std::string getXlogCategoryNameForFile(StringPiece filename) {
// Buck mangles the directory layout for header files. Rather than including
// them from their original location, it moves them into deep directories
// inside buck-out, and includes them from there.
//
// If this path looks like a buck header directory, try to strip off the
// buck-specific portion.
if (filename.startsWith("buck-out/")) {
filename = stripBuckOutPrefix(filename);
}
std::string categoryName = filename.str();
// Translate slashes to dots, to turn the directory layout into
// a category hierarchy.
size_t lastDot = std::string::npos;
for (size_t n = 0; n < categoryName.size(); ++n) {
if (categoryName[n] == '/') {
categoryName[n] = '.';
lastDot = std::string::npos;
} else if (categoryName[n] == '.') {
lastDot = n;
}
}
// Strip off the filename extension, if one was present.
if (lastDot != std::string::npos) {
categoryName.resize(lastDot);
}
return categoryName;
}
static StringPiece pathBasename(StringPiece path) {
auto idx = path.rfind('/');
if (idx == StringPiece::npos) {
return path.str();
}
return path.subpiece(idx + 1);
}
std::shared_ptr<ElfFile> ElfCache::getFile(StringPiece p) {
auto path = p.str();
std::lock_guard<std::mutex> lock(mutex_);
auto pos = files_.find(path);
if (pos != files_.end()) {
// Found, move to back (MRU)
auto& entry = pos->second;
lruList_.erase(lruList_.iterator_to(*entry));
lruList_.push_back(*entry);
return filePtr(entry);
}
auto entry = std::make_shared<Entry>();
// No negative caching
if (entry->file.openNoThrow(path.c_str()) == -1) {
return nullptr;
}
if (files_.size() == capacity_) {
// Evict LRU
lruList_.pop_front();
}
files_.emplace(std::move(path), entry);
lruList_.push_back(*entry);
return filePtr(entry);
}
std::shared_ptr<ElfFile> ElfCache::getFile(StringPiece p) {
std::lock_guard<std::mutex> lock(mutex_);
auto pos = files_.find(p);
if (pos != files_.end()) {
// Found, move to back (MRU)
auto& entry = pos->second;
lruList_.erase(lruList_.iterator_to(*entry));
lruList_.push_back(*entry);
return filePtr(entry);
}
auto entry = std::make_shared<Entry>();
entry->path = p.str();
auto& path = entry->path;
// No negative caching
const char* msg = "";
int r = entry->file.openNoThrow(path.c_str(), true, &msg);
if (r != ElfFile::kSuccess) {
return nullptr;
}
if (files_.size() == capacity_) {
auto& e = lruList_.front();
lruList_.pop_front();
files_.erase(e.path);
}
files_.emplace(entry->path, entry);
lruList_.push_back(*entry);
return filePtr(entry);
}
RocksHandles::RocksHandles(
StringPiece dbPath,
const Options& options,
const std::vector<ColumnFamilyDescriptor>& columnDescriptors) {
auto dbPathStr = dbPath.str();
DB* dbRaw;
std::vector<ColumnFamilyHandle*> columnHandles;
// This will create any newly defined column families automatically,
// so we needn't make any special migration steps here; just define
// a new family and start to use it.
// If we remove column families in the future this call will fail
// and shout at us for not opening up the database with them defined.
// We will need to do "something smarter" if we ever decide to perform
// that kind of a migration.
auto status =
DB::Open(options, dbPathStr, columnDescriptors, &columnHandles, &dbRaw);
if (!status.ok()) {
XLOG(ERR) << "Error opening RocksDB storage at " << dbPathStr << ": "
<< status.ToString();
throw RocksException::build(
status, "error opening RocksDB storage at", dbPathStr);
}
db.reset(dbRaw);
columns.reserve(columnHandles.size());
for (auto h : columnHandles) {
columns.emplace_back(h);
}
}
// public string constructor
IPAddressV6::IPAddressV6(StringPiece addr) {
auto ip = addr.str();
// Allow addresses surrounded in brackets
if (ip.size() < 2) {
throw IPAddressFormatException(
to<std::string>("Invalid IPv6 address '", ip, "': address too short"));
}
if (ip.front() == '[' && ip.back() == ']') {
ip = ip.substr(1, ip.size() - 2);
}
struct addrinfo* result;
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST;
if (!getaddrinfo(ip.c_str(), nullptr, &hints, &result)) {
struct sockaddr_in6* ipAddr = (struct sockaddr_in6*)result->ai_addr;
addr_.in6Addr_ = ipAddr->sin6_addr;
scope_ = ipAddr->sin6_scope_id;
freeaddrinfo(result);
} else {
throw IPAddressFormatException(
to<std::string>("Invalid IPv6 address '", ip, "'"));
}
}
// public string constructor
IPAddressV4::IPAddressV4(StringPiece addr)
: addr_()
{
auto ip = addr.str();
