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foundationdb/flow/Trace.cpp

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/*
* Trace.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
*
* 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 "flow/Trace.h"
#include "flow/FileTraceLogWriter.h"
#include "flow/Knobs.h"
#include "flow/XmlTraceLogFormatter.h"
#include "flow/JsonTraceLogFormatter.h"
#include "flow/flow.h"
#include "flow/DeterministicRandom.h"
#include <stdlib.h>
#include <stdarg.h>
#include <cctype>
#include <time.h>
#include <set>
#include <iomanip>
#include "flow/IThreadPool.h"
#include "flow/ThreadHelper.actor.h"
#include "flow/FastRef.h"
#include "flow/EventTypes.actor.h"
#include "flow/TDMetric.actor.h"
#include "flow/MetricSample.h"
#ifdef _WIN32
#include <windows.h>
#undef max
#undef min
#endif
// Allocations can only be logged when this value is 0.
// Anybody that needs to disable tracing should increment this by 1 for the duration
// that they need the disabling to be in effect.
//
// This is done for multiple reasons:
// 1. To avoid recursion in the allocation tracing when each trace event does an allocation
// 2. To avoid a historically documented but unknown crash that occurs when logging allocations
// during an open trace event
thread_local int g_allocation_tracing_disabled = 1;
unsigned tracedLines = 0;
thread_local int failedLineOverflow = 0;
ITraceLogIssuesReporter::~ITraceLogIssuesReporter() {}
struct SuppressionMap {
struct SuppressionInfo {
double endTime;
int64_t suppressedEventCount;
SuppressionInfo() : endTime(0), suppressedEventCount(0) {}
};
std::map<std::string, SuppressionInfo> suppressionMap;
// Returns -1 if this event is suppressed
int64_t checkAndInsertSuppression(std::string type, double duration) {
ASSERT(g_network);
if (suppressionMap.size() >= FLOW_KNOBS->MAX_TRACE_SUPPRESSIONS) {
TraceEvent(SevWarnAlways, "ClearingTraceSuppressionMap").log();
suppressionMap.clear();
}
auto insertion = suppressionMap.insert(std::make_pair(type, SuppressionInfo()));
if (insertion.second || insertion.first->second.endTime <= now()) {
int64_t suppressedEventCount = insertion.first->second.suppressedEventCount;
insertion.first->second.endTime = now() + duration;
insertion.first->second.suppressedEventCount = 0;
return suppressedEventCount;
} else {
++insertion.first->second.suppressedEventCount;
return -1;
}
}
};
#define TRACE_BATCH_IMPLICIT_SEVERITY SevInfo
TraceBatch g_traceBatch;
std::atomic<trace_clock_t> g_trace_clock{ TRACE_CLOCK_NOW };
LatestEventCache latestEventCache;
SuppressionMap suppressedEvents;
static TransientThresholdMetricSample<Standalone<StringRef>>* traceEventThrottlerCache;
static const char* TRACE_EVENT_THROTTLE_STARTING_TYPE = "TraceEventThrottle_";
static const char* TRACE_EVENT_INVALID_SUPPRESSION = "InvalidSuppression_";
static int TRACE_LOG_MAX_PREOPEN_BUFFER = 1000000;
struct TraceLog {
Reference<ITraceLogFormatter> formatter;
private:
Reference<ITraceLogWriter> logWriter;
std::vector<TraceEventFields> eventBuffer;
int loggedLength;
int bufferLength;
std::atomic<bool> opened;
int64_t preopenOverflowCount;
std::string basename;
std::string logGroup;
std::map<std::string, std::string> universalFields;
std::string directory;
std::string processName;
Optional<NetworkAddress> localAddress;
std::string tracePartialFileSuffix;
Reference<IThreadPool> writer;
uint64_t rollsize;
Mutex mutex;
EventMetricHandle<TraceEventNameID> SevErrorNames;
EventMetricHandle<TraceEventNameID> SevWarnAlwaysNames;
EventMetricHandle<TraceEventNameID> SevWarnNames;
EventMetricHandle<TraceEventNameID> SevInfoNames;
EventMetricHandle<TraceEventNameID> SevDebugNames;
struct RoleInfo {
std::map<std::string, int> roles;
std::string rolesString;
void refreshRolesString() {
rolesString = "";
for (auto itr : roles) {
if (!rolesString.empty()) {
rolesString += ",";
}
rolesString += itr.first;
}
}
};
RoleInfo roleInfo;
std::map<NetworkAddress, RoleInfo> roleInfoMap;
RoleInfo& mutateRoleInfo() {
ASSERT(g_network);
if (g_network->isSimulated()) {
return roleInfoMap[g_network->getLocalAddress()];
}
return roleInfo;
}
public:
bool logTraceEventMetrics;
void initMetrics() {
SevErrorNames.init(LiteralStringRef("TraceEvents.SevError"));
SevWarnAlwaysNames.init(LiteralStringRef("TraceEvents.SevWarnAlways"));
SevWarnNames.init(LiteralStringRef("TraceEvents.SevWarn"));
SevInfoNames.init(LiteralStringRef("TraceEvents.SevInfo"));
SevDebugNames.init(LiteralStringRef("TraceEvents.SevDebug"));
logTraceEventMetrics = true;
}
struct BarrierList : ThreadSafeReferenceCounted<BarrierList> {
BarrierList() : ntriggered(0) {}
void push(ThreadFuture<Void> f) {
MutexHolder h(mutex);
barriers.push_back(f);
}
void pop() {
MutexHolder h(mutex);
unsafeTrigger(0);
barriers.pop_front();
if (ntriggered)
ntriggered--;
}
void triggerAll() {
MutexHolder h(mutex);
for (uint32_t i = ntriggered; i < barriers.size(); i++)
unsafeTrigger(i);
ntriggered = barriers.size();
}
private:
Mutex mutex;
Deque<ThreadFuture<Void>> barriers;
int ntriggered;
void unsafeTrigger(int i) {
auto b = ((ThreadSingleAssignmentVar<Void>*)barriers[i].getPtr());
if (!b->isReady())
b->send(Void());
}
};
Reference<IssuesList> issues;
Reference<BarrierList> barriers;
struct WriterThread final : IThreadPoolReceiver {
WriterThread(Reference<BarrierList> barriers,
Reference<ITraceLogWriter> logWriter,
