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use educe::Educe; use futures::{pin_mut, stream, AsyncReadExt, FutureExt, Stream, StreamExt}; use serde::{Deserialize, Serialize}; use serde_closure::FnMutNamed; use serde_json::Error as InternalJsonError; use std::{ error, fmt::{self, Debug, Display}, io::{self, Cursor}, marker::PhantomData }; use amadeus_core::{ file::{File, Page, Partition}, into_par_stream::IntoDistributedStream, par_stream::DistributedStream, util::{DistParStream, ResultExpandIter}, Source }; use super::{SerdeData, SerdeDeserialize}; #[derive(Educe)] #[educe(Clone, Debug)] pub struct Json<File, Row> where File: amadeus_core::file::File, Row: SerdeData, { partitions: Vec<File::Partition>, marker: PhantomData<fn() -> Row>, } impl<F, Row> Json<F, Row> where F: File, Row: SerdeData, { pub async fn new(file: F) -> Result<Self, <Self as Source>::Error> { Ok(Self { partitions: file.partitions().await.map_err(JsonError::File)?, marker: PhantomData, }) } } type Error<P, E> = JsonError<E, <P as Partition>::Error, <<P as Partition>::Page as Page>::Error>; #[cfg(not(nightly))] type Output<P, Row: SerdeData, E> = std::pin::Pin<Box<dyn Stream<Item = Result<Row, Error<P, E>>>>>; #[cfg(nightly)] type Output<P: Partition, Row: SerdeData, E> = impl Stream<Item = Result<Row, Error<P, E>>>; FnMutNamed! { pub type Closure<P, Row, E> = |self|partition=> P| -> Output<P, Row, E> where P: Partition, Row: SerdeData, E: 'static { #[allow(clippy::let_and_return)] let ret = async move { Ok(stream::iter( partition .pages() .await .map_err(JsonError::Partition)? .into_iter(), ) .flat_map(|page| { async move { let mut buf = Vec::with_capacity(10 * 1024 * 1024); let reader = Page::reader(page); pin_mut!(reader); let buf = PassError::new( reader.read_to_end(&mut buf).await.map(|_| Cursor::new(buf)), ); Ok(stream::iter( serde_json::Deserializer::from_reader(buf).into_iter().map( |x: Result<SerdeDeserialize<Row>, InternalJsonError>| Ok(x?.0), ), )) } .map(ResultExpandIter::new) .flatten_stream() }) .map(|row: Result<Result<Row, InternalJsonError>, Error<P, E>>| Ok(row??))) } .map(ResultExpandIter::new) .flatten_stream() .map(|row: Result<Result<Row, Error<P, E>>, Error<P, E>>| Ok(row??)); #[cfg(not(nightly))] let ret = ret.boxed_local(); ret } } impl<F, Row> Source for Json<F, Row> where F: File, Row: SerdeData, { type Item = Row; #[allow(clippy::type_complexity)] type Error = JsonError< F::Error, <F::Partition as Partition>::Error, <<F::Partition as Partition>::Page as Page>::Error, >; type ParStream = DistParStream<Self::DistStream>; #[cfg(not(nightly))] #[allow(clippy::type_complexity)] type DistStream = amadeus_core::par_stream::FlatMap< amadeus_core::into_par_stream::IterDistStream<std::vec::IntoIter<F::Partition>>, Closure<F::Partition, Row, F::Error>, >; #[cfg(nightly)] type DistStream = impl DistributedStream<Item = Result<Self::Item, Self::Error>>; fn par_stream(self) -> Self::ParStream { DistParStream::new(self.dist_stream()) } #[allow(clippy::let_and_return)] fn dist_stream(self) -> Self::DistStream { self.partitions.into_dist_stream().flat_map(Closure::new()) } } mod jsonerror { use serde::{Deserializer, Serializer}; pub(crate) fn serialize<T, S>(_t: &T, _serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { unimplemented!() } pub(crate) fn deserialize<'de, T, D>(_deserializer: D) -> Result<T, D::Error> where D: Deserializer<'de>, { unimplemented!() } } #[derive(Serialize, Deserialize, Debug)] pub enum JsonError<A, B, C> { File(A), Partition(B), Page(C), Json(#[serde(with = "jsonerror")] InternalJsonError), } impl<A, B, C> Clone for JsonError<A, B, C> where A: Clone, B: Clone, C: Clone, { fn clone(&self) -> Self { match self { Self::File(err) => Self::File(err.clone()), Self::Partition(err) => Self::Partition(err.clone()), Self::Page(err) => Self::Page(err.clone()), Self::Json(err) => Self::Json(serde::de::Error::custom(err)), } } } impl<A, B, C> PartialEq for JsonError<A, B, C> where A: PartialEq, B: PartialEq, C: PartialEq, { fn eq(&self, other: &Self) -> bool { match (self, other) { (Self::File(a), Self::File(b)) => a.eq(b), (Self::Partition(a), Self::Partition(b)) => a.eq(b), (Self::Page(a), Self::Page(b)) => a.eq(b), (Self::Json(a), Self::Json(b)) => a.to_string() == b.to_string(), _ => false, } } } impl<A, B, C> error::Error for JsonError<A, B, C> where A: error::Error, B: error::Error, C: error::Error, { } impl<A, B, C> Display for JsonError<A, B, C> where A: Display, B: Display, C: Display, { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { Self::File(err) => Display::fmt(err, f), Self::Partition(err) => Display::fmt(err, f), Self::Page(err) => Display::fmt(err, f), Self::Json(err) => Display::fmt(err, f), } } } impl<A, B, C> From<InternalJsonError> for JsonError<A, B, C> { fn from(err: InternalJsonError) -> Self { Self::Json(err) } } struct PassError<R>(Result<R, Option<io::Error>>); impl<R> PassError<R> { fn new(r: Result<R, io::Error>) -> Self { Self(r.map_err(Some)) } } impl<R> io::Read for PassError<R> where R: io::Read, { fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { match &mut self.0 { Ok(r) => r.read(buf), Err(r) => Err(r.take().unwrap()), } } }