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docs: a ton of documentation

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əlemi 2023-08-20 00:46:55 +02:00
parent 1bc16ce9e4
commit 2ad5d4f6b0
9 changed files with 210 additions and 22 deletions
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22
src/buffer/controller.rs
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@ -1,3 +1,7 @@
//! ### controller
//!
//! a controller implementation for buffer actions
use operational_transform::OperationSeq;
use tokio::sync::{watch, mpsc, broadcast, Mutex};
use tonic::async_trait;
@ -8,6 +12,22 @@ use crate::buffer::factory::{leading_noop, tailing_noop, OperationFactory};
use super::TextChange;
/// the buffer controller implementation
///
/// this contains
/// * a watch channel which always contains an updated view of the buffer content
/// * a sink to send buffer operations into
/// * a mutexed broadcast receiver for buffer operations
/// * a channel to stop the associated worker
///
/// for each controller a worker exists, managing outgoing and inbound
/// queues, transforming outbound delayed ops and applying remote changes
/// to the local buffer
///
/// this controller implements [crate::buffer::OperationFactory], allowing to produce
/// Operation Sequences easily
///
/// upon dropping this handle will stop the associated worker
pub struct BufferController {
content: watch::Receiver<String>,
operations: mpsc::UnboundedSender<OperationSeq>,
@ -43,6 +63,7 @@ impl OperationFactory for BufferController {
impl Controller<TextChange> for BufferController {
type Input = OperationSeq;
/// receive an operation seq and transform it into a TextChange from buffer content
async fn recv(&self) -> Result<TextChange, Error> {
let op = self.stream.lock().await.recv().await?;
let after = self.content.borrow().clone();
@ -54,6 +75,7 @@ impl Controller<TextChange> for BufferController {
Ok(TextChange { span, content })
}
/// enqueue an opseq for processing
fn send(&self, op: OperationSeq) -> Result<(), Error> {
Ok(self.operations.send(op)?)
}

16
src/buffer/factory.rs
View file

@ -1,9 +1,17 @@
//! ### factory
//!
//! a helper trait to produce Operation Sequences, knowing the current
//! state of the buffer
use std::ops::Range;
use operational_transform::{OperationSeq, Operation};
use similar::{TextDiff, ChangeTag};
/// calculate leading no-ops in given opseq
pub const fn leading_noop(seq: &[Operation]) -> u64 { count_noop(seq.first()) }
/// calculate tailing no-ops in given opseq
pub const fn tailing_noop(seq: &[Operation]) -> u64 { count_noop(seq.last()) }
const fn count_noop(op: Option<&Operation>) -> u64 {
@ -14,19 +22,24 @@ const fn count_noop(op: Option<&Operation>) -> u64 {
}
}
/// return the range on which the operation seq is actually applying its changes
pub fn op_effective_range(op: &OperationSeq) -> Range<u64> {
let first = leading_noop(op.ops());
let last = op.base_len() as u64 - tailing_noop(op.ops());
first..last
}
/// a helper trait that any string container can implement, which generates opseqs
pub trait OperationFactory {
/// the current content of the buffer
fn content(&self) -> String;
/// completely replace the buffer with given text
fn replace(&self, txt: &str) -> Option<OperationSeq> {
self.delta(0, txt, self.content().len())
}
/// transform buffer in range [start..end] with given text
fn delta(&self, start: usize, txt: &str, end: usize) -> Option<OperationSeq> {
let mut out = OperationSeq::default();
let content = self.content();
@ -55,6 +68,7 @@ pub trait OperationFactory {
Some(out)
}
/// insert given chars at target position
fn insert(&self, txt: &str, pos: u64) -> OperationSeq {
let mut out = OperationSeq::default();
let total = self.content().len() as u64;
@ -64,6 +78,7 @@ pub trait OperationFactory {
out
}
/// delete n characters forward at given position
fn delete(&self, pos: u64, count: u64) -> OperationSeq {
let mut out = OperationSeq::default();
let len = self.content().len() as u64;
@ -73,6 +88,7 @@ pub trait OperationFactory {
out
}
/// delete n characters backwards at given position
fn cancel(&self, pos: u64, count: u64) -> OperationSeq {
let mut out = OperationSeq::default();
let len = self.content().len() as u64;

