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Rearrange dblink's dblink_build_sql_insert() and related routines to open and
lock the target relation just once per SQL function call. The original coding obtained and released lock several times per call. Aside from saving a not-insignificant number of cycles, this eliminates possible race conditions if someone tries to modify the relation's schema concurrently. Also centralize locking and permission-checking logic. Problem noted while investigating a trouble report from Robert Voinea --- his problem is still to be fixed, though.
This commit is contained in:
Tom Lane
parent
47cf87a147
commit
c797279ab7
@ -51,6 +51,7 @@
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#include "tcop/tcopprot.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#include "utils/acl.h"
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#include "utils/array.h"
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#include "utils/lsyscache.h"
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#include "utils/syscache.h"
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@ -74,19 +75,19 @@ static remoteConn *getConnectionByName(const char *name);
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static HTAB *createConnHash(void);
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static void createNewConnection(const char *name, remoteConn * rconn);
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static void deleteConnection(const char *name);
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static char **get_pkey_attnames(Oid relid, int16 *numatts);
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static char *get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals);
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static char *get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char **get_pkey_attnames(Relation rel, int16 *numatts);
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static char *get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals);
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static char *get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
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static char *quote_literal_cstr(char *rawstr);
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static char *quote_ident_cstr(char *rawstr);
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static int16 get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key);
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static HeapTuple get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals);
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static Oid get_relid_from_relname(text *relname_text);
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static char *generate_relation_name(Oid relid);
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static HeapTuple get_tuple_of_interest(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals);
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static Relation get_rel_from_relname(text *relname_text, LOCKMODE lockmode, AclMode aclmode);
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static char *generate_relation_name(Relation rel);
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static char *connstr_strip_password(const char *connstr);
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static void dblink_security_check(PGconn *conn, remoteConn *rconn, const char *connstr);
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static int get_nondropped_natts(Oid relid);
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static int get_nondropped_natts(Relation rel);
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/* Global */
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static remoteConn *pconn = NULL;
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@ -1021,7 +1022,6 @@ Datum
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dblink_get_pkey(PG_FUNCTION_ARGS)
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{
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int16 numatts;
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Oid relid;
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char **results;
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FuncCallContext *funcctx;
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int32 call_cntr;
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@ -1032,7 +1032,8 @@ dblink_get_pkey(PG_FUNCTION_ARGS)
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/* stuff done only on the first call of the function */
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if (SRF_IS_FIRSTCALL())
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{
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TupleDesc tupdesc = NULL;
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Relation rel;
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TupleDesc tupdesc;
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/* create a function context for cross-call persistence */
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funcctx = SRF_FIRSTCALL_INIT();
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@ -1042,13 +1043,13 @@ dblink_get_pkey(PG_FUNCTION_ARGS)
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*/
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
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/* convert relname to rel Oid */
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relid = get_relid_from_relname(PG_GETARG_TEXT_P(0));
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if (!OidIsValid(relid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_TABLE),
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errmsg("relation \"%s\" does not exist",
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GET_STR(PG_GETARG_TEXT_P(0)))));
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/* open target relation */
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rel = get_rel_from_relname(PG_GETARG_TEXT_P(0), AccessShareLock, ACL_SELECT);
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/* get the array of attnums */
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results = get_pkey_attnames(rel, &numatts);
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relation_close(rel, AccessShareLock);
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/*
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* need a tuple descriptor representing one INT and one TEXT column
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@ -1066,9 +1067,6 @@ dblink_get_pkey(PG_FUNCTION_ARGS)
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attinmeta = TupleDescGetAttInMetadata(tupdesc);
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funcctx->attinmeta = attinmeta;
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/* get an array of attnums */
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results = get_pkey_attnames(relid, &numatts);
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if ((results != NULL) && (numatts > 0))
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{
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funcctx->max_calls = numatts;
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@ -1150,7 +1148,7 @@ PG_FUNCTION_INFO_V1(dblink_build_sql_insert);
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Datum
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dblink_build_sql_insert(PG_FUNCTION_ARGS)
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{
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Oid relid;
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Relation rel;
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text *relname_text;
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int2vector *pkattnums;
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int pknumatts_tmp;
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@ -1176,14 +1174,9 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
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relname_text = PG_GETARG_TEXT_P(0);
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/*
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* Convert relname to rel OID.
