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restaurant-search/server.go

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/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
import (
"database/sql"
"encoding/json"
_ "github.com/go-sql-driver/mysql"
"log"
"net/http"
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"os"
"path/filepath"
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"strings"
)
var db *sql.DB
func executeQuery(rw http.ResponseWriter, req *http.Request) {
}
func getCategories(rw http.ResponseWriter, req *http.Request) {
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type Category struct {
Description string `json:"description"`
Id int `json:"id"`
}
rows, err := db.Query("SELECT * FROM categories")
if err != nil {
log.Fatal(err)
}
defer rows.Close()
var categories []Category
for rows.Next() {
var (
description string
id int
)
if err := rows.Scan(&description, &id); err != nil {
log.Fatal(err)
}
categories = append(categories, Category{description, id})
}
if err := rows.Err(); err != nil {
log.Fatal(err)
}
js, err := json.Marshal(categories)
if err != nil {
log.Fatal(err)
}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func addCategory(rw http.ResponseWriter, req *http.Request) {
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type Request struct {
Description string `json:"description"`
}
type Response struct {
Description string `json:"description"`
Id int `json:"id"`
Success bool `json:"success"`
}
var request Request
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
response := Response{Description: strings.TrimSpace(request.Description)}
if len(request.Description) > 0 {
result, err := db.Exec("INSERT INTO categories(description) VALUES(?)", request.Description)
if err != nil {
log.Fatal(err)
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}
insertId, err := result.LastInsertId()
if err != nil {
log.Fatal(err)
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}
affectedRows, err := result.RowsAffected()
if err != nil {
log.Fatal(err)
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}
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response.Success = affectedRows > 0
response.Id = int(insertId)
}
js, err := json.Marshal(response)
if err != nil {
log.Fatal(err)
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}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func removeCategory(rw http.ResponseWriter, req *http.Request) {
type Request struct {
Id int `json:"id"`
}
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type Response struct {
Success bool `json:"success"`
}
var request Request
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if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
result, err := db.Exec("DELETE FROM categories WHERE id = (?)", request.Id)
if err != nil {
log.Fatal(err)
}
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affectedRows, err := result.RowsAffected()
if err != nil {
log.Fatal(err)
}
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js, err := json.Marshal(Response{affectedRows > 0})
if err != nil {
log.Fatal(err)
}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func accessReview(rw http.ResponseWriter, req *http.Request) {
}
func getStaticPath() (string, error) {
if len(os.Args) > 1 {
return os.Args[1], nil
}
return filepath.Abs(filepath.Join(filepath.Dir(os.Args[0]), "static"))
}
func main() {
dir, err := getStaticPath()
if err != nil {
log.Fatal(err)
}
db, err = sql.Open("mysql", "hscd@/hscd")
if err != nil {
log.Fatal(err)
}
defer db.Close()
http.HandleFunc("/query", executeQuery)
http.HandleFunc("/categories", getCategories)
http.HandleFunc("/learn", addCategory)
http.HandleFunc("/forget", removeCategory)
http.HandleFunc("/access", accessReview)
http.Handle("/", http.FileServer(http.Dir(dir)))
log.Fatal(http.ListenAndServe(":3000", nil))
}