/
brestagenda.go
396 lines (366 loc) · 7.97 KB
/
brestagenda.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"sort"
"strings"
"text/template"
"time"
"github.com/PuerkitoBio/goquery"
"github.com/alecthomas/kingpin"
)
type Event struct {
Title string
Desc string
Category string
Link string
Start time.Time
End time.Time
}
func extractEvents(doc *goquery.Document, baseUrl *url.URL) ([]Event, error) {
timeLayout := "2006-01-02"
events := []Event{}
items := doc.Find("article[class~='list-type-1__item']")
for i := range items.Nodes {
item := items.Eq(i)
title := item.Find("h2").First().Text()
desc := item.Find("p[class~='teaser-1']").First().Text()
cat := item.Find("p[class~='category']").First().Text()
link, _ := item.Find("a[class='link-bloc']").First().Attr("href")
relUrl, err := url.Parse(link)
if err != nil {
return nil, err
}
relUrl = baseUrl.ResolveReference(relUrl)
dates := item.Find("p[class='date-2'] time")
start, _ := dates.Eq(0).Attr("datetime")
end, _ := dates.Eq(1).Attr("datetime")
ev := Event{
Title: strings.TrimSpace(title),
Desc: strings.TrimSpace(desc),
Category: strings.TrimSpace(cat),
Link: relUrl.String(),
}
ev.Start, err = time.Parse(timeLayout, start)
if err != nil {
return nil, err
}
if end != "" {
ev.End, err = time.Parse(timeLayout, end)
if err != nil {
return nil, err
}
}
events = append(events, ev)
}
return events, nil
}
var ServerError = fmt.Errorf("server error")
type Page struct {
Events []Event
Next string
}
func getPage(client *http.Client, url, base *url.URL, dumpDir string, pageNum int) (
*Page, error) {
rsp, err := client.Get(url.String())
if err != nil {
return nil, err
}
defer rsp.Body.Close()
if rsp.StatusCode != 200 {
if rsp.StatusCode == 500 {
// Cannot do anything about it, try to generate with what we got.
return nil, ServerError
}
return nil, fmt.Errorf("GET got %d", rsp.StatusCode)
}
var r io.Reader = rsp.Body
if dumpDir != "" {
path := filepath.Join(dumpDir, fmt.Sprintf("%d.html", pageNum))
fmt.Println("writing", path)
data, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return nil, err
}
err = ioutil.WriteFile(path, data, 0644)
if err != nil {
return nil, err
}
r = bytes.NewReader(data)
}
doc, err := goquery.NewDocumentFromReader(r)
if err != nil {
return nil, err
}
events, err := extractEvents(doc, base)
if err != nil {
return nil, err
}
s := doc.Find("link[rel='next']").First()
u, _ := s.Attr("href")
page := Page{
Events: events,
Next: u,
}
return &page, nil
}
var (
crawlCmd = app.Command("crawl", "crawl brest.fr agenda")
crawlPathArg = crawlCmd.Arg("path", "output JSON path").Required().String()
crawlDumpDir = crawlCmd.Flag("dump-dir", "optionally dump page content").String()
)
func crawlFn() error {
outPath := *crawlPathArg
dumpDir := ""
if crawlDumpDir != nil && len(*crawlDumpDir) > 0 {
dumpDir = *crawlDumpDir
err := os.MkdirAll(dumpDir, 0755)
if err != nil {
return err
}
}
client := &http.Client{
Timeout: 30 * time.Second,
}
baseUrl, err := url.Parse("https://www.brest.fr")
if err != nil {
return err
}
path := "/actus-agenda/agenda-132.html"
events := []Event{}
pages := 0
for {
u, err := url.Parse(path)
if err != nil {
return err
}
u = baseUrl.ResolveReference(u)
fmt.Println("GET", u)
p, err := getPage(client, u, baseUrl, dumpDir, pages)
if err != nil {
if err == ServerError {
// Ignore 500 errors for now. There is one happening at each
// crawl and I cannot do anything about it.
break
}
return err
}
path = p.Next
events = append(events, p.Events...)