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* Open target relation.
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*/
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relid = get_relid_from_relname(relname_text);
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if (!OidIsValid(relid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_TABLE),
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errmsg("relation \"%s\" does not exist",
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GET_STR(relname_text))));
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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pknumatts_tmp = PG_GETARG_INT32(2);
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@ -1210,7 +1203,7 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
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* ensure we don't ask for more pk attributes than we have
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* non-dropped columns
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*/
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nondropped_natts = get_nondropped_natts(relid);
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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@ -1284,7 +1277,12 @@ dblink_build_sql_insert(PG_FUNCTION_ARGS)
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/*
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* Prep work is finally done. Go get the SQL string.
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*/
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sql = get_sql_insert(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
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sql = get_sql_insert(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
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/*
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* Now we can close the relation.
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*/
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relation_close(rel, AccessShareLock);
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/*
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* And send it
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@ -1312,7 +1310,7 @@ PG_FUNCTION_INFO_V1(dblink_build_sql_delete);
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Datum
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dblink_build_sql_delete(PG_FUNCTION_ARGS)
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{
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Oid relid;
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Relation rel;
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text *relname_text;
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int2vector *pkattnums;
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int pknumatts_tmp;
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@ -1333,14 +1331,9 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
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relname_text = PG_GETARG_TEXT_P(0);
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/*
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* Convert relname to rel OID.
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* Open target relation.
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*/
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relid = get_relid_from_relname(relname_text);
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if (!OidIsValid(relid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_TABLE),
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errmsg("relation \"%s\" does not exist",
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GET_STR(relname_text))));
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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pknumatts_tmp = PG_GETARG_INT32(2);
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@ -1366,7 +1359,7 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
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* ensure we don't ask for more pk attributes than we have
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* non-dropped columns
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*/
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nondropped_natts = get_nondropped_natts(relid);
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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@ -1407,7 +1400,12 @@ dblink_build_sql_delete(PG_FUNCTION_ARGS)
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/*
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* Prep work is finally done. Go get the SQL string.
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*/
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sql = get_sql_delete(relid, pkattnums, pknumatts, tgt_pkattvals);
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sql = get_sql_delete(rel, pkattnums, pknumatts, tgt_pkattvals);
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/*
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* Now we can close the relation.
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*/
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relation_close(rel, AccessShareLock);
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/*
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* And send it
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@ -1439,7 +1437,7 @@ PG_FUNCTION_INFO_V1(dblink_build_sql_update);
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Datum
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dblink_build_sql_update(PG_FUNCTION_ARGS)
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{
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Oid relid;
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Relation rel;
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text *relname_text;
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int2vector *pkattnums;
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int pknumatts_tmp;
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@ -1465,14 +1463,9 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
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relname_text = PG_GETARG_TEXT_P(0);
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/*
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* Convert relname to rel OID.
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* Open target relation.
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*/
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relid = get_relid_from_relname(relname_text);
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if (!OidIsValid(relid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_TABLE),
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errmsg("relation \"%s\" does not exist",
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GET_STR(relname_text))));
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rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
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pkattnums = (int2vector *) PG_GETARG_POINTER(1);
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pknumatts_tmp = PG_GETARG_INT32(2);
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@ -1499,7 +1492,7 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
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* ensure we don't ask for more pk attributes than we have
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* non-dropped columns
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*/
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nondropped_natts = get_nondropped_natts(relid);
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nondropped_natts = get_nondropped_natts(rel);
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if (pknumatts > nondropped_natts)
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ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("number of primary key fields exceeds number of specified relation attributes")));
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@ -1573,7 +1566,12 @@ dblink_build_sql_update(PG_FUNCTION_ARGS)
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/*
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* Prep work is finally done. Go get the SQL string.
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*/
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sql = get_sql_update(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
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sql = get_sql_update(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
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/*
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* Now we can close the relation.
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*/
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relation_close(rel, AccessShareLock);
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/*
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* And send it
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@ -1607,7 +1605,7 @@ dblink_current_query(PG_FUNCTION_ARGS)
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* Return NULL, and set numatts = 0, if no primary key exists.
