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dc3eb56383
Extend the FDW API (which we already changed for 9.3) so that an FDW can report whether specific foreign tables are insertable/updatable/deletable. The default assumption continues to be that they're updatable if the relevant executor callback function is supplied by the FDW, but finer granularity is now possible. As a test case, add an "updatable" option to contrib/postgres_fdw. This patch also fixes the information_schema views, which previously did not think that foreign tables were ever updatable, and fixes view_is_auto_updatable() so that a view on a foreign table can be auto-updatable. initdb forced due to changes in information_schema views and the functions they rely on. This is a bit unfortunate to do post-beta1, but if we don't change this now then we'll have another API break for FDWs when we do change it. Dean Rasheed, somewhat editorialized on by Tom Lane
298 lines
7.8 KiB
C
298 lines
7.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* option.c
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* FDW option handling for postgres_fdw
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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/option.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "postgres_fdw.h"
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#include "access/reloptions.h"
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#include "catalog/pg_foreign_server.h"
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#include "catalog/pg_foreign_table.h"
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#include "catalog/pg_user_mapping.h"
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#include "commands/defrem.h"
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/*
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* Describes the valid options for objects that this wrapper uses.
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*/
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typedef struct PgFdwOption
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{
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const char *keyword;
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Oid optcontext; /* OID of catalog in which option may appear */
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bool is_libpq_opt; /* true if it's used in libpq */
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} PgFdwOption;
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/*
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* Valid options for postgres_fdw.
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* Allocated and filled in InitPgFdwOptions.
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*/
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static PgFdwOption *postgres_fdw_options;
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/*
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* Valid options for libpq.
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* Allocated and filled in InitPgFdwOptions.
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*/
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static PQconninfoOption *libpq_options;
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/*
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* Helper functions
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*/
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static void InitPgFdwOptions(void);
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static bool is_valid_option(const char *keyword, Oid context);
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static bool is_libpq_option(const char *keyword);
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/*
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* Validate the generic options given to a FOREIGN DATA WRAPPER, SERVER,
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* USER MAPPING or FOREIGN TABLE that uses postgres_fdw.
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*
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* Raise an ERROR if the option or its value is considered invalid.
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*/
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extern Datum postgres_fdw_validator(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(postgres_fdw_validator);
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Datum
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postgres_fdw_validator(PG_FUNCTION_ARGS)
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{
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List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
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Oid catalog = PG_GETARG_OID(1);
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ListCell *cell;
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/* Build our options lists if we didn't yet. */
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InitPgFdwOptions();
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/*
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* Check that only options supported by postgres_fdw, and allowed for the
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* current object type, are given.
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*/
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foreach(cell, options_list)
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{
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DefElem *def = (DefElem *) lfirst(cell);
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if (!is_valid_option(def->defname, catalog))
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{
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/*
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* Unknown option specified, complain about it. Provide a hint
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* with list of valid options for the object.
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*/
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PgFdwOption *opt;
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StringInfoData buf;
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initStringInfo(&buf);
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for (opt = postgres_fdw_options; opt->keyword; opt++)
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{
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if (catalog == opt->optcontext)
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appendStringInfo(&buf, "%s%s", (buf.len > 0) ? ", " : "",
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opt->keyword);
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}
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ereport(ERROR,
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(errcode(ERRCODE_FDW_INVALID_OPTION_NAME),
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errmsg("invalid option \"%s\"", def->defname),
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errhint("Valid options in this context are: %s",
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buf.data)));
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}
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/*
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* Validate option value, when we can do so without any context.
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*/
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if (strcmp(def->defname, "use_remote_estimate") == 0 ||
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strcmp(def->defname, "updatable") == 0)
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{
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/* these accept only boolean values */
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(void) defGetBoolean(def);
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}
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else if (strcmp(def->defname, "fdw_startup_cost") == 0 ||
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strcmp(def->defname, "fdw_tuple_cost") == 0)
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{
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/* these must have a non-negative numeric value */
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double val;
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char *endp;
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val = strtod(defGetString(def), &endp);
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if (*endp || val < 0)
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("%s requires a non-negative numeric value",
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def->defname)));
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}
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}
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PG_RETURN_VOID();
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}
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/*
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* Initialize option lists.
