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"sha256-gzTw/v1vj4dOVbpBSJX4J0DwUR6LIyXo7/SuuTJp1kM=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "04c1b180862888302ddfb2e3ad9eaa63afc60cf8", + "type": "github" + }, + "original": { + "owner": "numtide", + "repo": "flake-utils", + "type": "github" + } + }, + "naersk": { + "inputs": { + "nixpkgs": "nixpkgs" + }, + "locked": { + "lastModified": 1653413650, + "narHash": "sha256-wojDHjb+eU80MPH+3HQaK0liUy8EgR95rvmCl24i58Y=", + "owner": "nix-community", + "repo": "naersk", + "rev": "69daaceebe12c070cd5ae69ba38f277bbf033695", + "type": "github" + }, + "original": { + "owner": "nix-community", + "repo": "naersk", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1653738054, + "narHash": "sha256-IaR8iLN4Ms3f5EjU1CJkXSc49ZzyS5qv03DtVAti6/s=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "17b62c338f2a0862a58bb6951556beecd98ccda9", + "type": "github" + }, + "original": { + "id": "nixpkgs", + "type": "indirect" + } + }, + "nixpkgs_2": { + "locked": { + "lastModified": 1653738054, + "narHash": "sha256-IaR8iLN4Ms3f5EjU1CJkXSc49ZzyS5qv03DtVAti6/s=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "17b62c338f2a0862a58bb6951556beecd98ccda9", + "type": "github" + }, + "original": { + "id": "nixpkgs", + "type": "indirect" + } + }, + "root": { + "inputs": { + "flake-utils": "flake-utils", + "naersk": "naersk", + "nixpkgs": "nixpkgs_2" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..5a357fe --- /dev/null +++ b/flake.nix @@ -0,0 +1,33 @@ +{ + inputs = { + flake-utils.url = "github:numtide/flake-utils"; + naersk.url = "github:nix-community/naersk"; + }; + + outputs = { self, nixpkgs, flake-utils, naersk }: + flake-utils.lib.eachDefaultSystem ( + system: let + pkgs = nixpkgs.legacyPackages."${system}"; + naersk-lib = naersk.lib."${system}"; + in + rec { + # `nix build` + packages."hermit" = naersk-lib.buildPackage { + pname = "hermit"; + root = ./.; + }; + defaultPackage = packages."hermit"; + + # `nix run` + apps."hermit"= flake-utils.lib.mkApp { + drv = packages."hermit"; + }; + defaultApp = apps."hermit"; + + # `nix develop` + devShell = pkgs.mkShell { + nativeBuildInputs = with pkgs; [ rustc cargo openssl pkgconfig ]; + }; + } + ); +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a839885 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,565 @@ +use futures::prelude::*; + +#[tokio::main] +async fn main() { + todo!() +} + +mod task { + + //! Async tasks, communicating with each other across threads through generic + //! streams and sinks. + + use std::pin::Pin; + use std::sync::Arc; + use futures::prelude::*; + use crate::{flow::Flow, Activity, ctrl::Message, rule::Rule}; + + /// Perform a [`Task`]. + pub fn run (task: impl Task) { + tokio::spawn(task.run()); + } + + /// A computation running indefinitely on a separate thread. + pub trait Task { + + /// The future representing this computation. + type Future: Future + Send + 'static; + + /// Execute the task. + fn run (self) -> Self::Future; + + } + + /// API request event processing. + pub struct Api { + /// Input stream of API request events from the frontend endpoints. + pub fe_rx: F, + /// Input stream of API request events from the ActivityPub + /// endpoints. + pub ap_rx: A, + /// Output stream to the [`Ctrl`] task. + pub ctrl_tx: C, + /// Output stream to the [Activity processor pipeline][Process]. + pub pipe_tx: P, + } + + /// Processes CLI commands and sends them to either the [`Auto`] task (which + /// takes care of scheduling automated maintenance tasks) or the [`Ctrl`] task, + /// which