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package sqlite
import (
"database/sql"
"fmt"
"hash/fnv"
"mime"
"path/filepath"
"time"
"go.alanpearce.eu/website/internal/buffer"
"go.alanpearce.eu/website/internal/storage"
"go.alanpearce.eu/x/log"
"gitlab.com/tozd/go/errors"
_ "modernc.org/sqlite"
)
type Writer struct {
db *sql.DB
options *Options
log *log.Logger
queries struct {
insertURL *sql.Stmt
insertFile *sql.Stmt
insertContent *sql.Stmt
}
}
type Options struct {
Compress bool
}
func openDB(dbPath string) (*sql.DB, error) {
return sql.Open(
"sqlite",
fmt.Sprintf(
"file:%s?mode=%s&_pragma=foreign_keys(1)&_pragma=mmap_size(%d)",
dbPath,
"rwc",
16*1024*1024,
),
)
}
func NewWriter(dbPath string, logger *log.Logger, opts *Options) (*Writer, error) {
db, err := openDB(dbPath)
if err != nil {
return nil, errors.WithMessage(err, "opening sqlite database")
}
// WIP: only memory database for now
_, err = db.Exec(`
CREATE TABLE IF NOT EXISTS url (
id INTEGER PRIMARY KEY,
path TEXT NOT NULL
);
CREATE UNIQUE INDEX IF NOT EXISTS url_path
ON url (path);
CREATE TABLE IF NOT EXISTS file (
id INTEGER PRIMARY KEY,
url_id INTEGER NOT NULL,
content_type TEXT NOT NULL,
last_modified INTEGER NOT NULL,
etag TEXT NOT NULL,
FOREIGN KEY (url_id) REFERENCES url (id)
);
CREATE UNIQUE INDEX IF NOT EXISTS file_url_content_type
ON file (url_id, content_type);
CREATE TABLE IF NOT EXISTS content (
file_id INTEGER NOT NULL,
encoding TEXT NOT NULL,
body BLOB NOT NULL,
FOREIGN KEY (file_id) REFERENCES file (id)
);
CREATE UNIQUE INDEX IF NOT EXISTS file_content
ON content (file_id, encoding);
CREATE TABLE IF NOT EXISTS redirect (
id INTEGER PRIMARY KEY,
url_id INTEGER NOT NULL,
permanent BOOLEAN NOT NULL,
expires INTEGER,
FOREIGN KEY (url_id) REFERENCES url (id)
);
`)
if err != nil {
return nil, errors.WithMessage(err, "creating tables")
}
w := &Writer{
db: db,
log: logger,
options: opts,
}
w.queries.insertURL, err = db.Prepare(`INSERT INTO url (path) VALUES (?)`)
if err != nil {
return nil, errors.WithMessage(err, "preparing insert URL statement")
}
w.queries.insertFile, err = db.Prepare(`
INSERT INTO file (url_id, content_type, last_modified, etag)
VALUES (:url_id, :content_type, :last_modified, :etag)
`)
if err != nil {
return nil, errors.WithMessage(err, "preparing insert file statement")
}
w.queries.insertContent, err = db.Prepare(`
INSERT INTO content (file_id, encoding, body)
VALUES (:file_id, :encoding, :body)
`)
if err != nil {
return nil, errors.WithMessage(err, "preparing insert content statement")
}
return w, nil
}
func (s *Writer) Mkdirp(path string) error {
return nil
}
func (s *Writer) storeURL(path string) (int64, error) {
r, err := s.queries.insertURL.Exec(path)
if err != nil {
return 0, errors.WithMessage(err, "inserting URL into database")
}
return r.LastInsertId()
}
func (s *Writer) storeFile(urlID int64, file *storage.File) (int64, error) {
r, err := s.queries.insertFile.Exec(
sql.Named("url_id", urlID),
sql.Named("content_type", file.ContentType),
sql.Named("last_modified", file.LastModified.Unix()),
sql.Named("etag", file.Etag),
)
if err != nil {
return 0, errors.WithMessage(err, "inserting file into database")
}
return r.LastInsertId()
}
func (s *Writer) storeEncoding(fileID int64, encoding string, data []byte) error {
_, err := s.queries.insertContent.Exec(
sql.Named("file_id", fileID),
sql.Named("encoding", encoding),
sql.Named("body", data),
)
if err != nil {
return errors.WithMessage(err, "inserting encoding into database")
}
return nil
}
func etag(content []byte) (string, error) {
hash := fnv.New64a()
hash.Write(content)
return fmt.Sprintf(`W/"%x"`, hash.Sum(nil)), nil
}
func contentType(pathname string) string {
return mime.TypeByExtension(filepath.Ext(pathNameToFileName(pathname)))
}
func (s *Writer) Write(pathname string, content *buffer.Buffer) error {
s.log.Debug("storing content", "pathname", pathname)
bytes := content.Bytes()
urlID, err := s.storeURL(pathname)
if err != nil {
return errors.WithMessage(err, "storing URL")
}
etag, err := etag(bytes)
if err != nil {
return errors.WithMessage(err, "calculating etag")
}
file := &storage.File{
Path: pathname,
ContentType: contentType(pathname),
LastModified: time.Now(),
Etag: etag,
}
fileID, err := s.storeFile(urlID, file)
if err != nil {
return errors.WithMessage(err, "storing file")
}
err = s.storeEncoding(fileID, "identity", bytes)
if err != nil {
return errors.WithMessagef(
err,
"storing encoding file_id: %d, encoding: %s",
fileID,
"identity",
)
}
return nil
}
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