Add sample

.gitignore

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+vendor/
+sample-redigo
+*.rdb

Gopkg.toml

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+# Gopkg.toml example
+#
+# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+[prune]
+  go-tests = true
+  unused-packages = true

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2018 g0tiu5a
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+app:
+	go build

app.go

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+package main
+
+// Document of redigo
+// https://godoc.org/github.com/gomodule/redigo/redis
+
+// Commands of redis
+// https://redis.io/commands
+
+import (
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	redis "github.com/gomodule/redigo/redis"
+	"github.com/labstack/echo"
+)
+
+var (
+	redisPool *redis.Pool
+)
+
+type Renderer struct {
+	templates *template.Template
+}
+
+func (r *Renderer) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
+	return r.templates.ExecuteTemplate(w, name, data)
+}
+
+func redisIncr(key string) error {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	// 基本的にredisのコマンドをそのまま呼び出す
+	_, err := redisConn.Do("INCR", key)
+	return err
+}
+
+func redisSet(key string, val string) error {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	_, err := redisConn.Do("SET", key, val)
+	return err
+}
+
+func redisSetInt(key string, val int64) error {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	// 引数はstringにしておく必要がある
+	_, err := redisConn.Do("SET", key, strconv.FormatInt(val, 10))
+	return err
+}
+
+func redisGet(key string) string {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	// 値を取り出す時には redis.XXX を使う
+	str, err := redis.String(redisConn.Do("GET", key))
+	if err == nil {
+		// 正常
+	} else if err == redis.ErrNil {
+		// nilが返ってきた
+		return ""
+	} else {
+		log.Printf("something wrong: %v\n", str)
+		// panic()
+		return ""
+	}
+	return str
+}
+
+func redisGetInt(key string) int64 {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	res, err := redis.Int64(redisConn.Do("GET", key)) // keyがない時には0を返す
+	if err == nil {
+		// 正常
+	} else if err == redis.ErrNil {
+		// nilが返ってきた
+	} else {
+		log.Printf("something wrong: %v\n", res)
+		// panic()
+		return 0
+	}
+	return res
+}
+
+func getInitialize(c echo.Context) error {
+	redisConn := redisPool.Get()
+	defer redisConn.Close()
+
+	redisConn.Do("FLUSHALL")
+	return c.String(204, "")
+}
+
+func getObject(c echo.Context) error {
+	key := c.QueryParam("key")
+	str := redisGet(key)
+	return c.String(http.StatusOK, str)
+}
+
+func postObject(c echo.Context) error {
+	key := c.FormValue("key")
+	val := c.FormValue("val")
+	if err := redisSet(key, val); err != nil {
+		return c.String(http.StatusInternalServerError, "InternalServerError")
+	}
+	return c.String(http.StatusOK, "Success")
+}
+
+func postIncrObject(c echo.Context) error {
+	key := c.FormValue("key")
+	if err := redisIncr(key); err != nil {
+		return c.String(http.StatusInternalServerError, "InternalServerError")
+	}
+	return c.String(http.StatusOK, "Success")
+}
+
+func getIndex(c echo.Context) error {
+	return c.Render(http.StatusOK, "index", nil)
+}
+
+func main() {
+	e := echo.New()
+
+	redisHost := os.Getenv("REDIS_HOST")
+	if redisHost == "" {
+		redisHost = "localhost"
+	}
+	// 接続を確立する
+	redisPool = &redis.Pool{
+		MaxIdle:     3,
+		IdleTimeout: 240 * time.Second,
+		Dial: func() (redis.Conn, error) {
+			c, err := redis.Dial("tcp", fmt.Sprintf("%v:6379", redisHost))
+			if err != nil {
+				log.Fatalln("Can not connect to redis.")
+				return nil, err
+			}
+			return c, err
+		},
+	}
+
+	e.Renderer = &Renderer{
+		templates: template.Must(template.ParseGlob("views/*.html")),
+	}
+
+	e.GET("/initialize", getInitialize)
+	e.GET("/", getIndex)
+	e.GET("/get", getObject)
+	e.POST("/set", postObject)
+	e.POST("/increment", postIncrObject)
+
+	e.Start(":5000")
+}

views/index.html

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+{{- define "index" -}}
+<html>
+  <body>
+    <h2>/get</h2>
+    <form method="GET" action="/get">
+      Key:<input name="key" type="text">
+      <input type="submit" value="Submit">
+    </form>
+    <h2>/set</h2>
+    <form method="POST" action="/set">
+      Key:<input name="key" type="text">
+      Val:<input name="val" type="text">
+      <input type="submit" value="Submit">
+    </form>
+    <h2>/increment</h2>
+    <form method="POST" action="/increment">
+      Key:<input name="key" type="text">
+      <input type="submit" value="Submit">
+    </form>
+  </body>
+</html>
+{{- end -}}