diff options
Diffstat (limited to 'src/backend/commands/variable.c')
| -rw-r--r-- | src/backend/commands/variable.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c index f8f456e0e5..717bc39c01 100644 --- a/src/backend/commands/variable.c +++ b/src/backend/commands/variable.c @@ -4,6 +4,7 @@ * Routines for handling specialized SET variables. * * + * Portions Copyright (c) 2012-2014, TransLattice, Inc. * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * @@ -23,6 +24,9 @@ #include "access/xact.h" #include "access/xlog.h" #include "catalog/pg_authid.h" +#ifdef XCP +#include "catalog/pgxc_node.h" +#endif #include "commands/variable.h" #include "miscadmin.h" #include "utils/acl.h" @@ -528,7 +532,14 @@ check_XactIsoLevel(char **newval, void **extra, GucSource source) if (strcmp(*newval, "serializable") == 0) { +#ifdef PGXC + /* + * PGXCTODO - PGXC does not support 9.1 serializable transactions yet + */ + newXactIsoLevel = XACT_REPEATABLE_READ; +#else newXactIsoLevel = XACT_SERIALIZABLE; +#endif } else if (strcmp(*newval, "repeatable read") == 0) { @@ -586,6 +597,13 @@ void assign_XactIsoLevel(const char *newval, void *extra) { XactIsoLevel = *((int *) extra); +#ifdef PGXC + /* + * PGXCTODO - PGXC does not support 9.1 serializable transactions yet + */ + if (XactIsoLevel == XACT_SERIALIZABLE) + XactIsoLevel = XACT_REPEATABLE_READ; +#endif } const char * @@ -852,6 +870,135 @@ assign_session_authorization(const char *newval, void *extra) } +#ifdef XCP + +/* + * SET GLOBAL SESSION + */ + +typedef struct +{ + /* This is the "extra" state for GLOBAL SESSION */ + Oid coordid; + int coordpid; +} global_session_extra; + + +bool +check_global_session(char **newval, void **extra, GucSource source) +{ + HeapTuple coordTup; + Oid coordid; + char *separatorPos; + int coordpid; + global_session_extra *myextra; + + /* Do nothing for the boot_val default of NULL */ + if (*newval == NULL) + return true; + + if (strcmp(*newval, "none") == 0) + { + /* hardwired translation */ + coordid = InvalidOid; + coordpid = 0; + } + else + { + if (!IsTransactionState()) + { + /* + * Can't do catalog lookups, so fail. The result of this is that + * global_session cannot be set in postgresql.conf, which seems + * like a good thing anyway, so we don't work hard to avoid it. + */ + return false; + } + + /* + * Get pointer on '_' character separating coordinator name from pid in the + * global session identifier + */ + separatorPos = strrchr(*newval, '_'); + if (separatorPos == NULL) + { + GUC_check_errmsg("malformed Global Session identifier: \"%s\"", *newval); + return false; + } + + /* + * The pid is written immediately after the separator + */ + coordpid = atoi(separatorPos + 1); + if (coordpid <= 0) + { + GUC_check_errmsg("malformed Global Session identifier: \"%s\"", *newval); + return false; + } + + + /* + * Temporary truncate the Global Session identifier to extract session name + */ + *separatorPos = '\0'; + /* Look up the nodename */ + coordTup = SearchSysCache1(PGXCNODENAME, PointerGetDatum(*newval)); + if (!HeapTupleIsValid(coordTup)) + { + *separatorPos = '_'; + GUC_check_errmsg("node \"%s\" does not exist", *newval); + return false; + } + + if (((Form_pgxc_node) GETSTRUCT(coordTup))->node_type != PGXC_NODE_COORDINATOR) + { + ReleaseSysCache(coordTup); + *separatorPos = '_'; + GUC_check_errmsg("node \"%s\" is not a coordinator", *newval); + return false; + } + + coordid = HeapTupleGetOid(coordTup); + + /* + * Save the coordinator name is a global variable so that we don't need + * to do catalog lookups later, especially if we running outside a + * transaction block or in an aborted transaction + */ + if (OidIsValid(coordid)) + strncpy(MyCoordName, *newval, NAMEDATALEN); + + *separatorPos = '_'; + ReleaseSysCache(coordTup); + } + + /* Set up "extra" struct for assign_session_authorization to use */ + myextra = (global_session_extra *) malloc(sizeof(global_session_extra)); + if (!myextra) + return false; + + myextra->coordid = coordid; + myextra->coordpid = coordpid; + *extra = (void *) myextra; + + return true; +} + + +void +assign_global_session(const char *newval, void *extra) +{ + global_session_extra *myextra = (global_session_extra *) extra; + + /* Do nothing for the boot_val default of NULL */ + if (!myextra) + return; + + SetGlobalSession(myextra->coordid, myextra->coordpid); +} +#endif + + /* * SET ROLE * |