commit 54640ca00f76c1b4298c39a494603a3468c916b3
from: Oliver Lowe <o@olowe.co>
date: Tue Apr 29 23:45:16 2025 UTC

internal/db: return error on channel not found

Defining a new error as I imagine we'll be wanting to handle this
explicitly e.g. by trying to look up a feed on the web.

commit - 4b027dd5ebf86a899817b235cb999dc9cd37f2a8
commit + 54640ca00f76c1b4298c39a494603a3468c916b3
blob - e13d3e5bec8d3e544e132b865037605b3202a231
blob + d703d35406a6ac437561fcde96b4bc3023beb867
--- internal/db/channels.go
+++ internal/db/channels.go
@@ -2,6 +2,7 @@ package db
 
 import (
 	"encoding/json"
+	"errors"
 
 	"github.com/streatCodes/rss/rss"
 	bolt "go.etcd.io/bbolt"
@@ -27,12 +28,17 @@ func (db *DB) SaveChannel(url string, channel *rss.Cha
 	return err
 }
 
+var ErrNotExist = errors.New("channel does not exist")
+
 func (db *DB) GetChannel(url string) (*rss.Channel, error) {
 	var channelBytes []byte
 	err := db.raw.View(func(tx *bolt.Tx) error {
 		if bucket := tx.Bucket(channelsBucket); bucket != nil {
 			channelBytes = bucket.Get([]byte(url))
 		}
+		if len(channelBytes) == 0 {
+			return ErrNotExist
+		}
 		return nil
 	})