Resolve "url-fetch"
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4 changed files with 244 additions and 0 deletions
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@ -8,3 +8,5 @@
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score: 100
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- task: wordcount
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score: 100
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- task: urlfetch
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score: 100
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51
urlfetch/README.md
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51
urlfetch/README.md
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@ -0,0 +1,51 @@
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## urlfetch
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В этой задаче нужно написать консольную утилиту,
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которая принимает на вход произвольное количество http URL'ов и последоватльно скачивает их содержимое.
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При обработке невалидного URL'а программа должна завершаться с ненулевым exit кодом.
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### Примеры
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Успешный запуск:
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```
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$ urlfetch https://golang.org https://go.dev
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<!DOCTYPE html>
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<html lang="en">
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<meta charset="utf-8">
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<meta name="description" content="Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.">
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...
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```
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Неуспешный запуск:
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```
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$ urlfetch golang.org
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fetch: Get golang.org: unsupported protocol scheme ""
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```
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### Проверка решения
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Для запуска тестов нужно выполнить следующую команду:
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```
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go test -v ./urlfetch/...
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```
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### Запуск программы
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```
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go run -v ./urlfetch/main.go
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```
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### Компиляция
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```
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go install ./urlfetch/...
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```
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После выполнения в `$GOPATH/bin` появится исполняемый файл с именем `urlfetch`.
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### Walkthrough
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1. Чтение аргументов командной строки: https://gobyexample.com/command-line-arguments
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2. HTTP запрос: https://gobyexample.com/http-clients
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7
urlfetch/main.go
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7
urlfetch/main.go
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@ -0,0 +1,7 @@
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// +build !solution
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package main
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func main() {
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}
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184
urlfetch/main_test.go
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184
urlfetch/main_test.go
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@ -0,0 +1,184 @@
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// +build !change
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package main
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import (
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"bytes"
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"fmt"
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"net/http"
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"net/http/httptest"
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"os"
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"os/exec"
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"strconv"
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"sync"
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"testing"
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"github.com/stretchr/testify/require"
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"gitlab.com/slon/shad-go/tools/testtool"
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)
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const urlfetchImportPath = "gitlab.com/slon/shad-go/urlfetch"
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var binCache testtool.BinCache
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func TestMain(m *testing.M) {
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os.Exit(func() int {
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var teardown testtool.CloseFunc
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binCache, teardown = testtool.NewBinCache()
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defer teardown()
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return m.Run()
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}())
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}
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func TestUrlFetch_valid(t *testing.T) {
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binary, err := binCache.GetBinary(urlfetchImportPath)
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require.Nil(t, err)
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type endpoint string
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type response string
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for _, tc := range []struct {
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name string
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h http.HandlerFunc
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queries []endpoint
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expected []response
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}{
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{
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name: "404",
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h: func(w http.ResponseWriter, r *http.Request) {
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http.Error(w, "The requested URL was not found.", http.StatusNotFound)
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},
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queries: []endpoint{"/" + endpoint(testtool.RandomName())},
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expected: []response{"The requested URL was not found."},
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},
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{
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name: "200",
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h: func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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_, _ = w.Write([]byte("The requested URL was found.\n"))
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},
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queries: []endpoint{"/"},
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expected: []response{"The requested URL was found.\n"},
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},
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{
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name: "multiple-urls",
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h: func(w http.ResponseWriter, r *http.Request) {
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mux := http.NewServeMux()
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mux.HandleFunc("/foo", func(w http.ResponseWriter, h *http.Request) {
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_, _ = w.Write([]byte("foo"))
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})
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mux.HandleFunc("/bar", func(w http.ResponseWriter, h *http.Request) {
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_, _ = w.Write([]byte("bar"))
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})
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mux.ServeHTTP(w, r)
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},
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queries: []endpoint{"/foo", "/bar"},
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expected: []response{"foo", "bar"},
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},
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} {
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t.Run(tc.name, func(t *testing.T) {
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s := httptest.NewServer(tc.h)
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defer s.Close()
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urls := make([]string, len(tc.queries))
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for i, q := range tc.queries {
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urls[i] = s.URL + string(q)
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}
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cmd := exec.Command(binary, urls...)
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cmd.Stdout = nil
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cmd.Stderr = os.Stderr
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data, err := cmd.Output()
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require.Nil(t, err)
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for _, r := range tc.expected {
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require.True(t, bytes.Contains(data, []byte(r)),
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fmt.Sprintf(`output="%s" does not contain expected response="%s"`, data, r))
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}
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})
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}
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}
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func TestUrlFetch_malformed(t *testing.T) {
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binary, err := binCache.GetBinary(urlfetchImportPath)
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require.Nil(t, err)
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s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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_, _ = w.Write([]byte("success"))
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}))
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defer s.Close()
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for _, tc := range []struct {
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name string
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urls []string
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}{
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{
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name: "invalid-protocol-scheme",
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urls: []string{"golang.org"},
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},
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{
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name: "valid+invalid",
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urls: []string{s.URL, "golang.org"},
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},
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} {
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t.Run(tc.name, func(t *testing.T) {
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cmd := exec.Command(binary, tc.urls...)
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cmd.Stdout = nil
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cmd.Stderr = os.Stderr
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err = cmd.Run()
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if e, ok := err.(*exec.ExitError); ok && !e.Success() {
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return
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}
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t.Fatalf("process ran with err=%v, want exit status != 0", err)
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})
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}
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}
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func TestUrlFetch_order(t *testing.T) {
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binary, err := binCache.GetBinary(urlfetchImportPath)
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require.Nil(t, err)
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mux := http.NewServeMux()
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var expectedCallOrder []int
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var mu sync.Mutex
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var callOrder []int
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n := 1000
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for i := 0; i < n; i++ {
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i := i
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expectedCallOrder = append(expectedCallOrder, i)
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s := strconv.Itoa(i)
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mux.HandleFunc("/"+s, func(w http.ResponseWriter, h *http.Request) {
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mu.Lock()
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callOrder = append(callOrder, i)
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mu.Unlock()
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_, _ = w.Write([]byte(s))
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})
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}
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s := httptest.NewServer(mux)
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defer s.Close()
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urls := make([]string, n)
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for i := 0; i < n; i++ {
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urls[i] = s.URL + "/" + strconv.Itoa(i)
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}
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cmd := exec.Command(binary, urls...)
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cmd.Stdout = nil
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cmd.Stderr = os.Stderr
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require.Nil(t, cmd.Run())
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mu.Lock()
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defer mu.Unlock()
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require.Equal(t, expectedCallOrder, callOrder)
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}
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