streamutil.c File Reference

#include "postgres_fe.h"
#include <sys/time.h>
#include <unistd.h>
#include "access/xlog_internal.h"
#include "common/connect.h"
#include "common/fe_memutils.h"
#include "common/file_perm.h"
#include "common/logging.h"
#include "common/string.h"
#include "datatype/timestamp.h"
#include "port/pg_bswap.h"
#include "pqexpbuffer.h"
#include "receivelog.h"
#include "streamutil.h"

Include dependency graph for streamutil.c:

Go to the source code of this file.

Macros
#define	ERRCODE_DUPLICATE_OBJECT   "42710"
#define	MINIMUM_VERSION_FOR_SHOW_CMD   100000
#define	MINIMUM_VERSION_FOR_GROUP_ACCESS   110000

Functions
static bool	RetrieveDataDirCreatePerm (PGconn *conn)
PGconn *	GetConnection (void)
bool	RetrieveWalSegSize (PGconn *conn)
bool	RunIdentifySystem (PGconn *conn, char **sysid, TimeLineID *starttli, XLogRecPtr *startpos, char **db_name)
bool	GetSlotInformation (PGconn *conn, const char *slot_name, XLogRecPtr *restart_lsn, TimeLineID *restart_tli)
bool	CreateReplicationSlot (PGconn *conn, const char *slot_name, const char *plugin, bool is_temporary, bool is_physical, bool reserve_wal, bool slot_exists_ok, bool two_phase)
bool	DropReplicationSlot (PGconn *conn, const char *slot_name)
void	AppendPlainCommandOption (PQExpBuffer buf, bool use_new_option_syntax, char *option_name)
void	AppendStringCommandOption (PQExpBuffer buf, bool use_new_option_syntax, char *option_name, char *option_value)
void	AppendIntegerCommandOption (PQExpBuffer buf, bool use_new_option_syntax, char *option_name, int32 option_value)
TimestampTz	feGetCurrentTimestamp (void)
void	feTimestampDifference (TimestampTz start_time, TimestampTz stop_time, long *secs, int *microsecs)
bool	feTimestampDifferenceExceeds (TimestampTz start_time, TimestampTz stop_time, int msec)
void	fe_sendint64 (int64 i, char *buf)
int64	fe_recvint64 (char *buf)

Variables
uint32	WalSegSz
const char *	progname
char *	connection_string = NULL
char *	dbhost = NULL
char *	dbuser = NULL
char *	dbport = NULL
char *	dbname = NULL
int	dbgetpassword = 0
static char *	password = NULL
PGconn *	conn = NULL

Macro Definition Documentation

ERRCODE_DUPLICATE_OBJECT

#define ERRCODE_DUPLICATE_OBJECT   "42710"

Definition at line 32 of file streamutil.c.

MINIMUM_VERSION_FOR_GROUP_ACCESS

#define MINIMUM_VERSION_FOR_GROUP_ACCESS   110000

Definition at line 44 of file streamutil.c.

MINIMUM_VERSION_FOR_SHOW_CMD

#define MINIMUM_VERSION_FOR_SHOW_CMD   100000

Definition at line 39 of file streamutil.c.

Function Documentation

AppendIntegerCommandOption()

void AppendIntegerCommandOption	(	PQExpBuffer	buf,
		bool	use_new_option_syntax,
		char *	option_name,
		int32	option_value
	)

Definition at line 776 of file streamutil.c.

{
    AppendPlainCommandOption(buf, use_new_option_syntax, option_name);
 
    appendPQExpBuffer(buf, " %d", option_value);
}

References AppendPlainCommandOption(), appendPQExpBuffer(), and buf.

Referenced by BaseBackup().

AppendPlainCommandOption()

void AppendPlainCommandOption	(	PQExpBuffer	buf,
		bool	use_new_option_syntax,
		char *	option_name
	)

Definition at line 732 of file streamutil.c.

{
    if (buf->len > 0 && buf->data[buf->len - 1] != '(')
    {
        if (use_new_option_syntax)
            appendPQExpBufferStr(buf, ", ");
        else
            appendPQExpBufferChar(buf, ' ');
    }
 
    appendPQExpBuffer(buf, " %s", option_name);
}

References appendPQExpBuffer(), appendPQExpBufferChar(), appendPQExpBufferStr(), and buf.

Referenced by AppendIntegerCommandOption(), AppendStringCommandOption(), BaseBackup(), and CreateReplicationSlot().

AppendStringCommandOption()

void AppendStringCommandOption	(	PQExpBuffer	buf,
		bool	use_new_option_syntax,
		char *	option_name,
		char *	option_value
	)

Definition at line 753 of file streamutil.c.

{
    AppendPlainCommandOption(buf, use_new_option_syntax, option_name);
 
    if (option_value != NULL)
    {
        size_t      length = strlen(option_value);
        char       *escaped_value = palloc(1 + 2 * length);
 
        PQescapeStringConn(conn, escaped_value, option_value, length, NULL);
        appendPQExpBuffer(buf, " '%s'", escaped_value);
        pfree(escaped_value);
    }
}

References AppendPlainCommandOption(), appendPQExpBuffer(), buf, conn, palloc(), pfree(), and PQescapeStringConn().

Referenced by BaseBackup(), and CreateReplicationSlot().

CreateReplicationSlot()

bool CreateReplicationSlot	(	PGconn *	conn,
		const char *	slot_name,
		const char *	plugin,
		bool	is_temporary,
		bool	is_physical,
		bool	reserve_wal,
		bool	slot_exists_ok,
		bool	two_phase
	)

Definition at line 575 of file streamutil.c.

