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131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
// Copyright 2019 Roman Perepelitsa.
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//
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// This file is part of GitStatus.
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//
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// GitStatus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GitStatus is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
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#include "request.h"
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/select.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include <cstdlib>
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#include <iostream>
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#include "check.h"
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#include "logging.h"
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#include "print.h"
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#include "serialization.h"
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namespace gitstatus {
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namespace {
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Request ParseRequest(const std::string& s) {
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Request res;
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auto begin = s.begin(), end = s.end(), sep = std::find(begin, end, kFieldSep);
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VERIFY(sep != end) << "Malformed request: " << s;
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res.id.assign(begin, sep);
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begin = sep + 1;
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if (*begin == ':') {
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res.from_dotgit = true;
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++begin;
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}
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sep = std::find(begin, end, kFieldSep);
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res.dir.assign(begin, sep);
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if (sep == end) return res;
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begin = sep + 1;
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VERIFY(begin + 1 == end && (*begin == '0' || *begin == '1')) << "Malformed request: " << s;
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res.diff = *begin == '0';
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return res;
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}
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bool IsLockedFd(int fd) {
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CHECK(fd >= 0);
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struct flock flock = {};
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flock.l_type = F_RDLCK;
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flock.l_whence = SEEK_SET;
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CHECK(fcntl(fd, F_GETLK, &flock) != -1) << Errno();
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return flock.l_type != F_UNLCK;
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}
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} // namespace
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std::ostream& operator<<(std::ostream& strm, const Request& req) {
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strm << Print(req.id) << " for " << Print(req.dir);
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if (req.from_dotgit) strm << " [from-dotgit]";
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if (!req.diff) strm << " [no-diff]";
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return strm;
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}
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RequestReader::RequestReader(int fd, int lock_fd, int parent_pid)
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: fd_(fd), lock_fd_(lock_fd), parent_pid_(parent_pid) {
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CHECK(fd != lock_fd);
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}
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bool RequestReader::ReadRequest(Request& req) {
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auto eol = std::find(read_.begin(), read_.end(), kMsgSep);
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if (eol != read_.end()) {
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std::string msg(read_.begin(), eol);
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read_.erase(read_.begin(), eol + 1);
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req = ParseRequest(msg);
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return true;
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}
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char buf[256];
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while (true) {
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(fd_, &fds);
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struct timeval timeout = {.tv_sec = 1};
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int n;
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CHECK((n = select(fd_ + 1, &fds, NULL, NULL, &timeout)) >= 0) << Errno();
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if (n == 0) {
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if (lock_fd_ >= 0 && !IsLockedFd(lock_fd_)) {
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LOG(INFO) << "Lock on fd " << lock_fd_ << " is gone. Exiting.";
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std::exit(0);
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}
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if (parent_pid_ >= 0 && kill(parent_pid_, 0)) {
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LOG(INFO) << "Unable to send signal 0 to " << parent_pid_ << ". Exiting.";
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std::exit(0);
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}
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req = {};
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return false;
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}
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CHECK((n = read(fd_, buf, sizeof(buf))) >= 0) << Errno();
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if (n == 0) {
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LOG(INFO) << "EOF. Exiting.";
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std::exit(0);
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}
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read_.insert(read_.end(), buf, buf + n);
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int eol = std::find(buf, buf + n, kMsgSep) - buf;
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if (eol != n) {
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std::string msg(read_.begin(), read_.end() - (n - eol));
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read_.erase(read_.begin(), read_.begin() + msg.size() + 1);
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req = ParseRequest(msg);
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return true;
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}
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}
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}
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} // namespace gitstatus
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