mirror of https://github.com/chipsenkbeil/distant
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347 lines
12 KiB
Rust
347 lines
12 KiB
Rust
use std::io;
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use std::sync::Arc;
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use async_trait::async_trait;
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use tokio::sync::mpsc;
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use crate::api::{
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Api, Ctx, FileSystemApi, ProcessApi, SearchApi, SystemInfoApi, VersionApi, WatchApi,
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};
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use crate::common::{Request, Response, Stream};
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use crate::protocol;
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mod err;
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mod ext;
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pub use err::{ClientError, ClientResult};
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pub use ext::ClientExt;
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/// Full API for a distant-compatible client.
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#[async_trait]
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pub trait Client {
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/// Sends a request and returns a stream of responses, failing if unable to send a request or
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/// if the session's receiving line to the remote server has already been severed.
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async fn send(&mut self, request: Request) -> io::Result<Box<dyn Stream<Item = Response>>>;
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/// Sends a request and waits for a single response, failing if unable to send a request or if
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/// the session's receiving line to the remote server has already been severed.
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async fn ask(&mut self, request: Request) -> io::Result<Response> {
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self.send(request)
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.await?
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.next()
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.await
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.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "Stream has closed"))
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}
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/// Sends a request without waiting for any response; this method is able to be used even
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/// if the session's receiving line to the remote server has been severed.
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async fn fire(&mut self, request: Request) -> io::Result<()> {
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let _ = self.ask(request).await?;
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Ok(())
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}
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}
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/// Represents a bridge between a [`Client`] and an [`Api`] implementation that maps requests to
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/// the API and forwards responses back.
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///
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/// This can be used to run an Api implementation locally, such as when you want to translate some
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/// other platform (e.g. ssh, docker) into a distant-compatible form.
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct ClientBridge<T: Api> {
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api: Arc<T>,
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}
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impl<T: Api> ClientBridge<T> {
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/// Creates a new bridge wrapping around the provided api.
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pub fn new(api: T) -> Self {
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Self { api: Arc::new(api) }
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}
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}
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#[async_trait]
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impl<T: Api + 'static> Client for ClientBridge<T> {
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async fn send(&mut self, request: Request) -> io::Result<Box<dyn Stream<Item = Response>>> {
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struct __Ctx(u32, mpsc::UnboundedSender<Response>);
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impl Ctx for __Ctx {
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fn connection(&self) -> u32 {
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self.0
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}
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fn clone_ctx(&self) -> Box<dyn Ctx> {
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Box::new(__Ctx(self.0, self.1.clone()))
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}
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fn send(&self, msg: protocol::Msg<protocol::Response>) -> io::Result<()> {
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self.1
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.send(msg)
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.map_err(|_| io::Error::new(io::ErrorKind::Other, "Bridge has closed"))
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}
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}
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let (tx, rx) = mpsc::unbounded_channel();
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let ctx = Box::new(__Ctx(rand::random(), tx));
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// Spawn a task that will perform the request using the api. We use a task to allow the
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// async engine to not get blocked awaiting immediately for the response to arrive before
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// returning the stream of responses.
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tokio::task::spawn({
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let api = Arc::clone(&self.api);
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async move {
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let response = {
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let ctx = ctx.clone_ctx();
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handle_request(api, ctx, request).await
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};
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let _ = ctx.send(response);
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}
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});
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Ok(Box::new(rx))
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}
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}
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async fn handle_request<T>(api: Arc<T>, ctx: Box<dyn Ctx>, request: Request) -> Response
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where
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T: Api,
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{
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let origin = request.id;
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let sequence = request.flags.sequence;
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Response {
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id: rand::random(),
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origin,
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payload: match request.payload {
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protocol::Msg::Single(request) => {
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protocol::Msg::Single(handle_protocol_request(api, ctx, request).await)
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}
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protocol::Msg::Batch(requests) if sequence => {
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let mut responses = Vec::new();
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for request in requests {
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responses.push(
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handle_protocol_request(Arc::clone(&api), ctx.clone_ctx(), request).await,
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);
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}
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protocol::Msg::Batch(responses)
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}
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protocol::Msg::Batch(requests) => {
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let mut responses = Vec::new();
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for request in requests {
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responses.push(
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handle_protocol_request(Arc::clone(&api), ctx.clone_ctx(), request).await,
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);
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}
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protocol::Msg::Batch(responses)
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}
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},
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}
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}
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/// Processes a singular protocol request using the provided api and ctx.
