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@@ -0,0 +1,219 @@
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+package main
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+
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+import (
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+ "database/sql"
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+ "encoding/json"
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+ "flag"
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+ "fmt"
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+ "html/template"
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+ "log"
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+ "math/rand"
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+ "net/http"
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+ "os"
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+ "sort"
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+ "strconv"
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+
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+ _ "github.com/lib/pq"
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+)
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+
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+type Message struct {
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+ Message string `json:"message"`
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+}
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+
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+type World struct {
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+ Id uint16 `json:"id"`
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+ RandomNumber uint16 `json:"randomNumber"`
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+}
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+
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+type Fortune struct {
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+ Id uint16 `json:"id"`
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+ Message string `json:"message"`
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+}
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+
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+const (
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+ // Content
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+ fortuneHTML = `<!DOCTYPE html>
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+<html>
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+<head>
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+<title>Fortunes</title>
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+</head>
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+<body>
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+<table>
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+<tr>
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+<th>id</th>
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+<th>message</th>
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+</tr>
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+{{range .}}
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+<tr>
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+<td>{{.Id}}</td>
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+<td>{{.Message}}</td>
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+</tr>
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+{{end}}
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+</table>
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+</body>
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+</html>`
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+
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+ // Database
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+ connectionString = "postgres://benchmarkdbuser:benchmarkdbpass@%s/hello_world?sslmode=disable"
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+ worldSelect = "SELECT id, randomNumber FROM World WHERE id = $1"
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+ worldUpdate = "UPDATE World SET randomNumber = $1 WHERE id = $2"
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+ fortuneSelect = "SELECT id, message FROM Fortune"
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+ worldRowCount = 10000
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+ maxConnections = 256
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+)
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+
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+var (
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+ // Templates
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+ tmpl = template.Must(template.New("fortune.html").Parse(fortuneHTML))
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+
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+ // Database
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+ db *sql.DB
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+ worldSelectPrepared *sql.Stmt
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+ worldUpdatePrepared *sql.Stmt
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+ fortuneSelectPrepared *sql.Stmt
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+)
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+
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+func initDB() {
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+ var err error
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+ var dbhost = os.Getenv("DBHOST")
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+ if dbhost == "" {
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+ dbhost = "localhost"
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+ }
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+ db, err = sql.Open("postgres", fmt.Sprintf(connectionString, dbhost))
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+ if err != nil {
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+ log.Fatalf("Error opening database: %v", err)
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+ }
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+ db.SetMaxIdleConns(maxConnections)
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+ db.SetMaxOpenConns(maxConnections)
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+
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+ worldSelectPrepared, err = db.Prepare(worldSelect)
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+ if err != nil {
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+ log.Fatal(err)
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+ }
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+ worldUpdatePrepared, err = db.Prepare(worldUpdate)
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+ if err != nil {
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+ log.Fatal(err)
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+ }
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+ fortuneSelectPrepared, err = db.Prepare(fortuneSelect)
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+ if err != nil {
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+ log.Fatal(err)
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+ }
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+}
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+
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+func main() {
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+ flag.Parse()
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+
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+ initDB()
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+
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+ http.HandleFunc("/db", dbHandler)
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+ http.HandleFunc("/queries", queriesHandler)
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+ http.HandleFunc("/fortune", fortuneHandler)
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+ http.HandleFunc("/update", updateHandler)
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+
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+ log.Fatal(http.ListenAndServe(":8080", nil))
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+}
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+
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+func getQueriesParam(r *http.Request) int {
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+ n := 1
