|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "database/sql" |
| 5 | + "encoding/json" |
| 6 | + "encoding/xml" |
| 7 | + "io/ioutil" |
| 8 | + "log" |
| 9 | + "net/http" |
| 10 | + "net/url" |
| 11 | + "text/template" |
| 12 | + |
| 13 | + _ "github.com/mattn/go-sqlite3" |
| 14 | + "github.com/urfave/negroni" |
| 15 | +) |
| 16 | + |
| 17 | +var port = ":8080" |
| 18 | + |
| 19 | +type Page struct { |
| 20 | + Name string |
| 21 | + DBStatus bool |
| 22 | +} |
| 23 | + |
| 24 | +type SearchResult struct { |
| 25 | + Title string `xml:"title,attr"` |
| 26 | + Author string `xml:"author,attr"` |
| 27 | + Year string `xml:"hyr,attr"` |
| 28 | + ID string `xml:"owi,attr"` |
| 29 | +} |
| 30 | + |
| 31 | +type ClassifySearchResponse struct { |
| 32 | + Results []SearchResult `xml:"works>work"` |
| 33 | +} |
| 34 | + |
| 35 | +type ClassifyBookResponse struct { |
| 36 | + BookData struct { |
| 37 | + Title string `xml:"title,attr"` |
| 38 | + Author string `xml:"author,attr"` |
| 39 | + ID string `xml:"owi,attr"` |
| 40 | + } `xml:"work"` |
| 41 | + Classification struct { |
| 42 | + MostPopular string `xml:"sfa,attr"` |
| 43 | + } `xml:"recommandations>ddc>mostPopular"` |
| 44 | +} |
| 45 | + |
| 46 | +var db *sql.DB |
| 47 | + |
| 48 | +func verifyDBConnection(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) { |
| 49 | + err := db.Ping() |
| 50 | + if err != nil { |
| 51 | + log.Println("verifyDBConnection :: DB not connected") |
| 52 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 53 | + } else { |
| 54 | + next(w, r) |
| 55 | + } |
| 56 | + |
| 57 | +} |
| 58 | + |
| 59 | +func main() { |
| 60 | + log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Llongfile) |
| 61 | + |
| 62 | + templates := template.Must(template.ParseFiles("templates/index.html")) |
| 63 | + |
| 64 | + db, _ = sql.Open("sqlite3", "dev.db") |
| 65 | + |
| 66 | + mux := http.NewServeMux() |
| 67 | + |
| 68 | + mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { |
| 69 | + err := templates.ExecuteTemplate(w, "index.html", nil) |
| 70 | + if err != nil { |
| 71 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 72 | + return |
| 73 | + } |
| 74 | + }) |
| 75 | + |
| 76 | + mux.HandleFunc("/search", func(w http.ResponseWriter, r *http.Request) { |
| 77 | + qs := r.FormValue("queryString") |
| 78 | + log.Println("/search => qs = ", qs) |
| 79 | + results, err := search(qs) |
| 80 | + if err != nil { |
| 81 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 82 | + return |
| 83 | + } |
| 84 | + encoder := json.NewEncoder(w) |
| 85 | + err = encoder.Encode(results) |
| 86 | + if err != nil { |
| 87 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 88 | + return |
| 89 | + } |
| 90 | + }) |
| 91 | + |
| 92 | + mux.HandleFunc("/books/add", func(w http.ResponseWriter, r *http.Request) { |
| 93 | + qs := r.FormValue("id") |
| 94 | + log.Println("/book/add => qs = ", qs) |
| 95 | + |
| 96 | + book, err := find(qs) |
| 97 | + if err != nil { |
| 98 | + log.Println("/books/add qs = ", qs, " error while finding ", " error = ", err.Error()) |
| 99 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 100 | + return |
| 101 | + } |
| 102 | + |
| 103 | + if book.BookData.Title == "" { |
| 104 | + log.Println("/books/add qs = ", qs, " This book is not popular") |
| 105 | + http.Error(w, "This book is not popular", http.StatusNoContent) |
| 106 | + return |
| 107 | + } |
| 108 | + |
| 109 | + _, err = db.Exec("insert into books (pk, title, author, id, classification) values (?, ?, ?, ?, ?)", |
