Format Rust code using rustfmt

\\?\D:\a\rexec\rexec\src\main.rs

@@ -0,0 +1,404 @@
+#[macro_use]
+extern crate log;
+
+use std::collections::HashMap;
+use std::fs::read_to_string;
+use std::hash::Hash;
+use std::net::IpAddr;
+use std::process;
+use std::sync::{Arc, Mutex};
+
+use clap::Parser;
+use colored::*;
+use dns_lookup::lookup_host;
+use env_logger::Env;
+use itertools::Itertools;
+use log::{error, info, warn};
+use massh::{MasshClient, MasshConfig, MasshHostConfig, SshAuth};
+use question::{Answer, Question};
+use rayon::prelude::*;
+use regex::Regex;
+
+// Define args
+#[derive(Parser, Debug)]
+#[command(author = "AB ab@hexor.ru", version, about = "Parallel SSH executor in Rust", long_about = None)]
+struct Args {
+    #[arg(short, long, default_value_t = whoami::username())]
+    username: String,
+
+    #[arg(
+        short,
+        long,
+        help = "Use known_hosts to build servers list instead of string expansion."
+    )]
+    known_hosts: bool,
+
+    #[arg(
+        short,
+        long,
+        num_args = 1..,
+        help = "Expression to build server list. List and range expansion are supported. Example: 'web-[1:12]-io-{prod,dev}'"
+    )]
+    expression: Vec<String>,
+
+    #[arg(short, long, help = "Command to execute on servers")]
+    command: String,
+
+    #[arg(long, default_value_t = false, help = "Show exit code ONLY")]
+    code: bool,
+
+    #[arg(
+        short = 'f',
+        long,
+        default_value_t = false,
+        help = "Don't ask for confirmation"
+    )]
+    noconfirm: bool,
+
+    #[arg(short, long, default_value_t = 100)]
+    parallel: i32,
+}
+
+// Represent line from known_hosts file
+#[derive(Debug, Default, Clone, PartialEq, Eq, Hash)]
+struct Host {
+    name: String,
+    ip: Option<IpAddr>,
+}
+
+// Read known_hosts file
+fn read_known_hosts() -> Vec<Host> {
+    let mut result: Vec<Host> = Vec::new();
+
+    for line in read_to_string(format!("/home/{}/.ssh/known_hosts", whoami::username()))
+        .unwrap()
+        .lines()
+    {
+        let line = line.split(" ").collect::<Vec<&str>>();
+        let hostname = line[0];
+        result.push(Host {
+            name: hostname.to_string(),
+            ip: None,
+        })
+    }
+    result
+}
+
+fn expand_range(start: i32, end: i32) -> Vec<String> {
+    (start..=end).map(|i| i.to_string()).collect()
+}
+
+fn expand_list(list: &str) -> Vec<String> {
+    list.split(',').map(|s| s.to_string()).collect()
+}
+
+fn expand_string(s: &str) -> Vec<Host> {
+    let mut hosts: Vec<Host> = Vec::new();
+    let mut result = vec![s.to_string()];
+
+    while let Some(r) = result.iter().find(|s| s.contains('[')) {
+        let r = r.clone();
+        let start = r.find('[').unwrap();
+        let end = match r[start..].find(']') {
+            None => {
+                error!("Error parsing host expression. Wrong range expansion '[a:b]'");
+                process::exit(1);
+            }
+            Some(s) => s + start,
+        };
+        let colon = match r[start..end].find(':') {
+            None => {
+                error!("Error parsing host expression. Missing colon in range expansion '[a:b]'");
+                process::exit(1);
+            }
+            Some(c) => c + start,
+        };
+        let low = r[start + 1..colon].parse::<i32>().unwrap();
+        let high = r[colon + 1..end].parse::<i32>().unwrap();
+        result.retain(|s| s != &r);
+        for val in expand_range(low, high) {
+            let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
+            result.push(new_str);
+        }
+    }
+
+    while let Some(r) = result.iter().find(|s| s.contains('{')) {
+        let r = r.clone();
+        let start = r.find('{').unwrap();
+        let end = match r.find('}') {
+            None => {
+                error!("Error parsing host expression. Wrong range expansion '{{one,two}}'");
+                process::exit(1);
+            }
+            Some(s) => s,
+        };
+        let list = &r[start + 1..end];
+        result.retain(|s| s != &r);
+        for val in expand_list(list) {
+            let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
+            result.push(new_str);
+        }
+    }
+
+    for hostname in result {
+        hosts.push(Host {
+            name: hostname.to_string(),
+            ip: None,
+        })
+    }
+    hosts
+}
+
+fn main() {
+    env_logger::Builder::from_env(Env::default().default_filter_or("info"))
+        .format_timestamp(None)
