mirror of
https://github.com/LizardByte/Sunshine.git
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355 lines
8.5 KiB
C++
355 lines
8.5 KiB
C++
//
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// Created by loki on 12/14/19.
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//
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#define BOOST_BIND_GLOBAL_PLACEHOLDERS
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#include "process.h"
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#include <string>
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#include <vector>
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#include <boost/property_tree/json_parser.hpp>
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#include <boost/property_tree/ptree.hpp>
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#include <boost/filesystem.hpp>
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#include "main.h"
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#include "utility.h"
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namespace proc {
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using namespace std::literals;
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namespace bp = boost::process;
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namespace pt = boost::property_tree;
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proc_t proc;
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void process_end(bp::child &proc, bp::group &proc_handle) {
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if(!proc.running()) {
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return;
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}
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BOOST_LOG(debug) << "Force termination Child-Process"sv;
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proc_handle.terminate();
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// avoid zombie process
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proc.wait();
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}
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int exe(const std::string &cmd, bp::environment &env, file_t &file, std::error_code &ec) {
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if(!file) {
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return bp::system(cmd, env, bp::std_out > bp::null, bp::std_err > bp::null, ec);
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}
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return bp::system(cmd, env, bp::std_out > file.get(), bp::std_err > file.get(), ec);
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}
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int proc_t::execute(int app_id) {
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if(!running() && _app_id != -1) {
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// previous process exited on it's own, reset _process_handle
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_process_handle = bp::group();
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_app_id = -1;
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}
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if(app_id < 0 || app_id >= _apps.size()) {
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BOOST_LOG(error) << "Couldn't find app with ID ["sv << app_id << ']';
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return 404;
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}
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// Ensure starting from a clean slate
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terminate();
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_app_id = app_id;
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auto &proc = _apps[app_id];
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_undo_begin = std::begin(proc.prep_cmds);
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_undo_it = _undo_begin;
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if(!proc.output.empty() && proc.output != "null"sv) {
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_pipe.reset(fopen(proc.output.c_str(), "a"));
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}
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std::error_code ec;
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//Executed when returning from function
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auto fg = util::fail_guard([&]() {
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terminate();
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});
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for(; _undo_it != std::end(proc.prep_cmds); ++_undo_it) {
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auto &cmd = _undo_it->do_cmd;
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BOOST_LOG(info) << "Executing: ["sv << cmd << ']';
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auto ret = exe(cmd, _env, _pipe, ec);
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if(ec) {
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BOOST_LOG(error) << "Couldn't run ["sv << cmd << "]: System: "sv << ec.message();
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return -1;
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}
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if(ret != 0) {
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BOOST_LOG(error) << '[' << cmd << "] failed with code ["sv << ret << ']';
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return -1;
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}
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}
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for(auto &cmd : proc.detached) {
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BOOST_LOG(info) << "Spawning ["sv << cmd << ']';
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if(proc.output.empty() || proc.output == "null"sv) {
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bp::spawn(cmd, _env, bp::std_out > bp::null, bp::std_err > bp::null, ec);
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}
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else {
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bp::spawn(cmd, _env, bp::std_out > _pipe.get(), bp::std_err > _pipe.get(), ec);
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}
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if(ec) {
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BOOST_LOG(warning) << "Couldn't spawn ["sv << cmd << "]: System: "sv << ec.message();
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}
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}
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if(proc.cmd.empty()) {
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BOOST_LOG(debug) << "Executing [Desktop]"sv;
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placebo = true;
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} else {
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boost::filesystem::path working_dir = proc.working_dir.empty() ?
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boost::filesystem::path(proc.cmd).parent_path() : boost::filesystem::path(proc.working_dir);
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if(proc.output.empty() || proc.output == "null"sv) {
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BOOST_LOG(info) << "Executing: ["sv << proc.cmd << ']';
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_process = bp::child(_process_handle, proc.cmd, _env, bp::start_dir(working_dir), bp::std_out > bp::null, bp::std_err > bp::null, ec);
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}
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else {
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BOOST_LOG(info) << "Executing: ["sv << proc.cmd << ']';
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_process = bp::child(_process_handle, proc.cmd, _env, bp::start_dir(working_dir), bp::std_out > _pipe.get(), bp::std_err > _pipe.get(), ec);
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}
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}
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if(ec) {
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BOOST_LOG(warning) << "Couldn't run ["sv << proc.cmd << "]: System: "sv << ec.message();
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return -1;
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}
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fg.disable();
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return 0;
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}
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int proc_t::running() {
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if(placebo || _process.running()) {
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return _app_id;
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}
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return -1;
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}
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void proc_t::terminate() {
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std::error_code ec;
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// Ensure child process is terminated
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placebo = false;
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process_end(_process, _process_handle);
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_app_id = -1;
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if(ec) {
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BOOST_LOG(fatal) << "System: "sv << ec.message();
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log_flush();
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std::abort();
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}
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for(; _undo_it != _undo_begin; --_undo_it) {
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auto &cmd = (_undo_it - 1)->undo_cmd;
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if(cmd.empty()) {
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continue;
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}
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BOOST_LOG(debug) << "Executing: ["sv << cmd << ']';
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auto ret = exe(cmd, _env, _pipe, ec);
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if(ec) {
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BOOST_LOG(fatal) << "System: "sv << ec.message();
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log_flush();
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std::abort();
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}
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if(ret != 0) {
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BOOST_LOG(fatal) << "Return code ["sv << ret << ']';
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log_flush();