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async fn handle_protocol_request<T>(
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api: Arc<T>,
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ctx: Box<dyn Ctx>,
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request: protocol::Request,
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) -> protocol::Response
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where
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T: Api,
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{
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match request {
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protocol::Request::Version {} => {
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let api = api.version();
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api.version(ctx)
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.await
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.map(protocol::Response::Version)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileRead { path } => {
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let api = api.file_system();
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api.read_file(ctx, path)
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.await
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.map(|data| protocol::Response::Blob { data })
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileReadText { path } => {
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let api = api.file_system();
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api.read_file_text(ctx, path)
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.await
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.map(|data| protocol::Response::Text { data })
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileWrite { path, data } => {
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let api = api.file_system();
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api.write_file(ctx, path, data)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileWriteText { path, text } => {
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let api = api.file_system();
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api.write_file_text(ctx, path, text)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileAppend { path, data } => {
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let api = api.file_system();
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api.append_file(ctx, path, data)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::FileAppendText { path, text } => {
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let api = api.file_system();
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api.append_file_text(ctx, path, text)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::DirRead {
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path,
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depth,
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absolute,
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canonicalize,
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include_root,
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} => {
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let api = api.file_system();
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api.read_dir(ctx, path, depth, absolute, canonicalize, include_root)
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.await
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.map(|(entries, errors)| protocol::Response::DirEntries {
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entries,
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errors: errors.into_iter().map(protocol::Error::from).collect(),
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})
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::DirCreate { path, all } => {
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let api = api.file_system();
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api.create_dir(ctx, path, all)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Remove { path, force } => {
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let api = api.file_system();
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api.remove(ctx, path, force)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Copy { src, dst } => {
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let api = api.file_system();
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api.copy(ctx, src, dst)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Rename { src, dst } => {
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let api = api.file_system();
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api.rename(ctx, src, dst)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Watch {
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path,
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recursive,
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only,
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except,
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} => {
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let api = api.watch();
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api.watch(ctx, path, recursive, only, except)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Unwatch { path } => {
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let api = api.watch();
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api.unwatch(ctx, path)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Exists { path } => {
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let api = api.file_system();
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api.exists(ctx, path)
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.await
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.map(|value| protocol::Response::Exists { value })
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Metadata {
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path,
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canonicalize,
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resolve_file_type,
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} => {
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let api = api.file_system();
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api.metadata(ctx, path, canonicalize, resolve_file_type)
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.await
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.map(protocol::Response::Metadata)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::SetPermissions {
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path,
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permissions,
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options,
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} => {
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let api = api.file_system();
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api.set_permissions(ctx, path, permissions, options)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::Search { query } => {
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let api = api.search();
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api.search(ctx, query)
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.await
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.map(|id| protocol::Response::SearchStarted { id })
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::CancelSearch { id } => {
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let api = api.search();
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api.cancel_search(ctx, id)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::ProcSpawn {
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cmd,
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environment,
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current_dir,
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pty,
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} => {
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let api = api.process();
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api.proc_spawn(ctx, cmd.into(), environment, current_dir, pty)
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.await
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.map(|id| protocol::Response::ProcSpawned { id })
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::ProcKill { id } => {
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let api = api.process();
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api.proc_kill(ctx, id)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::ProcStdin { id, data } => {
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let api = api.process();
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api.proc_stdin(ctx, id, data)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::ProcResizePty { id, size } => {
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let api = api.process();
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api.proc_resize_pty(ctx, id, size)
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.await
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.map(|_| protocol::Response::Ok)
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.unwrap_or_else(protocol::Response::from)
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}
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protocol::Request::SystemInfo {} => {
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let api = api.system_info();
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api.system_info(ctx)
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.await
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.map(protocol::Response::SystemInfo)
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.unwrap_or_else(protocol::Response::from)
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}
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}
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}
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