{
    PQExpBuffer query;
    PGresult   *res;
    bool        use_new_option_syntax = (PQserverVersion(conn) >= 150000);
 
    query = createPQExpBuffer();
 
    Assert((is_physical && plugin == NULL) ||
           (!is_physical && plugin != NULL));
    Assert(!(two_phase && is_physical));
    Assert(slot_name != NULL);
 
    /* Build base portion of query */
    appendPQExpBuffer(query, "CREATE_REPLICATION_SLOT \"%s\"", slot_name);
    if (is_temporary)
        appendPQExpBufferStr(query, " TEMPORARY");
    if (is_physical)
        appendPQExpBufferStr(query, " PHYSICAL");
    else
        appendPQExpBuffer(query, " LOGICAL \"%s\"", plugin);
 
    /* Add any requested options */
    if (use_new_option_syntax)
        appendPQExpBufferStr(query, " (");
    if (is_physical)
    {
        if (reserve_wal)
            AppendPlainCommandOption(query, use_new_option_syntax,
                                     "RESERVE_WAL");
    }
    else
    {
        if (two_phase && PQserverVersion(conn) >= 150000)
            AppendPlainCommandOption(query, use_new_option_syntax,
                                     "TWO_PHASE");
 
        if (PQserverVersion(conn) >= 100000)
        {
            /* pg_recvlogical doesn't use an exported snapshot, so suppress */
            if (use_new_option_syntax)
                AppendStringCommandOption(query, use_new_option_syntax,
                                          "SNAPSHOT", "nothing");
            else
                AppendPlainCommandOption(query, use_new_option_syntax,
                                         "NOEXPORT_SNAPSHOT");
        }
    }
    if (use_new_option_syntax)
    {
        /* Suppress option list if it would be empty, otherwise terminate */
        if (query->data[query->len - 1] == '(')
        {
            query->len -= 2;
            query->data[query->len] = '\0';
        }
        else
            appendPQExpBufferChar(query, ')');
    }
 
    /* Now run the query */
    res = PQexec(conn, query->data);
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        const char *sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
 
        if (slot_exists_ok &&
            sqlstate &&
            strcmp(sqlstate, ERRCODE_DUPLICATE_OBJECT) == 0)
        {
            destroyPQExpBuffer(query);
            PQclear(res);
            return true;
        }
        else
        {
            pg_log_error("could not send replication command \"%s\": %s",
                         query->data, PQerrorMessage(conn));
 
            destroyPQExpBuffer(query);
            PQclear(res);
            return false;
        }
    }
 
    if (PQntuples(res) != 1 || PQnfields(res) != 4)
    {
        pg_log_error("could not create replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
                     slot_name,
                     PQntuples(res), PQnfields(res), 1, 4);
 
        destroyPQExpBuffer(query);
        PQclear(res);
        return false;
    }
 
    destroyPQExpBuffer(query);
    PQclear(res);
    return true;
}

References AppendPlainCommandOption(), appendPQExpBuffer(), appendPQExpBufferChar(), appendPQExpBufferStr(), AppendStringCommandOption(), Assert(), conn, createPQExpBuffer(), PQExpBufferData::data, destroyPQExpBuffer(), ERRCODE_DUPLICATE_OBJECT, PQExpBufferData::len, PG_DIAG_SQLSTATE, pg_log_error, PGRES_TUPLES_OK, plugin, PQclear(), PQerrorMessage(), PQexec(), PQnfields(), PQntuples(), PQresultErrorField(), PQresultStatus(), PQserverVersion(), res, slot_exists_ok, and two_phase.

DropReplicationSlot()

bool DropReplicationSlot	(	PGconn *	conn,
		const char *	slot_name
	)

Definition at line 683 of file streamutil.c.

{
    PQExpBuffer query;
    PGresult   *res;
 
    Assert(slot_name != NULL);
 
    query = createPQExpBuffer();
 
    /* Build query */
    appendPQExpBuffer(query, "DROP_REPLICATION_SLOT \"%s\"",
                      slot_name);
    res = PQexec(conn, query->data);
    if (PQresultStatus(res) != PGRES_COMMAND_OK)
    {
        pg_log_error("could not send replication command \"%s\": %s",
                     query->data, PQerrorMessage(conn));
 
        destroyPQExpBuffer(query);
        PQclear(res);
        return false;
    }
 
    if (PQntuples(res) != 0 || PQnfields(res) != 0)
    {
        pg_log_error("could not drop replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
                     slot_name,
                     PQntuples(res), PQnfields(res), 0, 0);
 
        destroyPQExpBuffer(query);
        PQclear(res);
        return false;
    }
 
    destroyPQExpBuffer(query);
    PQclear(res);
    return true;
}

References appendPQExpBuffer(), Assert(), conn, createPQExpBuffer(), PQExpBufferData::data, destroyPQExpBuffer(), pg_log_error, PGRES_COMMAND_OK, PQclear(), PQerrorMessage(), PQexec(), PQnfields(), PQntuples(), PQresultStatus(), and res.

fe_recvint64()

int64 fe_recvint64

(

char *

buf

)

Definition at line 854 of file streamutil.c.

{
    uint64      n64;
 
    memcpy(&n64, buf, sizeof(n64));
 
    return pg_ntoh64(n64);
}

References buf, and pg_ntoh64.

Referenced by ProcessXLogDataMsg(), and StreamLogicalLog().

fe_sendint64()

void fe_sendint64	(	int64	i,
		char *	buf
	)

Definition at line 843 of file streamutil.c.

