Dont store blobs in database, create StorageProvider

.gitignore

@@ -1,4 +1,5 @@
 /target
 .env
 .vscode
-test.db
+test.db
+/registry

Cargo.lock

@@ -231,6 +231,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.70"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7de8ce5e0f9f8d88245311066a578d72b7af3e7088f32783804676302df237e4"
+
 [[package]]
 name = "async-trait"
 version = "0.1.68"
@@ -613,12 +619,14 @@ name = "docker-registry"
 version = "0.1.0"
 dependencies = [
  "actix-web",
+ "anyhow",
  "async-trait",
  "bytes",
  "chrono",
  "clap",
  "futures",
  "jws",
+ "pin-project-lite",
  "qstring",
  "regex",
  "serde",

Cargo.toml

@@ -31,3 +31,5 @@ async-trait = "0.1.68"
 futures = "0.3.28"
 qstring = "0.7.2"
 sha256 = "1.1.2"
+pin-project-lite = "0.2.9"
+anyhow = "1.0.70"

docs/storage-providers/filesystem-provider.md

@@ -0,0 +1,2 @@
+# Filesystem Provider
+The filesystem storage provider stores files in a directory. A database is still required when using this provider since the only thing thats stored on the filesystem are the layer's binary data.

docs/todo.md

@@ -0,0 +1,5 @@
+- [ ] slashes in repo names
+- [ ] Simple auth
+- [ ] postgresql
+- [ ] prometheus metrics
+- [ ] streaming layer bytes into providers

rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "stable"

src/api/blobs.rs

@@ -3,28 +3,33 @@ use actix_web::{HttpResponse, get, HttpRequest, web, head, delete};
 use crate::app_state::AppState;
 
 use crate::database::Database;
+use crate::storage::filesystem::FilesystemDriver;
 
 #[head("/{digest}")]
 pub async fn digest_exists(path: web::Path<(String, String)>, state: web::Data<AppState>) -> HttpResponse {
     let (_name, layer_digest) = (path.0.to_owned(), path.1.to_owned());
 
-    let database = &state.database;
-    if let Some(bytes) = database.get_digest(&layer_digest).await.unwrap() {
-        HttpResponse::Ok()
-            .insert_header(("Content-Length", bytes.len()))
-            .insert_header(("Docker-Content-Digest", layer_digest))
-            .finish()
-    } else {
-        HttpResponse::NotFound().finish()
+    let storage = state.storage.lock().await;
+
+    if storage.has_digest(&layer_digest).await.unwrap() {
+        if let Some(size) = storage.digest_length(&layer_digest).await.unwrap() {
+            return HttpResponse::Ok()
+                .insert_header(("Content-Length", size))
+                .insert_header(("Docker-Content-Digest", layer_digest))
+                .finish();
+        }
     }
+
+    HttpResponse::NotFound()
+        .finish()
 }
 
 #[get("/{digest}")]
 pub async fn pull_digest(path: web::Path<(String, String)>, state: web::Data<AppState>) -> HttpResponse {
     let (_name, layer_digest) = (path.0.to_owned(), path.1.to_owned());
 
-    let database = &state.database;
-    if let Some(bytes) = database.get_digest(&layer_digest).await.unwrap() {
+    let storage = state.storage.lock().await;
+    if let Some(bytes) = storage.get_digest(&layer_digest).await.unwrap() {
         HttpResponse::Ok()
             .insert_header(("Content-Length", bytes.len()))
             .insert_header(("Docker-Content-Digest", layer_digest))

src/api/uploads.rs

@@ -1,11 +1,13 @@
 use actix_web::{HttpResponse, HttpRequest, post, web, patch, put, delete, get};
 use bytes::{BytesMut, Bytes, BufMut};
 use qstring::QString;
+use tokio::io::AsyncWriteExt;
 use tracing::{debug};
 
 use crate::app_state::AppState;
 
 use crate::database::Database;
+use crate::storage::filesystem::FilesystemDriver;
 
 /// Starting an upload
 #[post("/")]
@@ -31,25 +33,21 @@ pub async fn chunked_upload_layer(body: Bytes, path: web::Path<(String, String)>
 
     debug!("Read body of size: {}", body.len());
 
-    let database = &state.database;
-    let (starting, ending) = match database.get_digest(&layer_uuid).await.unwrap() {
-        Some(current_bytes) => {
-            let mut combined = BytesMut::new();
-            let body_size = body.len();
-            let current_size = current_bytes.len();
+    let storage = state.storage.lock().await;
 
-            combined.put(current_bytes);
-            combined.put(body);
+    let current_size = storage.digest_length(&layer_uuid).await.unwrap();
+    let (starting, ending) = if let Some(current_size) = current_size {
+        let body_size = body.len();
 
