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gecko-dev/xpcom/base/Logging.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Logging.h"
#include <algorithm>
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/FileUtils.h"
#include "mozilla/Mutex.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Printf.h"
#include "mozilla/Atomics.h"
#include "mozilla/Sprintf.h"
#include "mozilla/UniquePtrExtensions.h"
#include "MainThreadUtils.h"
#include "nsClassHashtable.h"
#include "nsDebug.h"
#include "nsDebugImpl.h"
#include "NSPRLogModulesParser.h"
#include "LogCommandLineHandler.h"
#ifdef MOZ_GECKO_PROFILER
# include "ProfilerMarkerPayload.h"
#endif
#include "prenv.h"
#ifdef XP_WIN
# include <process.h>
#else
# include <sys/types.h>
# include <unistd.h>
#endif
// NB: Initial amount determined by auditing the codebase for the total amount
// of unique module names and padding up to the next power of 2.
const uint32_t kInitialModuleCount = 256;
// When rotate option is added to the modules list, this is the hardcoded
// number of files we create and rotate. When there is rotate:40,
// we will keep four files per process, each limited to 10MB. Sum is 40MB,
// the given limit.
//
// (Note: When this is changed to be >= 10, SandboxBroker::LaunchApp must add
// another rule to allow logfile.?? be written by content processes.)
const uint32_t kRotateFilesNumber = 4;
namespace mozilla {
namespace detail {
void log_print(const LogModule* aModule, LogLevel aLevel, const char* aFmt,
...) {
va_list ap;
va_start(ap, aFmt);
aModule->Printv(aLevel, aFmt, ap);
va_end(ap);
}
} // namespace detail
LogLevel ToLogLevel(int32_t aLevel) {
aLevel = std::min(aLevel, static_cast<int32_t>(LogLevel::Verbose));
aLevel = std::max(aLevel, static_cast<int32_t>(LogLevel::Disabled));
return static_cast<LogLevel>(aLevel);
}
static const char* ToLogStr(LogLevel aLevel) {
switch (aLevel) {
case LogLevel::Error:
return "E";
case LogLevel::Warning:
return "W";
case LogLevel::Info:
return "I";
case LogLevel::Debug:
return "D";
case LogLevel::Verbose:
return "V";
case LogLevel::Disabled:
default:
MOZ_CRASH("Invalid log level.");
return "";
}
}
namespace detail {
/**
* A helper class providing reference counting for FILE*.
* It encapsulates the following:
* - the FILE handle
* - the order number it was created for when rotating (actual path)
* - number of active references
*/
class LogFile {
FILE* mFile;
uint32_t mFileNum;
public:
LogFile(FILE* aFile, uint32_t aFileNum)
: mFile(aFile), mFileNum(aFileNum), mNextToRelease(nullptr) {}
~LogFile() {
fclose(mFile);
delete mNextToRelease;
}
FILE* File() const { return mFile; }
uint32_t Num() const { return mFileNum; }
LogFile* mNextToRelease;
};
static const char* ExpandPIDMarker(const char* aFilename,
char (&buffer)[2048]) {
MOZ_ASSERT(aFilename);
static const char kPIDToken[] = "%PID";
const char* pidTokenPtr = strstr(aFilename, kPIDToken);
if (pidTokenPtr &&
SprintfLiteral(
buffer, "%.*s%s%d%s", static_cast<int>(pidTokenPtr - aFilename),
aFilename, XRE_IsParentProcess() ? "-main." : "-child.",
base::GetCurrentProcId(), pidTokenPtr + strlen(kPIDToken)) > 0) {
return buffer;
}
return aFilename;
}
} // namespace detail
namespace {
// Helper method that initializes an empty va_list to be empty.
void empty_va(va_list* va, ...) {
va_start(*va, va);
va_end(*va);
}
} // namespace
class LogModuleManager {
public:
LogModuleManager()
// As for logging atomics, don't preserve behavior for this lock when
// recording/replaying.