14
src/buffer/mod.rs
View file

@ -1,16 +1,30 @@
//! ### buffer
//!
//! a buffer is a container fo text edited by users.
//! this module contains buffer-related operations and helpers to create Operation Sequences
//! (the underlying chunks of changes sent over the wire)
use std::ops::Range;
pub(crate) mod worker;
/// buffer controller implementation
pub mod controller;
/// operation factory, with helper functions to produce opseqs
pub mod factory;
pub use factory::OperationFactory;
pub use controller::BufferController as Controller;
/// an editor-friendly representation of a text change in a buffer
///
/// TODO move in proto
#[derive(Debug)]
pub struct TextChange {
/// range of text change, as byte indexes in buffer
pub span: Range<usize>,
/// content of text change, as string
pub content: String,
}

26
src/client.rs
View file

@ -1,3 +1,7 @@
//! ### client
//!
//! codemp client manager, containing grpc services
use std::{sync::Arc, collections::BTreeMap};
use tonic::transport::Channel;
@ -11,6 +15,11 @@ use crate::{
};
/// codemp client manager
///
/// contains all required grpc services and the unique user id
/// will disconnect when dropped
/// can be used to interact with server
pub struct Client {
id: String,
client: Services,
@ -29,6 +38,7 @@ struct Workspace {
impl Client {
/// instantiate and connect a new client
pub async fn new(dst: &str) -> Result<Self, tonic::transport::Error> {
let buffer = BufferClient::connect(dst.to_string()).await?;
let cursor = CursorClient::connect(dst.to_string()).await?;
@ -37,15 +47,18 @@ impl Client {
Ok(Client { id, client: Services { buffer, cursor}, workspace: None })
}
/// return a reference to current cursor controller, if currently in a workspace
pub fn get_cursor(&self) -> Option<Arc<CursorController>> {
Some(self.workspace.as_ref()?.cursor.clone())
}
/// leave current workspace if in one, disconnecting buffer and cursor controllers
pub fn leave_workspace(&mut self) {
// TODO need to stop tasks?
self.workspace = None
}
/// disconnect from a specific buffer
pub fn disconnect_buffer(&mut self, path: &str) -> bool {
match &mut self.workspace {
Some(w) => w.buffers.remove(path).is_some(),
@ -53,10 +66,15 @@ impl Client {
}
}
/// get a new reference to a buffer controller, if any is active to given path
pub fn get_buffer(&self, path: &str) -> Option<Arc<BufferController>> {
self.workspace.as_ref()?.buffers.get(path).cloned()
}
/// join a workspace, starting a cursorcontroller and returning a new reference to it
///
/// to interact with such workspace [crate::Controller::send] cursor events or
/// [crate::Controller::recv] for events on the associated [crate::cursor::Controller].
pub async fn join(&mut self, _session: &str) -> Result<Arc<CursorController>, Error> {
// TODO there is no real workspace handling in codemp server so it behaves like one big global
// session. I'm still creating this to start laying out the proper use flow
@ -83,6 +101,7 @@ impl Client {
Ok(handle)
}
/// create a new buffer in current workspace, with optional given content
pub async fn create(&mut self, path: &str, content: Option<&str>) -> Result<(), Error> {
if let Some(_workspace) = &self.workspace {
self.client.buffer
@ -98,6 +117,13 @@ impl Client {
}
}
/// attach to a buffer, starting a buffer controller and returning a new reference to it
///
/// to interact with such buffer [crate::Controller::send] operation sequences
/// or [crate::Controller::recv] for text events using its [crate::buffer::Controller].
/// to generate operation sequences use the [crate::buffer::OperationFactory]
/// methods, which are implemented on [crate::buffer::Controller], such as
/// [crate::buffer::OperationFactory::delta].
pub async fn attach(&mut self, path: &str) -> Result<Arc<BufferController>, Error> {
if let Some(workspace) = &mut self.workspace {
let mut client = self.client.buffer.clone();

