improved readabilty

score 8/10

api/pizzaVersion.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+type inbound struct {
+	Language string  `json:"language"`
+	Source   string  `json:"source"`
+}
+
+type problem struct {
+	Code    string  `json:"code"`
+	Message string  `json:"message"`
+}
+
+type outbound struct {
+	Ran    bool    `json:"ran"`
+	Output string  `json:"output"`
+}
+
+func main() {
+	http.HandleFunc("/execute", Execute)
+
+	http.ListenAndServe("0.0.0.0:1337", nil)
+}
+
+func Execute(res http.ResponseWriter, req *http.Request) {
+	var found = false
+	res.Header().Set("Content-Type", "application/json")
+
+	// get json
+	inbound := inbound{}
+	message := json.NewDecoder(req.Body)
+	message.Decode(&inbound)
+
+	whitelist := []string{
+		"python2",
+		"python",
+		"python3",
+		"ruby",
+		"javascript",
+		"js",
+		"node",
+	}
+
+	// check if the supplied language is supported
+	// now calls function and returns
+	for _, lang := range whitelist {
+		if lang == inbound.Language {
+			launch(inbound, res)
+			return
+		}
+	}
+
+	// now only called when the language is not supported
+	if !found {
+		problem := problem{
+			Code: "unsupported_language",
+			Message: inbound.Language + " is not supported by Piston",
+		}
+
+		pres, _ := json.Marshal(problem)
+
+		res.Write(pres)
+		return
+	}
+}
+
+func launch(inbound2 inbound, res http.ResponseWriter){
+	// write the code to temp dir
+	filename := fmt.Sprintf("/tmp/%d.code", time.Now().UnixNano())
+
+	ioutil.WriteFile(filename, []byte(inbound2.Source), 0644)
+
+	// set up the execution
+	cmd := exec.Command("../docker/execute", inbound2.Language, filename)
+
+	// capture out/err
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+
+	// prepare response
+	outbound := outbound{
+		Ran: err == nil,
+		Output: strings.TrimSpace(stdout.String()),
+	}
+
+	response, _ := json.Marshal(outbound)
+
+	res.Write(response)
+}