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feat: Support cloud storage in
scan_csv (pola-rs#16674)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| use std::path::Path; | ||
| use std::sync::{Arc, RwLock}; | ||
| use std::time::Duration; | ||
|
|
||
| use once_cell::sync::Lazy; | ||
| use polars_core::config; | ||
| use polars_error::PolarsResult; | ||
| use polars_utils::aliases::PlHashMap; | ||
|
|
||
| use super::entry::{FileCacheEntry, DATA_PREFIX, METADATA_PREFIX}; | ||
| use super::eviction::EvictionManager; | ||
| use super::file_fetcher::FileFetcher; | ||
| use super::utils::FILE_CACHE_PREFIX; | ||
| use crate::prelude::is_cloud_url; | ||
|
|
||
| pub static FILE_CACHE: Lazy<FileCache> = Lazy::new(|| { | ||
| let prefix = FILE_CACHE_PREFIX.as_ref(); | ||
| let prefix = Arc::<Path>::from(prefix); | ||
|
|
||
| if config::verbose() { | ||
| eprintln!("file cache prefix: {}", prefix.to_str().unwrap()); | ||
| } | ||
|
|
||
| EvictionManager { | ||
| prefix: prefix.clone(), | ||
| files_to_remove: None, | ||
| limit_since_last_access: Duration::from_secs( | ||
| std::env::var("POLARS_FILE_CACHE_TTL") | ||
| .map(|x| x.parse::<u64>().expect("integer")) | ||
| .unwrap_or(60 * 60), | ||
| ), | ||
| } | ||
| .run_in_background(); | ||
|
|
||
| FileCache::new(prefix) | ||
| }); | ||
|
|
||
| pub struct FileCache { | ||
| prefix: Arc<Path>, | ||
| entries: Arc<RwLock<PlHashMap<Arc<str>, Arc<FileCacheEntry>>>>, | ||
| } | ||
|
|
||
| impl FileCache { | ||
| fn new(prefix: Arc<Path>) -> Self { | ||
| let path = &prefix | ||
| .as_ref() | ||
| .join(std::str::from_utf8(&[METADATA_PREFIX]).unwrap()); | ||
| let _ = std::fs::create_dir_all(path); | ||
| assert!( | ||
| path.is_dir(), | ||
| "failed to create file cache metadata directory: {}", | ||
| path.to_str().unwrap(), | ||
| ); | ||
|
|
||
| let path = &prefix | ||
| .as_ref() | ||
| .join(std::str::from_utf8(&[DATA_PREFIX]).unwrap()); | ||
| let _ = std::fs::create_dir_all(path); | ||
| assert!( | ||
| path.is_dir(), | ||
| "failed to create file cache data directory: {}", | ||
| path.to_str().unwrap(), | ||
| ); | ||
|
|
||
| Self { | ||
| prefix, | ||
| entries: Default::default(), | ||
| } | ||
| } | ||
|
|
||
| /// If `uri` is a local path, it must be an absolute path. | ||
| pub fn init_entry<F: Fn() -> PolarsResult<Arc<dyn FileFetcher>>>( | ||
| &self, | ||
| uri: Arc<str>, | ||
| get_file_fetcher: F, | ||
| ) -> PolarsResult<Arc<FileCacheEntry>> { | ||
| let verbose = config::verbose(); | ||
|
|
||
| #[cfg(debug_assertions)] | ||
| { | ||
| // Local paths must be absolute or else the cache would be wrong. | ||
| if !crate::utils::is_cloud_url(uri.as_ref()) { | ||
| let path = Path::new(uri.as_ref()); | ||
| assert_eq!(path, std::fs::canonicalize(path).unwrap().as_path()); | ||
| } | ||
| } | ||
|
|
||
| { | ||
| let entries = self.entries.read().unwrap(); | ||
|
|
||
| if let Some(entry) = entries.get(uri.as_ref()) { | ||
| if verbose { | ||
| eprintln!( | ||
| "[file_cache] init_entry: return existing entry for uri = {}", | ||
| uri.clone() | ||
| ); | ||
| } | ||
| return Ok(entry.clone()); | ||
| } | ||
| } | ||
|
|
||
| let uri_hash = blake3::hash(uri.as_bytes()) | ||
| .to_hex() | ||
| .get(..32) | ||
| .unwrap() | ||
| .to_string(); | ||
|
|
||
| { | ||
| let mut entries = self.entries.write().unwrap(); | ||
|
|
||
| // May have been raced | ||
| if let Some(entry) = entries.get(uri.as_ref()) { | ||
| if verbose { | ||
| eprintln!("[file_cache] init_entry: return existing entry for uri = {} (lost init race)", uri.clone()); | ||
| } | ||
| return Ok(entry.clone()); | ||
| } | ||
|
|
||
| if verbose { | ||
| eprintln!( | ||
| "[file_cache] init_entry: creating new entry for uri = {}, hash = {}", | ||
| uri.clone(), | ||
| uri_hash.clone() | ||
| ); | ||
| } | ||
|
|
||
| let entry = Arc::new(FileCacheEntry::new( | ||
| uri.clone(), | ||
| uri_hash, | ||
| self.prefix.clone(), | ||
| get_file_fetcher()?, | ||
| )); | ||
| entries.insert_unique_unchecked(uri, entry.clone()); | ||
| Ok(entry.clone()) | ||
| } | ||
| } | ||
|
|
||
| /// This function can accept relative local paths. | ||
| pub fn get_entry(&self, uri: &str) -> Option<Arc<FileCacheEntry>> { | ||
| if is_cloud_url(uri) { | ||
| self.entries.read().unwrap().get(uri).map(Arc::clone) | ||
| } else { | ||
| let uri = std::fs::canonicalize(uri).unwrap(); | ||
| self.entries | ||
| .read() | ||
| .unwrap() | ||
| .get(uri.to_str().unwrap()) | ||
| .map(Arc::clone) | ||
| } | ||
| } | ||
| } |
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