libreoffice-online/common/Util.hpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*/
#ifndef INCLUDED_UTIL_HPP
#define INCLUDED_UTIL_HPP
#include <cassert>
#include <cerrno>
#include <cstddef>
#include <atomic>
#include <functional>
#include <memory>
#include <mutex>
#include <set>
#include <sstream>
#include <string>
#include <memory.h>
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#include <Poco/File.h>
#include <Poco/Path.h>
#include <Poco/Process.h>
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#include <Poco/RegularExpression.h>
#define LOK_USE_UNSTABLE_API
#include <LibreOfficeKit/LibreOfficeKitEnums.h>
namespace Util
{
namespace rng
{
void reseed();
unsigned getNext();
/// Generate an array of random characters.
std::vector<char> getBytes(const size_t length);
/// Generates a random string suitable for
/// file/directory names.
std::string getFilename(const size_t length);
}
/// Create randomized temporary directory
std::string createRandomTmpDir();
/// Get number of threads in this process or -1 on error
int getProcessThreadCount();
/// Spawn a process if stdInput is non-NULL it contains a writable descriptor
/// to send data to the child.
int spawnProcess(const std::string &cmd, const std::vector<std::string> &args,
int *stdInput = nullptr);
/// Hex to unsigned char
bool dataFromHexString(const std::string& hexString, std::vector<unsigned char>& data);
/// Encode an integral ID into a string, with padding support.
std::string encodeId(const unsigned number, const int padding = 5);
/// Decode an integral ID from a string.
unsigned decodeId(const std::string& str);
bool windowingAvailable();
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#if !defined(BUILDING_TESTS) && !defined(KIT_IN_PROCESS)
/// Send a message to all clients.
void alertAllUsers(const std::string& msg);
/// Send a 'error:' message with the specified cmd and kind parameters to all connected
/// clients. This function can be called either in loolwsd or loolkit processes, even if only
/// loolwsd obviously has contact with the actual clients; in loolkit it will be forwarded to
/// loolwsd for redistribution. (This function must be implemented separately in each program
/// that uses it, it is not in Util.cpp.)
void alertAllUsers(const std::string& cmd, const std::string& kind);
#else
/// No-op implementation in the test programs
inline void alertAllUsers(const std::string&)
{
}
/// No-op implementation in the test programs
inline void alertAllUsers(const std::string&, const std::string&)
{
}
#endif
/// Assert that a lock is already taken.
template <typename T>
void assertIsLocked(const T& lock)
{
#ifdef NDEBUG
(void) lock;
#else
assert(lock.owns_lock());
#endif
}
inline void assertIsLocked(std::mutex& mtx)
{
#ifdef NDEBUG
(void) mtx;
#else
assert(!mtx.try_lock());
#endif
}
/// Print given number of bytes in human-understandable form (KB,MB, etc.)
std::string getHumanizedBytes(unsigned long nBytes);
/// Returns the total physical memory (in kB) available in the system
size_t getTotalSystemMemoryKb();
/// Returns the process PSS in KB (works only when we have perms for /proc/pid/smaps).
size_t getMemoryUsagePSS(const Poco::Process::PID pid);
/// Returns the process RSS in KB.
size_t getMemoryUsageRSS(const Poco::Process::PID pid);
/// Returns the RSS and PSS of the current process in KB.
/// Example: "procmemstats: pid=123 rss=12400 pss=566"
std::string getMemoryStats(FILE* file);
size_t getCpuUsage(const Poco::Process::PID pid);
size_t getStatFromPid(const Poco::Process::PID pid, int ind);
std::string replace(std::string s, const std::string& a, const std::string& b);
std::string formatLinesForLog(const std::string& s);
void setThreadName(const std::string& s);
const char *getThreadName();
pid_t getThreadId();
/// Get version information
void getVersionInfo(std::string& version, std::string& hash);
/// Return a string that is unique across processes and calls.
std::string UniqueId();
// Extract all json entries into a map.
