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redis_fdw.c
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/*-------------------------------------------------------------------------
*
* Foreign-data wrapper for Redis
*
* Copyright (c) 2015 Leon Dang, Nahanni Systems Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* MODULE IDENTIFICATION
* redis_fdw/redis_fdw.c
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <hiredis/hiredis.h>
#include "postgres.h"
#include "funcapi.h"
#include "access/htup_details.h"
#include "access/reloptions.h"
#include "access/sysattr.h"
#include "catalog/indexing.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_cast.h"
#include "catalog/pg_foreign_data_wrapper.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.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 "nodes/bitmapset.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "nodes/pg_list.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#include "optimizer/planmain.h"
#include "optimizer/restrictinfo.h"
#if PG_VERSION_NUM < 120000
#include "optimizer/var.h"
#else
#include "access/table.h"
#include "optimizer/appendinfo.h"
#include "optimizer/optimizer.h"
#endif
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "utils/builtins.h"
#include "utils/elog.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/syscache.h"
/*
* Postgres version dependent functions
*/
#if PG_VERSION_NUM < 120000
#define RFDW_VERDEP_ExecStoreTuple(t,s,b) ExecStoreTuple(t,s,InvalidBuffer,b)
#define TABLE_OPEN(t,l) heap_open(t,l)
#define TABLE_CLOSE(t,l) heap_close(t,l)
#else
#define RFDW_VERDEP_ExecStoreTuple(t,s,b) ExecStoreHeapTuple(t,s,b)
#define TABLE_OPEN(t,l) table_open(t,l)
#define TABLE_CLOSE(t,l) table_close(t,l)
#endif
#ifndef ALLOCSET_DEFAULT_SIZES
#define ALLOCSET_DEFAULT_SIZES \
ALLOCSET_DEFAULT_MINSIZE, ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE
#endif
#if PG_VERSION_NUM < 130000
#define PG_LIST_NEXT(l,lc) lnext(lc)
#else
#define PG_LIST_NEXT(l,lc) lnext(l,lc)
#endif
PG_MODULE_MAGIC;
#ifdef DO_DEBUG
#define DEBUG(x) elog x
#else
#define DEBUG(x)
#endif
#define DEBUG_LEVEL INFO
/* Possible crashes if you call elog at the end of the macro.
* Often you want to print reply fields with ERR_CLEANUP,
* but reply was set to NULL early in this macro :-(
* For example:
* ERR_CLEANUP(rctx->r_reply, rctx->r_ctx,
* (ERROR, "redis error: %s", rctx->r_reply->str));
*/
#define ERR_CLEANUP(reply,conn,eparams) do { \
elog eparams; \
if ((reply) != NULL) freeReplyObject(reply); \
if ((conn) != NULL) redisFree(conn); \
reply = NULL; \
conn = NULL; \
} while (0)
Datum redis_fdw_handler(PG_FUNCTION_ARGS);
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,
#if PG_VERSION_NUM < 90500
List *scan_clauses
#else
List *scan_clauses,
Plan *outer_plan
#endif
);
static void redisBeginForeignScan(ForeignScanState *node,
int eflags);
static TupleTableSlot *redisIterateForeignScan(ForeignScanState *node);
static void redisReScanForeignScan(ForeignScanState *node);
static void redisEndForeignScan(ForeignScanState *node);
#ifdef WRITE_API
static void redisAddForeignUpdateTargets(PlannerInfo *root,
Index rtindex,
RangeTblEntry *target_rte,
Relation target_relation);
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 TupleTableSlot *redisExecForeignUpdate(EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static TupleTableSlot *redisExecForeignDelete(EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static void redisEndForeignModify(EState *estate,
ResultRelInfo *rinfo);
static void redisExplainForeignModify(ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
struct ExplainState *es);
static int redisIsForeignRelUpdatable(Relation rel);
#endif /* WRITE_API */
static void redisExplainForeignScan(ForeignScanState *node,
struct ExplainState *es);
/*
* Structures used internally by this FDW.
