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package main
import "fmt"
import "io"
import "io/ioutil"
import "net/http"
import "os"
import "strconv"
import _ "github.com/lib/pq"
import "database/sql"
import "encoding/json"
type APIError struct {
Code int
Msg string
}
type APIDataIds struct {
Ids interface{}
}
type APIDataRecipe struct {
Recipe interface{}
}
type APIResponseList struct {
Status APIError
Data []APIDataIds
}
type APIResponseItem struct {
Status APIError
Data []APIDataRecipe
}
func RecipeList(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
var ids []int
var id int
rows, err := db.Query("SELECT id FROM recipes")
if err != nil {
} else {
for rows.Next() {
rows.Scan(&id)
ids = append(ids, id)
}
}
resp := APIResponseList{
Status: APIError{Code: 200, Msg: "Successful Request"},
Data: make([]APIDataIds, 0),
}
resp.Data = append(resp.Data, APIDataIds{Ids: ids})
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
} else if r.Method == "POST" {
var recipe *Recipe
body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1048576))
if err != nil {
panic(err)
}
err = r.Body.Close()
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &recipe)
if err != nil {
w.WriteHeader(http.StatusUnprocessableEntity)
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
resp := APIResponseItem{
Status: APIError{
Code: http.StatusUnprocessableEntity,
Msg: "Invalid Recipe"},
Data: make([]APIDataRecipe, 0),
}
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
return
}
err = AddRecipeDB(recipe, db)
if err != nil {
resp := APIResponseItem{
Status: APIError{Code: http.StatusBadRequest,
Msg: "Recipe could not be added"},
Data: make([]APIDataRecipe, 0),
}
resp.Data = append(resp.Data, APIDataRecipe{recipe})
w.Header().Set("Content-Type",
"application/json; charset=UTF-8")
w.WriteHeader(http.StatusBadRequest)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
return
}
resp := APIResponseItem{
Status: APIError{Code: http.StatusCreated,
Msg: "Recipe added successfully"},
Data: make([]APIDataRecipe, 0),
}
resp.Data = append(resp.Data, APIDataRecipe{recipe})
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusCreated)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
}
//TODO add generic error response
}
func SingleRecipe(w http.ResponseWriter, r *http.Request) {
recipe_id, err := strconv.Atoi(r.URL.Path[len("/recipes/"):])
if err != nil {
fmt.Println("Not a valid ID")
return
}
if r.Method == "GET" {
var status int
var msg string
recipe := RecipeFromId(recipe_id, db)
if recipe == nil {
status = http.StatusNotFound
msg = "Recipe not Found"
} else {
status = http.StatusOK
msg = "Successful"
}
resp := APIResponseItem{
Status: APIError{Code: status, Msg: msg},
Data: make([]APIDataRecipe, 0),
}
if status == http.StatusOK {
resp.Data = append(resp.Data, APIDataRecipe{recipe})
}
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
} else if r.Method == "POST" {
fmt.Printf("Create recipe \"%d\"...\n", recipe_id)
//TODO add error msg response
} else if r.Method == "PUT" {
//TODO add Update Recipe
fmt.Printf("Update recipe \"%d\"...\n", recipe_id)
} else if r.Method == "DELETE" {
res, err := db.Exec(`DELETE FROM recipes where id = $1`,
recipe_id)
if err != nil {
panic(err)
}
var status int
var msg string
if res.RowsAffected() == 0 {
status = http.StatusNotFound
msg = "Recipe Not found"
} else {
status = http.StatusOK
msg = "Recipe Deleted Successfully"
}
resp := APIResponseItem{
Status: APIError{Code: status, Msg: msg},
Data: make([]APIDataRecipe, 0),
}
w.Header().Set("Content-Type",
"application/json; charset=UTF-8")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
panic(err)
}
}
//TODO add generic error response
}
var DB_PASSWORD string
var DB_USER string
var db *sql.DB
const DB_NAME = "recipe_buddy"
func init() {
DB_PASSWORD = os.Getenv("DATABASE_PASSWORD")
DB_USER = os.Getenv("DATABASE_USER")
}
func main() {
var err error
dbinfo := fmt.Sprintf("user=%s password=%s dbname=%s sslmode=disable",
DB_USER, DB_PASSWORD, DB_NAME)
db, err = sql.Open("postgres", dbinfo)
if err != nil || db.Ping() != nil {
fmt.Println("Error connecting to database")
}
http.HandleFunc("/recipes", RecipeList)
http.HandleFunc("/recipes/", SingleRecipe)
http.ListenAndServe(":8888", nil)
}
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