if (inet_pton(AF_INET, ip.c_str(), &addr_.inAddr_) != 1) {
throw IPAddressFormatException("Invalid IPv4 address '", addr, "'");
}
}
void expect(LineReader& lr, const char* expected) {
StringPiece line;
size_t expectedLen = strlen(expected);
EXPECT_EQ(expectedLen != 0 ? LineReader::kReading : LineReader::kEof,
lr.readLine(line));
EXPECT_EQ(expectedLen, line.size());
EXPECT_EQ(std::string(expected, expectedLen), line.str());
}
// static public
uint32_t IPAddressV4::toLong(StringPiece ip) {
auto str = ip.str();
in_addr addr;
if (inet_pton(AF_INET, str.c_str(), &addr) != 1) {
throw IPAddressFormatException("Can't convert invalid IP '", ip, "' ",
"to long");
}
return addr.s_addr;
}
void FunctionScheduler::addFunction(Function<void()>&& cb,
milliseconds interval,
StringPiece nameID,
milliseconds startDelay) {
addFunctionGenericDistribution(
std::move(cb),
ConstIntervalFunctor(interval),
nameID.str(),
to<std::string>(interval.count(), "ms"),
startDelay);
}
void writeFileAtomic(
StringPiece filename,
iovec* iov,
int count,
mode_t permissions) {
auto rc = writeFileAtomicNoThrow(filename, iov, count, permissions);
if (rc != 0) {
auto msg = std::string(__func__) + "() failed to update " + filename.str();
throw std::system_error(rc, std::generic_category(), msg);
}
}
void FunctionScheduler::addFunctionUniformDistribution(
Function<void()>&& cb,
milliseconds minInterval,
milliseconds maxInterval,
StringPiece nameID,
milliseconds startDelay) {
addFunctionGenericDistribution(
std::move(cb),
UniformDistributionFunctor(minInterval, maxInterval),
nameID.str(),
to<std::string>(
"[", minInterval.count(), " , ", maxInterval.count(), "] ms"),
startDelay);
}
void PktCaptureManager::stopCapture(StringPiece name) {
std::lock_guard<std::mutex> g(mutex_);
auto nameStr = name.str();
auto it = activeCaptures_.find(nameStr);
if (it == activeCaptures_.end()) {
throw FbossError("no active capture found with name \"", name, "\"");
}
LOG(INFO) << "stopping packet capture \"" << name << "\"";
it->second->stop();
inactiveCaptures_[nameStr] = std::move(it->second);
activeCaptures_.erase(it);
capturesRunning_.store(!activeCaptures_.empty(), std::memory_order_release);
}
// public string constructor
IPAddressV6::IPAddressV6(StringPiece addr) {
auto ip = addr.str();
// Allow addresses surrounded in brackets
if (ip.size() < 2) {
throw IPAddressFormatException("Invalid IPv6 address '", ip,
"': address too short");
}
if (ip.front() == '[' && ip.back() == ']') {
ip = ip.substr(1, ip.size() - 2);
}
if (inet_pton(AF_INET6, ip.c_str(), &addr_.in6Addr_) != 1) {
throw IPAddressFormatException("Invalid IPv6 address '", ip, "'");
}
}
void FunctionScheduler::addFunction(Function<void()>&& cb,
milliseconds interval,
const LatencyDistribution& latencyDistr,
StringPiece nameID,
milliseconds startDelay) {
if (latencyDistr.isPoisson) {
addFunctionGenericDistribution(
std::move(cb),
PoissonDistributionFunctor(latencyDistr.poissonMean),
nameID.str(),
to<std::string>(latencyDistr.poissonMean, "ms (Poisson mean)"),
startDelay);
} else {
addFunction(std::move(cb), interval, nameID, startDelay);
}
}
// public string constructor
IPAddress::IPAddress(StringPiece addr)
: addr_()
, family_(AF_UNSPEC)
{
string ip = addr.str(); // inet_pton() needs NUL-terminated string
auto throwFormatException = [&](const string& msg) {
throw IPAddressFormatException(
to<std::string>("Invalid IP '", ip, "': ", msg));
};
if (ip.size() < 2) {
throwFormatException("address too short");
}
if (ip.front() == '[' && ip.back() == ']') {
ip = ip.substr(1, ip.size() - 2);
}
// need to check for V4 address second, since IPv4-mapped IPv6 addresses may
// contain a period
if (ip.find(':') != string::npos) {
struct addrinfo* result;
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST;
if (!getaddrinfo(ip.c_str(), nullptr, &hints, &result)) {
struct sockaddr_in6* ipAddr = (struct sockaddr_in6*)result->ai_addr;
addr_ = IPAddressV46(IPAddressV6(*ipAddr));
family_ = AF_INET6;
freeaddrinfo(result);
} else {
throwFormatException("getsockaddr failed for V6 address");
}
} else if (ip.find('.') != string::npos) {
in_addr ipAddr;
if (inet_pton(AF_INET, ip.c_str(), &ipAddr) != 1) {
throwFormatException("inet_pton failed for V4 address");
}
addr_ = IPAddressV46(IPAddressV4(ipAddr));
family_ = AF_INET;
} else {
throwFormatException("invalid address format");
}
}
unique_ptr<PktCapture> PktCaptureManager::forgetCapture(StringPiece name) {
