commit ef186dd241a6224aef9fbfbdd1fd83b804b309d3 · hauleth.dev/ptsd

+102 -18
src/filters.rs
···

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       use async_trait::async_trait;

     

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       use serde::Deserialize;

     

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       use tokio::io::{self, AsyncReadExt};

     

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       use tokio::fs;

     

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       use futures::prelude::*;

     

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       use crate::pattern::Pattern;

     

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       #[typetag::deserialize(tag = "type")]

     

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       #[async_trait]

     

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       pub trait Filter: std::fmt::Debug {

     

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       pub trait Filter: std::fmt::Debug + Sync {

     

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           async fn matches(&self, path: &Path) -> bool;

     

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       }

     

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       #[derive(Debug, Deserialize)]

     

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       pub struct Name(Pattern);

     

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       macro_rules! filter {

     

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           {

     

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               $name:literal;

     

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               $(#[$sattr:meta])*

     

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               struct $sname:ident {$($(#[$attr:meta])* $fname:ident : $ftype:ty,)*};

     

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               ($self_:ident, $path:ident) -> $body:block

     

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           } => {

     

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               #[derive(Debug, serde::Deserialize)]

     

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               $(#[$sattr])*

     

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               pub struct $sname { $($(#[$attr])* $fname: $ftype),* }

     

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       #[typetag::deserialize(name = "name")]

     

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       #[async_trait]

     

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       impl Filter for Name {

     

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           async fn matches(&self, path: &Path) -> bool {

     

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               self.0.matches(path)

     

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               #[typetag::deserialize(name = $name)]

     

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               #[async_trait]

     

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               impl Filter for $sname {

     

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                   async fn matches(&$self_, $path: &Path) -> bool {

     

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                       $body

     

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                   }

     

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               }

     

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           };

     

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           {

     

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               $name:literal;

     

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               $(#[$sattr:meta])*

     

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               struct $sname:ident ($($field:ty),*);

     

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               ($self_:ident, $path:ident) -> $body:block

     

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           } => {

     

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               #[derive(Debug, serde::Deserialize)]

     

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               $(#[$sattr])*

     

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               pub struct $sname ($($field),*);

     

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               #[typetag::deserialize(name = $name)]

     

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               #[async_trait]

     

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               impl Filter for $sname {

     

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                   async fn matches(&$self_, $path: &Path) -> bool {

     

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                       $body

     

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                   }

     

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               }

     

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           }

     

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       }

     

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       #[derive(Debug, Deserialize)]

     

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       pub struct Size {

     

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           size: u64,

     

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           #[serde(with = "Ordering")]

     

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           ordering: std::cmp::Ordering,

     

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       filter! {

     

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           "name";

     

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           struct Name(Pattern);

     

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           (self, path) -> {

     

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               self.0.matches(path)

     

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           }

     

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       }

     

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       #[derive(Deserialize)]

     

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       #[serde(remote = "std::cmp::Ordering")]

     

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       #[serde(rename_all = "snake_case")]

     

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       enum Ordering {

     

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           Less,

     

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           Equal,

     

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           Greater,

     

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       }

     

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       #[typetag::deserialize(name = "size")]

     

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       #[async_trait]

     

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       impl Filter for Size {

     

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           async fn matches(&self, path: &Path) -> bool {

     

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       filter! {

     

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           "size";

     

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           struct Size {

     

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               size: u64,

     

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               #[serde(with = "Ordering")]

     

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               ordering: std::cmp::Ordering,

     

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           };

     

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           (self, path) -> {

     

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               with_metadata(path, |metadata| {

     

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                   let len = metadata.len();

     

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                   self.size.cmp(&len) == self.ordering

     

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                   len.cmp(&self.size) == self.ordering

     

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               })

     

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               .await

     

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           }

     

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       }

     

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       #[derive(Debug, Deserialize)]

     

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       #[serde(tag = "is", rename_all = "snake_case")]

     

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       pub enum FileType {

     

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           Dir,

     

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           File,

     
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           fs::metadata(path).await.map(fun).unwrap_or(false)

     

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       }

     

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       filter! {

     

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           "any";

     

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           struct Any { filters: Box<[Box<dyn Filter>]>, };

     

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           (self, path) -> {

     

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               stream::iter(&*self.filters)

     

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                   .any(|f| f.matches(path))

     

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               .await

     

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           }

     

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       }

     

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       filter! {

     

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           "all";

     

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           struct All { filters: Box<[Box<dyn Filter>]>, };

     

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           (self, path) -> {

     

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               stream::iter(&*self.filters)

     

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                   .all(|f| f.matches(path))

     

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               .await

     

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           }

     

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       }

     

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       #[derive(Debug, Deserialize)]

     

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       #[serde(rename_all = "snake_case")]

     

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       pub enum Magic {

     

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           Mime(String),

     

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           Bytes(Box<[u8]>),

     

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       }

     

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       async fn read_first_bytes(n: usize, path: &Path) -> io::Result<Box<[u8]>> {

     

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           let mut file = fs::File::open(path).await?;

     

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           let mut buf = vec![0; n];

     

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           file.read_exact(&mut buf).await?;

     

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           Ok(buf.into())

     

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       }

     

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       #[typetag::deserialize(name = "content_type")]

     

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       #[async_trait]

     

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       impl Filter for Magic {

     

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           async fn matches(&self, file: &Path) -> bool {

     

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               match *self {

     

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                   Magic::Bytes(ref bytes) => {

     

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                       read_first_bytes(bytes.len(), file).await.map(|read| read == *bytes).unwrap_or(false)

     

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                   },

     

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                   Magic::Mime(_) => unimplemented!()

     

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               }

     

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           }

     

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       }