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Edit File : wsrep_utils.h \| Size : 9.07 KB
/* Copyright (C) 2013-2015 Codership Oy <info@codership.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. / #ifndef WSREP_UTILS_H #define WSREP_UTILS_H #include "wsrep_priv.h" #include "wsrep_mysqld.h" unsigned int wsrep_check_ip (const char const addr, bool is_ipv6); size_t wsrep_guess_ip (char buf, size_t buf_len); /* returns the length of the host part of the address string / size_t wsrep_host_len(const char addr, size_t addr_len); namespace wsp { class Address { public: Address() : m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false) { memset(m_address, 0, sizeof(m_address)); } Address(const char addr_in) : m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false) { memset(m_address, 0, sizeof(m_address)); parse_addr(addr_in); } bool is_valid() { return m_valid; } bool is_ipv6() { return (m_family == INET6); } const char get_address() { return m_address; } size_t get_address_len() { return m_address_len; } int get_port() { return m_port; } void set_port(int port) { m_port= port; } private: enum family { UNSPEC= 0, INET, /* IPv4 / INET6, / IPv6 / }; char m_address[256]; size_t m_address_len; family m_family; int m_port; bool m_valid; void parse_addr(const char addr_in) { const char start; const char end; const char port; const char open_bracket= strchr(const_cast<char >(addr_in), '['); const char close_bracket= strchr(const_cast<char >(addr_in), ']'); const char colon= strchr(const_cast<char >(addr_in), ':'); const char dot= strchr(const_cast<char >(addr_in), '.'); int cc= colon_count(addr_in); if (open_bracket != NULL \|\| dot == NULL \|\| (colon != NULL && (dot == NULL \|\| colon < dot))) { // This could be an IPv6 address or a hostname if (open_bracket != NULL) { / Sanity check: Address with '[' must include ']' / if (close_bracket == NULL && open_bracket < close_bracket) / Error: malformed address / { m_valid= false; return; } start= open_bracket + 1; end= close_bracket; / Check for port / port= strchr(close_bracket, ':'); if ((port != NULL) && parse_port(port + 1)) { return; / Error: invalid port / } m_family= INET6; } else { switch (cc) { case 0: / Hostname with no port / start= addr_in; end= addr_in + strlen(addr_in); break; case 1: / Hostname with port (host:port) / start= addr_in; end= colon; if (parse_port(colon + 1)) return; / Error: invalid port / break; default: / IPv6 address / start= addr_in; end= addr_in + strlen(addr_in); m_family= INET6; break; } } } else { / IPv4 address or hostname / start= addr_in; if (colon != NULL) { / Port / end= colon; if (parse_port(colon + 1)) return; / Error: invalid port / } else { end= addr_in + strlen(addr_in); } } size_t len= end - start; / Safety / if (len >= sizeof(m_address)) { // The supplied address is too large to fit into the internal buffer. m_valid= false; return; } memcpy(m_address, start, len); m_address[len]= '\0'; m_address_len= ++ len; m_valid= true; return; } int colon_count(const char addr) { int count= 0, i= 0; while(addr[i] != '\0') { if (addr[i] == ':') ++count; ++ i; } return count; } bool parse_port(const char port) { errno= 0; / Reset the errno / m_port= strtol(port, NULL, 10); if (errno == EINVAL \|\| errno == ERANGE) { m_port= 0; / Error: invalid port / m_valid= false; return true; } return false; } }; class Config_state { public: Config_state() : view_(), status_(wsrep::server_state::s_disconnected) {} void set(const wsrep::view& view) { wsrep_notify_status(status_, &view); lock(); view_= view; unlock(); } void