std::map<std::string, std::string> JsonToMap(const std::string& jsonString);
/// Dump a lineof data as hex
inline std::string stringifyHexLine(
const std::vector<char> &buffer,
unsigned int offset,
const unsigned int width = 32)
{
char scratch[64];
std::stringstream os;
for (unsigned int i = 0; i < width; i++)
{
if (i && (i % 8) == 0)
os << " ";
if ((offset + i) < buffer.size())
sprintf (scratch, "%.2x ", (unsigned char)buffer[offset+i]);
else
sprintf (scratch, " ");
os << scratch;
}
os << " | ";
for (unsigned int i = 0; i < width; i++)
{
if ((offset + i) < buffer.size() && ::isprint(buffer[offset+i]))
sprintf (scratch, "%c", buffer[offset+i]);
else
sprintf (scratch, ".");
os << scratch;
}
return os.str();
}
/// Dump data as hex and chars to stream
inline void dumpHex (std::ostream &os, const char *legend, const char *prefix,
const std::vector<char> &buffer, bool skipDup = true,
const unsigned int width = 32)
{
unsigned int j;
char scratch[64];
int skip = 0;
std::string lastLine;
os << legend;
for (j = 0; j < buffer.size() + width - 1; j += width)
{
sprintf (scratch, "%s0x%.4x ", prefix, j);
os << scratch;
std::string line = stringifyHexLine(buffer, j, width);
if (skipDup && lastLine == line)
skip++;
else {
if (skip > 0)
{
os << "... dup " << skip - 1 << "...";
skip = 0;
}
else
os << line;
}
lastLine.swap(line);
os << "\n";
}
os.flush();
}
/// Trim spaces from the left. Just spaces.
inline std::string& ltrim(std::string& s)
{
const size_t pos = s.find_first_not_of(' ');
if (pos != std::string::npos)
{
s = s.substr(pos);
}
return s;
}
/// Trim spaces from the left and copy. Just spaces.
inline std::string ltrimmed(const std::string& s)
{
const size_t pos = s.find_first_not_of(' ');
if (pos != std::string::npos)
{
return s.substr(pos);
}
return s;
}
/// Trim spaces from both left and right. Just spaces.
inline std::string& trim(std::string& s)
{
const size_t first = s.find_first_not_of(' ');
const size_t last = s.find_last_not_of(' ');
if (first != std::string::npos)
{
if (last != std::string::npos)
{
s = s.substr(first, last + 1 - first);
}
else
{
s = s.substr(first);
}
}
else
{
if (last != std::string::npos)
{
s = s.substr(0, last + 1);
}
else
{
s.clear();
}
}
return s;
}
/// Trim spaces from both left and right and copy. Just spaces.
inline std::string trimmed(const std::string& s)
{
const size_t first = s.find_first_not_of(' ');
const size_t last = s.find_last_not_of(' ');
if (first != std::string::npos)
{
if (last != std::string::npos)
{
return s.substr(first, last + 1 - first);
}
return s.substr(first);
}
if (last != std::string::npos)
{
return s.substr(0, last + 1);
}
return std::string();
}
/// Trim spaces from left and right. Just spaces.
inline std::string trimmed(const char* s)
{
return trimmed(std::string(s));
}
inline bool startsWith(const std::string& s, const std::string& t)
{
return s.length() >= t.length() && memcmp(s.c_str(), t.c_str(), t.length()) == 0;
}
/// Return the symbolic name for an errno value, or in decimal if not handled here.
inline std::string symbolicErrno(int e)
{
// Errnos from <asm-generic/errno-base.h> and <asm-generic/errno.h> on Linux.
