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plv8_func.cc
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/*-------------------------------------------------------------------------
*
* plv8_func.cc : PL/v8 built-in functions.
*
* Copyright (c) 2009-2012, the PLV8JS Development Group.
*-------------------------------------------------------------------------
*/
#include "plv8.h"
#include "plv8_param.h"
#include <string>
extern "C" {
#define delete delete_
#define namespace namespace_
#define typeid typeid_
#define typename typename_
#define using using_
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "executor/spi.h"
#include "parser/parse_type.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#undef delete
#undef namespace
#undef typeid
#undef typename
#undef using
} // extern "C"
using namespace v8;
static void plv8_FunctionInvoker(const FunctionCallbackInfo<v8::Value>& args) throw();
static void plv8_Elog(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_Execute(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_Prepare(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_PlanCursor(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_PlanExecute(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_PlanFree(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_CursorFetch(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_CursorMove(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_CursorClose(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_ReturnNext(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_Subtransaction(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_FindFunction(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_GetWindowObject(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetPartitionLocal(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinSetPartitionLocal(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetCurrentPosition(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetPartitionRowCount(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinSetMarkPosition(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinRowsArePeers(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetFuncArgInPartition(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetFuncArgInFrame(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_WinGetFuncArgCurrent(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_QuoteLiteral(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_QuoteNullable(const FunctionCallbackInfo<v8::Value>& args);
static void plv8_QuoteIdent(const FunctionCallbackInfo<v8::Value>& args);
/*
* Window function API allows to store partition-local memory, but
* the allocation is only once per partition. maxlen represents
* the allocated size for this partition (if it's zero, the allocation
* has just happened). Also v8 doesn't provide vaule serialization,
* so currently the object is JSON-ized and stored as a string.
*/
typedef struct window_storage
{
size_t maxlen; /* allocated memory */
size_t len; /* the byte size of data */
char data[1]; /* actual string (without null-termination */
} window_storage;
#if PG_VERSION_NUM < 90100
/*
* quote_literal_cstr -
* returns a properly quoted literal
*/
static char *
quote_literal_cstr(const char *rawstr)
{
return TextDatumGetCString(
DirectFunctionCall1(quote_literal, CStringGetTextDatum(rawstr)));
}
#endif
static inline Local<v8::Value>
WrapCallback(FunctionCallback func)
{
return External::New(plv8_isolate,
reinterpret_cast<void *>(
reinterpret_cast<uintptr_t>(func)));
}
static inline FunctionCallback
UnwrapCallback(Handle<v8::Value> value)
{
return reinterpret_cast<FunctionCallback>(
reinterpret_cast<uintptr_t>(External::Cast(*value)->Value()));
}
static inline void
SetCallback(Handle<ObjectTemplate> obj, const char *name,
FunctionCallback func, PropertyAttribute attr = None)
{
obj->Set(String::NewFromUtf8(plv8_isolate, name, String::kInternalizedString),
FunctionTemplate::New(plv8_isolate, plv8_FunctionInvoker,
WrapCallback(func)), attr);
}
class SubTranBlock
{
public:
SubTranBlock();
void enter();
void exit(bool success);
};
Persistent<ObjectTemplate> PlanTemplate;
Persistent<ObjectTemplate> CursorTemplate;
Persistent<ObjectTemplate> WindowObjectTemplate;
static Handle<v8::Value>
SPIResultToValue(int status)
{
Local<v8::Value> result;
if (status < 0) {
plv8_isolate->ThrowException(String::NewFromUtf8(plv8_isolate, FormatSPIStatus(status)));
return result;
}
switch (status)
{
case SPI_OK_SELECT:
case SPI_OK_INSERT_RETURNING:
case SPI_OK_DELETE_RETURNING:
case SPI_OK_UPDATE_RETURNING:
{
int nrows = SPI_processed;
Converter conv(SPI_tuptable->tupdesc);
Local<Array> rows = Array::New(plv8_isolate, nrows);
for (int r = 0; r < nrows; r++)
rows->Set(r, conv.ToValue(SPI_tuptable->vals[r]));
result = rows;
break;
}
default:
result = Int32::New(plv8_isolate, SPI_processed);
break;
}
return result;
}
SubTranBlock::SubTranBlock()
{}
void
SubTranBlock::enter()
{
if (!IsTransactionOrTransactionBlock())
throw js_error("out of transaction");
BeginInternalSubTransaction(NULL);
}
void
SubTranBlock::exit(bool success)
{
if (success)
ReleaseCurrentSubTransaction();
else
RollbackAndReleaseCurrentSubTransaction();
}
JSONObject::JSONObject()
{
Handle<Context> context = plv8_isolate->GetCurrentContext();
Handle<Object> global = context->Global();
m_json = global->Get(String::NewFromUtf8(plv8_isolate, "JSON", String::kInternalizedString))->ToObject();
if (m_json.IsEmpty())
throw js_error("JSON not found");
}
/*
* Call JSON.parse(). Currently this supports only one argument.
