.Sprintln |
