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eb3d350db3
postgres_fdw tended to say "unknown error" if it tried to execute a command on an already-dead connection, because some paths in libpq just return a null PGresult for such cases. Out-of-memory might result in that, too. To fix, pass the PGconn to pgfdw_report_error, and look at its PQerrorMessage() string if we can't get anything out of the PGresult. Also, fix the transaction-exit logic to reliably drop a dead connection. It was attempting to do that already, but it assumed that only connection cache entries with xact_depth > 0 needed to be examined. The folly in that is that if we fail while issuing START TRANSACTION, we'll not have bumped xact_depth. (At least for the case I was testing, this fix masks the other problem; but it still seems like a good idea to have the PGconn fallback logic.) Per investigation of bug #9087 from Craig Lucas. Backpatch to 9.3 where this code was introduced.
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* postgres_fdw.h
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* Foreign-data wrapper for remote PostgreSQL servers
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*
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* Portions Copyright (c) 2012-2013, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/postgres_fdw/postgres_fdw.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef POSTGRES_FDW_H
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#define POSTGRES_FDW_H
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#include "foreign/foreign.h"
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#include "lib/stringinfo.h"
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#include "nodes/relation.h"
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#include "utils/rel.h"
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#include "libpq-fe.h"
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/* in postgres_fdw.c */
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extern int set_transmission_modes(void);
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extern void reset_transmission_modes(int nestlevel);
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/* in connection.c */
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extern PGconn *GetConnection(ForeignServer *server, UserMapping *user,
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bool will_prep_stmt);
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extern void ReleaseConnection(PGconn *conn);
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extern unsigned int GetCursorNumber(PGconn *conn);
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extern unsigned int GetPrepStmtNumber(PGconn *conn);
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extern void pgfdw_report_error(int elevel, PGresult *res, PGconn *conn,
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bool clear, const char *sql);
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/* in option.c */
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extern int ExtractConnectionOptions(List *defelems,
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const char **keywords,
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const char **values);
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/* in deparse.c */
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extern void classifyConditions(PlannerInfo *root,
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RelOptInfo *baserel,
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List **remote_conds,
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List **local_conds);
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extern bool is_foreign_expr(PlannerInfo *root,
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RelOptInfo *baserel,
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Expr *expr);
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extern void deparseSelectSql(StringInfo buf,
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PlannerInfo *root,
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RelOptInfo *baserel,
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Bitmapset *attrs_used,
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List **retrieved_attrs);
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extern void appendWhereClause(StringInfo buf,
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PlannerInfo *root,
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RelOptInfo *baserel,
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List *exprs,
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bool is_first,
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List **params);
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extern void deparseInsertSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *targetAttrs, List *returningList,
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List **retrieved_attrs);
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extern void deparseUpdateSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *targetAttrs, List *returningList,
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List **retrieved_attrs);
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extern void deparseDeleteSql(StringInfo buf, PlannerInfo *root,
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Index rtindex, Relation rel,
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List *returningList,
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List **retrieved_attrs);
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extern void deparseAnalyzeSizeSql(StringInfo buf, Relation rel);
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extern void deparseAnalyzeSql(StringInfo buf, Relation rel,
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List **retrieved_attrs);
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#endif /* POSTGRES_FDW_H */
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