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use super::child::{child_output::OutputMode, Config};
use super::client;
use super::keys_handler::*;
use super::kindergarten::*;
use super::logger;
use super::timer::*;
use chrono::prelude::*;
use openssl::rsa::*;
use std::collections::HashSet;
use std::fs;
use std::fs::{File, OpenOptions};
use std::io::{Error as ioError, ErrorKind, Read, Result, Write};
use std::net::{TcpListener, TcpStream};
use std::process::{Child, Command};
use std::sync::mpsc::Sender;
use std::thread;
use yaml_rust::YamlLoader;
use std::sync::{Arc, Mutex};
/// Server config
#[derive(Debug)]
struct ServerConfig {
/// paths for all children's configs
load_paths: Vec<String>,
/// startup mode
/// + half
/// + full
/// + quiet (default)
mode: String,
/// The list of children want to start up with server
startup_list: Option<Vec<String>>,
/// encrypt mode
encrypt_mode: String,
/// client public keys location
keys_path: Option<Vec<String>>,
/// Listener address
/// default is 0.0.0.0, ipv4
listener_addr: String,
/// Enable ipv6 or not, only used when listener_addr
/// isn't given in yaml file. If listener_addr appears in yaml,
/// this field doesn't matter.
/// If listener_addr isn't given and this field is true,
/// listener_addr will become ::
ipv6: bool,
}
impl ServerConfig {
/// load server config
fn load(filepath: &str) -> Result<Self> {
let mut contents = File::open(filepath)?;
let mut string_result = String::new();
contents.read_to_string(&mut string_result)?;
Self::read_from_str(string_result.as_str())
}
/// read content of config file then making config
fn read_from_str(input: &str) -> Result<Self> {
let temp = YamlLoader::load_from_str(input);
let mut result: Self = ServerConfig {
load_paths: vec![],
// quiet mode is default value now
mode: "quiet".to_string(),
startup_list: None,
encrypt_mode: "off".to_string(),
keys_path: None,
listener_addr: "0.0.0.0".to_string(),
ipv6: false,
};
match temp {
Ok(docs) => {
let doc = &docs[0];
// load path parse
let paths = match doc["loadpaths"].as_vec() {
Some(v) => v
.iter()
.map(|x| x.clone().into_string().unwrap())
.collect::<Vec<String>>(),
None => vec![],
};
result.load_paths = paths;
// mode parse
let mode = match doc["mode"].as_str() {
Some(v) => v.to_string(),
None => "quiet".to_string(),
};
result.mode = mode;
// startup parse
let startup_children = match doc["startup"].as_vec() {
Some(v) => Some(
v.iter()
.map(|x| x.clone().into_string().unwrap())
.collect::<Vec<String>>(),
),
None => None,
};
result.startup_list = startup_children;
// encrypt parse
let encrypt = match doc["encrypt"].as_str() {
Some(v) => v.to_string(),
None => "off".to_string(),
};
result.encrypt_mode = encrypt;
// keys path parse
let keys_paths = match doc["pub_keys_path"].as_vec() {
Some(v) => Some(
v.iter()
.map(|x| x.clone().into_string().unwrap())
.collect::<Vec<String>>(),
),
None => None,
};
result.keys_path = keys_paths;
// ipv6
let p6 = match doc["ipv6"].as_bool() {
Some(b) => b,
None => false,
};
result.ipv6 = p6;
// listener part
let listener_addr = match doc["listener_addr"].as_str() {
Some(addr) => addr.to_string(),
None => {
if !p6 {
"0.0.0.0".to_string()
} else {
"::".to_string()
}
}
};
result.listener_addr = listener_addr;
}
Err(e) => return Err(ioError::new(ErrorKind::Other, e)),
}
Ok(result)
}
/// when mode == "half"
/// it should return all children details those in loadpaths also
/// in startup field of server config.
fn half_mode(&self) -> Result<Vec<(String, String)>> {
let children_set = match &self.startup_list {
Some(startups) => startups.iter().collect::<HashSet<&String>>(),
None => return Err(ioError::new(ErrorKind::NotFound, "startup list not found")),
};
let all_children = self.all_ymls_in_load_path()?;
let result = all_children
.into_iter()
.filter(|x| children_set.contains(&x.0))
.collect::<Vec<(String, String)>>();
Ok(result)
}
/// Return all children configs. Vec of (filename, path)
fn all_ymls_in_load_path(&self) -> Result<Vec<(String, String)>> {
let mut result: Vec<(String, String)> = vec![];
for path in self.load_paths.clone() {
for entry in fs::read_dir(path)? {
if let Ok(entry) = entry {
if let Some(extension) = entry.path().extension() {
if extension == "yml" || extension == "yaml" {
result.push((
entry
.file_name()
.to_str()
.unwrap()
.split('.')
