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plv8.cc
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/*-------------------------------------------------------------------------
*
* plv8.cc : PL/v8 handler routines.
*
* Copyright (c) 2009-2012, the PLV8JS Development Group.
*-------------------------------------------------------------------------
*/
#include "plv8.h"
#include "libplatform/libplatform.h"
#include <new>
extern "C" {
#define delete delete_
#define namespace namespace_
#define typeid typeid_
#define typename typename_
#define using using_
#if PG_VERSION_NUM >= 90300
#include "access/htup_details.h"
#endif
#include "access/xact.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#undef delete
#undef namespace
#undef typeid
#undef typename
#undef using
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(plv8_call_handler);
PG_FUNCTION_INFO_V1(plv8_call_validator);
PG_FUNCTION_INFO_V1(plcoffee_call_handler);
PG_FUNCTION_INFO_V1(plcoffee_call_validator);
PG_FUNCTION_INFO_V1(plls_call_handler);
PG_FUNCTION_INFO_V1(plls_call_validator);
Datum plv8_call_handler(PG_FUNCTION_ARGS);
Datum plv8_call_validator(PG_FUNCTION_ARGS);
Datum plcoffee_call_handler(PG_FUNCTION_ARGS);
Datum plcoffee_call_validator(PG_FUNCTION_ARGS);
Datum plls_call_handler(PG_FUNCTION_ARGS);
Datum plls_call_validator(PG_FUNCTION_ARGS);
void _PG_init(void);
#if PG_VERSION_NUM >= 90000
PG_FUNCTION_INFO_V1(plv8_inline_handler);
PG_FUNCTION_INFO_V1(plcoffee_inline_handler);
PG_FUNCTION_INFO_V1(plls_inline_handler);
Datum plv8_inline_handler(PG_FUNCTION_ARGS);
Datum plcoffee_inline_handler(PG_FUNCTION_ARGS);
Datum plls_inline_handler(PG_FUNCTION_ARGS);
#endif
} // extern "C"
using namespace v8;
typedef struct plv8_proc_cache
{
Oid fn_oid;
Persistent<Function> function;
char proname[NAMEDATALEN];
char *prosrc;
TransactionId fn_xmin;
ItemPointerData fn_tid;
Oid user_id;
int nargs;
bool retset; /* true if SRF */
Oid rettype;
Oid argtypes[FUNC_MAX_ARGS];
} plv8_proc_cache;
Isolate* plv8_isolate = NULL;
/*
* The function and context are created at the first invocation. Their
* lifetime is same as plv8_proc, but they are not palloc'ed memory,
* so we need to clear them at the end of transaction.
*/
typedef struct plv8_exec_env
{
Persistent<Object> recv;
Persistent<Context> context;
Local<Context> localContext() { return Local<Context>::New(plv8_isolate, context) ; }
struct plv8_exec_env *next;
} plv8_exec_env;
/*
* We cannot cache plv8_type inter executions because it has FmgrInfo fields.
* So, we cache rettype and argtype in fn_extra only during one execution.
*/
typedef struct plv8_proc
{
plv8_proc_cache *cache;
plv8_exec_env *xenv;
TypeFuncClass functypclass; /* For SRF */
plv8_type rettype;
plv8_type argtypes[FUNC_MAX_ARGS];
} plv8_proc;
/*
* For the security reasons, the global context is separated
* between users and it's associated with user id.
*/
typedef struct plv8_context
{
Persistent<Context> context;
Local<Context> localContext() { return Local<Context>::New(plv8_isolate, context) ; }
Oid user_id;
} plv8_context;
static HTAB *plv8_proc_cache_hash = NULL;
static plv8_exec_env *exec_env_head = NULL;
extern const unsigned char coffee_script_binary_data[];
extern const unsigned char livescript_binary_data[];
class Plv8ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
virtual void* Allocate(size_t length) {
void* data = AllocateUninitialized(length);
return data == NULL ? data : memset(data, 0, length);
}
virtual void* AllocateUninitialized(size_t length) {
void *data = NULL;
PG_TRY();
{
data = palloc(length);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
return data;
}
virtual void Free(void* data, size_t) {
PG_TRY();
{
pfree(data);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
}
};
/*
* lower_case_functions are postgres-like C functions.
* They could raise errors with elog/ereport(ERROR).