set(enum wsrep::server_state::state status) { if (status == wsrep::server_state::s_donor \|\| status == wsrep::server_state::s_synced) wsrep_notify_status(status, &view_); else wsrep_notify_status(status); lock(); status_= status; unlock(); } const wsrep::view& get_view_info() const { return view_; } enum wsrep::server_state::state get_status() const { return status_; } int lock() { return mysql_mutex_lock(&LOCK_wsrep_config_state); } int unlock() { return mysql_mutex_unlock(&LOCK_wsrep_config_state); } private: wsrep::view view_; enum wsrep::server_state::state status_; }; } / namespace wsp / extern wsp::Config_state wsrep_config_state; namespace wsp { /* a class to manage env vars array / class env { private: size_t len_; char* env_; int errno_; bool ctor_common(char e); void dtor(); env& operator =(env); public: explicit env(char env); explicit env(const env&); ~env(); int append(const char* var); /* add a new env. var / int error() const { return errno_; } char* operator()() { return env_; } }; /* A small class to run external programs. / class process { private: const char const str_; FILE* io_; int err_; pid_t pid_; public: /! @arg type is a pointer to a null-terminated string which must contain either the letter 'r' for reading or the letter 'w' for writing. @arg env optional null-terminated vector of environment variables / process (const char* cmd, const char* type, char** env); ~process (); FILE* pipe () { return io_; } int error() { return err_; } int wait (); const char* cmd() { return str_; } }; class thd { class thd_init { public: thd_init() { my_thread_init(); } ~thd_init() { my_thread_end(); } } init; thd (const thd&); thd& operator= (const thd&); public: thd(my_bool wsrep_on, bool system_thread=false); ~thd(); THD* const ptr; }; class string { public: string() : string_(0) {} explicit string(size_t s) : string_(static_cast<char>(malloc(s))) {} char operator()() { return string_; } void set(char* str) { if (string_) free (string_); string_= str; } ~string() { set (0); } private: char* string_; }; /* scope level lock / class auto_lock { public: auto_lock(mysql_mutex_t m) : m_(m) { mysql_mutex_lock(m_); } ~auto_lock() { mysql_mutex_unlock(m_); } private: mysql_mutex_t& operator =(mysql_mutex_t&); mysql_mutex_t* const m_; }; #ifdef REMOVED class lock { pthread_mutex_t* const mtx_; public: lock (pthread_mutex_t* mtx) : mtx_(mtx) { int err= pthread_mutex_lock (mtx_); if (err) { WSREP_ERROR("Mutex lock failed: %s", strerror(err)); abort(); } } virtual ~lock () { int err= pthread_mutex_unlock (mtx_); if (err) { WSREP_ERROR("Mutex unlock failed: %s", strerror(err)); abort(); } } inline void wait (pthread_cond_t* cond) { pthread_cond_wait (cond, mtx_); } private: lock (const lock&); lock& operator=(const lock&); }; class monitor { int mutable refcnt; pthread_mutex_t mutable mtx; pthread_cond_t mutable cond; public: monitor() : refcnt(0) { pthread_mutex_init (&mtx, NULL); pthread_cond_init (&cond, NULL); } ~monitor() { pthread_mutex_destroy (&mtx); pthread_cond_destroy (&cond); } void enter() const { lock l(&mtx); while (refcnt) { l.wait(&cond); } refcnt++; } void leave() const { lock l(&mtx); refcnt--; if (refcnt == 0) { pthread_cond_signal (&cond); } } private: monitor (const monitor&); monitor& operator= (const monitor&); }; class critical { const monitor& mon; public: critical(const monitor& m) : mon(m) { mon.enter(); } ~critical() { mon.leave(); } private: critical (const critical&); critical& operator= (const critical&); }; #endif } // namespace wsrep #endif /* WSREP_UTILS_H */ Back