*/
Handle<v8::Value>
JSONObject::Parse(Handle<v8::Value> str)
{
Handle<Function> parse_func =
Handle<Function>::Cast(m_json->Get(String::NewFromUtf8(plv8_isolate, "parse", String::kInternalizedString)));
if (parse_func.IsEmpty())
throw js_error("JSON.parse() not found");
return parse_func->Call(m_json, 1, &str);
}
/*
* Call JSON.stringify(). Currently this supports only one argument.
*/
Handle<v8::Value>
JSONObject::Stringify(Handle<v8::Value> val)
{
Handle<Function> stringify_func =
Handle<Function>::Cast(m_json->Get(String::NewFromUtf8(plv8_isolate, "stringify", String::kInternalizedString)));
if (stringify_func.IsEmpty())
throw js_error("JSON.stringify() not found");
return stringify_func->Call(m_json, 1, &val);
}
void
SetupPlv8Functions(Handle<ObjectTemplate> plv8)
{
PropertyAttribute attrFull =
PropertyAttribute(ReadOnly | DontEnum | DontDelete);
SetCallback(plv8, "elog", plv8_Elog, attrFull);
SetCallback(plv8, "execute", plv8_Execute, attrFull);
SetCallback(plv8, "prepare", plv8_Prepare, attrFull);
SetCallback(plv8, "return_next", plv8_ReturnNext, attrFull);
SetCallback(plv8, "subtransaction", plv8_Subtransaction, attrFull);
SetCallback(plv8, "find_function", plv8_FindFunction, attrFull);
SetCallback(plv8, "get_window_object", plv8_GetWindowObject, attrFull);
SetCallback(plv8, "quote_literal", plv8_QuoteLiteral, attrFull);
SetCallback(plv8, "quote_nullable", plv8_QuoteNullable, attrFull);
SetCallback(plv8, "quote_ident", plv8_QuoteIdent, attrFull);
plv8->SetInternalFieldCount(PLV8_INTNL_MAX);
}
/*
* v8 is not exception-safe! We cannot throw C++ exceptions over v8 functions.
* So, we catch C++ exceptions and convert them to JavaScript ones.
*/
static void
plv8_FunctionInvoker(const FunctionCallbackInfo<v8::Value> &args) throw()
{
HandleScope handle_scope(plv8_isolate);
MemoryContext ctx = CurrentMemoryContext;
FunctionCallback fn = UnwrapCallback(args.Data());
try
{
return fn(args);
}
catch (js_error& e)
{
args.GetReturnValue().Set(plv8_isolate->ThrowException(e.error_object()));
}
catch (pg_error& e)
{
MemoryContextSwitchTo(ctx);
ErrorData *edata = CopyErrorData();
Handle<String> message = ToString(edata->message);
Handle<String> sqlerrcode = ToString(unpack_sql_state(edata->sqlerrcode));
#if PG_VERSION_NUM >= 90300
Handle<Primitive> schema_name = edata->schema_name ?
