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Extend source to enable read from remote storage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // 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. | ||
|
|
||
| //! Object store that represents the Local File System. | ||
|
|
||
| use crate::datasource::object_store::{ObjectReader, ObjectStore}; | ||
| use crate::error::DataFusionError; | ||
| use crate::error::Result; | ||
| use crate::parquet::file::reader::{ChunkReader, Length}; | ||
| use std::any::Any; | ||
| use std::fs; | ||
| use std::fs::{metadata, File}; | ||
| use std::io::Read; | ||
| use std::sync::Arc; | ||
|
|
||
| #[derive(Debug)] | ||
| /// Local File System as Object Store. | ||
| pub struct LocalFileSystem; | ||
|
|
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| impl ObjectStore for LocalFileSystem { | ||
| fn as_any(&self) -> &dyn Any { | ||
| self | ||
| } | ||
|
|
||
| fn list_all_files(&self, path: &str, ext: &str) -> Result<Vec<String>> { | ||
| list_all(path, ext) | ||
| } | ||
|
|
||
| fn get_reader(&self, file_path: &str) -> Result<Arc<dyn ObjectReader>> { | ||
| let file = File::open(file_path)?; | ||
| let reader = LocalFSObjectReader::new(file)?; | ||
| Ok(Arc::new(reader)) | ||
| } | ||
| } | ||
|
|
||
| struct LocalFSObjectReader { | ||
| file: File, | ||
| } | ||
|
|
||
| impl LocalFSObjectReader { | ||
| fn new(file: File) -> Result<Self> { | ||
| Ok(Self { file }) | ||
| } | ||
| } | ||
|
|
||
| impl ObjectReader for LocalFSObjectReader { | ||
| fn get_reader(&self, start: u64, length: usize) -> Box<dyn Read> { | ||
| Box::new(FileSegmentReader::new( | ||
| self.file.try_clone().unwrap(), | ||
| start, | ||
| length, | ||
| )) | ||
| } | ||
|
|
||
| fn length(&self) -> u64 { | ||
| self.file.len() | ||
| } | ||
| } | ||
|
|
||
| struct FileSegmentReader { | ||
| file: File, | ||
| start: u64, | ||
| length: usize, | ||
| } | ||
|
|
||
| impl FileSegmentReader { | ||
| fn new(file: File, start: u64, length: usize) -> Self { | ||
| Self { | ||
| file, | ||
| start, | ||
| length, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Read for FileSegmentReader { | ||
| fn read(&mut self, buf: &mut [u8]) -> std::result::Result<usize, std::io::Error> { | ||
| let mut file_source = self.file.get_read(self.start, self.length)?; | ||
| file_source.read(buf) | ||
| } | ||
| } | ||
|
|
||
| fn list_all(root_path: &str, ext: &str) -> Result<Vec<String>> { | ||
| let mut filenames: Vec<String> = Vec::new(); | ||
| list_all_files(root_path, &mut filenames, ext)?; | ||
| Ok(filenames) | ||
| } | ||
|
|
||
| /// Recursively build a list of files in a directory with a given extension with an accumulator list | ||
| fn list_all_files(dir: &str, filenames: &mut Vec<String>, ext: &str) -> Result<()> { | ||
| let metadata = metadata(dir)?; | ||
| if metadata.is_file() { | ||
| if dir.ends_with(ext) { | ||
| filenames.push(dir.to_string()); | ||
| } | ||
| } else { | ||
| for entry in fs::read_dir(dir)? { | ||
| let entry = entry?; | ||
| let path = entry.path(); | ||
| if let Some(path_name) = path.to_str() { | ||
| if path.is_dir() { | ||
| list_all_files(path_name, filenames, ext)?; | ||
| } else if path_name.ends_with(ext) { | ||
| filenames.push(path_name.to_string()); | ||
| } | ||
| } else { | ||
| return Err(DataFusionError::Plan("Invalid path".to_string())); | ||
| } | ||
| } | ||
| } | ||
| Ok(()) | ||
| } |
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