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*/
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static char **
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get_pkey_attnames(Oid relid, int16 *numatts)
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get_pkey_attnames(Relation rel, int16 *numatts)
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{
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Relation indexRelation;
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ScanKeyData entry;
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@ -1615,22 +1613,19 @@ get_pkey_attnames(Oid relid, int16 *numatts)
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HeapTuple indexTuple;
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int i;
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char **result = NULL;
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Relation rel;
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TupleDesc tupdesc;
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/* open relation using relid, get tupdesc */
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rel = relation_open(relid, AccessShareLock);
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tupdesc = rel->rd_att;
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/* initialize numatts to 0 in case no primary key exists */
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*numatts = 0;
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tupdesc = rel->rd_att;
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/* use relid to get all related indexes */
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indexRelation = heap_open(IndexRelationId, AccessShareLock);
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ScanKeyInit(&entry,
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Anum_pg_index_indrelid,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(relid));
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ObjectIdGetDatum(RelationGetRelid(rel)));
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scan = heap_beginscan(indexRelation, SnapshotNow, 1, &entry);
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while ((indexTuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
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@ -1653,15 +1648,13 @@ get_pkey_attnames(Oid relid, int16 *numatts)
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}
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heap_endscan(scan);
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heap_close(indexRelation, AccessShareLock);
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relation_close(rel, AccessShareLock);
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return result;
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}
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static char *
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get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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get_sql_insert(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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{
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Relation rel;
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char *relname;
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HeapTuple tuple;
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TupleDesc tupdesc;
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@ -1674,16 +1667,12 @@ get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pka
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bool needComma;
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/* get relation name including any needed schema prefix and quoting */
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relname = generate_relation_name(relid);
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relname = generate_relation_name(rel);
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/*
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* Open relation using relid
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*/
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rel = relation_open(relid, AccessShareLock);
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tupdesc = rel->rd_att;
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natts = tupdesc->natts;
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tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
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tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
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if (!tuple)
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ereport(ERROR,
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(errcode(ERRCODE_CARDINALITY_VIOLATION),
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@ -1743,15 +1732,13 @@ get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pka
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sql = pstrdup(str->data);
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pfree(str->data);
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pfree(str);
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relation_close(rel, AccessShareLock);
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return (sql);
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}
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static char *
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get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals)
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get_sql_delete(Relation rel, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals)
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{
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Relation rel;
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char *relname;
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TupleDesc tupdesc;
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int natts;
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@ -1761,12 +1748,8 @@ get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pka
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int i;
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/* get relation name including any needed schema prefix and quoting */
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relname = generate_relation_name(relid);
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relname = generate_relation_name(rel);
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/*
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* Open relation using relid
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*/
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rel = relation_open(relid, AccessShareLock);
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tupdesc = rel->rd_att;
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natts = tupdesc->natts;
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@ -1799,15 +1782,13 @@ get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pka
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sql = pstrdup(str->data);
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pfree(str->data);
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pfree(str);
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relation_close(rel, AccessShareLock);
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return (sql);
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}
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static char *
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get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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get_sql_update(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
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{
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Relation rel;
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char *relname;
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HeapTuple tuple;
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TupleDesc tupdesc;
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@ -1820,16 +1801,12 @@ get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pka
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bool needComma;
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/* get relation name including any needed schema prefix and quoting */
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relname = generate_relation_name(relid);
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relname = generate_relation_name(rel);
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/*
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* Open relation using relid
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*/
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rel = relation_open(relid, AccessShareLock);
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tupdesc = rel->rd_att;
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natts = tupdesc->natts;
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tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
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tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
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if (!tuple)
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ereport(ERROR,
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(errcode(ERRCODE_CARDINALITY_VIOLATION),
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@ -1898,7 +1875,6 @@ get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pka
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sql = pstrdup(str->data);
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pfree(str->data);
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pfree(str);
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relation_close(rel, AccessShareLock);
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return (sql);
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}
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@ -1955,9 +1931,8 @@ get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key)
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}
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static HeapTuple
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get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals)
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get_tuple_of_interest(Relation rel, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals)
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{
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Relation rel;
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char *relname;
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TupleDesc tupdesc;
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StringInfo str = makeStringInfo();
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@ -1968,14 +1943,9 @@ get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **
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char *val = NULL;
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|
||||
/* get relation name including any needed schema prefix and quoting */
|
||||
relname = generate_relation_name(relid);
|
||||
relname = generate_relation_name(rel);
|
||||
|
||||
/*
|
||||
* Open relation using relid
|
||||
*/
|
||||
rel = relation_open(relid, AccessShareLock);
|
||||
tupdesc = CreateTupleDescCopy(rel->rd_att);
|
||||
relation_close(rel, AccessShareLock);
|
||||
tupdesc = rel->rd_att;
|
||||
|
||||
/*
|
||||
* Connect to SPI manager
|
||||
@ -2053,52 +2023,49 @@ get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static Oid
|
||||
get_relid_from_relname(text *relname_text)
|
||||
/*
|
||||
* Open the relation named by relname_text, acquire specified type of lock,
|
||||
* verify we have specified permissions.
