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redis_fdw.c
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redis_fdw.c
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/*-------------------------------------------------------------------------
*
* foreign-data wrapper for Redis
*
* Copyright (c) 2011,2013 PostgreSQL Global Development Group
*
* This software is released under the PostgreSQL Licence
*
* Authors: Dave Page <dpage@pgadmin.org>
* Andrew Dunstan <andrew@dunslane.net>
*
* IDENTIFICATION
* redis_fdw/redis_fdw.c
*
*-------------------------------------------------------------------------
*/
/* Debug mode */
/* #define DEBUG */
#include "postgres.h"
/* check that we are compiling for the right postgres version */
#if PG_VERSION_NUM < 180000
#error wrong Postgresql version this branch is only for 18.
#endif
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <hiredis/hiredis.h>
#include "funcapi.h"
#include "access/reloptions.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_user_mapping.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "commands/explain.h"
#include "foreign/fdwapi.h"
#include "foreign/foreign.h"
#include "miscadmin.h"
#include "mb/pg_wchar.h"
#include "nodes/pathnodes.h"
#include "nodes/makefuncs.h"
#include "nodes/parsenodes.h"
#include "optimizer/appendinfo.h"
#include "optimizer/inherit.h"
#include "optimizer/optimizer.h"
#include "optimizer/pathnode.h"
#include "optimizer/planmain.h"
#include "optimizer/restrictinfo.h"
#include "parser/parsetree.h"
#include "storage/fd.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
PG_MODULE_MAGIC;
#define PROCID_TEXTEQ 67
/*
* Describes the valid options for objects that use this wrapper.
*/
struct RedisFdwOption
{
const char *optname;
Oid optcontext; /* Oid of catalog in which option may appear */
};
/*
* Valid options for redis_fdw.
*
*/
static struct RedisFdwOption valid_options[] =
{
/* Connection options */
{"address", ForeignServerRelationId},
{"port", ForeignServerRelationId},
{"password", UserMappingRelationId},
{"database", ForeignTableRelationId},
/* table options */
{"singleton_key", ForeignTableRelationId},
{"tablekeyprefix", ForeignTableRelationId},
{"tablekeyset", ForeignTableRelationId},
{"tabletype", ForeignTableRelationId},
/* Sentinel */
{NULL, InvalidOid}
};
typedef enum
{
PG_REDIS_SCALAR_TABLE = 0,
PG_REDIS_HASH_TABLE,
PG_REDIS_LIST_TABLE,
PG_REDIS_SET_TABLE,
PG_REDIS_ZSET_TABLE
} redis_table_type;
typedef struct redisTableOptions
{
char *address;
int port;
char *password;
int database;
char *keyprefix;
char *keyset;
char *singleton_key;
redis_table_type table_type;
} redisTableOptions;
typedef struct
{
char *svr_address;
int svr_port;
char *svr_password;
int svr_database;
} RedisFdwPlanState;
/*
* FDW-specific information for ForeignScanState.fdw_state.
