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Adding bandwidth support for network module [linux only]

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This commit is contained in:
Lucas Lazare 2019-05-17 23:39:51 -04:00
parent 43d724ebad
commit 794fb12e8c
2 changed files with 128 additions and 2 deletions
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3
include/modules/network.hpp
View File

@ -56,6 +56,9 @@ class Network : public ALabel {
int nl80211_id_;
std::mutex mutex_;
unsigned long long bandwidth_down_total_;
unsigned long long bandwidth_up_total_;
std::string essid_;
std::string ifname_;
std::string ipaddr_;

127
src/modules/network.cpp
View File

@ -1,5 +1,70 @@
#include "modules/network.hpp"
#include <sys/eventfd.h>
#include <fstream>
namespace {
constexpr const char * NETSTAT_FILE = "/proc/net/netstat"; // std::ifstream does not take std::string_view as param
constexpr std::string_view BANDWIDTH_CATEGORY = "IpExt";
constexpr std::string_view BANDWIDTH_DOWN_TOTAL_KEY = "InOctets";
constexpr std::string_view BANDWIDTH_UP_TOTAL_KEY = "OutOctets";
std::ifstream netstat(NETSTAT_FILE);
std::optional<unsigned long long> read_netstat(std::string_view category, std::string_view key) {
if (!netstat) {
return {};
}
netstat.seekg(std::ios_base::beg);
// finding corresponding line (category)
// looks into the file for the first line starting by the 'category' string
auto starts_with = [](const std::string& str, std::string_view start) {
return start == std::string_view{str.data(), std::min(str.size(), start.size())};
};
std::string read;
while (std::getline(netstat, read) && !starts_with(read, category));
if (!starts_with(read, category)) {
return {};
}
// finding corresponding column (key)
// looks into the fetched line for the first word (space separated) equal to 'key'
int index = 0;
auto r_it = read.begin();
auto k_it = key.begin();
while (k_it != key.end() && r_it != read.end()) {
if (*r_it != *k_it) {
r_it = std::find(r_it, read.end(), ' ');
if (r_it != read.end()) {
++r_it;
}
k_it = key.begin();
++index;
} else {
++r_it;
++k_it;
}
}
if (r_it == read.end() && k_it != key.end()) {
return {};
}
// finally accessing value
// accesses the line right under the fetched one
std::getline(netstat, read);
assert(starts_with(read, category));
std::istringstream iss(read);
while (index--) {
std::getline(iss, read, ' ');
}
unsigned long long value;
iss >> value;
return value;
}
}
waybar::modules::Network::Network(const std::string &id, const Json::Value &config)
: ALabel(config, "{ifname}", 60),
@ -16,6 +81,21 @@ waybar::modules::Network::Network(const std::string &id, const Json::Value &conf
if (!id.empty()) {
label_.get_style_context()->add_class(id);
}
auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
if (down_octets) {
bandwidth_down_total_ = *down_octets;
} else {
bandwidth_down_total_ = 0;
}
if (up_octets) {
bandwidth_up_total_ = *up_octets;
} else {
bandwidth_up_total_ = 0;
}
createInfoSocket();
createEventSocket();
auto default_iface = getPreferredIface();
@ -131,6 +211,22 @@ void waybar::modules::Network::worker() {
}
auto waybar::modules::Network::update() -> void {
auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
unsigned long long bandwidth_down = 0;
if (down_octets) {
bandwidth_down = *down_octets - bandwidth_down_total_;
bandwidth_down_total_ = *down_octets;
}
unsigned long long bandwidth_up = 0;
if (up_octets) {
bandwidth_up = *up_octets - bandwidth_up_total_;
bandwidth_up_total_ = *up_octets;
}
std::string connectiontype;
std::string tooltip_format = "";
if (config_["tooltip-format"].isString()) {
@ -177,6 +273,25 @@ auto waybar::modules::Network::update() -> void {
format_ = default_format_;
}
getState(signal_strength_);
auto pow_format = [](unsigned long long value, const std::string& unit) {
if (value > 2000ull * 1000ull * 1000ull) { // > 2G
auto go = value / (1000 * 1000 * 1000);
return std::to_string(go) + "." + std::to_string((value - go * 1000 * 1000 * 1000) / (100 * 1000 * 1000)) + "G" + unit;
} else if (value > 2000ull * 1000ull) { // > 2M
auto mo = value / (1000 * 1000);
return std::to_string(mo) + "." + std::to_string((value - mo * 1000 * 1000) / (100 * 1000)) + "M" + unit;
} else if (value > 2000ull) { // > 2k
auto ko = value / 1000;
return std::to_string(ko) + "." + std::to_string((value - ko * 1000) / 100) + "k" + unit;
} else {
return std::to_string(value) + unit;
}
};
auto text = fmt::format(format_,
fmt::arg("essid", essid_),
fmt::arg("signaldBm", signal_strength_dbm_),
@ -186,7 +301,11 @@ auto waybar::modules::Network::update() -> void {
fmt::arg("ipaddr", ipaddr_),
fmt::arg("cidr", cidr_),
fmt::arg("frequency", frequency_),
fmt::arg("icon", getIcon(signal_strength_, connectiontype)));
fmt::arg("icon", getIcon(signal_strength_, connectiontype)),
fmt::arg("bandwidthDownBits", pow_format(bandwidth_down * 8ull, "b")),
fmt::arg("bandwidthUpBits", pow_format(bandwidth_up * 8ull, "b")),
fmt::arg("bandwidthDownOctets", pow_format(bandwidth_down, "o")),
fmt::arg("bandwidthUpOctets", pow_format(bandwidth_up, "o")));
label_.set_markup(text);
if (tooltipEnabled()) {
if (!tooltip_format.empty()) {
@ -199,7 +318,11 @@ auto waybar::modules::Network::update() -> void {
fmt::arg("ipaddr", ipaddr_),
fmt::arg("cidr", cidr_),
fmt::arg("frequency", frequency_),
fmt::arg("icon", getIcon(signal_strength_, connectiontype)));
fmt::arg("icon", getIcon(signal_strength_, connectiontype)),
fmt::arg("bandwidthDownBits", pow_format(bandwidth_down * 8ull, "b")),
fmt::arg("bandwidthUpBits", pow_format(bandwidth_up * 8ull, "b")),
fmt::arg("bandwidthDownOctets", pow_format(bandwidth_down, "o")),
fmt::arg("bandwidthUpOctets", pow_format(bandwidth_up, "o")));
label_.set_tooltip_text(tooltip_text);
} else {
label_.set_tooltip_text(text);