From 74751e82695b4b0dbed3466a2caf120a020b4229 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 16 Oct 2020 07:49:02 +0300
Subject: feat: obnam-restore restores generation to stdout

---
 src/chunk.rs | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

(limited to 'src/chunk.rs')

diff --git a/src/chunk.rs b/src/chunk.rs
index 17159e0..e1358ee 100644
--- a/src/chunk.rs
+++ b/src/chunk.rs
@@ -1,4 +1,6 @@
-use serde::Serialize;
+use crate::chunkid::ChunkId;
+use serde::{Deserialize, Serialize};
+use std::default::Default;
 
 /// Store an arbitrary chunk of data.
 ///
@@ -6,7 +8,7 @@ use serde::Serialize;
 ///
 /// A chunk also contains its associated metadata, except its
 /// identifier.
-#[derive(Debug, Serialize)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct DataChunk {
     data: Vec<u8>,
 }
@@ -22,3 +24,31 @@ impl DataChunk {
         &self.data
     }
 }
+
+#[derive(Default, Debug, Serialize, Deserialize)]
+pub struct GenerationChunk {
+    chunk_ids: Vec<ChunkId>,
+}
+
+impl GenerationChunk {
+    pub fn new(chunk_ids: Vec<ChunkId>) -> Self {
+        Self { chunk_ids }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.chunk_ids.is_empty()
+    }
+
+    pub fn len(&self) -> usize {
+        self.chunk_ids.len()
+    }
+
+    pub fn chunk_ids(&self) -> impl Iterator<Item = &ChunkId> {
+        self.chunk_ids.iter()
+    }
+
+    pub fn to_data_chunk(&self) -> anyhow::Result<DataChunk> {
+        let json = serde_json::to_string(self)?;
+        Ok(DataChunk::new(json.as_bytes().to_vec()))
+    }
+}
-- 
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