*/
typedef struct RedisFdwExecutionState
{
AttInMetadata *attinmeta;
redisContext *context;
redisReply *reply;
long long row;
char *address;
int port;
char *password;
int database;
char *keyprefix;
char *keyset;
char *qual_value;
char *singleton_key;
redis_table_type table_type;
char *cursor_search_string;
char *cursor_id;
MemoryContext mctxt;
} RedisFdwExecutionState;
typedef struct RedisFdwModifyState
{
redisContext *context;
char *address;
int port;
char *password;
int database;
char *keyprefix;
char *keyset;
char *qual_value;
char *singleton_key;
Relation rel;
redis_table_type table_type;
List *target_attrs;
int *targetDims;
int p_nums;
int keyAttno;
Oid array_elem_type;
FmgrInfo *p_flinfo;
} RedisFdwModifyState;
/* initial cursor */
#define ZERO "0"
/* redis default is 10 - let's fetch 1000 at a time */
#define COUNT " COUNT 1000"
/*
* SQL functions
*/
extern Datum redis_fdw_handler(PG_FUNCTION_ARGS);
extern Datum redis_fdw_validator(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(redis_fdw_handler);
PG_FUNCTION_INFO_V1(redis_fdw_validator);
/*
* FDW callback routines
*/
static void redisGetForeignRelSize(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid);
static void redisGetForeignPaths(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid);
static ForeignScan *redisGetForeignPlan(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid,
ForeignPath *best_path,
List *tlist,
List *scan_clauses,
Plan *outer_plan);
static void redisExplainForeignScan(ForeignScanState *node, ExplainState *es);
static void redisBeginForeignScan(ForeignScanState *node, int eflags);
static TupleTableSlot *redisIterateForeignScan(ForeignScanState *node);
static inline TupleTableSlot *redisIterateForeignScanMulti(ForeignScanState *node);
static inline TupleTableSlot *redisIterateForeignScanSingleton(ForeignScanState *node);
static void redisReScanForeignScan(ForeignScanState *node);
static void redisEndForeignScan(ForeignScanState *node);
static List *redisPlanForeignModify(PlannerInfo *root,
ModifyTable *plan,
Index resultRelation,
int subplan_index);
static void redisBeginForeignModify(ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
int eflags);
static TupleTableSlot *redisExecForeignInsert(EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static void redisEndForeignModify(EState *estate,
ResultRelInfo *rinfo);
static void redisAddForeignUpdateTargets(PlannerInfo *root,
Index rtindex,
RangeTblEntry *target_rte,
Relation target_relation);
static TupleTableSlot *redisExecForeignDelete(EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static TupleTableSlot *redisExecForeignUpdate(EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
/*
* Helper functions
*/
static bool redisIsValidOption(const char *option, Oid context);
static void redisGetOptions(Oid foreigntableid, redisTableOptions *options);
static void redisGetQual(Node *node, TupleDesc tupdesc, char **key,
char **value, bool *pushdown);
static char *process_redis_array(redisReply *reply, redis_table_type type);
static void check_reply(redisReply *reply, redisContext *context,
int error_code, char *message, char *arg);
/*
* Name we will use for the junk attribute that holds the redis key
* for update and delete operations.
*/
#define REDISMODKEYNAME "__redis_mod_key_name"
/*
* Foreign-data wrapper handler function: return a struct with pointers
* to my callback routines.
*/
Datum
redis_fdw_handler(PG_FUNCTION_ARGS)
{
FdwRoutine *fdwroutine = makeNode(FdwRoutine);
#ifdef DEBUG
elog(NOTICE, "redis_fdw_handler");
#endif
fdwroutine->GetForeignRelSize = redisGetForeignRelSize;
fdwroutine->GetForeignPaths = redisGetForeignPaths;
fdwroutine->GetForeignPlan = redisGetForeignPlan;
/* can't ANALYSE redis */
fdwroutine->AnalyzeForeignTable = NULL;
fdwroutine->ExplainForeignScan = redisExplainForeignScan;
fdwroutine->BeginForeignScan = redisBeginForeignScan;
fdwroutine->IterateForeignScan = redisIterateForeignScan;
fdwroutine->ReScanForeignScan = redisReScanForeignScan;
fdwroutine->EndForeignScan = redisEndForeignScan;
fdwroutine->PlanForeignModify = redisPlanForeignModify; /* I U D */
fdwroutine->BeginForeignModify = redisBeginForeignModify; /* I U D */
fdwroutine->ExecForeignInsert = redisExecForeignInsert; /* I */
fdwroutine->EndForeignModify = redisEndForeignModify; /* I U D */
fdwroutine->ExecForeignUpdate = redisExecForeignUpdate; /* U */
fdwroutine->ExecForeignDelete = redisExecForeignDelete; /* D */
fdwroutine->AddForeignUpdateTargets = redisAddForeignUpdateTargets; /* U D */
PG_RETURN_POINTER(fdwroutine);
}
/*
* Validate the generic options given to a FOREIGN DATA WRAPPER, SERVER,
* USER MAPPING or FOREIGN TABLE that uses file_fdw.
