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wmbusmeters/src/serial.cc

899 wiersze
24 KiB
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Czysty Wina Historia

/*
Copyright (C) 2017-2019 Fredrik Öhrström
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include"util.h"
#include"serial.h"
#include"shell.h"
#include <algorithm>
#include <fcntl.h>
#include <functional>
#include <memory.h>
#include <pthread.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
static int openSerialTTY(const char *tty, int baud_rate);
struct SerialDeviceImp;
struct SerialDeviceTTY;
struct SerialDeviceCommand;
struct SerialDeviceFile;
struct SerialDeviceSimulator;
struct SerialCommunicationManagerImp : public SerialCommunicationManager
{
SerialCommunicationManagerImp(time_t exit_after_seconds, time_t reopen_after_seconds, bool start_event_loop);
~SerialCommunicationManagerImp();
unique_ptr<SerialDevice> createSerialDeviceTTY(string dev, int baud_rate);
unique_ptr<SerialDevice> createSerialDeviceCommand(string command, vector<string> args, vector<string> envs,
function<void()> on_exit);
unique_ptr<SerialDevice> createSerialDeviceFile(string file);
unique_ptr<SerialDevice> createSerialDeviceSimulator();
void listenTo(SerialDevice *sd, function<void()> cb);
void stop();
void startEventLoop();
void waitForStop();
bool isRunning();
void setReopenAfter(int seconds);
void opened(SerialDeviceImp *sd);
void closed(SerialDeviceImp *sd);
void closeAll();
time_t reopenAfter() { return reopen_after_seconds_; }
private:
void *eventLoop();
static void *startLoop(void *);
bool running_ {};
bool expect_devices_to_work_ {}; // false during detection phase, true when running.
pthread_t main_thread_ {};
pthread_t thread_ {};
int max_fd_ {};
time_t start_time_ {};
time_t exit_after_seconds_ {};
time_t reopen_after_seconds_ {};
pthread_mutex_t event_loop_lock_ = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t devices_lock_ = PTHREAD_MUTEX_INITIALIZER;
vector<SerialDeviceImp*> devices_;
};
SerialCommunicationManagerImp::~SerialCommunicationManagerImp()
{
// Close all managed devices (not yet closed)
closeAll();
// Stop the event loop.
stop();
// Grab the event_loop_lock. This can only be done when the eventLoop has stopped running.
pthread_mutex_lock(&event_loop_lock_);
// Now we can be sure the eventLoop has stopped and it is safe to
// free this Manager object.
}
struct SerialDeviceImp : public SerialDevice
{
int fd() { return fd_; }
void fill(vector<uchar> &data) {};
int receive(vector<uchar> *data);
bool working() { return fd_ != -1; }
void expectAscii() { expecting_ascii_ = true; }
void setIsFile() { is_file_ = true; }
void setIsStdin() { is_stdin_ = true; }
protected:
pthread_mutex_t read_lock_ = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t write_lock_ = PTHREAD_MUTEX_INITIALIZER;
function<void()> on_data_;
int fd_ = -1;
bool expecting_ascii_ {}; // If true, print using safeString instead if bin2hex
bool is_file_ = false;
bool is_stdin_ = false;
friend struct SerialCommunicationManagerImp;
~SerialDeviceImp() = default;
};
int SerialDeviceImp::receive(vector<uchar> *data)
{
bool close_me = false;
pthread_mutex_lock(&read_lock_);
data->clear();
int num_read = 0;
while (true)
{
data->resize(num_read+1024);
int nr = read(fd_, &((*data)[num_read]), 1024);
if (nr > 0)
{
num_read += nr;
}
if (nr == 0)
{
if (is_stdin_ || is_file_)
{
debug("(serial) no more data on fd=%d\n", fd_);
close_me = true;
}
break;
}
if (nr < 0)
{
if (errno == EINTR && fd_ != -1) continue; // Interrupted try again.
if (errno == EAGAIN) break; // No more data available since it would block.
if (errno == EBADF)
{
debug("(serial) got EBADF for fd=%d closing it.\n", fd_);
close_me = true;
break;
}
break;
}
}
data->resize(num_read);
if (isDebugEnabled())
{
if (expecting_ascii_)
{
string msg = safeString(*data);
debug("(serial) received ascii %s\n", msg.c_str());
}
else
{
string msg = bin2hex(*data);
debug("(serial) received binary %s\n", msg.c_str());
}
}
pthread_mutex_unlock(&read_lock_);
if (close_me) close();
return num_read;
}
struct SerialDeviceTTY : public SerialDeviceImp
{
SerialDeviceTTY(string device, int baud_rate, SerialCommunicationManagerImp *manager);
~SerialDeviceTTY();
bool open(bool fail_if_not_ok);
void close();
void checkIfShouldReopen();
bool send(vector<uchar> &data);
bool working();
SerialCommunicationManager *manager() { return manager_; }
private:
string device_;
int baud_rate_ {};
SerialCommunicationManagerImp *manager_;
time_t start_since_reopen_;
int reopen_after_ {}; // Reopen the device repeatedly after this number of seconds.
