From a35c0bb295a444589f8dc36623ded30ffea18c39 Mon Sep 17 00:00:00 2001 From: Arseny Balobanov Date: Sat, 15 Feb 2020 22:41:14 +0300 Subject: [PATCH] Adding http-digital-clock. --- digitalclock/README.md | 114 ++++++++++++ digitalclock/assets/150405.png | Bin 0 -> 196 bytes digitalclock/assets/150405_15.png | Bin 0 -> 1116 bytes digitalclock/main.go | 7 + digitalclock/main_test.go | 249 ++++++++++++++++++++++++++ digitalclock/symbols.go | 152 ++++++++++++++++ digitalclock/testdata/00:51:41_20.png | Bin 0 -> 1469 bytes digitalclock/testdata/02:06:08_11.png | Bin 0 -> 763 bytes digitalclock/testdata/02:07:50_29.png | Bin 0 -> 2739 bytes digitalclock/testdata/02:40:33_26.png | Bin 0 -> 2346 bytes digitalclock/testdata/03:05:12_9.png | Bin 0 -> 628 bytes digitalclock/testdata/03:55:20_19.png | Bin 0 -> 1498 bytes digitalclock/testdata/03:57:01_9.png | Bin 0 -> 615 bytes digitalclock/testdata/04:16:43_21.png | Bin 0 -> 1689 bytes digitalclock/testdata/04:49:37_14.png | Bin 0 -> 978 bytes 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digitalclock/testdata/21:21:21_14.png create mode 100644 digitalclock/testdata/22:14:54_27.png create mode 100644 digitalclock/testdata/22:16:10_20.png create mode 100644 digitalclock/testdata/22:48:18_10.png create mode 100644 digitalclock/testdata/22:55:07_23.png create mode 100644 digitalclock/testdata/23:43:50_25.png diff --git a/digitalclock/README.md b/digitalclock/README.md new file mode 100644 index 0000000..4528ad2 --- /dev/null +++ b/digitalclock/README.md @@ -0,0 +1,114 @@ +## digitalclock + +В этой задаче нужно написать http server, +который по запросу `/?time=hh:mm:ss` вернет PNG с данным временем. + +Сервер должен слушать порт, переданный через аргумент `--port`. + +### Примеры + +Запуск: +``` +$ digitalclock -port 6029 +``` + +После запуска можно открыть в браузере `http://localhost:6029/?time=15:04:05` и получить png наподобие этой: + +![Image description](assets/150405.png) + +Если параметр `time` не задан (или равен ""), сервен должен вернуть текущее время. +В этом случае при обновлении страницы картинка должна меняться. + +В запросе также нужно поддержать параметр 1 <=`k` <= 30, +который отвечает за увеличение картинки в `k` раз: + +http://localhost:6029/?time=15:04:05?k=15 + +![Image description](assets/150405_15.png) + +На невалидных `time` и `k` сервер должен возврщать произвольное сообщение об ошибке и http status 400 (Bad Request): + +``` +$ curl -i "http://localhost:6029/?k=100" +HTTP/1.1 400 Bad Request +Content-Type: text/plain; charset=utf-8 +X-Content-Type-Options: nosniff +Date: Fri, 14 Feb 2020 02:02:41 GMT +Content-Length: 10 + +invalid k +``` + +В случае успеха приложение должно возвращать http status 200 (OK), +а также проставлять http header `Content-Type: image/png`: + +``` +$ curl -i "http://localhost:6029/" +HTTP/1.1 200 OK +Content-Type: image/png +Date: Fri, 14 Feb 2020 02:08:19 GMT +Content-Length: 193 +... +``` + +### Формат + +`hh:mm:ss` + +В [./symbols.go](./symbols.go) определены строковые константы, кодирующие цифры и двоеточие. +Один символ константы (отличный от '\n') - 1 пиксель. +'.' должны кодироваться в белый цвет, '1' - в бирюзовый (переменная **Cyan** в [./symbols.go](./symbols.go)). +Все константы имеют одинаковую высоту `h`, все цифры имеют одинаковую ширину `w`. + +`k` отличный от 1 (default) превращает каждый пиксель `p` картинки в блок `k x k` пикселей `p`. +Высота результирующей картинки - `h * k`, ширина - `(6 * w + 2 * w_colon) * k`, +где `w_colon` ширина константы, соответствующей ':'. + +### Проверка решения + +Для запуска тестов нужно выполнить следующую команду: + +``` +go test -v ./digitalclock/... +``` + +### Запуск программы + +``` +go run -v ./digitalclock/... +``` + +### Компиляция + +``` +go install ./digitalclock/... +``` + +После выполнения в `$GOPATH/bin` появится исполняемый файл с именем `digitalclock`. + +### Walkthrough + +1. парсинг аргументов командной строки https://gobyexample.com/command-line-flags +2. http server: