openethereum/parity/main.rs

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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Ethcore client application.
#![warn(missing_docs)]
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extern crate ctrlc;
extern crate dir;
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extern crate fdlimit;
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#[macro_use]
extern crate log;
extern crate panic_hook;
extern crate parity;
extern crate parking_lot;
#[cfg(windows)] extern crate winapi;
use std::ffi::OsString;
use std::fs::{remove_file, metadata, File, create_dir_all};
use std::io::{self as stdio, Read, Write};
use std::path::PathBuf;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::{process, env};
use ctrlc::CtrlC;
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use dir::default_hypervisor_path;
use fdlimit::raise_fd_limit;
use parity::{start, ExecutionAction};
use parking_lot::{Condvar, Mutex};
const PLEASE_RESTART_EXIT_CODE: i32 = 69;
const PARITY_EXECUTABLE_NAME: &str = "parity";
#[derive(Debug)]
enum Error {
BinaryNotFound,
ExitCode(i32),
Restart,
Unknown
}
fn update_path(name: &str) -> PathBuf {
let mut dest = default_hypervisor_path();
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dest.push(name);
dest
}
fn latest_exe_path() -> Result<PathBuf, Error> {
File::open(update_path("latest")).and_then(|mut f| {
let mut exe_path = String::new();
trace!(target: "updater", "latest binary path: {:?}", f);
f.read_to_string(&mut exe_path).map(|_| update_path(&exe_path))
})
.or(Err(Error::BinaryNotFound))
}
fn latest_binary_is_newer(current_binary: &Option<PathBuf>, latest_binary: &Option<PathBuf>) -> bool {
match (
current_binary
.as_ref()
.and_then(|p| metadata(p.as_path()).ok())
.and_then(|m| m.modified().ok()),
latest_binary
.as_ref()
.and_then(|p| metadata(p.as_path()).ok())
.and_then(|m| m.modified().ok())
) {
(Some(latest_exe_time), Some(this_exe_time)) if latest_exe_time > this_exe_time => true,
_ => false,
}
}
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fn set_spec_name_override(spec_name: &str) {
if let Err(e) = create_dir_all(default_hypervisor_path())
.and_then(|_| File::create(update_path("spec_name_override"))
.and_then(|mut f| f.write_all(spec_name.as_bytes())))
{
warn!("Couldn't override chain spec: {} at {:?}", e, update_path("spec_name_override"));
}
}
fn take_spec_name_override() -> Option<String> {
let p = update_path("spec_name_override");
let r = File::open(p.clone())
.ok()
.and_then(|mut f| {
let mut spec_name = String::new();
f.read_to_string(&mut spec_name).ok().map(|_| spec_name)
});
let _ = remove_file(p);
r
}
#[cfg(windows)]
fn global_cleanup() {
// We need to cleanup all sockets before spawning another Parity process. This makes sure everything is cleaned up.
// The loop is required because of internal reference counter for winsock dll. We don't know how many crates we use do
// initialize it. There's at least 2 now.
for _ in 0.. 10 {
unsafe { ::winapi::um::winsock2::WSACleanup(); }
}
}
#[cfg(not(windows))]
fn global_init() {}
#[cfg(windows)]
fn global_init() {
// When restarting in the same process this reinits windows sockets.
unsafe {
const WS_VERSION: u16 = 0x202;
let mut wsdata: ::winapi::um::winsock2::WSADATA = ::std::mem::zeroed();
::winapi::um::winsock2::WSAStartup(WS_VERSION, &mut wsdata);
}
}
#[cfg(not(windows))]
fn global_cleanup() {}
// Starts parity binary installed via `parity-updater` and returns the code it exits with.
fn run_parity() -> Result<(), Error> {
global_init();
let prefix = vec![OsString::from("--can-restart"), OsString::from("--force-direct")];
let res: Result<(), Error> = latest_exe_path()
.and_then(|exe| process::Command::new(exe)
.args(&(env::args_os().skip(1).chain(prefix.into_iter()).collect::<Vec<_>>()))
.status()
.ok()
.map_or(Err(Error::Unknown), |es| {
match es.code() {
// Process success
Some(0) => Ok(()),
// Please restart
Some(PLEASE_RESTART_EXIT_CODE) => Err(Error::Restart),
// Process error code `c`
Some(c) => Err(Error::ExitCode(c)),
// Unknown error, couldn't determine error code
_ => Err(Error::Unknown),
}
})
);
global_cleanup();
res
}
#[derive(Debug)]
/// Status used to exit or restart the program.
struct ExitStatus {
/// Whether the program panicked.
panicking: bool,
/// Whether the program should exit.
should_exit: bool,
/// Whether the program should restart.
should_restart: bool,
/// If a restart happens, whether a new chain spec should be used.
spec_name_override: Option<String>,
}
// Run `locally installed version` of parity (i.e, not installed via `parity-updater`)
// Returns the exit error code.
fn main_direct(force_can_restart: bool) -> i32 {
global_init();
let mut conf = {
let args = std::env::args().collect::<Vec<_>>();
parity::Configuration::parse_cli(&args).unwrap_or_else(|e| e.exit())
};
if let Some(spec_override) = take_spec_name_override() {
conf.args.flag_testnet = false;
conf.args.arg_chain = spec_override;
}
let can_restart = force_can_restart || conf.args.flag_can_restart;
// increase max number of open files
raise_fd_limit();
let exit = Arc::new((Mutex::new(ExitStatus {
panicking: false,
should_exit: false,
should_restart: false,
spec_name_override: None
}), Condvar::new()));
// Double panic can happen. So when we lock `ExitStatus` after the main thread is notified, it cannot be locked
// again.