// Necessary for some less than perfect dongles.
};
SerialDeviceTTY::SerialDeviceTTY(string device, int baud_rate,
SerialCommunicationManagerImp *manager)
{
device_ = device;
baud_rate_ = baud_rate;
manager_ = manager;
start_since_reopen_ = time(NULL);
reopen_after_ = manager->reopenAfter();
}
SerialDeviceTTY::~SerialDeviceTTY()
{
close();
}
bool SerialDeviceTTY::open(bool fail_if_not_ok)
{
bool ok = checkCharacterDeviceExists(device_.c_str(), fail_if_not_ok);
if (!ok) return false;
fd_ = openSerialTTY(device_.c_str(), baud_rate_);
if (fd_ == -1) {
if (fail_if_not_ok) {
error("Could not open %s with %d baud N81\n", device_.c_str(), baud_rate_);
} else {
return false;
}
}
manager_->opened(this);
verbose("(serialtty) opened %s\n", device_.c_str());
return true;
}
void SerialDeviceTTY::close()
{
if (fd_ == -1) return;
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
manager_->closed(this);
verbose("(serialtty) closed %s\n", device_.c_str());
}
void SerialDeviceTTY::checkIfShouldReopen()
{
if (fd_ != -1 && reopen_after_ > 0)
{
time_t curr = time(NULL);
time_t diff = curr-start_since_reopen_;
int available = 0;
ioctl(fd_, FIONREAD, &available);
// Is it time to reopen AND there is no data available for reading?
if (diff > reopen_after_ && !available)
{
start_since_reopen_ = curr;
debug("(serialtty) reopened after %ld seconds\n", diff);
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = openSerialTTY(device_.c_str(), baud_rate_);
if (fd_ == -1) {
error("Could not re-open %s with %d baud N81\n", device_.c_str(), baud_rate_);
}
}
}
}
bool SerialDeviceTTY::send(vector<uchar> &data)
{
if (data.size() == 0) return true;
pthread_mutex_lock(&write_lock_);
bool rc = true;
int n = data.size();
int written = 0;
while (true) {
int nw = write(fd_, &data[written], n-written);
if (nw > 0) written += nw;
if (nw < 0) {
if (errno==EINTR) continue;
rc = false;
goto end;
}
if (written == n) break;
}
if (isDebugEnabled()) {
string msg = bin2hex(data);
debug("(serial %s) sent \"%s\"\n", device_.c_str(), msg.c_str());
}
end:
pthread_mutex_unlock(&write_lock_);
return rc;
}
bool SerialDeviceTTY::working()
{
if (fd_ == -1) return false;
bool working = checkCharacterDeviceExists(device_.c_str(), false);
if (!working) {
debug("(serial) device %s is gone\n", device_.c_str());
}
return working;
}
struct SerialDeviceCommand : public SerialDeviceImp
{
SerialDeviceCommand(string command, vector<string> args, vector<string> envs,
SerialCommunicationManagerImp *manager,
function<void()> on_exit);
~SerialDeviceCommand();
bool open(bool fail_if_not_ok);
void close();
void checkIfShouldReopen() {}
bool send(vector<uchar> &data);
int available();
bool working();
SerialCommunicationManager *manager() { return manager_; }
private:
string command_;
int pid_ {};
vector<string> args_;
vector<string> envs_;
pthread_mutex_t write_lock_ = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t read_lock_ = PTHREAD_MUTEX_INITIALIZER;
SerialCommunicationManagerImp *manager_;
function<void()> on_exit_;
};
SerialDeviceCommand::SerialDeviceCommand(string command,
vector<string> args,
vector<string> envs,
SerialCommunicationManagerImp *manager,
function<void()> on_exit)
{
command_ = command;
args_ = args;
envs_ = envs;
manager_ = manager;
on_exit_ = on_exit;
}
SerialDeviceCommand::~SerialDeviceCommand()
{
close();
}
bool SerialDeviceCommand::open(bool fail_if_not_ok)
{
expectAscii();
