Xuanwo commented on code in PR #2735: URL: https://github.com/apache/incubator-opendal/pull/2735#discussion_r1305025626
########## core/src/services/zookeeper/backend.rs: ########## @@ -0,0 +1,305 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::HashMap; +use zookeeper_client as zk; + +use crate::raw::adapters::kv; +use crate::Scheme; +use async_trait::async_trait; +use tokio::sync::OnceCell; + +use crate::Builder; +use crate::Error; +use crate::ErrorKind; +use crate::*; + +use std::fmt::Debug; +use std::fmt::Formatter; +use std::io; + +use futures::future::{BoxFuture, FutureExt}; +use substring::Substring; + +use log::warn; + +const DEFAULT_ZOOKEEPER_ENDPOINT: &str = "127.0.0.1:2181"; +/// The scheme for zookeeper authentication +/// currently we do not support sasl authentication +const ZOOKEEPER_AUTH_SCHEME: &str = "digest"; + +/// Zookeeper backend builder +#[derive(Clone, Default)] +pub struct ZookeeperBuilder { + /// network address of the Zookeeper service + /// Default: 127.0.0.1:2181 + endpoint: Option<String>, + /// the user to connect to zookeeper service, default None + user: Option<String>, + /// the path to the password file of the user to connect to zookeeper service, default None + digest_path: Option<String>, +} + +impl ZookeeperBuilder { + /// Set the network addresses of zookeeper service + pub fn endpoint(&mut self, endpoint: &str) -> &mut Self { + if !endpoint.is_empty() { + self.endpoint = Some(endpoint.to_string()); + } + self + } + + /// Set the username of zookeeper service + pub fn user(&mut self, user: &str) -> &mut Self { + if !user.is_empty() { + self.user = Some(user.to_string()); + } + self + } + + /// Specify the auth digest path of zookeeper service + pub fn digest_path(&mut self, digest_path: &str) -> &mut Self { + if !digest_path.is_empty() { + self.digest_path = Some(digest_path.to_string()); + } + self + } +} + +impl Debug for ZookeeperBuilder { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Builder"); + if let Some(endpoint) = self.endpoint.clone() { + ds.field("endpoint", &endpoint); + } + if let Some(user) = self.user.clone() { + ds.field("user", &user); + } + if let Some(digest_path) = self.digest_path.clone() { + ds.field("digest_path", &digest_path); + } + ds.finish() + } +} + +impl Builder for ZookeeperBuilder { + const SCHEME: Scheme = Scheme::Zookeeper; + type Accessor = ZookeeperBackend; + + fn from_map(map: HashMap<String, String>) -> Self { + let mut builder = ZookeeperBuilder::default(); + + map.get("endpoint").map(|v| builder.endpoint(v)); + map.get("user").map(|v| builder.user(v)); + map.get("digest_path").map(|v| builder.digest_path(v)); + + builder + } + + fn build(&mut self) -> Result<Self::Accessor> { + let endpoint = match self.endpoint.clone() { + None => DEFAULT_ZOOKEEPER_ENDPOINT.to_string(), + Some(endpoint) => endpoint, + }; + let (auth, acl) = match (self.user.clone(), self.digest_path.clone()) { + (Some(user), Some(digest_path)) => { + let password = std::fs::read(digest_path).map_err(parse_file_error)?; + let auth = [format!("{user}:").as_bytes().to_vec(), password].concat(); + (auth, zk::Acl::creator_all()) + } + _ => { + // TODO: change to warn + warn!