: mModulesLock("logmodules", recordreplay::Behavior::DontPreserve),
mModules(kInitialModuleCount),
mPrintEntryCount(0),
mOutFile(nullptr),
mToReleaseFile(nullptr),
mOutFileNum(0),
mOutFilePath(strdup("")),
mMainThread(PR_GetCurrentThread()),
mSetFromEnv(false),
mAddTimestamp(false),
mAddProfilerMarker(false),
mIsRaw(false),
mIsSync(false),
mRotate(0),
mInitialized(false) {}
~LogModuleManager() {
detail::LogFile* logFile = mOutFile.exchange(nullptr);
delete logFile;
}
/**
* Loads config from command line args or env vars if present, in
* this specific order of priority.
*
* Notes:
*
* 1) This function is only intended to be called once per session.
* 2) None of the functions used in Init should rely on logging.
*/
void Init(int argc, char* argv[]) {
MOZ_DIAGNOSTIC_ASSERT(!mInitialized);
mInitialized = true;
LoggingHandleCommandLineArgs(argc, static_cast<char const* const*>(argv),
[](nsACString const& env) {
// We deliberately set/rewrite the
// environment variables so that when child
// processes are spawned w/o passing the
// arguments they still inherit the logging
// settings as well as sandboxing can be
// correctly set. Scripts can pass
// -MOZ_LOG=$MOZ_LOG,modules as an argument
// to merge existing settings, if required.
// PR_SetEnv takes ownership of the string.
PR_SetEnv(ToNewCString(env));
});
bool shouldAppend = false;
bool addTimestamp = false;
bool isSync = false;
bool isRaw = false;
bool isMarkers = false;
int32_t rotate = 0;
const char* modules = PR_GetEnv("MOZ_LOG");
if (!modules || !modules[0]) {
modules = PR_GetEnv("MOZ_LOG_MODULES");
if (modules) {
NS_WARNING(
"MOZ_LOG_MODULES is deprecated."
"\nPlease use MOZ_LOG instead.");
}
}
if (!modules || !modules[0]) {
modules = PR_GetEnv("NSPR_LOG_MODULES");
if (modules) {
NS_WARNING(
"NSPR_LOG_MODULES is deprecated."
"\nPlease use MOZ_LOG instead.");
}
}
// Need to capture `this` since `sLogModuleManager` is not set until after
// initialization is complete.
NSPRLogModulesParser(
modules, [this, &shouldAppend, &addTimestamp, &isSync, &isRaw, &rotate,
&isMarkers](const char* aName, LogLevel aLevel,
int32_t aValue) mutable {
if (strcmp(aName, "append") == 0) {
shouldAppend = true;
} else if (strcmp(aName, "timestamp") == 0) {
addTimestamp = true;
} else if (strcmp(aName, "sync") == 0) {
isSync = true;
} else if (strcmp(aName, "raw") == 0) {
isRaw = true;
} else if (strcmp(aName, "rotate") == 0) {
rotate = (aValue << 20) / kRotateFilesNumber;
} else if (strcmp(aName, "profilermarkers") == 0) {
isMarkers = true;
} else {
this->CreateOrGetModule(aName)->SetLevel(aLevel);
}
});
// Rotate implies timestamp to make the files readable
mAddTimestamp = addTimestamp || rotate > 0;
mIsSync = isSync;
mIsRaw = isRaw;
mRotate = rotate;
mAddProfilerMarker = isMarkers;
if (rotate > 0 && shouldAppend) {
NS_WARNING("MOZ_LOG: when you rotate the log, you cannot use append!");
}
const char* logFile = PR_GetEnv("MOZ_LOG_FILE");
if (!logFile || !logFile[0]) {
logFile = PR_GetEnv("NSPR_LOG_FILE");
}
if (logFile && logFile[0]) {
char buf[2048];
logFile = detail::ExpandPIDMarker(logFile, buf);
mOutFilePath.reset(strdup(logFile));
if (mRotate > 0) {
// Delete all the previously captured files, including non-rotated
// log files, so that users don't complain our logs eat space even
// after the rotate option has been added and don't happen to send
// us old large logs along with the rotated files.
