terrazzo-terminal 0.2.7

A simple web-based terminal emulator built on Terrazzo.
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use std::sync::Arc;

use nameth::NamedEnumValues as _;
use nameth::nameth;
use scopeguard::defer;
use tonic::body::Body as BoxBody;
use tonic::client::GrpcService;
use tonic::codegen::Bytes;
use tonic::codegen::StdError;
use tonic::transport::Body;
use tracing::Instrument as _;
use tracing::debug;
use tracing::debug_span;
use trz_gateway_common::http_error::IsHttpError;

use crate::backend::Server;
use crate::backend::client_service::routing::DistributedCallback;
use crate::backend::client_service::routing::DistributedCallbackError;
use crate::backend::protos::terrazzo::shared::ClientAddress;
use crate::backend::protos::terrazzo::shared::Empty;
use crate::backend::protos::terrazzo::terminal::WriteRequest;
use crate::backend::protos::terrazzo::terminal::terminal_service_client::TerminalServiceClient;
use crate::processes;
use crate::processes::write::WriteError as WriteErrorImpl;

pub fn write(
    server: &Arc<Server>,
    client_address: &[impl AsRef<str>],
    request: WriteRequest,
) -> impl Future<Output = Result<(), WriteError>> {
    async move {
        debug!("Start");
        defer!(debug!("Done"));
        Ok(WriteCallback::process(server, client_address, request).await?)
    }
    .instrument(debug_span!("Write"))
}

struct WriteCallback;

impl DistributedCallback for WriteCallback {
    type Request = WriteRequest;
    type Response = ();
    type LocalError = WriteErrorImpl;
    type RemoteError = tonic::Status;

    async fn local(_: Option<&Arc<Server>>, request: WriteRequest) -> Result<(), WriteErrorImpl> {
        let terminal_id = request.terminal.unwrap_or_default().terminal_id.into();
        processes::write::write(&terminal_id, request.data.as_bytes()).await
    }

    async fn remote<T>(
        channel: T,
        client_address: &[impl AsRef<str>],
        mut request: WriteRequest,
    ) -> Result<(), tonic::Status>
    where
        T: GrpcService<BoxBody>,
        T::Error: Into<StdError>,
        T::ResponseBody: Body<Data = Bytes> + Send + 'static,
        <T::ResponseBody as Body>::Error: Into<StdError> + Send,
    {
        request.terminal.get_or_insert_default().via = Some(ClientAddress::of(client_address));
        let mut client = TerminalServiceClient::new(channel);
        let Empty {} = client.write(request).await?.into_inner();
        Ok(())
    }
}

#[nameth]
#[derive(thiserror::Error, Debug)]
pub enum WriteError {
    #[error("[{n}] {0}", n = self.name())]
    WriteError(#[from] DistributedCallbackError<WriteErrorImpl, tonic::Status>),
}

impl IsHttpError for WriteError {
    fn status_code(&self) -> terrazzo::http::StatusCode {
        match self {
            Self::WriteError(error) => error.status_code(),
        }
    }
}

impl From<WriteError> for tonic::Status {
    fn from(error: WriteError) -> Self {
        match error {
            WriteError::WriteError(error) => error.into(),
        }
    }
}

impl From<WriteErrorImpl> for tonic::Status {
    fn from(error: WriteErrorImpl) -> Self {
        match error {
            error @ WriteErrorImpl::TerminalNotFound { .. } => {
                tonic::Status::not_found(error.to_string())
            }
            WriteErrorImpl::Write(error) => tonic::Status::internal(error.to_string()),
        }
    }
}