("username and password isn't set, default use `anyone` acl"); + (Vec::<u8>::new(), zk::Acl::anyone_all()) + } + }; + + Ok(ZookeeperBackend::new(ZkAdapter { + endpoint, + auth, + acl, + client: OnceCell::new(), + })) + } +} + +/// Backend for Zookeeper service +pub type ZookeeperBackend = kv::Backend<ZkAdapter>; + +#[derive(Clone)] +pub struct ZkAdapter { + endpoint: String, + auth: Vec<u8>, + client: OnceCell<zk::Client>, + acl: &'static [zk::Acl], +} + +impl Debug for ZkAdapter { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Adapter"); + ds.field("endpoint", &self.endpoint); + ds.field("acl", &self.acl); + ds.finish() + } +} + +impl ZkAdapter { + async fn get_connection(&self) -> Result<zk::Client> { + if let Some(client) = self.client.get() { + return Ok(client.clone()); + } + match zk::Client::connect(&self.endpoint.clone()).await { + Ok(client) => { + if !self.auth.is_empty() { + client + .auth(ZOOKEEPER_AUTH_SCHEME.to_string(), self.auth.clone()) + .await + .map_err(parse_zookeeper_error)?; + } + self.client.set(client.clone()).ok(); + Ok(client) + } + Err(e) => Err(Error::new(ErrorKind::Unexpected, "error from zookeeper").set_source(e)), + } + } + + fn create_nested_node<'a>( + &'a self, + path: &'a str, + value: &'a [u8], + ) -> BoxFuture<'a, Result<()>> { + eprintln!("{path}"); Review Comment: Please remove this ########## core/src/services/zookeeper/backend.rs: ########## @@ -0,0 +1,305 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::HashMap; +use zookeeper_client as zk; + +use crate::raw::adapters::kv; +use crate::Scheme; +use async_trait::async_trait; +use tokio::sync::OnceCell; + +use crate::Builder; +use crate::Error; +use crate::ErrorKind; +use crate::*; + +use std::fmt::Debug; +use std::fmt::Formatter; +use std::io; + +use futures::future::{BoxFuture, FutureExt}; +use substring::Substring; + +use log::warn; + +const DEFAULT_ZOOKEEPER_ENDPOINT: &str = "127.0.0.1:2181"; +/// The scheme for zookeeper authentication +/// currently we do not support sasl authentication +const ZOOKEEPER_AUTH_SCHEME: &str = "digest"; + +/// Zookeeper backend builder +#[derive(Clone, Default)] +pub struct ZookeeperBuilder { + /// network address of the Zookeeper service + /// Default: 127.0.0.1:2181 + endpoint: Option<String>, + /// the user to connect to zookeeper service, default None + user: Option<String>, + /// the path to the password file of the user to connect to zookeeper service, default None + digest_path: Option<String>, +} + +impl ZookeeperBuilder { + /// Set the network addresses of zookeeper service + pub fn endpoint(&mut self, endpoint: &str) -> &mut Self { + if !endpoint.is_empty() { + self.endpoint = Some(endpoint.to_string()); + } + self + } + + /// Set the username of zookeeper service + pub fn user(&mut self, user: &str) -> &mut Self { + if !user.is_empty() { + self.user = Some(user.to_string()); + } + self + } + + /// Specify the auth digest path of zookeeper service + pub fn digest_path(&mut self, digest_path: &str) -> &mut Self { Review Comment: Is it normal to use `digest_path` to connect zookeeper? How about passing `password` directly? ########## core/src/services/zookeeper/backend.rs: ########## @@ -0,0 +1,305 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::HashMap; +use zookeeper_client as zk; + +use crate::raw::adapters::kv; +use crate::Scheme; +use async_trait::async_trait; +use tokio::sync::OnceCell; + +use crate::Builder; +use crate::Error; +use crate::ErrorKind; +use crate::*; + +use std::fmt::Debug; +use std::fmt::Formatter; +use std::io; + +use futures::future::{BoxFuture, FutureExt}; +use substring::Substring; + +use log::warn; + +const DEFAULT_ZOOKEEPER_ENDPOINT: &str = "127.0.0.1:2181"; +/// The scheme for zookeeper authentication +/// currently we do not support sasl authentication +const ZOOKEEPER_AUTH_SCHEME: &str = "digest"; + +/// Zookeeper backend builder +#[derive(Clone, Default)] +pub struct ZookeeperBuilder { + /// network address of the Zookeeper service + /// Default: 127.0.0.1:2181 + endpoint: Option<String>, + /// the user to connect to zookeeper service, default None + user: Option<String>, + /// the path to the password file of the user to connect to zookeeper service, default None + digest_path: Option<String>, +} + +impl ZookeeperBuilder { + /// Set the network addresses of zookeeper service + pub fn endpoint(&mut self, endpoint: &str) -> &mut Self { + if !endpoint.is_empty() { + self.endpoint = Some(endpoint.to_string()); + } + self + } + + /// Set the username of zookeeper service + pub fn user(&mut self, user: &str) -> &mut Self { + if !user.is_empty() { + self.user = Some(user.to_string()); + } + self + } + + /// Specify the auth digest path of zookeeper service + pub fn digest_path(&mut self, digest_path: &str) -> &mut Self { + if !digest_path.is_empty() { + self.digest_path = Some(digest_path.to_string()); + } + self + } +} + +impl Debug for ZookeeperBuilder { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Builder"); + if let Some(endpoint) = self.endpoint.clone() { + ds.field("endpoint", &endpoint); + } + if let Some(user) = self.user.clone() { + ds.field("user", &user); + } + if let Some(digest_path) = self.digest_path.clone() { + ds.field("digest_path", &digest_path); + } + ds.finish() + } +} + +impl Builder for ZookeeperBuilder { + const SCHEME: Scheme = Scheme::Zookeeper; + type Accessor = ZookeeperBackend; + + fn from_map(map: HashMap<String, String>) -> Self { + let mut builder = ZookeeperBuilder::default(); + + map.get("endpoint").map(|v| builder.endpoint(v)); + map.get("user").map(|v| builder.user(v)); + map.get("digest_path").map(|v| builder.digest_path(v)); + + builder + } + + fn build(&mut self) -> Result<Self::Accessor> { + let endpoint = match self.endpoint.clone() { + None => DEFAULT_ZOOKEEPER_ENDPOINT.to_string(), + Some(endpoint) => endpoint, + }; + let (auth, acl) = match (self.user.clone(), self.digest_path.clone()) { + (Some(user), Some(digest_path)) => { + let password = std::fs::read(digest_path).map_err(parse_file_error)?; + let auth = [format!("{user}:").as_bytes().to_vec(), password].concat(); + (auth, zk::Acl::creator_all()) + } + _ => { + // TODO: change to warn + warn!("username and password isn't set, default use `anyone` acl"); + (Vec::<u8>::new(), zk::Acl::anyone_all()) + } + }; + + Ok(ZookeeperBackend::new(ZkAdapter { + endpoint, + auth, + acl, + client: OnceCell::new(), + })) + } +} + +/// Backend for Zookeeper service +pub type ZookeeperBackend = kv::Backend<ZkAdapter>; + +#[derive(Clone)] +pub struct ZkAdapter { + endpoint: String, + auth: Vec<u8>, + client: OnceCell<zk::Client>, + acl: &'static [zk::Acl], +} + +impl Debug for ZkAdapter { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Adapter"); + ds.field("endpoint", &self.endpoint); + ds.field("acl", &self.acl); + ds.finish() + } +} + +impl ZkAdapter { + async fn get_connection(&self) -> Result<zk::Client> { + if let Some(client) = self.client.get() { + return Ok(client.clone()); + } + match zk::Client::connect(&self.endpoint.clone()).await { + Ok(client) => { + if !self.auth.is_empty() { + client + .auth(ZOOKEEPER_AUTH_SCHEME.to_string(), self.auth.clone()) + .await + .map_err(parse_zookeeper_error)?; + } + self.client.set(client.clone()).ok(); + Ok(client) + } + Err(e) => Err(Error::new(ErrorKind::Unexpected, "error from zookeeper").set_source(e)), + } + } + + fn create_nested_node<'a>( Review Comment: Maybe we can use `async fn create_nested_node()` directly instead of playing with `BoxFuture`? ########## core/src/services/zookeeper/backend.rs: ########## @@ -0,0 +1,305 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::HashMap; +use zookeeper_client as zk; + +use crate::raw::adapters::kv; +use crate::Scheme; +use async_trait::async_trait; +use