Reference<ITraceLogFormatter> formatter)
: logWriter(logWriter), formatter(formatter), barriers(barriers) {}
void init() override {}
Reference<ITraceLogWriter> logWriter;
Reference<ITraceLogFormatter> formatter;
Reference<BarrierList> barriers;
struct Open final : TypedAction<WriterThread, Open> {
double getTimeEstimate() const override { return 0; }
};
void action(Open& o) {
logWriter->open();
logWriter->write(formatter->getHeader());
}
struct Close final : TypedAction<WriterThread, Close> {
double getTimeEstimate() const override { return 0; }
};
void action(Close& c) {
logWriter->write(formatter->getFooter());
logWriter->close();
}
struct Roll final : TypedAction<WriterThread, Roll> {
double getTimeEstimate() const override { return 0; }
};
void action(Roll& c) {
logWriter->write(formatter->getFooter());
logWriter->roll();
logWriter->write(formatter->getHeader());
}
struct Barrier final : TypedAction<WriterThread, Barrier> {
double getTimeEstimate() const override { return 0; }
};
void action(Barrier& a) { barriers->pop(); }
struct WriteBuffer final : TypedAction<WriterThread, WriteBuffer> {
std::vector<TraceEventFields> events;
WriteBuffer(std::vector<TraceEventFields> events) : events(events) {}
double getTimeEstimate() const override { return .001; }
};
void action(WriteBuffer& a) {
for (const auto& event : a.events) {
event.validateFormat();
logWriter->write(formatter->formatEvent(event));
}
if (FLOW_KNOBS->TRACE_SYNC_ENABLED) {
logWriter->sync();
}
}
struct Ping final : TypedAction<WriterThread, Ping> {
ThreadReturnPromise<Void> ack;
explicit Ping(){};
double getTimeEstimate() const override { return 0; }
};
void action(Ping& ping) {
try {
ping.ack.send(Void());
} catch (Error& e) {
TraceEvent(SevError, "CrashDebugPingActionFailed").error(e);
throw;
}
}
};
TraceLog()
: formatter(new XmlTraceLogFormatter()), loggedLength(0), bufferLength(0), opened(false), preopenOverflowCount(0),
logTraceEventMetrics(false), issues(new IssuesList), barriers(new BarrierList) {}
bool isOpen() const { return opened; }
void open(std::string const& directory,
std::string const& processName,
std::string logGroup,
std::string const& timestamp,
uint64_t rs,
uint64_t maxLogsSize,
Optional<NetworkAddress> na,
std::string const& tracePartialFileSuffix) {
ASSERT(!writer && !opened);
this->directory = directory;
this->processName = processName;
this->logGroup = logGroup;
this->localAddress = na;
this->tracePartialFileSuffix = tracePartialFileSuffix;
basename = format("%s/%s.%s.%s",
directory.c_str(),
processName.c_str(),
timestamp.c_str(),
deterministicRandom()->randomAlphaNumeric(6).c_str());
logWriter = Reference<ITraceLogWriter>(new FileTraceLogWriter(
directory,
processName,
basename,
formatter->getExtension(),
tracePartialFileSuffix,
maxLogsSize,
[this]() { barriers->triggerAll(); },
issues));
if (g_network->isSimulated())
writer = Reference<IThreadPool>(new DummyThreadPool());
else
writer = createGenericThreadPool();
writer->addThread(new WriterThread(barriers, logWriter, formatter), "fdb-trace-log");
rollsize = rs;
auto a = new WriterThread::Open;
writer->post(a);
MutexHolder holder(mutex);
if (g_network->isSimulated()) {
// We don't support early trace logs in simulation.
// This is because we don't know if we're being simulated prior to the network being created, which causes
// two ambiguities:
//
// 1. We need to employ two different methods to determine the time of an event prior to the network
// starting for real-world and simulated runs.
// 2. Simulated runs manually insert the Machine field at TraceEvent creation time. Real-world runs add this
// field at write time.
//
// Without the ability to resolve the ambiguity, we've chosen to always favor the real-world approach and
// not support such events in simulation.
eventBuffer.clear();
}
opened = true;
for (TraceEventFields& fields : eventBuffer) {
annotateEvent(fields);
}
if (preopenOverflowCount > 0) {
TraceEvent(SevWarn, "TraceLogPreopenOverflow").detail("OverflowEventCount", preopenOverflowCount);
preopenOverflowCount = 0;
}
}
void annotateEvent(TraceEventFields& fields) {
MutexHolder holder(mutex);
if (!opened || fields.isAnnotated())
return;
if (localAddress.present()) {
fields.addField("Machine", formatIpPort(localAddress.get().ip, localAddress.get().port));
}
fields.addField("LogGroup", logGroup);
RoleInfo const& r = mutateRoleInfo();
if (r.rolesString.size() > 0) {
fields.addField("Roles", r.rolesString);
}
for (auto const& field : universalFields) {
fields.addField(field.first, field.second);
}
fields.setAnnotated();
}
void writeEvent(TraceEventFields fields, std::string trackLatestKey, bool trackError) {
MutexHolder hold(mutex);
annotateEvent(fields);
if (!trackLatestKey.empty()) {
fields.addField("TrackLatestType", "Original");
}
if (!isOpen() &&
(preopenOverflowCount > 0 || bufferLength + fields.sizeBytes() > TRACE_LOG_MAX_PREOPEN_BUFFER)) {
++preopenOverflowCount;
return;
}
// FIXME: What if we are using way too much memory for buffer?
ASSERT(!isOpen() || fields.isAnnotated());
eventBuffer.push_back(fields);
bufferLength += fields.sizeBytes();
if (g_network && g_network->isSimulated()) {
// Throw an error if we have queued up a large number of events in simulation. This makes it easier to
// diagnose cases where we get stuck in a loop logging trace events that eventually runs out of memory.