*/
struct redis_fdw_option {
const char *optname;
Oid optctx;
};
#define OPT_HOST "host"
#define OPT_PORT "port"
#define OPT_TIMEOUT "timeout"
#define OPT_PASSWORD "password"
#define OPT_DATABASE "database"
#define OPT_KEY "key"
#define OPT_CHANNEL "channel"
#define OPT_KEYPREFIX "keyprefix"
#define OPT_TABLETYPE "tabletype"
#define OPT_REDIS "redis"
#define OPT_READONLY "readonly"
static struct redis_fdw_option valid_options[] =
{
/* Connection options */
{OPT_HOST, ForeignServerRelationId},
{OPT_PORT, ForeignServerRelationId},
{OPT_TIMEOUT, ForeignServerRelationId},
{OPT_PASSWORD, UserMappingRelationId},
{OPT_DATABASE, ForeignTableRelationId},
/* Table options */
{OPT_KEY, ForeignTableRelationId},
{OPT_CHANNEL, ForeignTableRelationId},
{OPT_KEYPREFIX, ForeignTableRelationId},
{OPT_TABLETYPE, ForeignTableRelationId},
{OPT_READONLY, ForeignTableRelationId},
/* Columns */
{OPT_REDIS, AttributeRelationId},
/* Sentinel */
{NULL, InvalidOid}
};
/*
* The supported data types (and hence table types).
*/
enum redis_data_type {
PG_REDIS_STRING, /* SET, GET */
PG_REDIS_HSET, /* HSET, HGET */
PG_REDIS_HMSET, /* HMSET, HMGET */
PG_REDIS_LIST, /* LSET, LINDEX, LRANGE, RPUSH, LPOP */
PG_REDIS_SET, /* SADD, SMEMBERS, SREM */
PG_REDIS_ZSET, /* XADD, ZREVRANGE, ZREM */
PG_REDIS_LEN, /* STRLEN, LLEN, HLEN, SCARD, ZCARD, DBSIZE */
PG_REDIS_TTL, /* (select) TTL and (update) EXPIRE/PERSIST */
PG_REDIS_PUBLISH, /* PUBLISH */
PG_REDIS_KEYS, /* KEYS * */
PG_REDIS_INVALID,
};
/* bit masks for param_flags */
#define PARAM_KEY 0x0001
#define PARAM_FIELD 0x0002
#define PARAM_ARRAY_FIELD 0x0004
#define PARAM_MEMBER 0x0008
#define PARAM_MEMBERS 0x0010
#define PARAM_INDEX 0x0020
#define PARAM_SCORE 0x0040
#define PARAM_EXPIRY 0x0080
#define PARAM_VALUE 0x0100
#define PARAM_TABLE_TYPE 0x0200
#define PARAM_CHANNEL 0x0400
#define PARAM_MESSAGE 0x0800
#define PARAM_VALTTL 0x1000
/*
* Name we will use for the junk attribute that holds the redis key
* for update and delete operations.
*/
#define REDISMODKEYNAME "__redis_mod_key_name"
/*
* column names/ids that this module accepts
*/
enum var_field {
VAR_KEY,
VAR_FIELD,
VAR_ARRAY_FIELD,
VAR_S_VALUE,
VAR_SARRAY_VALUE,
VAR_I_VALUE,
VAR_MEMBER,
VAR_MEMBERS,
VAR_EXPIRY,
VAR_VALTTL,
VAR_INDEX,
VAR_SCORE,
VAR_SZ_CARD,
VAR_SCARD,
VAR_ZCARD,
VAR_LEN,
VAR_TABLE_TYPE,
VAR_CHANNEL,
VAR_MESSAGE,
};
static const char *FIELD_NAMES[] = {
[VAR_KEY] = "key",
[VAR_FIELD] = "field",
[VAR_ARRAY_FIELD] = "field",
[VAR_S_VALUE] = "value",
[VAR_SARRAY_VALUE] = "value",
[VAR_I_VALUE] = "value",
[VAR_MEMBER] = "member",
[VAR_MEMBERS] = "members",
[VAR_EXPIRY] = "expiry",
[VAR_VALTTL] = "valttl",
[VAR_INDEX] = "index",
[VAR_SCORE] = "score",
[VAR_SZ_CARD] = "szcard",
[VAR_SCARD] = "scard",
[VAR_ZCARD] = "zcard",
[VAR_LEN] = "len",
[VAR_TABLE_TYPE] = "tabletype",
/* publish */
[VAR_CHANNEL] = "channel",
[VAR_MESSAGE] = "message"
};
/* supported column types */
enum {
R_INT,
R_TEXT,
R_FLOAT,
R_MTEXT,
R_MINT
};
enum redis_op {
ROP_INVALID = -1,
ROP_NEQ, /* <> */
ROP_EQ, /* = */
ROP_LT, /* < */
ROP_LTE, /* <= */
ROP_GT, /* > */
ROP_GTE, /* >= */
ROP_ARRAYELEMS /* @> */
};
enum redis_cmd {
REDIS_NONE,
REDIS_GET,
REDIS_HGETALL,
REDIS_HGET,
REDIS_HMGET,
REDIS_LINDEX,
REDIS_LRANGE,
REDIS_SISMEMBER,
REDIS_SMEMBERS,
REDIS_ZRANK,
REDIS_ZRANGE,
REDIS_ZRANGEBYSCORE,
REDIS_TTL,
REDIS_KEYS,
REDIS_SCARD,
REDIS_ZCARD,
REDIS_HLEN,
REDIS_LLEN,
REDIS_STRLEN,
REDIS_LEN, /* any of the len types above */
REDIS_DBSIZE,
REDIS_EXPIRE,
REDIS_PERSIST,
REDIS_SET,
REDIS_HSET,
REDIS_RPUSH,
REDIS_SADD,
REDIS_ZADD,
REDIS_PUBLISH,
REDIS_PSNUMSUB, /* PUBSUB NUMSUB */