{
    uint64      n64 = pg_hton64(i);
 
    memcpy(buf, &n64, sizeof(n64));
}

References buf, i, and pg_hton64.

Referenced by sendFeedback().

feGetCurrentTimestamp()

TimestampTz feGetCurrentTimestamp

(

void

)

Definition at line 789 of file streamutil.c.

{
    TimestampTz result;
    struct timeval tp;
 
    gettimeofday(&tp, NULL);
 
    result = (TimestampTz) tp.tv_sec -
        ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
    result = (result * USECS_PER_SEC) + tp.tv_usec;
 
    return result;
}

References gettimeofday(), POSTGRES_EPOCH_JDATE, SECS_PER_DAY, UNIX_EPOCH_JDATE, and USECS_PER_SEC.

Referenced by flushAndSendFeedback(), HandleCopyStream(), ProcessKeepaliveMsg(), and StreamLogicalLog().

feTimestampDifference()

void feTimestampDifference	(	TimestampTz	start_time,
		TimestampTz	stop_time,
		long *	secs,
		int *	microsecs
	)

Definition at line 808 of file streamutil.c.

{
    TimestampTz diff = stop_time - start_time;
 
    if (diff <= 0)
    {
        *secs = 0;
        *microsecs = 0;
    }
    else
    {
        *secs = (long) (diff / USECS_PER_SEC);
        *microsecs = (int) (diff % USECS_PER_SEC);
    }
}

References start_time, and USECS_PER_SEC.

Referenced by CalculateCopyStreamSleeptime(), and StreamLogicalLog().

feTimestampDifferenceExceeds()

bool feTimestampDifferenceExceeds	(	TimestampTz	start_time,
		TimestampTz	stop_time,
		int	msec
	)

Definition at line 830 of file streamutil.c.

{
    TimestampTz diff = stop_time - start_time;
 
    return (diff >= msec * INT64CONST(1000));
}

References start_time.

Referenced by HandleCopyStream(), and StreamLogicalLog().

GetConnection()

PGconn* GetConnection

(

void

)

Definition at line 62 of file streamutil.c.

{
    PGconn     *tmpconn;
    int         argcount = 7;   /* dbname, replication, fallback_app_name,
                                 * host, user, port, password */
    int         i;
    const char **keywords;
    const char **values;
    const char *tmpparam;
    bool        need_password;
    PQconninfoOption *conn_opts = NULL;
    PQconninfoOption *conn_opt;
    char       *err_msg = NULL;
 
    /* pg_recvlogical uses dbname only; others use connection_string only. */
    Assert(dbname == NULL || connection_string == NULL);
 
    /*
     * Merge the connection info inputs given in form of connection string,
     * options and default values (dbname=replication, replication=true, etc.)
     * Explicitly discard any dbname value in the connection string;
     * otherwise, PQconnectdbParams() would interpret that value as being
     * itself a connection string.
     */
    i = 0;
    if (connection_string)
    {
        conn_opts = PQconninfoParse(connection_string, &err_msg);
        if (conn_opts == NULL)
            pg_fatal("%s", err_msg);
 
        for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
        {
            if (conn_opt->val != NULL && conn_opt->val[0] != '\0' &&
                strcmp(conn_opt->keyword, "dbname") != 0)
                argcount++;
        }
 
        keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
        values = pg_malloc0((argcount + 1) * sizeof(*values));
 
        for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
        {
            if (conn_opt->val != NULL && conn_opt->val[0] != '\0' &&
                strcmp(conn_opt->keyword, "dbname") != 0)
            {
                keywords[i] = conn_opt->keyword;
                values[i] = conn_opt->val;
                i++;
            }
        }
    }
    else
    {
        keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
        values = pg_malloc0((argcount + 1) * sizeof(*values));
    }
 
    keywords[i] = "dbname";
    values[i] = dbname == NULL ? "replication" : dbname;
    i++;
    keywords[i] = "replication";
    values[i] = dbname == NULL ? "true" : "database";
    i++;
    keywords[i] = "fallback_application_name";
    values[i] = progname;
    i++;
 
    if (dbhost)
    {
        keywords[i] = "host";
        values[i] = dbhost;
        i++;
    }
    if (dbuser)
    {
        keywords[i] = "user";
        values[i] = dbuser;
        i++;
    }
    if (dbport)
    {
        keywords[i] = "port";
        values[i] = dbport;
        i++;
    }
 
    /* If -W was given, force prompt for password, but only the first time */
    need_password = (dbgetpassword == 1 && !password);
 
    do
    {
        /* Get a new password if appropriate */
        if (need_password)
        {
            free(password);
            password = simple_prompt("Password: ", false);
            need_password = false;
        }
 
        /* Use (or reuse, on a subsequent connection) password if we have it */
        if (password)
        {
            keywords[i] = "password";
            values[i] = password;
        }
        else
        {
            keywords[i] = NULL;
            values[i] = NULL;
        }
 
        tmpconn = PQconnectdbParams(keywords, values, true);
 
        /*
         * If there is too little memory even to allocate the PGconn object
         * and PQconnectdbParams returns NULL, we call exit(1) directly.
         */
        if (!tmpconn)
            pg_fatal("could not connect to server");
 