-            database.save_digest(&layer_uuid, &combined.into()).await.unwrap();
+        storage.save_digest(&layer_uuid, &body, true).await.unwrap();
 
-            (current_size, current_size + body_size)
-        },
-        None => {
-            let body_size = body.len();
-            database.save_digest(&layer_uuid, &body.into()).await.unwrap();
-            (0, body_size)
-        }
+        (current_size, current_size + body_size)
+    } else {
+        let body_size = body.len();
+
+        storage.save_digest(&layer_uuid, &body, true).await.unwrap();
+
+        (0, body_size)
     };
 
     debug!("s={}, e={}, uuid={}, uri={}", starting, ending, layer_uuid, full_uri);
@@ -69,20 +67,15 @@ pub async fn finish_chunked_upload(body: Bytes, path: web::Path<(String, String)
     let qs = QString::from(req.query_string());
     let digest = qs.get("digest").unwrap();
 
-    let database = &state.database;
+    let storage = state.storage.lock().await;
     if !body.is_empty() {
-        let current_bytes = database.get_digest(&layer_uuid).await.unwrap().unwrap();
-        let mut combined = BytesMut::new();
-
-        combined.put(current_bytes);
-        combined.put(body);
-
-        database.save_digest(&layer_uuid, &combined.into()).await.unwrap();
+        storage.save_digest(&layer_uuid, &body, true).await.unwrap();
     } else {
         // TODO: Validate layer with all digest params
     }
 
-    database.replace_digest(&layer_uuid, &digest).await.unwrap();
+    storage.replace_digest(&layer_uuid, &digest).await.unwrap();
+    debug!("Completed upload, finished uuid {} to digest {}", layer_uuid, digest);
 
     HttpResponse::Created()
         .insert_header(("Location", format!("/v2/{}/blobs/{}", name, digest)))
@@ -95,8 +88,8 @@ pub async fn finish_chunked_upload(body: Bytes, path: web::Path<(String, String)
 pub async fn cancel_upload(path: web::Path<(String, String)>, state: web::Data<AppState>) -> HttpResponse {
     let (_name, layer_uuid) = (path.0.to_owned(), path.1.to_owned());
 
-    let database = &state.database;
-    database.delete_digest(&layer_uuid).await.unwrap();
+    let storage = state.storage.lock().await;
+    storage.delete_digest(&layer_uuid).await.unwrap();
     
     // I'm not sure what this response should be, its not specified in the registry spec.
     HttpResponse::Ok()
@@ -107,15 +100,8 @@ pub async fn cancel_upload(path: web::Path<(String, String)>, state: web::Data<A
 pub async fn check_upload_status(path: web::Path<(String, String)>, state: web::Data<AppState>) -> HttpResponse {
     let (name, layer_uuid) = (path.0.to_owned(), path.1.to_owned());
     
-    let database = &state.database;
-    let ending = match database.get_digest(&layer_uuid).await.unwrap() {
-        Some(current_bytes) => {
-            current_bytes.len()
-        },
-        None => {
-            0
-        }
-    };
+    let storage = state.storage.lock().await;
+    let ending = storage.digest_length(&layer_uuid).await.unwrap().unwrap_or(0);
 
     HttpResponse::Created()
         .insert_header(("Location", format!("/v2/{}/blobs/uploads/{}", name, layer_uuid)))

src/app_state.rs

@@ -1,13 +1,22 @@
 use sqlx::{Sqlite, Pool};
 
+use crate::storage::StorageDriver;
+
+use tokio::sync::Mutex;
+
 pub struct AppState {
     pub database: Pool<Sqlite>,
+    pub storage: Mutex<Box<dyn StorageDriver>>,
 }
 
 impl AppState {
-    pub fn new(database: Pool<Sqlite>) -> Self {
+    pub fn new/* <S> */(database: Pool<Sqlite>, storage: Mutex<Box<dyn StorageDriver>>) -> Self
+    /* where
+        S: StorageDriver, */
+    {
         Self {
             database,
+            storage
         }
     }
 }

