#12 - update feeds

internal/database/createFeed.sql.go

@@ -22,7 +22,7 @@ VALUES (
         $5,
         $6
        )
-RETURNING id, created_at, updated_at, name, url, user_id
+RETURNING id, created_at, updated_at, name, url, user_id, last_fetched_at
 `
 
 type CreateFeedParams struct {
@@ -51,6 +51,7 @@ func (q *Queries) CreateFeed(ctx context.Context, arg CreateFeedParams) (Feed, e
 		&i.Name,
 		&i.Url,
 		&i.UserID,
+		&i.LastFetchedAt,
 	)
 	return i, err
 }

internal/database/getFeedByUrl.sql.go

@@ -10,7 +10,7 @@ import (
 )
 
 const getFeedByUrl = `-- name: GetFeedByUrl :one
-SELECT id, created_at, updated_at, name, url, user_id FROM feeds WHERE url = $1
+SELECT id, created_at, updated_at, name, url, user_id, last_fetched_at FROM feeds WHERE url = $1
 `
 
 func (q *Queries) GetFeedByUrl(ctx context.Context, url string) (Feed, error) {
@@ -23,6 +23,7 @@ func (q *Queries) GetFeedByUrl(ctx context.Context, url string) (Feed, error) {
 		&i.Name,
 		&i.Url,
 		&i.UserID,
+		&i.LastFetchedAt,
 	)
 	return i, err
 }

internal/database/getNextFeedToFetch.sql.go

@@ -0,0 +1,29 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.28.0
+// source: getNextFeedToFetch.sql
+
+package database
+
+import (
+	"context"
+)
+
+const getNextFeedToFetch = `-- name: GetNextFeedToFetch :one
+SELECT id, created_at, updated_at, name, url, user_id, last_fetched_at FROM feeds ORDER BY last_fetched_at NULLS FIRST LIMIT 1
+`
+
+func (q *Queries) GetNextFeedToFetch(ctx context.Context) (Feed, error) {
+	row := q.db.QueryRowContext(ctx, getNextFeedToFetch)
+	var i Feed
+	err := row.Scan(
+		&i.ID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.Name,
+		&i.Url,
+		&i.UserID,
+		&i.LastFetchedAt,
+	)
+	return i, err
+}

internal/database/markFeeedFetched.sql.go

@@ -0,0 +1,32 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.28.0
+// source: markFeeedFetched.sql
+
+package database
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+const markFeedFetched = `-- name: MarkFeedFetched :one
+UPDATE feeds SET last_fetched_at = CURRENT_TIMESTAMP, updated_at = CURRENT_TIMESTAMP WHERE id = $1
+RETURNING id, created_at, updated_at, name, url, user_id, last_fetched_at
+`
+
+func (q *Queries) MarkFeedFetched(ctx context.Context, id uuid.UUID) (Feed, error) {
+	row := q.db.QueryRowContext(ctx, markFeedFetched, id)
+	var i Feed
+	err := row.Scan(
+		&i.ID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.Name,
+		&i.Url,
+		&i.UserID,
+		&i.LastFetchedAt,
+	)
+	return i, err
+}

internal/database/models.go

@@ -5,18 +5,20 @@
 package database
 
 import (
+	"database/sql"
 	"time"
 
 	"github.com/google/uuid"
 )
 
 type Feed struct {
-	ID        uuid.UUID
-	CreatedAt time.Time
-	UpdatedAt time.Time
-	Name      string
-	Url       string
-	UserID    uuid.UUID
+	ID            uuid.UUID
+	CreatedAt     time.Time
+	UpdatedAt     time.Time
+	Name          string
+	Url           string
+	UserID        uuid.UUID
+	LastFetchedAt sql.NullTime
 }
 
 type FeedFollow struct {

internal/handlers/fetchFeedHandler.go

@@ -1,30 +1,28 @@
 package handlers
 
 import (
-	"context"
-	"fmt"
 	"github.com/rdarius/boot-dev-blog-aggregator/internal/config"
-	"github.com/rdarius/boot-dev-blog-aggregator/internal/rss"
-	"os"
+	"log"
+	"time"
 )
 
 func FetchFeedHandler(s *config.State, cmd config.Command) error {
-	var feedUrl string
 	if len(cmd.Args) < 1 {
-		feedUrl = "https://www.wagslane.dev/index.xml"
-	} else {
-		feedUrl = cmd.Args[0]
+		log.Fatal("usage: boot-dev-blog-aggregator agg time_between_reqs")
 	}
 
-	ctx := context.Background()
-
-	feed, err := rss.FetchFeed(ctx, feedUrl)
+	t, err := time.ParseDuration(cmd.Args[0])
 	if err != nil {
-		fmt.Println("Failed to fetch feed")
-		os.Exit(1)
+		return err
 	}
 
-	fmt.Printf("%v\n", feed)
+	ticker := time.NewTicker(t)
+	for ; ; <-ticker.C {
+		err := ScrapeFeedsHandler(s, cmd)
+		if err != nil {
+			return err
+		}
+	}
 
 	return nil
 }

internal/handlers/scrapeFeedsHandler.go

@@ -0,0 +1,36 @@
+package handlers
+
+import (
+	"context"
+	"fmt"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/config"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/rss"
+)
+
+func ScrapeFeedsHandler(s *config.State, cmd config.Command) error {
+
+	ctx := context.Background()
+
+	nextFeed, err := s.DB.GetNextFeedToFetch(ctx)
+	if err != nil {
+		return err
+	}
+
+	_, err = s.DB.MarkFeedFetched(ctx, nextFeed.ID)
+	if err != nil {
+		return err
+	}
+
+	feedData, err := rss.FetchFeed(ctx, nextFeed.Url)
+	if err != nil {
+		return err
+	}
+
+	fmt.Println("Feed Title: " + feedData.Channel.Title)
+
+	for _, i := range feedData.Channel.Item {
+		fmt.Println("Item Title: " + i.Title)
+	}
+
+	return nil
+}

sql/queries/getNextFeedToFetch.sql

@@ -0,0 +1,2 @@
+-- name: GetNextFeedToFetch :one
+SELECT * FROM feeds ORDER BY last_fetched_at NULLS FIRST LIMIT 1;

sql/queries/markFeeedFetched.sql

@@ -0,0 +1,3 @@
+-- name: MarkFeedFetched :one
+UPDATE feeds SET last_fetched_at = CURRENT_TIMESTAMP, updated_at = CURRENT_TIMESTAMP WHERE id = $1
+RETURNING *;

sql/schema/0004_last_fetched_field_in_feed.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+ALTER TABLE feeds ADD COLUMN last_fetched_at timestamp DEFAULT null;
+
+-- +goose Down
+ALTER TABLE feeds DROP COLUMN last_fetched_at;