*/
static plv8_proc *plv8_get_proc(Oid fn_oid, FunctionCallInfo fcinfo,
bool validate, char ***argnames) throw();
static void plv8_xact_cb(XactEvent event, void *arg);
/*
* CamelCaseFunctions are C++ functions.
* They could raise errors with C++ throw statements, or never throw exceptions.
*/
static plv8_exec_env *CreateExecEnv(Handle<Function> script);
static plv8_exec_env *CreateExecEnv(Persistent<Function>& script);
static plv8_proc *Compile(Oid fn_oid, FunctionCallInfo fcinfo,
bool validate, bool is_trigger, Dialect dialect);
static Local<Function> CompileFunction(Persistent<Context>& global_context,
const char *proname, int proarglen,
const char *proargs[], const char *prosrc,
bool is_trigger, bool retset, Dialect dialect);
static Datum CallFunction(PG_FUNCTION_ARGS, plv8_exec_env *xenv,
int nargs, plv8_type argtypes[], plv8_type *rettype);
static Datum CallSRFunction(PG_FUNCTION_ARGS, plv8_exec_env *xenv,
int nargs, plv8_type argtypes[], plv8_type *rettype);
static Datum CallTrigger(PG_FUNCTION_ARGS, plv8_exec_env *xenv);
static void GetGlobalContext(Persistent<Context>& global_context);
static Local<ObjectTemplate> GetGlobalObjectTemplate();
/* A GUC to specify a custom start up function to call */
static char *plv8_start_proc = NULL;
/* A GUC to specify V8 flags (e.g. --es_staging) */
static char *plv8_v8_flags = NULL;
/* A GUC to specify the remote debugger port */
static int plv8_debugger_port;
/*
* We use vector instead of hash since the size of this array
* is expected to be short in most cases.
*/
static std::vector<plv8_context *> ContextVector;
#ifdef ENABLE_DEBUGGER_SUPPORT
v8::Persistent<v8::Context> debug_message_context;
void DispatchDebugMessages() {
// We are in some random thread. We should already have v8::Locker acquired
// (we requested this when registered this callback). We was called
// because new debug messages arrived; they may have already been processed,
// but we shouldn't worry about this.
//
// All we have to do is to set context and call ProcessDebugMessages.
//
// We should decide which V8 context to use here. This is important for
// "evaluate" command, because it must be executed some context.
// In our sample we have only one context, so there is nothing really to
// think about.
v8::Context::Scope scope(debug_message_context);
v8::Debug::ProcessDebugMessages();
}
#endif // ENABLE_DEBUGGER_SUPPORT
void
_PG_init(void)
{
HASHCTL hash_ctl = { 0 };
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(plv8_proc_cache);
hash_ctl.hash = oid_hash;
plv8_proc_cache_hash = hash_create("PLv8 Procedures", 32,
&hash_ctl, HASH_ELEM | HASH_FUNCTION);
DefineCustomStringVariable("plv8.start_proc",
gettext_noop("PLV8 function to run once when PLV8 is first used."),
NULL,
&plv8_start_proc,
NULL,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
DefineCustomStringVariable("plv8.v8_flags",
gettext_noop("V8 engine initialization flags (e.g. --es_staging for additional ES6 features)."),
NULL,
&plv8_v8_flags,
NULL,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
DefineCustomIntVariable("plv8.debugger_port",
gettext_noop("V8 remote debug port."),
gettext_noop("The default value is 35432. "
"This is effective only if PLV8 is built with ENABLE_DEBUGGER_SUPPORT."),
&plv8_debugger_port,
35432, 0, 65536,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
RegisterXactCallback(plv8_xact_cb, NULL);
EmitWarningsOnPlaceholders("plv8");
V8::SetArrayBufferAllocator(new Plv8ArrayBufferAllocator);
V8::InitializeICU();
Platform* platform = platform::CreateDefaultPlatform();
V8::InitializePlatform(platform);
V8::Initialize();
if (plv8_v8_flags != NULL) {
V8::SetFlagsFromString(plv8_v8_flags, strlen(plv8_v8_flags));
}
plv8_isolate = Isolate::New();
plv8_isolate->Enter();
}
static void
plv8_xact_cb(XactEvent event, void *arg)
{
plv8_exec_env *env = exec_env_head;
while (env)
{
if (!env->recv.IsEmpty())
{
env->recv.Reset();
}
env = env->next;
/*
* Each item was allocated in TopTransactionContext, so
* it will be freed eventually.
