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/* ------------------------------------------------------------------
* Copyright (C) 2020 Matthias P. Braendli
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "config.h"
#include "StatsPublish.h"
#include <stdexcept>
#include <sstream>
#include <cstring>
#include <cerrno>
#include <cassert>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <fcntl.h>
using namespace std;
StatsPublisher::StatsPublisher(const string& socket_path) :
m_socket_path(socket_path)
{
// The client socket binds to a socket whose name depends on PID, and connects to
// `socket_path`
m_sock = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (m_sock == -1) {
throw runtime_error("Stats socket creation failed: " + string(strerror(errno)));
}
int flags = fcntl(m_sock, F_GETFL);
if (flags == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("Stats socket: Could not get socket flags: " + errstr);
}
if (fcntl(m_sock, F_SETFL, flags | O_NONBLOCK) == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("Stats socket: Could not set O_NONBLOCK: " + errstr);
}
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "/tmp/odr-audioenc.%ld", (long) getpid());
int ret = ::bind(m_sock, (const struct sockaddr *) &claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
throw runtime_error("Stats socket bind failed " + string(strerror(errno)));
}
}
StatsPublisher::~StatsPublisher()
{
if (m_sock != -1) {
::close(m_sock);
}
}
void StatsPublisher::update_audio_levels(int16_t audiolevel_left, int16_t audiolevel_right)
{
m_audio_left = audiolevel_left;
m_audio_right = audiolevel_right;
}
void StatsPublisher::notify_underrun()
{
m_num_underruns++;
}
void StatsPublisher::notify_overrun()
{
m_num_overruns++;
}
void StatsPublisher::send_stats()
{
// Manually build JSON. We can be certain that
// our fields don't contain quotes
stringstream json;
json << "{ ";
json << "\"program\": \"" << PACKAGE_NAME << "\", ";
json << "\"version\": \"" <<
#if defined(GITVERSION)
GITVERSION
#else
PACKAGE_VERSION
#endif
<< "\", ";
json << "\"audiolevels\": { \"left\": " << m_audio_left << ", \"right\": " << m_audio_right << "}, ";
json << "\"driftcompensation\": { \"underruns\": " << m_num_underruns << ", \"overruns\": " << m_num_overruns << "} ";
json << "}";
const auto jsonstr = json.str();
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "%s", m_socket_path.c_str());
int ret = ::sendto(m_sock, jsonstr.data(), jsonstr.size(), 0,
(struct sockaddr *) &claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
// This suppresses the -Wlogical-op warning
if (errno == EAGAIN
#if EAGAIN != EWOULDBLOCK
or errno == EWOULDBLOCK
#endif
or errno == ECONNREFUSED
or errno == ENOENT) {
if (m_destination_available) {
fprintf(stderr, "Stats destination not available at %s\n", m_socket_path.c_str());
m_destination_available = false;
}
}
else {
fprintf(stderr, "Statistics send failed: %s\n", strerror(errno));
}
}
else if (ret != (ssize_t)jsonstr.size()) {
fprintf(stderr, "Statistics send incorrect length: %d bytes of %zu transmitted\n",
ret, jsonstr.size());
}
else if (not m_destination_available) {
fprintf(stderr, "Stats destination is now available at %s\n", m_socket_path.c_str());
m_destination_available = true;
}
m_audio_left = 0;
m_audio_right = 0;
}
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