// Without this we would never see any trace events from that loop, and it would be more difficult to
// identify where the process is actually stuck.
if (bufferLength > 1e8) {
fprintf(stderr, "Trace log buffer overflow\n");
fprintf(stderr, "Last event: %s\n", fields.toString().c_str());
// Setting this to 0 avoids a recurse from the assertion trace event and also prevents a situation where
// we roll the trace log only to log the single assertion event when using --crash.
bufferLength = 0;
ASSERT(false);
}
if (++tracedLines > FLOW_KNOBS->MAX_TRACE_LINES && failedLineOverflow == 0) {
failedLineOverflow = 1; // we only want to do this once
}
}
if (trackError) {
latestEventCache.setLatestError(fields);
}
if (!trackLatestKey.empty()) {
latestEventCache.set(trackLatestKey, fields);
}
}
void log(int severity, const char* name, UID id, uint64_t event_ts) {
if (!logTraceEventMetrics)
return;
EventMetricHandle<TraceEventNameID>* m = nullptr;
switch (severity) {
case SevError:
m = &SevErrorNames;
break;
case SevWarnAlways:
m = &SevWarnAlwaysNames;
break;
case SevWarn:
m = &SevWarnNames;
break;
case SevInfo:
m = &SevInfoNames;
break;
case SevDebug:
m = &SevDebugNames;
break;
default:
break;
}
if (m != nullptr) {
(*m)->name = StringRef((uint8_t*)name, strlen(name));
(*m)->id = id.toString();
(*m)->log(event_ts);
}
}
ThreadFuture<Void> flush() {
if (TraceEvent::isNetworkThread()) {
traceEventThrottlerCache->poll();
}
MutexHolder hold(mutex);
bool roll = false;
if (!eventBuffer.size())
return Void(); // SOMEDAY: maybe we still roll the tracefile here?
if (rollsize && bufferLength + loggedLength > rollsize) // SOMEDAY: more conditions to roll
roll = true;
auto a = new WriterThread::WriteBuffer(std::move(eventBuffer));
loggedLength += bufferLength;
eventBuffer = std::vector<TraceEventFields>();
bufferLength = 0;
writer->post(a);
if (roll) {
auto o = new WriterThread::Roll;
double time = 0;
writer->post(o);
std::vector<TraceEventFields> events = latestEventCache.getAllUnsafe();
for (int idx = 0; idx < events.size(); idx++) {
if (events[idx].size() > 0) {
TraceEventFields rolledFields;
for (auto itr = events[idx].begin(); itr != events[idx].end(); ++itr) {
if (itr->first == "Time") {
time = TraceEvent::getCurrentTime();
rolledFields.addField("Time", format("%.6f", time));
rolledFields.addField("OriginalTime", itr->second);
} else if (itr->first == "DateTime") {
UNSTOPPABLE_ASSERT(time > 0); // "Time" field should always come first
rolledFields.addField("DateTime", TraceEvent::printRealTime(time));
rolledFields.addField("OriginalDateTime", itr->second);
} else if (itr->first == "TrackLatestType") {
rolledFields.addField("TrackLatestType", "Rolled");
} else {
rolledFields.addField(itr->first, itr->second);
}
}
eventBuffer.push_back(rolledFields);
}
}
loggedLength = 0;
}
ThreadFuture<Void> f(new ThreadSingleAssignmentVar<Void>);
barriers->push(f);
writer->post(new WriterThread::Barrier);
return f;
}
void close() {
if (opened) {
MutexHolder hold(mutex);
// Write remaining contents
auto a = new WriterThread::WriteBuffer(std::move(eventBuffer));
loggedLength += bufferLength;
eventBuffer = std::vector<TraceEventFields>();
bufferLength = 0;
writer->post(a);
auto c = new WriterThread::Close();
writer->post(c);
ThreadFuture<Void> f(new ThreadSingleAssignmentVar<Void>);
barriers->push(f);
writer->post(new WriterThread::Barrier);
f.getBlocking();
opened = false;
}
}
void addRole(std::string const& role) {
MutexHolder holder(mutex);
RoleInfo& r = mutateRoleInfo();
++r.roles[role];
r.refreshRolesString();
}
void removeRole(std::string const& role) {
MutexHolder holder(mutex);
RoleInfo& r = mutateRoleInfo();
auto itr = r.roles.find(role);
ASSERT(itr != r.roles.end() || (g_network->isSimulated() && g_network->getLocalAddress() == NetworkAddress()));
if (itr != r.roles.end() && --(*itr).second == 0) {
r.roles.erase(itr);
r.refreshRolesString();
}
}
void setLogGroup(const std::string& logGroup) {
MutexHolder holder(mutex);
this->logGroup = logGroup;
}
void addUniversalTraceField(const std::string& name, const std::string& value) {
MutexHolder holder(mutex);
ASSERT(universalFields.count(name) == 0);
universalFields[name] = value;
}
Future<Void> pingWriterThread() {
auto ping = new WriterThread::Ping;
auto f = ping->ack.getFuture();
writer->post(ping);
return f;
}
void retrieveTraceLogIssues(std::set<std::string>& out) { return issues->retrieveIssues(out); }
~TraceLog() {
close();
if (writer)
writer->addref(); // FIXME: We are not shutting down the writer thread at all, because the ThreadPool
// shutdown mechanism is blocking (necessarily waits for current work items to finish) and
// we might not be able to finish everything.