Edit File : wsrep_utils.h | Size : 9.07 KB

This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. */

#ifndef WSREP_UTILS_H
#define WSREP_UTILS_H

#include "wsrep_priv.h"
#include "wsrep_mysqld.h"

unsigned int wsrep_check_ip (const char* const addr, bool *is_ipv6);
size_t wsrep_guess_ip (char* buf, size_t buf_len);

/* returns the length of the host part of the address string */
size_t wsrep_host_len(const char* addr, size_t addr_len);

namespace wsp {

class Address {
public:
  Address()
    : m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false)
  {
    memset(m_address, 0, sizeof(m_address));
  }
  Address(const char *addr_in)
    : m_address_len(0), m_family(UNSPEC), m_port(0), m_valid(false)
  {
    memset(m_address, 0, sizeof(m_address));
    parse_addr(addr_in);
  }
  bool is_valid() { return m_valid; }
  bool is_ipv6() { return (m_family == INET6); }

const char* get_address() { return m_address; }
  size_t get_address_len() { return m_address_len; }
  int get_port() { return m_port; }
  void set_port(int port) { m_port= port; }

private:
  enum family {
    UNSPEC= 0,
    INET,                                       /* IPv4 */
    INET6,                                      /* IPv6 */
  };

char   m_address[256];
  size_t m_address_len;
  family m_family;
  int    m_port;
  bool   m_valid;

void parse_addr(const char *addr_in) {
    const char *start;
    const char *end;
    const char *port;
    const char* open_bracket= strchr(const_cast<char *>(addr_in), '[');
    const char* close_bracket= strchr(const_cast<char *>(addr_in), ']');
    const char* colon= strchr(const_cast<char *>(addr_in), ':');
    const char* dot= strchr(const_cast<char *>(addr_in), '.');

int cc= colon_count(addr_in);

if (open_bracket != NULL ||
        dot == NULL ||
        (colon != NULL && (dot == NULL || colon < dot)))
    {
      // This could be an IPv6 address or a hostname
      if (open_bracket != NULL) {
        /* Sanity check: Address with '[' must include ']' */
        if (close_bracket == NULL &&
            open_bracket < close_bracket)       /* Error: malformed address */
        {
          m_valid= false;
          return;
        }

start= open_bracket + 1;
        end= close_bracket;

/* Check for port */
        port= strchr(close_bracket, ':');
        if ((port != NULL) && parse_port(port + 1))
        {
          return;                               /* Error: invalid port */
        }
        m_family= INET6;
      }
      else
      {
        switch (cc) {
        case 0:
          /* Hostname with no port */
          start= addr_in;
          end= addr_in + strlen(addr_in);
          break;
        case 1:
          /* Hostname with port (host:port) */
          start= addr_in;
          end= colon;
          if (parse_port(colon + 1))
            return;                             /* Error: invalid port */
          break;
        default:
          /* IPv6 address */
          start= addr_in;
          end= addr_in + strlen(addr_in);
          m_family= INET6;
          break;
        }
      }
    } else {                                    /* IPv4 address or hostname */
      start= addr_in;
      if (colon != NULL) {                      /* Port */
        end= colon;
        if (parse_port(colon + 1))
          return;                               /* Error: invalid port */
      } else {
        end= addr_in + strlen(addr_in);
      }
    }

size_t len= end - start;

/* Safety */
    if (len >= sizeof(m_address))
    {
      // The supplied address is too large to fit into the internal buffer.
      m_valid= false;
      return;
    }

memcpy(m_address, start, len);
    m_address[len]= '\0';
    m_address_len= ++ len;
    m_valid= true;
    return;
  }

int colon_count(const char *addr) {
    int count= 0, i= 0;

while(addr[i] != '\0')
    {
      if (addr[i] == ':') ++count;
      ++ i;
    }
    return count;
  }

bool parse_port(const char *port) {
    errno= 0;                                   /* Reset the errno */
    m_port= strtol(port, NULL, 10);
    if (errno == EINVAL || errno == ERANGE)
    {
      m_port= 0;                                /* Error: invalid port */
      m_valid= false;
      return true;
    }
    return false;
  }
};

class Config_state
{
public:
  Config_state() : view_(), status_(wsrep::server_state::s_disconnected)
  {}

void set(const wsrep::view& view)
  {
    wsrep_notify_status(status_, &view);

lock();
    view_= view;
    unlock();
  }

void set(enum wsrep::server_state::state status)
  {
    if (status == wsrep::server_state::s_donor ||
	status == wsrep::server_state::s_synced)
      wsrep_notify_status(status, &view_);
    else
      wsrep_notify_status(status);

lock();
    status_= status;
    unlock();
  }

const wsrep::view& get_view_info() const
  {
    return view_;
  }

enum wsrep::server_state::state get_status() const
  {
    return status_;
  }

int lock()
  {
    return mysql_mutex_lock(&LOCK_wsrep_config_state);
  }

int unlock()
  {
    return mysql_mutex_unlock(&LOCK_wsrep_config_state);
  }

private:
  wsrep::view view_;
  enum wsrep::server_state::state status_;
};