REDIS_DISCARD_RESULT, /* discard the result obtained from redis */
};
struct redis_column {
int var_field; /* if -1, then column is not in output */
int orig_var_field; /* a copy of var_field */
int pgattnum;
Oid pgtype;
Oid pgtypmod;
regproc typoutput; /* type output conversion function */
regproc typinput; /* type input conversion function */
};
/*
* column definition per table schema.
*/
struct redis_table {
int colcnt;
struct redis_column *columns;
/* indices into which column has the attribute */
int key; /* also PUBLISH.channel */
int field;
int array_field; /* [] text */
int s_value; /* string value / publish.message */
int sarray_value; /* [] text */
int i_value; /* int64 value */
int member;
int members; /* [] text */
int expiry;
int valttl;
int index;
int score;
int szcard; /* scard or zcard */
int len;
int table_type;
};
/* right hand side Param of an expression */
struct redis_param_desc {
void *param;
int paramid;
enum var_field var_field; /* field associated with param */
enum redis_op op; /* operation on param */
char *value; /* stashed value, if any */
struct redis_param_desc *next;
};
/* where clause predicate values */
struct where_conds {
char *field; /* hset/hmset field */
char *s_value; /* value or member */
int64_t i_value; /* value or member */
int64_t min; /* list index, zset index, zset score */
int64_t max;
int min_op;
int max_op;
char *table_type; /* for len table only */
};
/*
* FDW state information for RelOptInfo.fdw_private and
* ForeignScanState.fdw_state.
*/
struct redis_fdw_ctx {
redisContext *r_ctx;
redisReply *r_reply;
char *host;
int port;
char *password;
int database;
enum redis_data_type table_type;
char *key; /* can be set in table opt or a column */
char *keyprefix; /* keys are prefixed with this */
char *pfxkey; /* keyprefix+key cached */
struct where_conds where_conds;
int64_t expiry; /* expiry parameter */
int64_t valttl;
unsigned long rowcount; /* rows returned by redis */
unsigned long rowsdone; /* rows already read from redis */
enum redis_cmd cmd;
CmdType psql_cmd; /* postgres' plan command */
struct redis_table rtable; /* definition of the pgsql table */
bool *pushdown_conds; /* conditions that can be pushed to redis */
struct redis_param_desc *params; /* list of parameters needed for query */
int param_flags; /* fields provided as params */
int where_flags; /* fields provided in WHERE */
/* Cached information */
ForeignTable *table;
ForeignServer *server;
PlannerInfo *root;
MemoryContext temp_ctx; /* short-lived memory for data mods */
/* for resjunks */
AttrNumber key_attno;
AttrNumber field_attno;
AttrNumber index_attno;
AttrNumber member_attno;
AttrNumber value_attno;
AttInMetadata *attmeta; /* for returning slot tuples */
char **slot_values;
};
#ifdef DO_DEBUG
static char *
reply_type_str(int n)
{
switch (n) {
case REDIS_REPLY_STRING:
return "STRING";
case REDIS_REPLY_ARRAY:
return "ARRAY";
case REDIS_REPLY_INTEGER:
return "INT";
case REDIS_REPLY_NIL:
return "NIL";
case REDIS_REPLY_STATUS:
return "STATUS";
case REDIS_REPLY_ERROR:
return "ERROR";
}
return "UNKNOWN";
}
static void
dump_reply(redisReply *r, int level)
{
char prefix[64];
int i;
redisReply *elem;
if (r == NULL)
return;
for (i = 0; i < level && i < 63; i++) {
prefix[i] = ' ';
}
prefix[i] = '\0';
DEBUG((DEBUG_LEVEL,
" Reply: %s%s len(%u) str(%s) int(%lld) elements(%lu)",
prefix, reply_type_str(r->type), (unsigned)r->len,
r->str ? r->str : "", r->integer, r->elements));
if (r->elements > 0) {
for (i = 0; i < r->elements; i++) {
elem = r->element[i];
dump_reply(elem, level+1);
}
}
}
#else
#define dump_reply(...)