bool ok = invokeBackgroundShell("/bin/sh", args_, envs_, &fd_, &pid_);
if (!ok) return false;
manager_->opened(this);
setIsStdin();
verbose("(serialcmd) opened %s\n", command_.c_str());
return true;
}
void SerialDeviceCommand::close()
{
if (pid_ == 0 && fd_ == -1) return;
if (pid_ && stillRunning(pid_))
{
stopBackgroundShell(pid_);
pid_ = 0;
}
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
manager_->closed(this);
verbose("(serialcmd) closed %s\n", command_.c_str());
}
bool SerialDeviceCommand::working()
{
if (fd_ == -1) return false;
if (!pid_) return false;
bool r = stillRunning(pid_);
if (r) return true;
return false;
}
bool SerialDeviceCommand::send(vector<uchar> &data)
{
if (data.size() == 0) return true;
pthread_mutex_lock(&write_lock_);
bool rc = true;
int n = data.size();
int written = 0;
while (true) {
int nw = write(fd_, &data[written], n-written);
if (nw > 0) written += nw;
if (nw < 0) {
if (errno==EINTR) continue;
rc = false;
goto end;
}
if (written == n) break;
}
if (isDebugEnabled()) {
string msg = bin2hex(data);
debug("(serial %s) sent \"%s\"\n", command_.c_str(), msg.c_str());
}
end:
pthread_mutex_unlock(&write_lock_);
return rc;
}
struct SerialDeviceFile : public SerialDeviceImp
{
SerialDeviceFile(string file, SerialCommunicationManagerImp *manager);
~SerialDeviceFile();
bool open(bool fail_if_not_ok);
void close();
void checkIfShouldReopen();
bool send(vector<uchar> &data);
int available();
SerialCommunicationManager *manager() { return manager_; }
private:
string file_;
SerialCommunicationManagerImp *manager_;
};
SerialDeviceFile::SerialDeviceFile(string file,
SerialCommunicationManagerImp *manager)
{
file_ = file;
manager_ = manager;
}
SerialDeviceFile::~SerialDeviceFile()
{
close();
}
bool SerialDeviceFile::open(bool fail_if_not_ok)
{
if (file_ == "stdin")
{
fd_ = 0;
int flags = fcntl(0, F_GETFL);
flags |= O_NONBLOCK;
fcntl(0, F_SETFL, flags);
setIsStdin();
verbose("(serialfile) reading from stdin\n");
}
else
{
bool ok = checkFileExists(file_.c_str());
if (!ok) return false;
fd_ = ::open(file_.c_str(), O_RDONLY | O_NONBLOCK);
if (fd_ == -1)
{
if (fail_if_not_ok)
{
error("Could not open file %s for reading.\n", file_.c_str());
}
else
{
return false;
}
}
setIsFile();
verbose("(serialfile) reading from file %s\n", file_.c_str());
}
manager_->opened(this);
return true;
}
void SerialDeviceFile::close()
{
if (fd_ == -1) return;
::flock(fd_, LOCK_UN);
::close(fd_);
fd_ = -1;
manager_->closed(this);
verbose("(serialtty) closed %s %d\n", file_.c_str(), fd_);
}
void SerialDeviceFile::checkIfShouldReopen()
{
}
bool SerialDeviceFile::send(vector<uchar> &data)
{
return true;
}
struct SerialDeviceSimulator : public SerialDeviceImp
{
SerialDeviceSimulator(SerialCommunicationManagerImp *m) :
manager_(m) {
manager_->opened(this);
verbose("(serialsimulator) opened\n");
};
~SerialDeviceSimulator() { close(); };
bool open(bool fail_if_not_ok) { return true; };
void close() { manager_->closed(this); };
void checkIfShouldReopen() { }
bool send(vector<uchar> &data) { return true; };
void fill(vector<uchar> &data) { data_ = data; on_data_(); }; // Fill buffer and trigger callback.
int receive(vector<uchar> *data)
{
*data = data_;
data_.clear();
return data->size();
}
int available() { return data_.size(); }
int fd() { return -1; }
bool working() { return false; } // Only one message that has already been handled! So return false here.