propagates control messages through the system, like live config + /// updates or shutdown messages for example. + pub struct Ipc { + /// Output stream to the [`Auto`] task. + pub auto_tx: A, + /// Output stream to the [`Ctrl`] task. + pub ctrl_tx: C, + } + + /// Delivers control messages to other running tasks. + pub struct Ctrl { + /// Message stream from the [`Api`] task. + pub api_rx: A, + /// Message stream from the [`Ipc`] task. + pub ipc_rx: I, + /// Fan-out to all running tasks that are subscribed to [control messages][Ctrl]. + pub tx: S, + } + + /// Performs automated maintenance tasks. + pub struct Auto { + /// Receiver for manual job triggers received from the [`Ipc`] task. + pub ipc_rx: E, + /// Receiver for [control messages][Ctrl]. + pub ctrl_rx: C, + } + + pub struct Process { + pub data_rx: D, + pub ctrl_rx: C, + pub fe_tx: F, + } + + impl Task for Process + where + D: Stream> + Unpin + Send + 'static, + C: Stream + Unpin + Send + 'static, + Arc: Sink + Send + Sync + 'static, + F: Send + Sync + 'static, + { + type Future = Pin + Send + 'static>>; + + fn run (self) -> Self::Future { + + let Self { mut data_rx, mut ctrl_rx, fe_tx } = self; + + Box::pin(async move { + + let mut config = crate::conf::Config::new("localhost"); + let ctx = crate::Context {}; + let sink = Arc::new(fe_tx); + + loop { + tokio::select! { + // Await control commands from `Ctrl`. + Some (message) = ctrl_rx.next() => match message { + // Live config reloading. + Message::Reconfigure (c) => c(&mut config), + // Graceful termination command from `Ctrl`. + Message::Terminate => break, + }, + // Listen for incoming activities. + Some (data) = data_rx.next() => { + + // Dereferencing and other unfucking. + let d = ctx.dereferencer(); + let data = match data.apply(|j| d.dereference(j)).await { + Ok (data) => data, + _ => continue, + }; + + // Run both incoming and outgoing activities through the filtering system. + let action = |act| config.rules.iter().try_fold(act, |a, r| r.apply(a)); + let data = match data.map(action).to_option() { + // Activity survived the filtering process, bind it to `data`. + Some (data) => data, + // Activity got filtered out, move on. + None => continue, + }; + + // Perform each activity in the context of the instance. + let c = ctx.clone(); + let copy = data.clone(); + let data = match data.apply(|a| a.perform(c)).await { + // Everything went ok, we can continue, bind `copy` to `data`. + Ok (_) => copy, + // Something went wrong while performing the activity, + // report error and move on. + _ => continue, + }; + + // If incoming: push a notification to the frontend. + let incoming = { + let s = sink.clone(); + let c = config.notify.clone(); + move |a: Activity| a.notify(c, s) + }; + // If outgoing: deliver the activity to its targets. + let outgoing = { + let s = ctx.signer(); + move |a: Activity| a.deliver(s) + }; + + match data.pick(incoming, outgoing).await { + Ok (_) => println!("Yay"), + _ => println!("Boo"), + }; + + }, + } + } + }) + } + + } + +} + +pub mod flow { + + //! Functional control flow based on the source and destination + //! of a message flowing through the system. + + use std::future::Future; + + /// A wrapper type that annotates a message with the flow it is + /// supposed to take, without allowing that flow to be inspected + /// or modified. + #[derive(Clone)] + pub struct Flow { + flow: Direction, + data: T, + } + + #[derive(Clone, Copy)] + enum Direction { + Incoming, + Outgoing, + } + + impl Flow { + + #[allow(non_snake_case)] + /// Make the data take the "incoming" flow. + pub