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
|
package feed
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"time"
"github.com/mmcdole/gofeed"
"undef.ninja/x/feedaka/db"
)
// FetchResult holds the result of fetching a feed, including the resolved URL.
type FetchResult struct {
Feed *gofeed.Feed
URL string
}
func Fetch(ctx context.Context, rawURL string) (*FetchResult, error) {
fp := gofeed.NewParser()
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
f, err := fp.ParseURLWithContext(rawURL, ctx)
if err == nil {
return &FetchResult{Feed: f, URL: rawURL}, nil
}
if !errors.Is(err, gofeed.ErrFeedTypeNotDetected) {
return nil, fmt.Errorf("failed to fetch %s: %w", rawURL, err)
}
discoveredURL, discoverErr := discoverFeedURL(ctx, rawURL)
if discoverErr != nil {
return nil, fmt.Errorf("failed to fetch %s: not a feed and auto-discovery failed: %w", rawURL, discoverErr)
}
f, err = fp.ParseURLWithContext(discoveredURL, ctx)
if err != nil {
return nil, fmt.Errorf("failed to fetch discovered feed %s: %w", discoveredURL, err)
}
return &FetchResult{Feed: f, URL: discoveredURL}, nil
}
func discoverFeedURL(ctx context.Context, rawURL string) (string, error) {
req, err := http.NewRequestWithContext(ctx, "GET", rawURL, nil)
if err != nil {
return "", err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return "", fmt.Errorf("HTTP %d", resp.StatusCode)
}
base, err := url.Parse(rawURL)
if err != nil {
return "", err
}
links := discoverFeeds(resp.Body, base)
feedURL := selectFeed(links)
if feedURL == "" {
return "", fmt.Errorf("no feed links found in HTML")
}
return feedURL, nil
}
// Sync upserts the parsed feed's items into the database and returns the
// number of newly inserted articles. The caller uses that count to drive the
// adaptive fetch interval.
func Sync(ctx context.Context, queries *db.Queries, feedID int64, f *gofeed.Feed) (int, error) {
err := queries.UpdateFeedMetadata(ctx, db.UpdateFeedMetadataParams{
Title: f.Title,
FetchedAt: time.Now().UTC().Format(time.RFC3339),
ID: feedID,
})
if err != nil {
return 0, err
}
guids, err := queries.GetArticleGUIDsByFeed(ctx, feedID)
if err != nil {
return 0, err
}
existingFeedGUIDs := make(map[string]bool, len(guids))
for _, guid := range guids {
existingFeedGUIDs[guid] = true
}
newCount := 0
for _, item := range f.Items {
if existingFeedGUIDs[item.GUID] {
err := queries.UpdateArticle(ctx, db.UpdateArticleParams{
Title: item.Title,
Url: item.Link,
FeedID: feedID,
Guid: item.GUID,
})
if err != nil {
return newCount, err
}
} else {
exists, err := queries.CheckArticleExistsByGUID(ctx, item.GUID)
if err != nil {
return newCount, err
}
if exists == 1 {
continue
}
_, err = queries.CreateArticle(ctx, db.CreateArticleParams{
FeedID: feedID,
Guid: item.GUID,
Title: item.Title,
Url: item.Link,
IsRead: 0,
})
if err != nil {
return newCount, err
}
newCount++
}
}
return newCount, nil
}
|