#endif /* DO_DEBUG */
/*
* 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
redis_is_valid_opt(const char *option, Oid context)
{
struct redis_fdw_option *opt;
for (opt = valid_options; opt->optname != NULL; opt++) {
if (context == opt->optctx && strcmp(opt->optname, option) == 0)
return true;
}
return false;
}
/*
* Converts a postgresql array into a redis command to be used with
* hiredis.redisCommandArgv.
* argc is the number of items already in argv.
* max is the length of argv.
* Returns total "argc" if ok, else -1
*/
static int
psqlarray_to_rediscmd(char *src, int argc, int max,
char **argv, size_t *argvlen)
{
int curlen;
char *start;
char *sp;
if (*src == 0)
return -1;
curlen = 0;
if (*src == '{')
src++;
start = src;
while (argc < max) {
switch (*src) {
case '}':
case '\0':
if (curlen > 0) {
argv[argc] = start;
argvlen[argc] = curlen;
argc++;
curlen = 0;
*src = '\0';
}
goto done;
case '"':
/* read until end of quote */
src++;
sp = start = src;
while (*src != 0 && *src != '"') {
if (*src == '\\')
/* escape; transfer next character to here */
src++;
*sp = *src;
if (*src == '\0')
break;
src++;
sp++;
curlen++;
}
*sp = '\0';
argv[argc] = start;
argvlen[argc] = curlen;
argc++;
src++;
curlen = 0;
break;
case ',':
/* completed previous one */
*src = '\0';
argv[argc] = start;
argvlen[argc] = curlen;
argc++;
curlen = 0;
src++;
start = src;
break;
default:
curlen++;
src++;
break;
}
}
done:
return argc;
}
static int
redisarray_to_psqlarray(redisReply *reply, char **fields, char **values)
{
StringInfo res_f = NULL;
StringInfo res_v;
char *buf;
char *s;
int i, n;
int nescapes;
if (fields != NULL) {
res_f = makeStringInfo();
appendStringInfoChar(res_f,'{');
}
res_v = makeStringInfo();
appendStringInfoChar(res_v,'{');
for (i = 0; i < reply->elements; i++) {
redisReply *elem = reply->element[i];
if (fields != NULL) {
/* field and then val */
if (i > 0 && (i & 0x01) == 0)
appendStringInfoChar(res_f,',');
else if (i > 2 && (i & 0x01) == 1)
appendStringInfoChar(res_v,',');
} else if (i > 0) {
appendStringInfoChar(res_v,',');
}
if (elem->type == REDIS_REPLY_ARRAY) {
DEBUG((DEBUG_LEVEL, "nested array from redis not supported"));
return -1;
}
switch (elem->type) {
case REDIS_REPLY_STATUS:
case REDIS_REPLY_STRING:
/* escape quotes */
nescapes = 0;
for (n = 0; n < elem->len; n++) {
if (elem->str[n] == '"' || elem->str[n] == '\\')
nescapes++;
}
s = palloc(elem->len + nescapes + 4);
buf = s;
*buf++ = '"';
for (n = 0; n < elem->len; n++) {
if (elem->str[n] == '"' || elem->str[n] == '\\')
*buf++ = '\\';
*buf++ = elem->str[n];
}
*buf++ = '"';
*buf = '\0';
if (fields != NULL && (i & 0x01) == 0)
appendStringInfoString(res_f, s);
else
appendStringInfoString(res_v, s);
pfree(s);
break;
case REDIS_REPLY_INTEGER:
if (fields != NULL && (i & 0x01) == 0)
appendStringInfo(res_f, "%lld", elem->integer);
else
appendStringInfo(res_v, "%lld", elem->integer);
break;
case REDIS_REPLY_NIL:
if (fields != NULL && (i & 0x01) == 0)
appendStringInfo(res_f, "NULL");
else
appendStringInfo(res_v, "NULL");
break;
default:
break;
}
}
if (fields != NULL) {
