treewide: rewrite using Axum

Axum has streaming bodies and allows to write simpler code. It also
helps enforce stronger types and looks much more neat.

This allows me to progress on the media endpoint and add streaming
reads and writes to the MediaStore trait.

Metrics are temporarily not implemented. Everything else was
preserved, and the tests still pass, after adjusting for new calling
conventions.

TODO: create method routers for protocol endpoints

3 files changed, 137 insertions, 27 deletions

diff --git a/kittybox-rs/src/media/mod.rs b/kittybox-rs/src/media/mod.rs
index 0d46e0c..d18cf34 100644
--- a/kittybox-rs/src/media/mod.rs
+++ b/kittybox-rs/src/media/mod.rs
@@ -1,27 +1,25 @@
-use futures_util::StreamExt;
 use bytes::buf::Buf;
-use warp::{Filter, Rejection, Reply, multipart::{FormData, Part}};
-
-pub fn query() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
-    warp::get()
-        .and(crate::util::require_host())
-        .map(|host| "media endpoint query...")
-}
+use futures_util::StreamExt;
+use axum::{
+    extract::{Host, Extension, Multipart},
+    response::{Response, IntoResponse, Json}
+};
 
-pub fn options() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
-    warp::options()
-        .map(|| warp::reply::json::<Option<()>>(&None))
-        .with(warp::reply::with::header("Allow", "GET, POST"))
-}
+pub mod storage;
+use storage::{MediaStore, MediaStoreError};
 
-pub fn upload() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
+/*pub fn upload() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
     warp::post()
         .and(crate::util::require_host())
-        .and(warp::multipart::form().max_length(1024*1024*150/*mb*/))
+        .and(warp::multipart::form().max_length(1024 * 1024 * 150 /*mb*/))
         .and_then(|host, mut form: FormData| async move {
             // TODO get rid of the double unwrap() here
             let file: Part = form.next().await.unwrap().unwrap();
-            log::debug!("Uploaded: {:?}, type: {:?}", file.filename(), file.content_type());
+            log::debug!(
+                "Uploaded: {:?}, type: {:?}",
+                file.filename(),
+                file.content_type()
+            );
 
             let mut data = file.stream();
             while let Some(buf) = data.next().await {
@@ -29,18 +27,16 @@ pub fn upload() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clo
                 log::debug!("buffer length: {:?}", buf.map(|b| b.remaining()));
             }
             Ok::<_, warp::Rejection>(warp::reply::with_header(
-                warp::reply::with_status(
-                    "",
-                    warp::http::StatusCode::CREATED
-                ),
+                warp::reply::with_status("", warp::http::StatusCode::CREATED),
                 "Location",
-                "./awoo.png"
+                "./awoo.png",
             ))
         })
-}
-
-pub fn media() -> impl Filter<Extract = (impl Reply,), Error = Rejection> + Clone {
-    upload()
-        .or(query())
-        .or(options())
+}*/
+pub async fn upload<S: MediaStore>(
+    Host(host): Host,
+    upload: Multipart,
+    Extension(db): Extension<S>
+) -> Response {
+    todo!()
 }
diff --git a/kittybox-rs/src/media/storage/file.rs b/kittybox-rs/src/media/storage/file.rs
new file mode 100644
index 0000000..8c0ddf0
--- /dev/null
+++ b/kittybox-rs/src/media/storage/file.rs
@@ -0,0 +1,61 @@
+use super::{ErrorKind, MediaStore, MediaStoreError, Result};
+use async_trait::async_trait;
+use std::path::PathBuf;
+use tokio::fs::OpenOptions;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+
+#[derive(Clone)]
+pub struct FileStore {
+    base: PathBuf,
+}
+
+impl From<tokio::io::Error> for MediaStoreError {
+    fn from(source: tokio::io::Error) -> Self {
+        Self {
+            source: Some(Box::new(source)),
+            msg: "file I/O error".to_owned(),
+            kind: ErrorKind::Backend,
+        }
+    }
+}
+
+#[async_trait]
+impl MediaStore for FileStore {
+    async fn write_streaming(
+        &self, domain: url::Host, filename: &str,
+        content: axum::extract::multipart::Field<'_>
+    ) -> Result<()> {
+        todo!()
+    }
+
+    async fn read_streaming(&self, domain: url::Host, filename: &str) -> Result<tokio_util::io::ReaderStream<Box<dyn tokio::io::AsyncRead>>> {
+        todo!()
+    }
+    
+    async fn write(&self, domain: url::Host, filename: &str, content: &[u8]) -> Result<()> {
+        let path = self.base.join(format!("{}/{}", domain, filename));
+
+        let mut file = OpenOptions::new()
+            .create_new(true)
+            .write(true)
+            .open(path)
+            .await?;
+
+        Ok(file.write_all(content).await?)
+    }
+
+    async fn read(&self, domain: url::Host, filename: &str) -> Result<Vec<u8>> {
+        let path = self.base.join(format!("{}/{}", domain, filename));
+
+        let mut file = OpenOptions::new().read(true).open(path).await?;
+
+        let mut buf: Vec<u8> = Vec::default();
+        file.read_to_end(&mut buf).await?;
+
+        Ok(buf)
+    }
+
+    async fn delete(&self, domain: url::Host, filename: &str) -> Result<()> {
+        todo!()
+    }
+}
diff --git a/kittybox-rs/src/media/storage/mod.rs b/kittybox-rs/src/media/storage/mod.rs
new file mode 100644
index 0000000..e9b01f9
--- /dev/null
+++ b/kittybox-rs/src/media/storage/mod.rs
@@ -0,0 +1,53 @@
+use async_trait::async_trait;
+
+pub mod file;
+
+#[derive(Debug, Clone, Copy)]
+pub enum ErrorKind {
+    Backend,
+    Permission,
+    Conflict,
+    Other,
+}
+
+#[derive(Debug)]
+pub struct MediaStoreError {
+    kind: ErrorKind,
+    source: Option<Box<dyn std::error::Error + Send + Sync>>,
+    msg: String,
+}
+
+impl std::error::Error for MediaStoreError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        self.source
+            .as_ref()
+            .map(|i| i.as_ref() as &dyn std::error::Error)
+    }
+}
+
+impl std::fmt::Display for MediaStoreError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}: {}",
+            match self.kind {
+                ErrorKind::Backend => "media storage backend error",
+                ErrorKind::Permission => "permission denied",
+                ErrorKind::Conflict => "conflict with existing data",
+                ErrorKind::Other => "unknown media storage error",
+            },
+            self.msg
+        )
+    }
+}
+
+pub type Result<T> = std::result::Result<T, MediaStoreError>;
+
+#[async_trait]
+pub trait MediaStore: 'static + Send + Sync + Clone {
+    async fn write_streaming(&self, domain: url::Host, filename: &str, content: axum::extract::multipart::Field<'_>) -> Result<()>;
+    async fn write(&self, domain: url::Host, filename: &str, content: &[u8]) -> Result<()>;
+    async fn read_streaming(&self, domain: url::Host, filename: &str) -> Result<tokio_util::io::ReaderStream<Box<dyn tokio::io::AsyncRead>>>;
+    async fn read(&self, domain: url::Host, filename: &str) -> Result<Vec<u8>>;
+    async fn delete(&self, domain: url::Host, filename: &str) -> Result<()>;
+}