From a1c91f6d4e8d3cf3ad54f11b0da99c10f984b1d1 Mon Sep 17 00:00:00 2001 From: Sebastian Hugentobler Date: Thu, 23 Feb 2023 12:09:27 +0100 Subject: [PATCH] initial commit --- .gitignore | 4 + Cargo.lock | 1249 ++++++++++++++++++++++++++++++++++++++ Cargo.toml | 16 + Dockerfile | 25 + assets/index.html | 14 + assets/index.js | 66 ++ src/action.rs | 47 ++ src/actions/delete.rs | 22 + src/actions/insert.rs | 18 + src/actions/linebreak.rs | 12 + src/actions/mod.rs | 8 + src/actions/paste.rs | 18 + src/main.rs | 57 ++ src/ws.rs | 77 +++ 14 files changed, 1633 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 Dockerfile create mode 100644 assets/index.html create mode 100644 assets/index.js create mode 100644 src/action.rs create mode 100644 src/actions/delete.rs create mode 100644 src/actions/insert.rs create mode 100644 src/actions/linebreak.rs create mode 100644 src/actions/mod.rs create mode 100644 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"628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463" + +[[package]] +name = "windows_x86_64_msvc" +version = "0.42.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd" + +[[package]] +name = "woweb-poc" +version = "0.1.0" +dependencies = [ + "axum", + "axum-extra", + "futures", + "headers", + "serde", + "serde_json", + "tokio", + "tower-http", + "tracing", + "tracing-subscriber", +] diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..16e43a7 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,16 @@ +[package] +name = "woweb-poc" +version = "0.1.0" +edition = "2021" + +[dependencies] +axum = { version = "0.6.7", features = ["ws", "headers"] } +axum-extra = { version = "0.5.0", features = ["spa"] } +futures = "0.3.26" +headers = "0.3.8" +serde = { version = "1.0.152", features = ["derive"] } +serde_json = "1.0.93" +tokio = { version = "1.25.0", features = ["full"] } +tower-http = { version = "0.3.5", features = ["trace"] } +tracing = "0.1.37" +tracing-subscriber = { version = "0.3.16", features = ["env-filter"] } diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..4268639 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,25 @@ +FROM docker.io/rust:1.67-alpine3.17 AS builder + +RUN apk add --no-cache \ + musl-dev + +ADD . /src +WORKDIR /src + +RUN cargo build --release +RUN strip target/release/woweb-poc + +RUN adduser -D woweb + + +FROM scratch + +COPY --from=builder /etc/passwd /etc/passwd +COPY --from=builder /src/target/release/woweb-poc "/opt/woweb-poc" +COPY --from=builder /src/assets "/opt/assets" + +EXPOSE 3000 + +WORKDIR /opt +USER woweb +CMD ["/opt/woweb-poc", "0.0.0.0:3000"] diff --git a/assets/index.html b/assets/index.html new file mode 100644 index 0000000..90bc599 --- /dev/null +++ b/assets/index.html @@ -0,0 +1,14 @@ + + + + + CRDT Playground + + + + + + + diff --git a/assets/index.js b/assets/index.js new file mode 100644 index 0000000..acd4d01 --- /dev/null +++ b/assets/index.js @@ -0,0 +1,66 @@ +const areaId = "doctext"; +const validEvents = [ + "insertText", + "insertFromPaste", + "insertLineBreak", + "deleteContentBackward", + "deleteContentForward", +]; + +let selectionStart = 0; +let selectionEnd = 0; + +let area; +let ws; + +const uuid = self.crypto.randomUUID(); + +function setup() { + area = document.querySelector(`#${areaId}`); + ws = new WebSocket("ws://localhost:3000/ws"); + + setupUi(); + setupWs(); +} + +function setupUi() { + document.addEventListener("selectionchange", onSelectionChange, false); + area.addEventListener("input", onInput, false); +} + +function setupWs() { + ws.onmessage = function (e) { + let payload = JSON.parse(e.data); + if (payload.client !