116 lines
2.9 KiB
Rust
116 lines
2.9 KiB
Rust
/*
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*
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* This abstraction goal is to leverage all the semantic of Garage K2V+S3,
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* to be as tailored as possible to it ; it aims to be a zero-cost abstraction
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* compared to when we where directly using the K2V+S3 client.
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*
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* My idea: we can encapsulate the causality token
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* into the object system so it is not exposed.
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*/
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use futures::future::BoxFuture;
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pub mod in_memory;
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pub mod garage;
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pub enum Selector<'a> {
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Range{ begin: &'a str, end: &'a str },
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Filter(u64),
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}
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pub enum Alternative {
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Tombstone,
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Value(Vec<u8>),
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}
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type ConcurrentValues = Vec<Alternative>;
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#[derive(Debug)]
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pub enum StorageError {
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NotFound,
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Internal,
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}
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impl std::fmt::Display for StorageError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.write_str("Storage Error: ");
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match self {
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Self::NotFound => f.write_str("Item not found"),
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Self::Internal => f.write_str("An internal error occured"),
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}
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}
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}
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impl std::error::Error for StorageError {}
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pub struct Engine {
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pub bucket: String,
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pub builders: Builder,
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}
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impl Clone for Engine {
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fn clone(&self) -> Self {
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Engine {
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bucket: "test".into(),
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builders: Box::new(in_memory::FullMem{})
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}
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}
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}
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impl std::fmt::Debug for Engine {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("Engine").field("bucket", &self.bucket).finish()
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}
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}
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// Utils
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pub type AsyncResult<'a, T> = BoxFuture<'a, Result<T, StorageError>>;
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pub trait IBuilder {
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fn row_store(&self) -> Result<RowStore, StorageError>;
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fn blob_store(&self) -> Result<BlobStore, StorageError>;
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}
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pub type Builder = Box<dyn IBuilder + Send + Sync>;
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// ------ Row
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pub trait IRowStore
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{
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fn new_row(&self, partition: &str, sort: &str) -> RowRef;
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}
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pub type RowStore = Box<dyn IRowStore + Sync + Send>;
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pub trait IRowRef
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{
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fn set_value(&self, content: Vec<u8>) -> RowValue;
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fn fetch(&self) -> AsyncResult<RowValue>;
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fn rm(&self) -> AsyncResult<()>;
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fn poll(&self) -> AsyncResult<Option<RowValue>>;
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}
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pub type RowRef = Box<dyn IRowRef>;
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pub trait IRowValue
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{
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fn to_ref(&self) -> RowRef;
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fn content(&self) -> ConcurrentValues;
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fn push(&self) -> AsyncResult<()>;
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}
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pub type RowValue = Box<dyn IRowValue>;
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// ------- Blob
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pub trait IBlobStore
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{
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fn new_blob(&self, key: &str) -> BlobRef;
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fn list(&self) -> AsyncResult<Vec<BlobRef>>;
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}
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pub type BlobStore = Box<dyn IBlobStore + Send + Sync>;
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pub trait IBlobRef
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{
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fn set_value(&self, content: Vec<u8>) -> BlobValue;
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fn fetch(&self) -> AsyncResult<BlobValue>;
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fn copy(&self, dst: &BlobRef) -> AsyncResult<()>;
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fn rm(&self) -> AsyncResult<()>;
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}
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pub type BlobRef = Box<dyn IBlobRef>;
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pub trait IBlobValue {
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fn to_ref(&self) -> BlobRef;
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fn push(&self) -> AsyncResult<()>;
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}
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pub type BlobValue = Box<dyn IBlobValue>;
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