ckb-network 1.2.0

use crate::{
    errors::{Error, PeerStoreError},
    peer_store::{
        PeerStore,
        addr_manager::AddrManager,
        anchors::Anchors,
        ban_list::BanList,
        types::{AddrInfo, BannedAddr},
    },
};
use ckb_logger::{debug, error};
use p2p::multiaddr::Multiaddr;
use std::path::Path;
use std::{
    fs::{File, OpenOptions, copy, create_dir_all, remove_file, rename},
    io::{Read, Write},
};

const DEFAULT_ADDR_MANAGER_DB: &str = "addr_manager.db";
const DEFAULT_BAN_LIST_DB: &str = "ban_list.db";
const DEFAULT_ANCHORS_DB: &str = "anchors.db";

impl AddrManager {
    /// Load address list from disk
    pub fn load<R: Read>(r: R) -> Result<Self, Error> {
        let addrs: Vec<AddrInfo> = serde_json::from_reader(r).map_err(PeerStoreError::Serde)?;
        let mut addr_manager = AddrManager::default();
        addrs.into_iter().for_each(|addr| addr_manager.add(addr));
        Ok(addr_manager)
    }

    /// Dump address list to disk
    pub fn dump(&self, mut file: File) -> Result<(), Error> {
        let addrs: Vec<_> = self.addrs_iter().collect();
        debug!("Dump {} addrs", addrs.len());
        // empty file and dump the json string to it
        file.set_len(0)
            .and_then(|_| serde_json::to_string(&addrs).map_err(Into::into))
            .and_then(|json_string| file.write_all(json_string.as_bytes()))
            .and_then(|_| file.sync_all())
            .map_err(Into::into)
    }

    #[cfg(target_family = "wasm")]
    pub fn dump_data(&self) -> Vec<u8> {
        let addrs: Vec<_> = self.addrs_iter().collect();
        serde_json::to_string(&addrs).unwrap().into_bytes()
    }
}

impl BanList {
    /// Load ban list from disk
    pub fn load<R: Read>(r: R) -> Result<Self, Error> {
        let banned_addrs: Vec<BannedAddr> =
            serde_json::from_reader(r).map_err(PeerStoreError::Serde)?;
        let mut ban_list = BanList::default();
        banned_addrs
            .into_iter()
            .for_each(|banned_addr| ban_list.ban(banned_addr));
        Ok(ban_list)
    }

    /// Dump ban list to disk
    pub fn dump(&self, mut file: File) -> Result<(), Error> {
        let banned_addrs = self.get_banned_addrs();
        debug!("Dump {} banned addrs", banned_addrs.len());
        // empty file and dump the json string to it
        file.set_len(0)
            .and_then(|_| serde_json::to_string(&banned_addrs).map_err(Into::into))
            .and_then(|json_string| file.write_all(json_string.as_bytes()))
            .and_then(|_| file.sync_all())
            .map_err(Into::into)
    }

    #[cfg(target_family = "wasm")]
    pub fn dump_data(&self) -> Vec<u8> {
        let banned_addrs = self.get_banned_addrs();
        serde_json::to_string(&banned_addrs).unwrap().into_bytes()
    }
}

impl Anchors {
    /// Load address list from disk
    pub fn load<R: Read>(r: R) -> Result<Self, Error> {
        let addrs: Vec<Multiaddr> = serde_json::from_reader(r).map_err(PeerStoreError::Serde)?;
        let mut anchors = Anchors::default();
        addrs.into_iter().for_each(|addr| anchors.add(addr));
        Ok(anchors)
    }

    /// Dump address list to disk
    pub fn dump(&self, mut file: File) -> Result<(), Error> {
        let addrs: Vec<_> = self.dump_iter().collect();
        debug!("Anchors dump {} addrs", addrs.len());
        // empty file and dump the json string to it
        file.set_len(0)
            .and_then(|_| serde_json::to_string(&addrs).map_err(Into::into))
            .and_then(|json_string| file.write_all(json_string.as_bytes()))
            .and_then(|_| file.sync_all())
            .map_err(Into::into)
    }

    #[cfg(target_family = "wasm")]
    pub fn dump_data(&self) -> Vec<u8> {
        let addrs: Vec<_> = self.dump_iter().collect();
        serde_json::to_string(&addrs).unwrap().into_bytes()
    }
}

impl PeerStore {
    /// Init peer store from disk
    pub fn load_from_dir_or_default<P: AsRef<Path>>(path: P) -> Self {
        let addr_manager_path = path.as_ref().join(DEFAULT_ADDR_MANAGER_DB);
        let ban_list_path = path.as_ref().join(DEFAULT_BAN_LIST_DB);
        let anchors_path = path.as_ref().join(DEFAULT_ANCHORS_DB);

        let addr_manager = open_read(&addr_manager_path)
            .map_err(|err| {
                debug!(
                    "Failed to open AddrManager db, file: {:?}, error: {:?}",
                    addr_manager_path, err
                )
            })
            .and_then(|reader| {
                AddrManager::load(reader).map_err(|err| {
                    error!(
                        "Failed to load AddrManager db, file: {:?}, error: {:?}",
                        addr_manager_path, err
                    );
                })
            })
            .unwrap_or_default();

        let ban_list = open_read(&ban_list_path)
            .map_err(|err| {
                debug!(
                    "Failed to open BanList db, file: {:?}, error: {:?}",
                    ban_list_path, err
                )
            })
            .and_then(|reader| {
                BanList::load(reader).map_err(|err| {
                    error!(
                        "Failed to load BanList db, file: {:?}, error: {:?}",
                        ban_list_path, err
                    )
                })
            })
            .unwrap_or_default();

        let anchors = open_read(&anchors_path)
            .map_err(|err| {
                debug!(
                    "Failed to open Anchors db, file: {:?}, error: {:?}",
                    anchors_path, err
                )
            })
            .and_then(|reader| {
                Anchors::load(reader).map_err(|err| {
                    error!(
                        "Failed to load Anchors db, file: {:?}, error: {:?}",
                        anchors_path, err
                    )
                })
            })
            .unwrap_or_default();