*/
}
exec_env_head = NULL;
}
static inline plv8_exec_env *
plv8_new_exec_env()
{
plv8_exec_env *xenv = (plv8_exec_env *)
MemoryContextAllocZero(TopTransactionContext, sizeof(plv8_exec_env));
new(&xenv->context) Persistent<Context>();
new(&xenv->recv) Persistent<Object>();
/*
* Add it to the list, which will be freed in the end of top transaction.
*/
xenv->next = exec_env_head;
exec_env_head = xenv;
return xenv;
}
static Datum
common_pl_call_handler(PG_FUNCTION_ARGS, Dialect dialect) throw()
{
Oid fn_oid = fcinfo->flinfo->fn_oid;
bool is_trigger = CALLED_AS_TRIGGER(fcinfo);
try
{
#ifdef ENABLE_DEBUGGER_SUPPORT
Locker lock;
#endif // ENABLE_DEBUGGER_SUPPORT
HandleScope handle_scope(plv8_isolate);
if (!fcinfo->flinfo->fn_extra)
{
plv8_proc *proc = Compile(fn_oid, fcinfo,
false, is_trigger, dialect);
proc->xenv = CreateExecEnv(proc->cache->function);
fcinfo->flinfo->fn_extra = proc;
}
plv8_proc *proc = (plv8_proc *) fcinfo->flinfo->fn_extra;
plv8_proc_cache *cache = proc->cache;
if (is_trigger)
return CallTrigger(fcinfo, proc->xenv);
else if (cache->retset)
return CallSRFunction(fcinfo, proc->xenv,
cache->nargs, proc->argtypes, &proc->rettype);
else
return CallFunction(fcinfo, proc->xenv,
cache->nargs, proc->argtypes, &proc->rettype);
}
catch (js_error& e) { e.rethrow(); }
catch (pg_error& e) { e.rethrow(); }
return (Datum) 0; // keep compiler quiet
}
Datum
plv8_call_handler(PG_FUNCTION_ARGS)
{
return common_pl_call_handler(fcinfo, PLV8_DIALECT_NONE);
}
Datum
plcoffee_call_handler(PG_FUNCTION_ARGS)
{
return common_pl_call_handler(fcinfo, PLV8_DIALECT_COFFEE);
}
Datum
plls_call_handler(PG_FUNCTION_ARGS)
{
return common_pl_call_handler(fcinfo, PLV8_DIALECT_LIVESCRIPT);
}
#if PG_VERSION_NUM >= 90000
static Datum
common_pl_inline_handler(PG_FUNCTION_ARGS, Dialect dialect) throw()
{
InlineCodeBlock *codeblock = (InlineCodeBlock *) DatumGetPointer(PG_GETARG_DATUM(0));
Assert(IsA(codeblock, InlineCodeBlock));
try
{
#ifdef ENABLE_DEBUGGER_SUPPORT
Locker lock;
#endif // ENABLE_DEBUGGER_SUPPORT
HandleScope handle_scope(plv8_isolate);
char *source_text = codeblock->source_text;
Persistent<Context> global_context;
GetGlobalContext(global_context);
Local<Function> function = CompileFunction(global_context,
NULL, 0, NULL,
source_text, false, false, dialect);
plv8_exec_env *xenv = CreateExecEnv(function);
return CallFunction(fcinfo, xenv, 0, NULL, NULL);
}
catch (js_error& e) { e.rethrow(); }
catch (pg_error& e) { e.rethrow(); }
return (Datum) 0; // keep compiler quiet
}
Datum
plv8_inline_handler(PG_FUNCTION_ARGS)
{
return common_pl_inline_handler(fcinfo, PLV8_DIALECT_NONE);
}
Datum
plcoffee_inline_handler(PG_FUNCTION_ARGS)
{
return common_pl_inline_handler(fcinfo, PLV8_DIALECT_COFFEE);
}
Datum
plls_inline_handler(PG_FUNCTION_ARGS)
{
return common_pl_inline_handler(fcinfo, PLV8_DIALECT_LIVESCRIPT);
}
#endif
/*
* DoCall -- Call a JS function with SPI support.