if path == "" {
break
}
pages += 1
}
if len(events) == 0 {
return fmt.Errorf("no event found")
}
fp, err := os.Create(outPath)
if err != nil {
return err
}
defer fp.Close()
err = json.NewEncoder(fp).Encode(&events)
if err != nil {
return err
}
return nil
}
const PageTemplate = `
<html>
<header>
<meta charset="utf-8">
<title>Agenda Brest</title>
<style>
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
a:active {
text-decoration: underline;
}
</style>
</header>
<body>
<table>
{{range .Before}}
<tr>
<td style="white-space:nowrap">{{.Start}}</td>
<td>→</td>
<td style="white-space:nowrap">{{.End}}</td>
<td>[{{.Weekday}}]</td>
<td>{{.DeltaStr}}</td>
<td><a href="{{.Link}}">{{.Title}}</a></td>
</tr>
{{end}}
{{if .HasAfter}}
</table>
<hr id="now"></hr>
<table>
{{end}}
{{range .After}}
<tr>
<td style="white-space:nowrap">{{.Start}}</td>
<td>→</td>
<td style="white-space:nowrap">{{.End}}</td>
<td>[{{.Weekday}}]</td>
<td>{{.DeltaStr}}</td>
<td><a href="{{.Link}}">{{.Title}}</a></td>
</tr>
{{end}}
</table>
</body>
</html>
`
type HtmlEntry struct {
Link string
Start string
End string
DeltaStr string
Delta int
Title string
Weekday string
}
type sortedEntries []HtmlEntry
func (ev sortedEntries) Len() int {
return len(ev)
}
func (ev sortedEntries) Swap(i, j int) {
ev[i], ev[j] = ev[j], ev[i]
}
func (ev sortedEntries) Less(i, j int) bool {
return ev[i].Delta < ev[j].Delta
}
var Weekdays = []string{
"Di",
"Lu",
"Ma",
"Me",
"Je",
"Ve",
"Sa",
}
func formatDuration(days int) string {
if days > 30 || days < -30 {
return fmt.Sprintf("%+dm", days/30)
} else {
return fmt.Sprintf("%+dj", days)
}
}
func writeHtml(w io.Writer, events []Event) error {
t, err := template.New("html").Parse(PageTemplate)
if err != nil {
return err
}
type Entries struct {
Before []HtmlEntry
After []HtmlEntry
HasAfter bool
}
now := time.Now()
now = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, time.Local)
entries := Entries{}
for _, ev := range events {
startDate := ev.Start
endDate := ev.Start.Add(24 * time.Hour)
if !ev.End.IsZero() {
endDate = ev.End.Add(24 * time.Hour)
}
endDateIn := endDate.Add(-24 * time.Hour)
if !now.Before(endDate) {
continue
}
baseDate := startDate
relDate := baseDate
mult := 1
if startDate.Before(now) {
relDate = endDate
baseDate = endDateIn
mult = -1
}
delta := mult * int(relDate.Sub(now).Hours()/24)
deltaStr := ""
if delta != 0 {
deltaStr = formatDuration(delta)
}
entry := HtmlEntry{
Link: ev.Link,
Start: ev.Start.Format("2006-01-02"),
End: endDateIn.Format("2006-01-02"),
DeltaStr: deltaStr,
Delta: delta,
Title: ev.Title,
Weekday: Weekdays[int(relDate.Weekday())],
}
if !startDate.Before(now) {
entries.After = append(entries.After, entry)
} else {
entries.Before = append(entries.Before, entry)
}
}
sort.Sort(sortedEntries(entries.Before))
sort.Sort(sortedEntries(entries.After))
entries.HasAfter = len(entries.Before) > 0 && len(entries.After) > 0
return t.Execute(w, &entries)
}
func loadEvents(path string) ([]Event, error) {
fp, err := os.Open(path)
if err != nil {
return nil, err
}
defer fp.Close()
events := []Event{}
err = json.NewDecoder(fp).Decode(&events)
return events, err
}
var (
formatCmd = app.Command("format", "write agent events as HTML")
formatJsonArg = formatCmd.Arg("json", "input JSON path").Required().String()
formatPathArg = formatCmd.Arg("path", "output HTML path").Required().String()
)
func formatFn() error {
outPath := *formatPathArg
jsonPath := *formatJsonArg
events, err := loadEvents(jsonPath)
if err != nil {
return err
}
fp, err := os.Create(outPath)
if err != nil {
return err
}
defer fp.Close()
return writeHtml(fp, events)
}
var (
app = kingpin.New("brestagenda", "Crawl and reformat brest.fr agenda")
)
func dispatch() error {
cmd := kingpin.MustParse(app.Parse(os.Args[1:]))
switch cmd {
case crawlCmd.FullCommand():
return crawlFn()
case formatCmd.FullCommand():
return formatFn()
}
return fmt.Errorf("unknown command: %s", cmd)
}
func main() {
err := dispatch()
if err != nil {
fmt.Fprintf(os.Stderr, "error: %s\n", err)
os.Exit(1)
}
}