From bb358df4d5e17d082f41059151dee49eebe92911 Mon Sep 17 00:00:00 2001 From: keedosn Date: Fri, 4 Mar 2022 19:22:31 +0100 Subject: [PATCH] Initial code - bare-bone endpoints for creating simple objects --- .env.dist | 2 + .gitignore | 3 + Makefile | 20 +++ README.md | 3 + cmd/server/main.go | 59 +++++++ go.mod | 24 +++ go.sum | 229 +++++++++++++++++++++++++++ internal/app/database/connect.go | 16 ++ internal/app/entity/article.go | 15 ++ internal/app/entity/category.go | 12 ++ internal/app/handler/article.go | 48 ++++++ internal/app/handler/category.go | 41 +++++ internal/app/handler/error.go | 21 +++ internal/app/handler/handler.go | 74 +++++++++ internal/app/handler/health_check.go | 36 +++++ internal/app/router.go | 28 ++++ internal/app/server.go | 85 ++++++++++ modd.conf | 4 + 18 files changed, 720 insertions(+) create mode 100644 .env.dist create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 README.md create mode 100644 cmd/server/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 internal/app/database/connect.go create mode 100644 internal/app/entity/article.go create mode 100644 internal/app/entity/category.go create mode 100644 internal/app/handler/article.go create mode 100644 internal/app/handler/category.go create mode 100644 internal/app/handler/error.go create mode 100644 internal/app/handler/handler.go create mode 100644 internal/app/handler/health_check.go create mode 100644 internal/app/router.go create mode 100644 internal/app/server.go create mode 100644 modd.conf diff --git a/.env.dist b/.env.dist new file mode 100644 index 0000000..f67fe51 --- /dev/null +++ b/.env.dist @@ -0,0 +1,2 @@ +HTTP_PORT=8000 +DATABASE_URL=postgres://username:password@host:port/db_name diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..199c085 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +/.idea +.env +/vendor diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..217808f --- /dev/null +++ b/Makefile @@ -0,0 +1,20 @@ +run: + go run cmd/server/main.go + +race: + go run --race cmd/server/main.go + +build: + go build cmd/server/main.go + +test: + go test cmd/server/main.go + +# run-profiler: +# go run cmd/server/main.go -cpuprofile cpu.prof -memprofile mem.prof +# +# profile-cpu-web: +# go tool pprof -http=127.0.0.1:9990 cpu.prof +# +# profile-mem-web: +# go tool pprof -http=127.0.0.1:9991 mem.prof diff --git a/README.md b/README.md new file mode 100644 index 0000000..e9e24ca --- /dev/null +++ b/README.md @@ -0,0 +1,3 @@ +# rest-api-prototype + +My simple Golang REST API prototype. diff --git a/cmd/server/main.go b/cmd/server/main.go new file mode 100644 index 0000000..73b5a92 --- /dev/null +++ b/cmd/server/main.go @@ -0,0 +1,59 @@ +package main + +import ( + "context" + "log" + "net" + "os" + "os/signal" + "time" + + "git.pbiernat.dev/golang/rest-api-prototype/internal/app" + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/database" + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/handler" + "github.com/joho/godotenv" +) + +const ( // FIXME + defaultHTTPPort = "8080" + defaultDatabaseUrl = "postgres://postgres:12345678@127.0.0.1:5434/S7" +) + +func main() { + err := godotenv.Load(".env") + if err != nil { + log.Fatalln("Error loading .env file") + } + + httpAddr := net.JoinHostPort("127.0.0.1", getEnv("HTTP_PORT", defaultHTTPPort)) + dbConnStr := getEnv("DATABASE_URL", defaultDatabaseUrl) + + dbc, err := database.Connect(dbConnStr) + if err != nil { + log.Panicf("Unable to connect to database: %v\n", err) + } + + env := &handler.Env{httpAddr, dbc} + srv := app.NewServer(env) + + go srv.Start() + + c := make(chan os.Signal, 1) + signal.Notify(c, os.Interrupt) + <-c + + ctx, cancel := context.WithTimeout(context.Background(), time.Second*10) + defer cancel() + + srv.Shutdown(ctx) + os.Exit(0) +} + +func getEnv(name, defVal string) string { + env := os.Getenv(name) + if env == "" { + return defVal + } + + return env +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..fa0d780 --- /dev/null +++ b/go.mod @@ -0,0 +1,24 @@ +module git.pbiernat.dev/golang/rest-api-prototype + +go 1.17 + +require ( + github.com/georgysavva/scany v0.3.0 + github.com/gorilla/mux v1.8.0 + github.com/jackc/pgx/v4 v4.15.0 + github.com/joho/godotenv v1.4.0 +) + +require ( + github.com/jackc/chunkreader/v2 v2.0.1 // indirect + github.com/jackc/pgconn v1.11.0 // indirect + github.com/jackc/pgio v1.0.0 // indirect + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgproto3/v2 v2.2.0 // indirect + github.com/jackc/pgservicefile v0.0.0-20200714003250-2b9c44734f2b // indirect + github.com/jackc/pgtype v1.10.0 // indirect + github.com/jackc/puddle v1.2.1 // indirect + github.com/pkg/errors v0.9.1 // indirect + golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect + golang.org/x/text v0.3.6 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..9f92291 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h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gorm.io/driver/postgres v1.0.8/go.mod h1:4eOzrI1MUfm6ObJU/UcmbXyiHSs8jSwH95G5P5dxcAg= +gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= +gorm.io/gorm v1.21.4/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= diff --git a/internal/app/database/connect.go b/internal/app/database/connect.go new file mode 100644 index 0000000..b44cfdd --- /dev/null +++ b/internal/app/database/connect.go @@ -0,0 +1,16 @@ +package database + +import ( + "context" + + "github.com/jackc/pgx/v4/pgxpool" +) + +func Connect(connStr string) (*pgxpool.Pool, error) { + conn, err := pgxpool.Connect(context.Background(), connStr) + if err != nil { + return nil, err + } + + return conn, nil +} diff --git a/internal/app/entity/article.go b/internal/app/entity/article.go new file mode 100644 index 0000000..dbc3089 --- /dev/null +++ b/internal/app/entity/article.go @@ -0,0 +1,15 @@ +package entity + +import ( + "time" +) + +type Article struct { + ID int `json:"id"` + CategoryID int `json:"category_id"` + Title string `json:"title"` + Intro string `json:"intro"` + Text string `json:"text"` + CreateDate time.Time `json:"create_date"` + ModifyDate time.Time `json:"modify_date"` +} diff --git a/internal/app/entity/category.go b/internal/app/entity/category.go new file mode 100644 index 0000000..124ce7e --- /dev/null +++ b/internal/app/entity/category.go @@ -0,0 +1,12 @@ +package entity + +import ( + "time" +) + +type Category struct { + ID int + Name string + CreateDate time.Time + ModifyDate time.Time +} diff --git a/internal/app/handler/article.go b/internal/app/handler/article.go new file mode 100644 index 0000000..fb8be22 --- /dev/null +++ b/internal/app/handler/article.go @@ -0,0 +1,48 @@ +package handler + +import ( + "net/http" + "time" + + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/entity" +) + +var CreateArticleHandler *Handler + +func init() { + CreateArticleHandler = &Handler{ + Handle: CreateArticleHandlerFunc, + Request: &CreateArticleRequest{}, + Response: &CreateArticleResponse{}, + } +} + +type CreateArticleRequest struct { + CategoryID int `json:"category_id"` + Title string `json:"title"` + Intro string `json:"intro"` + Text string `json:"text"` +} + +type CreateArticleResponse struct { + Status string `json:"status"` + Data *entity.Article `json:"data"` + Err string `json:"err,omitempty"` +} + +func CreateArticleHandlerFunc(env *Env, req interface{}, w http.ResponseWriter) (interface{}, error) { + // var art = req.