1
restaurant-search/server.go
2015-03-25 19:57:42 +09:00

283 lines
7.0 KiB
Go

/*
* 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"
"os"
"path/filepath"
"strings"
)
var db *sql.DB
func executeQuery(rw http.ResponseWriter, req *http.Request) {
var request jsonQueryRequest
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
var geo *geoContext
if request.Geo != nil {
geo = &geoContext{request.Geo.Latitude, request.Geo.Longitude}
}
entries := getRecords(queryContext{geo, request.Profile, request.WalkingDist})
features := fixFeatures(request.Features)
foundEntries := findRecords(entries, features, request.MinScore)
response := jsonQueryResponse{
Count: len(foundEntries),
Columns: make(map[string]jsonColumn),
Items: make([]jsonRecord, 0)}
for name, value := range features {
column := jsonColumn{Value: value, Steps: request.HintSteps}
hints := project(
foundEntries,
features,
name,
request.MinScore,
queryBounds{request.Range.Min, request.Range.Max},
request.HintSteps)
for _, hint := range hints {
jsonHint := jsonProjection{
Sample: hint.sample,
Stats: jsonStats{hint.stats.compatibility, hint.stats.count}}
column.Hints = append(column.Hints, jsonHint)
}
response.Columns[name] = column
}
for index, value := range foundEntries {
if index >= request.MaxResults {
break
}
item := jsonRecord{
Name: value.name,
Score: value.score,
DistanceToUser: value.distanceToUser,
DistanceToStn: value.distanceToStn,
ClosestStn: value.closestStn,
AccessCount: value.accessCount,
Id: value.id}
response.Items = append(response.Items, item)
}
js, err := json.Marshal(response)
if err != nil {
log.Fatal(err)
}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func getCategories(rw http.ResponseWriter, req *http.Request) {
categoryRows, err := db.Query("SELECT description, id FROM categories")
if err != nil {
log.Fatal(err)
}
defer categoryRows.Close()
var categories []jsonCategory
for categoryRows.Next() {
var (
description string
id int
)
if err := categoryRows.Scan(&description, &id); err != nil {
log.Fatal(err)
}
categories = append(categories, jsonCategory{description, id})
}
if err := categoryRows.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) {
var request jsonAddCategoryRequest
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
response := jsonAddCategoryResponse{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)
}
insertId, err := result.LastInsertId()
if err != nil {
log.Fatal(err)
}
affectedRows, err := result.RowsAffected()
if err != nil {
log.Fatal(err)
}
response.Success = affectedRows > 0
response.Id = int(insertId)
}
js, err := json.Marshal(response)
if err != nil {
log.Fatal(err)
}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func removeCategory(rw http.ResponseWriter, req *http.Request) {
var request jsonRemoveCategoryRequest
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)
}
affectedRows, err := result.RowsAffected()
if err != nil {
log.Fatal(err)
}
js, err := json.Marshal(jsonRemoveCategoryResponse{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) {
var request jsonAccessRequest
if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
reviewRow := db.QueryRow("SELECT url FROM reviews WHERE id = (?) LIMIT 1", request.Id)
var reply jsonAccessReply
if err := reviewRow.Scan(&reply.Url); err == nil {
reply.Url = "http://www.tripadvisor.com" + reply.Url
reply.Success = true
}
if reply.Success {
_, err := db.Exec("UPDATE reviews SET accessCount = accessCount + 1 WHERE id = (?)", request.Id)
if err != nil {
log.Fatal(err)
}
if len(request.Profile) > 0 {
result, err := db.Exec("INSERT INTO history(date, reviewId) VALUES(NOW(), ?)", request.Id)
if err != nil {
log.Fatal(err)
}
insertId, err := result.LastInsertId()
if err != nil {
log.Fatal(err)
}
for id, value := range request.Profile {
if _, err := db.Exec("INSERT INTO historyGroups(categoryId, categoryValue, historyId) VALUES(?, ?, ?)", id, value, insertId); err != nil {
log.Fatal(err)
}
}
}
}
js, err := json.Marshal(reply)
if err != nil {
log.Fatal(err)
}
rw.Header().Set("Content-Type", "application/json")
rw.Write(js)
}
func staticPath() (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 := staticPath()
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(":8080", nil))
}