All methods implemented

README.md

@@ -1,13 +1,17 @@
 # CRUD api
 ## A simple CRUD api written in Go
 
-API has implementation of "GET", "POST", "PUT", "DELETE" http methods, allowing to Create, Read, Update and Delete objects in database via json input.
+API has implementation of "GET", "POST", "PATCH", "DELETE" http methods, allowing to Create, Read, Update and Delete objects in sqlite3 database via json input.
 
 ---
 
 ## Status
 
-Can POST a new RandomData, GET all or a specific one. 
+Implemented:
+- **GET**
+- **POST**
+- **PATCH**
+- **DELETE**
 
 ---
 

curl_examples

@@ -1,6 +1,6 @@
 curl localhost:8000/randomdata
 curl localhost:8000/randomdata -H "content-type:application/json" -d '{"title":"This is a title","text":"This is a text"}' -X POST 
-curl localhost:8000/randomdata/1618064651615612586 -H "content-type:application/json" -d {"title":"This is an updated title","text":"This is an updated text"}' -X PUT 
+curl localhost:8000/randomdata/1 -H "content-type:application/json" -d {"title":"This is an updated title","text":"This is an updated text"}' -X PUT 
-curl localhost:8000/randomdata/1618065099475731301
+curl localhost:8000/randomdata/1
-curl localhost:8000/randomdata/1618065099475731301  -X DELETE
+curl localhost:8000/randomdata/1  -X DELETE
 

dbHandle/handle.go

@@ -14,6 +14,33 @@ import (
 	_ "github.com/mattn/go-sqlite3"
 )
 
+// Check if a row with given id exists
+func (db *DB) Exists(id uint) (bool, error) {
+	row, err := db.Query(fmt.Sprintf("SELECT * FROM %s WHERE id=%d", tableName, id))
+	if err != nil {
+		return false, err
+	}
+
+	// there should be only one row, because we search with id
+	for row.Next() {
+		var realID uint
+		var title string
+		var text string
+		var dateCreated int64
+		var lastUpdated int64
+
+		row.Scan(&realID, &title, &text, &dateCreated, &lastUpdated)
+
+		fmt.Printf("real %d --- given %d\n", realID, id)
+
+		if realID == id {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
 // Collect and return all rows in db
 func (db *DB) GetEverything() ([]*randomdata.RandomData, error) {
 	rows, err := db.Query(fmt.Sprintf("SELECT * FROM %s", tableName))
@@ -78,11 +105,23 @@ func (db *DB) GetSpecific(id uint) (*randomdata.RandomData, error) {
 
 // Delete `RandomData` from db with given id
 func (db *DB) DeleteSpecific(id uint) error {
+	_, err := db.Exec(fmt.Sprintf("DELETE FROM %s WHERE id=%d", tableName, id))
+	if err != nil {
+		return err
+	}
+
 	return nil
 }
 
-// Edit `Randomdata` from db with given id
+// Replace `Randomdata` in db with given id with a new one.
-func (db *DB) PatchSpecific(id uint) error {
+// Does not affect `DateCreated`
+func (db *DB) UpdateSpecific(id uint, newRD randomdata.RandomData) error {
+	// `DateCreated` won`t be changed because we`re patching an already existing thing
+	_, err := db.Exec(fmt.Sprintf("UPDATE %s SET title='%s', text='%s', last_updated=%d WHERE id=%d", tableName, newRD.Title, newRD.Text, newRD.LastUpdated, id))
+	if err != nil {
+		return err
+	}
+
 	return nil
 }
 
@@ -130,7 +169,6 @@ func (db *DB) HandleGlobalWeb(w http.ResponseWriter, r *http.Request) {
 			log.Printf("Could not create a row: %s", err)
 		}
 		w.WriteHeader(http.StatusAccepted)
-		return
 
 	case http.MethodGet:
 		randomDatas, err := db.GetEverything()
@@ -147,11 +185,9 @@ func (db *DB) HandleGlobalWeb(w http.ResponseWriter, r *http.Request) {
 		}
 
 		w.Write(randomDatasJsonBytes)
-		return
 
 	default:
 		w.WriteHeader(http.StatusMethodNotAllowed)
-		return
 	}
 
 }
@@ -180,14 +216,54 @@ func (db *DB) HandleSpecificWeb(w http.ResponseWriter, r *http.Request) {
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			log.Printf("Could not convert RandomData to Json: %s\n", err)
+			return
 		}
 
 		w.Write(rdJsonBytes)
-		return
+
+	case http.MethodDelete:
+		err := db.DeleteSpecific(uint(providedID))
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			log.Printf("Could not delete from db: %s\n", err)
+			return
+		}
+
+	case http.MethodPatch:
+		if r.Header.Get("content-type") != "application/json" {
+			w.WriteHeader(http.StatusUnsupportedMediaType)
+			return
+		}
+
+		defer r.Body.Close()
+
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		var randomData randomdata.RandomData
+		err = json.Unmarshal(body, &randomData)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		// create date created, last updated
+		randomData.LastUpdated = time.Now().UTC().Unix()
+
+		err = db.UpdateSpecific(uint(providedID), randomData)
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			log.Printf("Could not update a RandomData: %s\n", err)
+			return
+		}
+
+		w.WriteHeader(http.StatusAccepted)
 
 	default:
 		w.WriteHeader(http.StatusMethodNotAllowed)
-		return
 	}
 
 }

main.go

@@ -14,7 +14,7 @@ import (
 var (
 	port      *uint  = flag.Uint("port", 8080, "Specifies a port on which the helping page will be served")
 	dbname    string = "database.db"
-	tableName        = "randomdata"
+	tableName string = "randomdata"
 )
 
 func init() {
@@ -35,6 +35,7 @@ func main() {
 	}
 	log.Printf("Created %s db\n", tableName)
 