https://p.go.manytask.org/00-intro/lecture.slide#23 +3. url params: https://golang.org/pkg/net/url/#URL.Query +3. форматирование времени: https://gobyexample.com/time-formatting-parsing +4. работа с картинками: https://golang.org/pkg/image/ + +Пример, создания простой png размера 5x5: +```go +package main + +import ( + "image" + "image/color" + "image/png" + "os" +) + +func main() { + img := image.NewRGBA(image.Rect(0, 0, 5, 5)) + img.Set(2, 2, color.RGBA{255, 0, 0, 255}) + f, _ := os.Create("/tmp/img.png") + png.Encode(f, img) +} +``` diff --git a/digitalclock/assets/150405.png b/digitalclock/assets/150405.png new file mode 100644 index 0000000000000000000000000000000000000000..e9c67b2365cab80669f55488aef9d98a00aa833e GIT binary patch literal 196 zcmeAS@N?(olHy`uVBq!ia0vp^7C_9y!2~3C@W1>7q`Ey_978JRB>nvV-~Mm_gHFbu zE0fhFB_z^j&pv$f1cOrFO1WU(WtK}`xeBK%T})E# zKpiKGg;lFK+ch@rJkp}4w|5DXNj0ani1370F{@r2eIAhFJn?V4w)o|c_Zv=p-4P^V usH&vr&=a?28ShMiR2i*M4Fv{<|NkFO@nd}*d*LY1Sqz@8elF{r5}E)_9Y^*6 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"image/png" + "io/ioutil" + "net/http" + "net/url" + "os" + "os/exec" + "path" + "strconv" + "strings" + "testing" + "time" + + "github.com/stretchr/testify/require" + "gitlab.com/slon/shad-go/tools/testtool" +) + +const importPath = "gitlab.com/slon/shad-go/digitalclock" + +var binCache testtool.BinCache + +func TestMain(m *testing.M) { + os.Exit(func() int { + var teardown testtool.CloseFunc + binCache, teardown = testtool.NewBinCache() + defer teardown() + + return m.Run() + }()) +} + +func startServer(t *testing.T) (port string, stop func()) { + binary, err := binCache.GetBinary(importPath) + require.NoError(t, err) + + port, err = testtool.GetFreePort() + require.NoError(t, err, "unable to get free port") + + cmd := exec.Command(binary, "-port", port) + cmd.Stdout = nil + cmd.Stderr = os.Stderr + + require.NoError(t, cmd.Start()) + + done := make(chan error) + go func() { + done <- cmd.Wait() + }() + + stop = func() { + _ = cmd.Process.Kill() + <-done + } + + ctx, cancel := context.WithTimeout(context.Background(), time.Second*30) + defer cancel() + + testtool.WaitForPort(ctx, port) + if ctx.Err() != nil { + err = ctx.Err() + stop() + } + + require.NoError(t, err) + return +} + +func readImage(fname string) (image.Image, error) { + f, err := os.Open(fname) + if err != nil { + return nil, fmt.Errorf("unable to open %s: %w", fname, err) + } + defer func() { _ = f.Close() }() + + img, _, err := image.Decode(f) + if err != nil { + return nil, fmt.Errorf("unable to decode %s: %w", fname, err) + } + + return img, nil +} + +func abs(a, b uint32) int64 { + if a > b { + return int64(a - b) + } + return int64(b - a) +} + +func calcImgDiff(i1, i2 image.Image) float64 { + w, h := i1.Bounds().Dx(), i1.Bounds().Dy() + + var sum int64 + for x := 0; x < w; x++ { + for y := 0; y < h; y++ { + r1, g1, b1, _ := i1.At(x, y).RGBA() + r2, g2, b2, _ := i2.At(x, y).RGBA() + sum += abs(r1, r2) + sum += abs(g1, g2) + sum += abs(b1, b2) + } + } + + return float64(sum) / (float64(w*h) * 0xffff * 3) * 100.0 +} + +func queryImage(t *testing.T, c *http.Client, url string) image.Image { + t.Logf("querying: %s", url) + + resp, err := c.Get(url) + require.NoError(t, err) + defer func() { _ = resp.Body.Close() }() + + require.Equal(t, http.StatusOK, resp.StatusCode) + require.Equal(t, "image/png", resp.Header.Get("Content-Type")) + + img, err := png.Decode(resp.Body) + require.Nil(t, err) + + return img +} + +func TestDigitalClock_valid(t *testing.T) { + port, stop := startServer(t) + defer stop() + + files, err := ioutil.ReadDir("./testdata") + require.Nil(t, err) + + c := &http.Client{Timeout: time.Second * 10} + + for _, f := range files { + t.Run(f.Name(), func(t *testing.T) { + parts := strings.SplitN(strings.TrimSuffix(f.Name(), ".png"), "_", 2) + + v := url.Values{} + v.Add("time", parts[0]) + v.Add("k", parts[1]) + + u := fmt.Sprintf("http://localhost:%s/?