        PeerStore::new(addr_manager, ban_list, anchors)
    }

    #[cfg(target_family = "wasm")]
    pub async fn load_from_idb<P: AsRef<Path>>(path: P) -> Self {
        use crate::peer_store::browser::get_db;

        let addr_manager_path = path
            .as_ref()
            .join(DEFAULT_ADDR_MANAGER_DB)
            .to_str()
            .unwrap()
            .to_owned()
            .into_bytes();
        let ban_list_path = path
            .as_ref()
            .join(DEFAULT_BAN_LIST_DB)
            .to_str()
            .unwrap()
            .to_owned()
            .into_bytes();
        let anchors_path = path
            .as_ref()
            .join(DEFAULT_ANCHORS_DB)
            .to_str()
            .unwrap()
            .to_owned()
            .into_bytes();

        let db = get_db(path).await;

        let addr_manager = db
            .get(&addr_manager_path)
            .await
            .map_err(|err| debug!("Failed to get indexdb value, error: {:?}", err))
            .and_then(|data| {
                AddrManager::load(std::io::Cursor::new(data.unwrap_or_default()))
                    .map_err(|err| debug!("Failed to load peer store value, error: {:?}", err))
            })
            .unwrap_or_default();

        let ban_list = db
            .get(&ban_list_path)
            .await
            .map_err(|err| debug!("Failed to get indexdb value, error: {:?}", err))
            .and_then(|data| {
                BanList::load(std::io::Cursor::new(data.unwrap_or_default()))
                    .map_err(|err| debug!("Failed to load BanList value, error: {:?}", err))
            })
            .unwrap_or_default();

        let anchors = db
            .get(&anchors_path)
            .await
            .map_err(|err| debug!("Failed to get indexdb value, error: {:?}", err))
            .and_then(|data| {
                Anchors::load(std::io::Cursor::new(data.unwrap_or_default()))
                    .map_err(|err| debug!("Failed to load Anchors value, error: {:?}", err))
            })
            .unwrap_or_default();

        PeerStore::new(addr_manager, ban_list, anchors)
    }

    /// Dump all info to disk
    pub fn dump_to_dir<P: AsRef<Path>>(&self, path: P) -> Result<(), Error> {
        // create dir
        create_dir_all(&path)?;
        // dump file to a temporary sub-directory
        let tmp_dir = path.as_ref().join("tmp");
        create_dir_all(&tmp_dir)?;
        let tmp_addr_manager = tmp_dir.join(DEFAULT_ADDR_MANAGER_DB);
        let tmp_ban_list = tmp_dir.join(DEFAULT_BAN_LIST_DB);
        let tmp_anchors_list = tmp_dir.join(DEFAULT_ANCHORS_DB);
        self.addr_manager().dump(dump_open(&tmp_addr_manager)?)?;
        move_file(
            tmp_addr_manager,
            path.as_ref().join(DEFAULT_ADDR_MANAGER_DB),
        )?;
        self.ban_list().dump(dump_open(&tmp_ban_list)?)?;
        move_file(tmp_ban_list, path.as_ref().join(DEFAULT_BAN_LIST_DB))?;
        self.anchors().dump(dump_open(&tmp_anchors_list)?)?;
        move_file(tmp_anchors_list, path.as_ref().join(DEFAULT_ANCHORS_DB))?;
        Ok(())
    }

    #[cfg(target_family = "wasm")]
    pub fn dump_to_idb<P: AsRef<Path>>(
        &self,
        path: P,
    ) -> impl std::future::Future<Output = ()> + use<P> {
        use crate::peer_store::browser::get_db;
        let ban_list = self.ban_list().dump_data();
        let addr_manager = self.addr_manager().dump_data();
        let anchors = self.anchors().dump_data();

        let addr_manager_path = path
            .as_ref()
            .join(DEFAULT_ADDR_MANAGER_DB)
            .to_str()
            .unwrap()
            .to_owned();
        let ban_list_path = path
            .as_ref()
            .join(DEFAULT_BAN_LIST_DB)
            .to_str()
            .unwrap()
            .to_owned();
        let anchors_path = path
            .as_ref()
            .join(DEFAULT_ANCHORS_DB)
            .to_str()
            .unwrap()
            .to_owned();
        async {
            let db = get_db(path).await;

            let _ignore = db.put(addr_manager_path.into_bytes(), addr_manager).await;
            let _ignore = db.put(ban_list_path.into_bytes(), ban_list).await;
            let _ignore = db.put(anchors_path.into_bytes(), anchors).await;
        }
    }
}

/// This function use `copy` then `remove_file` as a fallback when `rename` failed,
/// this maybe happen when src and dst on different file systems.
fn move_file<P: AsRef<Path>>(src: P, dst: P) -> Result<(), Error> {
    if rename(&src, &dst).is_err() {
        copy(&src, &dst)?;
        remove_file(&src)?;
    }
    Ok(())
}

fn open_read<P: AsRef<Path>>(path: P) -> std::io::Result<std::io::BufReader<File>> {
    File::open(path.as_ref()).map(std::io::BufReader::new)
}

fn dump_open<P: AsRef<Path>>(path: P) -> std::io::Result<File> {
    OpenOptions::new()
        .write(true)
        .create(true)
        .truncate(true)
        .append(false)
        .open(path.as_ref())
}