SerialCommunicationManager *manager() { return manager_; }
private:
SerialCommunicationManagerImp *manager_;
vector<uchar> data_;
};
SerialCommunicationManagerImp::SerialCommunicationManagerImp(time_t exit_after_seconds,
time_t reopen_after_seconds,
bool start_event_loop)
{
running_ = true;
max_fd_ = 0;
// Block the event loop until everything is configured.
if (start_event_loop)
{
pthread_mutex_lock(&event_loop_lock_);
pthread_create(&thread_, NULL, startLoop, this);
}
wakeMeUpOnSigChld(thread_);
start_time_ = time(NULL);
exit_after_seconds_ = exit_after_seconds;
reopen_after_seconds_ = reopen_after_seconds;
}
void *SerialCommunicationManagerImp::startLoop(void *a)
{
auto t = (SerialCommunicationManagerImp*)a;
return t->eventLoop();
}
unique_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceTTY(string device,
int baud_rate)
{
return unique_ptr<SerialDevice>(new SerialDeviceTTY(device, baud_rate, this));
}
unique_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceCommand(string command,
vector<string> args,
vector<string> envs,
function<void()> on_exit)
{
return unique_ptr<SerialDevice>(new SerialDeviceCommand(command, args, envs, this, on_exit));
}
unique_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceFile(string file)
{
return unique_ptr<SerialDevice>(new SerialDeviceFile(file, this));
}
unique_ptr<SerialDevice> SerialCommunicationManagerImp::createSerialDeviceSimulator()
{
return unique_ptr<SerialDevice>(new SerialDeviceSimulator(this));
}
void SerialCommunicationManagerImp::listenTo(SerialDevice *sd, function<void()> cb)
{
SerialDeviceImp *si = dynamic_cast<SerialDeviceImp*>(sd);
if (!si)
{
error("Internal error: Invalid serial device passed to listenTo.\n");
}
si->on_data_ = cb;
}
void SerialCommunicationManagerImp::stop()
{
// Notify the main waitForStop thread that we are stopped!
if (running_ == true)
{
debug("(serial) stopping manager\n");
running_ = false;
if (main_thread_ != 0)
{
if (signalsInstalled())
{
if (main_thread_) pthread_kill(main_thread_, SIGUSR2);
if (thread_) pthread_kill(thread_, SIGUSR1);
}
}
}
}
void SerialCommunicationManagerImp::startEventLoop()
{
// Release the event loop!
pthread_mutex_unlock(&event_loop_lock_);
}
void SerialCommunicationManagerImp::waitForStop()
{
debug("(serial) waiting for stop\n");
expect_devices_to_work_ = true;
main_thread_ = pthread_self();
while (running_)
{
pthread_mutex_lock(&devices_lock_);
size_t s = devices_.size();
pthread_mutex_unlock(&devices_lock_);
if (s == 0) {
break;
}
usleep(1000*1000);
}
if (signalsInstalled())
{
if (thread_) pthread_kill(thread_, SIGUSR1);
}
pthread_join(thread_, NULL);
debug("(serial) closing %d devices\n", devices_.size());
closeAll();
}
bool SerialCommunicationManagerImp::isRunning()
{
return running_;
}
void SerialCommunicationManagerImp::setReopenAfter(int seconds)
{
reopen_after_seconds_ = seconds;
}
void SerialCommunicationManagerImp::opened(SerialDeviceImp *sd)
{
pthread_mutex_lock(&devices_lock_);
max_fd_ = max(sd->fd(), max_fd_);
devices_.push_back(sd);
if (signalsInstalled())
{
if (thread_) pthread_kill(thread_, SIGUSR1);
}
pthread_mutex_unlock(&devices_lock_);
}
void SerialCommunicationManagerImp::closed(SerialDeviceImp *sd)
{
pthread_mutex_lock(&devices_lock_);
auto p = find(devices_.begin(), devices_.end(), sd);
if (p != devices_.end())
{
devices_.erase(p);
}
max_fd_ = 0;
for (SerialDevice *d : devices_)
{
if (d->fd() > max_fd_)
{
max_fd_ = d->fd();
}
}
if (devices_.size() == 0 && expect_devices_to_work_)
{
debug("(serial) no devices working\n");
stop();
}
pthread_mutex_unlock(&devices_lock_);
}
void SerialCommunicationManagerImp::closeAll()
{
pthread_mutex_lock(&devices_lock_);
vector<SerialDeviceImp*> copy = devices_;
pthread_mutex_unlock(&devices_lock_);
for (SerialDeviceImp *d : copy)
{
closed(d);
