liurenjie1024 commented on code in PR #229: URL: https://github.com/apache/iceberg-rust/pull/229#discussion_r1522752571
########## crates/catalog/sql/src/catalog.rs: ########## @@ -0,0 +1,397 @@ +// 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::sync::Arc; + +use async_trait::async_trait; +use dashmap::DashMap; +use futures::{lock::Mutex, AsyncReadExt, AsyncWriteExt}; +use sqlx::{ + any::{install_default_drivers, AnyConnectOptions, AnyRow}, + AnyConnection, ConnectOptions, Connection, Row, +}; +use std::collections::HashMap; + +use iceberg::{ + io::FileIO, spec::TableMetadata, table::Table, Catalog, Error, ErrorKind, Namespace, + NamespaceIdent, Result, TableCommit, TableCreation, TableIdent, +}; +use uuid::Uuid; + +use crate::error::from_sqlx_error; + +#[derive(Debug)] +/// Sql catalog implementation. +pub struct SqlCatalog { + name: String, + connection: Arc<Mutex<AnyConnection>>, + storage: FileIO, + cache: Arc<DashMap<TableIdent, (String, TableMetadata)>>, +} + +impl SqlCatalog { + /// Create new sql catalog instance + pub async fn new(url: &str, name: &str, storage: FileIO) -> Result<Self> { + install_default_drivers(); + + let mut connection = AnyConnectOptions::connect( + &AnyConnectOptions::from_url(&url.try_into()?).map_err(from_sqlx_error)?, + ) + .await + .map_err(from_sqlx_error)?; + + connection + .transaction(|txn| { + Box::pin(async move { + sqlx::query( + "create table if not exists iceberg_tables ( + catalog_name text not null, + table_namespace text not null, + table_name text not null, + metadata_location text not null, + previous_metadata_location text, + primary key (catalog_name, table_namespace, table_name) + );", + ) + .execute(&mut **txn) + .await + }) + }) + .await + .map_err(from_sqlx_error)?; + + connection + .transaction(|txn| { + Box::pin(async move { + sqlx::query( + "create table if not exists iceberg_namespace_properties ( + catalog_name text not null, + namespace text not null, + property_key text, + property_value text, + primary key (catalog_name, namespace, property_key) + );", + ) + .execute(&mut **txn) + .await + }) + }) + .await + .map_err(from_sqlx_error)?; + + Ok(SqlCatalog { + name: name.to_owned(), + connection: Arc::new(Mutex::new(connection)), + storage, + cache: Arc::new(DashMap::new()), + }) + } +} + +#[derive(Debug)] +struct TableRef { + table_namespace: String, + table_name: String, + metadata_location: String, + _previous_metadata_location: Option<String>, +} + +fn query_map(row: &AnyRow) -> std::result::Result<TableRef, sqlx::Error> { + Ok(TableRef { + table_namespace: row.try_get(0)?, + table_name: row.try_get(1)?, + metadata_location: row.try_get(2)?, + _previous_metadata_location: row.try_get::<String, _>(3).map(Some).or_else(|err| { + if let sqlx::Error::ColumnDecode { + index: _, + source: _, + } = err + { + Ok(None) + } else { + Err(err) + } + })?, + }) +} + +#[async_trait] +impl Catalog for SqlCatalog { + async fn list_namespaces( + &self, + _parent: Option<&NamespaceIdent>, + ) -> Result<Vec<NamespaceIdent>> { + let mut connection = self.connection.lock().await; + let rows = connection.transaction(|txn|{ + let name = self.name.clone(); + Box::pin(async move { + sqlx::query(&format!("select distinct table_namespace from iceberg_tables where catalog_name = '{}';",&name)).fetch_all(&mut **txn).await + })}).await.map_err(from_sqlx_error)?; + let iter = rows.iter().map(|row| row.try_get::<String, _>(0)); + + Ok(iter + .map(|x| { + x.and_then(|y| { + NamespaceIdent::from_vec( + y.split('.').map(ToString::to_string).collect::<Vec<_>>(), + ) + .map_err(|err| sqlx::Error::Decode(Box::new(err))) + }) + }) + .collect::<std::result::Result<_, sqlx::Error>>() + .map_err(from_sqlx_error)?) + } + + async fn create_namespace( + &self, + _namespace: &NamespaceIdent, + _properties: HashMap<String, String>, + ) -> Result<Namespace> { + todo!() + } + + async fn get_namespace(&self, _namespace: &NamespaceIdent) -> Result<Namespace> { + todo!() + } + + async fn namespace_exists(&self, _namespace: &NamespaceIdent) -> Result<bool> { + todo!() + } + + async fn update_namespace( + &self, + _namespace: &NamespaceIdent, + _properties: HashMap<String, String>, + ) -> Result<()> { + todo!() + } + + async fn drop_namespace(&self, _namespace: &NamespaceIdent) -> Result<()> { + todo!() + } + + async fn list_tables(&self, namespace: &NamespaceIdent) -> Result<Vec<TableIdent>> { + let mut connection = self.connection.lock().await; + let rows = connection.transaction(|txn|{ + let name = self.name.clone(); + let namespace = namespace.encode_in_url(); + Box::pin(async move { + sqlx::query(&format!("select table_namespace, table_name, metadata_location, previous_metadata_location from iceberg_tables where catalog_name = '{}' and table_namespace = '{}';",&name, &namespace)).fetch_all(&mut **txn).await + })}).await.map_err(from_sqlx_error)?; + let iter = rows.iter().map(query_map); + + Ok(iter + .map(|x| { + x.and_then(|y| { + let namespace = NamespaceIdent::from_vec( + y.table_namespace + .split('.') + .map(ToString::to_string) + .collect::<Vec<_>>(), + ) + .map_err(|err| sqlx::Error::Decode(Box::new(err)))?; + Ok(TableIdent::new(namespace, y.table_name)) + }) + }) + .collect::<std::result::Result<_, sqlx::Error>>() + .map_err(from_sqlx_error)?) + } + + async fn stat_table(&self, identifier: &TableIdent) -> Result<bool> { + let mut connection = self.connection.lock().await; + let rows = connection.transaction(|txn|{ + let catalog_name = self.name.clone(); + let namespace = identifier.namespace().encode_in_url(); + let name = identifier.name().to_string(); + Box::pin(async move { + sqlx::query(&format!("select table_namespace, table_name, metadata_location, previous_metadata_location from iceberg_tables where catalog_name = '{}' and table_namespace = '{}' and table_name = '{}';",&catalog_name, + &namespace, + &name)).fetch_all(&mut **txn).await + })}).await.map_err(from_sqlx_error)?; + let mut iter = rows.iter().map(query_map); + + Ok(iter.next().is_some()) + } + + async fn drop_table(&self, _identifier: &TableIdent) -> Result<()> { + todo!() + } + + async fn load_table(&self, identifier: &TableIdent) -> Result<Table> { + let metadata_location = { Review Comment: I'm thinking maybe we should have a standalone data structure for caching, just like [CachingCatalog in java](https://github.com/apache/iceberg/blob/c07f2aabc0a1d02f068ecf1514d2479c0fbdd3b0/core/src/main/java/org/apache/iceberg/CachingCatalog.java#L46) -- This is an automated message from the Apache Git Service. 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