== uuid) { + area.value = payload.doc; + } + }; +} + +function onSelectionChange(event) { + const activeElement = document.activeElement; + + if (activeElement && activeElement.id === areaId) { + selectionStart = area.selectionStart; + selectionEnd = area.selectionEnd; + } +} + +function onInput(event) { + if (!validEvents.includes(event.inputType)) return; + const payload = { + client: uuid, + time: performance.now(), + action: event.inputType, + data: event.data, + start: selectionStart, + end: selectionEnd, + }; + + ws.send(JSON.stringify(payload)); + + console.log(event.inputType); + console.log(selectionStart); + console.log(selectionEnd); + console.log(event.data); +} diff --git a/src/action.rs b/src/action.rs new file mode 100644 index 0000000..59864e8 --- /dev/null +++ b/src/action.rs @@ -0,0 +1,47 @@ +use std::sync::Arc; + +use serde::{Deserialize, Serialize}; + +use crate::actions::delete::{DeleteContentBackward, DeleteContentForward}; +use crate::actions::insert::InsertText; +use crate::actions::linebreak::InsertLineBreak; +use crate::actions::paste::InsertFromPaste; +use crate::actions::ActionRunner; +use crate::AppState; + +#[derive(Serialize, Deserialize)] +#[serde(rename_all = "camelCase")] +enum ActionType { + InsertText, + InsertFromPaste, + InsertLineBreak, + DeleteContentBackward, + DeleteContentForward, +} + +#[derive(Serialize, Deserialize)] +pub(crate) struct Action { + pub(crate) client: String, + time: u64, + data: Option, + action: ActionType, + start: usize, + end: usize, +} + +impl Action { + pub(crate) async fn execute(&self, state: Arc) { + { + let mut doc = state.doc.write().await; + let action: Box = match self.action { + ActionType::InsertText => Box::new(InsertText), + ActionType::InsertFromPaste => Box::new(InsertFromPaste), + ActionType::InsertLineBreak => Box::new(InsertLineBreak), + ActionType::DeleteContentBackward => Box::new(DeleteContentBackward), + ActionType::DeleteContentForward => Box::new(DeleteContentForward), + }; + + *doc = action.run(self.start, self.end, self.data.clone(), doc.clone()); + } + } +} diff --git a/src/actions/delete.rs b/src/actions/delete.rs new file mode 100644 index 0000000..c701b08 --- /dev/null +++ b/src/actions/delete.rs @@ -0,0 +1,22 @@ +use super::ActionRunner; + +pub(crate) struct DeleteContentBackward; +pub(crate) struct DeleteContentForward; + +impl ActionRunner for DeleteContentBackward { + fn run(&self, start: usize, _end: usize, _data: Option, mut doc: String) -> String { + if start > 0 { + doc.remove(start - 1); + } + doc + } +} + +impl ActionRunner for DeleteContentForward { + fn run(&self, start: usize, _end: usize, _data: Option, mut doc: String) -> String { + if doc.len() > start { + doc.remove(start); + } + doc + } +} diff --git a/src/actions/insert.rs b/src/actions/insert.rs new file mode 100644 index 0000000..868edd6 --- /dev/null +++ b/src/actions/insert.rs @@ -0,0 +1,18 @@ +use super::ActionRunner; + +pub(crate) struct InsertText; + +impl ActionRunner for InsertText { + fn run(&self, start: usize, end: usize, data: Option, mut doc: String) -> String { + if doc.len() < start || data.is_none() { + return doc; + } + + if start < end { + doc.replace_range(start..end, ""); + } + + doc.insert_str(start, &data.unwrap()); + doc + } +} diff --git a/src/actions/linebreak.rs b/src/actions/linebreak.rs new file mode 100644 index 0000000..5f4ce8d --- /dev/null +++ b/src/actions/linebreak.rs @@ -0,0 +1,12 @@ +use super::ActionRunner; + +pub(crate) struct InsertLineBreak; + +impl ActionRunner for InsertLineBreak { + fn run(&self, start: usize, _end: usize, _data: Option, mut doc: String) -> String { + if doc.len() >= start { + doc.insert(start, '\n'); + } + doc + } +} diff --git a/src/actions/mod.rs b/src/actions/mod.rs new file mode 100644 index 0000000..b6eb7dc --- /dev/null +++ b/src/actions/mod.rs @@ -0,0 +1,8 @@ +pub(crate) mod delete; +pub(crate) mod insert; +pub(crate) mod linebreak; +pub(crate) mod paste; + +pub(crate) trait ActionRunner { + fn run(&self, start: usize, end: usize, data: Option, doc: String) -> String; +} diff --git a/src/actions/paste.rs b/src/actions/paste.rs new file mode 100644 index 0000000..c0f6d2c --- /dev/null +++ b/src/actions/paste.rs @@ -0,0 +1,18 @@ +use super::ActionRunner; + +pub(crate) struct InsertFromPaste; + +impl ActionRunner for InsertFromPaste { + fn run(&self, start: usize, end: usize, data: Option, mut doc: String) -> String { + if doc.len() < start || data.is_none() { + return doc; + } + + if start < end { + doc.replace_range(start..end, ""); + } + + doc.insert_str(start, &data.unwrap()); + doc + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..583ec66 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,57 @@ +use axum::routing::get; +use axum::Router; +use axum_extra::routing::SpaRouter; +use std::env; +use std::net::SocketAddr; +use std::sync::Arc; +use tokio::sync::{broadcast, RwLock}; +use tower_http::trace::TraceLayer; +use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; + +mod action; +mod actions; +mod ws; + +struct AppState { + doc: RwLock, + tx: broadcast::Sender, +} + +#[tokio::main] +async fn main() { + tracing_subscriber::registry() + .with( + tracing_subscriber::EnvFilter::try_from_default_env() + .unwrap_or_else(|_| "woweb_poc=debug,tower_http=debug".into()), + ) + .with(tracing_subscriber::fmt::layer()) + .init(); + + let (tx, _rx) = broadcast::channel(100); + let app_state = Arc::new(AppState { + doc: RwLock::new("".to_string()), + tx, + }); + + let app = Router::new() + .merge(SpaRouter::new("/", "assets").index_file("index.html")) + .route("/ws", get(ws::route)) + .with_state(app_state) + .layer(TraceLayer::new_for_http()); + + let args: Vec = env::args().collect(); + let host = if args.len() > 1 { + &args[1] + } else { + "127.0.0.1:3000" + }; + let addr = host + .parse() + .unwrap_or_else(|_| SocketAddr::from(([127, 0, 0, 1], 3000))); + tracing::debug!("listening on {}", addr); + + axum::Server::bind(&addr) + .serve(app.into_make_service()) + .await + .unwrap(); +} diff --git a/src/ws.rs b/src/ws.rs new file mode 100644 index 0000000..392aa9d --- /dev/null +++ b/src/ws.rs @@ -0,0 +1,77 @@ +use serde::{Deserialize, Serialize}; +use std::sync::Arc; + +use axum::{ + extract::{ + ws::{Message, WebSocket, WebSocketUpgrade}, + State, + }, + response::IntoResponse, +}; + +use futures::{sink::SinkExt, stream::StreamExt}; + +use crate::{action::Action, AppState}; + +#[derive(Serialize, Deserialize)] +struct NewState { + client: String, + doc: String, +} + +pub(crate) async fn route( + ws: WebSocketUpgrade, + State(state): State>, +) -> impl IntoResponse { + ws.on_upgrade(move |socket| handle_socket(socket, state)) +} + +async fn handle_socket(stream: WebSocket, state: Arc) { + let (mut sender, mut receiver) = stream.split(); + + { + let doc = state.doc.read().await; + let doc: String = doc.clone(); + let new_state = NewState { + client: String::from("0000"), + doc: doc.to_string(), + }; + let payload = serde_json::to_string(&new_state).unwrap(); + let _ = sender.send(Message::Text(payload)).await; + } + + let mut rx = state.tx.subscribe(); + + let mut send_task = tokio::spawn(async move { + while let Ok(msg) = rx.recv().await { + if sender.send(Message::Text(msg)).await.is_err() { + break; + } + } + }); + + let tx = state.tx.clone(); + let state = state.clone(); + let mut recv_task = tokio::spawn(async move { + while let Some(Ok(Message::Text(text))) = receiver.next().await { + if let Ok(action) = serde_json::from_str::(&text) { + let client = action.client.clone(); + action.execute(state.clone()).await; + + let doc = state.doc.read().await; + + let new_state = NewState { + client, + doc: doc.to_string(), + }; + let payload = serde_json::to_string(&new_state).unwrap(); + let _ = tx.send(payload); + } + } + }); + + tokio::select! { + _ = (&mut send_task) => recv_task.abort(), + _ = (&mut recv_task) => send_task.abort(), + }; +}