}
};
NetworkAddress getAddressIndex() {
// ahm
// if( g_network->isSimulated() )
// return g_simulator.getCurrentProcess()->address;
// else
return g_network->getLocalAddress();
}
// This does not check for simulation, and as such is not safe for external callers
void clearPrefix_internal(std::map<std::string, TraceEventFields>& data, std::string const& prefix) {
auto first = data.lower_bound(prefix);
auto last = data.lower_bound(strinc(prefix).toString());
data.erase(first, last);
}
void LatestEventCache::clear(std::string const& prefix) {
clearPrefix_internal(latest[getAddressIndex()], prefix);
}
void LatestEventCache::clear() {
latest[getAddressIndex()].clear();
}
void LatestEventCache::set(std::string tag, const TraceEventFields& contents) {
latest[getAddressIndex()][tag] = contents;
}
TraceEventFields LatestEventCache::get(std::string const& tag) {
return latest[getAddressIndex()][tag];
}
std::vector<TraceEventFields> allEvents(std::map<std::string, TraceEventFields> const& data) {
std::vector<TraceEventFields> all;
for (auto it = data.begin(); it != data.end(); it++) {
all.push_back(it->second);
}
return all;
}
std::vector<TraceEventFields> LatestEventCache::getAll() {
return allEvents(latest[getAddressIndex()]);
}
// if in simulation, all events from all machines will be returned
std::vector<TraceEventFields> LatestEventCache::getAllUnsafe() {
std::vector<TraceEventFields> all;
for (auto it = latest.begin(); it != latest.end(); ++it) {
auto m = allEvents(it->second);
all.insert(all.end(), m.begin(), m.end());
}
return all;
}
void LatestEventCache::setLatestError(const TraceEventFields& contents) {
if (TraceEvent::isNetworkThread()) { // The latest event cache doesn't track errors that happen on other threads
latestErrors[getAddressIndex()] = contents;
}
}
TraceEventFields LatestEventCache::getLatestError() {
return latestErrors[getAddressIndex()];
}
static TraceLog g_traceLog;
namespace {
template <bool validate>
bool traceFormatImpl(std::string& format) {
std::transform(format.begin(), format.end(), format.begin(), ::tolower);
if (format == "xml") {
if (!validate) {
g_traceLog.formatter = Reference<ITraceLogFormatter>(new XmlTraceLogFormatter());
}
return true;
} else if (format == "json") {
if (!validate) {
g_traceLog.formatter = Reference<ITraceLogFormatter>(new JsonTraceLogFormatter());
}
return true;
} else {
if (!validate) {
g_traceLog.formatter = Reference<ITraceLogFormatter>(new XmlTraceLogFormatter());
}
return false;
}
}
template <bool validate>
bool traceClockSource(std::string& source) {
std::transform(source.begin(), source.end(), source.begin(), ::tolower);
if (source == "now") {
if (!validate) {
g_trace_clock.store(TRACE_CLOCK_NOW);
}
return true;
} else if (source == "realtime") {
if (!validate) {
g_trace_clock.store(TRACE_CLOCK_REALTIME);
}
return true;
} else {
return false;
}
}
std::string toString(ErrorKind errorKind) {
switch (errorKind) {
case ErrorKind::Unset:
return "Unset";
case ErrorKind::DiskIssue:
return "DiskIssue";
case ErrorKind::BugDetected:
return "BugDetected";
default:
UNSTOPPABLE_ASSERT(false);
return "";
}
}
} // namespace
bool selectTraceFormatter(std::string format) {
ASSERT(!g_traceLog.isOpen());
bool recognized = traceFormatImpl</*validate*/ false>(format);
if (!recognized) {
TraceEvent(SevWarnAlways, "UnrecognizedTraceFormat").detail("format", format);
}
return recognized;
}
bool validateTraceFormat(std::string format) {
return traceFormatImpl</*validate*/ true>(format);
}
bool selectTraceClockSource(std::string source) {
ASSERT(!g_traceLog.isOpen());
bool recognized = traceClockSource</*validate*/ false>(source);
if (!recognized) {
TraceEvent(SevWarnAlways, "UnrecognizedTraceClockSource").detail("source", source);
}
return recognized;
}
bool validateTraceClockSource(std::string source) {
return traceClockSource</*validate*/ true>(source);
}
ThreadFuture<Void> flushTraceFile() {
if (!g_traceLog.isOpen())
return Void();
return g_traceLog.flush();
}
void flushTraceFileVoid() {
if (g_network && g_network->isSimulated())
flushTraceFile();
else {
flushTraceFile().getBlocking();
}
}
void openTraceFile(const NetworkAddress& na,
uint64_t rollsize,
uint64_t maxLogsSize,
std::string directory,
std::string baseOfBase,
std::string logGroup,
std::string identifier,
std::string tracePartialFileSuffix) {
if (g_traceLog.isOpen())
return;
if (directory.empty())
directory = ".";
if (baseOfBase.empty())
baseOfBase = "trace";
std::string ip = na.ip.toString();
std::replace(ip.begin(), ip.end(), ':', '_'); // For IPv6, Windows doesn't accept ':' in filenames.
std::string baseName;
if (identifier.size() > 0) {
baseName = format("%s.%s.%s", baseOfBase.c_str(), ip.c_str(), identifier.c_str());
} else {
baseName = format("%s.%s.%d", baseOfBase.c_str(), ip.c_str(), na.port);
}
g_traceLog.open(directory,
baseName,
logGroup,
format("%lld", time(nullptr)),
rollsize,
maxLogsSize,
!g_network->isSimulated() ? na : Optional<NetworkAddress>(),
tracePartialFileSuffix);
uncancellable(recurring(&flushTraceFile, FLOW_KNOBS->TRACE_FLUSH_INTERVAL, TaskPriority::FlushTrace));
g_traceBatch.dump();
}
void initTraceEventMetrics() {
g_traceLog.initMetrics();
}
void closeTraceFile() {
g_traceLog.close();
}
bool traceFileIsOpen() {
return g_traceLog.isOpen();
}
void addTraceRole(std::string const& role) {
g_traceLog.addRole(role);
}
void removeTraceRole(std::string const& role) {
g_traceLog.removeRole(role);
}
void setTraceLogGroup(const std::string& logGroup) {
g_traceLog.setLogGroup(logGroup);
}
void addUniversalTraceField(const std::string& name, const std::string& value) {
g_traceLog.addUniversalTraceField(name, value);
}
BaseTraceEvent::BaseTraceEvent() : initialized(true), enabled(false), logged(true) {}
BaseTraceEvent::BaseTraceEvent(Severity severity, const char* type, UID id)
: initialized(false), enabled(g_network == nullptr || FLOW_KNOBS->MIN_TRACE_SEVERITY <= severity), logged(false),
severity(severity), type(type), id(id) {}
BaseTraceEvent::BaseTraceEvent(BaseTraceEvent&& ev) {
enabled = ev.enabled;
err = ev.err;
fields = std::move(ev.fields);
id = ev.id;
initialized = ev.initialized;
logged = ev.logged;
maxEventLength = ev.maxEventLength;
maxFieldLength = ev.maxFieldLength;
severity = ev.severity;
tmpEventMetric = std::move(ev.tmpEventMetric);
trackingKey = ev.trackingKey;
type = ev.type;
timeIndex = ev.timeIndex;
for (int i = 0; i < 5; i++) {
eventCounts[i] = ev.eventCounts[i];
}
networkThread = ev.networkThread;
ev.initialized = true;
ev.enabled = false;
ev.logged = true;
}
BaseTraceEvent& BaseTraceEvent::operator=(BaseTraceEvent&& ev) {
// Note: still broken if ev and this are the same memory address.
