feat: order items deterministically by local date desc, hoise rss-to-link conv

feed_fetch.go

@@ -22,7 +22,12 @@ func fetchFeed(url string) {
 
 	d := ParseFeed(b)
 
-	b, _ = json.Marshal(d.Channel.ItemsToLinks())
+	links := []Link{}
+
+	for _, feedItem := range d.Channel.Items {
+		links = append(links, Link{Url: feedItem.Link, Title: feedItem.Title, PublishedDate: feedItem.GetPublishedDate()})
+	}
+	b, _ = json.Marshal(links)
 	cacheKey := fmt.Sprintf("feeds:%s", url)
 	SharedCache.Set(cacheKey, string(b))
 }

render_templates.go

@@ -17,6 +17,7 @@ import (
 
 type RenderMeta struct {
 	RenderStart time.Time
+	Location    string
 }
 
 type RenderContext struct {
@@ -51,7 +52,7 @@ func Render(w io.Writer, templateName string, data interface{}) error {
 		return err
 	}
 
-	renderContext := RenderContext{Data: data, Meta: RenderMeta{RenderStart: start}}
+	renderContext := RenderContext{Data: data, Meta: RenderMeta{RenderStart: start, Location: "America/New_York"}}
 
 	return tmpl.ExecuteTemplate(w, "base", renderContext)
 }

routes.go

@@ -5,14 +5,24 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"slices"
+	"time"
 )
 
 type Link struct {
 	Url           string    `json:"url"`
-	PublishedDate string `json:"publishedDate"`
+	PublishedDate time.Time `json:"publishedDate"`
 	Title         string    `json:"title"`
 }
 
+func (l Link) GetLocalizedPublishedDate(loc string) time.Time {
+	if loc == "" {
+		loc = "America/New_York"
+	}
+	location, _ := time.LoadLocation(loc)
+	return l.PublishedDate.In(location)
+}
+
 // Healthcheck route
 //
 // Confirms that the app is alive without guarantees
@@ -39,6 +49,14 @@ func listContent(w http.ResponseWriter, r *http.Request) {
 		links = append(links, formattedItems...)
 	}
 
+	slices.SortStableFunc(links, func(a Link, b Link) int {
+		if a.PublishedDate.After(b.PublishedDate) {
+			return -1
+		}
+
+		return 1
+	})
+
 	Render(w, "index", links)
 }
 

rss.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/xml"
+	"time"
 )
 
 type Document struct {
@@ -12,7 +13,8 @@ type Item struct {
 	Title         string `xml:"title"`
 	Link          string `xml:"link"`
 	Description   string `xml:"description"`
-	PublishedDate string `xml:"pubDate"`
+	PubDate       string `xml:"pubDate"`
+	PublishedDate time.Time
 }
 
 type Channel struct {
@@ -21,14 +23,11 @@ type Channel struct {
 	Items       []Item `xml:"item"`
 }
 
-func (c Channel) ItemsToLinks() []Link {
+const DATE_FORMAT = "Mon, 02 Jan 2006 15:04:05 -0700"
-	formattedItems := []Link{}
 
-	for _, feedItem := range c.Items {
+func (i Item) GetPublishedDate() time.Time {
-		formattedItems = append(formattedItems, Link{Url: feedItem.Link, Title: feedItem.Title, PublishedDate: feedItem.PublishedDate})
+	published, _ := time.Parse(DATE_FORMAT, i.PubDate)
-	}
+	return published
-
-	return formattedItems
 }
 
 func ParseFeed(raw []byte) Document {

templates/index.html.tmpl

@@ -3,7 +3,7 @@
     {{ range .Data }}
         <li>
             <a href="{{ .Url }}">{{ .Title }}</a>
-            <span>{{ .PublishedDate }}</span>
+            <span>{{ .GetLocalizedPublishedDate $.Meta.Location }}</span>
         </li>
     {{ end }}
 </ul>