.collect::<Vec<&str>>()[0]
.to_string(),
entry.path().to_str().unwrap().to_string(),
));
}
}
}
}
}
Ok(result)
}
/// Return config which match filename
fn find_config_by_name(&self, filename: &String) -> Result<Config> {
for path in self.load_paths.clone() {
for entry in fs::read_dir(path)? {
if let Ok(entry) = entry {
if let Some(extension) = entry.path().extension() {
if extension == "yml" || extension == "yaml" {
if entry
.file_name()
.to_str()
.unwrap()
.split('.')
.collect::<Vec<&str>>()[0]
.to_string()
== *filename
{
return Config::read_from_yaml_file(entry.path());
}
}
}
}
}
}
Err(ioError::new(
ErrorKind::NotFound,
format!("Cannot found '{}' file in load path", filename),
))
}
/// Return key's path
fn find_pubkey_by_name(&self, filename: &String) -> Result<String> {
if let Some(paths) = &self.keys_path {
for path in paths {
for entry in fs::read_dir(path)? {
if let Ok(entry) = entry {
if let Some(extension) = entry.path().extension() {
if extension == "pem" {
if entry
.file_name()
.to_str()
.unwrap()
.split('.')
.collect::<Vec<&str>>()[0]
.to_string()
== *filename
{
return Ok(entry
.path()
.into_os_string()
.into_string()
.unwrap());
}
}
}
}
}
}
}
Err(ioError::new(
ErrorKind::NotFound,
format!("Cannot found '{}' file in keys path", filename),
))
}
/// recursive check if config have dead loop prehook call
fn recursive_check(
&self,
start: &Config,
set: &mut HashSet<String>,
chain: &mut Vec<(String, String)>,
) -> bool {
if let Some(hook) = start.get_hook_detail(&String::from("prehook")) {
// if hashset already has this child in set, return wrong
if set.contains(&hook[1]) {
return false;
}
// Get prehook child's config
if let Ok(next_config) = self.find_config_by_name(&hook[1]) {
// insert in set
set.insert(hook[1].clone());
// push this one in call_chain
chain.push((hook[0].clone(), hook[1].clone()));
// keep checking
return self.recursive_check(&next_config, set, chain);
}
return false; // if hook child not exsit
}
true // test fine
}
/// Get config prehook details, find them one by one make sure no circle inside
fn pre_hook_check(
&self,
name: &String,
start: &Config,
) -> Result<(bool, Vec<(String, String)>)> {
let mut call_set = HashSet::new();
let mut call_chain = vec![]; // chain including (command, name)
// put this
call_set.insert(name.clone());
if self.recursive_check(start, &mut call_set, &mut call_chain) {
Ok((true, call_chain))
} else {
Ok((false, call_chain))
}
}
/// Generate call chain used by KG to handle prehooks
fn call_chain_combine(
&self,
call_chain: Vec<(String, String)>,
) -> Result<Vec<(String, String, Config)>> {
let all_child = self.all_ymls_in_load_path()?;
let mut result = vec![];
for (comm, name) in call_chain {
if let Some(conf_path) = all_child.iter().find(|x| x.0 == name) {
if let Ok(conf) = Config::read_from_yaml_file((&conf_path.1).into()) {
result.push((comm, name, conf));
}
}
}
Ok(result)
}
}
/// Start a child processing, and give child_handle
/// Side effection: config.child_id be updated
pub fn start_new_child(config: &mut Config) -> Result<Child> {
let (com, args) = config.split_args();
let mut command = Command::new(&com);
command.current_dir(config.location_path.clone());
match args {
Some(arg) => {
command.args(arg.split(' ').collect::<Vec<&str>>());
}
_ => (),
};
// setting stdout and stderr file path
match &config.stdout {
Some(out) => {
match out.mode {
OutputMode::Create => command.stdout(File::create(out.path.clone())?),
OutputMode::Append => command.stdout(
OpenOptions::new()
.append(true)
.create(true)
.open(out.path.clone())?,
),
};
()
}
None => (),
}
match &config.stderr {
Some(err) => {
match err.mode {
OutputMode::Create => command.stderr(File::create(err.path.clone())?),
