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server.go
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server.go
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package main
import (
"fmt"
"net/http"
"os"
"strconv"
"time"
"github.com/go-london-user-group/study-group/workspaces/billglover/exercises/01_tutorial/ex1.12/lissajous"
)
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", handler)
server := http.Server{
Addr: ":8080",
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 120 * time.Second,
Handler: mux,
}
err := server.ListenAndServe()
if err != nil {
fmt.Fprintf(os.Stderr, "server: %v\n", err)
os.Exit(1)
}
}
func handler(w http.ResponseWriter, r *http.Request) {
cycles, err := strconv.Atoi(r.URL.Query().Get("cycles"))
if err != nil || cycles <= 0 {
// if a cycles value was set then return an error
if r.URL.Query().Get("cycles") != "" {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "unable to parse 'cycles', not a positive integer")
return
}
// otherwise use a default value
cycles = 5
}
freq, err := strconv.ParseFloat(r.URL.Query().Get("freq"), 64)
if err != nil {
// if a freq value was set then return an error
if r.URL.Query().Get("freq") != "" {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "unable to parse 'freq', not a number")
return
}
// otherwise use a default value
freq = 3.0
}
lissajous.Lissajous(w, float64(cycles), freq)
}