You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: replication_logger_wal.rs
    path of file: ./repos/libsql/libsql-server/src/replication/primary
    
    the code of the file until where you have to start completion: use std::ffi::{c_int, CStr};
use std::num::NonZeroU32;
use std::sync::Arc;

use bytes::Bytes;
use libsql_sys::ffi::Sqlite3DbHeader;
use libsql_sys::wal::{
    BusyHandler, CheckpointCallback, Result, Sqlite3Wal, Sqlite3WalManager, WalManager,
};
use libsql_sys::wal::{PageHeaders, Sqlite3Db, Sqlite3File, UndoHandler};
use libsql_sys::wal::{Vfs, Wal};
use rusqlite::ffi::{SQLITE_IOERR, SQLITE_SYNC_NORMAL};
use zerocopy::FromBytes;

use crate::replication::ReplicationLogger;
use crate::LIBSQL_PAGE_SIZE;

use super::l
    
    fn inject_replication_index(&mut self, db: &mut Sqlite3Db) -> Result<()> {
        let data = &mut [0; LIBSQL_PAGE_SIZE as _];
        // We retreive the freshest version of page 1. Either most recent page 1 is in the WAL, or
        // it is in the main db file
        match self.find_frame(NonZeroU32::new(1).unwrap())? {
            Some(fno) => {
                self.read_frame(fno, data)?;
            }
            None => {
                self.inner.db_file().read_at(data, 0)?;
            }
        }

        let header = Sqlite3DbHeader::mut_from_prefix(data).expect("invalid database header");
        header.replication_index =
            (self.logger().new_frame_notifier.borrow().unwrap_or(0) + 1).into();

        let mut header = libsql_sys::connection::pghdr_creator(data, db.as_ptr());

        let mut headers = unsafe { PageHeaders::from_raw(&mut header) };

        // to retrieve the database size, you must be within a read transaction
        self.begin_read_txn()?;
        let db_size = self.db_size();
        self.end_read_txn();

        self.begin_write_txn()?;
        self.insert_frames(
            LIBSQL_PAGE_SIZE as _,
            &mut headers,
            db_size, // the database doesn't change; there's always a page 1.
            true,
            SQLITE_SYNC_NORMAL, // we'll checkpoint right after, no need for full sync
        )?;
        self.end_write_txn()?;

        Ok(())
    }