}
}
void *SerialCommunicationManagerImp::eventLoop()
{
fd_set readfds;
pthread_mutex_lock(&event_loop_lock_);
while (running_)
{
FD_ZERO(&readfds);
bool all_working = true;
pthread_mutex_lock(&devices_lock_);
for (SerialDevice *d : devices_)
{
FD_SET(d->fd(), &readfds);
if (!d->working()) all_working = false;
}
pthread_mutex_unlock(&devices_lock_);
if (!all_working)
{
stop();
break;
}
struct timeval timeout { 10, 0 };
if (exit_after_seconds_ > 0)
{
time_t curr = time(NULL);
time_t diff = curr-start_time_;
if (diff > exit_after_seconds_) {
verbose("(serial) exit after %ld seconds\n", diff);
stop();
break;
}
timeout.tv_sec = exit_after_seconds_ - diff;
}
bool num_devices = 0;
pthread_mutex_lock(&devices_lock_);
for (SerialDevice *d : devices_)
{
d->checkIfShouldReopen();
}
num_devices = devices_.size();
pthread_mutex_unlock(&devices_lock_);
if (num_devices == 0 && expect_devices_to_work_)
{
debug("(serial) no working devices, stopping before entering select.\n");
stop();
break;
}
int activity = select(max_fd_+1 , &readfds, NULL , NULL, &timeout);
if (!running_) break;
if (activity < 0 && errno!=EINTR)
{
warning("(serial) internal error after select! errno=%s\n", strerror(errno));
}
if (activity > 0)
{
// Something has happened that caused the sleeping select to wake up.
vector<SerialDeviceImp*> to_be_notified;
pthread_mutex_lock(&devices_lock_);
for (SerialDevice *d : devices_)
{
if (FD_ISSET(d->fd(), &readfds))
{
SerialDeviceImp *si = dynamic_cast<SerialDeviceImp*>(d);
to_be_notified.push_back(si);
}
}
pthread_mutex_unlock(&devices_lock_);
for (SerialDeviceImp *si : to_be_notified)
{
if (si->on_data_)
{
si->on_data_();
}
}
}
vector<SerialDeviceImp*> non_working;
pthread_mutex_lock(&devices_lock_);
for (SerialDeviceImp *d : devices_)
{
if (!d->working()) non_working.push_back(d);
}
pthread_mutex_unlock(&devices_lock_);
for (SerialDeviceImp *d : non_working)
{
debug("(serial) closing non working fd=%d\n", d->fd());
d->close();
}
if (non_working.size() > 0)
{
stop();
break;
}
}
verbose("(serial) event loop stopped!\n");
pthread_mutex_unlock(&event_loop_lock_);
return NULL;
}
unique_ptr<SerialCommunicationManager> createSerialCommunicationManager(time_t exit_after_seconds,
time_t reopen_after_seconds,
bool start_event_loop)
{
return unique_ptr<SerialCommunicationManager>(new SerialCommunicationManagerImp(exit_after_seconds,
reopen_after_seconds,
start_event_loop));
}
static int openSerialTTY(const char *tty, int baud_rate)
{
int rc = 0;
speed_t speed = 0;
struct termios tios;
int fd = open(tty, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd == -1) {
usleep(1000*1000);
fd = open(tty, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd == -1) goto err;
}
rc = flock(fd, LOCK_EX | LOCK_NB);
if (rc == -1)
{
// It is already locked by another wmbusmeter process.
warning("Device %s is already in use and locked.\n", tty);
goto err;
}
switch (baud_rate)
{
case 9600: speed = B9600; break;
case 19200: speed = B19200; break;
case 38400: speed = B38400; break;
case 57600: speed = B57600; break;
case 115200: speed = B115200;break;
default:
goto err;
}
memset(&tios, 0, sizeof(tios));
rc = cfsetispeed(&tios, speed);
if (rc < 0) goto err;
rc = cfsetospeed(&tios, speed);
if (rc < 0) goto err;
tios.c_cflag |= (CREAD | CLOCAL);
tios.c_cflag &= ~CSIZE;
tios.c_cflag |= CS8;
tios.c_cflag &=~ CSTOPB;
tios.c_cflag &=~ PARENB;
tios.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
tios.c_iflag &= ~INPCK;
tios.c_iflag &= ~(IXON | IXOFF | IXANY);
tios.c_oflag &=~ OPOST;
tios.c_cc[VMIN] = 0;
tios.c_cc[VTIME] = 0;
rc = tcsetattr(fd, TCSANOW, &tios);
if (rc < 0) goto err;
return fd;
err:
if (fd != -1) close(fd);
return -1;
}
SerialCommunicationManager::~SerialCommunicationManager()
{
}
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