let exiting = Arc::new(AtomicBool::new(false));
let exec = if can_restart {
start(
conf,
{
let e = exit.clone();
let exiting = exiting.clone();
move |new_chain: String| {
if !exiting.swap(true, Ordering::SeqCst) {
*e.0.lock() = ExitStatus {
panicking: false,
should_exit: true,
should_restart: true,
spec_name_override: Some(new_chain),
};
e.1.notify_all();
}
}
},
{
let e = exit.clone();
let exiting = exiting.clone();
move || {
if !exiting.swap(true, Ordering::SeqCst) {
*e.0.lock() = ExitStatus {
panicking: false,
should_exit: true,
should_restart: true,
spec_name_override: None,
};
e.1.notify_all();
}
}
}
)
} else {
trace!(target: "mode", "Not hypervised: not setting exit handlers.");
start(conf, move |_| {}, move || {})
};
let res = match exec {
Ok(result) => match result {
ExecutionAction::Instant(Some(s)) => { println!("{}", s); 0 },
ExecutionAction::Instant(None) => 0,
ExecutionAction::Running(client) => {
panic_hook::set_with({
let e = exit.clone();
let exiting = exiting.clone();
move || {
if !exiting.swap(true, Ordering::SeqCst) {
*e.0.lock() = ExitStatus {
panicking: true,
should_exit: true,
should_restart: false,
spec_name_override: None,
};
e.1.notify_all();
}
}
});
CtrlC::set_handler({
let e = exit.clone();
let exiting = exiting.clone();
move || {
if !exiting.swap(true, Ordering::SeqCst) {
*e.0.lock() = ExitStatus {
panicking: false,
should_exit: true,
should_restart: false,
spec_name_override: None,
};
e.1.notify_all();
}
}
});
// Wait for signal
let mut lock = exit.0.lock();
if !lock.should_exit {
let _ = exit.1.wait(&mut lock);
}
client.shutdown();
if lock.should_restart {
if let Some(ref spec_name) = lock.spec_name_override {
set_spec_name_override(&spec_name.clone());
}
PLEASE_RESTART_EXIT_CODE
} else {
if lock.panicking {
1
} else {
0
}
}
},
},
Err(err) => {
writeln!(&mut stdio::stderr(), "{}", err).expect("StdErr available; qed");
1
},
};
global_cleanup();
res
}
fn println_trace_main(s: String) {
if env::var("RUST_LOG").ok().and_then(|s| s.find("main=trace")).is_some() {
println!("{}", s);
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}
}
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#[macro_export]
macro_rules! trace_main {
($arg:expr) => (println_trace_main($arg.into()));
($($arg:tt)*) => (println_trace_main(format!("{}", format_args!($($arg)*))));
}
fn main() {
panic_hook::set_abort();
// the user has specified to run its originally installed binary (not via `parity-updater`)
let force_direct = std::env::args().any(|arg| arg == "--force-direct");
// absolute path to the current `binary`
let exe_path = std::env::current_exe().ok();
// the binary is named `target/xx/yy`
let development = exe_path
.as_ref()
.and_then(|p| {
p.parent()
.and_then(|p| p.parent())
.and_then(|p| p.file_name())
.map(|n| n == "target")
})
.unwrap_or(false);
// the binary is named `parity`
let same_name = exe_path
.as_ref()
.map_or(false, |p| {
p.file_stem().map_or(false, |n| n == PARITY_EXECUTABLE_NAME)
});
trace_main!("Starting up {} (force-direct: {}, development: {}, same-name: {})",
std::env::current_exe().ok().map_or_else(|| "<unknown>".into(), |x| format!("{}", x.display())),
force_direct,
development,
same_name);
if !force_direct && !development && same_name {
// Try to run the latest installed version of `parity`,
// Upon failure it falls back to the locally installed version of `parity`
// Everything run inside a loop, so we'll be able to restart from the child into a new version seamlessly.
loop {
// `Path` to the latest downloaded binary
let latest_exe = latest_exe_path().ok();
// `Latest´ binary exist
let have_update = latest_exe.as_ref().map_or(false, |p| p.exists());
// Canonicalized path to the current binary is not the same as to latest binary
let canonicalized_path_not_same = exe_path
.as_ref()
.map_or(false, |exe| latest_exe.as_ref()
.map_or(false, |lexe| exe.canonicalize().ok() != lexe.canonicalize().ok()));
// Downloaded `binary` is newer
let update_is_newer = latest_binary_is_newer(&latest_exe, &exe_path);
trace_main!("Starting... (have-update: {}, non-updated-current: {}, update-is-newer: {})", have_update, canonicalized_path_not_same, update_is_newer);
let exit_code = if have_update && canonicalized_path_not_same && update_is_newer {
trace_main!("Attempting to run latest update ({})...",
latest_exe.as_ref().expect("guarded by have_update; latest_exe must exist for have_update; qed").display());
match run_parity() {
Ok(_) => 0,
// Restart parity
Err(Error::Restart) => PLEASE_RESTART_EXIT_CODE,
// Fall back to local version
Err(e) => {
error!(target: "updater", "Updated binary could not be executed error: {:?}. Falling back to local version", e);
main_direct(true)
}
}
} else {
trace_main!("No latest update. Attempting to direct...");
main_direct(true)
};
trace_main!("Latest binary exited with exit code: {}", exit_code);
if exit_code != PLEASE_RESTART_EXIT_CODE {
trace_main!("Quitting...");
process::exit(exit_code);
}
trace!(target: "updater", "Re-running updater loop");
}
} else {
trace_main!("Running direct");
// Otherwise, we're presumably running the version we want. Just run and fall-through.
process::exit(main_direct(false));
}
}