*
* This function could throw C++ exceptions, but must not throw PG exceptions.
*/
static Local<v8::Value>
DoCall(Handle<Function> fn, Handle<Object> receiver,
int nargs, Handle<v8::Value> args[])
{
TryCatch try_catch;
if (SPI_connect() != SPI_OK_CONNECT)
throw js_error("could not connect to SPI manager");
Local<v8::Value> result = fn->Call(receiver, nargs, args);
int status = SPI_finish();
if (result.IsEmpty())
throw js_error(try_catch);
if (status < 0)
throw js_error(FormatSPIStatus(status));
return result;
}
static Datum
CallFunction(PG_FUNCTION_ARGS, plv8_exec_env *xenv,
int nargs, plv8_type argtypes[], plv8_type *rettype)
{
Local<Context> context = xenv->localContext();
Context::Scope context_scope(context);
Handle<v8::Value> args[FUNC_MAX_ARGS];
Handle<Object> plv8obj;
WindowFunctionSupport support(context, fcinfo);
/*
* In window function case, we cannot see the argument datum
* in fcinfo. Instead, get them by WinGetFuncArgCurrent().
*/
if (support.IsWindowCall())
{
WindowObject winobj = support.GetWindowObject();
for (int i = 0; i < nargs; i++)
{
bool isnull;
Datum arg = WinGetFuncArgCurrent(winobj, i, &isnull);
args[i] = ToValue(arg, isnull, &argtypes[i]);
}
}
else
{
for (int i = 0; i < nargs; i++)
args[i] = ToValue(fcinfo->arg[i], fcinfo->argnull[i], &argtypes[i]);
}
Local<Object> recv = Local<Object>::New(plv8_isolate, xenv->recv);
Local<Function> fn =
Local<Function>::Cast(recv->GetInternalField(0));
Local<v8::Value> result =
DoCall(fn, recv, nargs, args);
if (rettype)
return ToDatum(result, &fcinfo->isnull, rettype);
else
PG_RETURN_VOID();
}
static Tuplestorestate *
CreateTupleStore(PG_FUNCTION_ARGS, TupleDesc *tupdesc)
{
Tuplestorestate *tupstore;
PG_TRY();
{
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
MemoryContext per_query_ctx;
MemoryContext oldcontext;
plv8_proc *proc = (plv8_proc *) fcinfo->flinfo->fn_extra;
/* check to see if caller supports us returning a tuplestore */
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("set-valued function called in context that cannot accept a set")));
if (!(rsinfo->allowedModes & SFRM_Materialize))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("materialize mode required, but it is not " \
"allowed in this context")));
if (!proc->functypclass)
proc->functypclass = get_call_result_type(fcinfo, NULL, NULL);
per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
oldcontext = MemoryContextSwitchTo(per_query_ctx);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->returnMode = SFRM_Materialize;
rsinfo->setResult = tupstore;
/* Build a tuple descriptor for our result type */
if (proc->rettype.typid == RECORDOID)
{
if (proc->functypclass != TYPEFUNC_COMPOSITE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
}
if (!rsinfo->setDesc)
{
*tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
rsinfo->setDesc = *tupdesc;
}
else
*tupdesc = rsinfo->setDesc;
MemoryContextSwitchTo(oldcontext);
}
PG_CATCH();
{
throw pg_error();
}
PG_END_TRY();
return tupstore;
}
static Datum
CallSRFunction(PG_FUNCTION_ARGS, plv8_exec_env *xenv,
int nargs, plv8_type argtypes[], plv8_type *rettype)
{
plv8_proc *proc = (plv8_proc *) fcinfo->flinfo->fn_extra;
TupleDesc tupdesc;
Tuplestorestate *tupstore;
tupstore = CreateTupleStore(fcinfo, &tupdesc);
Handle<Context> context = xenv->localContext();
Context::Scope context_scope(context);
Converter conv(tupdesc, proc->functypclass == TYPEFUNC_SCALAR);
Handle<v8::Value> args[FUNC_MAX_ARGS + 1];
/*
* In case this is nested via SPI, stash pre-registered converters
* for the previous SRF.