OutputMode::Append => command.stderr(
OpenOptions::new()
.append(true)
.create(true)
.open(err.path.clone())?,
),
};
()
}
None => (),
}
//run command and give child handle
let child = command.spawn();
match child {
Ok(ref c) => {
config.child_id = Some(c.id());
config.start_time = Some(Local::now());
return child;
}
_ => {
return Err(ioError::new(
ErrorKind::Other,
format!("Cannot start command {:?}", command),
));
}
};
}
/// Check if child name is legal or not
fn child_name_legal_check(s: &str) -> core::result::Result<(), String> {
if s == "all" || s == "on" {
return Err(format!(
r#""{}" is reserved keywords, cannot run child named "{}""#,
s, s
));
} else if client::Ops::is_op(s) {
//check if child name is keyword or not.
return Err(format!(
"this child name {} is one of keyword, cannot be child name",
s
));
}
Ok(())
}
/// Receive server config and start a new server
/// New server including:
/// 1. a way receive command from client //move to start_deamon
/// 2. first start will start all children in config path
/// 3. then keep listening commands and can restart each of them //move to start deamon
pub fn start_new_server(config_path: &str) -> Result<Kindergarten> {
// Read server's config file
let server_conf = if config_path == "" {
ServerConfig::load("/tmp/server.yml")?
} else {
ServerConfig::load(config_path)?
};
// create new kindergarten
let mut kindergarten = Kindergarten::new();
// store server config location
// after this, server_config_path should never changed
kindergarten.server_config_path = config_path.to_string();
// kindergarden make encrypt on
if server_conf.encrypt_mode == "on" {
kindergarten.encrypt_mode = true;
}
// make startup children vec
let startup_children = match server_conf.mode.as_ref() {
"full" => server_conf.all_ymls_in_load_path()?,
"half" => server_conf.half_mode()?,
"quiet" | _ => vec![],
};
// print log
if startup_children.len() != 0 {
println!(
"{}",
logger::timelog(&format!(
"these children will start with server startup: {:?}",
startup_children
.iter()
.map(|x| x.1.clone())
.collect::<Vec<String>>()
))
);
}
// start children with server
for conf in startup_children {
// legal check child name
// because client already check when it makes command...
// ..., however, server un-quiet mode won't through client command check.
// so we need check again here.
if let Err(e) = child_name_legal_check(&conf.0) {
println!("{}", logger::timelog(&e));
continue;
};
let mut child_config = Config::read_from_yaml_file((&conf.1).into())?;
let child_handle = start_new_child(&mut child_config)?;
println!("{}", logger::timelog(&format!("start {} success", conf.0)));
// because repeat function need kindergarden be created.
if child_config.is_repeat() {
println!(
"{}",
logger::timelog(&format!(
"find child {} has repeat status, not support repeat in un-quiet mode during server startup",
&conf.0
))
)
};
// because repeat function need kindergarden be created.
if child_config.has_hook() {
println!(
"{}",
logger::timelog(&format!(
"find child {} has hook(s), not support prehook in un-quiet mode during server startup",
&conf.0
))
)
};
// registe id
let id = child_config.child_id.unwrap();
kindergarten.register_id(id, child_handle, child_config);
// regist name
kindergarten.register_name(&conf.0, id);
}
Ok(kindergarten)
}
/// start a listener for client commands
/// keep taking care children
pub fn start_deamon(safe_kg: Arc<Mutex<Kindergarten>>, sd: Sender<(String, String)>) -> Result<()> {
// re-read server config
let server_conf = if safe_kg.lock().unwrap().server_config_path == "" {
ServerConfig::load("/tmp/server.yml")?
} else {
ServerConfig::load(&safe_kg.lock().unwrap().server_config_path)?