remove(mOutFilePath.get());
for (uint32_t i = 0; i < kRotateFilesNumber; ++i) {
RemoveFile(i);
}
}
mOutFile = OpenFile(shouldAppend, mOutFileNum);
mSetFromEnv = true;
}
}
void SetLogFile(const char* aFilename) {
// For now we don't allow you to change the file at runtime.
if (mSetFromEnv) {
NS_WARNING(
"LogModuleManager::SetLogFile - Log file was set from the "
"MOZ_LOG_FILE environment variable.");
return;
}
const char* filename = aFilename ? aFilename : "";
char buf[2048];
filename = detail::ExpandPIDMarker(filename, buf);
// Can't use rotate at runtime yet.
MOZ_ASSERT(mRotate == 0,
"We don't allow rotate for runtime logfile changes");
mOutFilePath.reset(strdup(filename));
// Exchange mOutFile and set it to be released once all the writes are done.
detail::LogFile* newFile = OpenFile(false, 0);
detail::LogFile* oldFile = mOutFile.exchange(newFile);
// Since we don't allow changing the logfile if MOZ_LOG_FILE is already set,
// and we don't allow log rotation when setting it at runtime,
// mToReleaseFile will be null, so we're not leaking.
DebugOnly<detail::LogFile*> prevFile = mToReleaseFile.exchange(oldFile);
MOZ_ASSERT(!prevFile, "Should be null because rotation is not allowed");
// If we just need to release a file, we must force print, in order to
// trigger the closing and release of mToReleaseFile.
if (oldFile) {
va_list va;
empty_va(&va);
Print("Logger", LogLevel::Info, "Flushing old log files\n", va);
}
}
uint32_t GetLogFile(char* aBuffer, size_t aLength) {
uint32_t len = strlen(mOutFilePath.get());
if (len + 1 > aLength) {
return 0;
}
snprintf(aBuffer, aLength, "%s", mOutFilePath.get());
return len;
}
void SetIsSync(bool aIsSync) { mIsSync = aIsSync; }
void SetAddTimestamp(bool aAddTimestamp) { mAddTimestamp = aAddTimestamp; }
detail::LogFile* OpenFile(bool aShouldAppend, uint32_t aFileNum) {
FILE* file;
if (mRotate > 0) {
char buf[2048];
SprintfLiteral(buf, "%s.%d", mOutFilePath.get(), aFileNum);
// rotate doesn't support append.
file = fopen(buf, "w");
} else {
file = fopen(mOutFilePath.get(), aShouldAppend ? "a" : "w");
}
if (!file) {
return nullptr;
}
return new detail::LogFile(file, aFileNum);
}
void RemoveFile(uint32_t aFileNum) {
char buf[2048];
SprintfLiteral(buf, "%s.%d", mOutFilePath.get(), aFileNum);
remove(buf);
}
LogModule* CreateOrGetModule(const char* aName) {
OffTheBooksMutexAutoLock guard(mModulesLock);
LogModule* module = nullptr;
if (!mModules.Get(aName, &module)) {
module = new LogModule(aName, LogLevel::Disabled);
mModules.Put(aName, module);
}
return module;
}
void Print(const char* aName, LogLevel aLevel, const char* aFmt,
va_list aArgs) MOZ_FORMAT_PRINTF(4, 0) {
// We don't do nuwa-style forking anymore, so our pid can't change.
static long pid = static_cast<long>(base::GetCurrentProcId());
const size_t kBuffSize = 1024;
char buff[kBuffSize];
char* buffToWrite = buff;
SmprintfPointer allocatedBuff;
va_list argsCopy;
va_copy(argsCopy, aArgs);
int charsWritten = VsprintfLiteral(buff, aFmt, argsCopy);
va_end(argsCopy);
if (charsWritten < 0) {
// Print out at least something. We must copy to the local buff,
// can't just assign aFmt to buffToWrite, since when
// buffToWrite != buff, we try to release it.
