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use crate::chunkid::ChunkId;
use serde::{Deserialize, Serialize};
use std::default::Default;
/// Store an arbitrary chunk of data.
///
/// The data is just arbitrary binary data.
///
/// A chunk also contains its associated metadata, except its
/// identifier.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DataChunk {
data: Vec<u8>,
}
impl DataChunk {
/// Construct a new chunk.
pub fn new(data: Vec<u8>) -> Self {
Self { data }
}
/// Return a chunk's data.
pub fn data(&self) -> &[u8] {
&self.data
}
}
#[derive(Default, Debug, Serialize, Deserialize)]
pub struct GenerationChunk {
chunk_ids: Vec<ChunkId>,
}
/// All the errors that may be returned for `GenerationChunk` operations.
#[derive(Debug, thiserror::Error)]
pub enum GenerationChunkError {
#[error(transparent)]
Utf8Error(#[from] std::str::Utf8Error),
#[error(transparent)]
SerdeJsonError(#[from] serde_json::Error),
}
/// A result from a chunk operation.
pub type GenerationChunkResult<T> = Result<T, GenerationChunkError>;
impl GenerationChunk {
pub fn new(chunk_ids: Vec<ChunkId>) -> Self {
Self { chunk_ids }
}
pub fn from_data_chunk(chunk: &DataChunk) -> GenerationChunkResult<Self> {
let data = chunk.data();
let data = std::str::from_utf8(data)?;
Ok(serde_json::from_str(data)?)
}
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) -> GenerationChunkResult<DataChunk> {
let json = serde_json::to_string(self)?;
Ok(DataChunk::new(json.as_bytes().to_vec()))
}
}
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