        /* If we need a password and -w wasn't given, loop back and get one */
        if (PQstatus(tmpconn) == CONNECTION_BAD &&
            PQconnectionNeedsPassword(tmpconn) &&
            dbgetpassword != -1)
        {
            PQfinish(tmpconn);
            need_password = true;
        }
    }
    while (need_password);
 
    if (PQstatus(tmpconn) != CONNECTION_OK)
    {
        pg_log_error("%s", PQerrorMessage(tmpconn));
        PQfinish(tmpconn);
        free(values);
        free(keywords);
        PQconninfoFree(conn_opts);
        return NULL;
    }
 
    /* Connection ok! */
    free(values);
    free(keywords);
    PQconninfoFree(conn_opts);
 
    /*
     * Set always-secure search path, so malicious users can't get control.
     * The capacity to run normal SQL queries was added in PostgreSQL 10, so
     * the search path cannot be changed (by us or attackers) on earlier
     * versions.
     */
    if (dbname != NULL && PQserverVersion(tmpconn) >= 100000)
    {
        PGresult   *res;
 
        res = PQexec(tmpconn, ALWAYS_SECURE_SEARCH_PATH_SQL);
        if (PQresultStatus(res) != PGRES_TUPLES_OK)
        {
            pg_log_error("could not clear search_path: %s",
                         PQerrorMessage(tmpconn));
            PQclear(res);
            PQfinish(tmpconn);
            exit(1);
        }
        PQclear(res);
    }
 
    /*
     * Ensure we have the same value of integer_datetimes (now always "on") as
     * the server we are connecting to.
     */
    tmpparam = PQparameterStatus(tmpconn, "integer_datetimes");
    if (!tmpparam)
    {
        pg_log_error("could not determine server setting for integer_datetimes");
        PQfinish(tmpconn);
        exit(1);
    }
 
    if (strcmp(tmpparam, "on") != 0)
    {
        pg_log_error("integer_datetimes compile flag does not match server");
        PQfinish(tmpconn);
        exit(1);
    }
 
    /*
     * Retrieve the source data directory mode and use it to construct a umask
     * for creating directories and files.
     */
    if (!RetrieveDataDirCreatePerm(tmpconn))
    {
        PQfinish(tmpconn);
        exit(1);
    }
 
    return tmpconn;
}

References ALWAYS_SECURE_SEARCH_PATH_SQL, Assert(), CONNECTION_BAD, CONNECTION_OK, connection_string, dbgetpassword, dbhost, dbname, dbport, dbuser, exit(), free, i, _PQconninfoOption::keyword, password, pg_fatal, pg_log_error, pg_malloc0(), PGRES_TUPLES_OK, PQclear(), PQconnectdbParams(), PQconnectionNeedsPassword(), PQconninfoFree(), PQconninfoParse(), PQerrorMessage(), PQexec(), PQfinish(), PQparameterStatus(), PQresultStatus(), PQserverVersion(), PQstatus(), progname, res, RetrieveDataDirCreatePerm(), simple_prompt(), _PQconninfoOption::val, and values.

GetSlotInformation()

bool GetSlotInformation	(	PGconn *	conn,
		const char *	slot_name,
		XLogRecPtr *	restart_lsn,
		TimeLineID *	restart_tli
	)

Definition at line 481 of file streamutil.c.

{
    PGresult   *res;
    PQExpBuffer query;
    XLogRecPtr  lsn_loc = InvalidXLogRecPtr;
    TimeLineID  tli_loc = 0;
 
    if (restart_lsn)
        *restart_lsn = lsn_loc;
    if (restart_tli)
        *restart_tli = tli_loc;
 
    query = createPQExpBuffer();
    appendPQExpBuffer(query, "READ_REPLICATION_SLOT %s", slot_name);
    res = PQexec(conn, query->data);
    destroyPQExpBuffer(query);
 
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        pg_log_error("could not send replication command \"%s\": %s",
                     "READ_REPLICATION_SLOT", PQerrorMessage(conn));
        PQclear(res);
        return false;
    }
 
    /* The command should always return precisely one tuple and three fields */
    if (PQntuples(res) != 1 || PQnfields(res) != 3)
    {
        pg_log_error("could not read replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
                     slot_name, PQntuples(res), PQnfields(res), 1, 3);
        PQclear(res);
        return false;
    }
 
    /*
     * When the slot doesn't exist, the command returns a tuple with NULL
     * values.  This checks only the slot type field.
     */
    if (PQgetisnull(res, 0, 0))
    {
        pg_log_error("replication slot \"%s\" does not exist", slot_name);
        PQclear(res);
        return false;
    }
 
    /*
     * Note that this cannot happen as READ_REPLICATION_SLOT supports only
     * physical slots, but play it safe.
     */
    if (strcmp(PQgetvalue(res, 0, 0), "physical") != 0)
    {
        pg_log_error("expected a physical replication slot, got type \"%s\" instead",
                     PQgetvalue(res, 0, 0));
        PQclear(res);
        return false;
    }
 
    /* restart LSN */
    if (!PQgetisnull(res, 0, 1))
    {
        uint32      hi,
                    lo;
 
        if (sscanf(PQgetvalue(res, 0, 1), "%X/%X", &hi, &lo) != 2)
        {
            pg_log_error("could not parse restart_lsn \"%s\" for replication slot \"%s\"",
                         PQgetvalue(res, 0, 1), slot_name);
            PQclear(res);
            return false;
        }
        lsn_loc = ((uint64) hi) << 32 | lo;
    }
 
    /* current TLI */
    if (!PQgetisnull(res, 0, 2))
        tli_loc = (TimeLineID) atol(PQgetvalue(res, 0, 2));
 
    PQclear(res);
 
    /* Assign results if requested */
    if (restart_lsn)
        *restart_lsn = lsn_loc;
    if (restart_tli)
        *restart_tli = tli_loc;
 
    return true;
}

References appendPQExpBuffer(), conn, createPQExpBuffer(), PQExpBufferData::data, destroyPQExpBuffer(), InvalidXLogRecPtr, pg_log_error, PGRES_TUPLES_OK, PQclear(), PQerrorMessage(), PQexec(), PQgetisnull(), PQgetvalue(), PQnfields(), PQntuples(), PQresultStatus(), and res.