MOZ_ASSERT(false, "Probably incorrect format string in LOG?");
strncpy(buff, aFmt, kBuffSize - 1);
buff[kBuffSize - 1] = '\0';
charsWritten = strlen(buff);
} else if (static_cast<size_t>(charsWritten) >= kBuffSize - 1) {
// We may have maxed out, allocate a buffer instead.
allocatedBuff = mozilla::Vsmprintf(aFmt, aArgs);
buffToWrite = allocatedBuff.get();
charsWritten = strlen(buffToWrite);
}
#ifdef MOZ_GECKO_PROFILER
if (mAddProfilerMarker && profiler_is_active()) {
profiler_add_marker(
"LogMessages", JS::ProfilingCategoryPair::OTHER,
MakeUnique<LogMarkerPayload>(aName, buffToWrite, TimeStamp::Now()));
}
#endif
// Determine if a newline needs to be appended to the message.
const char* newline = "";
if (charsWritten == 0 || buffToWrite[charsWritten - 1] != '\n') {
newline = "\n";
}
FILE* out = stderr;
// In case we use rotate, this ensures the FILE is kept alive during
// its use. Increased before we load mOutFile.
++mPrintEntryCount;
detail::LogFile* outFile = mOutFile;
if (outFile) {
out = outFile->File();
}
// This differs from the NSPR format in that we do not output the
// opaque system specific thread pointer (ie pthread_t) cast
// to a long. The address of the current PR_Thread continues to be
// prefixed.
//
// Additionally we prefix the output with the abbreviated log level
// and the module name.
PRThread* currentThread = PR_GetCurrentThread();
const char* currentThreadName = (mMainThread == currentThread)
? "Main Thread"
: PR_GetThreadName(currentThread);
char noNameThread[40];
if (!currentThreadName) {
SprintfLiteral(noNameThread, "Unnamed thread %p", currentThread);
currentThreadName = noNameThread;
}
if (!mAddTimestamp) {
if (!mIsRaw) {
fprintf_stderr(out, "[%s %ld: %s]: %s/%s %s%s",
nsDebugImpl::GetMultiprocessMode(), pid,
currentThreadName, ToLogStr(aLevel), aName, buffToWrite,
newline);
} else {
fprintf_stderr(out, "%s%s", buffToWrite, newline);
}
} else {
PRExplodedTime now;
PR_ExplodeTime(PR_Now(), PR_GMTParameters, &now);
fprintf_stderr(
out,
"%04d-%02d-%02d %02d:%02d:%02d.%06d UTC - [%s %ld: %s]: %s/%s %s%s",
now.tm_year, now.tm_month + 1, now.tm_mday, now.tm_hour, now.tm_min,
now.tm_sec, now.tm_usec, nsDebugImpl::GetMultiprocessMode(), pid,
currentThreadName, ToLogStr(aLevel), aName, buffToWrite, newline);
}
if (mIsSync) {
fflush(out);
}
if (mRotate > 0 && outFile) {
int32_t fileSize = ftell(out);
if (fileSize > mRotate) {
uint32_t fileNum = outFile->Num();
uint32_t nextFileNum = fileNum + 1;
if (nextFileNum >= kRotateFilesNumber) {
nextFileNum = 0;
}
// And here is the trick. The current out-file remembers its order
// number. When no other thread shifted the global file number yet,
// we are the thread to open the next file.
if (mOutFileNum.compareExchange(fileNum, nextFileNum)) {
// We can work with mToReleaseFile because we are sure the
// mPrintEntryCount can't drop to zero now - the condition
// to actually delete what's stored in that member.