} /* namespace wsp */

extern wsp::Config_state *wsrep_config_state;

namespace wsp {
/* a class to manage env vars array */
class env
{
private:
    size_t len_;
    char** env_;
    int    errno_;
    bool ctor_common(char** e);
    void dtor();
    env& operator =(env);
public:
    explicit env(char** env);
    explicit env(const env&);
    ~env();
    int append(const char* var); /* add a new env. var */
    int error() const { return errno_; }
    char** operator()() { return env_; }
};

/* A small class to run external programs. */
class process
{
private:
    const char* const str_;
    FILE*       io_;
    int         err_;
    pid_t       pid_;

public:
/*! @arg type is a pointer to a null-terminated string which  must  contain
         either  the  letter  'r'  for  reading  or the letter 'w' for writing.
    @arg env optional null-terminated vector of environment variables
 */
    process  (const char* cmd, const char* type, char** env);
    ~process ();

FILE* pipe () { return io_;  }
    int   error() { return err_; }
    int   wait ();
    const char* cmd() { return str_; }
};

class thd
{
  class thd_init
  {
  public:
    thd_init()  { my_thread_init(); }
    ~thd_init() { my_thread_end();  }
  }
  init;

thd (const thd&);
  thd& operator= (const thd&);

public:

thd(my_bool wsrep_on, bool system_thread=false);
  ~thd();
  THD* const ptr;
};

class string
{
public:
    string() : string_(0) {}
    explicit string(size_t s) : string_(static_cast<char*>(malloc(s))) {}
    char* operator()() { return string_; }
    void set(char* str) { if (string_) free (string_); string_= str; }
    ~string() { set (0); }
private:
    char* string_;
};

/* scope level lock */
class auto_lock
{
public:
  auto_lock(mysql_mutex_t* m) : m_(m) { mysql_mutex_lock(m_); }
  ~auto_lock() { mysql_mutex_unlock(m_); }
private:
  mysql_mutex_t& operator =(mysql_mutex_t&);
  mysql_mutex_t* const m_;
};

#ifdef REMOVED
class lock
{
  pthread_mutex_t* const mtx_;

public:

lock (pthread_mutex_t* mtx) : mtx_(mtx)
  {
    int err= pthread_mutex_lock (mtx_);

if (err)
    {
      WSREP_ERROR("Mutex lock failed: %s", strerror(err));
      abort();
    }
  }

virtual ~lock ()
  {
    int err= pthread_mutex_unlock (mtx_);

if (err)
    {
      WSREP_ERROR("Mutex unlock failed: %s", strerror(err));
      abort();
    }
  }

inline void wait (pthread_cond_t* cond)
  {
    pthread_cond_wait (cond, mtx_);
  }

private:

lock (const lock&);
  lock& operator=(const lock&);

};

class monitor
{
  int             mutable refcnt;
  pthread_mutex_t mutable mtx;
  pthread_cond_t  mutable cond;

public:

monitor() : refcnt(0)
  {
    pthread_mutex_init (&mtx, NULL);
    pthread_cond_init  (&cond, NULL);
  }

~monitor()
  {
    pthread_mutex_destroy (&mtx);
    pthread_cond_destroy  (&cond);
  }

void enter() const
  {
    lock l(&mtx);

while (refcnt)
    {
      l.wait(&cond);
    }
    refcnt++;
  }

void leave() const
  {
    lock l(&mtx);

refcnt--;
    if (refcnt == 0)
    {
      pthread_cond_signal (&cond);
    }
  }

private:

monitor (const monitor&);
  monitor& operator= (const monitor&);
};

class critical
{
  const monitor& mon;

public:

critical(const monitor& m) : mon(m) { mon.enter(); }

~critical() { mon.leave(); }

private:

critical (const critical&);
  critical& operator= (const critical&);
};
#endif

} // namespace wsrep

#endif /* WSREP_UTILS_H */

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