libshpool 0.10.0

// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::{io, path::PathBuf};

use anyhow::Context;
use shpool_protocol::{ConnectHeader, ListReply};

use crate::{protocol, protocol::ClientResult};

pub fn run(socket: PathBuf, json_output: bool) -> anyhow::Result<()> {
    let mut client = match protocol::Client::new(socket) {
        Ok(ClientResult::JustClient(c)) => c,
        Ok(ClientResult::VersionMismatch { warning, client }) => {
            eprintln!("warning: {warning}, try restarting your daemon");
            client
        }
        Err(err) => {
            let io_err = err.downcast::<io::Error>()?;
            if io_err.kind() == io::ErrorKind::NotFound {
                eprintln!("could not connect to daemon");
            }
            return Err(io_err).context("connecting to daemon");
        }
    };

    client.write_connect_header(ConnectHeader::List).context("sending list connect header")?;
    let reply: ListReply = client.read_reply().context("reading reply")?;

    if json_output {
        println!("{}", serde_json::to_string_pretty(&reply)?);
    } else {
        let longest_session_name_len =
            reply.sessions.iter().map(|s| s.name.len()).max().unwrap_or(0);

        println!("NAME\tSTATUS");
        for session in reply.sessions.iter() {
            let mut name = session.name.clone();
            while name.len() < longest_session_name_len {
                name.push(' ');
            }
            println!("{}\t{}", name, session.status);
        }
    }

    Ok(())
}