You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/fuso/src/observer
    
    the code of the file until where you have to start completion: use std::{future::Future, pin::Pin};

use serde_json::json;

use crate::{penetrate::PenetrateObserver, Executor, Observer};

type BoxedFuture = Pin<Box<dyn Future<Output = ()> + Send + 'static>>;

pub struct Executable<E> {
    prog: Option<String>,
    executor: E,
}

impl<E> Executable<E>
where
    E: Executor + 'static,
{
    pub fn new(prog: Option<String>, executor: E) -> Self {
        Self { prog, executor }
    }
}

impl<E> Executable<E>
where
    E: Executor,
{
    fn do_exec<S: ToString + Send + 'static>(&self, data: Vec<S>) -> BoxedFuture {
        let prog = self.prog.clone();
        Box::pin(async move {
            match prog {
                Some(prog) => {
                    let arg = data
                        .into_iter()
                        .map(|s| s.to_string())
                        .collect::<Vec<String>>();
                    let arg = &arg;

                    let proc = prog
                        .find(":[")
                        .map(|idx| prog.split_at(idx))
                        .map(|(prog, args)| {
                            let args = args
                                .trim_end_matches("]")
                                .trim_start_matches(":[")
                                .split(",");
                            let mut proc = std::process::Command::new(prog);
                            proc.args(args).args(arg);
                            proc
                        })
                        .unwrap_or_else(|| {
                            let mut proc = std::process::Command::new(prog);
                            proc.args(arg);
                            proc
                        })
                        .stdin(std::process::Stdio::null())
        
    
    fn do_exec<S: ToString + Send + 'static>(&self, data: Vec<S>) -> BoxedFuture {
        let prog = self.prog.clone();
        Box::pin(async move {
            match prog {
                Some(prog) => {
                    let arg = data
                        .into_iter()
                        .map(|s| s.to_string())
                        .collect::<Vec<String>>();
                    let arg = &arg;

                    let proc = prog
                        .find(":[")
                        .map(|idx| prog.split_at(idx))
                        .map(|(prog, args)| {
                            let args = args
                                .trim_end_matches("]")
                                .trim_start_matches(":[")
                                .split(",");
                            let mut proc = std::process::Command::new(prog);
                            proc.args(args).args(arg);
                            proc
                        })
                        .unwrap_or_else(|| {
                            let mut proc = std::process::Command::new(prog);
                            proc.args(arg);
                            proc
                        })
                        .stdin(std::process::Stdio::null())
                        .output();

                    match proc {
                        Ok(o) => {
                            let fmt = if o.status.success() {
                                String::from_utf8_lossy(&o.stdout)
                            } else {
                                String::from_utf8_lossy(&o.stderr)
                            };

                            log::debug!("{}", fmt);
                        }
                        Err(e) => {
                            log::warn!("notification failed {}", e);
                        }
                    }
                }
                None => {}
            }
        })
    }