Handle<Primitive>(ToString(edata->schema_name)) : Null(plv8_isolate);
Handle<Primitive> table_name = edata->table_name ?
Handle<Primitive>(ToString(edata->table_name)) : Null(plv8_isolate);
Handle<Primitive> column_name = edata->column_name ?
Handle<Primitive>(ToString(edata->column_name)) : Null(plv8_isolate);
Handle<Primitive> datatype_name = edata->datatype_name ?
Handle<Primitive>(ToString(edata->datatype_name)) : Null(plv8_isolate);
Handle<Primitive> constraint_name = edata->constraint_name ?
Handle<Primitive>(ToString(edata->constraint_name)) : Null(plv8_isolate);
#endif
// XXX: add other fields? (detail, hint, context, internalquery...)
FlushErrorState();
FreeErrorData(edata);
Handle<v8::Object> err = Exception::Error(message)->ToObject();
err->Set(String::NewFromUtf8(plv8_isolate, "sqlerrcode"), sqlerrcode);
#if PG_VERSION_NUM >= 90300
err->Set(String::NewFromUtf8(plv8_isolate, "schema_name"), schema_name);
err->Set(String::NewFromUtf8(plv8_isolate, "table_name"), table_name);
err->Set(String::NewFromUtf8(plv8_isolate, "column_name"), column_name);
err->Set(String::NewFromUtf8(plv8_isolate, "datatype_name"), datatype_name);
err->Set(String::NewFromUtf8(plv8_isolate, "constraint_name"), constraint_name);
#endif
args.GetReturnValue().Set(plv8_isolate->ThrowException(err));
}
}
/*
* plv8.elog(elevel, str)
*/
static void
plv8_Elog(const FunctionCallbackInfo<v8::Value>& args)
{
MemoryContext ctx = CurrentMemoryContext;
if (args.Length() < 2) {
args.GetReturnValue().Set(plv8_isolate->ThrowException(String::NewFromUtf8(plv8_isolate, "usage: plv8.elog(elevel, ...)")));
return;
}
int elevel = args[0]->Int32Value();
switch (elevel)
{
case DEBUG5:
case DEBUG4:
case DEBUG3:
case DEBUG2:
case DEBUG1:
case LOG:
case INFO:
case NOTICE:
case WARNING:
case ERROR:
break;
default:
args.GetReturnValue().Set(plv8_isolate->ThrowException(String::NewFromUtf8(plv8_isolate, "invalid error level")));
return;
}
std::string msg;
std::string buf;
for (int i = 1; i < args.Length(); i++)
{
if (i > 1){
msg += " ";
}
if (!CString::toStdString(args[i],buf)){
args.GetReturnValue().Set(Undefined(plv8_isolate));
return;
}
msg += buf;
}
const char *message = msg.c_str();
if (elevel != ERROR)
{
elog(elevel, "%s", message);
args.GetReturnValue().Set(Undefined(plv8_isolate));
return;
}
/* ERROR case */
PG_TRY();
{
elog(elevel, "%s", message);
}
PG_CATCH();
{
MemoryContextSwitchTo(ctx);
ErrorData *edata = CopyErrorData();
Local<String> message = ToString(edata->message);
FlushErrorState();
FreeErrorData(edata);
args.GetReturnValue().Set(plv8_isolate->ThrowException(Exception::Error(message)));
return;
}
PG_END_TRY();
args.GetReturnValue().Set(Undefined(plv8_isolate));
}
static Datum
value_get_datum(Handle<v8::Value> value, Oid typid, char *isnull)
{
if (value->IsUndefined() || value->IsNull())
{
*isnull = 'n';
return (Datum) 0;
}
else
{
plv8_type typinfo = { 0 };
bool IsNull;
Datum datum;
plv8_fill_type(&typinfo, typid);
try
{
datum = ToDatum(value, &IsNull, &typinfo);
}
catch (js_error& e){ e.rethrow(); }
catch (pg_error& e){ e.rethrow(); }
*isnull = (IsNull ? 'n' : ' ');
return datum;
}
}
static int
plv8_execute_params(const char *sql, Handle<Array> params)
{
Assert(!params.IsEmpty());
int status;
int nparam = params->Length();
Datum *values = (Datum *) palloc(sizeof(Datum) * nparam);
char *nulls = (char *) palloc(sizeof(char) * nparam);
/*
* Since 9.0, SPI may have the parser deduce the parameter types. In prior
* versions, we infer the types from the input JS values.
