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Support hotplugging of batteries 

Refresh the list of batteries on update to handle hotplug correctly.
Probably fixes #490.
This commit is contained in:
Pedro Côrte-Real 2020-11-27 13:56:04 +00:00
parent 908fa2c6c2
commit 89ca155c43
2 changed files with 58 additions and 17 deletions
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6
include/modules/battery.hpp
View File

@ -31,16 +31,16 @@ class Battery : public ALabel {
private:
static inline const fs::path data_dir_ = "/sys/class/power_supply/";
void getBatteries();
void refreshBatteries();
void worker();
const std::string getAdapterStatus(uint8_t capacity) const;
const std::tuple<uint8_t, float, std::string> getInfos() const;
const std::string formatTimeRemaining(float hoursRemaining);
std::vector<fs::path> batteries_;
int global_watch;
std::map<fs::path,int> batteries_;
fs::path adapter_;
int fd_;
std::vector<int> wds_;
std::string old_status_;
util::SleeperThread thread_;

69
src/modules/battery.cpp
View File

@ -4,23 +4,31 @@
waybar::modules::Battery::Battery(const std::string& id, const Json::Value& config)
: ALabel(config, "battery", id, "{capacity}%", 60) {
getBatteries();
fd_ = inotify_init1(IN_CLOEXEC);
if (fd_ == -1) {
throw std::runtime_error("Unable to listen batteries.");
}
for (auto const& bat : batteries_) {
auto wd = inotify_add_watch(fd_, (bat / "uevent").c_str(), IN_ACCESS);
if (wd != -1) {
wds_.push_back(wd);
}
// Watch the directory for any added or removed batteries
global_watch = inotify_add_watch(fd_, data_dir_.c_str(), IN_CREATE | IN_DELETE);
if (global_watch < 0) {
throw std::runtime_error("Could not watch for battery plug/unplug");
}
refreshBatteries();
worker();
}
waybar::modules::Battery::~Battery() {
for (auto wd : wds_) {
inotify_rm_watch(fd_, wd);
if (global_watch >= 0) {
inotify_rm_watch(fd_, global_watch);
}
for (auto it = batteries_.cbegin(); it != batteries_.cend(); it++) {
auto watch_id = (*it).second;
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
}
batteries_.erase(it);
}
close(fd_);
}
@ -43,7 +51,13 @@ void waybar::modules::Battery::worker() {
};
}
void waybar::modules::Battery::getBatteries() {
void waybar::modules::Battery::refreshBatteries() {
// Mark existing list of batteries as not necessarily found
std::map<fs::path, bool> check_map;
for (auto const& bat : batteries_) {
check_map[bat.first] = false;
}
try {
for (auto& node : fs::directory_iterator(data_dir_)) {
if (!fs::is_directory(node)) {
@ -54,12 +68,22 @@ void waybar::modules::Battery::getBatteries() {
if (((bat_defined && dir_name == config_["bat"].asString()) || !bat_defined) &&
fs::exists(node.path() / "capacity") && fs::exists(node.path() / "uevent") &&
fs::exists(node.path() / "status") && fs::exists(node.path() / "type")) {
std::string type;
std::ifstream(node.path() / "type") >> type;
std::string type;
std::ifstream(node.path() / "type") >> type;
if (!type.compare("Battery")){
batteries_.push_back(node.path());
if (!type.compare("Battery")){
check_map[node.path()] = true;
auto search = batteries_.find(node.path());
if (search == batteries_.end()) {
// We've found a new battery save it and start listening for events
auto event_path = (node.path() / "uevent");
auto wd = inotify_add_watch(fd_, event_path.c_str(), IN_ACCESS);
if (wd < 0) {
throw std::runtime_error("Could not watch events for " + node.path().string());
}
batteries_[node.path()] = wd;
}
}
}
auto adap_defined = config_["adapter"].isString();
if (((adap_defined && dir_name == config_["adapter"].asString()) || !adap_defined) &&
@ -76,6 +100,17 @@ void waybar::modules::Battery::getBatteries() {
}
throw std::runtime_error("No batteries.");
}
// Remove any batteries that are no longer present and unwatch them
for (auto const& check : check_map) {
if (!check.second) {
auto watch_id = batteries_[check.first];
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
}
batteries_.erase(check.first);
}
}
}
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() const {
@ -84,7 +119,8 @@ const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos
uint32_t total_energy = 0; // μWh
uint32_t total_energy_full = 0;
std::string status = "Unknown";
for (auto const& bat : batteries_) {
for (auto const& item : batteries_) {
auto bat = item.first;
uint32_t power_now;
uint32_t energy_full;
uint32_t energy_now;
@ -175,6 +211,11 @@ const std::string waybar::modules::Battery::formatTimeRemaining(float hoursRemai
}
auto waybar::modules::Battery::update() -> void {
// Make sure we have the correct set of batteries, in case of hotplug
// TODO: split the global watch into it's own event and only run the refresh
// when there's been a CREATE/DELETE event
refreshBatteries();
auto [capacity, time_remaining, status] = getInfos();
if (status == "Unknown") {
status = getAdapterStatus(capacity);