};
// start TCP listener to receive client commands
let listener = TcpListener::bind((server_conf.listener_addr.clone(), 33889)).unwrap();
println!(
"{} {}:{}",
logger::timelog("Server is listening on"),
server_conf.listener_addr,
33889
);
for stream in listener.incoming() {
match stream {
Ok(stream) => {
let this_kg = Arc::clone(&safe_kg);
let sd_ = Sender::clone(&sd);
let _ = thread::spawn(move || {
//run handle_client and catch error if has
match handle_client(stream, this_kg) {
Err(e) => {
// hard check if it is suicide operation, because I only care this message so far.
// this operation isn't in handle_client because it has make sure return to client..
// ..first
let (first, second) = {
let s = e.to_string();
let (f, ss) = s.split_at(12);
(f.to_string(), ss.to_string())
};
if first == "I am dying. " {
println!("{}", logger::timelog(&second));
//tell main thread,
sd_.send((first.to_string(), second.to_string())).unwrap();
} else {
//if just normal error
println!("{}", logger::timelog(&e.to_string()));
}
}
Ok(des) => println!("{}", logger::timelog(&des)),
}
});
}
Err(e) => println!("{}", logger::timelog(&e.to_string())),
}
}
Ok(())
}
/// get client TCP stream and send to channel
fn handle_client(mut stream: TcpStream, kig: Arc<Mutex<Kindergarten>>) -> Result<String> {
let mut buf = [0; 100 + 4096]; // 100 command length + 4096 key length buffer
stream.read(&mut buf)?;
let buf_vec = {
let mut temp = buf.to_vec();
temp.reverse();
while temp[0] == 0 {
temp.drain(..1);
}
temp.reverse();
temp
};
// here to check if this command with
let received_comm = if kig.lock().unwrap().encrypt_mode {
// tell client this server running in encrypt mode
stream.write_all("Running on encrypt mode, need to dencrypt your command.\n".as_bytes())?;
// re-read server config
let server_conf = if kig.lock().unwrap().server_config_path == "" {
ServerConfig::load("/tmp/server.yml")?
} else {
ServerConfig::load(&kig.lock().unwrap().server_config_path)?
};
// parse keyname and encrypted data
let (keyname, data) = match DataWrapper::unwrap_from(&buf_vec) {
Ok((n, d)) => (n, d),
Err(e) => {
stream.write_all(e.to_string().as_bytes())?;
return Err(e);
}
};
let key = {
let k_path = match server_conf.find_pubkey_by_name(&keyname) {
Ok(kk) => kk,
Err(e) => {
stream.write_all(e.to_string().as_bytes())?;
return Err(e);
}
};
let mut content = String::new();
let _ = File::open(k_path)?.read_to_string(&mut content);
Rsa::public_key_from_pem(&content.as_bytes())?
};
let dw = match DataWrapper::decrypt_with_pubkey(data, keyname, key) {
Ok(d) => d,
Err(e) => {
stream.write_all(e.to_string().as_bytes())?;
return Err(e);
}
};
dw.data
} else {
match String::from_utf8(buf_vec) {
Ok(s) => s,
Err(e) => return Err(ioError::new(ErrorKind::InvalidInput, e)),
}
};
match day_care(kig, received_comm) {
Ok(resp) => {
stream.write_all(resp.as_bytes())?;
Ok(resp)
}
Err(e) => {
stream.write_all(e.to_string().as_bytes())?;
Err(e)
}
}
}
/// day care is major function of server handle commands
pub fn day_care(kig: Arc<Mutex<Kindergarten>>, data: String) -> Result<String> {
let mut kg = kig.lock().unwrap();
// run check around here, clean all stopped children
// check operation has its own check_around too,
// check_around here for other operations.
kg.check_around()?;
let command = client::Command::new_from_str(data.as_str().split(' ').collect::<Vec<&str>>())?;
let server_conf = if kg.server_config_path == "" {
ServerConfig::load("/tmp/server.yml")?
} else {
ServerConfig::load(&kg.server_config_path)?