src/database/mod.rs

@@ -17,7 +17,7 @@ pub trait Database {
     /// Create the tables in the database
     async fn create_schema(&self) -> sqlx::Result<()>;
     /// Get the digest bytes
-    async fn get_digest(&self, digest: &str) -> sqlx::Result<Option<Bytes>>;
+    /* async fn get_digest(&self, digest: &str) -> sqlx::Result<Option<Bytes>>;
     /// Get the length of the digest
     async fn digest_length(&self, digest: &str) -> sqlx::Result<usize>;
     /// Save digest bytes
@@ -25,9 +25,7 @@ pub trait Database {
     /// Delete digest
     async fn delete_digest(&self, digest: &str) -> sqlx::Result<()>;
     /// Replace the uuid with a digest
-    async fn replace_digest(&self, uuid: &str, new_digest: &str) -> sqlx::Result<()>;
-    async fn link_manifest_layer(&self, manifest_digest: &str, layer_digest: &str) -> sqlx::Result<()>;
-    async fn unlink_manifest_layer(&self, manifest_digest: &str, layer_digest: &str) -> sqlx::Result<()>;
+    async fn replace_digest(&self, uuid: &str, new_digest: &str) -> sqlx::Result<()>; */
 
     // Tag related functions
 
@@ -48,7 +46,10 @@ pub trait Database {
     /// Save a manifest's content.
     async fn save_manifest(&self, repository: &str, digest: &str, content: &str) -> sqlx::Result<()>;
     /// Delete a manifest
-    async fn delete_manifest(&self, repository: &str, digest: &str) -> sqlx::Result<()>;
+    /// Returns digests that this manifest pointed to.
+    async fn delete_manifest(&self, repository: &str, digest: &str) -> sqlx::Result<Vec<String>>;
+    async fn link_manifest_layer(&self, manifest_digest: &str, layer_digest: &str) -> sqlx::Result<()>;
+    async fn unlink_manifest_layer(&self, manifest_digest: &str, layer_digest: &str) -> sqlx::Result<()>;
 
     // Repository related functions
 
@@ -70,7 +71,7 @@ impl Database for Pool<Sqlite> {
         Ok(())
     }
 
-    async fn get_digest(&self, digest: &str) -> sqlx::Result<Option<Bytes>> {
+    /* async fn get_digest(&self, digest: &str) -> sqlx::Result<Option<Bytes>> {
         // Handle RowNotFound errors
         let row: (Vec<u8>, ) = match sqlx::query_as("SELECT blob FROM layer_blobs WHERE digest = ?")
                 .bind(digest)
@@ -134,7 +135,7 @@ impl Database for Pool<Sqlite> {
         debug!("Replaced digest uuid {} to digest {}", uuid, new_digest);
 
         Ok(())
-    }
+    } */
 
     async fn link_manifest_layer(&self, manifest_digest: &str, layer_digest: &str) -> sqlx::Result<()> {
         sqlx::query("INSERT INTO manifest_layers(manifest, layer_digest) VALUES (?, ?)")
@@ -269,7 +270,7 @@ impl Database for Pool<Sqlite> {
         Ok(())
     }
 
-    async fn delete_manifest(&self, repository: &str, digest: &str) -> sqlx::Result<()> {
+    async fn delete_manifest(&self, repository: &str, digest: &str) -> sqlx::Result<Vec<String>> {
         sqlx::query("DELETE FROM image_manifests where digest = ? AND repository = ?")
             .bind(digest)
             .bind(repository)
@@ -283,11 +284,8 @@ impl Database for Pool<Sqlite> {
         
         debug!("Unlinked manifest {} from all linked layers", digest);
 
-        for row in rows.into_iter() {
-            let layer_digest = row.0;
 
-            self.delete_digest(&layer_digest).await?;
-        }
+        let digests = rows.into_iter().map(|r| r.0).collect();
 
         debug!("Deleted all digests for manifest {}", digest);
 
@@ -297,7 +295,7 @@ impl Database for Pool<Sqlite> {
 
         debug!("Deleted all image tags for manifest {}", digest);
 
-        Ok(())
+        Ok(digests)
     }
 
     async fn save_repository(&self, repository: &str) -> sqlx::Result<()> {

src/main.rs

@@ -2,16 +2,21 @@ mod api;
 mod app_state;
 mod database;
 mod dto;
+mod storage;
 
 use actix_web::{web, App, HttpServer};
 use actix_web::middleware::Logger;
 
 use sqlx::sqlite::SqlitePoolOptions;
+use tokio::sync::Mutex;
 use tracing::{debug, Level};
 
 use app_state::AppState;
 use database::Database;
 
+use crate::storage::StorageDriver;
+use crate::storage::filesystem::FilesystemDriver;
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     let pool = SqlitePoolOptions::new()
@@ -22,7 +27,9 @@ async fn main() -> std::io::Result<()> {
 
