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-rw-r--r--src/store.rs42
1 files changed, 33 insertions, 9 deletions
diff --git a/src/store.rs b/src/store.rs
index 8d50b2f..a415d7a 100644
--- a/src/store.rs
+++ b/src/store.rs
@@ -1,6 +1,7 @@
use crate::chunk::DataChunk;
use crate::chunkid::ChunkId;
use crate::chunkmeta::ChunkMeta;
+use anyhow::Context;
use std::path::{Path, PathBuf};
/// Store chunks, with metadata, persistently.
@@ -20,35 +21,58 @@ impl Store {
}
}
- // Construct name for a file in the store from chunk id and suffix.
- fn filename(&self, id: &ChunkId, suffix: &str) -> PathBuf {
- self.dir.join(format!("{}.{}", id, suffix))
+ // Construct name for a files in the store from chunk id.
+ //
+ // The name of directory containing the file is returned
+ // separately to make it easier to create it if needed.
+ fn filenames(&self, id: &ChunkId) -> (PathBuf, PathBuf, PathBuf) {
+ let bytes = id.as_bytes();
+ assert!(bytes.len() > 3);
+ let a = bytes[0];
+ let b = bytes[1];
+ let c = bytes[2];
+ let dir = self.dir.join(format!("{}/{}/{}", a, b, c));
+ let meta = dir.join(format!("{}.{}", id, "meta"));
+ let data = dir.join(format!("{}.{}", id, "data"));
+ (dir, meta, data)
}
/// Save a chunk into a store.
pub fn save(&self, id: &ChunkId, meta: &ChunkMeta, chunk: &DataChunk) -> anyhow::Result<()> {
- std::fs::write(&self.filename(id, "meta"), meta.to_json())?;
- std::fs::write(&self.filename(id, "data"), chunk.data())?;
+ let (dir, metaname, dataname) = &self.filenames(id);
+
+ if !dir.exists() {
+ let res = std::fs::create_dir_all(dir).into();
+ if let Err(_) = res {
+ return res.with_context(|| format!("creating directory {}", dir.display()));
+ }
+ }
+
+ std::fs::write(&metaname, meta.to_json())?;
+ std::fs::write(&dataname, chunk.data())?;
Ok(())
}
/// Load a chunk's metadata from a store.
pub fn load_meta(&self, id: &ChunkId) -> anyhow::Result<ChunkMeta> {
- let meta = std::fs::read(&self.filename(id, "meta"))?;
+ let (_, metaname, _) = &self.filenames(id);
+ let meta = std::fs::read(&metaname)?;
Ok(serde_json::from_slice(&meta)?)
}
/// Load a chunk from a store.
pub fn load(&self, id: &ChunkId) -> anyhow::Result<(ChunkMeta, DataChunk)> {
+ let (_, _, dataname) = &self.filenames(id);
let meta = self.load_meta(id)?;
- let data = std::fs::read(&self.filename(id, "data"))?;
+ let data = std::fs::read(&dataname)?;
Ok((meta, DataChunk::new(data)))
}
/// Delete a chunk from a store.
pub fn delete(&self, id: &ChunkId) -> anyhow::Result<()> {
- std::fs::remove_file(&self.filename(id, "meta"))?;
- std::fs::remove_file(&self.filename(id, "data"))?;
+ let (_, metaname, dataname) = &self.filenames(id);
+ std::fs::remove_file(&metaname)?;
+ std::fs::remove_file(&dataname)?;
Ok(())
}
}