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std::abort();
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}
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}
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_pipe.reset();
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}
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const std::vector<ctx_t> &proc_t::get_apps() const {
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return _apps;
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}
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std::vector<ctx_t> &proc_t::get_apps() {
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return _apps;
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}
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proc_t::~proc_t() {
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terminate();
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}
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std::string_view::iterator find_match(std::string_view::iterator begin, std::string_view::iterator end) {
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int stack = 0;
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--begin;
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do {
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++begin;
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switch(*begin) {
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case '(':
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++stack;
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break;
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case ')':
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--stack;
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}
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} while(begin != end && stack != 0);
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if(begin == end) {
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throw std::out_of_range("Missing closing bracket \')\'");
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}
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return begin;
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}
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std::string parse_env_val(bp::native_environment &env, const std::string_view &val_raw) {
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auto pos = std::begin(val_raw);
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auto dollar = std::find(pos, std::end(val_raw), '$');
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std::stringstream ss;
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while(dollar != std::end(val_raw)) {
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auto next = dollar + 1;
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if(next != std::end(val_raw)) {
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switch(*next) {
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case '(': {
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ss.write(pos, (dollar - pos));
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auto var_begin = next + 1;
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auto var_end = find_match(next, std::end(val_raw));
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ss << env[std::string { var_begin, var_end }].to_string();
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pos = var_end + 1;
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next = var_end;
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break;
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}
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case '$':
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ss.write(pos, (next - pos));
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pos = next + 1;
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++next;
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break;
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}
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dollar = std::find(next, std::end(val_raw), '$');
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}
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else {
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dollar = next;
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}
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}
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ss.write(pos, (dollar - pos));
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return ss.str();
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}
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std::optional<proc::proc_t> parse(const std::string &file_name) {
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pt::ptree tree;
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try {
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pt::read_json(file_name, tree);
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auto &apps_node = tree.get_child("apps"s);
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auto &env_vars = tree.get_child("env"s);
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auto this_env = boost::this_process::environment();
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for(auto &[name, val] : env_vars) {
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this_env[name] = parse_env_val(this_env, val.get_value<std::string>());
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}
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std::vector<proc::ctx_t> apps;
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for(auto &[_, app_node] : apps_node) {
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proc::ctx_t ctx;
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auto prep_nodes_opt = app_node.get_child_optional("prep-cmd"s);
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auto detached_nodes_opt = app_node.get_child_optional("detached"s);
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auto output = app_node.get_optional<std::string>("output"s);
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auto name = parse_env_val(this_env, app_node.get<std::string>("name"s));
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auto cmd = app_node.get_optional<std::string>("cmd"s);
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auto working_dir = app_node.get_optional<std::string>("working-dir"s);
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std::vector<proc::cmd_t> prep_cmds;
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if(prep_nodes_opt) {
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auto &prep_nodes = *prep_nodes_opt;
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prep_cmds.reserve(prep_nodes.size());
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for(auto &[_, prep_node] : prep_nodes) {
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auto do_cmd = parse_env_val(this_env, prep_node.get<std::string>("do"s));
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auto undo_cmd = prep_node.get_optional<std::string>("undo"s);
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if(undo_cmd) {
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prep_cmds.emplace_back(std::move(do_cmd), parse_env_val(this_env, *undo_cmd));
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}
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else {
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prep_cmds.emplace_back(std::move(do_cmd));
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}
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}
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}
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std::vector<std::string> detached;
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if(detached_nodes_opt) {
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auto &detached_nodes = *detached_nodes_opt;
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detached.reserve(detached_nodes.size());
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for(auto &[_, detached_val] : detached_nodes) {
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detached.emplace_back(parse_env_val(this_env, detached_val.get_value<std::string>()));
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}
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}
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if(output) {
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ctx.output = parse_env_val(this_env, *output);
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}
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if(cmd) {
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ctx.cmd = parse_env_val(this_env, *cmd);
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}
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if(working_dir) {
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ctx.working_dir = parse_env_val(this_env, *working_dir);
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}
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ctx.name = std::move(name);
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ctx.prep_cmds = std::move(prep_cmds);
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ctx.detached = std::move(detached);
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apps.emplace_back(std::move(ctx));
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}
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return proc::proc_t {
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std::move(this_env), std::move(apps)
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};
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}
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catch(std::exception &e) {
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BOOST_LOG(error) << e.what();
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}
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return std::nullopt;
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}
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void refresh(const std::string &file_name) {
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auto proc_opt = proc::parse(file_name);
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if(proc_opt) {
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{
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proc::ctx_t ctx;
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ctx.name = "Desktop"s;
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proc_opt->get_apps().emplace(std::begin(proc_opt->get_apps()), std::move(ctx));
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}
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proc = std::move(*proc_opt);
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}
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}
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} // namespace proc
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