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type.c
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type.c
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/*
* PL/Proxy - easy access to partitioned database.
*
* Copyright (c) 2006 Sven Suursoho, Skype Technologies OÜ
* Copyright (c) 2007 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Caches I/O info about scalar values.
*/
#include "plproxy.h"
/*
* Checks if we can safely use binary.
*/
static bool usable_binary(Oid oid)
{
switch (oid)
{
case BOOLOID:
case INT2OID:
case INT4OID:
case INT8OID:
case TEXTOID:
case BPCHAROID:
case VARCHAROID:
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
case BYTEAOID:
return true;
/* integer vs. float issue */
case TIMESTAMPOID:
case TIMESTAMPTZOID:
case DATEOID:
case TIMEOID:
/* interval binary fmt changed in 8.1 */
case INTERVALOID:
default:
return false;
}
}
/*
* Collects info about fields of a composite type.
*
* Based on TupleDescGetAttInMetadata.
*/
ProxyComposite *
plproxy_composite_info(ProxyFunction *func, TupleDesc tupdesc)
{
int i,
natts = tupdesc->natts;
ProxyComposite *ret;
MemoryContext old_ctx;
Form_pg_attribute a;
ProxyType *type;
const char *name;
old_ctx = MemoryContextSwitchTo(func->ctx);
ret = palloc(sizeof(*ret));
ret->type_list = palloc(sizeof(ProxyType *) * natts);
ret->name_list = palloc0(sizeof(char *) * natts);
ret->tupdesc = BlessTupleDesc(tupdesc);
ret->use_binary = 1;
MemoryContextSwitchTo(old_ctx);
for (i = 0; i < natts; i++)
{
a = tupdesc->attrs[i];
if (a->attisdropped)
plproxy_error(func, "dropped attrs not supported");
name = quote_identifier(NameStr(a->attname));
ret->name_list[i] = plproxy_func_strdup(func, name);
type = plproxy_find_type_info(func, a->atttypid, 0);
ret->type_list[i] = type;
if (!type->has_recv)
ret->use_binary = 0;
}
return ret;
}
/*
* Build result tuplw from binary or CString values.
*
* Based on BuildTupleFromCStrings.
*/
HeapTuple
plproxy_recv_composite(ProxyComposite *meta, char **values, int *lengths, int *fmts)
{
TupleDesc tupdesc = meta->tupdesc;
int natts = tupdesc->natts;
Datum *dvalues;
char *nulls;
int i;
HeapTuple tuple;
dvalues = (Datum *) palloc(natts * sizeof(Datum));
nulls = (char *) palloc(natts * sizeof(char));
/* Call the recv function for each attribute */
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
elog(ERROR, "dropped attrs not supported");
dvalues[i] = plproxy_recv_type(meta->type_list[i],
values[i], lengths[i], fmts[i]);
nulls[i] = (values[i] != NULL) ? ' ' : 'n';
}
/* Form a tuple */
tuple = heap_formtuple(tupdesc, dvalues, nulls);
/*
* Release locally palloc'd space.
