optimize: longUrl cache

Dockerfile

@@ -1,10 +1,10 @@
 FROM golang:1.20-alpine AS build
+RUN apk update && apk add upx
 WORKDIR /app
 COPY main.go go.mod go.sum .
 RUN go mod tidy
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o myurls main.go
-RUN apk update && apk add upx
-RUN upx myurls
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o myurls main.go \
+    && upx myurls
 
 FROM scratch
 WORKDIR /app

Makefile

@@ -1,6 +1,7 @@
 BINARY_DEFAULT="build/myurls"
 BINARY_LINUX="build/myurls-linux-amd64"
 BINARY_DARWIN="build/myurls-darwin-amd64"
+BINARY_DARWIN_ARM64="build/myurls-darwin-arm64"
 BINARY_WINDOWS="build/myurls-windows-x64"
 BINARY_ARM64="build/myurls-linux-arm64"
 
@@ -10,13 +11,15 @@ BUILD=`date +%FT%T%z`
 
 default:
 	@echo ${BINARY_DEFAULT}
-	@go build -ldflags="-s -w" -o ${BINARY_DEFAULT} ${GOFILES}
+	@CGO_ENABLED=0 go build -ldflags="-s -w" -o ${BINARY_DEFAULT} ${GOFILES}
 
 all:
 	@echo ${BINARY_LINUX}
 	@CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o ${BINARY_LINUX} ${GOFILES}
 	# @echo ${BINARY_DARWIN}
 	# @CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o ${BINARY_DARWIN} ${GOFILES}
+	# @echo ${BINARY_DARWIN_ARM64}
+	# @CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags="-s -w" -o ${BINARY_DARWIN_ARM64} ${GOFILES}
 	@echo ${BINARY_WINDOWS}
 	@CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o ${BINARY_WINDOWS} ${GOFILES}
 	@echo ${BINARY_ARM64}
@@ -48,5 +51,6 @@ clean:
 	@if [ -f ${BINARY_DEFAULT} ] ; then rm ${BINARY_DEFAULT} ; fi
 	@if [ -f ${BINARY_LINUX} ] ; then rm ${BINARY_LINUX} ; fi
 	@if [ -f ${BINARY_DARWIN} ] ; then rm ${BINARY_DARWIN} ; fi
+	@if [ -f ${BINARY_DARWIN_ARM64} ] ; then rm ${BINARY_DARWIN_ARM64} ; fi
 	@if [ -f ${BINARY_WINDOWS} ] ; then rm ${BINARY_WINDOWS} ; fi
 	@if [ -f ${BINARY_ARM64} ] ; then rm ${BINARY_ARM64} ; fi

go.mod

@@ -9,19 +9,17 @@ require (
 )
 
 require (
-	github.com/bytedance/sonic v1.8.6 // indirect
+	github.com/bytedance/sonic v1.8.8 // indirect
 	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.12.0 // indirect
+	github.com/go-playground/validator/v10 v10.13.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/golang/protobuf v1.5.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
-	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
-	github.com/leodido/go-urn v1.2.2 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
 	github.com/mattn/go-isatty v0.0.18 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
@@ -29,12 +27,11 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.11 // indirect
 	golang.org/x/arch v0.3.0 // indirect
-	golang.org/x/crypto v0.7.0 // indirect
-	golang.org/x/net v0.8.0 // indirect
-	golang.org/x/sys v0.6.0 // indirect
-	golang.org/x/text v0.8.0 // indirect
+	golang.org/x/crypto v0.8.0 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
 	google.golang.org/protobuf v1.30.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
-	gopkg.in/yaml.v2 v2.2.8 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,6 +1,8 @@
 github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
 github.com/bytedance/sonic v1.8.6 h1:aUgO9S8gvdN6SyW2EhIpAw5E4ChworywIEndZCkCVXk=
 github.com/bytedance/sonic v1.8.6/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
+github.com/bytedance/sonic v1.8.8 h1:Kj4AYbZSeENfyXicsYppYKO0K2YWab+i2UTSY7Ukz9Q=
+github.com/bytedance/sonic v1.8.8/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
 github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 h1:qSGYFH7+jGhDF8vLC+iwCD4WpbV1EBDSzWkJODFLams=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
@@ -10,135 +12,103 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
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 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
-github.com/gin-gonic/gin v1.7.0 h1:jGB9xAJQ12AIGNB4HguylppmDK1Am9ppF7XnGXXJuoU=
-github.com/gin-gonic/gin v1.7.0/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjXkfUtY=
 github.com/gin-gonic/gin v1.9.0 h1:OjyFBKICoexlu99ctXNR2gg+c5pKrKMuyjgARg9qeY8=
 github.com/gin-gonic/gin v1.9.0/go.mod h1:W1Me9+hsUSyj3CePGrd1/QrKJMSJ1Tu/0hFEH89961k=
-github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A=
-github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
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-github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q=
-github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
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-github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=
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main.go