fn Incoming (data: T) -> Flow { + Flow { data, flow: Direction::Incoming } + } + + #[allow(non_snake_case)] + /// Make the data take the "outbound" flow. + pub fn Outgoing (data: T) -> Flow { + Flow { data, flow: Direction::Outgoing } + } + + /// Apply a function `f` to the value inside, without disturbing + /// the flow direction. + pub async fn apply (self, f: F) -> Result, E> + where + A: Future>, + F: FnOnce (T) -> A, + { + let Flow { data, flow } = self; + Ok (Flow { + data: f(data).await?, + flow, + }) + } + + /// If the message is taking the incoming flow, apply `f`, if it is taking the + /// outgoing flow, apply `g`. + pub async fn pick (self, f: F, g: G) -> Result, E> + where + A: Future>, + B: Future>, + F: FnOnce (T) -> A, + G: FnOnce (T) -> B, + { + match self.flow { + Direction::Incoming => self.apply(f).await, + Direction::Outgoing => self.apply(g).await, + } + } + + /// Map over the contained value. + pub fn map (self, f: F) -> Flow + where + F: FnOnce (T) -> U, + { + Flow { + data: f(self.data), + flow: self.flow, + } + } + + } + + impl Flow> { + /// Swap the containers. + pub fn to_option (self) -> Option> { + let Flow { flow, data } = self; + data.map(|data| Flow { + flow, + data, + }) + } + } + + impl Flow> { + /// Swap the containers. + pub fn to_result (self) -> Result, E> { + let Flow { flow, data } = self; + data.map(|data| Flow { + flow, + data, + }) + } + } + +} + +/// Control messages. +pub mod ctrl { + + use std::sync::Arc; + + use crate::conf::Config; + + #[derive(Clone)] + pub enum Message { + /// Modify the existing configuration of each task. + Reconfigure (Arc>), + Terminate, + } + +} + +/// Configuration. +pub mod conf { + + use crate::rule::Rule; + + pub struct Config { + /// The domain of the instance. + pub host: String, + /// The port to host the instance on. Defaults to `6969`. + pub port: u16, + /// Filtering rules applied to each activity. + pub rules: Vec>, + /// Notification predicate. + pub notify: Notify, + } + + impl Config { + /// Create a new default config. + pub fn new (hostname: impl ToString) -> Config { + let (notify, rules) = def(); + Config { + host: hostname.to_string(), + port: 6969, + notify, + rules, + } + } + } + + #[derive(Clone, Copy)] + pub struct Notify { + pub post_liked: bool, + pub post_shared: bool, + pub follow_requested: bool, + pub new_follower: bool, + } + + impl Default for Notify { + fn default () -> Self { + Notify { + post_liked: true, + post_shared: true, + follow_requested: true, + new_follower: true, + } + } + } + + /// Shortcut for creating a default instance + fn def () -> T where T: Default { T::default() } + +} + +#[derive(Clone)] +pub struct Context {} + +impl Context { + pub fn dereferencer (&self) -> Dereferencer { + Dereferencer { web: reqwest::Client::new() } + } + + pub fn signer (&self) -> &(dyn sign::Sign + Send + Sync) { + todo!() + } +} + +pub struct Dereferencer { + web: reqwest::Client +} + +impl Dereferencer { + pub async fn dereference (&self, a: serde_json::Value) -> Result { + todo!() + } +} + +#[derive(Debug)] +pub enum Error {} + +pub type Result = std::result::Result; + +#[derive(Clone)] +pub enum Activity { + Create (act::Create), + Follow (act::Follow), +} + +impl Activity { + pub async fn perform (self, ctx: Context) -> Result<()> { + todo!() + } + + pub async fn notify (self, cfg: conf::Notify, sink: S) -> Result<()> + where + S: Sink, + { + todo!() + } + + pub async fn deliver (self, signer: &S) -> Result<()> + where + S: sign::Sign + ?Sized, + { + todo!