From 43e1a12b5bce11b4a28a53acca243e35c2be6d3e Mon Sep 17 00:00:00 2001
From: evuez <julien@mulga.net>
Date: Wed, 3 Apr 2024 22:43:16 +0200
Subject: Initial commit

---
 src/server/storage/backend.rs      | 26 +++++++++++++++
 src/server/storage/backend/disk.rs | 65 ++++++++++++++++++++++++++++++++++++++
 src/server/storage/record.rs       | 56 ++++++++++++++++++++++++++++++++
 3 files changed, 147 insertions(+)
 create mode 100644 src/server/storage/backend.rs
 create mode 100644 src/server/storage/backend/disk.rs
 create mode 100644 src/server/storage/record.rs

(limited to 'src/server/storage')

diff --git a/src/server/storage/backend.rs b/src/server/storage/backend.rs
new file mode 100644
index 0000000..8ae62b4
--- /dev/null
+++ b/src/server/storage/backend.rs
@@ -0,0 +1,26 @@
+pub mod disk;
+
+use super::Result;
+use crate::server::blobref::BlobRef;
+
+pub fn factory<'a, T: StorageBackend>(config: &T::Config) -> impl Fn(&'a str) -> T + '_ {
+    |bucket: &str| T::new(bucket, config)
+}
+
+pub trait StorageBackend: Iterator {
+    type Config;
+
+    fn new(bucket: &str, config: &Self::Config) -> Self;
+
+    fn put(&self, data: &[u8]) -> Result<BlobRef>;
+
+    fn get(&self, blobref: &BlobRef) -> Result<Option<Vec<u8>>>;
+
+    fn exists(&self, blobref: &BlobRef) -> bool {
+        if let Ok(Some(_)) = self.get(blobref) {
+            return true;
+        }
+
+        false
+    }
+}
diff --git a/src/server/storage/backend/disk.rs b/src/server/storage/backend/disk.rs
new file mode 100644
index 0000000..3137376
--- /dev/null
+++ b/src/server/storage/backend/disk.rs
@@ -0,0 +1,65 @@
+use super::StorageBackend;
+use crate::server::blobref::BlobRef;
+use crate::server::storage::{Error, Result};
+use log::debug;
+use serde::{Deserialize, Serialize};
+use std::{fs, io::ErrorKind, path::PathBuf};
+
+pub struct Disk {
+    bucket: String,
+    pub root: PathBuf,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Config {
+    pub root: PathBuf,
+}
+
+impl StorageBackend for Disk {
+    type Config = Config;
+
+    fn new(bucket: &str, config: &Self::Config) -> Self {
+        Self {
+            bucket: bucket.to_string(),
+            root: config.root.clone().join(bucket),
+        }
+    }
+
+    fn put(&self, data: &[u8]) -> Result<BlobRef> {
+        let blobref = BlobRef::for_bytes(data);
+        debug!("Preparing {blobref}");
+
+        if !self.exists(&blobref) {
+            let blobpath = self.root.join(blobref.path());
+            let blobdir = blobpath.parent().expect("blobpath should have a parent");
+            debug!("Writing blob to {blobpath:?}");
+
+            fs::create_dir_all(blobdir).map_err(|_| Error::Io)?;
+            fs::write(blobpath, data).map_err(|_| Error::Io)?;
+        }
+
+        Ok(blobref)
+    }
+
+    fn get(&self, blobref: &BlobRef) -> Result<Option<Vec<u8>>> {
+        let blobpath = self.root.join(blobref.path());
+
+        match fs::read(blobpath) {
+            Ok(contents) => Ok(Some(contents)),
+            Err(e) if e.kind() == ErrorKind::NotFound => Ok(None),
+            Err(e) => Err(Error::Io),
+        }
+    }
+
+    fn exists(&self, blobref: &BlobRef) -> bool {
+        self.root.join(blobref.path()).exists()
+    }
+}
+
+impl Iterator for Disk {
+    type Item = BlobRef;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        todo!()
+    }
+}
diff --git a/src/server/storage/record.rs b/src/server/storage/record.rs
new file mode 100644
index 0000000..ab5c977
--- /dev/null
+++ b/src/server/storage/record.rs
@@ -0,0 +1,56 @@
+use crate::server::{attrs::Attr, blobref::BlobRef};
+use rand::{thread_rng, Rng};
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub(super) struct Anchor {
+    rand: u64,
+    #[serde(with = "time::serde::rfc3339")]
+    created_at: OffsetDateTime,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub(super) struct Patch {
+    pub anchor: BlobRef,
+    pub changes: Vec<Change>,
+    #[serde(with = "time::serde::rfc3339")]
+    created_at: OffsetDateTime,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+// #[allow(clippy::enum_variant_names)]
+pub(super) enum Change {
+    AddChunk {
+        blobref: BlobRef,
+        offset: u64,
+        size: usize,
+    },
+    SetAttr(Attr),
+}
+
+impl Anchor {
+    pub(super) fn new() -> Self {
+        Self {
+            rand: thread_rng().gen(),
+            created_at: OffsetDateTime::now_utc(),
+        }
+    }
+}
+
+impl Patch {
+    pub(super) fn new(anchor: BlobRef) -> Self {
+        Self {
+            anchor,
+            changes: Vec::new(),
+            created_at: OffsetDateTime::now_utc(),
+        }
+    }
+
+    pub(super) fn add_change(&mut self, change: Change) {
+        self.changes.push(change);
+    }
+}
-- 
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