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serde::Deserialize)] +pub struct Tag { + pub name: String, +} + +#[derive(Debug, serde::Deserialize)] +pub struct Application { + pub name: String, + pub website: String, +} + +#[derive(Debug, serde::Deserialize)] +pub struct Post { + pub created_at: String, + pub url: String, + pub content: String, + pub account: Account, + pub tags: Vec, + pub application: Option, + pub sensitive: Option, +} + +impl Post { + // fn time + // fn text_content +} + +#[derive(Debug)] +pub struct Feed { + pub posts: Vec, +} + +impl Feed { + pub async fn fetch(client: &reqwest::Client, url: &str) -> Result { + println!("GET {}", url); + let posts: Vec = client.get(url) + .send() + .await? + .json() + .await?; + println!("{}: {} posts", url, posts.len()); + Ok(Feed { posts }) + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..0681846 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,57 @@ +use std::time::Duration; +use tokio::time::{Instant, timeout}; + +mod world; +mod feed; +mod worker; + +use worker::Message; + +#[tokio::main] +async fn main() { + let mut world = world::World::new(); + world.introduce("chaos.social".to_owned()); + + + let client = reqwest::Client::builder() + .user_agent(concat!( + env!("CARGO_PKG_NAME"), + "/", + env!("CARGO_PKG_VERSION"), + )) + .deflate(true) + .gzip(true) + .build() + .expect("reqwest::Client"); + + let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel(); + loop { + match world.dequeue() { + Err(time) => { + let duration = time - Instant::now(); + timeout(duration, async { + if let message = rx.recv().await.unwrap() { + match message { + Message::Fetched { host } => + world.set_fetched(host, Duration::from_secs(60)), + Message::Error { host } => + world.set_error(host), + Message::IntroduceHosts { hosts } => { + for host in hosts.into_iter() { + world.introduce(host); + } + } + Message::Posts { posts } => {} + } + } else { + println!("no rx?"); + } + }).await; + } + Ok(host) => { + println!("Fetch {}", host); + worker::fetch_and_process(tx.clone(), client.clone(), host); + } + } + } +} diff --git a/src/worker.rs b/src/worker.rs new file mode 100644 index 0000000..8cef8a5 --- /dev/null +++ b/src/worker.rs @@ -0,0 +1,44 @@ +use std::collections::HashSet; +use crate::feed; + +#[derive(Debug)] +pub enum Message { + Fetched { host: String }, + Error { host: String }, + IntroduceHosts { hosts: Vec }, + Posts { posts: Vec }, +} + +pub fn fetch_and_process( + tx: tokio::sync::mpsc::UnboundedSender, + client: reqwest::Client, + host: String, +) { + let url = format!("https://{}/api/v1/timelines/public", host); + tokio::spawn(async move { + match feed::Feed::fetch(&client, &url).await { + Ok(feed) => { + tx.send(Message::Fetched { host: host.clone() }).unwrap(); + + // Analyze + let mut posts = Vec::with_capacity(feed.posts.len()); + let mut hosts = HashSet::new(); + for post in feed.posts.into_iter() { + if let Some(author_host) = post.account.host() { + if author_host == host { + posts.push(post); + } + hosts.insert(author_host); + } + } + let hosts = hosts.into_iter().collect(); + tx.send(Message::IntroduceHosts { hosts }).unwrap(); + tx.send(Message::Posts { posts }).unwrap(); + } + Err(e) => { + println!("Failed fetching {}: {}", host, e); + tx.send(Message::Error { host }).unwrap(); + } + } + }); +} diff --git a/src/world.rs b/src/world.rs new file mode 100644 index 0000000..7cd43bb --- /dev/null +++ b/src/world.rs @@ -0,0 +1,74 @@ +use std::collections::{HashMap, BTreeMap}; +use std::time::Duration; +use tokio::time::Instant; + +const ERROR_INTERVAL: Duration = Duration::from_secs(86400u64); + +pub struct Instance { + last_fetch: Option, + error: bool, +} + +pub struct World { + instances: HashMap, + queue: BTreeMap, +} + +// TODO: self.queue.insert() with key collision avoidance +impl World { + pub fn new() -> Self { + World { + instances: HashMap::new(), + queue: BTreeMap::new(), + } + } + + pub fn introduce(&mut self, host: String) { + let now = Instant::now(); + + if self.instances.get(&host).is_none() { + self.instances.insert(host.clone(), Instance { + last_fetch: None, + error: false, + }); + self.queue.insert(now, host); + } + } + + pub fn set_fetched(&mut self, host: String, next_interval: Duration) { + let now = Instant::now(); + + let instance = self.instances.get_mut(&host).unwrap(); + instance.last_fetch = Some(now); + instance.error = false; + println!("enqueue at {:?}", now + next_interval); + self.queue.insert(now + next_interval, host); + } + + pub fn set_error(&mut self, host: String) { + let now = Instant::now(); + + let instance = self.instances.get_mut(&host).unwrap(); + instance.last_fetch = Some(now); + instance.error = true; + println!("enqueue at {:?}", now + ERROR_INTERVAL); + self.queue.insert(now + ERROR_INTERVAL, host); + } + + pub fn dequeue(&mut self) -> Result { + let now = Instant::now(); + + if let Some(time) = self.queue.keys().next().cloned() { + if time <= now { + self.queue.remove(&time) + .map(|host| Ok(host)) + .unwrap_or(Err(now + Duration::from_secs(1))) + } else { + Err(time) + } + } else { + println!("empty queue"); + Err(now + Duration::from_secs(60)) + } + } +}