tokio::sync::OnceCell; + +use crate::Builder; +use crate::Error; +use crate::ErrorKind; +use crate::*; + +use std::fmt::Debug; +use std::fmt::Formatter; +use std::io; + +use futures::future::{BoxFuture, FutureExt}; +use substring::Substring; + +use log::warn; + +const DEFAULT_ZOOKEEPER_ENDPOINT: &str = "127.0.0.1:2181"; +/// The scheme for zookeeper authentication +/// currently we do not support sasl authentication +const ZOOKEEPER_AUTH_SCHEME: &str = "digest"; + +/// Zookeeper backend builder +#[derive(Clone, Default)] +pub struct ZookeeperBuilder { + /// network address of the Zookeeper service + /// Default: 127.0.0.1:2181 + endpoint: Option<String>, + /// the user to connect to zookeeper service, default None + user: Option<String>, + /// the path to the password file of the user to connect to zookeeper service, default None + digest_path: Option<String>, +} + +impl ZookeeperBuilder { + /// Set the network addresses of zookeeper service + pub fn endpoint(&mut self, endpoint: &str) -> &mut Self { + if !endpoint.is_empty() { + self.endpoint = Some(endpoint.to_string()); + } + self + } + + /// Set the username of zookeeper service + pub fn user(&mut self, user: &str) -> &mut Self { + if !user.is_empty() { + self.user = Some(user.to_string()); + } + self + } + + /// Specify the auth digest path of zookeeper service + pub fn digest_path(&mut self, digest_path: &str) -> &mut Self { + if !digest_path.is_empty() { + self.digest_path = Some(digest_path.to_string()); + } + self + } +} + +impl Debug for ZookeeperBuilder { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Builder"); + if let Some(endpoint) = self.endpoint.clone() { + ds.field("endpoint", &endpoint); + } + if let Some(user) = self.user.clone() { + ds.field("user", &user); + } + if let Some(digest_path) = self.digest_path.clone() { + ds.field("digest_path", &digest_path); + } + ds.finish() + } +} + +impl Builder for ZookeeperBuilder { + const SCHEME: Scheme = Scheme::Zookeeper; + type Accessor = ZookeeperBackend; + + fn from_map(map: HashMap<String, String>) -> Self { + let mut builder = ZookeeperBuilder::default(); + + map.get("endpoint").map(|v| builder.endpoint(v)); + map.get("user").map(|v| builder.user(v)); + map.get("digest_path").map(|v| builder.digest_path(v)); + + builder + } + + fn build(&mut self) -> Result<Self::Accessor> { + let endpoint = match self.endpoint.clone() { + None => DEFAULT_ZOOKEEPER_ENDPOINT.to_string(), + Some(endpoint) => endpoint, + }; + let (auth, acl) = match (self.user.clone(), self.digest_path.clone()) { + (Some(user), Some(digest_path)) => { + let password = std::fs::read(digest_path).map_err(parse_file_error)?; + let auth = [format!("{user}:").as_bytes().to_vec(), password].concat(); + (auth, zk::Acl::creator_all()) + } + _ => { + // TODO: change to warn + warn!("username and password isn't set, default use `anyone` acl"); + (Vec::<u8>::new(), zk::Acl::anyone_all()) + } + }; + + Ok(ZookeeperBackend::new(ZkAdapter { + endpoint, + auth, + acl, + client: OnceCell::new(), + })) + } +} + +/// Backend for Zookeeper service +pub type ZookeeperBackend = kv::Backend<ZkAdapter>; + +#[derive(Clone)] +pub struct ZkAdapter { + endpoint: String, + auth: Vec<u8>, + client: OnceCell<zk::Client>, + acl: &'static [zk::Acl], +} + +impl Debug for ZkAdapter { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Adapter"); + ds.field("endpoint", &self.endpoint); + ds.field("acl", &self.acl); + ds.finish() + } +} + +impl ZkAdapter { + async fn get_connection(&self) -> Result<zk::Client> { + if let Some(client) = self.client.get() { + return Ok(client.clone()); + } + match zk::Client::connect(&self.endpoint.clone()).await { + Ok(client) => { + if !self.auth.is_empty() { + client + .auth(ZOOKEEPER_AUTH_SCHEME.to_string(), self.auth.clone()) + .await + .map_err(parse_zookeeper_error)?; + } + self.client.set(client.clone()).ok(); + Ok(client) + } + Err(e) => Err(Error::new(ErrorKind::Unexpected, "error from zookeeper").set_source(e)), + } + } + + fn create_nested_node<'a>( + &'a self, + path: &'a str, + value: &'a [u8], + ) -> BoxFuture<'a, Result<()>> { + eprintln!