Referenced by StreamLog().

RetrieveDataDirCreatePerm()

static bool RetrieveDataDirCreatePerm ( PGconn *  conn )

static

Definition at line 346 of file streamutil.c.

{
    PGresult   *res;
    int         data_directory_mode;
 
    /* check connection existence */
    Assert(conn != NULL);
 
    /* for previous versions leave the default group access */
    if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_GROUP_ACCESS)
        return true;
 
    res = PQexec(conn, "SHOW data_directory_mode");
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        pg_log_error("could not send replication command \"%s\": %s",
                     "SHOW data_directory_mode", PQerrorMessage(conn));
 
        PQclear(res);
        return false;
    }
    if (PQntuples(res) != 1 || PQnfields(res) < 1)
    {
        pg_log_error("could not fetch group access flag: got %d rows and %d fields, expected %d rows and %d or more fields",
                     PQntuples(res), PQnfields(res), 1, 1);
 
        PQclear(res);
        return false;
    }
 
    if (sscanf(PQgetvalue(res, 0, 0), "%o", &data_directory_mode) != 1)
    {
        pg_log_error("group access flag could not be parsed: %s",
                     PQgetvalue(res, 0, 0));
 
        PQclear(res);
        return false;
    }
 
    SetDataDirectoryCreatePerm(data_directory_mode);
 
    PQclear(res);
    return true;
}

References Assert(), conn, data_directory_mode, MINIMUM_VERSION_FOR_GROUP_ACCESS, pg_log_error, PGRES_TUPLES_OK, PQclear(), PQerrorMessage(), PQexec(), PQgetvalue(), PQnfields(), PQntuples(), PQresultStatus(), PQserverVersion(), res, and SetDataDirectoryCreatePerm().

Referenced by GetConnection().

RetrieveWalSegSize()

bool RetrieveWalSegSize

(

PGconn *

conn

)

Definition at line 268 of file streamutil.c.

{
    PGresult   *res;
    char        xlog_unit[3];
    int         xlog_val,
                multiplier = 1;
 
    /* check connection existence */
    Assert(conn != NULL);
 
    /* for previous versions set the default xlog seg size */
    if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_SHOW_CMD)
    {
        WalSegSz = DEFAULT_XLOG_SEG_SIZE;
        return true;
    }
 
    res = PQexec(conn, "SHOW wal_segment_size");
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        pg_log_error("could not send replication command \"%s\": %s",
                     "SHOW wal_segment_size", PQerrorMessage(conn));
 
        PQclear(res);
        return false;
    }
    if (PQntuples(res) != 1 || PQnfields(res) < 1)
    {
        pg_log_error("could not fetch WAL segment size: got %d rows and %d fields, expected %d rows and %d or more fields",
                     PQntuples(res), PQnfields(res), 1, 1);
 
        PQclear(res);
        return false;
    }
 
    /* fetch xlog value and unit from the result */
    if (sscanf(PQgetvalue(res, 0, 0), "%d%2s", &xlog_val, xlog_unit) != 2)
    {
        pg_log_error("WAL segment size could not be parsed");
        PQclear(res);
        return false;
    }
 
    PQclear(res);
 
    /* set the multiplier based on unit to convert xlog_val to bytes */
    if (strcmp(xlog_unit, "MB") == 0)
        multiplier = 1024 * 1024;
    else if (strcmp(xlog_unit, "GB") == 0)
        multiplier = 1024 * 1024 * 1024;
 
    /* convert and set WalSegSz */
    WalSegSz = xlog_val * multiplier;
 
    if (!IsValidWalSegSize(WalSegSz))
    {
        pg_log_error(ngettext("WAL segment size must be a power of two between 1 MB and 1 GB, but the remote server reported a value of %d byte",
                              "WAL segment size must be a power of two between 1 MB and 1 GB, but the remote server reported a value of %d bytes",
                              WalSegSz),
                     WalSegSz);
        return false;
    }
 
    return true;
}

References Assert(), conn, DEFAULT_XLOG_SEG_SIZE, IsValidWalSegSize, MINIMUM_VERSION_FOR_SHOW_CMD, ngettext, pg_log_error, PGRES_TUPLES_OK, PQclear(), PQerrorMessage(), PQexec(), PQgetvalue(), PQnfields(), PQntuples(), PQresultStatus(), PQserverVersion(), res, and WalSegSz.

Referenced by main().

RunIdentifySystem()

bool RunIdentifySystem	(	PGconn *	conn,
		char **	sysid,
		TimeLineID *	starttli,
		XLogRecPtr *	startpos,
		char **	db_name
	)

Definition at line 400 of file streamutil.c.