*/
#if PG_VERSION_NUM >= 90000
SPIPlanPtr plan;
plv8_param_state parstate = {0};
ParamListInfo paramLI;
parstate.memcontext = CurrentMemoryContext;
plan = SPI_prepare_params(sql, plv8_variable_param_setup,
&parstate, 0);
if (parstate.numParams != nparam)
elog(ERROR, "parameter numbers mismatch: %d != %d",
parstate.numParams, nparam);
for (int i = 0; i < nparam; i++)
{
Handle<v8::Value> param = params->Get(i);
values[i] = value_get_datum(param,
parstate.paramTypes[i], &nulls[i]);
}
paramLI = plv8_setup_variable_paramlist(&parstate, values, nulls);
status = SPI_execute_plan_with_paramlist(plan, paramLI, false, 0);
#else
Oid *types = (Oid *) palloc(sizeof(Oid) * nparam);
for (int i = 0; i < nparam; i++)
{
Handle<v8::Value> param = params->Get(i);
types[i] = inferred_datum_type(param);
if (types[i] == InvalidOid)
elog(ERROR, "parameter[%d] cannot translate to a database type", i);
values[i] = value_get_datum(param, types[i], &nulls[i]);
}
status = SPI_execute_with_args(sql, nparam, types, values, nulls, false, 0);
pfree(types);
#endif
pfree(values);
pfree(nulls);
return status;
}
static Handle<Array>
convertArgsToArray(const FunctionCallbackInfo<v8::Value> &args, int start, int downshift)
{
Local<Array> result = Array::New(plv8_isolate, args.Length() - start);
for (int i = start; i < args.Length(); i++)
{
result->Set(i - downshift, args[i]);
}
return result;
}
/*
* plv8.execute(statement, [param, ...])
*/
static void
plv8_Execute(const FunctionCallbackInfo<v8::Value> &args)
{
int status;
if (args.Length() < 1) {
args.GetReturnValue().Set(Undefined(plv8_isolate));
return;
}
CString sql(args[0]);
Handle<Array> params;
if (args.Length() >= 2)
{
if (args[1]->IsArray())
params = Handle<Array>::Cast(args[1]);
else /* Consume trailing elements as an array. */
params = convertArgsToArray(args, 1, 1);
}
int nparam = params.IsEmpty() ? 0 : params->Length();
SubTranBlock subtran;
PG_TRY();
{
subtran.enter();
if (nparam == 0)
status = SPI_exec(sql, 0);
else
status = plv8_execute_params(sql, params);
}
PG_CATCH();
{
subtran.exit(false);
SPI_pop_conditional(true);
throw pg_error();
}
PG_END_TRY();
subtran.exit(true);
args.GetReturnValue().Set(SPIResultToValue(status));
}
/*
* plv8.prepare(statement, args...)