*
* Raise an ERROR if the option or its value is considered invalid.
*/
Datum
redis_fdw_validator(PG_FUNCTION_ARGS)
{
List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
Oid catalog = PG_GETARG_OID(1);
char *svr_address = NULL;
int svr_port = 0;
char *svr_password = NULL;
int svr_database = 0;
redis_table_type tabletype = PG_REDIS_SCALAR_TABLE;
char *tablekeyprefix = NULL;
char *tablekeyset = NULL;
char *singletonkey = NULL;
ListCell *cell;
#ifdef DEBUG
elog(NOTICE, "redis_fdw_validator");
#endif
/*
* Check that only options supported by redis_fdw, and allowed for the
* current object type, are given.
*/
foreach(cell, options_list)
{
DefElem *def = (DefElem *) lfirst(cell);
if (!redisIsValidOption(def->defname, catalog))
{
struct RedisFdwOption *opt;
StringInfoData buf;
/*
* Unknown option specified, complain about it. Provide a hint
* with list of valid options for the object.
*/
initStringInfo(&buf);
for (opt = valid_options; opt->optname; opt++)
{
if (catalog == opt->optcontext)
appendStringInfo(&buf, "%s%s", (buf.len > 0) ? ", " : "",
opt->optname);
}
ereport(ERROR,
(errcode(ERRCODE_FDW_INVALID_OPTION_NAME),
errmsg("invalid option \"%s\"", def->defname),
errhint("Valid options in this context are: %s",
buf.len ? buf.data : "<none>")
));
}
if (strcmp(def->defname, "address") == 0)
{
if (svr_address)
ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: "
"address (%s)", defGetString(def))
));
svr_address = defGetString(def);
}
else if (strcmp(def->defname, "port") == 0)
{
if (svr_port)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: port (%s)",
defGetString(def))
));
svr_port = atoi(defGetString(def));
}
if (strcmp(def->defname, "password") == 0)
{
if (svr_password)
ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: password")
));
svr_password = defGetString(def);
}
else if (strcmp(def->defname, "database") == 0)
{
if (svr_database)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: database "
"(%s)", defGetString(def))
));
svr_database = atoi(defGetString(def));
}
else if (strcmp(def->defname, "singleton_key ") == 0)
{
if (tablekeyset)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: tablekeyset(%s) and "
"singleton_key (%s)", tablekeyset,
defGetString(def))
));
if (tablekeyprefix)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: tablekeyprefix(%s) and "
"singleton_key (%s)", tablekeyprefix,
defGetString(def))
));
if (singletonkey)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: "
"singleton_key (%s)", defGetString(def))
));
singletonkey = defGetString(def);
}
else if (strcmp(def->defname, "tablekeyprefix") == 0)
{
if (tablekeyset)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: tablekeyset(%s) and "
"tablekeyprefix (%s)", tablekeyset,
defGetString(def))
));
if (singletonkey)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: singleton_key(%s) and "
"tablekeyprefix (%s)", singletonkey,
defGetString(def))
));
if (tablekeyprefix)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: "
"tablekeyprefix (%s)", defGetString(def))
));
tablekeyprefix = defGetString(def);
}
else if (strcmp(def->defname, "tablekeyset") == 0)
{
if (tablekeyprefix)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: tablekeyprefix (%s) and "
"tablekeyset (%s)", tablekeyprefix,
defGetString(def))
));
if (singletonkey)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting options: singleton_key(%s) and "
"tablekeyset (%s)", singletonkey,
defGetString(def))
));
if (tablekeyset)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: "
"tablekeyset (%s)", defGetString(def))
));
tablekeyset = defGetString(def);
}
else if (strcmp(def->defname, "tabletype") == 0)
{
char *typeval = defGetString(def);
if (tabletype)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options: tabletype "
"(%s)", typeval)));
if (strcmp(typeval, "hash") == 0)
tabletype = PG_REDIS_HASH_TABLE;
else if (strcmp(typeval, "list") == 0)
tabletype = PG_REDIS_LIST_TABLE;
else if (strcmp(typeval, "set") == 0)
tabletype = PG_REDIS_SET_TABLE;
else if (strcmp(typeval, "zset") == 0)
tabletype = PG_REDIS_ZSET_TABLE;
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid tabletype (%s) - must be hash, "
"list, set or zset", typeval)));
}
}
PG_RETURN_VOID();
}
/*
* Check if the provided option is one of the valid options.