(*CreateArticleRequest) + // doSthWith(art) + + return &CreateArticleResponse{ + Status: http.StatusText(http.StatusOK), + Data: &entity.Article{ + ID: 1, + CategoryID: 1, + Title: "Dummy article", + Intro: "Intro", + Text: "Text", + CreateDate: time.Now(), + }, + }, nil +} diff --git a/internal/app/handler/category.go b/internal/app/handler/category.go new file mode 100644 index 0000000..f0519f5 --- /dev/null +++ b/internal/app/handler/category.go @@ -0,0 +1,41 @@ +package handler + +import ( + "net/http" + "time" + + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/entity" +) + +var CreateCategoryHandler *Handler + +func init() { + CreateCategoryHandler = &Handler{ + Handle: CreateCategoryHandlerFunc, + Request: &CreateCategoryRequest{}, + Response: &CreateCategoryResponse{}, + } +} + +type CreateCategoryRequest struct { + Name string `json:"name"` +} + +type CreateCategoryResponse struct { + Status string `json:"status"` + Data *entity.Category `json:"data"` + Err string `json:"err,omitempty"` +} + +func CreateCategoryHandlerFunc(env *Env, req interface{}, w http.ResponseWriter) (interface{}, error) { + // var cat = req.(*CreateCategoryRequest) + // doSthWith(cat) + + return &CreateCategoryResponse{ + Status: http.StatusText(http.StatusOK), + Data: &entity.Category{ + Name: "Dummy category", + CreateDate: time.Now(), + }, + }, nil +} diff --git a/internal/app/handler/error.go b/internal/app/handler/error.go new file mode 100644 index 0000000..8b8d8bf --- /dev/null +++ b/internal/app/handler/error.go @@ -0,0 +1,21 @@ +package handler + +import "net/http" + +type ErrorResponse struct { + Message string `json:"message"` +} + +type NotFoundHandler struct{} + +func (NotFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusNotFound) + encodeResponse(w, &ErrorResponse{Message: "Path " + r.RequestURI + " not found"}, nil) +} + +type MethodNotAllowedHandler struct{} + +func (MethodNotAllowedHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusMethodNotAllowed) + encodeResponse(w, &ErrorResponse{Message: "Method Not Allowed: " + r.Method}, nil) +} diff --git a/internal/app/handler/handler.go b/internal/app/handler/handler.go new file mode 100644 index 0000000..8a376f2 --- /dev/null +++ b/internal/app/handler/handler.go @@ -0,0 +1,74 @@ +package handler + +import ( + "bytes" + "encoding/json" + "io/ioutil" + "log" + "net/http" + + "github.com/jackc/pgx/v4/pgxpool" +) + +type Env struct { + Addr string + DB *pgxpool.Pool +} + +type HandlerFunc func(e *Env, req interface{}, w http.ResponseWriter) (interface{}, error) + +type Handler struct { + *Env + Handle HandlerFunc + Request interface{} + Response interface{} +} + +func New(env *Env, h *Handler) *Handler { + return &Handler{env, h.Handle, h.Request, h.Response} +} + +func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + if err := decodeRequestData(r, &h.Request); err != nil { + log.Println(err.Error()) + } + + res, err := h.Handle(h.Env, h.Request, w) + + encodeResponse(w, res, err) +} + +func decodeRequestData(r *http.Request, v interface{}) error { + buf, _ := ioutil.ReadAll(r.Body) + rdr := ioutil.NopCloser(bytes.NewReader(buf)) + r.Body = ioutil.NopCloser(bytes.NewReader(buf)) + + if len(buf) == 0 { + // log.Println("empty request body1") //FIXME #1 + + return nil + } + + if err := json.NewDecoder(rdr).Decode(&v); err != nil { + return err + } + + return nil +} + +func encodeResponse(w http.ResponseWriter, res interface{}, err error) { + if err != nil { + encodeError(w, err) + return + } + + json.NewEncoder(w).Encode(res) +} + +func encodeError(w http.ResponseWriter, e error) { + w.WriteHeader(http.StatusInternalServerError) + + json.NewEncoder(w).Encode(map[string]interface{}{ + "error": e.Error(), + }) +} diff --git a/internal/app/handler/health_check.go b/internal/app/handler/health_check.go new file mode 100644 index 0000000..874c167 --- /dev/null +++ b/internal/app/handler/health_check.go @@ -0,0 +1,36 @@ +package handler + +import ( + "net/http" +) + +var HealthCheckHandler *Handler + +func init() { + HealthCheckHandler = &Handler{ + Handle: HealthCheckHandlerFunc, + Request: &HealthCheckRequest{}, + Response: &HealthCheckResponse{}, + } +} + +type HealthCheckRequest struct { +} + +type HealthCheckResponse struct { + Status string `json:"status"` + Data *HealthCheckResponseBody `json:"data"` +} + +type HealthCheckResponseBody struct { + Message string `json:"message,omitempty"` +} + +func HealthCheckHandlerFunc(_ *Env, _ interface{}, w http.ResponseWriter) (interface{}, error) { + return &HealthCheckResponse{ + Status: http.StatusText(http.StatusOK), + Data: &HealthCheckResponseBody{ + Message: "This is welcome health message. Everything seems to be alright ;)", + }, + }, nil +} diff --git a/internal/app/router.go b/internal/app/router.go new file mode 100644 index 0000000..8c4fa6c --- /dev/null +++ b/internal/app/router.go @@ -0,0 +1,28 @@ +package app + +import ( + "net/http" + + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/handler" + "github.com/gorilla/mux" +) + +func SetupRouter(env *handler.Env) *mux.Router { + r := mux.NewRouter() + r.NotFoundHandler = &handler.NotFoundHandler{} + r.MethodNotAllowedHandler = &handler.MethodNotAllowedHandler{} + + r.Use(PrepareHeadersMiddleware) + r.Use(ValidateJsonBodyMiddleware) // probably not needed + r.Use(LoggingMiddleware) + + hc := r.PathPrefix("/health").Subrouter() + hc.Handle("", handler.New(env, handler.HealthCheckHandler)).Methods(http.MethodGet) + + api := r.PathPrefix("/api").Subrouter() + api.Handle("/article", handler.New(env, handler.CreateArticleHandler)).Methods(http.MethodPost) + + api.Handle("/category", handler.New(env, handler.CreateCategoryHandler)).Methods(http.MethodPost) + + return r +} diff --git a/internal/app/server.go b/internal/app/server.go new file mode 100644 index 0000000..f551e7e --- /dev/null +++ b/internal/app/server.go @@ -0,0 +1,85 @@ +package app + +import ( + "bytes" + "encoding/json" + "io/ioutil" + "log" + "net/http" + "time" + + "git.pbiernat.dev/golang/rest-api-prototype/internal/app/handler" +) + +type Server struct { + *http.Server +} + +func NewServer(env *handler.Env) *Server { + return &Server{ + &http.Server{ + Handler: SetupRouter(env), + Addr: env.Addr, + WriteTimeout: 15 * time.Second, + ReadTimeout: 15 * time.Second, + IdleTimeout: 60 * time.Second, + }, + } +} + +func (s *Server) Start() { + log.Println("Server listening on " + s.Addr) + if err := s.ListenAndServe(); err != nil { + log.Println(err) + } +} + +func (s *Server) ExecuteHandler() {} + +// func (s *Server) Shutdown(ctx context.Context) { +// log.Println("Shutting down...") + +// if err := s.Shutdown(ctx); err != nil { +// log.Panicln(err) +// } +// } + +func PrepareHeadersMiddleware(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.Header().Set("Content-Type", "application/json; charset=utf-8") + w.Header().Set("Connection", "keep-alive") + w.Header().Set("Keep-Alive", "timeout=5") + + next.ServeHTTP(w, r) + }) +} + +func ValidateJsonBodyMiddleware(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + buf, _ := ioutil.ReadAll(r.Body) + r.Body = ioutil.NopCloser(bytes.NewReader(buf)) // rollack *Request to original state + + if len(buf) == 0 { + // log.Println("empty request body2") // FIXME #1 + next.ServeHTTP(w, r) + + return + } + + if !json.Valid(buf) { + log.Println("Unable to parse JSON: ", string(buf)) + w.WriteHeader(http.StatusInternalServerError) + + return + } + + next.ServeHTTP(w, r) + }) +} + +func LoggingMiddleware(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + log.Println("Request: " + r.RequestURI + " remote: " + r.RemoteAddr + " via: " + r.UserAgent()) + next.ServeHTTP(w, r) + }) +} diff --git a/modd.conf b/modd.conf new file mode 100644 index 0000000..ce34a65 --- /dev/null +++ b/modd.conf @@ -0,0 +1,4 @@ +# Exclude all test files of the form *_test.go +**/*.go !**/*_test.go { + daemon +sigterm: make run +}