parent
6453392758
commit
5dc10547d5
GPG Key ID:
284488987C31F630
@ -1,34 +1,46 @@
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//! Generating the strings
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use super::*;
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use tokio::sync::mpsc::error::SendError;
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use futures::StreamExt;
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#[derive(Debug)]
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pub struct GenBodyError(pub String);
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#[derive(Debug, Default)]
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pub struct GenBodyError(Option<String>);
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impl error::Error for GenBodyError{}
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impl fmt::Display for GenBodyError
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "failed to write {:?} to body", self.0)
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if let Some(z) = &self.0 {
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write!(f, "failed to write read string {:?} to body", z)
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} else {
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write!(f, "failed to read string from chain. it might be empty.")
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}
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}
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}
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pub async fn body(state: State, num: Option<usize>, mut output: mpsc::Sender<String>) -> Result<(), GenBodyError>
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{
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let chain = state.chain().read().await;
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if !chain.is_empty() {
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let mut chain = state.chain_read();
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let filter = state.outbound_filter();
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match num {
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Some(num) if num < state.config().max_gen_size => {
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//This could DoS `full_body` and writes, potentially.
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for string in chain.str_iter_for(num) {
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output.send(filter.filter_owned(string)).await.map_err(|e| GenBodyError(e.0))?;
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let mut chain = chain.take(num);
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while let Some(string) = chain.next().await {
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output.send(filter.filter_owned(string)).await?;
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}
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},
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_ => output.send(filter.filter_owned(chain.generate_str())).await.map_err(|e| GenBodyError(e.0))?,
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}
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_ => output.send(filter.filter_owned(chain.next().await.ok_or_else(GenBodyError::default)?)).await?,
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}
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Ok(())
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}
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impl From<SendError<String>> for GenBodyError
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{
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#[inline] fn from(from: SendError<String>) -> Self
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{
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Self(Some(from.0))
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}
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}
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@ -0,0 +1,285 @@
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//! Chain handler.
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use super::*;
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use std::{
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marker::Send,
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sync::Weak,
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num::NonZeroUsize,
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task::{Poll, Context,},
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pin::Pin,
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};
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use tokio::{
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sync::{
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RwLock,
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RwLockReadGuard,
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mpsc::{
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self,
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error::SendError,
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},
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},
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task::JoinHandle,
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time::{
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self,
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Duration,
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},
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};
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use futures::StreamExt;
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/// Settings for chain handler
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#[derive(Debug, Clone, PartialEq)]
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pub struct Settings
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{
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pub backlog: usize,
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pub capacity: usize,
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pub timeout: Duration,
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pub throttle: Option<Duration>,
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pub bounds: range::DynRange<usize>,
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}
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impl Settings
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{
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/// Should we keep this string.
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#[inline] fn matches(&self, s: &str) -> bool
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{
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true
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}
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}
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impl Default for Settings
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{
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#[inline]
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fn default() -> Self
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{
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Self {
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backlog: 32,
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capacity: 4,
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timeout: Duration::from_secs(5),
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throttle: Some(Duration::from_millis(200)),
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bounds: feed::DEFAULT_FEED_BOUNDS.into(),
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}
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}
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}
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#[derive(Debug)]
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struct HostInner<T>
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{
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input: mpsc::Receiver<Vec<T>>,
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}
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#[derive(Debug)]
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struct Handle<T: Send+ chain::Chainable>
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{
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chain: RwLock<chain::Chain<T>>,
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input: mpsc::Sender<Vec<T>>,
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opt: Settings,
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/// Data used only for the worker task.
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host: msg::Once<HostInner<T>>,
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}
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#[derive(Clone, Debug)]
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pub struct ChainHandle<T: Send + chain::Chainable>(Arc<Box<Handle<T>>>);
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impl<T: Send+ chain::Chainable> ChainHandle<T>
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{
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#[inline] pub fn new(chain: chain::Chain<T>) -> Self
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{
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Self::with_settings(chain, Default::default())
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}
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pub fn with_settings(chain: chain::Chain<T>, opt: Settings) -> Self
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{
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let (itx, irx) = mpsc::channel(opt.backlog);
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Self(Arc::new(Box::new(Handle{
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chain: RwLock::new(chain),
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input: itx,
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opt,
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host: msg::Once::new(HostInner{
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input: irx,
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})
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})))
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}
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/// Acquire the chain read lock
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async fn chain(&self) -> RwLockReadGuard<'_, chain::Chain<T>>
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{
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self.0.chain.read().await
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}
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/// A reference to the chain
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pub fn chain_ref(&self) -> &RwLock<chain::Chain<T>>
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{
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&self.0.chain
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}
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/// Create a stream that reads generated values forever.
