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| 1 | +// Licensed to the Apache Software Foundation (ASF) under one |
| 2 | +// or more contributor license agreements. See the NOTICE file |
| 3 | +// distributed with this work for additional information |
| 4 | +// regarding copyright ownership. The ASF licenses this file |
| 5 | +// to you under the Apache License, Version 2.0 (the |
| 6 | +// "License"); you may not use this file except in compliance |
| 7 | +// with the License. You may obtain a copy of the License at |
| 8 | +// |
| 9 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | +// |
| 11 | +// Unless required by applicable law or agreed to in writing, |
| 12 | +// software distributed under the License is distributed on an |
| 13 | +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 14 | +// KIND, either express or implied. See the License for the |
| 15 | +// specific language governing permissions and limitations |
| 16 | +// under the License. |
| 17 | + |
| 18 | +//! Iceberg Hadoop Catalog implementation. |
| 19 | +
|
| 20 | +use std::collections::HashMap; |
| 21 | + |
| 22 | +use async_trait::async_trait; |
| 23 | +use futures::TryStreamExt; |
| 24 | +use iceberg::io::FileIO; |
| 25 | +use iceberg::table::Table; |
| 26 | +use iceberg::{ |
| 27 | + Catalog, Error, ErrorKind, Namespace, NamespaceIdent, Result, TableCommit, TableCreation, |
| 28 | + TableIdent, |
| 29 | +}; |
| 30 | +use opendal::EntryMode; |
| 31 | + |
| 32 | +/// Represents a hadoop catalog backed by storage from a `FileIO` |
| 33 | +#[derive(Debug)] |
| 34 | +pub struct HadoopCatalog { |
| 35 | + file_io: FileIO, |
| 36 | + warehouse_root: String, |
| 37 | +} |
| 38 | + |
| 39 | +impl HadoopCatalog { |
| 40 | + /// Creates a new instance of a `HadoopCatalog` |
| 41 | + /// The `warehouse_root` should be the absolute path to the warehouse directory, including the scheme prefix for the FileIO |
| 42 | + pub fn new(warehouse_root: String, file_io: FileIO) -> Self { |
| 43 | + // TODO: validate the warehouse_root starts with the same scheme as the FileIO |
| 44 | + Self { |
| 45 | + file_io, |
| 46 | + warehouse_root, |
| 47 | + } |
| 48 | + } |
| 49 | +} |
| 50 | + |
| 51 | +#[async_trait] |
| 52 | +impl Catalog for HadoopCatalog { |
| 53 | + // Unsupported operations in Hadoop Catalog |
| 54 | + async fn create_namespace( |
| 55 | + &self, |
| 56 | + _namespace: &NamespaceIdent, |
| 57 | + _properties: HashMap<String, String>, |
| 58 | + ) -> Result<Namespace> { |
| 59 | + Err(Error::new( |
| 60 | + ErrorKind::FeatureUnsupported, |
| 61 | + "Creating namespaces is not supported in hadoop catalog", |
| 62 | + )) |
| 63 | + } |
| 64 | + |
| 65 | + async fn update_namespace( |
| 66 | + &self, |
| 67 | + _namespace: &NamespaceIdent, |
| 68 | + _properties: HashMap<String, String>, |
| 69 | + ) -> Result<()> { |
| 70 | + Err(Error::new( |
| 71 | + ErrorKind::FeatureUnsupported, |
| 72 | + "Updating namespaces is not supported in hadoop catalog", |
| 73 | + )) |
| 74 | + } |
| 75 | + |
| 76 | + async fn drop_namespace(&self, _namespace: &NamespaceIdent) -> Result<()> { |
| 77 | + Err(Error::new( |
| 78 | + ErrorKind::FeatureUnsupported, |
| 79 | + "Dropping namespaces is not supported in hadoop catalog", |
| 80 | + )) |
| 81 | + } |
| 82 | + |
| 83 | + async fn create_table( |
| 84 | + &self, |
| 85 | + _namespace: &NamespaceIdent, |
| 86 | + _creation: TableCreation, |
| 87 | + ) -> Result<Table> { |
