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phase_two_server.go
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/
phase_two_server.go
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package main
import (
"bufio"
"encoding/csv"
"fmt"
"github.com/docopt/docopt-go"
"html/template"
"log"
"net/http"
"os"
"strings"
)
type Comments struct {
Negative []string
Positive []string
}
func readCSVFile(filePath string) [][]string {
f, err := os.Open(filePath)
if err != nil {
log.Fatal("Unable to read input file "+filePath, err)
}
defer f.Close()
csvReader := csv.NewReader(f)
records, err := csvReader.ReadAll()
if err != nil {
log.Fatal("Unable to parse file as CSV for "+filePath, err)
}
return records
}
func filterResponses(records [][]string) Comments {
var negComments []string
var posComments []string
for _, row := range records {
if strings.HasPrefix(row[2], "neg_") {
if row[3] != "" {
negComments = append(negComments, row[3])
}
} else {
if row[3] != "" {
posComments = append(posComments, row[3])
}
}
}
return Comments{
Negative: negComments,
Positive: posComments,
}
}
// App creates a mux and binds the root route for processing
// static files.
func startServing() http.Handler {
// Create a new mux for this service.
m := http.NewServeMux()
// m.Handle("/", http.FileServer(http.Dir("./static")))
m.HandleFunc("/", displayCollector)
m.HandleFunc("/reply", collectResponses)
return m
}
func appendTo(file string, data []string) {
fileHandle, err := os.OpenFile(file, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0666)
if err != nil {
log.Println(err)
}
writer := bufio.NewWriter(fileHandle)
defer fileHandle.Close()
dataStr := strings.Join(data, ",")
csvLine := fmt.Sprintf("%s", dataStr)
fmt.Fprintln(writer, csvLine)
writer.Flush()
}
func displayCollector(w http.ResponseWriter, r *http.Request) {
indexHTMLTemplate := `<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdn.rawgit.com/Chalarangelo/mini.css/v3.0.1/dist/mini-default.min.css">
</head>
<body>
<h2>Do you agree on your class-mates' statements?</h2>
<p>Please select (set a checkmark) on each comment that you agree on.</p>
<form action="/reply">
<h3>Negative Comments</h3>
<ul>
{{range $index, $element := .Negative}}
<li><input type="checkbox" name="neg_{{$index}}" value="{{$element}}"> {{$element}}</li>
{{end}}
</ul>
<hr>
<h3>Positive Comments</h3>
<ul>
{{range $index, $element := .Positive}}
<li><input type="checkbox" name="pos_{{$index}}" value="{{$element}}"> {{$element}}</li>
{{end}}
</ul>
<br>
<input type="submit" value="Submit">
</form>
</body>
</html>
`
t, err := template.New("comments").Parse(indexHTMLTemplate)
if err != nil {
// TODO: check how to handle this precisely
panic(err)
}
// the global variable comments of type Comments
t.Execute(w, comments)
}
// Inspired by https://www.veracode.com/blog/2013/12/golangs-context-aware-html-templates
func collectResponses(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
http.Error(w, "Error parsing form values!", http.StatusInternalServerError)
return
}
// get the form values
for key, value := range r.Form {
commentStr := value[0]
commentStr = strings.Replace(commentStr, "\"", "\"\"", -1)
commentStr = fmt.Sprintf("\"%s\"", commentStr)
data := []string{key, commentStr}
appendTo("rated_responses.txt", data)
}
thankYouHTML := `<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdn.rawgit.com/Chalarangelo/mini.css/v3.0.1/dist/mini-default.min.css">
</head>
<body>
<h1>Thank you for your feedback!</h1>
</body>
</html>
`
fmt.Fprintf(w, thankYouHTML)
}
var comments Comments
func main() {
usage := `Delphi Evaluation Phase Two Server.
Start me for example like:
$ ./phase_two_server --addr=0.0.0.0 --port=9999 >> log/phase_two.log 2>&1 &
Usage:
phase_two_server [--addr=<addr>] [--port=<port>]
phase_two_server -h | --help
phase_two_server --version
Options:
-h --help Show this screen.
--version Show version.
--addr=<addr> Address for serving [default: 127.0.0.1].
--port=<port> Port for serving [default: 8080].
Hint:
To quickly count the for the most rated comments run:
$ sort rated_responses.txt | uniq -c | sort -r
`
arguments, _ := docopt.Parse(usage, nil, true, "Delphi Evaluation Phase Two Server 1.0", false)
port := arguments["--port"].(string)
addr := arguments["--addr"].(string)
// Be aware of that the responses file is read on server startup! That is
// do not start the server before that file is in a state that you like
responses := readCSVFile("./responses.txt")
comments = filterResponses(responses)
log.Print(fmt.Sprintf("Serving on http://%s:%s", addr, port))
log.Fatal(http.ListenAndServe(fmt.Sprintf("%s:%s", addr, port), startServing()))
}