*/
static void
plv8_Prepare(const FunctionCallbackInfo<v8::Value> &args)
{
SPIPlanPtr initial = NULL, saved;
CString sql(args[0]);
Handle<Array> array;
int arraylen = 0;
Oid *types = NULL;
plv8_param_state *parstate = NULL;
if (args.Length() > 1)
{
if (args[1]->IsArray())
array = Handle<Array>::Cast(args[1]);
else /* Consume trailing elements as an array. */
array = convertArgsToArray(args, 1, 0);
arraylen = array->Length();
types = (Oid *) palloc(sizeof(Oid) * arraylen);
}
for (int i = 0; i < arraylen; i++)
{
CString typestr(array->Get(i));
int32 typemod;
#if PG_VERSION_NUM >= 90400
parseTypeString(typestr, &types[i], &typemod, false);
#else
parseTypeString(typestr, &types[i], &typemod);
#endif
}
PG_TRY();
{
#if PG_VERSION_NUM >= 90000
if (args.Length() == 1)
{
parstate =
(plv8_param_state *) palloc0(sizeof(plv8_param_state));
parstate->memcontext = CurrentMemoryContext;
initial = SPI_prepare_params(sql, plv8_variable_param_setup,
parstate, 0);
}
else
#endif
initial = SPI_prepare(sql, arraylen, types);
saved = SPI_saveplan(initial);
SPI_freeplan(initial);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
if (PlanTemplate.IsEmpty())
{
Local<FunctionTemplate> base = FunctionTemplate::New(plv8_isolate);
base->SetClassName(String::NewFromUtf8(plv8_isolate, "PreparedPlan", String::kInternalizedString));
Local<ObjectTemplate> templ = base->InstanceTemplate();
templ->SetInternalFieldCount(2);
SetCallback(templ, "cursor", plv8_PlanCursor);
SetCallback(templ, "execute", plv8_PlanExecute);
SetCallback(templ, "free", plv8_PlanFree);
PlanTemplate.Reset(plv8_isolate, templ);
}
Local<ObjectTemplate> templ = Local<ObjectTemplate>::New(plv8_isolate, PlanTemplate);
Local<v8::Object> result = templ->NewInstance();
result->SetInternalField(0, External::New(plv8_isolate, saved));
result->SetInternalField(1, External::New(plv8_isolate, parstate));
args.GetReturnValue().Set(result);
}
/*
* plan.cursor(args, ...)
*/
static void
plv8_PlanCursor(const FunctionCallbackInfo<v8::Value> &args)
{
Handle<v8::Object> self = args.This();
SPIPlanPtr plan;
Datum *values = NULL;
char *nulls = NULL;
int nparam = 0, argcount;
Handle<Array> params;
Portal cursor;
plv8_param_state *parstate = NULL;
plan = static_cast<SPIPlanPtr>(
Handle<External>::Cast(self->GetInternalField(0))->Value());
if (plan == NULL) {
StringInfoData buf;
initStringInfo(&buf);
appendStringInfo(&buf,
"plan unexpectedly null");
throw js_error(pstrdup(buf.data));
}
/* XXX: Add plan validation */
if (args.Length() > 0)
{
if (args[0]->IsArray())
params = Handle<Array>::Cast(args[0]);
else
params = convertArgsToArray(args, 0, 0);
nparam = params->Length();
}
/*
* If the plan has the variable param info, use it.
*/
parstate = static_cast<plv8_param_state *>(
Handle<External>::Cast(self->GetInternalField(1))->Value());
if (parstate)
argcount = parstate->numParams;
else
argcount = SPI_getargcount(plan);
if (argcount != nparam)
{
StringInfoData buf;
initStringInfo(&buf);
appendStringInfo(&buf,
"plan expected %d argument(s), given is %d", argcount, nparam);
throw js_error(pstrdup(buf.data));
}
if (nparam > 0)
{
values = (Datum *) palloc(sizeof(Datum) * nparam);
nulls = (char *) palloc(sizeof(char) * nparam);
}
for (int i = 0; i < nparam; i++)
{
Handle<v8::Value> param = params->Get(i);
Oid typid;
if (parstate)
typid = parstate->paramTypes[i];
else
typid = SPI_getargtypeid(plan, i);
values[i] = value_get_datum(param, typid, &nulls[i]);
}
PG_TRY();
{
#if PG_VERSION_NUM >= 90000
if (parstate)
{
ParamListInfo paramLI;
paramLI = plv8_setup_variable_paramlist(parstate, values, nulls);
cursor = SPI_cursor_open_with_paramlist(NULL, plan, paramLI, false);
}
else
#endif
cursor = SPI_cursor_open(NULL, plan, values, nulls, false);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
Handle<String> cname = ToString(cursor->name, strlen(cursor->name));
/*
* Instantiate if the template is empty.