};
match command.get_ops() {
client::Ops::Restart => {
let name = command.child_name.as_ref().unwrap();
// check name
if let Err(e) = child_name_legal_check(name) {
return Err(ioError::new(ErrorKind::InvalidInput, e));
}
let mut conf = server_conf.find_config_by_name(name)?;
// check prehook here
let pre_hook_result = server_conf.pre_hook_check(name, &conf)?;
if !pre_hook_result.0 {
return Err(ioError::new(
ErrorKind::Other,
format!(
"This child, {}, cannot pass pre-check",
command.child_name.unwrap()
),
));
} else {
let mut pre_hook_combine = server_conf.call_chain_combine(pre_hook_result.1)?;
// reverse call chain
pre_hook_combine.reverse();
kg.handle_pre_hook(pre_hook_combine)?;
}
match kg.restart(name, &mut conf) {
Ok(_) => {
// repeat here
let repeat_meg = if conf.is_repeat() {
repeat(conf, Arc::clone(&kig), name.clone())
} else {
String::new()
};
Ok(format!(
"restart {} success{}",
command.child_name.as_ref().unwrap(),
repeat_meg,
))
}
Err(e) => Err(e),
}
}
// hot start a new child after its config yaml file put in loadpath
client::Ops::Start => {
let name = command.child_name.as_ref().unwrap();
if let Err(e) = child_name_legal_check(name) {
return Err(ioError::new(ErrorKind::InvalidInput, e));
}
if let Some(_) = kg.has_child(name) {
return Err(ioError::new(
ErrorKind::Other,
format!(
"Cannot start this child {}, it already exsits",
command.child_name.unwrap()
),
));
}
// read this child's config
let mut conf = server_conf.find_config_by_name(&name)?;
// check prehook here
let pre_hook_result = server_conf.pre_hook_check(name, &conf)?;
let mut pre_hook_msg = String::new();
if !pre_hook_result.0 {
return Err(ioError::new(
ErrorKind::Other,
format!(
"This child, {}, cannot pass recursive check",
command.child_name.unwrap()
),
));
} else {
let mut pre_hook_combine = server_conf.call_chain_combine(pre_hook_result.1)?;
// reverse call chain
if pre_hook_combine.len() != 0 {
pre_hook_combine.reverse();
kg.handle_pre_hook(pre_hook_combine)?;
pre_hook_msg.push_str("Find pre-hook, has started pre-hook firstly. ");
}
}
match kg.start(name, &mut conf) {
Ok(_) => {
// repeat here
let repeat_meg = if conf.is_repeat() {
repeat(conf, Arc::clone(&kig), name.clone())
} else {
String::new()
};
Ok(format!(
"{}start {} success{}",
pre_hook_msg,
name.clone(),
repeat_meg
))
}
Err(e) => Err(e),
}
}
client::Ops::Stop => {
let post_hook =
if let Some(conf) = kg.get_child_config(command.child_name.as_ref().unwrap()) {
conf.get_hook(&String::from("posthook"))
} else {
None
};
match kg.stop(command.child_name.as_ref().unwrap()) {
Ok(_) => {
if let Some(post_hook_command) = post_hook {
// connect to supervisor itself
let mut stream = TcpStream::connect((
match server_conf.listener_addr.as_str() {
// listen "::" means connect to ::1
"::" => "::1".to_string(),
// listen "0.0.0.0" means connect to 127.0.0.1
"0.0.0.0" => "127.0.0.1".to_string(),
// other address
x => x.to_string(),
},
33889,
))?;
stream.write_all(post_hook_command.as_bytes())?;
stream.flush()?;
}
return Ok(format!(
"stop {} success",
command.child_name.as_ref().unwrap()
));
}
Err(e) => Err(e),
}
}
// try start will force start child:
// if it is running, call restart.
