openGauss-server/contrib/gtm/main/gtm_backup.cpp

#include "gtm/gtm_c.h"
#include "gtm/gtm_lock.h"
#include "gtm/gtm_txn.h"
#include "gtm/gtm_seq.h"
#include "gtm/gtm_backup.h"
#include "gtm/elog.h"

GTM_RWLock gtm_bkup_lock;
bool gtm_need_bkup;

extern char GTMControlFile[];

void GTM_WriteRestorePoint(void)
{
    FILE* f;

    GTM_RWLockAcquire(&gtm_bkup_lock, GTM_LOCKMODE_WRITE);
    if (!gtm_need_bkup) {
        GTM_RWLockRelease(&gtm_bkup_lock);
        return;
    }

    f = fopen(GTMControlFile, "w");
    if (f == NULL) {
        ereport(LOG, (errno, errmsg("Cannot open control file"), errhint("%s", strerror(errno))));
        return;
    }
    gtm_need_bkup = FALSE;
    GTM_RWLockRelease(&gtm_bkup_lock);
    GTM_WriteRestorePointXid(f);
    GTM_WriteRestorePointSeq(f);
    fclose(f);
}

void GTM_WriteBarrierBackup(char* barrier_id)
{
#define MyMAXPATH 1023

    FILE* f;
    char BarrierFilePath[MyMAXPATH + 1];
    extern char* GTMDataDir;

    int rc = -1;
    rc = snprintf_s(BarrierFilePath, MyMAXPATH, MyMAXPATH - 1, "%s/GTM_%s.control", GTMDataDir, barrier_id);
    securec_check_ss(rc, "\0", "\0");
    
    if ((f = fopen(BarrierFilePath, "w")) == NULL) {
        ereport(LOG, (errno, errmsg("Cannot open control file"), errhint("%s", strerror(errno))));
        return;
    }
    GTM_RWLockAcquire(&gtm_bkup_lock, GTM_LOCKMODE_WRITE);
    gtm_need_bkup = FALSE;
    GTM_RWLockRelease(&gtm_bkup_lock);
    GTM_WriteRestorePointXid(f);
    GTM_WriteRestorePointSeq(f);
    fclose(f);
}

void GTM_MakeBackup(char* path)
{
    FILE* f = fopen(path, "w");

    if (f == NULL) {
        ereport(LOG, (errno, errmsg("Cannot open backup file %s", path), errhint("%s", strerror(errno))));
        return;
    }
    GTM_SaveTxnInfo(f);
    GTM_SaveSeqInfo(f);
    fclose(f);
}

void GTM_SetNeedBackup(void)
{
    GTM_RWLockAcquire(&gtm_bkup_lock, GTM_LOCKMODE_READ);
    gtm_need_bkup = TRUE;
    GTM_RWLockRelease(&gtm_bkup_lock);
}

bool GTM_NeedBackup(void)
{
    return gtm_need_bkup;
}