32
src/cursor/controller.rs
View file

@ -1,8 +1,23 @@
//! ### controller
//!
//! a controller implementation for cursor actions
use tokio::sync::{mpsc, broadcast::{self, error::RecvError}, Mutex};
use tonic::async_trait;
use crate::{proto::{CursorPosition, CursorEvent}, Error, Controller, errors::IgnorableError};
/// the cursor controller implementation
///
/// this contains
/// * the unique identifier of current user
/// * a sink to send movements into
/// * a mutex over a stream of inbound cursor events
/// * a channel to stop the associated worker
///
/// for each controller a worker exists, managing outgoing and inbound event queues
///
/// upon dropping this handle will stop the associated worker
pub struct CursorController {
uid: String,
op: mpsc::UnboundedSender<CursorEvent>,
@ -31,6 +46,7 @@ impl CursorController {
impl Controller<CursorEvent> for CursorController {
type Input = CursorPosition;
/// enqueue a cursor event to be broadcast to current workspace
fn send(&self, cursor: CursorPosition) -> Result<(), Error> {
Ok(self.op.send(CursorEvent {
user: self.uid.clone(),
@ -40,6 +56,7 @@ impl Controller<CursorEvent> for CursorController {
// TODO is this cancelable? so it can be used in tokio::select!
// TODO is the result type overkill? should be an option?
/// get next cursor event from current workspace, or block until one is available
async fn recv(&self) -> Result<CursorEvent, Error> {
let mut stream = self.stream.lock().await;
match stream.recv().await {
@ -51,19 +68,4 @@ impl Controller<CursorEvent> for CursorController {
}
}
}
// fn try_poll(&self) -> Option<Option<CursorPosition>> {
// match self.stream.try_lock() {
// Err(_) => None,
// Ok(mut x) => match x.try_recv() {
// Ok(x) => Some(Some(x)),
// Err(TryRecvError::Empty) => None,
// Err(TryRecvError::Closed) => Some(None),
// Err(TryRecvError::Lagged(n)) => {
// tracing::error!("cursor channel lagged behind, skipping {} events", n);
// Some(Some(x.try_recv().expect("could not receive after lagging")))
// }
// }
// }
// }
}

9
src/cursor/mod.rs
View file

@ -1,4 +1,11 @@
//! ### cursor
//!
//! each user holds a cursor, which consists of multiple highlighted region
//! on a specific buffer
pub(crate) mod worker;
/// cursor controller implementation
pub mod controller;
pub use controller::CursorController as Controller;
@ -18,10 +25,12 @@ impl From::<(i32, i32)> for RowCol {
}
impl CursorPosition {
/// extract start position, defaulting to (0,0)
pub fn start(&self) -> RowCol {
self.start.clone().unwrap_or((0, 0).into())
}
/// extract end position, defaulting to (0,0)
pub fn end(&self) -> RowCol {
self.end.clone().unwrap_or((0, 0).into())
}

14
src/errors.rs
View file

@ -1,9 +1,14 @@
//! ### Errors
//!
//! library error helpers and types
use std::{result::Result as StdResult, error::Error as StdError, fmt::Display};
use tokio::sync::{mpsc, broadcast};
use tonic::{Status, Code};
use tracing::warn;
/// an error which can be ignored with just a warning entry
pub trait IgnorableError {
fn unwrap_or_warn(self, msg: &str);
}
@ -18,24 +23,29 @@ where E : std::fmt::Display {
}
}
/// result type for codemp errors
pub type Result<T> = StdResult<T, Error>;
// TODO split this into specific errors for various parts of the library
/// codemp error type for library issues
#[derive(Debug)]
pub enum Error {
/// errors caused by tonic http layer
Transport {
status: Code,
message: String,
},
/// errors caused by async channels
Channel {
send: bool
},
/// errors caused by wrong usage of library objects
InvalidState {
msg: String,
},
// TODO filler error, remove later
Filler {
/// if you see these errors someone is being lazy (:
Filler { // TODO filler error, remove later
message: String,
},
}