| 110 | + nil, book.BookData.Title, book.BookData.Author, book.BookData.ID, book.Classification.MostPopular) |
| 111 | + if err != nil { |
| 112 | + log.Println("/books/add qs = ", qs, " error while inserting into DB error = ", err.Error()) |
| 113 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 114 | + return |
| 115 | + } |
| 116 | + |
| 117 | + log.Println("/books/add qs = ", qs, " successfully inserted into db") |
| 118 | + |
| 119 | + encoder := json.NewEncoder(w) |
| 120 | + err = encoder.Encode(book) |
| 121 | + if err != nil { |
| 122 | + http.Error(w, err.Error(), http.StatusInternalServerError) |
| 123 | + return |
| 124 | + } |
| 125 | + }) |
| 126 | + |
| 127 | + n := negroni.Classic() |
| 128 | + n.Use(negroni.HandlerFunc(verifyDBConnection)) |
| 129 | + n.UseHandler(mux) |
| 130 | + n.Run(port) |
| 131 | +} |
| 132 | + |
| 133 | +func search(query string) (results []SearchResult, err error) { |
| 134 | + var searchURL = "http://classify.oclc.org/classify2/Classify?&summary=true&title=" |
| 135 | + var body []byte |
| 136 | + var csr ClassifySearchResponse |
| 137 | + |
| 138 | + searchURL = searchURL + url.QueryEscape(query) |
| 139 | + |
| 140 | + log.Println("func search ::url = ", searchURL) |
| 141 | + |
| 142 | + body, err = classifyAPI(searchURL) |
| 143 | + if err != nil { |
| 144 | + log.Println("func search :: err while requesting ", "url = ", searchURL, " error = ", err.Error()) |
| 145 | + return |
| 146 | + } |
| 147 | + |
| 148 | + err = xml.Unmarshal(body, &csr) |
| 149 | + if err != nil { |
| 150 | + log.Println("func search :: err while Unmarshalling ", "url = ", searchURL, " error = ", err.Error()) |
| 151 | + return |
| 152 | + } |
| 153 | + results = csr.Results |
| 154 | + |
| 155 | + return |
| 156 | +} |
| 157 | + |
| 158 | +func find(id string) (cbr ClassifyBookResponse, err error) { |
| 159 | + var searchURL = "http://classify.oclc.org/classify2/Classify?&summary=true&owi=" |
| 160 | + var body []byte |
| 161 | + |
| 162 | + searchURL = searchURL + url.QueryEscape(id) |
| 163 | + |
| 164 | + log.Println("func find ::url = ", searchURL) |
| 165 | + |
| 166 | + body, err = classifyAPI(searchURL) |
| 167 | + if err != nil { |
| 168 | + log.Println("func find :: err while requesting ", "url = ", searchURL, " error = ", err.Error()) |
| 169 | + return |
| 170 | + } |
| 171 | + |
| 172 | + //log.Println("func find ::url = ", searchURL, " obtained body body = ", string(body)) |
| 173 | + |
| 174 | + err = xml.Unmarshal(body, &cbr) |
| 175 | + if err != nil { |
| 176 | + log.Println("func find :: err while Unmarshalling ", "url = ", searchURL, " error = ", err.Error()) |
| 177 | + return |
| 178 | + } |
| 179 | + |
| 180 | + log.Println("func find ::url = ", searchURL, " successfully unmarshalled cbr = ", cbr) |
| 181 | + |
| 182 | + return |
| 183 | +} |
| 184 | + |
| 185 | +func classifyAPI(url string) (body []byte, err error) { |
| 186 | + var resp *http.Response |
| 187 | + |
| 188 | + resp, err = http.Get(url) |
| 189 | + if err != nil { |
| 190 | + log.Println("func classifyAPI :: err while requesting ", "url = ", url, " error = ", err.Error()) |
| 191 | + return |
| 192 | + } |
| 193 | + defer resp.Body.Close() |
| 194 | + |
| 195 | + body, err = ioutil.ReadAll(resp.Body) |
| 196 | + if err != nil { |
| 197 | + log.Println("func classifyAPI :: err while parsing the body ", "url = ", url, " error = ", err.Error()) |
| 198 | + return |
| 199 | + } |
| 200 | + |
| 201 | + return |
| 202 | +} |
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