snarkos-cli 4.6.4

// Copyright (c) 2019-2026 Provable Inc.
// This file is part of the snarkOS library.

// 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;
use tokio::sync::mpsc;

pub enum LogWriter {
    /// Writes to stdout.
    Stdout(io::Stdout),
    /// Writes to a channel.
    Sender(mpsc::Sender<Vec<u8>>),
}

impl LogWriter {
    /// Initialize a new log writer.
    pub fn new(log_sender: &Option<mpsc::Sender<Vec<u8>>>) -> Self {
        if let Some(sender) = log_sender { Self::Sender(sender.clone()) } else { Self::Stdout(io::stdout()) }
    }
}

impl io::Write for LogWriter {
    /// Writes the given buffer into the log writer.
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        match self {
            Self::Stdout(stdout) => stdout.write(buf),
            Self::Sender(sender) => {
                let log = buf.to_vec();
                let _ = sender.try_send(log);
                Ok(buf.len())
            }
        }
    }

    /// Flushes the log writer (no-op).
    fn flush(&mut self) -> io::Result<()> {
        Ok(())
    }
}