| 1 | use std::{io::Error as IoError, path::PathBuf, pin::Pin}; |
| 2 | |
| 3 | use bytes::Bytes; |
| 4 | use futures::{Stream, stream::BoxStream}; |
| 5 | |
| 6 | use crate::{ |
| 7 | address::Addressable, |
| 8 | storage_fs::FileSystem, |
| 9 | }; |
| 10 | |
| 11 | #[derive(thiserror::Error, Debug)] |
| 12 | pub enum Error { |
| 13 | #[error("Unspecified Storage Error")] |
| 14 | Unspecified, |
| 15 | #[error("Storage IO: {0}")] |
| 16 | Io(#[from] IoError), |
| 17 | #[error("Object Not Found")] |
| 18 | NotFound, |
| 19 | } |
| 20 | |
| 21 | pub struct InnerStream { |
| 22 | stream: BoxStream<'static, Result<Bytes, std::io::Error>>, |
| 23 | } |
| 24 | |
| 25 | impl InnerStream { |
| 26 | pub fn new(stream: BoxStream<'static, Result<Bytes, std::io::Error>>) -> Self { |
| 27 | InnerStream { stream } |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | impl Stream for InnerStream { |
| 32 | type Item = Result<Bytes, std::io::Error>; |
| 33 | |
| 34 | fn poll_next( |
| 35 | self: Pin<&mut Self>, |
| 36 | cx: &mut std::task::Context<'_>, |
| 37 | ) -> std::task::Poll<Option<Self::Item>> { |
| 38 | Pin::new(&mut self.get_mut().stream).poll_next(cx) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | /// The storage trait needs to be implemented for accessing objects from the |
| 43 | /// platform. This API is based on registry/storage/driver/storagedriver.go in |
| 44 | /// the distribution codebase. |
| 45 | pub trait StorageIface: Sync + Send { |
| 46 | /// List a single directory of objects |
| 47 | // async fn list(&self, addr: &Address) -> Result<Vec<Object>, Error>; |
| 48 | // async fn stat(&self, addr: &Address) -> Result<Option<Object>, Error>; |
| 49 | // async fn read_bytes(&self, addr: &Address) -> Result<Option<Vec<u8>>, Error>; |
| 50 | /// Check if an object exists at the given address |
| 51 | fn exists<A>(&self, path: &A) -> impl Future<Output = Result<bool, Error>> + Send |
| 52 | where |
| 53 | A: Addressable + Send + Sync; |
| 54 | /// Write bytes to the address, truncating any existing object |
| 55 | fn write_all<A>( |
| 56 | &self, |
| 57 | path: &A, |
| 58 | bytes: &[u8], |
| 59 | ) -> impl Future<Output = Result<(), Error>> + Send |
| 60 | where |
| 61 | A: Addressable + Send + Sync; |
| 62 | |
| 63 | /// write bytes to a file that has already been created |
| 64 | fn write<A>(&self, path: &A, bytes: &[u8]) -> impl Future<Output = Result<(), Error>> + Send |
| 65 | where |
| 66 | A: Addressable + Send + Sync; |
| 67 | |
| 68 | fn mv<A, B>(&self, src: &A, dst: &B) -> impl Future<Output = Result<(), Error>> + Send |
| 69 | where |
| 70 | A: Addressable + Send + Sync, |
| 71 | B: Addressable + Send + Sync; |
| 72 | // fn mv (&self, )std::future::Future<Output = ()> + Send |
| 73 | fn read<A>(&self, src: &A) -> impl Future<Output = Result<InnerStream, Error>> + Send |
| 74 | where |
| 75 | A: Addressable + Send + Sync; |
| 76 | |
| 77 | fn read_bytes<A>(&self, src: &A) -> impl Future<Output = Result<Bytes, Error>> + Send |
| 78 | where |
| 79 | A: Addressable + Send + Sync; |
| 80 | |
| 81 | fn delete<A>(&self, src: &A) -> impl Future<Output = Result<(), Error>> + Send |
| 82 | where |
| 83 | A: Addressable + Send + Sync; |
| 84 | } |
| 85 | |
| 86 | #[derive(Debug, Clone)] |
| 87 | pub enum Storage { |
| 88 | FileSystem { base: PathBuf }, |
| 89 | } |
| 90 | |
| 91 | impl Storage { |
| 92 | pub fn init(&self) -> Result<(), Error> { |
| 93 | match self { |
| 94 | Storage::FileSystem { base } => FileSystem { base: base.clone() }.init(), |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | pub fn inner(&self) -> impl StorageIface { |
| 99 | match self { |
| 100 | Storage::FileSystem { base } => FileSystem { base: base.clone() }, |
| 101 | } |
| 102 | } |
| 103 | } |