Update 'README.md'

5feet11.api

@@ -27,10 +27,22 @@ type (
 	}
 )
 
+type (
+	GetLinkResp {
+		ID        string `json:"id"`
+		LongUrl   string `json:"longUrl"`
+		CreatedAt string `json:"createdAt"`
+		Lifespan  int64  `json:"lifespan"`
+	}
+)
+
 service fivefeeteleven-api {
 	@handler ExpandUrl
 	get /:id(ExpandReq) returns(ExpandResp)
 	
 	@handler ShortenUrl
-	post /redirect(ShortenReq) returns(ShortenResp)
+	post /api/v1/links(ShortenReq) returns(ShortenResp)
+	
+	@handler GetLink
+	get /api/v1/links/:id(ExpandReq) returns(GetLinkResp)
 }

README.md

@@ -1,15 +1,39 @@
 # 5feet11
 
-A URL shortener that generates links even shorter than 5'11.
+A scalable URL shortener.
+
+## Prepare
+- ScyllaDB
+- Prometheus*
+
+*: Optional
+
+## Run
+Update the config at `etc/fivefeeteleven-api.yaml`.
+```sh
+# Docker
+docker run -it $(docker build -q .)
+
+# Compile
+make build && ./5feet11
+```
+
 
 ## Usage
 ```bash
 # Shorten a URL
-curl --header "Content-Type: application/json" \
-  --request POST \
-  --data '{"redirectUrl":"https://news.ycombinator.com"}' \
-  http://localhost:5111/redirect
+curl -X POST -H "Content-Type: application/json" \
+  -d '{"longUrl":"https://news.ycombinator.com"}' \
+  http://localhost:5111/api/v1/links
+
+# Shorten a URL that expires after N seconds
+curl -X POST -H "Content-Type: application/json" \
+  -d '{"longUrl":"https://news.ycombinator.com", "expiresAfter": 30}' \
+  http://localhost:5111/api/v1/links
 
 # Expand the URL
 curl -iL http://localhost:5111/{id}
+
+# Get information of a specific URL
+curl -iL http://localhost:5111/api/v1/links/{id}
 ```

fivefeeteleven.go

@@ -2,14 +2,17 @@ package main
 
 import (
 	"flag"
+	"net/http"
 
 	"5feet11/internal/config"
+	"5feet11/internal/errorx"
 	"5feet11/internal/handler"
 	"5feet11/internal/svc"
 
 	"github.com/zeromicro/go-zero/core/conf"
 	"github.com/zeromicro/go-zero/core/logx"
 	"github.com/zeromicro/go-zero/rest"
+	"github.com/zeromicro/go-zero/rest/httpx"
 )
 
 var configFile = flag.String("f", "etc/fivefeeteleven-api.yaml", "the config file")
@@ -26,6 +29,15 @@ func main() {
 	ctx := svc.NewServiceContext(c)
 	handler.RegisterHandlers(server, ctx)
 
+	httpx.SetErrorHandler(func(err error) (int, interface{}) {
+		switch e := err.(type) {
+		case *errorx.CodeError:
+			return http.StatusBadRequest, e.Data()
+		default:
+			return http.StatusInternalServerError, nil
+		}
+	})
+
 	logx.Infof("Starting server at http://%s:%d", c.Host, c.Port)
 	server.Start()
 }

internal/db/models.go

@@ -1,15 +1,21 @@
 package db
 
-import "github.com/scylladb/gocqlx/v2/table"
+import (
+	"time"
+
+	"github.com/scylladb/gocqlx/v2/table"
+)
 
 var UrlTable = table.New(table.Metadata{
 	Name:    "fivefeeteleven.urls",
-	Columns: []string{"id", "long_url"},
+	Columns: []string{"id", "long_url", "lifespan", "created_at"},
 	PartKey: []string{"id"},
 	SortKey: []string{},
 })
 
 type UrlModel struct {
-	ID      string
-	LongUrl string
+	ID        string
+	LongUrl   string
+	Lifespan  int64
+	CreatedAt time.Time
 }

internal/db/seed.go

@@ -15,7 +15,9 @@ func Seed(session gocqlx.Session) error {
 	err = session.ExecStmt(`
 		CREATE TABLE IF NOT EXISTS fivefeeteleven.urls (
 			id text PRIMARY KEY,
-			long_url text
+			long_url text,
+			created_at timestamp,
+			lifespan bigint
 		)`)
 
 	if err != nil {

internal/errorx/http.go

@@ -0,0 +1,32 @@
+package errorx
+
+const defaultCode = 1001
+
+type CodeError struct {
+	Code int    `json:"code"`
+	Msg  string `json:"msg"`
+}
+
+type CodeErrorResponse struct {
+	Code int    `json:"code"`
+	Msg  string `json:"msg"`
+}
+
+func NewCodeError(code int, msg string) error {
+	return &CodeError{Code: code, Msg: msg}
+}
+
+func NewDefaultError(msg string) error {
+	return NewCodeError(defaultCode, msg)
+}
+
+func (e *CodeError) Error() string {
+	return e.Msg
+}
+
+func (e *CodeError) Data() *CodeErrorResponse {
+	return &CodeErrorResponse{
+		Code: e.Code,
+		Msg:  e.Msg,
+	}
+}