() + } +} + +pub mod act { + + #[derive(Clone)] + pub enum Create { + Note {}, + } + + #[derive(Clone)] + pub enum Follow { + Actor {}, + } +} + +pub mod sign { + + //! Request signing. + + use reqwest::Request; + use crate::Result; + + pub trait Sign { + fn sign (&self, req: &mut Request) -> Result<()>; + } +} + +pub mod rule { + + //! User-defined activity transformation rules. + //! + //! Every [`Rule`] is a function `fn (Activity) -> Option`. + + use super::Activity; + + /// Transforms an [`Activity`]. + /// + /// ``` + /// use hermit::{ Activity, rule::{ Filter, Rule, keep } }; + /// + /// // Fails to compile if the given parameter is not a `Rule` + /// fn is_rule (x: R) -> R { x } + /// + /// // Closures of `Activity -> Activity` or + /// // `Activity -> Option` can be used. + /// let closure = is_rule(|a: Activity| Some(a)); + /// + /// // `hermit::rule::Filter` implements `Rule`. This one will + /// // filter every activity. + /// let filter = is_rule(Filter (|_| true)) + /// + /// // `hermit::rule::keep` is a function pointer, and they + /// // always implement the `Fn*` traits. + /// let function = is_rule(keep); + /// + /// // Rules can be combined using the `then` operator, in which + /// // case they will be applied in sequence. + /// let combined = is_rule(closure.then(filter).then(keep)); + /// + /// // Check if it works! Due to `filter`, any input this combined + /// // rule is applied to will be dropped. + /// let result = combined.apply(todo!()); + /// assert!(result.is_none()) + /// ``` + pub trait Rule { + + /// Apply the rule to the [`Activity`]. + /// + /// If this function returns `None`, the activity is dropped and will + /// not be processed further. This allows rules to function both as + /// transformations and as filters. + fn apply (&self, act: Activity) -> Option; + + /// Sequence `next` after `self` in a lazy way. + fn then (self, next: R) -> Then + where + Self: Sized, + R: Rule, + { + Then (self, next) + } + + /// Apply `self` only if `pred` holds. + fn only_if

(self, pred: P) -> Cond + where + Self: Sized, + P: Fn (&Activity) -> bool, + { + Cond { rule: self, pred } + } + + } + + impl Rule for F + where + O: Into>, + F: Fn (Activity) -> O, + { + fn apply (&self, act: Activity) -> Option { + self(act).into() + } + } + + // Primitives + + /// Always keep passed activities. + pub fn keep (a: Activity) -> Option { Some (a) } + + /// Always drop passed activities. + pub fn drop (_: Activity) -> Option { None } + + /// A simple filtering rule that drops the activity if it matches the predicate `P`. + pub struct Filter

(pub P) + where + P: Fn (&Activity) -> bool; + + impl

Rule for Filter

+ where + P: Fn (&Activity) -> bool + { + fn apply (&self, act: Activity) -> Option { + let Self (f) = self; + if f(&act) { + None + } else { + Some (act) + } + } + } + + // Combinators + + /// Sequence two rules. + /// + /// `B` will only be applied if `A` returns [`Some`], otherwise it + /// short-circuits. + pub struct Then (A, B); + + impl Rule for Then + where + A: Rule, + B: Rule, + { + fn apply (&self, act: Activity) -> Option { + let Self (a, b) = self; + a.apply(act).and_then(|act| { + b.apply(act) + }) + } + } + + /// Apply a rule conditionally. + /// + /// If the predicate `P` returns `true`, apply `R`. Otherwise, return the + /// activity unmodified. + pub struct Cond { + pred: P, + rule: R, + } + + impl Rule for Cond + where + P: Fn (&Activity) -> bool, + R: Rule, + { + fn apply (&self, act: Activity) -> Option { + let Self { pred, rule } = self; + if pred(&act) { + rule.apply(act) + } else { + Some (act) + } + } + } + +}