func main() {
db, err := postgres.Open("", "")
if err != nil {
log.Fatal(err)
}
m := migrate.NewMigrations()
m.Add(1, "CREATE SEQUENCE hits")
if err := m.Migrate(db.DB); err != nil {
log.Fatal(err)
}
stmt, err := db.Prepare("SELECT nextval(hits)")
if err != nil {
log.Fatal(err)
}
port := os.Getenv("PORT")
http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
var count int
if err := stmt.QueryRow().Scan(&count); err != nil {
w.WriteHeader(500)
w.Write([]byte(err.Error()))
return
}
fmt.Fprintf(w, "Hello from Go on Flynn: port=%s hits=%d", port, count)
})
fmt.Println("hitcounter listening on port", port)
log.Fatal(http.ListenAndServe(":"+port, nil))
}
func NewPostgresFilesystem(db *sql.DB) (Filesystem, error) {
m := migrate.NewMigrations()
m.Add(1,
`CREATE TABLE files (
file_id oid PRIMARY KEY DEFAULT lo_create(0),
name text UNIQUE NOT NULL,
size bigint,
type text,
digest text,
created_at timestamp with time zone NOT NULL DEFAULT current_timestamp
);`,
`CREATE FUNCTION delete_file() RETURNS TRIGGER AS $$
BEGIN
PERFORM lo_unlink(OLD.file_id);
RETURN NULL;
END;
$$ LANGUAGE plpgsql;`,
`CREATE TRIGGER delete_file
AFTER DELETE ON files
FOR EACH ROW EXECUTE PROCEDURE delete_file();`,
)
return &PostgresFilesystem{db: db}, m.Migrate(db)
}