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pub fn read(&self) -> ChainStream<T>
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{
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ChainStream{
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chain: Arc::downgrade(&self.0),
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buffer: Vec::with_capacity(self.0.opt.backlog),
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}
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}
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/// Send this buffer to the chain
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pub async fn write(&self, buf: Vec<T>) -> Result<(), SendError<Vec<T>>>
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{
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self.0.input.clone().send(buf).await
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}
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}
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impl ChainHandle<String>
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{
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#[deprecated = "use read() pls"]
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pub async fn generate_body(&self, state: &state::State, num: Option<usize>, mut output: mpsc::Sender<String>) -> Result<(), SendError<String>>
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{
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let chain = self.chain().await;
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if !chain.is_empty() {
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let filter = state.outbound_filter();
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match num {
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Some(num) if num < state.config().max_gen_size => {
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//This could DoS writes, potentially.
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for string in chain.str_iter_for(num) {
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output.send(filter.filter_owned(string)).await?;
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}
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},
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_ => output.send(filter.filter_owned(chain.generate_str())).await?,
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}
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}
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Ok(())
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}
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}
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/// Host this handle on the current task.
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///
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/// # Panics
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/// If `from` has already been hosted.
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pub async fn host(from: ChainHandle<String>)
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{
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let opt = from.0.opt.clone();
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let data = from.0.host.unwrap().await;
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let (mut tx, child) = {
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// The `real` input channel.
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let from = from.clone();
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let opt = opt.clone();
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let (tx, rx) = mpsc::channel::<Vec<Vec<_>>>(opt.backlog);
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(tx, tokio::spawn(async move {
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let mut rx = if let Some(thr) = opt.throttle {
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time::throttle(thr, rx).boxed()
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} else {
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rx.boxed()
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};
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trace!("child: Begin waiting on parent");
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while let Some(item) = rx.next().await {
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let mut lock = from.0.chain.write().await;
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for item in item.into_iter()
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{
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use std::ops::DerefMut;
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for item in item.into_iter() {
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feed::feed(lock.deref_mut(), item, &from.0.opt.bounds);
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}
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}
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}
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trace!("child: exiting");
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}))
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};
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trace!("Begin polling on child");
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tokio::select!{
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v = child => {
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match v {
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#[cold] Ok(_) => {warn!("Child exited before we have? This should probably never happen.")},//Should never happen.
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Err(e) => {error!("Child exited abnormally. Aborting: {}", e)}, //Child panic or cancel.
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}
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},
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_ = async move {
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let mut rx = data.input.chunk(opt.capacity); //we don't even need this tbh
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while Arc::strong_count(&from.0) > 2 {
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tokio::select!{
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_ = time::delay_for(opt.timeout) => {
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rx.push_now();
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}
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Some(buffer) = rx.next() => {
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if let Err(err) = tx.send(buffer).await {
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// Receive closed?
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//
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// This probably shouldn't happen, as we `select!` for it up there and child never calls `close()` on `rx`.
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// In any case, it means we should abort.
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error!("Failed to send buffer: {}", err);
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break;
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}
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}
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}
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}
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} => {
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// Normal exit
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trace!("Normal exit")
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},
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}
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// No more handles except child, no more possible inputs.
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trace!("Returning");
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}
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/// Spawn a new chain handler for this chain.
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pub fn spawn(from: chain::Chain<String>, opt: Settings) -> (JoinHandle<()>, ChainHandle<String>)
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{
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let handle = ChainHandle::with_settings(from, opt);
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(tokio::spawn(host(handle.clone())), handle)
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}
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#[derive(Debug)]
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pub struct ChainStream<T: Send + chain::Chainable>
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{
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chain: Weak<Box<Handle<T>>>,
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buffer: Vec<T>,
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}
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impl ChainStream<String>
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{
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async fn try_pull(&mut self, n: usize) -> Option<NonZeroUsize>
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{
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if n == 0 {
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return None;
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}
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if let Some(read) = self.chain.upgrade() {
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let chain = read.chain.read().await;
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if chain.is_empty() {
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return None;
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}
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let n = if n == 1 {
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self.buffer.push(chain.generate_str());
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1
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} else {
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self.buffer.extend(chain.str_iter_for(n));
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n //for now
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};
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Some(unsafe{NonZeroUsize::new_unchecked(n)})
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} else {
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None
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}
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}
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}
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impl Stream for ChainStream<String>
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{
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type Item = String;
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fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
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use futures::Future;
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let this = self.get_mut();
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if this.buffer.len() == 0 {
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let pull = this.try_pull(this.buffer.capacity());
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tokio::pin!(pull);
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match pull.poll(cx) {
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Poll::Ready(Some(_)) => {},
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Poll::Pending => return Poll::Pending,
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_ => return Poll::Ready(None),
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};
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}
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debug_assert!(this.buffer.len()>0);
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Poll::Ready(Some(this.buffer.remove(0)))
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}
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}
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