+        .format_target(false)
+        .init();
+    let args = Args::parse();
+
+    let hosts = if args.known_hosts {
+        info!("Using ~/.ssh/known_hosts to build server list.");
+        let known_hosts = read_known_hosts();
+        let mut all_hosts = Vec::new();
+        for expression in args.expression.iter() {
+            let re = match Regex::new(expression) {
+                Ok(result) => result,
+                Err(e) => {
+                    error!("Error parsing regex. {}", e);
+                    process::exit(1);
+                }
+            };
+            let matched: Vec<Host> = known_hosts
+                .clone()
+                .into_iter()
+                .filter(|r| re.is_match(&r.name.clone()))
+                .collect();
+            all_hosts.extend(matched);
+        }
+        all_hosts
+    } else {
+        info!("Using string expansion to build server list.");
+        let mut all_hosts = Vec::new();
+        for expression in args.expression.iter() {
+            all_hosts.extend(expand_string(expression));
+        }
+        all_hosts
+    };
+
+    // Dedup hosts from known_hosts file but preserve original order
+    let matched_hosts: Vec<_> = hosts.into_iter().unique().collect();
+
+    // Build MasshHostConfig hostnames list
+    if args.parallel != 100 {
+        warn!("Parallelism: {} thread{}", &args.parallel, {
+            if args.parallel != 1 {
+                "s."
+            } else {
+                "."
+            }
+        });
+    }
+
+    // Store hosts with their indices to preserve order
+    let mut host_with_indices: Vec<(Host, usize)> = Vec::new();
+    for (idx, host) in matched_hosts.iter().enumerate() {
+        host_with_indices.push((host.clone(), idx));
+    }
+
+    info!("Matched hosts:");
+
+    // Do DNS resolution in parallel but store results for ordered display later
+    let resolved_ips_with_indices = Arc::new(Mutex::new(Vec::<(String, IpAddr, usize)>::new()));
+
+    host_with_indices
+        .par_iter()
+        .for_each(|(host, idx)| match lookup_host(&host.name) {
+            Ok(ips) if !ips.is_empty() => {
+                let ip = ips[0];
+                let mut results = resolved_ips_with_indices.lock().unwrap();
+                results.push((host.name.clone(), ip, *idx));
+            }
+            Ok(_) => {
+                let mut results = resolved_ips_with_indices.lock().unwrap();
+                results.push((
+                    host.name.clone(),
+                    IpAddr::V4(std::net::Ipv4Addr::new(0, 0, 0, 0)),
+                    *idx,
+                ));
+            }
+            Err(_) => {
+                let mut results = resolved_ips_with_indices.lock().unwrap();
+                results.push((
+                    host.name.clone(),
+                    IpAddr::V4(std::net::Ipv4Addr::new(0, 0, 0, 0)),
+                    *idx,
+                ));
+            }
+        });
+
+    // Sort by original index to ensure hosts are displayed in order
+    let mut resolved_hosts = resolved_ips_with_indices.lock().unwrap().clone();
+    resolved_hosts.sort_by_key(|(_, _, idx)| *idx);
+
+    // Now print the hosts in the correct order
+    for (hostname, ip, _) in &resolved_hosts {
+        if ip.is_unspecified() {
+            error!("DNS resolve failed: {}", hostname.red());
+        } else {
+            info!("{} [{}]", hostname, ip);
+        }
+    }
+
+    // Create massh_hosts in the correct order
+    let mut hosts_and_ips: HashMap<IpAddr, (String, usize)> = HashMap::new();
+    let mut massh_hosts: Vec<MasshHostConfig> = Vec::new();
+
+    for (hostname, ip, idx) in resolved_hosts {
+        // Skip hosts that couldn't be resolved
+        if !ip.is_unspecified() {
+            hosts_and_ips.insert(ip, (hostname.clone(), idx));
+            massh_hosts.push(MasshHostConfig {
+                addr: ip,
+                auth: None,
+                port: None,
+                user: None,
+            });
+        }
+    }
+
+    // Process hosts in batches to maintain order
+    let batch_size = args.parallel as usize;
+
+    // Ask for confirmation
+    if !massh_hosts.is_empty()
+        && (args.noconfirm
+            || match Question::new(&*format!(
+                "Continue on following {} servers?",
+                &massh_hosts.len()
+            ))
+            .confirm()
+            {
+                Answer::YES => true,
+                Answer::NO => false,
+                _ => unreachable!(),
+            })