appendStringInfoChar(res_f,'}');
*fields = res_f->data;
}
appendStringInfoChar(res_v,'}');
*values = res_v->data;
return 0;
}
static redisReply *
redis_do_hmget(redisContext *ctx, char *key, char *fields)
{
int argc;
char **argv;
size_t *argvlen;
argv = (char **)palloc(sizeof(char *) * 32);
argvlen = (size_t *)palloc(sizeof(size_t) * 32);
argv[0] = "HMGET";
argvlen[0] = 5;
argv[1] = key;
argvlen[1] = strlen(argv[1]);
argc = psqlarray_to_rediscmd(fields, 2, 32, argv, argvlen);
if (argc < 0) {
DEBUG((DEBUG_LEVEL, "parsing of psql array failed for HMGET"));
return NULL;
}
return (redisReply *)redisCommandArgv(ctx, argc, (const char **)argv, argvlen);
}
static Const *
redis_serialize_rtable(struct redis_fdw_ctx *rctx)
{
bytea *result;
Datum conval;
result = (bytea *)palloc(VARHDRSZ + sizeof(struct redis_table));
SET_VARSIZE(result, sizeof(struct redis_table));
memcpy(VARDATA(result), &(rctx->rtable), sizeof(struct redis_table));
conval = PointerGetDatum(result);
return makeConst(BYTEAOID, -1, InvalidOid, -1, conval, false, false);
}
static Const *
redis_serialize_rtable_cols(struct redis_fdw_ctx *rctx)
{
bytea *result;
Datum conval;
size_t len;
len = rctx->rtable.colcnt * sizeof(struct redis_column);
result = (bytea *)palloc(VARHDRSZ + len);
SET_VARSIZE(result, len);
memcpy(VARDATA(result), rctx->rtable.columns, len);
conval = PointerGetDatum(result);
return makeConst(BYTEAOID, -1, InvalidOid, -1, conval, false, false);
}
static void
redis_deserialize_rtable(struct redis_fdw_ctx *rctx, Const *conval)
{
bytea *val;
Assert((conval != NULL && conval->consttype == BYTEAOID));
val = DatumGetByteaP(conval->constvalue);
memcpy(&rctx->rtable, VARDATA(val), sizeof(struct redis_table));
DEBUG((DEBUG1, "unmarshaled rtable, varsize %d:\n"
"\tcolcnt: %d\n"
"\tkey: %d\n"
"\tfield: %d\n"
"\taray_field: %d\n"
"\ts_value: %d\n"
"\tsarray_value: %d\n"
"\ti_value: %d\n"
"\tmember: %d\n"
"\tmembers: %d\n"
"\texpiry: %d\n"
"\tindex: %d\n"
"\tscore: %d\n"
"\tszcard: %d\n"
"\tlen: %d\n"
"\ttable_type: %d",
VARSIZE(val),
rctx->rtable.colcnt,
rctx->rtable.key,
rctx->rtable.field,
rctx->rtable.array_field,
rctx->rtable.s_value,
rctx->rtable.sarray_value,
rctx->rtable.i_value,
rctx->rtable.member,
rctx->rtable.members,
rctx->rtable.expiry,
rctx->rtable.index,
rctx->rtable.score,
rctx->rtable.szcard,
rctx->rtable.len,
rctx->rtable.len
));
}
static void
redis_deserialize_rtable_cols(struct redis_fdw_ctx *rctx, Const *conval)
{
bytea *val;
int i;
Assert((conval != NULL && conval->consttype == BYTEAOID));
val = DatumGetByteaP(conval->constvalue);
DEBUG((DEBUG1, "unmarshaled rtable columns %s\n, varsize %d",
nodeToString(conval), VARSIZE(val)));
rctx->rtable.columns = (struct redis_column *)palloc(VARSIZE(val));
memcpy(rctx->rtable.columns, VARDATA(val), VARSIZE(val));
for (i = 0; i < rctx->rtable.colcnt; i++) {
DEBUG((DEBUG_LEVEL, " col var_field(%d:%s) -> pgtype(%d)",
rctx->rtable.columns[i].var_field,
FIELD_NAMES[rctx->rtable.columns[i].var_field],
rctx->rtable.columns[i].pgtype));
}
}
static Const *
serializeString(const char *s)