switch (e)
{
case EPERM: return "EPERM";
case ENOENT: return "ENOENT";
case ESRCH: return "ESRCH";
case EINTR: return "EINTR";
case EIO: return "EIO";
case ENXIO: return "ENXIO";
case E2BIG: return "E2BIG";
case ENOEXEC: return "ENOEXEC";
case EBADF: return "EBADF";
case ECHILD: return "ECHILD";
case EAGAIN: return "EAGAIN";
case ENOMEM: return "ENOMEM";
case EACCES: return "EACCES";
case EFAULT: return "EFAULT";
case ENOTBLK: return "ENOTBLK";
case EBUSY: return "EBUSY";
case EEXIST: return "EEXIST";
case EXDEV: return "EXDEV";
case ENODEV: return "ENODEV";
case ENOTDIR: return "ENOTDIR";
case EISDIR: return "EISDIR";
case EINVAL: return "EINVAL";
case ENFILE: return "ENFILE";
case EMFILE: return "EMFILE";
case ENOTTY: return "ENOTTY";
case ETXTBSY: return "ETXTBSY";
case EFBIG: return "EFBIG";
case ENOSPC: return "ENOSPC";
case ESPIPE: return "ESPIPE";
case EROFS: return "EROFS";
case EMLINK: return "EMLINK";
case EPIPE: return "EPIPE";
case EDOM: return "EDOM";
case ERANGE: return "ERANGE";
case EDEADLK: return "EDEADLK";
case ENAMETOOLONG: return "ENAMETOOLONG";
case ENOLCK: return "ENOLCK";
case ENOSYS: return "ENOSYS";
case ENOTEMPTY: return "ENOTEMPTY";
case ELOOP: return "ELOOP";
case ENOMSG: return "ENOMSG";
case EIDRM: return "EIDRM";
case ECHRNG: return "ECHRNG";
case EL2NSYNC: return "EL2NSYNC";
case EL3HLT: return "EL3HLT";
case EL3RST: return "EL3RST";
case ELNRNG: return "ELNRNG";
case EUNATCH: return "EUNATCH";
case ENOCSI: return "ENOCSI";
case EL2HLT: return "EL2HLT";
case EBADE: return "EBADE";
case EBADR: return "EBADR";
case EXFULL: return "EXFULL";
case ENOANO: return "ENOANO";
case EBADRQC: return "EBADRQC";
case EBADSLT: return "EBADSLT";
case EBFONT: return "EBFONT";
case ENOSTR: return "ENOSTR";
case ENODATA: return "ENODATA";
case ETIME: return "ETIME";
case ENOSR: return "ENOSR";
case ENONET: return "ENONET";
case ENOPKG: return "ENOPKG";
case EREMOTE: return "EREMOTE";
case ENOLINK: return "ENOLINK";
case EADV: return "EADV";
case ESRMNT: return "ESRMNT";
case ECOMM: return "ECOMM";
case EPROTO: return "EPROTO";
case EMULTIHOP: return "EMULTIHOP";
case EDOTDOT: return "EDOTDOT";
case EBADMSG: return "EBADMSG";
case EOVERFLOW: return "EOVERFLOW";
case ENOTUNIQ: return "ENOTUNIQ";
case EBADFD: return "EBADFD";
case EREMCHG: return "EREMCHG";
case ELIBACC: return "ELIBACC";
case ELIBBAD: return "ELIBBAD";
case ELIBSCN: return "ELIBSCN";
case ELIBMAX: return "ELIBMAX";
case ELIBEXEC: return "ELIBEXEC";
case EILSEQ: return "EILSEQ";
case ERESTART: return "ERESTART";
case ESTRPIPE: return "ESTRPIPE";
case EUSERS: return "EUSERS";
case ENOTSOCK: return "ENOTSOCK";
case EDESTADDRREQ: return "EDESTADDRREQ";
case EMSGSIZE: return "EMSGSIZE";
case EPROTOTYPE: return "EPROTOTYPE";
case ENOPROTOOPT: return "ENOPROTOOPT";
case EPROTONOSUPPORT: return "EPROTONOSUPPORT";
case ESOCKTNOSUPPORT: return "ESOCKTNOSUPPORT";
case EOPNOTSUPP: return "EOPNOTSUPP";
case EPFNOSUPPORT: return "EPFNOSUPPORT";
case EAFNOSUPPORT: return "EAFNOSUPPORT";
case EADDRINUSE: return "EADDRINUSE";
case EADDRNOTAVAIL: return "EADDRNOTAVAIL";
case ENETDOWN: return "ENETDOWN";
case ENETUNREACH: return "ENETUNREACH";
case ENETRESET: return "ENETRESET";
case ECONNABORTED: return "ECONNABORTED";
case ECONNRESET: return "ECONNRESET";
case ENOBUFS: return "ENOBUFS";
case EISCONN: return "EISCONN";
case ENOTCONN: return "ENOTCONN";
case ESHUTDOWN: return "ESHUTDOWN";
case ETOOMANYREFS: return "ETOOMANYREFS";
case ETIMEDOUT: return "ETIMEDOUT";
case ECONNREFUSED: return "ECONNREFUSED";
case EHOSTDOWN: return "EHOSTDOWN";
case EHOSTUNREACH: return "EHOSTUNREACH";
case EALREADY: return "EALREADY";
case EINPROGRESS: return "EINPROGRESS";
case ESTALE: return "ESTALE";