{
    PGresult   *res;
    uint32      hi,
                lo;
 
    /* Check connection existence */
    Assert(conn != NULL);
 
    res = PQexec(conn, "IDENTIFY_SYSTEM");
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        pg_log_error("could not send replication command \"%s\": %s",
                     "IDENTIFY_SYSTEM", PQerrorMessage(conn));
 
        PQclear(res);
        return false;
    }
    if (PQntuples(res) != 1 || PQnfields(res) < 3)
    {
        pg_log_error("could not identify system: got %d rows and %d fields, expected %d rows and %d or more fields",
                     PQntuples(res), PQnfields(res), 1, 3);
 
        PQclear(res);
        return false;
    }
 
    /* Get system identifier */
    if (sysid != NULL)
        *sysid = pg_strdup(PQgetvalue(res, 0, 0));
 
    /* Get timeline ID to start streaming from */
    if (starttli != NULL)
        *starttli = atoi(PQgetvalue(res, 0, 1));
 
    /* Get LSN start position if necessary */
    if (startpos != NULL)
    {
        if (sscanf(PQgetvalue(res, 0, 2), "%X/%X", &hi, &lo) != 2)
        {
            pg_log_error("could not parse write-ahead log location \"%s\"",
                         PQgetvalue(res, 0, 2));
 
            PQclear(res);
            return false;
        }
        *startpos = ((uint64) hi) << 32 | lo;
    }
 
    /* Get database name, only available in 9.4 and newer versions */
    if (db_name != NULL)
    {
        *db_name = NULL;
        if (PQserverVersion(conn) >= 90400)
        {
            if (PQnfields(res) < 4)
            {
                pg_log_error("could not identify system: got %d rows and %d fields, expected %d rows and %d or more fields",
                             PQntuples(res), PQnfields(res), 1, 4);
 
                PQclear(res);
                return false;
            }
            if (!PQgetisnull(res, 0, 3))
                *db_name = pg_strdup(PQgetvalue(res, 0, 3));
        }
    }
 
    PQclear(res);
    return true;
}

References Assert(), conn, pg_log_error, pg_strdup(), PGRES_TUPLES_OK, PQclear(), PQerrorMessage(), PQexec(), PQgetisnull(), PQgetvalue(), PQnfields(), PQntuples(), PQresultStatus(), PQserverVersion(), res, and startpos.

Referenced by BaseBackup(), main(), ReceiveXlogStream(), and StreamLog().

Variable Documentation

conn

PGconn* conn = NULL

Definition at line 54 of file streamutil.c.

