func()

in tx.go [576:616]

• 28 lines of code
• 6 McCabe index (conditional complexity)

func (tx *Tx) tryCommitChangesToFile(
	csWAL *walCommitState,
	csAlloc *allocCommitState,
) (metaID int, err reason) {
	newMetaBuf := tx.prepareMetaBuffer()
	newMeta := newMetaBuf.cast()
	newMeta.root.Set(tx.rootID) // update data root

	// 2. allocate new file pages for new meta data to be written
	if err := tx.file.wal.fileCommitAlloc(tx, csWAL); err != nil {
		return metaID, err
	}
	csAlloc.updated = csAlloc.updated || len(csWAL.allocRegions) > 0

	if err := tx.file.allocator.fileCommitAlloc(csAlloc); err != nil {
		return metaID, err
	}

	// 3. serialize page mappings and new freelist
	err = tx.file.wal.fileCommitSerialize(csWAL, uint(tx.PageSize()), tx.scheduleCommitMetaWrite)
	if err != nil {
		return metaID, err
	}

	err = tx.file.allocator.fileCommitSerialize(csAlloc, tx.scheduleCommitMetaWrite)
	if err != nil {
		return metaID, err
	}

	// 4. sync all new contents and metadata before updating the ondisk meta page.
	tx.file.writer.Sync(tx.writeSync, syncDataOnly)

	// 5. finalize on-disk transaction by writing new meta page.
	tx.file.wal.fileCommitMeta(newMeta, csWAL)
	tx.file.allocator.fileCommitMeta(newMeta, csAlloc)
	metaID = tx.syncNewMeta(&newMetaBuf)

	// 6. wait for all pages beeing written and synced,
	//    before updating in memory state.
	return metaID, nil
}