case EUCLEAN: return "EUCLEAN";
case ENOTNAM: return "ENOTNAM";
case ENAVAIL: return "ENAVAIL";
case EISNAM: return "EISNAM";
case EREMOTEIO: return "EREMOTEIO";
case EDQUOT: return "EDQUOT";
case ENOMEDIUM: return "ENOMEDIUM";
case EMEDIUMTYPE: return "EMEDIUMTYPE";
case ECANCELED: return "ECANCELED";
case ENOKEY: return "ENOKEY";
case EKEYEXPIRED: return "EKEYEXPIRED";
case EKEYREVOKED: return "EKEYREVOKED";
case EKEYREJECTED: return "EKEYREJECTED";
case EOWNERDEAD: return "EOWNERDEAD";
case ENOTRECOVERABLE: return "ENOTRECOVERABLE";
case ERFKILL: return "ERFKILL";
case EHWPOISON: return "EHWPOISON";
default: return std::to_string(e);
}
}
/// Check for the URI scheme validity.
/// For now just a basic sanity check, can be extended if necessary.
bool isValidURIScheme(const std::string& scheme);
/// Check for the URI host validity.
/// For now just a basic sanity check, can be extended if necessary.
bool isValidURIHost(const std::string& host);
/// Given one or more patterns to allow, and one or more to deny,
/// the match member will return true if, and only if, the subject
/// matches the allowed list, but not the deny.
/// By default, everything is denied.
class RegexListMatcher
{
public:
RegexListMatcher() :
_allowByDefault(false)
{
}
RegexListMatcher(const bool allowByDefault) :
_allowByDefault(allowByDefault)
{
}
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RegexListMatcher(std::initializer_list<std::string> allowed) :
_allowByDefault(false),
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_allowed(allowed)
{
}
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RegexListMatcher(std::initializer_list<std::string> allowed,
std::initializer_list<std::string> denied) :
_allowByDefault(false),
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_allowed(allowed),
_denied(denied)
{
}
RegexListMatcher(const bool allowByDefault,
std::initializer_list<std::string> denied) :
_allowByDefault(allowByDefault),
_denied(denied)
{
}
void allow(const std::string& pattern) { _allowed.insert(pattern); }
void deny(const std::string& pattern)
{
_allowed.erase(pattern);
_denied.insert(pattern);
}
void clear()
{
_allowed.clear();
_denied.clear();
}
bool match(const std::string& subject) const
{
return (_allowByDefault || match(_allowed, subject)) && !match(_denied, subject);
}
private:
static bool match(const std::set<std::string>& set, const std::string& subject)
{
if (set.find(subject) != set.end())
{
return true;
}
// Not a perfect match, try regex.
for (const auto& value : set)
{
try
{
// Not performance critical to warrant caching.
Poco::RegularExpression re(value, Poco::RegularExpression::RE_CASELESS);
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Poco::RegularExpression::Match reMatch;
// Must be a full match.
if (re.match(subject, reMatch) && reMatch.offset == 0 && reMatch.length == subject.size())
{
return true;
}
}
catch (const std::exception& exc)
{
// Nothing to do; skip.
}
}
return false;
}
private:
const bool _allowByDefault;
std::set<std::string> _allowed;
std::set<std::string> _denied;
};
/// A logical constant that is allowed to initialize
/// exactly once and checks usage before initialization.
template <typename T>
class RuntimeConstant
{
T _value;
std::atomic<bool> _initialized;
public:
RuntimeConstant()
: _value()
, _initialized(false)
{
}
/// Use a compile-time const instead.
RuntimeConstant(const T& value) = delete;
const T& get()
{
if (_initialized)
{
return _value;
}
throw std::runtime_error("RuntimeConstant instance read before being initialized.");
}
void set(const T& value)
{
assert(!_initialized);
_initialized = true;
_value = value;
}
};
} // end namespace Util
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */