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#include <unistd.h>
#include "remote_logger.hh"
#include <sys/uio.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef PDNS_CONFIG_ARGS
#include "logger.hh"
#define WE_ARE_RECURSOR
#else
#include "dolog.hh"
#endif
void CircularWriteBuffer::write(const std::string& str)
{
if(d_buffer.size() + 2 + str.size() > d_buffer.capacity())
flush();
if(d_buffer.size() + 2 + str.size() > d_buffer.capacity())
throw std::runtime_error("Full!");
uint16_t len = htons(str.size());
char* ptr = (char*)&len;
d_buffer.insert(d_buffer.end(), ptr, ptr + 2);
d_buffer.insert(d_buffer.end(), str.begin(), str.end());
}
void CircularWriteBuffer::flush()
{
if(d_buffer.empty()) // not optional, we report EOF otherwise
return;
auto arr1 = d_buffer.array_one();
auto arr2 = d_buffer.array_two();
struct iovec iov[2];
int pos=0;
size_t total=0;
for(const auto& arr : {arr1, arr2}) {
if(arr.second) {
iov[pos].iov_base = arr.first;
iov[pos].iov_len = arr.second;
total += arr.second;
++pos;
}
}
int res = writev(d_fd, iov, pos);
if(res < 0) {
throw std::runtime_error("Couldn't flush a thing: "+string(strerror(errno)));
}
if(!res) {
throw std::runtime_error("EOF");
}
// cout<<"Flushed "<<res<<" bytes out of " << total <<endl;
if((size_t)res == d_buffer.size())
d_buffer.clear();
else {
while(res--)
d_buffer.pop_front();
}
}
RemoteLogger::RemoteLogger(const ComboAddress& remote, uint16_t timeout, uint64_t maxQueuedBytes, uint8_t reconnectWaitTime, bool asyncConnect): d_remote(remote), d_maxQueuedBytes(maxQueuedBytes), d_timeout(timeout), d_reconnectWaitTime(reconnectWaitTime), d_asyncConnect(asyncConnect)
{
if (!d_asyncConnect) {
if(reconnect())
d_writer = make_unique<CircularWriteBuffer>(d_socket, d_maxQueuedBytes);
}
d_thread = std::thread(&RemoteLogger::maintenanceThread, this);
}
bool RemoteLogger::reconnect()
{
if (d_socket >= 0) {
close(d_socket);
d_socket = -1;
}
try {
d_socket = SSocket(d_remote.sin4.sin_family, SOCK_STREAM, 0);
setNonBlocking(d_socket);
SConnectWithTimeout(d_socket, d_remote, d_timeout);
}
catch(const std::exception& e) {
#ifdef WE_ARE_RECURSOR
L<<Logger::Warning<<"Error connecting to remote logger "<<d_remote.toStringWithPort()<<": "<<e.what()<<std::endl;
#else
warnlog("Error connecting to remote logger %s: %s", d_remote.toStringWithPort(), e.what());
#endif
return false;
}
return true;
}
void RemoteLogger::queueData(const std::string& data)
{
if(!d_writer) {
d_drops++;
return;
}
std::unique_lock<std::mutex> lock(d_mutex);
if(d_writer) {
try {
d_writer->write(data);
}
catch(std::exception& e) {
// cout << "Got exception writing: "<<e.what()<<endl;
d_drops++;
d_writer.reset();
close(d_socket);
d_socket = -1;
}
}
}
void RemoteLogger::maintenanceThread()
try
{
for(;;) {
if(d_exiting)
break;
if(d_writer) {
std::unique_lock<std::mutex> lock(d_mutex);
if(d_writer) { // check if it is still set
// cout<<"Flush"<<endl;
try {
d_writer->flush();
}
catch(std::exception& e) {
// cout<<"Flush failed!"<<endl;
d_writer.reset();
close(d_socket);
d_socket = -1;
}
}
}
else if(reconnect()) { // if it was zero, it will remain zero, we are the only ones setting it!
std::unique_lock<std::mutex> lock(d_mutex);
d_writer = make_unique<CircularWriteBuffer>(d_socket, d_maxQueuedBytes);
}
sleep(d_reconnectWaitTime);
}
}
catch(std::exception& e)
{
cerr<<"Thead died on: "<<e.what()<<endl;
}
RemoteLogger::~RemoteLogger()
{
d_exiting = true;
if (d_socket >= 0) {
close(d_socket);
d_socket = -1;
}
d_thread.join();
}
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