* context is the Oid of the catalog holding the object the option is for.
*/
static bool
redisIsValidOption(const char *option, Oid context)
{
struct RedisFdwOption *opt;
#ifdef DEBUG
elog(NOTICE, "redisIsValidOption");
#endif
for (opt = valid_options; opt->optname; opt++)
{
if (context == opt->optcontext && strcmp(opt->optname, option) == 0)
return true;
}
return false;
}
/*
* Fetch the options for a redis_fdw foreign table.
*/
static void
redisGetOptions(Oid foreigntableid, redisTableOptions *table_options)
{
ForeignTable *table;
ForeignServer *server;
UserMapping *mapping;
List *options;
ListCell *lc;
#ifdef DEBUG
elog(NOTICE, "redisGetOptions");
#endif
/*
* Extract options from FDW objects. We only need to worry about server
* options for Redis
*
*/
table = GetForeignTable(foreigntableid);
server = GetForeignServer(table->serverid);
mapping = GetUserMapping(GetUserId(), table->serverid);
options = NIL;
options = list_concat(options, table->options);
options = list_concat(options, server->options);
options = list_concat(options, mapping->options);
/* Loop through the options, and get the server/port */
foreach(lc, options)
{
DefElem *def = (DefElem *) lfirst(lc);
if (strcmp(def->defname, "address") == 0)
table_options->address = defGetString(def);
if (strcmp(def->defname, "port") == 0)
table_options->port = atoi(defGetString(def));
if (strcmp(def->defname, "password") == 0)
table_options->password = defGetString(def);
if (strcmp(def->defname, "database") == 0)
table_options->database = atoi(defGetString(def));
if (strcmp(def->defname, "tablekeyprefix") == 0)
table_options->keyprefix = defGetString(def);
if (strcmp(def->defname, "tablekeyset") == 0)
table_options->keyset = defGetString(def);
if (strcmp(def->defname, "singleton_key") == 0)
table_options->singleton_key = defGetString(def);
if (strcmp(def->defname, "tabletype") == 0)
{
char *typeval = defGetString(def);
if (strcmp(typeval, "hash") == 0)
table_options->table_type = PG_REDIS_HASH_TABLE;
else if (strcmp(typeval, "list") == 0)
table_options->table_type = PG_REDIS_LIST_TABLE;
else if (strcmp(typeval, "set") == 0)
table_options->table_type = PG_REDIS_SET_TABLE;
else if (strcmp(typeval, "zset") == 0)
table_options->table_type = PG_REDIS_ZSET_TABLE;
/* XXX detect error here */
}
}
/* Default values, if required */
if (!table_options->address)
table_options->address = "127.0.0.1";
if (!table_options->port)
table_options->port = 6379;
if (!table_options->database)
table_options->database = 0;
}
static void
redisGetForeignRelSize(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid)
{
RedisFdwPlanState *fdw_private;
redisTableOptions table_options;
redisContext *context;
redisReply *reply;
struct timeval timeout = {1, 500000};
#ifdef DEBUG
elog(NOTICE, "redisGetForeignRelSize");
#endif
/*
* Fetch options. Get everything so we don't need to re-fetch it later in
* planning.
