watchmend 0.0.1

Watchmen is a daemon process manager that for you manage and keep your application online 24/7
Documentation 
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use std::{error::Error, path::PathBuf};

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Config {
    pub watchmen: Watchmen,
    pub sock: Sock,
    pub socket: Socket,
    pub http: Http,
    pub redis: Redis,
}

impl Config {
    pub fn init(path: Option<String>) -> Result<Config, Box<dyn Error>> {
        let path: PathBuf = if let Some(path) = path {
            PathBuf::from(path)
        } else {
            let home: PathBuf = match dirs::home_dir() {
                Some(p) => p,
                None => return Err("No home dir found".into()),
            };
            let config_path = home.join(".watchmen/config.toml");
            if config_path.exists() {
                config_path
            } else {
                // /etc/watchmen/config.toml
                let config_path = PathBuf::from("/etc/watchmen/config.toml");
                if config_path.exists() {
                    config_path
                } else {
                    return Err("No config file found".into());
                }
            }
        };
        let config: Config = Config::from(path)?;
        Ok(config)
    }
}

pub fn get_with_home(input: &str) -> String {
    let home_dir = dirs::home_dir().unwrap();
    let home_dir_str = home_dir.to_string_lossy().into_owned();
    if input.starts_with("$HOME") {
        let replaced = input.replace("$HOME", &home_dir_str);
        replaced
    } else if input.starts_with("~") {
        let replaced = input.replace("~", &home_dir_str);
        replaced
    } else {
        input.to_string()
    }
}

pub fn get_with_home_path(input: &str) -> PathBuf {
    PathBuf::from(get_with_home(input))
}

impl Config {
    fn from(s: PathBuf) -> Result<Self, Box<dyn Error>> {
        let config_str = std::fs::read_to_string(s)?;
        let mut config: Config = toml::from_str(&config_str)?;
        if let Some(log_dir) = &config.watchmen.log_dir {
            let log_dir = get_with_home_path(log_dir);
            if !log_dir.exists() {
                std::fs::create_dir_all(&log_dir)?;
            }
            config.watchmen.log_dir = Some(log_dir.to_str().unwrap().to_string());
        }
        if let Some(log_level) = &config.watchmen.log_level {
            let allowed = ["debug", "info", "warn", "error"];
            if !allowed.contains(&log_level.as_str()) {
                config.watchmen.log_level = Some("info".to_string());
            }
        }
        if let Some(stdout) = &config.watchmen.stdout {
            let stdout = get_with_home_path(stdout);
            let parent = stdout.parent().unwrap();
            if !parent.exists() {
                std::fs::create_dir_all(parent)?;
            }
            config.watchmen.stdout = Some(stdout.to_str().unwrap().to_string());
        }
        if let Some(stderr) = &config.watchmen.stderr {
            let stderr = get_with_home_path(stderr);
            let parent = stderr.parent().unwrap();
            if !parent.exists() {
                std::fs::create_dir_all(parent)?;
            }
            config.watchmen.stderr = Some(stderr.to_str().unwrap().to_string());
        }
        if let Some(pid) = &config.watchmen.pid {
            let pid = get_with_home_path(pid);
            let parent = pid.parent().unwrap();
            if !parent.exists() {
                std::fs::create_dir_all(parent)?;
            }
            config.watchmen.pid = Some(pid.to_str().unwrap().to_string());
        }
        if config.watchmen.mat.is_none() {
            config.watchmen.mat = Some(r"^.*\.(toml|ini|json)$".to_string());
        }
        let path = get_with_home_path(&config.sock.path);
        let parent = path.parent().unwrap();
        if !parent.exists() {
            std::fs::create_dir_all(parent)?;
        }
        config.sock.path = path.to_str().unwrap().to_string();
        Ok(config)
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Watchmen {
    pub engine: String,
    pub engines: Vec<String>,
    pub log_dir: Option<String>,
    pub log_level: Option<String>,
    pub stdout: Option<String>,
    pub stderr: Option<String>,
    pub pid: Option<String>,
    pub mat: Option<String>,
    pub cache: Option<String>,
    pub interval: Option<u64>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Sock {
    pub path: String,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Socket {
    pub host: String,
    pub port: u16,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Http {
    pub host: String,
    pub port: u16,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Redis {
    pub host: String,
    pub port: u16,
    pub username: String,
    pub password: String,
    pub queue_index: u8,
    pub queue_name: String,
    pub subscribe_channels: Vec<String>,
    pub subscribe_name: String,
}