|
||||
* Caller must close rel when done with it.
|
||||
*/
|
||||
static Relation
|
||||
get_rel_from_relname(text *relname_text, LOCKMODE lockmode, AclMode aclmode)
|
||||
{
|
||||
RangeVar *relvar;
|
||||
Relation rel;
|
||||
Oid relid;
|
||||
AclResult aclresult;
|
||||
|
||||
relvar = makeRangeVarFromNameList(textToQualifiedNameList(relname_text));
|
||||
rel = heap_openrv(relvar, AccessShareLock);
|
||||
relid = RelationGetRelid(rel);
|
||||
relation_close(rel, AccessShareLock);
|
||||
rel = heap_openrv(relvar, lockmode);
|
||||
|
||||
return relid;
|
||||
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
|
||||
aclmode);
|
||||
if (aclresult != ACLCHECK_OK)
|
||||
aclcheck_error(aclresult, ACL_KIND_CLASS,
|
||||
RelationGetRelationName(rel));
|
||||
|
||||
return rel;
|
||||
}
|
||||
|
||||
/*
|
||||
* generate_relation_name - copied from ruleutils.c
|
||||
* Compute the name to display for a relation specified by OID
|
||||
* Compute the name to display for a relation
|
||||
*
|
||||
* The result includes all necessary quoting and schema-prefixing.
|
||||
*/
|
||||
static char *
|
||||
generate_relation_name(Oid relid)
|
||||
generate_relation_name(Relation rel)
|
||||
{
|
||||
HeapTuple tp;
|
||||
Form_pg_class reltup;
|
||||
char *nspname;
|
||||
char *result;
|
||||
|
||||
tp = SearchSysCache(RELOID,
|
||||
ObjectIdGetDatum(relid),
|
||||
0, 0, 0);
|
||||
if (!HeapTupleIsValid(tp))
|
||||
elog(ERROR, "cache lookup failed for relation %u", relid);
|
||||
|
||||
reltup = (Form_pg_class) GETSTRUCT(tp);
|
||||
|
||||
/* Qualify the name if not visible in search path */
|
||||
if (RelationIsVisible(relid))
|
||||
if (RelationIsVisible(RelationGetRelid(rel)))
|
||||
nspname = NULL;
|
||||
else
|
||||
nspname = get_namespace_name(reltup->relnamespace);
|
||||
nspname = get_namespace_name(rel->rd_rel->relnamespace);
|
||||
|
||||
result = quote_qualified_identifier(nspname, NameStr(reltup->relname));
|
||||
|
||||
ReleaseSysCache(tp);
|
||||
result = quote_qualified_identifier(nspname, RelationGetRelationName(rel));
|
||||
|
||||
return result;
|
||||
}
|
||||
@ -2342,15 +2309,13 @@ dblink_security_check(PGconn *conn, remoteConn *rconn, const char *connstr)
|
||||
}
|
||||
|
||||
static int
|
||||
get_nondropped_natts(Oid relid)
|
||||
get_nondropped_natts(Relation rel)
|
||||
{
|
||||
int nondropped_natts = 0;
|
||||
TupleDesc tupdesc;
|
||||
Relation rel;
|
||||
int natts;
|
||||
int i;
|
||||
|
||||
rel = relation_open(relid, AccessShareLock);
|
||||
tupdesc = rel->rd_att;
|
||||
natts = tupdesc->natts;
|
||||
|
||||
@ -2361,7 +2326,6 @@ get_nondropped_natts(Oid relid)
|
||||
nondropped_natts++;
|
||||
}
|
||||
|
||||
relation_close(rel, AccessShareLock);
|
||||
return nondropped_natts;
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user