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+ if nStr := r.URL.Query().Get("queries"); len(nStr) > 0 {
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+ n, _ = strconv.Atoi(nStr)
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+ }
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+
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+ if n < 1 {
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+ n = 1
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+ } else if n > 500 {
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+ n = 500
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+ }
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+ return n
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+}
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+
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+// Test 2: Single database query
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+func dbHandler(w http.ResponseWriter, r *http.Request) {
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+ var world World
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+ err := worldSelectPrepared.QueryRow(rand.Intn(worldRowCount)+1).Scan(&world.Id, &world.RandomNumber)
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+ if err != nil {
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+ log.Fatalf("Error scanning world row: %s", err.Error())
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+ }
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+
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+ w.Header().Set("Server", "Go")
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+ w.Header().Set("Content-Type", "application/json")
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+ json.NewEncoder(w).Encode(&world)
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+}
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+
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+// Test 3: Multiple database queries
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+func queriesHandler(w http.ResponseWriter, r *http.Request) {
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+ n := getQueriesParam(r)
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+
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+ world := make([]World, n)
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+ for i := 0; i < n; i++ {
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+ err := worldSelectPrepared.QueryRow(rand.Intn(worldRowCount)+1).Scan(&world[i].Id, &world[i].RandomNumber)
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+ if err != nil {
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+ log.Fatalf("Error scanning world row: %v", err)
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+ }
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+ }
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+
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+ w.Header().Set("Server", "Go")
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+ w.Header().Set("Content-Type", "application/json")
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+ json.NewEncoder(w).Encode(world)
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+}
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+
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+// Test 4: Fortunes
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+func fortuneHandler(w http.ResponseWriter, r *http.Request) {
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+ rows, err := fortuneSelectPrepared.Query()
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+ if err != nil {
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+ log.Fatalf("Error preparing statement: %v", err)
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+ }
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+ defer rows.Close()
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+
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+ fortunes := fetchFortunes(rows)
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+ fortunes = append(fortunes, &Fortune{Message: "Additional fortune added at request time."})
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+
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+ sort.Sort(ByMessage{fortunes})
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+ w.Header().Set("Server", "Go")
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+ w.Header().Set("Content-Type", "text/html; charset=utf-8")
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+ if err := tmpl.Execute(w, fortunes); err != nil {
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+ http.Error(w, err.Error(), http.StatusInternalServerError)
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+ }
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+}
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+
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+func fetchFortunes(rows *sql.Rows) Fortunes {
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+ fortunes := make(Fortunes, 0, 16)
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+ for rows.Next() { // Fetch rows
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+ fortune := Fortune{}
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+ if err := rows.Scan(&fortune.Id, &fortune.Message); err != nil {
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+ log.Fatalf("Error scanning fortune row: %s", err.Error())
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+ }
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+ fortunes = append(fortunes, &fortune)
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+ }
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+ return fortunes
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+}
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+
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+// Test 5: Database updates
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+func updateHandler(w http.ResponseWriter, r *http.Request) {
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+ n := getQueriesParam(r)
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+
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+ world := make([]World, n)
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+ for i := 0; i < n; i++ {
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+ if err := worldSelectPrepared.QueryRow(rand.Intn(worldRowCount)+1).Scan(&world[i].Id, &world[i].RandomNumber); err != nil {
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+ log.Fatalf("Error scanning world row: %v", err)
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+ }
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+ world[i].RandomNumber = uint16(rand.Intn(worldRowCount) + 1)
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+ if _, err := worldUpdatePrepared.Exec(world[i].RandomNumber, world[i].Id); err != nil {
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+ log.Fatalf("Error updating world row: %v", err)
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+ }
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+ }
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+
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+ w.Header().Set("Server", "Go")
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+ w.Header().Set("Content-Type", "application/json")
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+ encoder := json.NewEncoder(w)
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+ encoder.Encode(world)
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+}
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+
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+type Fortunes []*Fortune
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+
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+func (s Fortunes) Len() int { return len(s) }
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+func (s Fortunes) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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+
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+type ByMessage struct{ Fortunes }
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+
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+func (s ByMessage) Less(i, j int) bool { return s.Fortunes[i].Message < s.Fortunes[j].Message }
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msmith-techempower