internal/handler/getlinkhandler.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"net/http"
+
+	"5feet11/internal/logic"
+	"5feet11/internal/svc"
+	"5feet11/internal/types"
+	"github.com/zeromicro/go-zero/rest/httpx"
+)
+
+func GetLinkHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.ExpandReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.Error(w, err)
+			return
+		}
+
+		l := logic.NewGetLinkLogic(r.Context(), svcCtx)
+		resp, err := l.GetLink(&req)
+		if err != nil {
+			httpx.Error(w, err)
+		} else {
+			httpx.OkJson(w, resp)
+		}
+	}
+}

internal/handler/routes.go

@@ -19,9 +19,14 @@ func RegisterHandlers(server *rest.Server, serverCtx *svc.ServiceContext) {
 			},
 			{
 				Method:  http.MethodPost,
-				Path:    "/redirect",
+				Path:    "/api/v1/links",
 				Handler: ShortenUrlHandler(serverCtx),
 			},
+			{
+				Method:  http.MethodGet,
+				Path:    "/api/v1/links/:id",
+				Handler: GetLinkHandler(serverCtx),
+			},
 		},
 	)
 }

internal/logic/expandurllogic.go

@@ -2,9 +2,9 @@ package logic
 
 import (
 	"context"
-	"fmt"
 
 	"5feet11/internal/db"
+	"5feet11/internal/errorx"
 	"5feet11/internal/svc"
 	"5feet11/internal/types"
 
@@ -31,11 +31,11 @@ func (l *ExpandUrlLogic) ExpandUrl(req *types.ExpandReq) (resp *types.ExpandResp
 
 	var urls []db.UrlModel
 	if err := queryUrl.Select(&urls); err != nil {
-		return nil, err
+		return nil, errorx.NewDefaultError(err.Error())
 	}
 
 	if len(urls) != 1 {
-		return nil, fmt.Errorf("no URL found")
+		return nil, errorx.NewDefaultError("no URL found")
 	}
 
 	resp = &types.ExpandResp{

internal/logic/getlinklogic.go

@@ -0,0 +1,49 @@
+package logic
+
+import (
+	"context"
+
+	"5feet11/internal/db"
+	"5feet11/internal/errorx"
+	"5feet11/internal/svc"
+	"5feet11/internal/types"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type GetLinkLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewGetLinkLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetLinkLogic {
+	return &GetLinkLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *GetLinkLogic) GetLink(req *types.ExpandReq) (resp *types.GetLinkResp, err error) {
+	queryUrl := db.UrlTable.SelectQuery(l.svcCtx.DB)
+	queryUrl.BindStruct(db.UrlModel{ID: req.ID})
+
+	var urls []db.UrlModel
+	if err := queryUrl.Select(&urls); err != nil {
+		return nil, errorx.NewDefaultError(err.Error())
+	}
+
+	if len(urls) != 1 {
+		return nil, errorx.NewDefaultError("no URL found")
+	}
+
+	resp = &types.GetLinkResp{
+		ID:        urls[0].ID,
+		LongUrl:   urls[0].LongUrl,
+		CreatedAt: urls[0].CreatedAt.String(),
+		Lifespan:  urls[0].Lifespan,
+	}
+
+	return resp, err
+}

internal/logic/shortenurllogic.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"5feet11/internal/db"
+	"5feet11/internal/errorx"
 	"5feet11/internal/svc"
 	"5feet11/internal/types"
 
@@ -36,16 +37,19 @@ func (l *ShortenUrlLogic) ShortenUrl(req *types.ShortenReq) (resp *types.Shorten
 
 	insertUrl := insertBuilder.Query(l.svcCtx.DB)
 	insertUrl.BindStruct(db.UrlModel{
-		ID:      id,
-		LongUrl: req.LongUrl,
+		ID:        id,
+		LongUrl:   req.LongUrl,
+		Lifespan:  req.ExpiresAfter,
+		CreatedAt: time.Now(),
 	})
 
 	if err := insertUrl.ExecRelease(); err != nil {
-		return nil, err
+		return nil, errorx.NewDefaultError(err.Error())
 	}
 
 	resp = &types.ShortenResp{
 		ID: id,
 	}
+
 	return resp, nil
 }

internal/types/types.go

@@ -17,3 +17,10 @@ type ShortenReq struct {
 type ShortenResp struct {
 	ID string `json:"id"`
 }
+
+type GetLinkResp struct {
+	ID        string `json:"id"`
+	LongUrl   string `json:"longUrl"`
+	CreatedAt string `json:"createdAt"`
+	Lifespan  int64  `json:"lifespan"`
+}