refactor: add an abstraction for an indexed store

This makes it easier to write a server without the HTTP layer.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/indexedstore.rs b/src/indexedstore.rs
new file mode 100644
index 0000000..4cc90cc
--- /dev/null
+++ b/src/indexedstore.rs
@@ -0,0 +1,57 @@
+use crate::chunk::DataChunk;
+use crate::chunkid::ChunkId;
+use crate::chunkmeta::ChunkMeta;
+use crate::index::Index;
+use crate::store::Store;
+use std::path::Path;
+
+/// A store for chunks and their metadata.
+///
+/// This combines Store and Index into one interface to make it easier
+/// to handle the server side storage of chunks.
+pub struct IndexedStore {
+    store: Store,
+    index: Index,
+}
+
+impl IndexedStore {
+    pub fn new(dirname: &Path) -> Self {
+        let store = Store::new(dirname);
+        let index = Index::default();
+        Self { store, index }
+    }
+
+    pub fn save(&mut self, meta: &ChunkMeta, chunk: &DataChunk) -> anyhow::Result<ChunkId> {
+        let id = ChunkId::new();
+        self.store.save(&id, meta, chunk)?;
+        self.index.insert(id.clone(), "sha256", meta.sha256());
+        if meta.is_generation() {
+            self.index.insert_generation(id.clone());
+        }
+        Ok(id)
+    }
+
+    pub fn load(&self, id: &ChunkId) -> anyhow::Result<(ChunkMeta, DataChunk)> {
+        self.store.load(id)
+    }
+
+    pub fn load_meta(&self, id: &ChunkId) -> anyhow::Result<ChunkMeta> {
+        self.store.load_meta(id)
+    }
+
+    pub fn find_by_sha256(&self, sha256: &str) -> Vec<ChunkId> {
+        self.index.find("sha256", sha256)
+    }
+
+    pub fn find_generations(&self) -> Vec<ChunkId> {
+        self.index.find_generations()
+    }
+
+    pub fn remove(&mut self, id: &ChunkId) -> anyhow::Result<()> {
+        let (meta, _) = self.store.load(id)?;
+        self.index.remove("sha256", meta.sha256());
+        self.index.remove_generation(id);
+        self.store.delete(id)?;
+        Ok(())
+    }
+}