enabled = ev.enabled;
err = ev.err;
fields = std::move(ev.fields);
id = ev.id;
initialized = ev.initialized;
logged = ev.logged;
maxEventLength = ev.maxEventLength;
maxFieldLength = ev.maxFieldLength;
severity = ev.severity;
tmpEventMetric = std::move(ev.tmpEventMetric);
trackingKey = ev.trackingKey;
type = ev.type;
timeIndex = ev.timeIndex;
for (int i = 0; i < 5; i++) {
eventCounts[i] = ev.eventCounts[i];
}
networkThread = ev.networkThread;
ev.initialized = true;
ev.enabled = false;
ev.logged = true;
return *this;
}
void retrieveTraceLogIssues(std::set<std::string>& out) {
return g_traceLog.retrieveTraceLogIssues(out);
}
Future<Void> pingTraceLogWriterThread() {
return g_traceLog.pingWriterThread();
}
TraceEvent::TraceEvent(const char* type, UID id) : BaseTraceEvent(SevInfo, type, id) {
setMaxFieldLength(0);
setMaxEventLength(0);
}
TraceEvent::TraceEvent(Severity severity, const char* type, UID id) : BaseTraceEvent(severity, type, id) {
setMaxFieldLength(0);
setMaxEventLength(0);
}
TraceEvent::TraceEvent(TraceInterval& interval, UID id) : BaseTraceEvent(interval.severity, interval.type, id) {
setMaxFieldLength(0);
setMaxEventLength(0);
init(interval);
}
TraceEvent::TraceEvent(Severity severity, TraceInterval& interval, UID id)
: BaseTraceEvent(severity, interval.type, id) {
setMaxFieldLength(0);
setMaxEventLength(0);
init(interval);
}
bool BaseTraceEvent::init(TraceInterval& interval) {
bool result = init();
switch (interval.count++) {
case 0: {
detail("BeginPair", interval.pairID);
break;
}
case 1: {
detail("EndPair", interval.pairID);
break;
}
default:
ASSERT(false);
}
return result;
}
bool BaseTraceEvent::init() {
ASSERT(!logged);
if (initialized) {
return enabled;
}
initialized = true;
ASSERT(*type != '\0');
++g_allocation_tracing_disabled;
enabled = enabled && (!g_network || severity >= FLOW_KNOBS->MIN_TRACE_SEVERITY);
// Backstop to throttle very spammy trace events
if (enabled && g_network && !g_network->isSimulated() && severity > SevDebug && isNetworkThread()) {
if (traceEventThrottlerCache->isAboveThreshold(StringRef((uint8_t*)type, strlen(type)))) {
enabled = false;
TraceEvent(SevWarnAlways, std::string(TRACE_EVENT_THROTTLE_STARTING_TYPE).append(type).c_str())
.suppressFor(5);
} else {
traceEventThrottlerCache->addAndExpire(
StringRef((uint8_t*)type, strlen(type)), 1, now() + FLOW_KNOBS->TRACE_EVENT_THROTTLER_SAMPLE_EXPIRY);
}
}
if (enabled) {
tmpEventMetric = std::make_unique<DynamicEventMetric>(MetricNameRef());
if (err.isValid() && err.isInjectedFault() && severity == SevError) {
severity = SevWarnAlways;
}
detail("Severity", int(severity));
if (severity >= SevError) {
detail("ErrorKind", errorKind);
errorKindIndex = fields.size() - 1;
}
detail("Time", "0.000000");
timeIndex = fields.size() - 1;
if (FLOW_KNOBS && FLOW_KNOBS->TRACE_DATETIME_ENABLED) {
detail("DateTime", "");
}
detail("Type", type);
if (g_network && g_network->isSimulated()) {
NetworkAddress local = g_network->getLocalAddress();
detail("Machine", formatIpPort(local.ip, local.port));
}
detail("ID", id);
if (err.isValid()) {
if (err.isInjectedFault()) {
detail("ErrorIsInjectedFault", true);
}
detail("Error", err.name());
detail("ErrorDescription", err.what());
detail("ErrorCode", err.code());
}
} else {
tmpEventMetric = nullptr;
}
--g_allocation_tracing_disabled;
return enabled;
}
TraceEvent& TraceEvent::errorImpl(class Error const& error, bool includeCancelled) {
ASSERT(!logged);
if (error.code() != error_code_actor_cancelled || includeCancelled) {
err = error;
if (initialized) {
if (error.isInjectedFault()) {
detail("ErrorIsInjectedFault", true);
if (severity == SevError)
severity = SevWarnAlways;
}
detail("Error", error.name());
detail("ErrorDescription", error.what());
detail("ErrorCode", error.code());
}
if (err.isDiskError()) {
setErrorKind(ErrorKind::DiskIssue);
}
} else {
if (initialized) {
TraceEvent(g_network && g_network->isSimulated() ? SevError : SevWarnAlways,
std::string(TRACE_EVENT_INVALID_SUPPRESSION).append(type).c_str())
.suppressFor(5);
} else {
enabled = false;
}
}
return *this;
}
BaseTraceEvent& BaseTraceEvent::detailImpl(std::string&& key, std::string&& value, bool writeEventMetricField) {
init();
if (enabled) {
++g_allocation_tracing_disabled;
if (maxFieldLength >= 0 && value.size() > maxFieldLength) {
value = value.substr(0, maxFieldLength) + "...";
}
if (writeEventMetricField) {
tmpEventMetric->setField(key.c_str(), Standalone<StringRef>(StringRef(value)));
}
fields.addField(std::move(key), std::move(value));
if (maxEventLength >= 0 && fields.sizeBytes() > maxEventLength) {
TraceEvent(g_network && g_network->isSimulated() ? SevError : SevWarnAlways, "TraceEventOverflow")
.setMaxEventLength(1000)
.detail("TraceFirstBytes", fields.toString().substr(0, 300));
enabled = false;
}
--g_allocation_tracing_disabled;
}
return *this;
}
void BaseTraceEvent::setField(const char* key, int64_t value) {
++g_allocation_tracing_disabled;
tmpEventMetric->setField(key, value);
--g_allocation_tracing_disabled;
}
void BaseTraceEvent::setField(const char* key, double value) {
++g_allocation_tracing_disabled;
tmpEventMetric->setField(key, value);
--g_allocation_tracing_disabled;
}
void BaseTraceEvent::setField(const char* key, const std::string& value) {
++g_allocation_tracing_disabled;
tmpEventMetric->setField(key, Standalone<StringRef>(value));
--g_allocation_tracing_disabled;
}
BaseTraceEvent& BaseTraceEvent::detailf(std::string key, const char* valueFormat, ...) {
