Adding deletion for os and server

Database/os.go

@@ -84,14 +84,49 @@ func GetVersionsByDistributionList(db *sql.DB, d string) ([]null.String, error)
 	return list, nil
 }
 
+func checkIfOsExists(os OS, db *sql.DB) bool {
+	row := db.QueryRow("Select distribution, version from dashboard_os where distribution = ? and version = ?", os.Distribution, os.Version)
+	err := row.Scan(&os.Distribution, &os.Version)
+	if !errors.Is(err, sql.ErrNoRows) {
+		log.Println("OS exists")
+		return true
+	}
+	return false
+}
+
 func CreateOS(os OS, db *sql.DB) error {
+	if checkIfOsExists(os, db) {
+		log.Println("OS already exists")
+		return nil
+	}
 	q, err := db.Prepare("INSERT INTO `dashboard_os` (`distribution`,`version`,`end_of_support`) VALUES (?,?,?)")
 	if err != nil {
 		log.Println("Error creating query", err)
+		return err
 	}
 	_, err = q.Exec(&os.Distribution, &os.Version, &os.EndOfSupport)
 	if err != nil {
 		log.Println("Error inserting OS", err)
+		return err
 	}
-	return err
+	return nil
+}
+
+func DeleteOS(os OS, db *sql.DB) (int, error) {
+	if !checkIfOsExists(os, db) {
+		log.Println("OS does not exist, nothing to delete")
+		return 404, nil
+	}
+	q, err := db.Prepare("DELETE FROM dashboard_os WHERE distribution = ? AND version = ?")
+	if err != nil {
+		log.Println("Error deleting OS", err)
+		return 500, err
+	}
+	_, err = q.Exec(&os.Distribution, &os.Version)
+	if err != nil {
+		log.Println("Error deleting OS", err)
+		return 500, err
+	}
+	log.Println("OS deleted")
+	return 200, nil
 }

Database/server.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	"database/sql"
+	"errors"
 	"gopkg.in/guregu/null.v4"
 	"log"
 )
@@ -70,14 +71,49 @@ func GetServersbyOS(db *sql.DB, id int64) ([]Server, error) {
 	return servers, err
 }
 
+func checkIfServerExists(server Server, db *sql.DB) bool {
+	row := db.QueryRow("Select hostname, os_id from dashboard_server where hostname = ? and os_id = ?", server.Hostname, server.OsId)
+	err := row.Scan(&server.Hostname, &server.OsId)
+	if !errors.Is(err, sql.ErrNoRows) {
+		log.Println("Server exists")
+		return true
+	}
+	return false
+}
+
 func CreateServer(server Server, db *sql.DB) error {
+	if checkIfServerExists(server, db) {
+		log.Println("Server already exists")
+		return nil
+	}
 	q, err := db.Prepare("INSERT INTO `dashboard_server` (hostname, os_id) VALUES (?,?)")
 	if err != nil {
 		log.Println("Error creating query", err)
+		return err
 	}
 	_, err = q.Exec(server.Hostname, server.OsId)
 	if err != nil {
 		log.Println("Error inserting Server", err)
+		return err
 	}
-	return err
+	return nil
+}
+
+func DeleteServer(server Server, db *sql.DB) (int, error) {
+	if !checkIfServerExists(server, db) {
+		log.Println("Server does not exist, nothing to delete")
+		return 404, nil
+	}
+	q, err := db.Prepare("DELETE FROM dashboard_server WHERE hostname = ? AND os_id = ?")
+	if err != nil {
+		log.Println("Error deleting Server", err)
+		return 500, err
+	}
+	_, err = q.Exec(server.Hostname, server.OsId)
+	if err != nil {
+		log.Println("Error deleting Server", err)
+		return 500, err
+	}
+	log.Println("Server deleted")
+	return 200, nil
 }

Http/os.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	db "infra-dashboard/Database"
 	"io"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"strconv"
@@ -123,3 +124,28 @@ func CreateOS(w http.ResponseWriter, r *http.Request) {
 	logRequest(t, r, status)
 	w.WriteHeader(status)
 }
+
+func DeleteOS(w http.ResponseWriter, r *http.Request) {
+	var os db.OS
+	var err error
+	var status int
+	t := time.Now()
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		log.Println(err.Error(), "Error reading request body")
+	}
+
+	params := make(map[string]null.String)
+	json.Unmarshal(body, &params)
+	os.Distribution = params["distribution"]
+	os.Version = params["version"]
+	dbConn := db.GetDatabaseConnection()
+	defer dbConn.Close()
+	status, err = db.DeleteOS(os, dbConn)
+	if err != nil {
+		log.Println(err.Error(), "Error deleting OS")
+	}
+	logRequest(t, r, status)
+	w.WriteHeader(status)
+}

Http/server.go

@@ -104,3 +104,28 @@ func CreateServer(w http.ResponseWriter, r *http.Request) {
 	logRequest(t, r, status)
 	w.WriteHeader(status)
 }
+
+func DeleteServer(w http.ResponseWriter, r *http.Request) {
+	var server db.Server
+	var err error
+	var status int
+	t := time.Now()
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		log.Println(err.Error(), "Error reading request body")
+	}
+
+	params := make(map[string]null.String)
+	json.Unmarshal(body, &params)
+	server.Hostname = params["hostname"]
+	server.OsId = params["os_id"]
+	dbConn := db.GetDatabaseConnection()
+	defer dbConn.Close()
+	status, err = db.DeleteServer(server, dbConn)
+	if err != nil {
+		log.Println(err.Error(), "Error deleting server")
+	}
+	logRequest(t, r, status)
+	w.WriteHeader(status)
+}

main.go

@@ -34,11 +34,13 @@ func main() {
 	router.HandleFunc("/os/create", h.CreateOS).Methods("POST")
 	router.HandleFunc("/os/distribution", h.GetDistributionList).Methods("GET")
 	router.HandleFunc("/os/distribution/{distribution:[a-zA-Z]+}/versions", h.GetVersionsByDistributionList).Methods("GET")
+	router.HandleFunc("/os/delete", h.DeleteOS).Methods("DELETE")
 
 	router.HandleFunc("/servers", h.GetServersList).Methods("GET")
 	router.HandleFunc("/server/{id:[0-9]+}", h.GetServersbyID).Methods("GET")
 	router.HandleFunc("/server/os/{os_id:[0-9]+}", h.GetServersbyOS).Methods("GET")
 	router.HandleFunc("/server/create", h.CreateServer).Methods("POST")
+	router.HandleFunc("/server/delete", h.DeleteServer).Methods("DELETE")
 
 	router.HandleFunc("/packages", h.GetAllPackages).Methods("GET")
 	router.HandleFunc("/packages/{id:[0-9]+}", h.GetPackagebyID).Methods("GET")