*/
SRFSupport support(context, &conv, tupstore);
for (int i = 0; i < nargs; i++)
args[i] = ToValue(fcinfo->arg[i], fcinfo->argnull[i], &argtypes[i]);
Local<Object> recv = Local<Object>::New(plv8_isolate, xenv->recv);
Local<Function> fn =
Local<Function>::Cast(recv->GetInternalField(0));
Handle<v8::Value> result = DoCall(fn, recv, nargs, args);
if (result->IsUndefined())
{
// no additional values
}
else if (result->IsArray())
{
Handle<Array> array = Handle<Array>::Cast(result);
// return an array of records.
int length = array->Length();
for (int i = 0; i < length; i++)
conv.ToDatum(array->Get(i), tupstore);
}
else
{
// return a record or a scalar
conv.ToDatum(result, tupstore);
}
/* clean up and return the tuplestore */
tuplestore_donestoring(tupstore);
return (Datum) 0;
}
static Datum
CallTrigger(PG_FUNCTION_ARGS, plv8_exec_env *xenv)
{
// trigger arguments are:
// 0: NEW
// 1: OLD
// 2: TG_NAME
// 3: TG_WHEN
// 4: TG_LEVEL
// 5: TG_OP
// 6: TG_RELID
// 7: TG_TABLE_NAME
// 8: TG_TABLE_SCHEMA
// 9: TG_ARGV
TriggerData *trig = (TriggerData *) fcinfo->context;
Relation rel = trig->tg_relation;
TriggerEvent event = trig->tg_event;
Handle<v8::Value> args[10];
Datum result = (Datum) 0;
Handle<Context> context = xenv->localContext();
Context::Scope context_scope(context);
if (TRIGGER_FIRED_FOR_ROW(event))
{
TupleDesc tupdesc = RelationGetDescr(rel);
Converter conv(tupdesc);
if (TRIGGER_FIRED_BY_INSERT(event))
{
result = PointerGetDatum(trig->tg_trigtuple);
// NEW
args[0] = conv.ToValue(trig->tg_trigtuple);
// OLD
args[1] = Undefined(plv8_isolate);
}
else if (TRIGGER_FIRED_BY_DELETE(event))
{
result = PointerGetDatum(trig->tg_trigtuple);
// NEW
args[0] = Undefined(plv8_isolate);
// OLD
args[1] = conv.ToValue(trig->tg_trigtuple);
}
else if (TRIGGER_FIRED_BY_UPDATE(event))
{
result = PointerGetDatum(trig->tg_newtuple);
// NEW
args[0] = conv.ToValue(trig->tg_newtuple);
// OLD
args[1] = conv.ToValue(trig->tg_trigtuple);
}
}
else
{
args[0] = args[1] = Undefined(plv8_isolate);
}
// 2: TG_NAME
args[2] = ToString(trig->tg_trigger->tgname);
// 3: TG_WHEN
if (TRIGGER_FIRED_BEFORE(event))
args[3] = String::NewFromUtf8(plv8_isolate, "BEFORE");
else
args[3] = String::NewFromUtf8(plv8_isolate, "AFTER");
// 4: TG_LEVEL
if (TRIGGER_FIRED_FOR_ROW(event))
args[4] = String::NewFromUtf8(plv8_isolate, "ROW");
else
args[4] = String::NewFromUtf8(plv8_isolate, "STATEMENT");
// 5: TG_OP
if (TRIGGER_FIRED_BY_INSERT(event))
args[5] = String::NewFromUtf8(plv8_isolate, "INSERT");
else if (TRIGGER_FIRED_BY_DELETE(event))
args[5] = String::NewFromUtf8(plv8_isolate, "DELETE");
else if (TRIGGER_FIRED_BY_UPDATE(event))
args[5] = String::NewFromUtf8(plv8_isolate, "UPDATE");
#ifdef TRIGGER_FIRED_BY_TRUNCATE
else if (TRIGGER_FIRED_BY_TRUNCATE(event))
args[5] = String::NewFromUtf8(plv8_isolate, "TRUNCATE");
#endif
else
args[5] = String::NewFromUtf8(plv8_isolate, "?");
// 6: TG_RELID
args[6] = Uint32::New(plv8_isolate, RelationGetRelid(rel));
// 7: TG_TABLE_NAME
args[7] = ToString(RelationGetRelationName(rel));
// 8: TG_TABLE_SCHEMA
args[8] = ToString(get_namespace_name(RelationGetNamespace(rel)));
// 9: TG_ARGV
Handle<Array> tgargs = Array::New(plv8_isolate, trig->tg_trigger->tgnargs);
for (int i = 0; i < trig->tg_trigger->tgnargs; i++)
tgargs->Set(i, ToString(trig->tg_trigger->tgargs[i]));
args[9] = tgargs;
TryCatch try_catch;
Local<Object> recv = Local<Object>::New(plv8_isolate, xenv->recv);
Local<Function> fn =
Local<Function>::Cast(recv->GetInternalField(0));
Handle<v8::Value> newtup =
DoCall(fn, recv, lengthof(args), args);
if (newtup.IsEmpty())
throw js_error(try_catch);
/*
* If the function specifically returned null, return NULL to
* tell executor to skip the operation. Otherwise, the function
* result is the tuple to be returned.