95
src/lib.rs
View file

@ -3,18 +3,102 @@
//! This is the core library of the codemp project.
//!
//! ## Structure
//! The main entrypoint is the [client::Client] object, that maintains a connection and can
//! The main entrypoint is the [Client] object, that maintains a connection and can
//! be used to join workspaces or attach to buffers.
//!
//! Some actions will return structs implementing the [Controller] trait. These can be polled
//! for new stream events, which will be returned in order. Blocking and callback variants are also
//! implemented. The [Controller] can also be used to send new events to the server.
//! for new stream events ([Controller::recv]), which will be returned in order. Blocking and
//! callback variants are also implemented. The [Controller] can also be used to send new
//! events to the server ([Controller::send]).
//!
//! Each operation on a buffer is represented as an [ot::OperationSeq].
//! A visualization about how OperationSeqs work is available
//! [here](http://operational-transformation.github.io/index.html),
//! but to use this library it's only sufficient to know that they can only
//! be applied on buffers of some length and are transformable to be able to be
//! applied in a different order while maintaining the same result.
//!
//! To generate Operation Sequences use helper methods from the trait [buffer::OperationFactory].
//!
//! ## Features
//! * `proto` : include GRCP protocol definitions under [proto] (default)
//! * `global`: provide a lazy_static global INSTANCE in [instance::global]
//! * `sync` : wraps the [instance::a_sync::Instance] holder into a sync variant: [instance::sync::Instance]
//!
//! ## Example
//! library can be used both sync and async depending on wether the `sync` feature flag has been
//! enabled. a global `INSTANCE` static reference can also be made available with the `global`
//! flag.
//!
//! ### Async
//! ```no_run
//! async fn async_example() -> codemp::Result<()> {
//! // create global instance
//! let codemp = codemp::Instance::default();
//!
//! // connect to a remote server
//! codemp.connect("http://alemi.dev:50051").await?;
//!
//! // join a remote workspace, obtaining a cursor controller
//! let cursor = codemp.join("some_workspace").await?;
//!
//! // move cursor
//! cursor.send(
//! codemp::proto::CursorPosition {
//! buffer: "test.txt".into(),
//! start: Some(codemp::proto::RowCol { row: 0, col: 0 }),
//! end: Some(codemp::proto::RowCol { row: 0, col: 1 }),
//! }
//! )?;
//!
//! // listen for event
//! let op = cursor.recv().await?;
//! println!("received cursor event: {:?}", op);
//!
//! // create a new buffer
//! codemp.create("test.txt", None).await?;
//!
//! // attach to created buffer
//! let buffer = codemp.attach("test.txt").await?;
//!
//! // sending operation
//! if let Some(delta) = buffer.delta(0, "hello", 0) {
//! buffer.send(delta).expect("could not enqueue operation");
//! }
//!
//! if let Some(delta) = buffer.delta(4, "o world", 5) {
//! buffer.send(delta).expect("could not enqueue operation");
//! }
//!
//! Ok(())
//! }
//! ```
//!
//! ### Sync
//!
//! ```no_run
//! // activate feature "global" to access static CODEMP_INSTANCE
//! use codemp::instance::global::INSTANCE;
//!
//! fn sync_example() -> Result<()> {
//! // connect to remote server
//! INSTANCE.connect("http://alemi.dev:50051")?;
//!
//! // join workspace
//! let cursor = INSTANCE.join("some_workspace")?;
//!
//! let (stop, stop_rx) = tokio::sync::mpsc::unbounded_channel();
//! Arc::new(cursor).callback(
//! INSTANCE.rt(),
//! stop_rx,
//! | cursor_event | {
//! println!("received cursor event: {:?}", cursor_event);
//! }
//! );
//!
//! Ok(())
//! }
//! ```
/// cursor related types and controller
@ -99,7 +183,7 @@ pub trait Controller<T : Sized + Send + Sync> : Sized + Send + Sync {
/// preventing it from being dropped (and likely disconnecting). using the stop channel is
/// important for proper cleanup
fn callback<F>(
self: Arc<Self>,
self: &Arc<Self>,
rt: &tokio::runtime::Runtime,
mut stop: tokio::sync::mpsc::UnboundedReceiver<()>,
mut cb: F
@ -107,10 +191,11 @@ pub trait Controller<T : Sized + Send + Sync> : Sized + Send + Sync {
Self : 'static,
F : FnMut(T) + Sync + Send + 'static
{
let _self = self.clone();
rt.spawn(async move {
loop {
tokio::select! {
Ok(data) = self.recv() => cb(data),
Ok(data) = _self.recv() => cb(data),
Some(()) = stop.recv() => break,
else => break,
}

4
src/prelude.rs
View file

@ -1,3 +1,7 @@
//! ### Prelude
//!
//! all-in-one renamed imports with `use codemp::prelude::*`
pub use crate::{
Error as CodempError,
Result as CodempResult,