if (enabled) {
va_list args;
va_start(args, valueFormat);
std::string value;
int result = vsformat(value, valueFormat, args);
va_end(args);
ASSERT(result >= 0);
detailImpl(std::move(key), std::move(value));
}
return *this;
}
BaseTraceEvent& BaseTraceEvent::detailfNoMetric(std::string&& key, const char* valueFormat, ...) {
if (enabled) {
va_list args;
va_start(args, valueFormat);
std::string value;
int result = vsformat(value, valueFormat, args);
va_end(args);
ASSERT(result >= 0);
detailImpl(std::move(key),
std::move(value),
false); // Do NOT write this detail to the event metric, caller of detailfNoMetric should do that
// itself with the appropriate value type
}
return *this;
}
BaseTraceEvent& BaseTraceEvent::trackLatest(const std::string& trackingKey) {
ASSERT(!logged);
this->trackingKey = trackingKey;
ASSERT(this->trackingKey.size() != 0 && this->trackingKey[0] != '/' && this->trackingKey[0] != '\\');
return *this;
}
BaseTraceEvent& TraceEvent::sample(double sampleRate, bool logSampleRate) {
if (enabled) {
if (initialized) {
TraceEvent(g_network && g_network->isSimulated() ? SevError : SevWarnAlways,
std::string(TRACE_EVENT_INVALID_SUPPRESSION).append(type).c_str())
.suppressFor(5);
return *this;
}
enabled = enabled && deterministicRandom()->random01() < sampleRate;
if (enabled && logSampleRate) {
detail("SampleRate", sampleRate);
}
}
return *this;
}
BaseTraceEvent& TraceEvent::suppressFor(double duration, bool logSuppressedEventCount) {
ASSERT(!logged);
if (enabled) {
if (initialized) {
TraceEvent(g_network && g_network->isSimulated() ? SevError : SevWarnAlways,
std::string(TRACE_EVENT_INVALID_SUPPRESSION).append(type).c_str())
.suppressFor(5);
return *this;
}
if (g_network) {
if (isNetworkThread()) {
int64_t suppressedEventCount = suppressedEvents.checkAndInsertSuppression(type, duration);
enabled = enabled && suppressedEventCount >= 0;
if (enabled && logSuppressedEventCount) {
detail("SuppressedEventCount", suppressedEventCount);
}
} else {
TraceEvent(SevWarnAlways, "SuppressionFromNonNetworkThread").detail("Event", type);
// Choosing a detail name that is unlikely to collide with other names
detail("__InvalidSuppression__", "");
}
}
// we do not want any future calls on this trace event to disable it, because we have already counted it
// towards our suppression budget
init();
}
return *this;
}
BaseTraceEvent& BaseTraceEvent::setErrorKind(ErrorKind errorKind) {
this->errorKind = errorKind;
return *this;
}
BaseTraceEvent& BaseTraceEvent::setMaxFieldLength(int maxFieldLength) {
ASSERT(!logged);
if (maxFieldLength == 0) {
this->maxFieldLength = FLOW_KNOBS ? FLOW_KNOBS->MAX_TRACE_FIELD_LENGTH : 495;
} else {
this->maxFieldLength = maxFieldLength;
}
return *this;
}
// A unique, per-thread ID. This is particularly important for multithreaded
// or multiversion client setups and for multithreaded storage engines.
thread_local uint64_t threadId = 0;
uint64_t getTraceThreadId() {
while (threadId == 0) {
threadId = deterministicRandom()->randomUInt64();
}
return threadId;
}
void BaseTraceEvent::setThreadId() {
this->detail("ThreadID", getTraceThreadId());
}
int BaseTraceEvent::getMaxFieldLength() const {
return maxFieldLength;
}
BaseTraceEvent& BaseTraceEvent::setMaxEventLength(int maxEventLength) {
ASSERT(!logged);
if (maxEventLength == 0) {
this->maxEventLength = FLOW_KNOBS ? FLOW_KNOBS->MAX_TRACE_EVENT_LENGTH : 4000;
} else {
this->maxEventLength = maxEventLength;
}
return *this;
}
int BaseTraceEvent::getMaxEventLength() const {
return maxEventLength;
}
BaseTraceEvent& BaseTraceEvent::GetLastError() {
#ifdef _WIN32
return detailf("WinErrorCode", "%x", ::GetLastError());
#elif defined(__unixish__)
return detailf("UnixErrorCode", "%x", errno).detail("UnixError", strerror(errno));
#endif
}
unsigned long BaseTraceEvent::eventCounts[NUM_MAJOR_LEVELS_OF_EVENTS] = { 0, 0, 0, 0, 0 };
unsigned long BaseTraceEvent::CountEventsLoggedAt(Severity sev) {
ASSERT(sev <= SevMaxUsed);
return TraceEvent::eventCounts[sev / 10];
}
BaseTraceEvent& BaseTraceEvent::backtrace(const std::string& prefix) {
ASSERT(!logged);
if (this->severity == SevError || !enabled)
return *this; // We'll backtrace this later in ~TraceEvent
return detail(prefix + "Backtrace", platform::get_backtrace());
}
void BaseTraceEvent::log() {
if (!logged) {
init();
++g_allocation_tracing_disabled;
try {
if (enabled) {
double time = TraceEvent::getCurrentTime();
fields.mutate(timeIndex).second = format("%.6f", time);
if (FLOW_KNOBS && FLOW_KNOBS->TRACE_DATETIME_ENABLED) {
fields.mutate(timeIndex + 1).second = TraceEvent::printRealTime(time);
}
setThreadId();
if (this->severity == SevError) {
severity = SevInfo;
backtrace();
severity = SevError;
if (errorKindIndex != -1) {
fields.mutate(errorKindIndex).second = toString(errorKind);
}
}
if (isNetworkThread()) {
TraceEvent::eventCounts[severity / 10]++;
}
g_traceLog.writeEvent(fields, trackingKey, severity > SevWarnAlways);
if (g_traceLog.isOpen()) {
// Log Metrics
if (g_traceLog.logTraceEventMetrics && isNetworkThread()) {
// Get the persistent Event Metric representing this trace event and push the fields (details)
// accumulated in *this to it and then log() it. Note that if the event metric is disabled it
// won't actually be logged BUT any new fields added to it will be registered. If the event IS
// logged, a timestamp will be returned, if not then 0. Either way, pass it through to be used
// if possible in the Sev* event metrics.