*/
if (newtup->IsNull() || !TRIGGER_FIRED_FOR_ROW(event))
{
result = PointerGetDatum(NULL);
}
else if (!newtup->IsUndefined())
{
TupleDesc tupdesc = RelationGetDescr(rel);
Converter conv(tupdesc);
HeapTupleHeader header;
header = DatumGetHeapTupleHeader(conv.ToDatum(newtup));
/* We know it's there; heap_form_tuple stores with this layout. */
result = PointerGetDatum((char *) header - HEAPTUPLESIZE);
}
return result;
}
static Datum
common_pl_call_validator(PG_FUNCTION_ARGS, Dialect dialect) throw()
{
Oid fn_oid = PG_GETARG_OID(0);
HeapTuple tuple;
Form_pg_proc proc;
char functyptype;
bool is_trigger = false;
if (!CheckFunctionValidatorAccess(fcinfo->flinfo->fn_oid, fn_oid))
PG_RETURN_VOID();
/* Get the new function's pg_proc entry */
tuple = SearchSysCache(PROCOID, ObjectIdGetDatum(fn_oid), 0, 0, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for function %u", fn_oid);
proc = (Form_pg_proc) GETSTRUCT(tuple);
functyptype = get_typtype(proc->prorettype);
/* Disallow pseudotype result */
/* except for TRIGGER, RECORD, INTERNAL, VOID or polymorphic types */
if (functyptype == TYPTYPE_PSEUDO)
{
/* we assume OPAQUE with no arguments means a trigger */
if (proc->prorettype == TRIGGEROID ||
(proc->prorettype == OPAQUEOID && proc->pronargs == 0))
is_trigger = true;
else if (proc->prorettype != RECORDOID &&
proc->prorettype != VOIDOID &&
proc->prorettype != INTERNALOID &&
!IsPolymorphicType(proc->prorettype))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/v8 functions cannot return type %s",
format_type_be(proc->prorettype))));
}
ReleaseSysCache(tuple);
try
{
#ifdef ENABLE_DEBUGGER_SUPPORT
Locker lock;
#endif // ENABLE_DEBUGGER_SUPPORT
/* Don't use validator's fcinfo */
plv8_proc *proc = Compile(fn_oid, NULL,
true, is_trigger, dialect);
(void) CreateExecEnv(proc->cache->function);
/* the result of a validator is ignored */
PG_RETURN_VOID();
}
catch (js_error& e) { e.rethrow(); }
catch (pg_error& e) { e.rethrow(); }
return (Datum) 0; // keep compiler quiet
}
Datum
plv8_call_validator(PG_FUNCTION_ARGS)
{
return common_pl_call_validator(fcinfo, PLV8_DIALECT_NONE);
}
Datum
plcoffee_call_validator(PG_FUNCTION_ARGS)
{
return common_pl_call_validator(fcinfo, PLV8_DIALECT_COFFEE);
}
Datum
plls_call_validator(PG_FUNCTION_ARGS)
{
return common_pl_call_validator(fcinfo, PLV8_DIALECT_LIVESCRIPT);
}
static plv8_proc *
plv8_get_proc(Oid fn_oid, FunctionCallInfo fcinfo, bool validate, char ***argnames) throw()
{
HeapTuple procTup;
plv8_proc_cache *cache;
bool found;
bool isnull;
Datum prosrc;
Oid *argtypes;
char *argmodes;
MemoryContext oldcontext;
procTup = SearchSysCache(PROCOID, ObjectIdGetDatum(fn_oid), 0, 0, 0);
if (!HeapTupleIsValid(procTup))
elog(ERROR, "cache lookup failed for function %u", fn_oid);
cache = (plv8_proc_cache *)
hash_search(plv8_proc_cache_hash,&fn_oid, HASH_ENTER, &found);
if (found)
{
bool uptodate;
/*
* We need to check user id and dispose it if it's different from
* the previous cache user id, as the V8 function is associated
* with the context where it was generated. In most cases,
* we can expect this doesn't affect runtime performance.