     //let db_conn: Mutex<dyn Database> = Mutex::new(SqliteConnection::establish("test.db").unwrap());
     //let db = Mutex::new(Database::new_sqlite_connection("test.db").unwrap());
-    let state = web::Data::new(AppState::new(pool));
+    let storage_driver: Mutex<Box<dyn StorageDriver>> = Mutex::new(Box::new(FilesystemDriver::new("registry/blobs")));
+
+    let state = web::Data::new(AppState::new(pool, storage_driver));
 
     tracing_subscriber::fmt()
         .with_max_level(Level::DEBUG)

src/storage/filesystem.rs

@@ -0,0 +1,107 @@
+use std::{path::Path, io::ErrorKind};
+
+use anyhow::Context;
+use async_trait::async_trait;
+use bytes::Bytes;
+use tokio::{fs, io::{AsyncWriteExt, AsyncReadExt}, task::spawn_blocking};
+use tracing::debug;
+
+use super::StorageDriver;
+
+pub struct FilesystemDriver {
+    storage_path: String,
+}
+
+impl FilesystemDriver {
+    pub fn new(storage_path: &str) -> Self {
+        Self {
+            storage_path: storage_path.to_string(),
+        }
+    }
+
+    fn get_digest_path(&self, digest: &str) -> String {
+        format!("{}/{}", self.storage_path, digest)
+    }
+}
+
+#[async_trait]
+impl StorageDriver for FilesystemDriver {
+    async fn has_digest(&self, digest: &str) -> anyhow::Result<bool> {
+        let path = self.get_digest_path(digest);
+
+        spawn_blocking(move || {
+            return Path::new(&path).exists()
+        }).await.context("FilesystemDriver: Failure to spawn blocking thread to check digest")
+    }
+
+    async fn get_digest(&self, digest: &str) -> anyhow::Result<Option<Bytes>> {
+        let mut file = match fs::File::open(self.get_digest_path(digest))
+            .await {
+            
+            Ok(f) => f,
+            Err(e) => match e.kind() {
+                ErrorKind::NotFound => {
+                    return Ok(None)
+                },
+                _ => {
+                    return Err(e)
+                        .context("FilesystemDriver: Failure to open digest file");
+                }
+            }
+        };
+
+        let mut buf = Vec::new();
+        file.read_to_end(&mut buf).await?;
+
+        Ok(Some(Bytes::from_iter(buf)))
+    }
+
+    async fn digest_length(&self, digest: &str) -> anyhow::Result<Option<usize>> {
+        let file = match fs::File::open(self.get_digest_path(digest))
+            .await {
+            
+            Ok(f) => f,
+            Err(e) => match e.kind() {
+                ErrorKind::NotFound => {
+                    return Ok(None)
+                },
+                _ => {
+                    return Err(e)
+                        .context("FilesystemDriver: Failure to open digest file");
+                }
+            }
+        };
+
+        Ok(Some(file.metadata().await?.len() as usize))
+    }
+
+    async fn save_digest(&self, digest: &str, bytes: &Bytes, append: bool) -> anyhow::Result<()> {
+        let path = self.get_digest_path(digest);
+        let mut file = fs::OpenOptions::new()
+            .write(true)
+            .append(append)
+            .create(true)
+            .open(path).await?;
+
+        file.write_all(&bytes).await?;
+
+        Ok(())
+    }
+
+    async fn delete_digest(&self, digest: &str) -> anyhow::Result<()> {
+        let path = self.get_digest_path(digest);
+        fs::remove_file(path).await?;
+
+        Ok(())
+    }
+
+    async fn replace_digest(&self, uuid: &str, digest: &str) -> anyhow::Result<()> {
+        let path = self.get_digest_path(uuid);
+        let path = Path::new(&path);
+        let parent = path.clone().parent().unwrap();
+
+        fs::rename(path, format!("{}/{}", parent.as_os_str().to_str().unwrap(), digest)).await?;
+
+        Ok(())
+    }
+}

src/storage/mod.rs

@@ -0,0 +1,15 @@
+pub mod filesystem;
+
+use async_trait::async_trait;
+use bytes::Bytes;
+use tokio::io::{AsyncWrite, AsyncRead};
+
+#[async_trait]
+pub trait StorageDriver: Send/* : AsyncWrite + AsyncRead */ {
+    async fn has_digest(&self, digest: &str) -> anyhow::Result<bool>;
+    async fn get_digest(&self, digest: &str) -> anyhow::Result<Option<Bytes>>;
+    async fn digest_length(&self, digest: &str) -> anyhow::Result<Option<usize>>;
+    async fn save_digest(&self, digest: &str, bytes: &Bytes, append: bool) -> anyhow::Result<()>;
+    async fn delete_digest(&self, digest: &str) -> anyhow::Result<()>;
+    async fn replace_digest(&self, uuid: &str, digest: &str) -> anyhow::Result<()>;
+}