| 88 | + Err(Error::new( |
| 89 | + ErrorKind::FeatureUnsupported, |
| 90 | + "Creating tables is not supported in hadoop catalog", |
| 91 | + )) |
| 92 | + } |
| 93 | + |
| 94 | + async fn drop_table(&self, _table: &TableIdent) -> Result<()> { |
| 95 | + Err(Error::new( |
| 96 | + ErrorKind::FeatureUnsupported, |
| 97 | + "Dropping tables is not supported in hadoop catalog", |
| 98 | + )) |
| 99 | + } |
| 100 | + |
| 101 | + async fn rename_table(&self, _src: &TableIdent, _dest: &TableIdent) -> Result<()> { |
| 102 | + Err(Error::new( |
| 103 | + ErrorKind::FeatureUnsupported, |
| 104 | + "Renaming tables is not supported in hadoop catalog", |
| 105 | + )) |
| 106 | + } |
| 107 | + |
| 108 | + async fn update_table(&self, _commit: TableCommit) -> Result<Table> { |
| 109 | + Err(Error::new( |
| 110 | + ErrorKind::FeatureUnsupported, |
| 111 | + "Updating tables is not supported in hadoop catalog", |
| 112 | + )) |
| 113 | + } |
| 114 | + |
| 115 | + // Supported operations in Hadoop Catalog |
| 116 | + async fn list_namespaces( |
| 117 | + &self, |
| 118 | + _parent: Option<&NamespaceIdent>, |
| 119 | + ) -> Result<Vec<NamespaceIdent>> { |
| 120 | + Err(Error::new( |
| 121 | + ErrorKind::FeatureUnsupported, |
| 122 | + "Not implemented yet", |
| 123 | + )) |
| 124 | + } |
| 125 | + |
| 126 | + async fn namespace_exists(&self, _namespace: &NamespaceIdent) -> Result<bool> { |
| 127 | + Err(Error::new( |
| 128 | + ErrorKind::FeatureUnsupported, |
| 129 | + "Not implemented yet", |
| 130 | + )) |
| 131 | + } |
| 132 | + |
| 133 | + async fn get_namespace(&self, _namespace: &NamespaceIdent) -> Result<Namespace> { |
| 134 | + Err(Error::new( |
| 135 | + ErrorKind::FeatureUnsupported, |
| 136 | + "Not implemented yet", |
| 137 | + )) |
| 138 | + } |
| 139 | + |
| 140 | + async fn load_table(&self, _table_identifier: &TableIdent) -> Result<Table> { |
| 141 | + Err(Error::new( |
| 142 | + ErrorKind::FeatureUnsupported, |
| 143 | + "Not implemented yet", |
| 144 | + )) |
| 145 | + } |
| 146 | + |
| 147 | + async fn table_exists(&self, _table: &TableIdent) -> Result<bool> { |
| 148 | + Err(Error::new( |
| 149 | + ErrorKind::FeatureUnsupported, |
| 150 | + "Not implemented yet", |
| 151 | + )) |
| 152 | + } |
| 153 | + |
| 154 | + async fn list_tables(&self, namespace: &NamespaceIdent) -> Result<Vec<TableIdent>> { |
| 155 | + // List the tables in the specified namespace |
| 156 | + let path = format!("{}/{}/", self.warehouse_root, namespace.to_string()); |
| 157 | + let mut tables = Vec::new(); |
| 158 | + |
| 159 | + let mut lister = self.file_io.lister(&path).await?; |
| 160 | + while let Some(entry) = lister.try_next().await? { |
| 161 | + if matches!(entry.metadata().mode(), EntryMode::DIR) { |
| 162 | + if path.ends_with(entry.path()) { |
| 163 | + // Skip the root directory itself |
| 164 | + continue; |
| 165 | + } |
| 166 | + |
| 167 | + let table_name = entry |
| 168 | + .name() |
| 169 | + .strip_suffix("/") |
| 170 | + .unwrap_or(entry.name()) |
| 171 | + .to_string(); |
| 172 | + |
| 173 | + let table_ident = TableIdent { |
| 174 | + namespace: namespace.clone(), |
| 175 | + name: table_name, |
| 176 | + }; |
| 177 | + |
| 178 | + // TODO: validate the directory contains metadata files |
| 179 | + tables.push(table_ident); |
| 180 | + } |
| 181 | + } |
| 182 | + |
| 183 | + Ok(tables) |
| 184 | + } |
| 185 | +} |
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