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Don't update battery list on every update 

Speedup battery state update by only updating the battery list when we
get a CREATE/DELETE event in the directory or whenever we do a full
refresh on the interval.
This commit is contained in:
Pedro Côrte-Real 2020-12-03 09:52:33 +00:00
parent cc365a8175
commit 09c89bcd20
2 changed files with 41 additions and 19 deletions
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7
include/modules/battery.hpp
View File

@ -34,16 +34,19 @@ class Battery : public ALabel {
void refreshBatteries();
void worker();
const std::string getAdapterStatus(uint8_t capacity) const;
const std::tuple<uint8_t, float, std::string> getInfos() const;
const std::tuple<uint8_t, float, std::string> getInfos();
const std::string formatTimeRemaining(float hoursRemaining);
int global_watch;
std::map<fs::path,int> batteries_;
fs::path adapter_;
int fd_;
int battery_watch_fd_;
int global_watch_fd_;
std::mutex battery_list_mutex_;
std::string old_status_;
util::SleeperThread thread_;
util::SleeperThread thread_battery_update_;
util::SleeperThread thread_timer_;
};

53
src/modules/battery.cpp
View File

@ -4,13 +4,18 @@
waybar::modules::Battery::Battery(const std::string& id, const Json::Value& config)
: ALabel(config, "battery", id, "{capacity}%", 60) {
fd_ = inotify_init1(IN_CLOEXEC);
if (fd_ == -1) {
battery_watch_fd_ = inotify_init1(IN_CLOEXEC);
if (battery_watch_fd_ == -1) {
throw std::runtime_error("Unable to listen batteries.");
}
global_watch_fd_ = inotify_init1(IN_CLOEXEC);
if (global_watch_fd_ == -1) {
throw std::runtime_error("Unable to listen batteries.");
}
// Watch the directory for any added or removed batteries
global_watch = inotify_add_watch(fd_, data_dir_.c_str(), IN_CREATE | IN_DELETE);
global_watch = inotify_add_watch(global_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");
}
@ -20,38 +25,55 @@ waybar::modules::Battery::Battery(const std::string& id, const Json::Value& conf
}
waybar::modules::Battery::~Battery() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
if (global_watch >= 0) {
inotify_rm_watch(fd_, global_watch);
inotify_rm_watch(global_watch_fd_, global_watch);
}
close(global_watch_fd_);
for (auto it = batteries_.cbegin(); it != batteries_.cend(); it++) {
auto watch_id = (*it).second;
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
inotify_rm_watch(battery_watch_fd_, watch_id);
}
batteries_.erase(it);
}
close(fd_);
close(battery_watch_fd_);
}
void waybar::modules::Battery::worker() {
thread_timer_ = [this] {
// Make sure we eventually update the list of batteries even if we miss an
// inotify event for some reason
refreshBatteries();
dp.emit();
thread_timer_.sleep_for(interval_);
};
thread_ = [this] {
struct inotify_event event = {0};
int nbytes = read(fd_, &event, sizeof(event));
int nbytes = read(battery_watch_fd_, &event, sizeof(event));
if (nbytes != sizeof(event) || event.mask & IN_IGNORED) {
thread_.stop();
return;
}
// TODO: don't stop timer for now since there is some bugs :?
// thread_timer_.stop();
dp.emit();
};
thread_battery_update_ = [this] {
struct inotify_event event = {0};
int nbytes = read(global_watch_fd_, &event, sizeof(event));
if (nbytes != sizeof(event) || event.mask & IN_IGNORED) {
thread_.stop();
return;
}
refreshBatteries();
dp.emit();
};
}
void waybar::modules::Battery::refreshBatteries() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
// Mark existing list of batteries as not necessarily found
std::map<fs::path, bool> check_map;
for (auto const& bat : batteries_) {
@ -77,7 +99,7 @@ void waybar::modules::Battery::refreshBatteries() {
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);
auto wd = inotify_add_watch(battery_watch_fd_, event_path.c_str(), IN_ACCESS);
if (wd < 0) {
throw std::runtime_error("Could not watch events for " + node.path().string());
}
@ -106,14 +128,16 @@ void waybar::modules::Battery::refreshBatteries() {
if (!check.second) {
auto watch_id = batteries_[check.first];
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
inotify_rm_watch(battery_watch_fd_, watch_id);
}
batteries_.erase(check.first);
}
}
}
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() const {
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
try {
uint32_t total_power = 0; // μW
uint32_t total_energy = 0; // μWh
@ -215,11 +239,6 @@ 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);