*/
fdw_private = (RedisFdwPlanState *) palloc(sizeof(RedisFdwPlanState));
baserel->fdw_private = (void *) fdw_private;
table_options.address = NULL;
table_options.port = 0;
table_options.password = NULL;
table_options.database = 0;
table_options.keyprefix = NULL;
table_options.keyset = NULL;
table_options.singleton_key = NULL;
table_options.table_type = PG_REDIS_SCALAR_TABLE;
redisGetOptions(foreigntableid, &table_options);
fdw_private->svr_address = table_options.address;
fdw_private->svr_password = table_options.password;
fdw_private->svr_port = table_options.port;
fdw_private->svr_database = table_options.database;
/* Connect to the database */
context = redisConnectWithTimeout(table_options.address, table_options.port,
timeout);
if (context->err)
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to connect to Redis: %d", context->err)
));
/* Authenticate */
if (table_options.password)
{
reply = redisCommand(context, "AUTH %s", table_options.password);
if (!reply)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to authenticate to redis: %d",
context->err)));
}
freeReplyObject(reply);
}
/* Select the appropriate database */
reply = redisCommand(context, "SELECT %d", table_options.database);
if (!reply)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to select database %d: %d",
table_options.database, context->err)
));
}
/* Execute a query to get the table size */
#if 0
/*
* KEYS is potentiallyexpensive, so this test is disabled and we use a
* fairly dubious heuristic instead.
*/
if (table_options.keyprefix)
{
/* it's a pity there isn't an NKEYS command in Redis */
int len = strlen(table_options.keyprefix) + 2;
char *buff = palloc(len * sizeof(char));
snprintf(buff, len, "%s*", table_options.keyprefix);
reply = redisCommand(context, "KEYS %s", buff);
}
else
#endif
if (table_options.singleton_key)
{
switch (table_options.table_type)
{
case PG_REDIS_SCALAR_TABLE:
baserel->rows = 1;
return;
case PG_REDIS_HASH_TABLE:
reply = redisCommand(context, "HLEN %s", table_options.singleton_key);
break;
case PG_REDIS_LIST_TABLE:
reply = redisCommand(context, "LLEN %s", table_options.singleton_key);
break;
case PG_REDIS_SET_TABLE:
reply = redisCommand(context, "SCARD %s", table_options.singleton_key);
break;
case PG_REDIS_ZSET_TABLE:
reply = redisCommand(context, "ZCARD %s", table_options.singleton_key);
break;
default:
;
}
}
else if (table_options.keyset)
{
reply = redisCommand(context, "SCARD %s", table_options.keyset);
}
else
{
reply = redisCommand(context, "DBSIZE");
}
if (!reply)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to get the database size: %d", context->err)
));
}
#if 0
if (reply->type == REDIS_REPLY_ARRAY)
baserel->rows = reply->elements;
else
#endif
if (table_options.keyprefix)
baserel->rows = reply->integer / 20;
else
baserel->rows = reply->integer;
freeReplyObject(reply);
redisFree(context);
}
/*
* redisGetForeignPaths
* Create possible access paths for a scan on the foreign table
*
* Currently we don't support any push-down feature, so there is only one
* possible access path, which simply returns all records in redis.
*/
static void
redisGetForeignPaths(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid)
{
RedisFdwPlanState *fdw_private = baserel->fdw_private;
Cost startup_cost,
total_cost;
#ifdef DEBUG
elog(NOTICE, "redisGetForeignPaths");
#endif
if (strcmp(fdw_private->svr_address, "127.0.0.1") == 0 ||
strcmp(fdw_private->svr_address, "localhost") == 0)
startup_cost = 10;
else
startup_cost = 25;
total_cost = startup_cost + baserel->rows;
/* Create a ForeignPath node and add it as only possible path */
add_path(baserel, (Path *)
create_foreignscan_path(root, baserel,
NULL, /* default pathtarget */
baserel->rows,
0, /* no disabled nodes */
startup_cost,
total_cost,
NIL, /* no pathkeys */
NULL, /* no outer rel either */
NULL, /* no extra plan */
NIL, /* no fdw_restrictinfo list */
NIL)); /* no fdw_private data */
}
static ForeignScan *
redisGetForeignPlan(PlannerInfo *root,
RelOptInfo *baserel,
Oid foreigntableid,
ForeignPath *best_path,
List *tlist,
List *scan_clauses,
Plan *outer_plan)
{
Index scan_relid = baserel->relid;
#ifdef DEBUG
elog(NOTICE, "redisGetForeignPlan");
#endif
/*
* We have no native ability to evaluate restriction clauses, so we just
* put all the scan_clauses into the plan node's qual list for the
* executor to check. So all we have to do here is strip RestrictInfo
* nodes from the clauses and ignore pseudoconstants (which will be
* handled elsewhere).