std::lock_guard<std::mutex> g(mutex_);
auto nameStr = name.str();
auto activeIt = activeCaptures_.find(nameStr);
if (activeIt != activeCaptures_.end()) {
LOG(INFO) << "stopping packet capture \"" << name << "\"";
std::unique_ptr<PktCapture> capture = std::move(activeIt->second);
activeCaptures_.erase(activeIt);
capturesRunning_.store(!activeCaptures_.empty(),
std::memory_order_release);
capture->stop();
return capture;
}
auto inactiveIt = inactiveCaptures_.find(nameStr);
if (inactiveIt != inactiveCaptures_.end()) {
std::unique_ptr<PktCapture> capture = std::move(inactiveIt->second);
inactiveCaptures_.erase(inactiveIt);
return capture;
}
throw FbossError("no capture found with name \"", name, "\"");
}
void addType(StringPiece value) {
if (value == "array") {
allowedTypes_.push_back(dynamic::Type::ARRAY);
} else if (value == "boolean") {
allowedTypes_.push_back(dynamic::Type::BOOL);
} else if (value == "integer") {
allowedTypes_.push_back(dynamic::Type::INT64);
} else if (value == "number") {
allowedTypes_.push_back(dynamic::Type::INT64);
allowedTypes_.push_back(dynamic::Type::DOUBLE);
} else if (value == "null") {
allowedTypes_.push_back(dynamic::Type::NULLT);
} else if (value == "object") {
allowedTypes_.push_back(dynamic::Type::OBJECT);
} else if (value == "string") {
allowedTypes_.push_back(dynamic::Type::STRING);
} else {
return;
}
if (!typeStr_.empty()) {
typeStr_ += ", ";
}
typeStr_ += value.str();
}
void operator()(StringPiece msg, double sec) {
m = msg.str();
t = sec;
}
FormatKeyNotFoundException::FormatKeyNotFoundException(StringPiece key)
: std::out_of_range(kMessagePrefix.str() + key.str()) {}
void FunctionScheduler::setThreadName(StringPiece threadName) {
std::unique_lock<std::mutex> l(mutex_);
threadName_ = threadName.str();
}
void trailingData(StringPiece data) {
trailingData_ = data.str();
}
void AsyncFileWriter::writeMessage(StringPiece buffer, uint32_t flags) {
return writeMessage(buffer.str(), flags);
}
LogLevel stringToLogLevel(StringPiece name) {
string lowerNameStr;
lowerNameStr.reserve(name.size());
for (char c : name) {
lowerNameStr.push_back(static_cast<char>(std::tolower(c)));
}
StringPiece lowerName{lowerNameStr};
// If the string is of the form "LogLevel::foo" or "LogLevel(foo)"
// strip it down just to "foo". This makes sure we can process both
// the "LogLevel::WARN" and "LogLevel(1234)" formats produced by
// logLevelToString().
constexpr StringPiece lowercasePrefix{"loglevel::"};
constexpr StringPiece wrapperPrefix{"loglevel("};
if (lowerName.startsWith(lowercasePrefix)) {
lowerName.advance(lowercasePrefix.size());
} else if (lowerName.startsWith(wrapperPrefix) && lowerName.endsWith(")")) {
lowerName.advance(wrapperPrefix.size());
lowerName.subtract(1);
}
if (lowerName == "uninitialized") {
return LogLevel::UNINITIALIZED;
} else if (lowerName == "none") {
return LogLevel::NONE;
} else if (lowerName == "debug" || lowerName == "dbg") {
return LogLevel::DBG;
} else if (lowerName == "info") {
return LogLevel::INFO;
} else if (lowerName == "warn" || lowerName == "warning") {
return LogLevel::WARN;
} else if (lowerName == "error" || lowerName == "err") {
return LogLevel::ERR;
} else if (lowerName == "critical") {
return LogLevel::CRITICAL;
} else if (lowerName == "dfatal") {
return LogLevel::DFATAL;
} else if (lowerName == "fatal") {
return LogLevel::FATAL;
} else if (lowerName == "max" || lowerName == "max_level") {
return LogLevel::MAX_LEVEL;
}
for (const auto& info : numberedLogLevels) {
if (!lowerName.startsWith(info.lowerPrefix)) {
continue;
}
auto remainder = lowerName.subpiece(info.lowerPrefix.size());
auto level = folly::tryTo<int>(remainder).value_or(-1);
if (level < 0 ||
static_cast<unsigned int>(level) > (static_cast<uint32_t>(info.max) -
static_cast<uint32_t>(info.min))) {
throw std::range_error(to<string>(
"invalid ", info.lowerPrefix, " logger level: ", name.str()));
}
return info.max - level;
}
// Try as an plain integer if all else fails
try {
auto level = folly::to<uint32_t>(lowerName);
return static_cast<LogLevel>(level);
} catch (const std::exception&) {
throw std::range_error("invalid logger level: " + name.str());
}
}
File::File(StringPiece name, int flags, mode_t mode)
: File(name.str(), flags, mode) {}
AsyncFileWriter::AsyncFileWriter(StringPiece path)
: AsyncFileWriter{File{path.str(), O_WRONLY | O_APPEND | O_CREAT}} {}