uint64_t event_ts =
DynamicEventMetric::getOrCreateInstance(format("TraceEvent.%s", type), StringRef(), true)
->setFieldsAndLogFrom(tmpEventMetric.get());
g_traceLog.log(severity, type, id, event_ts);
}
}
}
} catch (Error& e) {
TraceEvent(SevError, "TraceEventLoggingError").errorUnsuppressed(e);
}
tmpEventMetric.reset();
logged = true;
--g_allocation_tracing_disabled;
}
}
BaseTraceEvent::~BaseTraceEvent() {
log();
if (failedLineOverflow == 1) {
failedLineOverflow = 2;
TraceEvent(SevError, "TracedTooManyLines").log();
crashAndDie();
}
}
thread_local bool BaseTraceEvent::networkThread = false;
void BaseTraceEvent::setNetworkThread() {
if (!networkThread) {
if (FLOW_KNOBS->ALLOCATION_TRACING_ENABLED) {
--g_allocation_tracing_disabled;
}
traceEventThrottlerCache = new TransientThresholdMetricSample<Standalone<StringRef>>(
FLOW_KNOBS->TRACE_EVENT_METRIC_UNITS_PER_SAMPLE, FLOW_KNOBS->TRACE_EVENT_THROTTLER_MSG_LIMIT);
networkThread = true;
}
}
bool BaseTraceEvent::isNetworkThread() {
return networkThread;
}
double BaseTraceEvent::getCurrentTime() {
if (g_trace_clock.load() == TRACE_CLOCK_NOW) {
if (!isNetworkThread() || !g_network) {
return timer_monotonic();
} else {
return now();
}
} else {
return timer();
}
}
// converts the given flow time into a string
// with format: %Y-%m-%dT%H:%M:%S
// This only has second-resolution for the simple reason
// that std::put_time does not support higher resolution.
// This is fine since we always log the flow time as well.
std::string BaseTraceEvent::printRealTime(double time) {
using Clock = std::chrono::system_clock;
time_t ts = Clock::to_time_t(Clock::time_point(
std::chrono::duration_cast<Clock::duration>(std::chrono::duration<double, std::ratio<1>>(time))));
if (g_network && g_network->isSimulated()) {
// The clock is simulated, so return the real time
ts = Clock::to_time_t(Clock::now());
}
std::stringstream ss;
#ifdef _WIN32
// MSVC gmtime is threadsafe
ss << std::put_time(::gmtime(&ts), "%Y-%m-%dT%H:%M:%SZ");
#else
// use threadsafe gmt
struct tm result;
ss << std::put_time(::gmtime_r(&ts, &result), "%Y-%m-%dT%H:%M:%SZ");
#endif
return ss.str();
}
TraceInterval& TraceInterval::begin() {
pairID = nondeterministicRandom()->randomUniqueID();
count = 0;
return *this;
}
bool TraceBatch::dumpImmediately() {
return (g_network->isSimulated() || FLOW_KNOBS->AUTOMATIC_TRACE_DUMP);
}
void TraceBatch::addEvent(const char* name, uint64_t id, const char* location) {
if (FLOW_KNOBS->MIN_TRACE_SEVERITY > TRACE_BATCH_IMPLICIT_SEVERITY) {
return;
}
auto& eventInfo = eventBatch.emplace_back(EventInfo(TraceEvent::getCurrentTime(), name, id, location));
if (dumpImmediately())
dump();
else
g_traceLog.annotateEvent(eventInfo.fields);
}
void TraceBatch::addAttach(const char* name, uint64_t id, uint64_t to) {
if (FLOW_KNOBS->MIN_TRACE_SEVERITY > TRACE_BATCH_IMPLICIT_SEVERITY) {
return;
}
auto& attachInfo = attachBatch.emplace_back(AttachInfo(TraceEvent::getCurrentTime(), name, id, to));
if (dumpImmediately())
dump();
else
g_traceLog.annotateEvent(attachInfo.fields);
}
void TraceBatch::addBuggify(int activated, int line, std::string file) {
if (FLOW_KNOBS->MIN_TRACE_SEVERITY > TRACE_BATCH_IMPLICIT_SEVERITY) {
return;
}
if (g_network) {
auto& buggifyInfo = buggifyBatch.emplace_back(BuggifyInfo(TraceEvent::getCurrentTime(), activated, line, file));
if (dumpImmediately())
dump();
else
g_traceLog.annotateEvent(buggifyInfo.fields);
} else {
buggifyBatch.push_back(BuggifyInfo(0, activated, line, file));
}
}
void TraceBatch::dump() {
if (!g_traceLog.isOpen() || FLOW_KNOBS->MIN_TRACE_SEVERITY > TRACE_BATCH_IMPLICIT_SEVERITY)
return;
std::string machine;
if (g_network->isSimulated()) {
NetworkAddress local = g_network->getLocalAddress();
machine = formatIpPort(local.ip, local.port);
}
for (int i = 0; i < attachBatch.size(); i++) {
if (g_network->isSimulated()) {
attachBatch[i].fields.addField("Machine", machine);
}
g_traceLog.writeEvent(attachBatch[i].fields, "", false);
}
for (int i = 0; i < eventBatch.size(); i++) {
if (g_network->isSimulated()) {
eventBatch[i].fields.addField("Machine", machine);
}
g_traceLog.writeEvent(eventBatch[i].fields, "", false);
}
for (int i = 0; i < buggifyBatch.size(); i++) {
if (g_network->isSimulated()) {
buggifyBatch[i].fields.addField("Machine", machine);
}
g_traceLog.writeEvent(buggifyBatch[i].fields, "", false);
}
onMainThreadVoid([]() { g_traceLog.flush(); });
eventBatch.clear();
attachBatch.clear();
buggifyBatch.clear();
}
TraceBatch::EventInfo::EventInfo(double time, const char* name, uint64_t id, const char* location) {
fields.addField("Severity", format("%d", (int)TRACE_BATCH_IMPLICIT_SEVERITY));
fields.addField("Time", format("%.6f", time));
if (FLOW_KNOBS && FLOW_KNOBS->TRACE_DATETIME_ENABLED) {
fields.addField("DateTime", TraceEvent::printRealTime(time));
}
fields.addField("Type", name);
fields.addField("ID", format("%016" PRIx64, id));
fields.addField("Location", location);
}
TraceBatch::AttachInfo::AttachInfo(double time, const char* name, uint64_t id, uint64_t to) {
fields.addField("Severity", format("%d", (int)TRACE_BATCH_IMPLICIT_SEVERITY));
fields.addField("Time", format("%.6f", time));
if (FLOW_KNOBS && FLOW_KNOBS->TRACE_DATETIME_ENABLED) {
fields.addField("DateTime", TraceEvent::printRealTime(time));
}
fields.addField("Type", name);
fields.addField("ID", format("%016" PRIx64, id));
fields.addField("To", format("%016" PRIx64, to));
}
TraceBatch::BuggifyInfo::BuggifyInfo(double time, int activated, int line, std::string file) {
fields.addField("Severity", format("%d", (int)TRACE_BATCH_IMPLICIT_SEVERITY));
fields.addField("Time", format("%.6f", time));
