diff --git a/.env b/.env new file mode 100644 index 0000000..1f86421 --- /dev/null +++ b/.env @@ -0,0 +1,3 @@ +PORT=8000 +DB_HOST = 27017 +DB_COLLECTION = "cluster1" \ No newline at end of file diff --git a/controller/controller.go b/controller/controller.go new file mode 100644 index 0000000..4946257 --- /dev/null +++ b/controller/controller.go @@ -0,0 +1,127 @@ +package controller + +import ( + "context" + "fmt" + "github.com/gin-gonic/gin" + "github.com/rimo02/url-shortener/database" + "github.com/rimo02/url-shortener/helper" + "github.com/rimo02/url-shortener/models" + "go.mongodb.org/mongo-driver/bson" + "go.mongodb.org/mongo-driver/bson/primitive" + "go.mongodb.org/mongo-driver/mongo" + "log" + "net/http" + "os" + "time" +) + +func ShortenTheUrl(c *gin.Context) { + + var req models.Request + + collection := database.GetCollection(database.Client, os.Getenv("DB_COLLECTION")) + ctx, cancel := context.WithTimeout(context.TODO(), 10*time.Second) + + defer cancel() + + if err := c.ShouldBindJSON(&req); err != nil { + c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()}) + } + + shortUrl := helper.Shortener(6) //generate a random string of 6 length total combinations = 62^6 + resp := &models.Response{ + ID: primitive.NewObjectID(), + LongUrl: req.LongUrl, + ShortUrl: shortUrl, + Hits: 0, + ExpiresAt: int(time.Now().Add(24 * time.Hour).Unix()), // will expire after 1 day + LastRequestTime: int(time.Now().Unix()), + } + _, err := collection.InsertOne(ctx, resp) + if err != nil { + c.JSON(http.StatusInternalServerError, gin.H{"message": "unable to shorten the url"}) + return + } + c.JSON(http.StatusOK, gin.H{ + "LongUrl": req.LongUrl, + "ShortUrl": fmt.Sprintf("http://localhost:%s/%s", os.Getenv("PORT"), resp.ShortUrl), + "Expires At": resp.ExpiresAt, + }) + +} + +func GetTheUrl(c *gin.Context) { + shortUrl := c.Param("shorturl") + + var result models.Response + + collection := database.GetCollection(database.Client, os.Getenv("DB_COLLECTION")) + ctx, cancel := context.WithTimeout(context.TODO(), 20*time.Second) + defer cancel() + err := collection.FindOne(ctx, bson.M{"surl": shortUrl}).Decode(&result) + if err == mongo.ErrNoDocuments { + for i := 0; i < 3; i++ { + time.Sleep(1 * time.Second) + err := collection.FindOne(ctx, bson.M{"surl": shortUrl}).Decode(&result) + if err == nil { + collection.UpdateOne( + context.TODO(), + bson.M{"surl": shortUrl}, + bson.M{"$inc": bson.M{"hits": 1}}, + ) + c.Redirect(http.StatusMovedPermanently, result.LongUrl) + } else { + continue + } + + } + c.JSON(http.StatusNotFound, gin.H{"message": "url not found"}) + return + } else if err != nil { + c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()}) + return + } + + collection.UpdateOne( + context.TODO(), + bson.M{"surl": shortUrl}, + bson.M{"$inc": bson.M{"hits": 1}}, + ) + c.Redirect(http.StatusMovedPermanently, result.LongUrl) +} + +func DeleteExpiredUrls() { + collection := database.GetCollection(database.Client, os.Getenv("DB_COLLECTION")) + ctx, cancel := context.WithTimeout(context.TODO(), 10*time.Second) + defer cancel() + + cursor, err := collection.Find(ctx, bson.M{}) + if err != nil { + log.Fatal("Error in fetching documents ", err.Error()) + return + } + defer cursor.Close(ctx) + + currTime := time.Now().Unix() + for cursor.Next(ctx) { + var item models.Response + if err := cursor.Decode(&item); err != nil { + log.Fatal("Error in decoding document: ", err.Error()) + continue + } + if currTime > int64(item.ExpiresAt) { + _, err := collection.DeleteOne(ctx, bson.M{"_id": item.ID}) + if err != nil { + log.Printf("Error in deleting the url") + } else { + log.Printf("Succesfully deleted the url") + } + } + } + if err := cursor.Err(); err != nil { + log.Fatal("Error in iterating through cursor: ", err.Error()) + return + } + +} diff --git a/database/db.go b/database/db.go new file mode 100644 index 0000000..020304e --- /dev/null +++ b/database/db.go @@ -0,0 +1,40 @@ +package database + +import ( + "context" + "fmt" + "go.mongodb.org/mongo-driver/mongo" + "go.mongodb.org/mongo-driver/mongo/options" + "log" + "os" + "time" +) + +var Client *mongo.Client + +func ConnectDB() *mongo.Client { + var uri = os.Getenv("DB_HOST") + + clientOptions := options.Client().ApplyURI(fmt.Sprintf("mongodb://localhost:%s", uri)) + + ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + + client, err := mongo.Connect(ctx, clientOptions) + if err != nil { + log.Fatal(err) + } + + err = client.Ping(ctx, nil) + if err != nil { + log.Fatal("Could not connect to MongoDB: ", err) + } + + fmt.Printf("Connected to MongoDB") + Client = client + return client +} + +func GetCollection(client *mongo.Client, collectionName string) *mongo.Collection { + return client.Database("url-shortener").Collection(collectionName) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..4d71004 --- /dev/null +++ b/go.mod @@ -0,0 +1,47 @@ +module github.com/rimo02/url-shortener + +go 1.22.1 + +require ( + github.com/gin-gonic/gin v1.10.0 + github.com/joho/godotenv v1.5.1 + go.mongodb.org/mongo-driver v1.17.1 + golang.org/x/time v0.7.0 +) + +require ( + github.com/bytedance/sonic v1.11.6 // indirect + github.com/bytedance/sonic/loader v0.1.1 // indirect + github.com/cloudwego/base64x v0.1.4 // indirect + github.com/cloudwego/iasm v0.2.0 // indirect + github.com/gabriel-vasile/mimetype v1.4.3 // 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 v10.20.0 // indirect + github.com/goccy/go-json v0.10.2 // indirect + github.com/golang/snappy v0.0.4 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/klauspost/compress v1.13.6 // indirect + github.com/klauspost/cpuid/v2 v2.2.7 // indirect + github.com/leodido/go-urn v1.4.0 // indirect + github.com/mattn/go-isatty v0.0.20 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/montanaflynn/stats v0.7.1 // indirect + github.com/pelletier/go-toml/v2 v2.2.2 // indirect + github.com/twitchyliquid64/golang-asm v0.15.1 // indirect + github.com/ugorji/go/codec v1.2.12 // indirect + github.com/xdg-go/pbkdf2 v1.0.0 // indirect + github.com/xdg-go/scram v1.1.2 // indirect + github.com/xdg-go/stringprep v1.0.4 // indirect + github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect + golang.org/x/arch v0.8.0 // indirect + golang.org/x/crypto v0.26.0 // indirect + golang.org/x/net v0.25.0 // indirect + golang.org/x/sync v0.8.0 // indirect + golang.org/x/sys v0.23.0 // indirect + golang.org/x/text v0.17.0 // indirect + google.golang.org/protobuf v1.34.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..1d06135 --- /dev/null +++ b/go.sum @@ -0,0 +1,133 @@ +github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0= +github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4= +github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM= +github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU= +github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y= +github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w= +github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg= +github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod 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+func Shortener(n int) string { + collection := database.GetCollection(database.Client, os.Getenv("DB_COLLECTION")) + ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + b := make([]byte, n) + for { + for i := range b { + b[i] = letter[rand.Intn(len(letter))] + } + var result models.Response + err := collection.FindOne(ctx, bson.M{"surl": string(b)}).Decode(&result) + if err == mongo.ErrNoDocuments { + return string(b) + } else if err != nil { + log.Printf("A database error occured") + } else { + continue + } + } +} diff --git a/main.exe b/main.exe new file mode 100644 index 0000000..5d613d8 Binary files /dev/null and b/main.exe differ diff --git a/main.go b/main.go new file mode 100644 index 0000000..fb78103 --- /dev/null +++ b/main.go @@ -0,0 +1,36 @@ +package main + +import ( + "fmt" + "os" + "time" + + "github.com/gin-gonic/gin" + "github.com/joho/godotenv" + "github.com/rimo02/url-shortener/controller" + "github.com/rimo02/url-shortener/database" + "github.com/rimo02/url-shortener/routes" +) + +func StartExpiryCheck() { + ticker := time.NewTicker(1 * time.Second) + for range ticker.C { + controller.DeleteExpiredUrls() + } +} +func init() { + err := godotenv.Load() + if err != nil { + panic(err) + } + database.ConnectDB() +} +func main() { + r := gin.Default() + go StartExpiryCheck() + routes.RegisterRoutes(r) + err := r.Run(":" + os.Getenv("PORT")) + if err != nil { + fmt.Println("Error running at port ", os.Getenv("PORT"), " error = ", err.Error()) + } +} diff --git a/middleware/ratelimiter.go b/middleware/ratelimiter.go new file mode 100644 index 0000000..3ae623e --- /dev/null +++ b/middleware/ratelimiter.go @@ -0,0 +1,78 @@ +package middleware + +import ( + "net" + "net/http" + "sync" + "time" + + "github.com/gin-gonic/gin" + "golang.org/x/time/rate" +) + +const ( + rateLimit = 100.0 / 3600.0 // 100 requests for every client every 1 hour + burstLimit = 100 // maximum upto 100 requests a client can make at once + cleanUpInterval = time.Minute + idleTimeout = time.Hour +) + +type Client struct { + limiter *rate.Limiter + lastSeen time.Time +} + +type Message struct { + Status string `json:"status"` + Body string `json:"body"` +} + +var ( + mu sync.Mutex + clients = make(map[string]*Client) +) + +func getClientLimiter(ip string) *rate.Limiter { + mu.Lock() + defer mu.Unlock() + limiter, exist := clients[ip] + + if !exist { + limiter := rate.NewLimiter(rateLimit, burstLimit) + clients[ip] = &Client{ + limiter: limiter, + lastSeen: time.Now(), + } + } + return limiter.limiter +} + +func cleanUpOldclients() { + for { + time.Sleep(cleanUpInterval) + mu.Lock() + for ip, client := range clients { + if time.Since(client.lastSeen) > idleTimeout { + delete(clients, ip) + } + } + mu.Unlock() + } +} + +func PerClientRateLimiter() gin.HandlerFunc { + go cleanUpOldclients() + return func(c *gin.Context) { + ip, _, err := net.SplitHostPort(c.Request.RemoteAddr) + if err != nil { + c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"message": "unable to parse IP address"}) + return + } + limiter := getClientLimiter(ip) + if !limiter.Allow() { + c.AbortWithStatusJSON(http.StatusTooManyRequests, gin.H{"message": "Maximum Rate limit exceeded. Please try again after 1 hour"}) + return + } + c.Next() + } +} diff --git a/models/model.go b/models/model.go new file mode 100644 index 0000000..2fc139d --- /dev/null +++ b/models/model.go @@ -0,0 +1,18 @@ +package models + +import ( + "go.mongodb.org/mongo-driver/bson/primitive" +) + +type Request struct { + LongUrl string `json:"lurl"` +} + +type Response struct { + ID primitive.ObjectID `bson:"_id,omitempty"` + LongUrl string `bson:"lurl"` + ShortUrl string `bson:"surl"` + Hits int `bson:"hits"` + ExpiresAt int `bson:"expat"` + LastRequestTime int `bson:"lastreq"` +} diff --git a/routes/routes.go b/routes/routes.go new file mode 100644 index 0000000..4b9291a --- /dev/null +++ b/routes/routes.go @@ -0,0 +1,12 @@ +package routes + +import ( + "github.com/gin-gonic/gin" + "github.com/rimo02/url-shortener/controller" + "github.com/rimo02/url-shortener/middleware" +) + +var RegisterRoutes = func(c *gin.Engine) { + c.POST("/shorten", controller.ShortenTheUrl) + c.GET("/:shorturl", middleware.PerClientRateLimiter(), controller.GetTheUrl) +}