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feed_source.go
94 lines (78 loc) · 2.01 KB
/
feed_source.go
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package murmur
import (
"fmt"
"sort"
"strings"
"time"
retryablehttp "github.com/hashicorp/go-retryablehttp"
"github.com/mmcdole/gofeed"
)
type FeedSourceConfig struct {
Url string `yaml:"url"`
Template string `yaml:"template"`
}
type FeedSource struct {
config *FeedSourceConfig
}
func (c *FeedSourceConfig) NewSource() (Source, error) {
return &FeedSource{
config: c,
}, nil
}
type discardLogger struct{}
func (l *discardLogger) Printf(string, ...interface{}) {}
func (s *FeedSource) Items() ([]*Item, error) {
client := retryablehttp.NewClient()
client.HTTPClient.Timeout = 10 * time.Second
client.RetryMax = 1
client.Logger = &discardLogger{}
resp, err := client.Get(s.config.Url)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
defer resp.Body.Close()
fp := gofeed.NewParser()
feed, err := fp.Parse(resp.Body)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
return s.itemsFromFeed(feed)
}
func (s *FeedSource) itemsFromFeed(feed *gofeed.Feed) ([]*Item, error) {
t := time.Now().AddDate(0, 0, -1)
items := make([]*gofeed.Item, 0, len(feed.Items))
for _, item := range feed.Items {
if item.PublishedParsed != nil {
if !item.PublishedParsed.After(t) {
continue
}
} else if item.UpdatedParsed != nil {
if !item.UpdatedParsed.After(t) {
continue
}
}
if item.Link == "" {
continue
}
items = append(items, item)
}
sort.Slice(items, func(i, j int) bool {
if items[i].PublishedParsed != nil && items[j].PublishedParsed != nil {
return items[i].PublishedParsed.Before(*items[i].PublishedParsed)
}
if items[i].UpdatedParsed != nil && items[j].UpdatedParsed != nil {
return items[i].UpdatedParsed.Before(*items[i].UpdatedParsed)
}
return i > j
})
result := make([]*Item, 0, len(items))
for _, item := range items {
replacer := strings.NewReplacer("{title}", item.Title, "{url}", item.Link)
summary := replacer.Replace(s.config.Template)
result = append(result, &Item{
Summary: summary,
Url: item.Link,
})
}
return result, nil
}