mirror of https://github.com/jackc/pgx.git
123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package main
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import (
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"io/ioutil"
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"net/http"
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"os"
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"github.com/jackc/pgx"
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"github.com/jackc/pgx/log/log15adapter"
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log "gopkg.in/inconshreveable/log15.v2"
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)
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var pool *pgx.ConnPool
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// afterConnect creates the prepared statements that this application uses
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func afterConnect(conn *pgx.Conn) (err error) {
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_, err = conn.Prepare("getUrl", `
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select url from shortened_urls where id=$1
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`)
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if err != nil {
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return
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}
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_, err = conn.Prepare("deleteUrl", `
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delete from shortened_urls where id=$1
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`)
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if err != nil {
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return
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}
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_, err = conn.Prepare("putUrl", `
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insert into shortened_urls(id, url) values ($1, $2)
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on conflict (id) do update set url=excluded.url
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`)
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return
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}
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func getUrlHandler(w http.ResponseWriter, req *http.Request) {
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var url string
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err := pool.QueryRow("getUrl", req.URL.Path).Scan(&url)
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switch err {
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case nil:
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http.Redirect(w, req, url, http.StatusSeeOther)
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case pgx.ErrNoRows:
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http.NotFound(w, req)
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default:
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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}
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}
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func putUrlHandler(w http.ResponseWriter, req *http.Request) {
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id := req.URL.Path
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var url string
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if body, err := ioutil.ReadAll(req.Body); err == nil {
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url = string(body)
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} else {
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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return
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}
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if _, err := pool.Exec("putUrl", id, url); err == nil {
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w.WriteHeader(http.StatusOK)
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} else {
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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}
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}
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func deleteUrlHandler(w http.ResponseWriter, req *http.Request) {
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if _, err := pool.Exec("deleteUrl", req.URL.Path); err == nil {
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w.WriteHeader(http.StatusOK)
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} else {
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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}
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}
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func urlHandler(w http.ResponseWriter, req *http.Request) {
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switch req.Method {
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case "GET":
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getUrlHandler(w, req)
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case "PUT":
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putUrlHandler(w, req)
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case "DELETE":
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deleteUrlHandler(w, req)
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default:
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w.Header().Add("Allow", "GET, PUT, DELETE")
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w.WriteHeader(http.StatusMethodNotAllowed)
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}
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}
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func main() {
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logger := log15adapter.NewLogger(log.New("module", "pgx"))
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var err error
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connPoolConfig := pgx.ConnPoolConfig{
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ConnConfig: pgx.ConnConfig{
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Host: "127.0.0.1",
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User: "jack",
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Password: "jack",
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Database: "url_shortener",
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Logger: logger,
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},
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MaxConnections: 5,
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AfterConnect: afterConnect,
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}
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pool, err = pgx.NewConnPool(connPoolConfig)
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if err != nil {
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log.Crit("Unable to create connection pool", "error", err)
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os.Exit(1)
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}
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http.HandleFunc("/", urlHandler)
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log.Info("Starting URL shortener on localhost:8080")
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err = http.ListenAndServe("localhost:8080", nil)
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if err != nil {
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log.Crit("Unable to start web server", "error", err)
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os.Exit(1)
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}
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}
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