Referenced by append_db_pattern_cte(), append_rel_pattern_filtered_cte(), append_rel_pattern_raw_cte(), appendQualifiedRelation(), AppendStringCommandOption(), appendStringLiteralConn(), applyRemoteGucs(), BaseBackup(), build_client_final_message(), build_client_first_message(), build_startup_packet(), buildShSecLabels(), check_expected_areq(), check_for_data_types_usage(), check_for_incompatible_polymorphics(), check_for_isn_and_int8_passing_mismatch(), check_for_pg_role_prefix(), check_for_prepared_transactions(), check_for_tables_with_oids(), check_for_user_defined_encoding_conversions(), check_for_user_defined_postfix_ops(), check_is_install_user(), check_loadable_libraries(), check_prepare_conn(), CheckCopyStreamStop(), CheckServerVersionForStreaming(), close_cursor(), closePGconn(), cluster_all_databases(), cluster_one_database(), compile_database_list(), compile_relation_list_one_db(), configure_remote_session(), connect_pg_server(), connectDatabase(), connectDBComplete(), connectDBStart(), connectFailureMessage(), connectMaintenanceDatabase(), connectNoDelay(), connectOptions1(), connectOptions2(), connectToServer(), CopyStreamPoll(), CopyStreamReceive(), create_cursor(), CreateReplicationSlot(), dblink_cancel_query(), dblink_close(), dblink_connect(), dblink_disconnect(), dblink_error_message(), dblink_exec(), dblink_fetch(), dblink_get_conn(), dblink_get_notify(), dblink_is_busy(), dblink_open(), dblink_record_internal(), dblink_res_error(), dblink_security_check(), dblink_send_query(), disconnect_atexit(), disconnectDatabase(), do_sql_command(), do_sql_command_begin(), do_sql_command_end(), doConnect(), dropDBs(), DropReplicationSlot(), dropRoles(), dropTablespaces(), dumpBlobs(), dumpDatabase(), dumpDatabaseConfig(), dumpDatabases(), dumpRoleGUCPrivs(), dumpRoleMembership(), dumpRoles(), dumpTableData_copy(), dumpTablespaces(), dumpUserConfig(), ecpg_raise_backend(), emitHostIdentityInfo(), emitShSecLabels(), estimate_path_cost_size(), executeCommand(), executeMaintenanceCommand(), executeQuery(), executeQueryOrDie(), ExecuteSqlCommand(), exit_nicely(), expand_dbname_patterns(), exportFile(), fetch_more_data(), fillPGconn(), flushAndSendFeedback(), freePGconn(), get_db_conn(), get_db_infos(), get_loadable_libraries(), get_parallel_object_list(), get_rel_infos(), get_remote_estimate(), get_tablespace_paths(), getAnotherTuple(), getCopyDataMessage(), getCopyResult(), getCopyStart(), getHostaddr(), getNotify(), getParamDescriptions(), getParameterStatus(), getReadyForQuery(), getRowDescriptions(), GetSlotInformation(), gss_read(), handleCopyIn(), handleCopyOut(), HandleCopyStream(), HandleEndOfCopyStream(), handleSyncLoss(), importFile(), init_libpq_conn(), init_libpq_source(), initialize_SSL(), internal_ping(), libpq_fetch_file(), libpq_get_current_wal_insert_lsn(), libpq_traverse_files(), libpqrcv_connect(), libpqrcv_create_slot(), libpqrcv_disconnect(), libpqrcv_endstreaming(), libpqrcv_exec(), libpqrcv_get_backend_pid(), libpqrcv_get_conninfo(), libpqrcv_get_senderinfo(), libpqrcv_identify_system(), libpqrcv_readtimelinehistoryfile(), libpqrcv_receive(), libpqrcv_send(), libpqrcv_server_version(), libpqrcv_startstreaming(), lo_close(), lo_creat(), lo_create(), lo_export(), lo_import(), lo_import_internal(), lo_import_with_oid(), lo_initialize(), lo_lseek(), lo_lseek64(), lo_open(), lo_read(), lo_tell(), lo_tell64(), lo_truncate(), lo_truncate64(), lo_unlink(), lo_write(), main(), makeAlterConfigCommand(), makeEmptyPGconn(), materializeResult(), my_SSL_set_fd(), my_truncate(), old_9_6_invalidate_hash_indexes(), open_client_SSL(), openssl_verify_peer_name_matches_certificate_ip(), openssl_verify_peer_name_matches_certificate_name(), overwrite(), ParallelSlotsAdoptConn(), ParallelSlotsTerminate(), parse_int_param(), parseInput(), pg_fe_sendauth(), pg_GSS_error(), pg_GSS_load_servicename(), pg_GSS_read(), pg_GSS_write(), pg_local_sendauth(), pg_password_sendauth(), pg_SASL_continue(), pg_SASL_init(), pgfdw_cancel_query(), pgfdw_exec_cleanup_query(), pgfdw_exec_query(), pgfdw_get_cleanup_result(), pgfdw_get_result(), pgfdw_report_error(), pgpassfileWarning(), pgtls_close(), pgtls_init(), pgtls_open_client(), pgtls_read(), pgtls_read_pending(), pgtls_verify_peer_name_matches_certificate_guts(), pgtls_write(), pickout(), postgresAcquireSampleRowsFunc(), postgresAnalyzeForeignTable(), postgresExecForeignTruncate(), postgresImportForeignSchema(), pq_verify_peer_name_matches_certificate(), pq_verify_peer_name_matches_certificate_ip(), pq_verify_peer_name_matches_certificate_name(), pqAllocCmdQueueEntry(), pqAppendCmdQueueEntry(), PQbackendPID(), pqBuildStartupPacket3(), pqCheckInBufferSpace(), pqCheckOutBufferSpace(), pqClearAsyncResult(), PQclientEncoding(), pqCommandQueueAdvance(), PQconnectdb(), PQconnectdbParams(), PQconnectionNeedsPassword(), PQconnectionUsedPassword(), PQconnectPoll(), PQconnectStart(), PQconnectStartParams(), PQconninfo(), PQconsumeInput(), PQdb(), PQdefaultSSLKeyPassHook_OpenSSL(), PQdescribePortal(), PQdescribePrepared(), pqDropConnection(), pqDropServerData(), PQencryptPasswordConn(), PQendcopy(), pqEndcopy3(), PQenterPipelineMode(), PQerrorMessage(), PQescapeByteaConn(), PQescapeByteaInternal(), PQescapeIdentifier(), PQescapeInternal(), PQescapeLiteral(), PQescapeStringConn(), PQescapeStringInternal(), PQexec(), PQexecFinish(), PQexecParams(), PQexecPrepared(), PQexecStart(), PQexitPipelineMode(), PQfinish(), PQfireResultCreateEvents(), PQflush(), pqFlush(), PQfn(), pqFunctionCall3(), pqGetc(), PQgetCancel(), PQgetCopyData(), pqGetCopyData3(), pqGetErrorNotice3(), PQgetgssctx(), pqGetInt(), PQgetline(), pqGetline3(), PQgetlineAsync(), pqGetlineAsync3(), pqGetnchar(), PQgetResult(), pqGets(), pqGets_append(), pqGets_internal(), PQgetssl(), PQgssEncInUse(), PQhost(), PQhostaddr(), PQinstanceData(), PQisBusy(), PQisnonblocking(), PQmakeEmptyPGresult(), PQnotifies(), PQoptions(), pqPacketSend(), PQparameterStatus(), pqParseInput3(), PQpass(), PQping(), PQpingParams(), pqPipelineFlush(), pqPipelineProcessQueue(), PQpipelineStatus(), PQpipelineSync(), PQport(), PQprepare(), pqPrepareAsyncResult(), PQprotocolVersion(), pqPutc(), PQputCopyData(), PQputCopyEnd(), pqPutInt(), PQputline(), pqPutMsgBytes(), pqPutMsgEnd(), pqPutMsgStart(), PQputnbytes(), pqPutnchar(), pqPuts(), pqReadData(), pqReadReady(), pqRecycleCmdQueueEntry(), PQregisterEventProc(), PQrequestCancel(), PQreset(), PQresetPoll(), PQresetStart(), pqRowProcessor(), pqSaveErrorResult(), pqSaveParameterStatus(), pqSaveWriteError(), pqsecure_close(), pqsecure_initialize(), pqsecure_open_client(), pqsecure_open_gss(), pqsecure_raw_read(), pqsecure_raw_write(), pqsecure_read(), pqsecure_write(), PQsendDescribe(), PQsendDescribePortal(), PQsendDescribePrepared(), PQsendFlushRequest(), PQsendPrepare(), PQsendQuery(), PQsendQueryContinue(), PQsendQueryGuts(), PQsendQueryInternal(), PQsendQueryParams(), PQsendQueryPrepared(), PQsendQueryStart(), pqSendSome(), PQserverVersion(), PQsetClientEncoding(), PQsetdbLogin(), PQsetErrorContextVisibility(), PQsetErrorVerbosity(), PQsetInstanceData(), PQsetnonblocking(), PQsetNoticeProcessor(), PQsetNoticeReceiver(), PQsetSingleRowMode(), PQsetTraceFlags(), pqSkipnchar(), PQsocket(), pqSocketCheck(), PQssl_passwd_cb(), PQsslAttribute(), PQsslInUse(), PQsslStruct(), PQstatus(), PQtrace(), pqTraceOutputMessage(), pqTraceOutputNoTypeByteMessage(), PQtransactionStatus(), PQtty(), PQuntrace(), PQuser(), pqWait(), pqWaitTimed(), pqWriteReady(), prepareToTerminate(), process_result(), ProcessKeepaliveMsg(), processSQLNamePattern(), ProcessXLogDataMsg(), prohibit_crossdb_refs(), read_server_final_message(), read_server_first_message(), ReceiveArchiveStream(), ReceiveBackupManifest(), ReceiveBackupManifestInMemory(), ReceiveCopyData(), ReceiveTarFile(), ReceiveXlogStream(), reindex_all_databases(), reindex_one_database(), release_conn_addrinfo(), report_extension_updates(), RetrieveDataDirCreatePerm(), RetrieveWalSegSize(), run_permutation(), run_reindex_command(), run_simple_command(), run_simple_query(), run_vacuum_command(), RunIdentifySystem(), scram_exchange(), scram_init(), sendFeedback(), sendTerminateConn(), set_archive_cancel_info(), set_frozenxids(), SetCancelConn(), setKeepalivesCount(), setKeepalivesIdle(), setKeepalivesInterval(), setTCPUserTimeout(), setup_connection(), sql_conn(), sql_exec(), sql_exec_dumpalldbs(), sql_exec_dumpalltables(), sql_exec_dumpalltbspc(), sql_exec_searchtables(), start_postmaster(), StartLogStreamer(), storeQueryResult(), StreamLog(), StreamLogicalLog(), stringlist_to_identifierstr(), TableCommandResultHandler(), test_disallowed_in_pipeline(), test_multi_pipelines(), test_nosync(), test_pipeline_abort(), test_pipeline_idle(), test_pipelined_insert(), test_prepared(), test_simple_pipeline(), test_singlerowmode(), test_transaction(), test_uniqviol(), try_complete_step(), useKeepalives(), vacuum_all_databases(), vacuum_one_database(), vacuumlo(), verify_btree_slot_handler(), and verify_heap_slot_handler().