+	// set up patterns and handlers
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", helpPage)
 	mux.HandleFunc("/randomdata", db.HandleGlobalWeb)
@@ -65,106 +66,3 @@ func helpPage(w http.ResponseWriter, r *http.Request) {
 	`
 	fmt.Fprint(w, helpMessage)
 }
-
-// func (dbHandler *randomDataHandler) updateSpecificRandomData(w http.ResponseWriter, r *http.Request) {
-// 	if r.Header.Get("content-type") != "application/json" {
-// 		w.WriteHeader(http.StatusUnsupportedMediaType)
-// 		w.Write([]byte(fmt.Sprintf("Got `%s` instead of `application/json`", r.Header.Get("content-type"))))
-// 		return
-// 	}
-
-// 	requestBody, err := io.ReadAll(r.Body)
-// 	if err != nil {
-// 		log.Println("Error reading http request (create) : ", err)
-// 		w.WriteHeader(http.StatusBadRequest)
-// 		r.Body.Close()
-// 		return
-// 	}
-// 	defer r.Body.Close()
-
-// 	var givenUpdatedRandomData RandomData
-// 	err = json.Unmarshal(requestBody, &givenUpdatedRandomData)
-// 	if err != nil {
-// 		log.Println("Error unmarshalling request body (updateSpecificRandomData) : ", err)
-// 		return
-// 	}
-
-// 	givenID := strings.Split(r.URL.String(), "/")[2]
-
-// 	dbBytes, err := dbHandler.readDatabase()
-// 	if err != nil {
-// 		log.Println("Error reading db (updateSpecificRandomData) : ", err)
-// 		w.WriteHeader(http.StatusInternalServerError)
-// 		return
-// 	}
-// 	var db []RandomData
-
-// 	err = json.Unmarshal(dbBytes, &db)
-// 	if err != nil {
-// 		log.Println("Error unmarshalling database (update) : ", err)
-// 		return
-// 	}
-
-// 	int64GivenID, _ := strconv.ParseInt(givenID, 10, 64)
-// 	var counter int64
-// 	for _, randomData := range db {
-// 		if int64GivenID == randomData.ID {
-// 			var updatedRandomData RandomData
-
-// 			updatedRandomData = givenUpdatedRandomData
-// 			updatedRandomData.ID = randomData.ID
-// 			updatedRandomData.DateCreated = randomData.DateCreated
-// 			updatedRandomData.LastUpdated = time.Now().UTC()
-
-// 			dbHandler.removeRandomData(int64GivenID)
-// 			dbHandler.writeRandomData(updatedRandomData)
-
-// 			log.Printf("Successfully updated RandomData with id %v \n", updatedRandomData.ID)
-// 			return
-// 		}
-// 		counter++
-// 	}
-
-// 	w.WriteHeader(http.StatusNotFound)
-// }
-
-// func (dbHandler *randomDataHandler) deleteSpecificRandomData(w http.ResponseWriter, r *http.Request) {
-// 	givenID := strings.Split(r.URL.String(), "/")[2]
-
-// 	int64GivenID, _ := strconv.ParseInt(givenID, 10, 64)
-
-// 	err := dbHandler.removeRandomData(int64GivenID)
-// 	if err != nil {
-// 		log.Println("Error removing RandomData (deleteSpecificRandomData) : ", err)
-// 		w.WriteHeader(http.StatusInternalServerError)
-// 		return
-// 	}
-
-// 	w.WriteHeader(http.StatusOK)
-
-// 	log.Printf("Successfully deleted RandomData with id %v \n", int64GivenID)
-// }
-
-// func (dbHandler *randomDataHandler) handle(w http.ResponseWriter, r *http.Request) {
-// 	switch r.Method {
-// 	case "GET":
-// 		dbHandler.get(w, r)
-// 	case "POST":
-// 		dbHandler.create(w, r)
-// 	default:
-// 		w.WriteHeader(http.StatusMethodNotAllowed)
-// 	}
-// }
-
-// func (dbHandler *randomDataHandler) handleSpecific(w http.ResponseWriter, r *http.Request) {
-// 	switch r.Method {
-// 	case "GET":
-// 		dbHandler.getSpecificRandomData(w, r)
-// 	case "PUT":
-// 		dbHandler.updateSpecificRandomData(w, r)
-// 	case "DELETE":
-// 		dbHandler.deleteSpecificRandomData(w, r)
-// 	default:
-// 		w.WriteHeader(http.StatusMethodNotAllowed)
-// 	}
-// }