Kadai4 akuchii

kadai4/akuchii/fortune/export_test.go

@@ -0,0 +1,5 @@
+package fortune
+
+func (f Fortune) GetFortuneList() []string {
+	return fortuneList
+}

kadai4/akuchii/fortune/fortune.go

@@ -0,0 +1,78 @@
+package fortune
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+var fortuneList = []string{"大吉", "吉", "中吉", "小吉", "末吉", "凶", "大凶"}
+
+// Clock is interface to get current time
+type Clock interface {
+	GetCurrentTime() time.Time
+}
+
+// DefaultClock equals current time
+type DefaultClock struct{}
+
+// Fortune lots fortune depends on time
+type Fortune struct {
+	clock Clock
+}
+
+// LotResult contains result of fortune
+type LotResult struct {
+	Result string `json:"result"`
+}
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+// GetCurrentTime returns current time
+func (d DefaultClock) GetCurrentTime() time.Time {
+	return time.Now()
+}
+
+// NewFortune returns fortune instance
+func NewFortune(c Clock) *Fortune {
+	return &Fortune{clock: c}
+}
+
+func (f Fortune) lotForNewYearDay() string {
+	return "大吉"
+}
+
+func (f Fortune) defaultLot() string {
+	return fortuneList[rand.Intn(len(fortuneList))]
+}
+
+func (f Fortune) isNewYearDay() bool {
+	c := f.clock.GetCurrentTime()
+
+	return c.Month() == 1 && 1 <= c.Day() && c.Day() <= 3
+}
+
+// Lot lots fortune
+func (f Fortune) Lot() string {
+	if f.isNewYearDay() {
+		return f.lotForNewYearDay()
+	}
+	return f.defaultLot()
+}
+
+// Handler returns fortune result
+func (f Fortune) Handler(w http.ResponseWriter, r *http.Request) {
+	var buf bytes.Buffer
+	fr := LotResult{Result: f.Lot()}
+	enc := json.NewEncoder(&buf)
+	if err := enc.Encode(fr); err != nil {
+		log.Fatal(err)
+	}
+	fmt.Fprint(w, buf.String())
+}

kadai4/akuchii/fortune/fortune_test.go

@@ -0,0 +1,72 @@
+package fortune_test
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/gopherdojo/dojo4/kadai4/akuchii/fortune"
+)
+
+func TestFortune_Handler(t *testing.T) {
+	f := fortune.NewFortune(fortune.DefaultClock{})
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest("GET", "/", nil)
+	f.Handler(w, r)
+	rw := w.Result()
+	defer rw.Body.Close()
+	if rw.StatusCode != http.StatusOK {
+		t.Fatal("unexpected status code")
+	}
+	b, err := ioutil.ReadAll(rw.Body)
+	if err != nil {
+		t.Fatal("unexpected error")
+	}
+
+	fr := &fortune.LotResult{}
+	if err := json.Unmarshal(b, &fr); err != nil {
+		t.Fatal("failed json unmarshal")
+	}
+
+	var fortuneList = f.GetFortuneList()
+	contain := false
+	for _, v := range fortuneList {
+		if v == fr.Result {
+			contain = true
+			break
+		}
+	}
+
+	if !contain {
+		t.Fatalf("unexpected response: %s", string(b))
+	}
+}
+
+type MockClock struct {
+	currentTime time.Time
+}
+
+func (mc MockClock) GetCurrentTime() time.Time {
+	return mc.currentTime
+}
+
+func TestFortune_LotOnNewYearDay(t *testing.T) {
+	cases := []struct {
+		newYearDay time.Time
+	}{
+		{time.Date(2019, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2018, 1, 2, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2017, 1, 3, 23, 59, 59, 0, time.UTC)},
+	}
+	for _, c := range cases {
+		mc := &MockClock{c.newYearDay}
+		f := fortune.NewFortune(mc)
+		result := f.Lot()
+		if result != "大吉" {
+			t.Errorf("unexpected result: %s on %v", result, mc.GetCurrentTime())
+		}
+	}
+}

kadai4/akuchii/main.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/gopherdojo/dojo4/kadai4/akuchii/fortune"
+)
+
+func main() {
+	f := fortune.NewFortune(fortune.DefaultClock{})
+	http.HandleFunc("/", f.Handler)
+	http.ListenAndServe(":8080", nil)
+}