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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "conn.h"
#include "exceptions.h"
#include "legacy_forwarder.h"
#include "metrics.h"
#include <vespa/log/log_message.h>
#include <vespa/log/exceptions.h>
#include <vespa/vespalib/component/vtag.h>
#include <vespa/vespalib/locale/c.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <fcntl.h>
#include <unistd.h>
#include <sstream>
#include <vespa/log/log.h>
LOG_SETUP("");
using LogLevel = ns_log::Logger::LogLevel;
using ns_log::BadLogLineException;
using ns_log::LogMessage;
using ns_log::Logger;
using LogLevel = Logger::LogLevel;
using vespalib::make_string;
namespace logdemon {
void
LegacyForwarder::connect_to_logserver(const vespalib::string& logserver_host, int logserver_port)
{
int new_fd = makeconn(logserver_host.c_str(), logserver_port);
if (new_fd >= 0) {
LOG(debug, "Connected to logserver at %s:%d", logserver_host.c_str(), logserver_port);
_logserver_fd = new_fd;
} else {
auto error_msg = make_string("Could not connect to %s:%d", logserver_host.c_str(), logserver_port);
LOG(debug, "%s", error_msg.c_str());
throw ConnectionException(error_msg);
}
}
void
LegacyForwarder::connect_to_dev_null()
{
int new_fd = open("/dev/null", O_RDWR);
if (new_fd >= 0) {
LOG(debug, "Opened /dev/null for read/write");
_logserver_fd = new_fd;
} else {
auto error_msg = make_string("Error opening /dev/null (%d): %s", new_fd, strerror(new_fd));
LOG(debug, "%s", error_msg.c_str());
throw ConnectionException(error_msg);
}
}
LegacyForwarder::LegacyForwarder(Metrics &metrics, const ForwardMap& forward_filter)
:
_metrics(metrics),
_logserver_fd(-1),
_forward_filter(forward_filter),
_badLines(0)
{
}
LegacyForwarder::UP
LegacyForwarder::to_logserver(Metrics& metrics, const ForwardMap& forward_filter,
const vespalib::string& logserver_host, int logserver_port)
{
LegacyForwarder::UP result(new LegacyForwarder(metrics, forward_filter));
result->connect_to_logserver(logserver_host, logserver_port);
return result;
}
LegacyForwarder::UP
LegacyForwarder::to_dev_null(Metrics& metrics)
{
LegacyForwarder::UP result(new LegacyForwarder(metrics, ForwardMap()));
result->connect_to_dev_null();
return result;
}
LegacyForwarder::UP
LegacyForwarder::to_open_file(Metrics& metrics, const ForwardMap& forward_filter, int file_desc)
{
LegacyForwarder::UP result(new LegacyForwarder(metrics, forward_filter));
result->_logserver_fd = file_desc;
return result;
}
LegacyForwarder::~LegacyForwarder()
{
if (_logserver_fd >= 0) {
close(_logserver_fd);
}
}
void
LegacyForwarder::forwardText(const char *text, int len)
{
int wsize = write(_logserver_fd, text, len);
if (wsize != len) {
if (wsize > 0) {
LOG(warning, "only wrote %d of %d bytes to logserver", wsize, len);
} else {
LOG(warning, "problem sending data to logserver: %s", strerror(errno));
}
throw ConnectionException("problem sending data");
}
}
void
LegacyForwarder::sendMode()
{
char buf[1024];
snprintf(buf, 1024, "mode logd %s\n", vespalib::VersionTag);
int len = strlen(buf);
if (len < 100) {
forwardText(buf, len);
} else {
LOG(warning, "too long mode line: %s", buf);
}
}
void
LegacyForwarder::forwardLine(std::string_view line)
{
assert(_logserver_fd >= 0);
assert (line.size() < 1024*1024);
if (parseLine(line)) {
std::ostringstream line_copy;
line_copy << line << std::endl;
forwardText(line_copy.str().data(), line_copy.str().size());
}
}
bool
LegacyForwarder::parseLine(std::string_view line)
{
LogMessage message;
try {
message.parse_log_line(line);
} catch (BadLogLineException &e) {
LOG(spam, "bad logline: %s", e.what());
++_badLines;
return false;
}
std::string logLevelName;
if (message.level() >= LogLevel::NUM_LOGLEVELS) {
logLevelName = "unknown";
} else {
logLevelName = Logger::logLevelNames[message.level()];
}
_metrics.countLine(logLevelName, message.service());
// Check overrides
auto found = _forward_filter.find(message.level());
if (found != _forward_filter.end()) {
return found->second;
}
return false; // Unknown log level
}
} // namespace
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