*/
if (CursorTemplate.IsEmpty())
{
Local<FunctionTemplate> base = FunctionTemplate::New(plv8_isolate);
base->SetClassName(String::NewFromUtf8(plv8_isolate, "Cursor", String::kInternalizedString));
Local<ObjectTemplate> templ = base->InstanceTemplate();
templ->SetInternalFieldCount(1);
SetCallback(templ, "fetch", plv8_CursorFetch);
SetCallback(templ, "move", plv8_CursorMove);
SetCallback(templ, "close", plv8_CursorClose);
CursorTemplate.Reset(plv8_isolate, templ);
}
Local<ObjectTemplate> templ = Local<ObjectTemplate>::New(plv8_isolate, CursorTemplate);
Local<v8::Object> result = templ->NewInstance();
result->SetInternalField(0, cname);
args.GetReturnValue().Set(result);
}
/*
* plan.execute(args, ...)
*/
static void
plv8_PlanExecute(const FunctionCallbackInfo<v8::Value> &args)
{
Handle<v8::Object> self = args.This();
SPIPlanPtr plan;
Datum *values = NULL;
char *nulls = NULL;
int nparam = 0, argcount;
Handle<Array> params;
SubTranBlock subtran;
int status;
plv8_param_state *parstate = NULL;
plan = static_cast<SPIPlanPtr>(
Handle<External>::Cast(self->GetInternalField(0))->Value());
/* XXX: Add plan validation */
if (args.Length() > 0)
{
if (args[0]->IsArray())
params = Handle<Array>::Cast(args[0]);
else
params = convertArgsToArray(args, 0, 0);
nparam = params->Length();
}
/*
* If the plan has the variable param info, use it.
*/
parstate = static_cast<plv8_param_state *>(
Handle<External>::Cast(self->GetInternalField(1))->Value());
if (parstate)
argcount = parstate->numParams;
else
argcount = SPI_getargcount(plan);
if (argcount != nparam)
{
StringInfoData buf;
initStringInfo(&buf);
appendStringInfo(&buf,
"plan expected %d argument(s), given is %d", argcount, nparam);
throw js_error(pstrdup(buf.data));
}
if (nparam > 0)
{
values = (Datum *) palloc(sizeof(Datum) * nparam);
nulls = (char *) palloc(sizeof(char) * nparam);
}
for (int i = 0; i < nparam; i++)
{
Handle<v8::Value> param = params->Get(i);
Oid typid;
if (parstate)
typid = parstate->paramTypes[i];
else
typid = SPI_getargtypeid(plan, i);
values[i] = value_get_datum(param, typid, &nulls[i]);
}
PG_TRY();
{
subtran.enter();
#if PG_VERSION_NUM >= 90000
if (parstate)
{
ParamListInfo paramLI;
paramLI = plv8_setup_variable_paramlist(parstate, values, nulls);
status = SPI_execute_plan_with_paramlist(plan, paramLI, false, 0);
}
else
#endif
status = SPI_execute_plan(plan, values, nulls, false, 0);
}
PG_CATCH();
{
subtran.exit(false);
throw pg_error();
}
PG_END_TRY();
subtran.exit(true);
args.GetReturnValue().Set(SPIResultToValue(status));
}
/*
* plan.free()
*/
static void
plv8_PlanFree(const FunctionCallbackInfo<v8::Value> &args)
{
Handle<v8::Object> self = args.This();
SPIPlanPtr plan;
plv8_param_state *parstate;
int status = 0;
plan = static_cast<SPIPlanPtr>(
Handle<External>::Cast(self->GetInternalField(0))->Value());
if (plan)
status = SPI_freeplan(plan);
self->SetInternalField(0, External::New(plv8_isolate, 0));
parstate = static_cast<plv8_param_state *>(
Handle<External>::Cast(self->GetInternalField(1))->Value());
if (parstate)
pfree(parstate);
self->SetInternalField(1, External::New(plv8_isolate, 0));