("{path}"); + let mut path = path.to_string(); + async move { + return match self + .get_connection() + .await? + .create( + &path, + value, + &zk::CreateOptions::new(zk::CreateMode::Persistent, self.acl), + ) + .await + { + Ok(_) => Ok(()), + Err(e) => match e { + zk::Error::NoNode => { + let idx = path.rfind('/').unwrap(); + let tmpath = path.clone(); + path = path.to_string().substring(0, idx).to_string(); + if path.as_bytes()[0] != b'/' { + path = "/".to_string() + path.strip_suffix('/').unwrap_or(&path); + } + match self.create_nested_node(&path, value).await { + Ok(()) => {} + Err(e) => { + return Err(Error::new( + ErrorKind::Unexpected, + "error from zookeeper", + ) + .set_source(e)) + } + }; + match self + .get_connection() + .await? + .create( + &tmpath, + value, + &zk::CreateOptions::new(zk::CreateMode::Persistent, self.acl), + ) + .await + { + Ok(_) => Ok(()), + Err(e) => { + Err(Error::new(ErrorKind::Unexpected, "error from zookeeper") + .set_source(e)) + } + } + } + _ => { + Err(Error::new(ErrorKind::Unexpected, "error from zookeeper").set_source(e)) + } + }, + }; + } + .boxed() + } +} + +#[async_trait] +impl kv::Adapter for ZkAdapter { + fn metadata(&self) -> kv::Metadata { + kv::Metadata::new( + Scheme::Zookeeper, + "ZooKeeper", + Capability { + read: true, + write: true, + ..Default::default() + }, + ) + } + + async fn get(&self, path: &str) -> Result<Option<Vec<u8>>> { + let path = "/".to_string() + path.strip_suffix('/').unwrap_or(path); Review Comment: We can use https://opendal.apache.org/docs/rust/opendal/raw/fn.build_rooted_abs_path.html ########## core/src/services/zookeeper/backend.rs: ########## @@ -0,0 +1,305 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::collections::HashMap; +use zookeeper_client as zk; + +use crate::raw::adapters::kv; +use crate::Scheme; +use async_trait::async_trait; +use tokio::sync::OnceCell; + +use crate::Builder; +use crate::Error; +use crate::ErrorKind; +use crate::*; + +use std::fmt::Debug; +use std::fmt::Formatter; +use std::io; + +use futures::future::{BoxFuture, FutureExt}; +use substring::Substring; + +use log::warn; + +const DEFAULT_ZOOKEEPER_ENDPOINT: &str = "127.0.0.1:2181"; +/// The scheme for zookeeper authentication +/// currently we do not support sasl authentication +const ZOOKEEPER_AUTH_SCHEME: &str = "digest"; + +/// Zookeeper backend builder +#[derive(Clone, Default)] +pub struct ZookeeperBuilder { + /// network address of the Zookeeper service + /// Default: 127.0.0.1:2181 + endpoint: Option<String>, + /// the user to connect to zookeeper service, default None + user: Option<String>, + /// the path to the password file of the user to connect to zookeeper service, default None + digest_path: Option<String>, +} + +impl ZookeeperBuilder { + /// Set the network addresses of zookeeper service + pub fn endpoint(&mut self, endpoint: &str) -> &mut Self { + if !endpoint.is_empty() { + self.endpoint = Some(endpoint.to_string()); + } + self + } + + /// Set the username of zookeeper service + pub fn user(&mut self, user: &str) -> &mut Self { + if !user.is_empty() { + self.user = Some(user.to_string()); + } + self + } + + /// Specify the auth digest path