/
rss.go
174 lines (139 loc) · 3.67 KB
/
rss.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
// Package rss -
package rss
import (
"errors"
"log/slog"
"reflect"
"github.com/mmcdole/gofeed"
)
var ErrNoStore = errors.New("no store supplied cannot continue")
var ErrNoURL = errors.New("no urls supplied cannot continue")
// watched structure for handle parsing of RSS/Atom feeds.
type watched struct {
Feeds []feedData
Store Storage
}
type feedData struct {
URL string
Feed *gofeed.Feed
}
// check that the concrete instance passed in as a Storage is not nil.
func isNilFixed(instance Storage) bool {
if instance == nil {
return true
}
switch reflect.TypeOf(instance).Kind() {
case reflect.Ptr, reflect.Map, reflect.Array, reflect.Chan, reflect.Slice:
return reflect.ValueOf(instance).IsNil()
}
return false
}
// NewWatched - create a new watched instance.
func NewWatched(store Storage, urls ...string) (*watched, error) {
if isNilFixed(store) {
return nil, ErrNoStore
}
if len(urls) < 1 {
return nil, ErrNoURL
}
newWatched := &watched{Store: store}
for _, u := range urls {
newWatched.Feeds = append(newWatched.Feeds, struct {
URL string
Feed *gofeed.Feed
}{URL: u})
}
return newWatched, nil
}
func (w *watched) GetReleases(c chan map[string]string) {
w.GetUnseenReleases(c)
}
// GetUnseenReleases - get previously unseen releases.
func (w *watched) GetUnseenReleases(unseen chan map[string]string) {
slog.Debug("Getting unseen")
//nolint:gomnd
// The buffer length is arbirtrary.
feeds := make(chan feedData, 10)
go w.update(feeds)
for feed := range feeds {
if feed.Feed == nil {
continue
}
slog.Debug("Feed", "value", feed.URL)
slog.Debug("Feed Item", "value", feed.Feed.Items)
for idx := range feed.Feed.Items {
title := feed.Feed.Items[idx].Title
seen, err := w.Store.CheckExists(feed.URL, title)
if err != nil {
slog.Warn("unable to check %q with error %v", title, err)
continue
}
if !seen {
content := feed.Feed.Items[idx].Content
link := feed.Feed.Items[idx].Link
if err := w.Store.CreateItem(feed.URL, title, content, link); err != nil {
slog.Warn("unable to create %q with error %v", title, err)
continue
}
unseen <- map[string]string{"title": title, "content": content, "link": link}
}
}
}
slog.Debug("Unseen count", "value", len(unseen))
close(unseen)
}
// Update - fetch all items for all feeds.
func (w *watched) update(feeds chan feedData) {
slog.Debug("Fetching items for feeds")
fp := gofeed.NewParser()
for idx := range w.Feeds {
slog.Debug("URL", "value", w.Feeds[idx].URL)
url := w.Feeds[idx].URL
feed, err := fp.ParseURL(url)
if err != nil {
continue
}
feeds <- feedData{URL: url, Feed: feed}
}
close(feeds)
}
//nolint:lll
// FetchURL fetches the feed URL and also fakes the user-agent to be able
// to retrieve data from sites like reddit.
// func (w *watched) fetchURL(fp *gofeed.Parser, url string) (feed *gofeed.Feed, err error) {
// slog.Debug("fetching URL", "value", url)
//
// client := &http.Client{}
//
// slog.Debug("Preparing request")
//
// req, err := http.NewRequest("GET", url, nil)
// if err != nil {
// return nil, err
// }
//
// req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36")
//
// slog.Debug("Making Request")
//
// resp, err := client.Do(req)
// if err != nil {
// return nil, err
// }
//
// if resp != nil {
// defer func() {
// ce := resp.Body.Close()
// if ce != nil {
// err = ce
// }
// }()
// }
//
// if resp.StatusCode < 200 || resp.StatusCode >= 300 {
// return nil, fmt.Errorf("failed to get url %v, %v", resp.StatusCode, resp.Status)
// }
//
// slog.Debug("returning body")
// return fp.Parse(resp.Body)
//}