*/
uptodate = (!cache->function.IsEmpty() &&
cache->fn_xmin == HeapTupleHeaderGetXmin(procTup->t_data) &&
ItemPointerEquals(&cache->fn_tid, &procTup->t_self) &&
cache->user_id == GetUserId());
if (!uptodate)
{
if (cache->prosrc)
{
pfree(cache->prosrc);
cache->prosrc = NULL;
}
cache->function.Reset();
}
else
{
ReleaseSysCache(procTup);
}
}
else
{
new(&cache->function) Persistent<Function>();
cache->prosrc = NULL;
}
if (cache->function.IsEmpty())
{
Form_pg_proc procStruct;
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
prosrc = SysCacheGetAttr(PROCOID, procTup, Anum_pg_proc_prosrc, &isnull);
if (isnull)
elog(ERROR, "null prosrc");
cache->retset = procStruct->proretset;
cache->rettype = procStruct->prorettype;
strlcpy(cache->proname, NameStr(procStruct->proname), NAMEDATALEN);
cache->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
cache->fn_tid = procTup->t_self;
cache->user_id = GetUserId();
int nargs = get_func_arg_info(procTup, &argtypes, argnames, &argmodes);
if (validate)
{
/*
* Disallow non-polymorphic pseudotypes in arguments
* (either IN or OUT). Internal type is used to declare
* js functions for find_function().
*/
for (int i = 0; i < nargs; i++)
{
if (get_typtype(argtypes[i]) == TYPTYPE_PSEUDO &&
argtypes[i] != INTERNALOID &&
!IsPolymorphicType(argtypes[i]))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("PL/v8 functions cannot accept type %s",
format_type_be(argtypes[i]))));
}
}
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
cache->prosrc = TextDatumGetCString(prosrc);
MemoryContextSwitchTo(oldcontext);
ReleaseSysCache(procTup);
int inargs = 0;
for (int i = 0; i < nargs; i++)
{
Oid argtype = argtypes[i];
char argmode = argmodes ? argmodes[i] : PROARGMODE_IN;
switch (argmode)
{
case PROARGMODE_IN:
case PROARGMODE_INOUT:
case PROARGMODE_VARIADIC:
break;
default:
continue;
}
if (*argnames)
(*argnames)[inargs] = (*argnames)[i];
cache->argtypes[inargs] = argtype;
inargs++;
}
cache->nargs = inargs;
}
MemoryContext mcxt = CurrentMemoryContext;
if (fcinfo)
mcxt = fcinfo->flinfo->fn_mcxt;
plv8_proc *proc = (plv8_proc *) MemoryContextAllocZero(mcxt,
offsetof(plv8_proc, argtypes) + sizeof(plv8_type) * cache->nargs);
proc->cache = cache;
for (int i = 0; i < cache->nargs; i++)
{
Oid argtype = cache->argtypes[i];
/* Resolve polymorphic types, if this is an actual call context. */
if (fcinfo && IsPolymorphicType(argtype))
argtype = get_fn_expr_argtype(fcinfo->flinfo, i);
plv8_fill_type(&proc->argtypes[i], argtype, mcxt);
}
Oid rettype = cache->rettype;
/* Resolve polymorphic return type if this is an actual call context. */
if (fcinfo && IsPolymorphicType(rettype))
rettype = get_fn_expr_rettype(fcinfo->flinfo);
plv8_fill_type(&proc->rettype, rettype, mcxt);
return proc;
}
static plv8_exec_env *
CreateExecEnv(Persistent<Function>& function)
{
plv8_exec_env *xenv;
HandleScope handle_scope(plv8_isolate);
PG_TRY();
{
xenv = plv8_new_exec_env();
}
PG_CATCH();
{
throw pg_error();
}