connection_string

char* connection_string = NULL

Definition at line 47 of file streamutil.c.

Referenced by connectDatabase(), GetConnection(), and main().

dbgetpassword

int dbgetpassword = 0

Definition at line 52 of file streamutil.c.

Referenced by GetConnection(), and main().

dbhost

char* dbhost = NULL

Definition at line 48 of file streamutil.c.

Referenced by GetConnection(), and main().

dbname

char* dbname = NULL

Definition at line 51 of file streamutil.c.

Referenced by _reconnectToDB(), AlterDatabaseOwner(), appendPsqlMetaConnect(), AutoVacWorkerMain(), BackgroundWorkerInitializeConnection(), check_db(), cluster_all_databases(), connect_slot(), connectDatabase(), conninfo_uri_parse_options(), convert_database_name(), create_database(), createdb(), do_connect(), drop_database_if_exists(), dropdb(), dropDBs(), dumpDatabaseConfig(), dumpDatabases(), ECPGconnect(), find_matching_idle_slot(), get_database_oid(), GetConnection(), GetDatabaseTuple(), IdentifySystem(), InitPostgres(), log_status_format(), main(), map_sql_catalog_to_xmlschema_types(), map_sql_schema_to_xmlschema_types(), movedb(), objectNamesToOids(), ParallelSlotsGetIdle(), passwordFromFile(), PostgresMain(), PostgresSingleUserMain(), process_postgres_switches(), prohibit_crossdb_refs(), ReconnectToServer(), reindex_all_databases(), and runPgDump().

dbport

char* dbport = NULL

Definition at line 50 of file streamutil.c.

Referenced by GetConnection(), and main().

dbuser

char* dbuser = NULL

Definition at line 49 of file streamutil.c.

Referenced by GetConnection(), and main().

password

char* password = NULL

static

Definition at line 53 of file streamutil.c.

Referenced by AlterRole(), check_password(), ConnectDatabase(), connectDatabase(), conninfo_uri_parse_options(), CreateRole(), do_connect(), doConnect(), encrypt_password(), GetConnection(), main(), pg_be_scram_build_secret(), pg_fe_scram_build_secret(), pg_fe_sendauth(), pg_password_sendauth(), pg_SASL_init(), PQconnectionNeedsPassword(), PQpass(), scram_build_secret(), scram_init(), scram_SaltedPassword(), scram_verify_plain_password(), sql_conn(), and vacuumlo().

progname

const char* progname

Definition at line 46 of file streamutil.c.

Referenced by GetConnection().

WalSegSz

uint32 WalSegSz

Definition at line 34 of file streamutil.c.

Referenced by BootstrapModeMain(), close_walfile(), extractPageMap(), findLastCheckpoint(), FindStreamingStart(), main(), open_walfile(), ProcessXLogDataMsg(), readOneRecord(), ReceiveXlogStream(), RetrieveWalSegSize(), SimpleXLogPageRead(), StartLogStreamer(), and StreamLog().