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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 "exceptions.h"
#include "legacy_forwarder.h"
#include "metrics.h"
#include <vespa/vespalib/component/vtag.h>
#include <vespa/vespalib/locale/c.h>
#include <unistd.h>
#include <vespa/log/log.h>
LOG_SETUP("");
using LogLevel = ns_log::Logger::LogLevel;
namespace logdemon {
LegacyForwarder::LegacyForwarder(Metrics &metrics)
: _logserverfd(-1),
_metrics(metrics),
_forwardMap(),
_levelparser(),
_badLines(0)
{}
LegacyForwarder::~LegacyForwarder() = default;
void
LegacyForwarder::forwardText(const char *text, int len)
{
int wsize = write(_logserverfd, 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(const char *line, const char *eol)
{
int linelen = eol - line;
assert(_logserverfd >= 0);
assert (linelen > 0);
assert (linelen < 1024*1024);
assert (line[linelen - 1] == '\n');
if (parseline(line, eol)) {
forwardText(line, linelen);
}
}
bool
LegacyForwarder::parseline(const char *linestart, const char *lineend)
{
int llength = lineend - linestart;
const char *fieldstart = linestart;
// time
const char *tab = strchr(fieldstart, '\t');
if (tab == nullptr || tab == fieldstart) {
LOG(spam, "bad logline no 1. tab: %.*s", llength, linestart);
++_badLines;
return false;
}
char *eod;
double logtime = vespalib::locale::c::strtod(fieldstart, &eod);
if (eod != tab) {
int fflen = tab - linestart;
LOG(spam, "bad logline first field not strtod parsable: %.*s", fflen, linestart);
++_badLines;
return false;
}
time_t now = time(nullptr);
if (logtime - 864000 > now) {
int fflen = tab - linestart;
LOG(warning, "bad logline, time %.*s > 10 days in the future", fflen, linestart);
++_badLines;
return false;
}
if (logtime + 8640000 < now) {
int fflen = tab - linestart;
LOG(warning, "bad logline, time %.*s > 100 days in the past", fflen, linestart);
++_badLines;
return false;
}
// hostname
fieldstart = tab + 1;
tab = strchr(fieldstart, '\t');
if (tab == nullptr) {
LOG(spam, "bad logline no 2. tab: %.*s", llength, linestart);
++_badLines;
return false;
}
// pid
fieldstart = tab + 1;
tab = strchr(fieldstart, '\t');
if (tab == nullptr || tab == fieldstart) {
LOG(spam, "bad logline no 3. tab: %.*s", llength, linestart);
return false;
}
// service
fieldstart = tab + 1;
tab = strchr(fieldstart, '\t');
if (tab == nullptr) {
LOG(spam, "bad logline no 4. tab: %.*s", llength, linestart);
++_badLines;
return false;
}
if (tab == fieldstart) {
LOG(spam, "empty service in logline: %.*s", llength, linestart);
}
std::string service(fieldstart, tab-fieldstart);
// component
fieldstart = tab + 1;
tab = strchr(fieldstart, '\t');
if (tab == nullptr || tab == fieldstart) {
LOG(spam, "bad logline no 5. tab: %.*s", llength, linestart);
++_badLines;
return false;
}
std::string component(fieldstart, tab-fieldstart);
// level
fieldstart = tab + 1;
tab = strchr(fieldstart, '\t');
if (tab == nullptr || tab == fieldstart) {
LOG(spam, "bad logline no 6. tab: %.*s", llength, linestart);
++_badLines;
return false;
}
std::string level(fieldstart, tab-fieldstart);
LogLevel l = _levelparser.parseLevel(level.c_str());
// rest is freeform message, must be on this line:
if (tab > lineend) {
LOG(spam, "bad logline last tab after end: %.*s", llength, linestart);
++_badLines;
return false;
}
_metrics.countLine(level, service);
// Check overrides
ForwardMap::iterator found = _forwardMap.find(l);
if (found != _forwardMap.end()) {
return found->second;
}
return false; // Unknown log level
}
LogLevel
LevelParser::parseLevel(const char *level)
{
using ns_log::Logger;
LogLevel l = Logger::parseLevel(level);
if (l >= 0 && l <= Logger::NUM_LOGLEVELS) {
return l;
}
if (_seenLevelMap.find(level) == _seenLevelMap.end()) {
LOG(warning, "unknown level '%s'", level);
_seenLevelMap.insert(level);
}
return Logger::fatal;
}
} // namespace
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