@@ -1,7 +1,9 @@
 package main
 
 import (
+	"crypto/md5"
 	"encoding/base64"
+	"encoding/hex"
 	"flag"
 	"fmt"
 	"log"
@@ -16,6 +18,7 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+// Response is the response structure
 type Response struct {
 	Code     int
 	Message  string
@@ -23,6 +26,7 @@ type Response struct {
 	ShortUrl string
 }
 
+// redisPoolConf is the Redis pool configuration.
 type redisPoolConf struct {
 	maxIdle        int
 	maxActive      int
@@ -33,19 +37,37 @@ type redisPoolConf struct {
 	handleTimeout  int
 }
 
+// letterBytes is a string containing all the characters used in the short URL generation.
 const letterBytes = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 
+// shortUrlLen is the length of the generated short URL.
+const shortUrlLen = 7
+
+// defaultPort is the default port number.
 const defaultPort int = 8002
+
+// defaultExpire is the redis ttl in days for a short URL.
 const defaultExpire = 180
+
+// defaultRedisConfig is the default Redis configuration.
 const defaultRedisConfig = "127.0.0.1:6379"
 
+// defaultLockPrefix is the default prefix for Redis locks.
 const defaultLockPrefix = "myurls:lock:"
+
+// defaultRenewal is the default renewal time for Redis locks.
 const defaultRenewal = 1
 
+// secondsPerDay is the number of seconds in a day.
 const secondsPerDay = 24 * 3600
 
+// redisPool is a connection pool for Redis.
 var redisPool *redis.Pool
+
+// redisPoolConfig is the Redis pool configuration.
 var redisPoolConfig *redisPoolConf
+
+// redisClient is a Redis client.
 var redisClient redis.Conn
 
 func main() {
@@ -87,6 +109,7 @@ func main() {
 		})
 	})
 
+	// 短链接生成
 	router.POST("/short", func(context *gin.Context) {
 		res := &Response{
 			Code:     1,
@@ -138,6 +161,7 @@ func main() {
 		context.JSON(200, *res)
 	})
 
+	// 短链接跳转
 	router.GET("/:shortKey", func(context *gin.Context) {
 		shortKey := context.Param("shortKey")
 		longUrl := shortToLong(shortKey)
@@ -173,7 +197,9 @@ func longToShort(longUrl string, ttl int) string {
 	defer redisClient.Close()
 
 	// 是否生成过该长链接对应短链接
-	_existsKey, _ := redis.String(redisClient.Do("get", longUrl))
+	longUrlMD5Bytes := md5.Sum([]byte(longUrl))
+	longUrlMD5 := hex.EncodeToString(longUrlMD5Bytes[:])
+	_existsKey, _ := redis.String(redisClient.Do("get", longUrlMD5))
 	if _existsKey != "" {
 		_, _ = redisClient.Do("expire", _existsKey, ttl)
 
@@ -184,7 +210,7 @@ func longToShort(longUrl string, ttl int) string {
 	// 重试三次
 	var shortKey string
 	for i := 0; i < 3; i++ {
-		shortKey = generate(7)
+		shortKey = generate(shortUrlLen)
 
 		_existsLongUrl, _ := redis.String(redisClient.Do("get", shortKey))
 		if _existsLongUrl == "" {
@@ -193,10 +219,10 @@ func longToShort(longUrl string, ttl int) string {
 	}
 
 	if shortKey != "" {
-		_, _ = redisClient.Do("mset", shortKey, longUrl, longUrl, shortKey)
+		_, _ = redisClient.Do("mset", shortKey, longUrl, longUrlMD5, shortKey)
 
 		_, _ = redisClient.Do("expire", shortKey, ttl)
-		_, _ = redisClient.Do("expire", longUrl, secondsPerDay)
+		_, _ = redisClient.Do("expire", longUrlMD5, secondsPerDay)
 	}
 
 	return shortKey
@@ -222,16 +248,23 @@ func renew(shortKey string) {
 	}
 }
 
-// 产生一个63位随机整数
+// generate is a function that takes an integer bits and returns a string.
+// The function generates a random string of length equal to bits using the letterBytes slice.
+// The letterBytes slice contains characters that can be used to generate a random string.
+// The generation of the random string is based on the current time using the UnixNano() function.
 func generate(bits int) string {
+	// Create a byte slice b of length bits.
 	b := make([]byte, bits)
 
-	currentTime := time.Now().UnixNano()
-	rand.Seed(currentTime)
+	// Create a new random number generator with the current time as the seed.
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
 
+	// Generate a random byte for each element in the byte slice b using the letterBytes slice.
 	for i := range b {
-		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+		b[i] = letterBytes[r.Intn(len(letterBytes))]
 	}
+
+	// Convert the byte slice to a string and return it.
 	return string(b)
 }