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|
package main
import (
"context"
"database/sql"
"embed"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/99designs/gqlgen/graphql/handler/extension"
"github.com/99designs/gqlgen/graphql/handler/lru"
"github.com/99designs/gqlgen/graphql/handler/transport"
"github.com/hashicorp/go-multierror"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
_ "github.com/mattn/go-sqlite3"
"github.com/mmcdole/gofeed"
"github.com/vektah/gqlparser/v2/ast"
"undef.ninja/x/feedaka/graphql"
)
var (
db *sql.DB
//go:embed static/*
staticFS embed.FS
)
func initDB(db *sql.DB) error {
_, err := db.Exec(`
CREATE TABLE IF NOT EXISTS feeds (
id INTEGER PRIMARY KEY AUTOINCREMENT,
url TEXT NOT NULL,
title TEXT NOT NULL,
fetched_at TEXT NOT NULL
);
CREATE TABLE IF NOT EXISTS articles (
id INTEGER PRIMARY KEY AUTOINCREMENT,
feed_id INTEGER NOT NULL,
guid TEXT NOT NULL,
title TEXT NOT NULL,
url TEXT NOT NULL,
is_read INTEGER NOT NULL
);
`)
return err
}
func fetchOneFeed(feedID int, url string, ctx context.Context) error {
log.Printf("Fetching %s...\n", url)
fp := gofeed.NewParser()
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
feed, err := fp.ParseURLWithContext(url, ctx)
if err != nil {
return fmt.Errorf("Failed to fetch %s: %v\n", url, err)
}
_, err = db.Exec(
`UPDATE feeds SET title = ?, fetched_at = ? WHERE id = ?`,
feed.Title,
time.Now().UTC().Format(time.RFC3339),
feedID,
)
if err != nil {
return err
}
rows, err := db.Query(`SELECT guid FROM articles WHERE feed_id = ?`, feedID)
if err != nil {
return err
}
defer rows.Close()
existingArticleGUIDs := make(map[string]bool)
for rows.Next() {
var guid string
err := rows.Scan(&guid)
if err != nil {
return err
}
existingArticleGUIDs[guid] = true
}
for _, item := range feed.Items {
if existingArticleGUIDs[item.GUID] {
_, err := db.Exec(
`UPDATE articles SET title = ?, url = ? WHERE feed_id = ? AND guid = ?`,
item.Title,
item.Link,
feedID,
item.GUID,
)
if err != nil {
return err
}
} else {
_, err := db.Exec(
`INSERT INTO articles (feed_id, guid, title, url, is_read) VALUES (?, ?, ?, ?, ?)`,
feedID,
item.GUID,
item.Title,
item.Link,
0,
)
if err != nil {
return err
}
}
}
return nil
}
func listFeedsToBeFetched() (map[int]string, error) {
rows, err := db.Query(`SELECT id, url, fetched_at FROM feeds`)
if err != nil {
return nil, err
}
defer rows.Close()
feeds := make(map[int]string)
for rows.Next() {
var feedID int
var url string
var fetchedAt string
err := rows.Scan(&feedID, &url, &fetchedAt)
if err != nil {
log.Fatal(err)
}
fetchedAtTime, err := time.Parse(time.RFC3339, fetchedAt)
if err != nil {
log.Fatal(err)
}
now := time.Now().UTC()
if now.Sub(fetchedAtTime).Minutes() <= 10 {
continue
}
feeds[feedID] = url
}
return feeds, nil
}
func fetchAllFeeds(ctx context.Context) error {
feeds, err := listFeedsToBeFetched()
if err != nil {
return err
}
var result *multierror.Error
for feedID, url := range feeds {
err := fetchOneFeed(feedID, url, ctx)
if err != nil {
result = multierror.Append(result, err)
}
time.Sleep(5 * time.Second)
}
return result.ErrorOrNil()
}
func scheduled(ctx context.Context, d time.Duration, fn func()) {
ticker := time.NewTicker(d)
go func() {
for {
select {
case <-ticker.C:
fn()
case <-ctx.Done():
return
}
}
}()
}
func main() {
port := os.Getenv("FEEDAKA_PORT")
var err error
db, err = sql.Open("sqlite3", "feedaka.db")
if err != nil {
log.Fatal(err)
}
defer db.Close()
err = initDB(db)
if err != nil {
log.Fatal(err)
}
e := echo.New()
e.Use(middleware.Logger())
e.Use(middleware.Recover())
e.Use(middleware.CORS())
e.GET("/static/*", echo.WrapHandler(http.FileServer(http.FS(staticFS))))
// Setup GraphQL server
srv := handler.New(graphql.NewExecutableSchema(graphql.Config{Resolvers: &graphql.Resolver{DB: db}}))
srv.AddTransport(transport.Options{})
srv.AddTransport(transport.GET{})
srv.AddTransport(transport.POST{})
srv.SetQueryCache(lru.New[*ast.QueryDocument](1000))
srv.Use(extension.Introspection{})
srv.Use(extension.AutomaticPersistedQuery{
Cache: lru.New[string](100),
})
// GraphQL endpoints
e.POST("/graphql", echo.WrapHandler(srv))
e.GET("/graphql", echo.WrapHandler(srv))
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
scheduled(ctx, 1*time.Hour, func() {
err := fetchAllFeeds(ctx)
if err != nil {
log.Printf("Failed to fetch feeds: %v\n", err)
}
})
// Setup graceful shutdown
go func() {
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
<-sigChan
log.Println("Shutting down server...")
cancel()
// Give time for graceful shutdown
shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 10*time.Second)
defer shutdownCancel()
if err := e.Shutdown(shutdownCtx); err != nil {
log.Printf("Error during shutdown: %v\n", err)
}
}()
log.Printf("Server starting on port %s...\n", port)
err = e.Start(":" + port)
if err != nil && err != http.ErrServerClosed {
log.Printf("Server error: %v\n", err)
}
log.Println("Server stopped")
}
|