of zookeeper service + pub fn digest_path(&mut self, digest_path: &str) -> &mut Self { + if !digest_path.is_empty() { + self.digest_path = Some(digest_path.to_string()); + } + self + } +} + +impl Debug for ZookeeperBuilder { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Builder"); + if let Some(endpoint) = self.endpoint.clone() { + ds.field("endpoint", &endpoint); + } + if let Some(user) = self.user.clone() { + ds.field("user", &user); + } + if let Some(digest_path) = self.digest_path.clone() { + ds.field("digest_path", &digest_path); + } + ds.finish() + } +} + +impl Builder for ZookeeperBuilder { + const SCHEME: Scheme = Scheme::Zookeeper; + type Accessor = ZookeeperBackend; + + fn from_map(map: HashMap<String, String>) -> Self { + let mut builder = ZookeeperBuilder::default(); + + map.get("endpoint").map(|v| builder.endpoint(v)); + map.get("user").map(|v| builder.user(v)); + map.get("digest_path").map(|v| builder.digest_path(v)); + + builder + } + + fn build(&mut self) -> Result<Self::Accessor> { + let endpoint = match self.endpoint.clone() { + None => DEFAULT_ZOOKEEPER_ENDPOINT.to_string(), + Some(endpoint) => endpoint, + }; + let (auth, acl) = match (self.user.clone(), self.digest_path.clone()) { + (Some(user), Some(digest_path)) => { + let password = std::fs::read(digest_path).map_err(parse_file_error)?; + let auth = [format!("{user}:").as_bytes().to_vec(), password].concat(); + (auth, zk::Acl::creator_all()) + } + _ => { + // TODO: change to warn + warn!("username and password isn't set, default use `anyone` acl"); + (Vec::<u8>::new(), zk::Acl::anyone_all()) + } + }; + + Ok(ZookeeperBackend::new(ZkAdapter { + endpoint, + auth, + acl, + client: OnceCell::new(), + })) + } +} + +/// Backend for Zookeeper service +pub type ZookeeperBackend = kv::Backend<ZkAdapter>; + +#[derive(Clone)] +pub struct ZkAdapter { + endpoint: String, + auth: Vec<u8>, + client: OnceCell<zk::Client>, + acl: &'static [zk::Acl], +} + +impl Debug for ZkAdapter { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + let mut ds = f.debug_struct("Adapter"); + ds.field("endpoint", &self.endpoint); + ds.field("acl", &self.acl); + ds.finish() + } +} + +impl ZkAdapter { + async fn get_connection(&self) -> Result<zk::Client> { + if let Some(client) = self.client.get() { + return Ok(client.clone()); + } + match zk::Client::connect(&self.endpoint.clone()).await { + Ok(client) => { + if !self.auth.is_empty() { + client + .auth(ZOOKEEPER_AUTH_SCHEME.to_string(), self.auth.clone()) + .await + .map_err(parse_zookeeper_error)?; + } + self.client.set(client.clone()).ok(); + Ok(client) + } + Err(e) => Err(Error::new(ErrorKind::Unexpected, "error from zookeeper").set_source(e)), + } + } + + fn create_nested_node<'a>( + &'a self, + path: &'a str, + value: &'a [u8], + ) -> BoxFuture<'a, Result<()>> { + eprintln!("{path}"); + let mut path = path.to_string(); + async move { + return match self + .get_connection() + .await? + .create( + &path, + value, + &zk::CreateOptions::new(zk::CreateMode::Persistent, self.acl), + ) + .await + { + Ok(_) => Ok(()), + Err(e) => match e { + zk::Error::NoNode => { + let idx = path.rfind('/').unwrap(); + let tmpath = path.clone(); + path = path.to_string().substring(0, idx).to_string(); + if path.as_bytes()[0] != b'/' { + path = "/".to_string() + path.strip_suffix('/').unwrap_or(&path); + } + match self.create_nested_node(&path, value).await { Review Comment: If it's required to create parent node first for zookeepr, I perfer to check if parent exist first instead handling error. -- This is an automated message from the Apache Git Service. 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