{
if (s == NULL)
return makeNullConst(TEXTOID, -1, InvalidOid);
else
return makeConst(TEXTOID, -1, InvalidOid, -1,
PointerGetDatum(cstring_to_text(s)), false, false);
}
#define serializeInt32(n) \
makeConst(INT4OID, -1, InvalidOid, sizeof(int32), \
Int32GetDatum((int32)n), false, true)
#define serializeInt64(n) \
makeConst(INT4OID, -1, InvalidOid, sizeof(int64), \
Int64GetDatum((int64)n), false, true)
static List *
redis_serialize_fdw(struct redis_fdw_ctx *rctx)
{
List *result = NIL;
int len = 0;
struct redis_param_desc *param;
struct where_conds *wc;
result = lappend(result, redis_serialize_rtable(rctx));
result = lappend(result, redis_serialize_rtable_cols(rctx));
result = lappend(result, serializeString(rctx->host));
result = lappend(result, serializeInt32(rctx->port));
result = lappend(result, serializeString(rctx->password));
result = lappend(result, serializeInt32(rctx->database));
result = lappend(result, serializeInt32(rctx->table_type));
result = lappend(result, serializeString(rctx->key));
result = lappend(result, serializeString(rctx->keyprefix));
wc = &rctx->where_conds;
result = lappend(result, serializeString(wc->field));
result = lappend(result, serializeString(wc->s_value));
result = lappend(result, serializeString(wc->table_type));
result = lappend(result, serializeInt64(wc->i_value));
result = lappend(result, serializeInt64(wc->min));
result = lappend(result, serializeInt64(wc->max));
result = lappend(result, serializeInt32(wc->min_op));
result = lappend(result, serializeInt32(wc->max_op));
result = lappend(result, serializeInt32(rctx->psql_cmd));
result = lappend(result, serializeInt32(rctx->param_flags));
result = lappend(result, serializeInt32(rctx->where_flags));
/* iterate through each param and marshal accordingly */
for (param = rctx->params; param != NULL; param = param->next)
len++;
result = lappend(result, serializeInt32(len));
for (param = rctx->params; param != NULL; param = param->next) {
/* keep paramid which is the location of the parameter */
Assert(param->param != NULL);
result = lappend(result, serializeInt32(param->paramid));
result = lappend(result, serializeInt32(param->var_field));
result = lappend(result, serializeInt32(param->op));
}
return result;
}
static char *
deserializeString(Const *constant)
{
if (constant->constisnull)
return NULL;
else
return text_to_cstring(DatumGetTextP(constant->constvalue));
}
static int64
deserializeInt(Const *constant)
{
if (constant->constlen <= 4)
return (int64)DatumGetInt32(constant->constvalue);
else
return (int64)DatumGetInt64(constant->constvalue);
}
static struct redis_fdw_ctx *
redis_deserialize_fdw(List *list)
{
struct redis_fdw_ctx *rctx;
ListCell *cell = list_head(list);
int len;
struct redis_param_desc *param, **pptr;
struct where_conds *wc;
DEBUG((DEBUG_LEVEL, "___ %s", __FUNCTION__));
rctx = (struct redis_fdw_ctx *)palloc0(sizeof(struct redis_fdw_ctx));
redis_deserialize_rtable(rctx, lfirst(cell));
cell = PG_LIST_NEXT(list, cell);
redis_deserialize_rtable_cols(rctx, lfirst(cell));
cell = PG_LIST_NEXT(list, cell);