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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2021 Jason A. Donenfeld. All Rights Reserved.
*/
package main
import (
"container/list"
"encoding/hex"
"encoding/xml"
"io"
"log"
"net/http"
"path"
"sync"
"time"
)
type CgitCommit struct {
Text string `xml:",chardata"`
Title string `xml:"title"`
Updated string `xml:"updated"`
Author struct {
Text string `xml:",chardata"`
Name string `xml:"name"`
Email string `xml:"email"`
} `xml:"author"`
Published string `xml:"published"`
Link struct {
Text string `xml:",chardata"`
Rel string `xml:"rel,attr"`
Type string `xml:"type,attr"`
Href string `xml:"href,attr"`
} `xml:"link"`
ID string `xml:"id"`
Content []struct {
Text string `xml:",chardata"`
Type string `xml:"type,attr"`
Div struct {
Text string `xml:",chardata"`
Xmlns string `xml:"xmlns,attr"`
Pre string `xml:"pre"`
} `xml:"div"`
} `xml:"content"`
}
type cgitFeed struct {
XMLName xml.Name `xml:"feed"`
Text string `xml:",chardata"`
Xmlns string `xml:"xmlns,attr"`
Title string `xml:"title"`
Subtitle string `xml:"subtitle"`
Link struct {
Text string `xml:",chardata"`
Rel string `xml:"rel,attr"`
Type string `xml:"type,attr"`
Href string `xml:"href,attr"`
} `xml:"link"`
Entry []CgitCommit `xml:"entry"`
}
type cgitFeedStatus struct {
repo string
title string
seenEntries map[[32]byte]bool
orderedEntries list.List
}
type CgitFeedMonitorer struct {
feeds []*cgitFeedStatus
updates chan CgitFeedUpdate
ticker *time.Ticker
wg sync.WaitGroup
mu sync.Mutex
}
type CgitFeedUpdate struct {
RepoTitle string
Commit *CgitCommit
}
func NewCgitFeedMonitorer(pollInterval time.Duration) *CgitFeedMonitorer {
fm := &CgitFeedMonitorer{
updates: make(chan CgitFeedUpdate, 32),
ticker: time.NewTicker(pollInterval),
}
fm.wg.Add(1)
go func() {
defer fm.wg.Done()
for range fm.ticker.C {
fm.mu.Lock()
for _, feed := range fm.feeds {
fm.wg.Add(1)
go func(feed *cgitFeedStatus) {
defer fm.wg.Done()
fm.updateFeed(feed, true)
}(feed)
}
fm.mu.Unlock()
}
}()
return fm
}
func (fm *CgitFeedMonitorer) Stop() {
fm.ticker.Stop()
fm.wg.Wait()
close(fm.updates)
}
func (fm *CgitFeedMonitorer) Updates() <-chan CgitFeedUpdate {
return fm.updates
}
func (fm *CgitFeedMonitorer) AddFeed(repo string) {
go func() {
status := &cgitFeedStatus{
repo: repo,
title: path.Base(repo),
seenEntries: make(map[[32]byte]bool, 1024),
}
fm.updateFeed(status, false)
fm.mu.Lock()
fm.feeds = append(fm.feeds, status)
fm.mu.Unlock()
}()
}
func (fm *CgitFeedMonitorer) updateFeed(fs *cgitFeedStatus, alert bool) {
feed, err := fs.fetchFeed()
if err != nil {
log.Printf("Unable to fetch commits for %q: %v", fs.title, err)
return
}
for i := len(feed.Entry) - 1; i >= 0; i-- {
commit := &feed.Entry[i]
var commitID [32]byte
if hex.DecodedLen(len(commit.ID)) > len(commitID) {
continue
}
n, err := hex.Decode(commitID[:], []byte(commit.ID))
if err != nil || n < 20 {
continue
}
if _, ok := fs.seenEntries[commitID]; ok {
continue
}
fs.seenEntries[commitID] = true
fs.orderedEntries.PushBack(commitID)
for len(fs.seenEntries) > 1024 {
first := fs.orderedEntries.Front()
delete(fs.seenEntries, first.Value.([32]byte))
fs.orderedEntries.Remove(first)
}
if alert {
fm.updates <- CgitFeedUpdate{fs.title, commit}
}
}
}
func (fs *cgitFeedStatus) fetchFeed() (*cgitFeed, error) {
resp, err := http.Get(fs.repo + "/atom/")
if err != nil {
return nil, err
}
bytes, err := io.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return nil, err
}
var feed cgitFeed
err = xml.Unmarshal(bytes, &feed)
if err != nil {
return nil, err
}
return &feed, nil
}
|