%s", port, v.Encode()) + img := queryImage(t, c, u) + + expected, err := readImage(path.Join("testdata", f.Name())) + require.NoError(t, err) + + w, h := img.Bounds().Dx(), img.Bounds().Dy() + ew, eh := expected.Bounds().Dx(), expected.Bounds().Dy() + if w != ew || h != eh { + t.Errorf("expected size %d x %d got %d x %d", ew, eh, w, h) + } + + diff := calcImgDiff(img, expected) + t.Logf("image diff: %.2f %%", diff) + require.True(t, diff < 1.0, + fmt.Sprintf("%s images are too different (%.2f %%)", f.Name(), diff)) + }) + } +} + +func TestDigitalClock_invalid(t *testing.T) { + port, stop := startServer(t) + defer stop() + + c := &http.Client{Timeout: time.Second * 10} + + type TestCase struct { + Time string `json:"time"` + K string `json:"k"` + } + + testName := func(tc *TestCase) string { + data, err := json.Marshal(tc) + require.Nil(t, err) + return string(data) + } + + for _, tc := range []*TestCase{ + {K: "0"}, + {K: "31"}, + {K: "2.5"}, + {K: "f"}, + {Time: "15:04"}, + {Time: "15:04:0"}, + {Time: "3:04:05"}, + {Time: "15:4:05"}, + {Time: "24:00:00"}, + {Time: "00:00:60"}, + {Time: "f"}, + } { + t.Run(testName(tc), func(t *testing.T) { + v := url.Values{} + if tc.Time != "" { + v.Add("time", tc.Time) + } + if tc.K != "" { + v.Add("k", tc.K) + } + + u := fmt.Sprintf("http://localhost:%s/?%s", port, v.Encode()) + t.Logf("querying: %s", u) + + resp, err := c.Get(u) + require.NoError(t, err) + defer func() { _ = resp.Body.Close() }() + + require.Equal(t, http.StatusBadRequest, resp.StatusCode) + }) + } +} + +func TestDigitalClock_now(t *testing.T) { + port, stop := startServer(t) + defer stop() + + c := &http.Client{Timeout: time.Second * 10} + + for _, k := range []int{1, 10, 29} { + k := k + t.Run(fmt.Sprintf("k=%d", k), func(t *testing.T) { + v := url.Values{"k": []string{strconv.Itoa(k)}} + u := fmt.Sprintf("http://localhost:%s/?%s", port, v.Encode()) + img := queryImage(t, c, u) + + w, h := img.Bounds().Dx(), img.Bounds().Dy() + ew, eh := getExpectedWidth(k), getExpectedHeight(k) + if w != ew || h != eh { + t.Errorf("expected size %d x %d got %d x %d", ew, eh, w, h) + } + }) + } +} + +func getSymbolWidth(s string) int { + return len(strings.SplitN(s, "\n", 2)[0]) +} + +func getExpectedWidth(k int) int { + return (getSymbolWidth(Zero)*6 + getSymbolWidth(Colon)*2) * k +} + +func getExpectedHeight(k int) int { + return len(strings.Split(Zero, "\n")) * k +} diff --git a/digitalclock/symbols.go b/digitalclock/symbols.go new file mode 100644 index 0000000..8578102 --- /dev/null +++ b/digitalclock/symbols.go @@ -0,0 +1,152 @@ +// +build !change + +package main + +import "image/color" + +var Cyan = color.RGBA{R: 100, G: 200, B: 200, A: 0xff} + +const ( + Zero = `........ +.111111. +.111111. +.11..11. +.11..11. +.11..11. +.11..11. +.11..11. +.11..11. +.111111. +.111111. +........` + + One = `........ +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +........` + + Two = `........ +.111111. +.111111. +.....11. +.....11. +.111111. +.111111. +.11..... +.11..... +.111111. +.111111. +........` + + Three = `........ +.111111. +.111111. +.....11. +.....11. +.111111. +.111111. +.....11. +.....11. +.111111. +.111111. +........` + + Four = `........ +.11..11. +.11..11. +.11..11. +.11..11. +.111111. +.111111. +.....11. +.....11. +.....11. +.....11. +........` + + Five = `........ +.111111. +.111111. +.11..... +.11..... +.111111. +.111111. +.....11. +.....11. +.111111. +.111111. +........` + + Six = `........ +.111111. +.111111. +.11..... +.11..... +.111111. +.111111. +.11..11. +.11..11. +.111111. +.111111. +........` + + Seven = `........ +.111111. +.111111. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +.....11. +........` + + Eight = `........ +.111111. +.111111. +.11..11. +.11..11. +.111111. +.111111. +.11..11. +.11..11. +.111111. +.111111. +........` + + Nine = `........ +.111111. +.111111. +.11..11. +.11..11. +.111111. +.111111. +.....11. +.....11. +.....11. +.....11. +........` + + Colon = `.... +.... +.... +.... +.11. +.11. +.... 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