if (FLOW_KNOBS && FLOW_KNOBS->TRACE_DATETIME_ENABLED) {
fields.addField("DateTime", TraceEvent::printRealTime(time));
}
fields.addField("Type", "BuggifySection");
fields.addField("Activated", format("%d", activated));
fields.addField("File", std::move(file));
fields.addField("Line", format("%d", line));
}
TraceEventFields::TraceEventFields() : bytes(0), annotated(false) {}
void TraceEventFields::addField(const std::string& key, const std::string& value) {
bytes += key.size() + value.size();
fields.emplace_back(key, value);
}
void TraceEventFields::addField(std::string&& key, std::string&& value) {
bytes += key.size() + value.size();
fields.emplace_back(std::move(key), std::move(value));
}
size_t TraceEventFields::size() const {
return fields.size();
}
size_t TraceEventFields::sizeBytes() const {
return bytes;
}
TraceEventFields::FieldIterator TraceEventFields::begin() const {
return fields.cbegin();
}
TraceEventFields::FieldIterator TraceEventFields::end() const {
return fields.cend();
}
bool TraceEventFields::isAnnotated() const {
return annotated;
}
void TraceEventFields::setAnnotated() {
annotated = true;
}
const TraceEventFields::Field& TraceEventFields::operator[](int index) const {
ASSERT(index >= 0 && index < size());
return fields.at(index);
}
bool TraceEventFields::tryGetValue(std::string key, std::string& outValue) const {
for (auto itr = begin(); itr != end(); ++itr) {
if (itr->first == key) {
outValue = itr->second;
return true;
}
}
return false;
}
std::string TraceEventFields::getValue(std::string key) const {
std::string value;
if (tryGetValue(key, value)) {
return value;
} else {
TraceEvent ev(SevWarn, "TraceEventFieldNotFound");
ev.suppressFor(1.0);
if (tryGetValue("Type", value)) {
ev.detail("Event", value);
}
ev.detail("FieldName", key);
throw attribute_not_found();
}
}
TraceEventFields::Field& TraceEventFields::mutate(int index) {
return fields.at(index);
}
namespace {
void parseNumericValue(std::string const& s, double& outValue, bool permissive = false) {
double d = 0;
int consumed = 0;
int r = sscanf(s.c_str(), "%lf%n", &d, &consumed);
if (r == 1 && (consumed == s.size() || permissive)) {
outValue = d;
return;
}
throw attribute_not_found();
}
void parseNumericValue(std::string const& s, int& outValue, bool permissive = false) {
long long int iLong = 0;
int consumed = 0;
int r = sscanf(s.c_str(), "%lld%n", &iLong, &consumed);
if (r == 1 && (consumed == s.size() || permissive)) {
if (std::numeric_limits<int>::min() <= iLong && iLong <= std::numeric_limits<int>::max()) {
outValue = (int)iLong; // Downcast definitely safe
return;
} else {
throw attribute_too_large();
}
}
throw attribute_not_found();
}
void parseNumericValue(std::string const& s, int64_t& outValue, bool permissive = false) {
long long int i = 0;
int consumed = 0;
int r = sscanf(s.c_str(), "%lld%n", &i, &consumed);
if (r == 1 && (consumed == s.size() || permissive)) {
outValue = i;
return;
}
throw attribute_not_found();
}
void parseNumericValue(std::string const& s, uint64_t& outValue, bool permissive = false) {
unsigned long long int i = 0;
int consumed = 0;
int r = sscanf(s.c_str(), "%llu%n", &i, &consumed);
if (r == 1 && (consumed == s.size() || permissive)) {
outValue = i;
return;
}
throw attribute_not_found();
}
template <class T>
T getNumericValue(TraceEventFields const& fields, std::string key, bool permissive) {
std::string field = fields.getValue(key);
try {
T value;
parseNumericValue(field, value, permissive);
return value;
} catch (Error& e) {
std::string type;
TraceEvent ev(SevWarn, "ErrorParsingNumericTraceEventField");
ev.error(e);
if (fields.tryGetValue("Type", type)) {
ev.detail("Event", type);
}
ev.detail("FieldName", key);
ev.detail("FieldValue", field);
throw;
}
}
} // namespace
int TraceEventFields::getInt(std::string key, bool permissive) const {
return getNumericValue<int>(*this, key, permissive);
}
int64_t TraceEventFields::getInt64(std::string key, bool permissive) const {
return getNumericValue<int64_t>(*this, key, permissive);
}
uint64_t TraceEventFields::getUint64(std::string key, bool permissive) const {
return getNumericValue<uint64_t>(*this, key, permissive);
}
double TraceEventFields::getDouble(std::string key, bool permissive) const {
return getNumericValue<double>(*this, key, permissive);
}
std::string TraceEventFields::toString() const {
std::string str;
bool first = true;
for (auto itr = begin(); itr != end(); ++itr) {
if (!first) {
str += ", ";
}
first = false;
str += format("\"%s\"=\"%s\"", itr->first.c_str(), itr->second.c_str());
}
return str;
}
bool validateField(const char* key, bool allowUnderscores) {
if ((key[0] < 'A' || key[0] > 'Z') && key[0] != '_') {
return false;
}
const char* underscore = strchr(key, '_');
while (underscore) {
if (!allowUnderscores || ((underscore[1] < 'A' || underscore[1] > 'Z') && key[0] != '_' && key[0] != '\0')) {
return false;
}
underscore = strchr(&underscore[1], '_');
}
return true;
}
void TraceEventFields::validateFormat() const {
if (g_network && g_network->isSimulated()) {
for (Field field : fields) {
if (!validateField(field.first.c_str(), false)) {
fprintf(stderr,
"Trace event detail name `%s' is invalid in:\n\t%s\n",
field.first.c_str(),
toString().c_str());
}
if (field.first == "Type" && !validateField(field.second.c_str(), true)) {
fprintf(stderr, "Trace event detail Type `%s' is invalid\n", field.second.c_str());
}
}
}
}
std::string traceableStringToString(const char* value, size_t S) {
if (g_network) {
ASSERT_WE_THINK(S > 0 && value[S - 1] == '\0');
}
return std::string(value, S - 1); // Exclude trailing \0 byte
}
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