// if it has stopped for some reason, start it
client::Ops::TryStart => {
let mut resp = String::new();
let name = command.child_name.as_ref().unwrap();
if let Err(e) = child_name_legal_check(name) {
return Err(ioError::new(ErrorKind::InvalidInput, e));
};
//check if it is running, stop it or not.
if let Some(_) = kg.has_child(name) {
resp.push_str("This child already start, stop it first. ");
let post_hook =
if let Some(conf) = kg.get_child_config(command.child_name.as_ref().unwrap()) {
conf.get_hook(&String::from("posthook"))
} else {
None
};
match kg.stop(name) {
Ok(_) => {
if let Some(post_hook_command) = post_hook {
// connect to supervisor itself
let mut stream = TcpStream::connect((
match server_conf.listener_addr.as_str() {
// listen "::" means connect to ::1
"::" => "::1".to_string(),
// listen "0.0.0.0" means connect to 127.0.0.1
"0.0.0.0" => "127.0.0.1".to_string(),
// other address
x => x.to_string(),
},
33889,
))?;
stream.write_all(post_hook_command.as_bytes())?;
stream.flush()?;
resp.push_str(&format!(
"find post-hook \"{}\", run it after stop. ",
post_hook_command
));
}
resp.push_str(&format!(
"Stop {} success, start it again. ",
command.child_name.as_ref().unwrap()
));
}
Err(e) => {
return Err(ioError::new(
ErrorKind::InvalidData,
format!("stop failed, error: {}", &e.to_string()),
));
}
}
}
let mut conf = server_conf.find_config_by_name(name)?;
//check prehook here
let pre_hook_result = server_conf.pre_hook_check(name, &conf)?;
if !pre_hook_result.0 {
return Err(ioError::new(
ErrorKind::Other,
format!(
"This child, {}, cannot pass pre-check",
command.child_name.unwrap()
),
));
} else {
let mut pre_hook_combine = server_conf.call_chain_combine(pre_hook_result.1)?;
//reverse call chain
pre_hook_combine.reverse();
kg.handle_pre_hook(pre_hook_combine)?;
}
match kg.start(name, &mut conf) {
Ok(_) => {
//repeat here
let repeat_meg = if conf.is_repeat() {
repeat(conf, Arc::clone(&kig), name.clone())
} else {
String::new()
};
resp.push_str(&format!(
"Start {} success{} ",
command.child_name.as_ref().unwrap(),
repeat_meg,
));
Ok(resp)
}
Err(e) => Err(e),
}
}
// kill supervisor itself
client::Ops::Kill => {
let mut last_will = String::new();
// step1: stop all
if let Err(e) = kg.stop(&"all".to_string()) {
last_will.push_str(&format!("there is error when stop all {}", e));
}
// step2: return special err outside, let deamon know and stop
Err(ioError::new(
ErrorKind::Other,
format!("I am dying. last error: \n{}", last_will),
))
}
client::Ops::Check => {
kg.check_status(command.child_name.as_ref().unwrap_or(&String::new()))
}
client::Ops::Info => server_info(server_conf, &kg, command.child_name.as_ref()),
_ => {
return Err(ioError::new(
ErrorKind::InvalidInput,
logger::timelog("not support"),
))
}
}
}
/// receive child config, KG, and filename of child config, repeat function
fn repeat(conf: Config, kig: Arc<Mutex<Kindergarten>>, name: String) -> String {
// clone locked val to timer
let timer_lock_val = Arc::clone(&kig);
let next_time = conf.to_duration().unwrap();
let comm = conf.repeat_command().unwrap().clone();
// give a timer
thread::spawn(move || {
Timer::new_from_conf(name, conf)
.unwrap()
.run(timer_lock_val)
});
format!(", and it will {} in {:?}", comm, next_time)
}
/// Server apply info of itself to client
fn server_info(config: ServerConfig, kg: &Kindergarten, name: Option<&String>) -> Result<String> {
let name = name.map_or("all", |n| n.as_str());
let mut resp = String::from("==Server Info Below==\n");
match name {
"all" => {
// server config path
resp.push_str("Server config path:\n");
resp.push_str(&kg.server_config_path);
resp.push_str("\n");
// children name are running
resp.push_str("Children are running (use 'check' command to see child detail):\n");
let mut s = String::from("[");
kg.all_running_children().iter().for_each(|name| {
s.push_str(name);
s.push_str(" ");
});
resp.push_str(&s);
resp.push_str("]");
resp.push_str("\n");
// server configs
// load paths
resp.push_str("Server configs:\n");
resp.push_str(&format!("Load paths: {:?}\n", config.load_paths));
resp.push_str(&format!("Encrypt mode: {:?}\n", config.encrypt_mode));
}
_ => {}
}
resp.push_str("=======================\n");
Ok(resp)
}