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*/
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static void
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InitPgFdwOptions(void)
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{
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int num_libpq_opts;
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PQconninfoOption *lopt;
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PgFdwOption *popt;
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/* non-libpq FDW-specific FDW options */
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static const PgFdwOption non_libpq_options[] = {
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{"schema_name", ForeignTableRelationId, false},
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{"table_name", ForeignTableRelationId, false},
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{"column_name", AttributeRelationId, false},
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/* use_remote_estimate is available on both server and table */
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{"use_remote_estimate", ForeignServerRelationId, false},
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{"use_remote_estimate", ForeignTableRelationId, false},
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/* cost factors */
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{"fdw_startup_cost", ForeignServerRelationId, false},
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{"fdw_tuple_cost", ForeignServerRelationId, false},
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/* updatable is available on both server and table */
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{"updatable", ForeignServerRelationId, false},
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{"updatable", ForeignTableRelationId, false},
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{NULL, InvalidOid, false}
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};
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/* Prevent redundant initialization. */
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if (postgres_fdw_options)
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return;
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/*
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* Get list of valid libpq options.
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*
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* To avoid unnecessary work, we get the list once and use it throughout
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* the lifetime of this backend process. We don't need to care about
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* memory context issues, because PQconndefaults allocates with malloc.
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*/
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libpq_options = PQconndefaults();
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if (!libpq_options) /* assume reason for failure is OOM */
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ereport(ERROR,
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(errcode(ERRCODE_FDW_OUT_OF_MEMORY),
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errmsg("out of memory"),
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errdetail("could not get libpq's default connection options")));
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/* Count how many libpq options are available. */
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num_libpq_opts = 0;
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for (lopt = libpq_options; lopt->keyword; lopt++)
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num_libpq_opts++;
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/*
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* Construct an array which consists of all valid options for
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* postgres_fdw, by appending FDW-specific options to libpq options.
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*
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* We use plain malloc here to allocate postgres_fdw_options because it
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* lives as long as the backend process does. Besides, keeping
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* libpq_options in memory allows us to avoid copying every keyword
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* string.
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*/
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postgres_fdw_options = (PgFdwOption *)
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malloc(sizeof(PgFdwOption) * num_libpq_opts +
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sizeof(non_libpq_options));
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if (postgres_fdw_options == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_FDW_OUT_OF_MEMORY),
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errmsg("out of memory")));
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popt = postgres_fdw_options;
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for (lopt = libpq_options; lopt->keyword; lopt++)
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{
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/* Hide debug options, as well as settings we override internally. */
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if (strchr(lopt->dispchar, 'D') ||
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strcmp(lopt->keyword, "fallback_application_name") == 0 ||
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strcmp(lopt->keyword, "client_encoding") == 0)
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continue;
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/* We don't have to copy keyword string, as described above. */
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popt->keyword = lopt->keyword;
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/*
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* "user" and any secret options are allowed only on user mappings.
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* Everything else is a server option.
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*/
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if (strcmp(lopt->keyword, "user") == 0 || strchr(lopt->dispchar, '*'))
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popt->optcontext = UserMappingRelationId;
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else
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popt->optcontext = ForeignServerRelationId;
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popt->is_libpq_opt = true;
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popt++;
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}
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/* Append FDW-specific options and dummy terminator. */
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memcpy(popt, non_libpq_options, sizeof(non_libpq_options));
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}
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/*
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* Check whether the given option is one of the valid postgres_fdw options.
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* context is the Oid of the catalog holding the object the option is for.
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*/
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static bool
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is_valid_option(const char *keyword, Oid context)
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{
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PgFdwOption *opt;
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Assert(postgres_fdw_options); /* must be initialized already */
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for (opt = postgres_fdw_options; opt->keyword; opt++)
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{
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if (context == opt->optcontext && strcmp(opt->keyword, keyword) == 0)
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return true;
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}
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return false;
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}
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/*
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* Check whether the given option is one of the valid libpq options.
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*/
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static bool
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is_libpq_option(const char *keyword)
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{
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PgFdwOption *opt;
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Assert(postgres_fdw_options); /* must be initialized already */
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for (opt = postgres_fdw_options; opt->keyword; opt++)
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{
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if (opt->is_libpq_opt && strcmp(opt->keyword, keyword) == 0)
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return true;
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}
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return false;
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}
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/*
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* Generate key-value arrays which include only libpq options from the
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* given list (which can contain any kind of options). Caller must have
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* allocated large-enough arrays. Returns number of options found.
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*/
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int
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ExtractConnectionOptions(List *defelems, const char **keywords,
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const char **values)
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{
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ListCell *lc;
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int i;
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/* Build our options lists if we didn't yet. */
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InitPgFdwOptions();
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i = 0;
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foreach(lc, defelems)
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{
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DefElem *d = (DefElem *) lfirst(lc);
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if (is_libpq_option(d->defname))
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{
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keywords[i] = d->defname;
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values[i] = defGetString(d);
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i++;
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}
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}
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return i;
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}
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