+    {
+        info!("Run command on {} servers.", &massh_hosts.len());
+
+        let mut processed = 0;
+
+        while processed < massh_hosts.len() {
+            let end = std::cmp::min(processed + batch_size, massh_hosts.len());
+
+            // Create a new config and vector for this batch
+            let mut batch_hosts = Vec::new();
+            for host in &massh_hosts[processed..end] {
+                batch_hosts.push(MasshHostConfig {
+                    addr: host.addr,
+                    auth: None,
+                    port: None,
+                    user: None,
+                });
+            }
+
+            // Create a new MasshClient for this batch
+            let batch_config = MasshConfig {
+                default_auth: SshAuth::Agent,
+                default_port: 22,
+                default_user: args.username.clone(),
+                threads: batch_hosts.len() as u64,
+                timeout: 0,
+                hosts: batch_hosts,
+            };
+
+            let batch_massh = MasshClient::from(&batch_config);
+
+            // Run commands on this batch
+            let rx = batch_massh.execute(args.command.clone());
+
+            // Collect all results from this batch before moving to the next
+            let mut batch_results = Vec::new();
+
+            while let Ok((host, result)) = rx.recv() {
+                let ip: String = host.split('@').collect::<Vec<_>>()[1]
+                    .split(':')
+                    .collect::<Vec<_>>()[0]
+                    .to_string();
+                let ip = ip.parse::<IpAddr>().unwrap();
+
+                if let Some((hostname, idx)) = hosts_and_ips.get(&ip) {
+                    batch_results.push((hostname.clone(), ip, result, *idx));
+                } else {
+                    error!("Unexpected IP address in result: {}", ip);
+                }
+            }
+
+            // Sort the batch results by index to ensure they're displayed in order
+            batch_results.sort_by_key(|(_, _, _, idx)| *idx);
+
+            // Display the results
+            for (hostname, _ip, result, _) in batch_results {
+                println!("\n{}", hostname.yellow().bold().to_string());
+
+                let output = match result {
+                    Ok(output) => output,
+                    Err(e) => {
+                        error!("Can't access server: {}", e);
+                        continue;
+                    }
+                };
+
+                let code_string = if output.exit_status == 0 {
+                    format!("{}", output.exit_status.to_string().green())
+                } else {
+                    format!("{}", output.exit_status.to_string().red())
+                };
+
+                println!(
+                    "{}",
+                    format!(
+                        "Exit code [{}] / stdout {} bytes / stderr {} bytes",
+                        code_string,
+                        output.stdout.len(),
+                        output.stderr.len()
+                    )
+                    .bold()
+                );
+
+                if !args.code {
+                    match String::from_utf8(output.stdout) {
+                        Ok(stdout) => match stdout.as_str() {
+                            "" => {}
+                            _ => {
+                                let prefix = if output.exit_status != 0 {
+                                    format!("{}", "│".cyan())
+                                } else {
+                                    format!("{}", "│".green())
+                                };
+                                for line in stdout.lines() {
+                                    println!("{} {}", prefix, line);
+                                }
+                            }
+                        },
+                        Err(_) => {}
+                    }
+                    match String::from_utf8(output.stderr) {
+                        Ok(stderr) => match stderr.as_str() {
+                            "" => {}
+                            _ => {
+                                for line in stderr.lines() {
+                                    println!("{} {}", "║".red(), line);
+                                }
+                            }
+                        },
+                        Err(_) => {}
+                    }
+                }
+            }
+
+            processed = end;
+        }
+    } else {
+        warn!("Stopped");
+    }
+}