Go Benchmark

bench.go

package main

import (
        "encoding/json"
        "flag"
        "fmt"
        "io"
        "log"
        "net/http"

        "github.com/jmoiron/sqlx"
        _ "github.com/mattn/go-sqlite3"
)

func Plaintext(w http.ResponseWriter, req *http.Request) {
        io.WriteString(w, "Hello World!\n")
}

type JSONStruct struct {
        Array  []int          `json:"array"`
        Dict   map[string]int `json:"dict"`
        Int    int            `json:"int"`
        String string         `json:"string"`
        Double float64        `json:"double"`
        Null   interface{}    `json:"null"`
}

func JSON(w http.ResponseWriter, req *http.Request) {
        j := JSONStruct{Array: []int{1, 2, 3},
                Dict:   map[string]int{"one": 1, "two": 2, "three": 3},
                Int:    42,
                String: "test",
                Double: 3.14,
                Null:   nil}

        b, _ := json.MarshalIndent(j, "", " ")
        io.WriteString(w, string(b))
}

type User struct {
        ID    int    `db:"id" json:"id,omitempty"`
        Name  string `db:"name" json:"name,omitempty"`
        Email string `db:"email" json:"email,omitempty"`
}

// typical usage would keep or cache the open DB connection
var db, _ = sqlx.Open("sqlite3", "../database/test.sqlite")

func SQLiteFetch(w http.ResponseWriter, req *http.Request) {
        user := User{}
        rows, err := db.Queryx("select * from users order by random() limit 1")
        if err != nil {
                log.Fatal(err)
        }
        defer rows.Close()

        for rows.Next() {
                err = rows.StructScan(&user)
                if err != nil {
                        log.Fatal(err)
                }

                b, _ := json.MarshalIndent(user, "", " ")
                io.WriteString(w, string(b))
        }
}

var portNumber int

func main() {
        flag.IntVar(&portNumber, "port", 8300, "port number to listen on")
        flag.Parse()

        http.HandleFunc("/plaintext", Plaintext)
        http.HandleFunc("/json", JSON)
        http.HandleFunc("/sqlite-fetch", SQLiteFetch)

        log.Println("bench running on", fmt.Sprintf("%d", portNumber))

        err := http.ListenAndServe(fmt.Sprintf(":%d", portNumber), nil)
        if err != nil {
                log.Fatal(err)
        }
}