args.GetReturnValue().Set(Int32::New(plv8_isolate, status));
}
/*
* cursor.fetch([n])
*/
static void
plv8_CursorFetch(const FunctionCallbackInfo<v8::Value> &args)
{
Handle<v8::Object> self = args.This();
CString cname(self->GetInternalField(0));
Portal cursor = SPI_cursor_find(cname);
int nfetch = 1;
bool forward = true, wantarray = false;
if (!cursor)
throw js_error("cannot find cursor");
if (args.Length() >= 1)
{
wantarray = true;
nfetch = args[0]->Int32Value();
if (nfetch < 0)
{
nfetch = -nfetch;
forward = false;
}
}
PG_TRY();
{
SPI_cursor_fetch(cursor, forward, nfetch);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
if (SPI_processed > 0)
{
Converter conv(SPI_tuptable->tupdesc);
if (!wantarray)
{
Handle<v8::Object> result = conv.ToValue(SPI_tuptable->vals[0]);
args.GetReturnValue().Set(result);
SPI_freetuptable(SPI_tuptable);
return;
}
else
{
Handle<Array> array = Array::New(plv8_isolate);
for (unsigned int i = 0; i < SPI_processed; i++)
array->Set(i, conv.ToValue(SPI_tuptable->vals[i]));
args.GetReturnValue().Set(array);
SPI_freetuptable(SPI_tuptable);
return;
}
}
SPI_freetuptable(SPI_tuptable);
args.GetReturnValue().Set(Undefined(plv8_isolate));
}
/*
* cursor.move(n)
*/
static void
plv8_CursorMove(const FunctionCallbackInfo<v8::Value>& args)
{
Handle<v8::Object> self = args.This();
CString cname(self->GetInternalField(0));
Portal cursor = SPI_cursor_find(cname);
int nmove = 1;
bool forward = true;
if (!cursor)
throw js_error("cannot find cursor");
if (args.Length() < 1) {
args.GetReturnValue().Set(Undefined(plv8_isolate));
return;
}
nmove = args[0]->Int32Value();
if (nmove < 0)
{
nmove = -nmove;
forward = false;
}
PG_TRY();
{
SPI_cursor_move(cursor, forward, nmove);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
args.GetReturnValue().Set(Undefined(plv8_isolate));
}
/*
* cursor.close()
*/
static void
plv8_CursorClose(const FunctionCallbackInfo<v8::Value> &args)
{
Handle<v8::Object> self = args.This();
CString cname(self->GetInternalField(0));
Portal cursor = SPI_cursor_find(cname);
if (!cursor)
throw js_error("cannot find cursor");
PG_TRY();
{
SPI_cursor_close(cursor);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
args.GetReturnValue().Set(Int32::New(plv8_isolate, cursor ? 1 : 0));
}
/*
* plv8.return_next(retval)
*/
static void
plv8_ReturnNext(const FunctionCallbackInfo<v8::Value>& args)
{
Handle<v8::Object> self = args.This();
Handle<v8::Value> conv_value = self->GetInternalField(PLV8_INTNL_CONV);
if (!conv_value->IsExternal())
throw js_error("return_next called in context that cannot accept a set");
Converter *conv = static_cast<Converter *>(
Handle<External>::Cast(conv_value)->Value());
Tuplestorestate *tupstore = static_cast<Tuplestorestate *>(
Handle<External>::Cast(
self->GetInternalField(PLV8_INTNL_TUPSTORE))->Value());
conv->ToDatum(args[0], tupstore);
args.GetReturnValue().Set(Undefined(plv8_isolate));
}
/*
* plv8.subtransaction(func(){ ... })
*/
static void
plv8_Subtransaction(const FunctionCallbackInfo<v8::Value>& args)
{
if (args.Length() < 1) {
args.GetReturnValue().Set(Undefined(plv8_isolate));