*/
for (i = 0; i < natts; i++)
{
if (nulls[i] == 'n')
continue;
if (meta->type_list[i]->by_value)
continue;
pfree(DatumGetPointer(dvalues[i]));
}
pfree(dvalues);
pfree(nulls);
return tuple;
}
/* Find info about scalar type */
ProxyType *
plproxy_find_type_info(ProxyFunction *func, Oid oid, bool for_send)
{
ProxyType *type;
HeapTuple t_type,
t_nsp;
Form_pg_type s_type;
Form_pg_namespace s_nsp;
char namebuf[NAMEDATALEN * 4 + 2 + 1 + 2 + 1];
Oid nsoid;
/* fetch pg_type row */
t_type = SearchSysCache(TYPEOID, ObjectIdGetDatum(oid), 0, 0, 0);
if (!HeapTupleIsValid(t_type))
plproxy_error(func, "cache lookup failed for type %u", oid);
/* typname, typnamespace, PG_CATALOG_NAMESPACE, PG_PUBLIC_NAMESPACE */
s_type = (Form_pg_type) GETSTRUCT(t_type);
nsoid = s_type->typnamespace;
if (nsoid != PG_CATALOG_NAMESPACE)
{
t_nsp = SearchSysCache(NAMESPACEOID, ObjectIdGetDatum(nsoid), 0, 0, 0);
if (!HeapTupleIsValid(t_nsp))
plproxy_error(func, "cache lookup failed for namespace %u", nsoid);
s_nsp = (Form_pg_namespace) GETSTRUCT(t_nsp);
snprintf(namebuf, sizeof(namebuf), "%s.%s",
quote_identifier(NameStr(s_nsp->nspname)),
quote_identifier(NameStr(s_type->typname)));
ReleaseSysCache(t_nsp);
}
else
{
snprintf(namebuf, sizeof(namebuf), "%s", quote_identifier(NameStr(s_type->typname)));
}
/* sanity check */
switch (s_type->typtype)
{
default:
case 'p':
if (oid != VOIDOID)
plproxy_error(func, "unsupported pseudo type: %s (%u)",
namebuf, oid);
case 'b':
case 'c':
case 'd':
break;
}
/* allocate & fill structure */
type = plproxy_func_alloc(func, sizeof(*type));
memset(type, 0, sizeof(*type));
type->type_oid = oid;
type->io_param = getTypeIOParam(t_type);
type->for_send = for_send;
type->by_value = s_type->typbyval;
type->name = plproxy_func_strdup(func, namebuf);
/* decide what function is needed */
if (for_send)
{
fmgr_info_cxt(s_type->typoutput, &type->io.out.output_func, func->ctx);
if (OidIsValid(s_type->typsend) && usable_binary(oid))
{
fmgr_info_cxt(s_type->typsend, &type->io.out.send_func, func->ctx);
type->has_send = 1;
}
}
else
{
fmgr_info_cxt(s_type->typinput, &type->io.in.input_func, func->ctx);
if (OidIsValid(s_type->typreceive) && usable_binary(oid))
{
fmgr_info_cxt(s_type->typreceive, &type->io.in.recv_func, func->ctx);
type->has_recv = 1;
}
}
ReleaseSysCache(t_type);
return type;
}
/* Convert a Datum to parameter for libpq */
char *
plproxy_send_type(ProxyType *type, Datum val, bool allow_bin, int *len, int *fmt)
{
bytea *bin;
char *res;
Assert(type->for_send == 1);
if (allow_bin && type->has_send)
{
bin = SendFunctionCall(&type->io.out.send_func, val);
res = VARDATA(bin);
*len = VARSIZE(bin) - VARHDRSZ;
*fmt = 1;
}
else
{
res = OutputFunctionCall(&type->io.out.output_func, val);
*len = 0;
*fmt = 0;
}
return res;
}
/*
* Point StringInfo to fixed buffer.
*
* Supposedly StringInfo wants 0 at the end.
* Luckily libpq already provides it so all is fine.
*
* Although it should not matter to binary I/O functions.
*/
static void
setFixedStringInfo(StringInfo str, void *data, int len)
{
str->data = data;
str->maxlen = len;
str->len = len;
str->cursor = 0;
}
/* Convert a libpq result to Datum */
Datum
plproxy_recv_type(ProxyType *type, char *val, int len, bool bin)
{
Datum res;
StringInfoData buf;
Assert(type->for_send == 0);
if (bin)
{
if (!type->has_recv)
elog(ERROR, "PL/Proxy: type %u recv not supported", type->type_oid);
/* avoid unnecessary copy */
setFixedStringInfo(&buf, val, len);
res = ReceiveFunctionCall(&type->io.in.recv_func,
&buf, type->io_param, -1);
}
else
{
res = InputFunctionCall(&type->io.in.input_func,
val, type->io_param, -1);
}
return res;
}