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use async_trait::async_trait;
use axum::extract::multipart::Field;
use tokio_stream::Stream;
use bytes::Bytes;
use serde::{Deserialize, Serialize};
use std::pin::Pin;
use std::fmt::Debug;
use std::num::NonZeroUsize;
pub mod file;
#[derive(Debug, Deserialize, Serialize)]
pub struct Metadata {
/// Content type of the file. If None, the content-type is considered undefined.
pub content_type: Option<String>,
/// The original filename that was passed.
pub filename: Option<String>,
/// The recorded length of the file.
pub length: Option<NonZeroUsize>,
}
impl From<&Field<'_>> for Metadata {
fn from(field: &Field<'_>) -> Self {
Self {
content_type: field.content_type()
.map(|i| i.to_owned()),
filename: field.file_name()
.map(|i| i.to_owned()),
length: None
}
}
}
#[derive(Debug, Clone, Copy)]
pub enum ErrorKind {
Backend,
Permission,
Json,
NotFound,
Other,
}
#[derive(Debug)]
pub struct MediaStoreError {
kind: ErrorKind,
source: Option<Box<dyn std::error::Error + Send + Sync>>,
msg: String,
}
impl MediaStoreError {
pub fn kind(&self) -> ErrorKind {
self.kind
}
}
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::Json => "failed to parse json",
ErrorKind::NotFound => "blob not found",
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<T>(
&self,
domain: &str,
metadata: Metadata,
content: T,
) -> Result<String>
where
T: tokio_stream::Stream<Item = std::result::Result<bytes::Bytes, axum::extract::multipart::MultipartError>> + Unpin + Send + Debug;
async fn read_streaming(
&self,
domain: &str,
filename: &str,
) -> Result<(Metadata, Pin<Box<dyn Stream<Item = std::io::Result<Bytes>> + Send>>)>;
async fn delete(&self, domain: &str, filename: &str) -> Result<()>;
}
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