*/
scan_clauses = extract_actual_clauses(scan_clauses, false);
/* Create the ForeignScan node */
return make_foreignscan(tlist,
scan_clauses,
scan_relid,
NIL, /* no expressions to evaluate */
NIL, /* no private state either */
NIL, /* no custom tlist */
NIL, /* no remote quals */
outer_plan);
}
/*
* fileExplainForeignScan
* Produce extra output for EXPLAIN
*/
static void
redisExplainForeignScan(ForeignScanState *node, ExplainState *es)
{
redisReply *reply;
RedisFdwExecutionState *festate = (RedisFdwExecutionState *) node->fdw_state;
#ifdef DEBUG
elog(NOTICE, "redisExplainForeignScan");
#endif
if (!es->costs)
return;
/*
* Execute a query to get the table size
*
* See above for more details.
*/
if (festate->keyset)
{
reply = redisCommand(festate->context, "SCARD %s", festate->keyset);
}
else
{
reply = redisCommand(festate->context, "DBSIZE");
}
if (!reply)
{
redisFree(festate->context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to get the table size: %d", festate->context->err)
));
}
if (reply->type == REDIS_REPLY_ERROR)
{
char *err = pstrdup(reply->str);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to get the table size: %s", err)
));
}
ExplainPropertyInteger("Foreign Redis Table Size", "b",
festate->keyprefix ? reply->integer / 20 :
reply->integer,
es);
freeReplyObject(reply);
}
/*
* redisBeginForeignScan
* Initiate access to the database
*/
static void
redisBeginForeignScan(ForeignScanState *node, int eflags)
{
redisTableOptions table_options;
redisContext *context;
redisReply *reply;
char *qual_key = NULL;
char *qual_value = NULL;
bool pushdown = false;
RedisFdwExecutionState *festate;
struct timeval timeout = {1, 500000};
#ifdef DEBUG
elog(NOTICE, "BeginForeignScan");
#endif
table_options.address = NULL;
table_options.port = 0;
table_options.password = NULL;
table_options.database = 0;
table_options.keyprefix = NULL;
table_options.keyset = NULL;
table_options.singleton_key = NULL;
table_options.table_type = PG_REDIS_SCALAR_TABLE;
/* Fetch options */
redisGetOptions(RelationGetRelid(node->ss.ss_currentRelation),
&table_options);
/* Connect to the server */
context = redisConnectWithTimeout(table_options.address,
table_options.port, timeout);
if (context->err)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to connect to Redis: %s", context->errstr)
));
}
/* Authenticate */
if (table_options.password)
{
reply = redisCommand(context, "AUTH %s", table_options.password);
if (!reply)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to authenticate to redis: %s", context->errstr)
));
}
freeReplyObject(reply);
}
/* Select the appropriate database */
reply = redisCommand(context, "SELECT %d", table_options.database);
if (!reply)
{
redisFree(context);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to select database %d: %s",
table_options.database, context->errstr)
));
}
if (reply->type == REDIS_REPLY_ERROR)
{
char *err = pstrdup(reply->str);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_ESTABLISH_CONNECTION),
errmsg("failed to select database %d: %s",
table_options.database, err)
));
}
freeReplyObject(reply);
/* See if we've got a qual we can push down */
if (node->ss.ps.plan->qual)
{
ListCell *lc;
foreach(lc, node->ss.ps.plan->qual)
{
/* Only the first qual can be pushed down to Redis */