// And also, no other thread can enter this piece of code
// because mOutFile is still holding the current file with
// the non-shifted number. The compareExchange() above is
// a no-op for other threads.
outFile->mNextToRelease = mToReleaseFile;
mToReleaseFile = outFile;
mOutFile = OpenFile(false, nextFileNum);
}
}
}
if (--mPrintEntryCount == 0 && mToReleaseFile) {
// We were the last Print() entered, if there is a file to release
// do it now. exchange() is atomic and makes sure we release the file
// only once on one thread.
detail::LogFile* release = mToReleaseFile.exchange(nullptr);
delete release;
}
}
private:
OffTheBooksMutex mModulesLock;
nsClassHashtable<nsCharPtrHashKey, LogModule> mModules;
// Print() entry counter, actually reflects concurrent use of the current
// output file. ReleaseAcquire ensures that manipulation with mOutFile
// and mToReleaseFile is synchronized by manipulation with this value.
Atomic<uint32_t, ReleaseAcquire> mPrintEntryCount;
// File to write to. ReleaseAcquire because we need to sync mToReleaseFile
// with this.
Atomic<detail::LogFile*, ReleaseAcquire> mOutFile;
// File to be released when reference counter drops to zero. This member
// is assigned mOutFile when the current file has reached the limit.
// It can be Relaxed, since it's synchronized with mPrintEntryCount
// manipulation and we do atomic exchange() on it.
Atomic<detail::LogFile*, Relaxed> mToReleaseFile;
// The next file number. This is mostly only for synchronization sake.
// Can have relaxed ordering, since we only do compareExchange on it which
// is atomic regardless ordering.
Atomic<uint32_t, Relaxed> mOutFileNum;
// Just keeps the actual file path for further use.
UniqueFreePtr<char[]> mOutFilePath;
PRThread* mMainThread;
bool mSetFromEnv;
Atomic<bool, Relaxed> mAddTimestamp;
Atomic<bool, Relaxed> mAddProfilerMarker;
Atomic<bool, Relaxed> mIsRaw;
Atomic<bool, Relaxed> mIsSync;
int32_t mRotate;
bool mInitialized;
};
StaticAutoPtr<LogModuleManager> sLogModuleManager;
LogModule* LogModule::Get(const char* aName) {
// This is just a pass through to the LogModuleManager so
// that the LogModuleManager implementation can be kept internal.
MOZ_ASSERT(sLogModuleManager != nullptr);
return sLogModuleManager->CreateOrGetModule(aName);
}
void LogModule::SetLogFile(const char* aFilename) {
MOZ_ASSERT(sLogModuleManager);
sLogModuleManager->SetLogFile(aFilename);
}
uint32_t LogModule::GetLogFile(char* aBuffer, size_t aLength) {
MOZ_ASSERT(sLogModuleManager);
return sLogModuleManager->GetLogFile(aBuffer, aLength);
}
void LogModule::SetAddTimestamp(bool aAddTimestamp) {
sLogModuleManager->SetAddTimestamp(aAddTimestamp);
}
void LogModule::SetIsSync(bool aIsSync) {
sLogModuleManager->SetIsSync(aIsSync);
}
void LogModule::Init(int argc, char* argv[]) {
// NB: This method is not threadsafe; it is expected to be called very early
// in startup prior to any other threads being run.
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
if (sLogModuleManager) {
// Already initialized.
return;
}
// NB: We intentionally do not register for ClearOnShutdown as that happens
// before all logging is complete. And, yes, that means we leak, but
// we're doing that intentionally.
// Don't assign the pointer until after Init is called. This should help us
// detect if any of the functions called by Init somehow rely on logging.
auto mgr = new LogModuleManager();
mgr->Init(argc, argv);
sLogModuleManager = mgr;
}
void LogModule::Printv(LogLevel aLevel, const char* aFmt, va_list aArgs) const {
MOZ_ASSERT(sLogModuleManager != nullptr);
// Forward to LogModule manager w/ level and name
sLogModuleManager->Print(Name(), aLevel, aFmt, aArgs);
}
} // namespace mozilla
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