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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"
#ifdef _MSC_VER
#undef open
#endif
#include "libplatform/libplatform.h"
#include "plv8_allocator.h"
extern "C" {
#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/guc_tables.h"
#include "utils/memutils.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#if PG_VERSION_NUM >= 120000
#include "catalog/pg_database.h"
#endif
#if PG_VERSION_NUM >= 130000
#include "common/hashfn.h"
#endif
#include <signal.h>
#ifdef EXECUTION_TIMEOUT
#ifdef _MSC_VER
#include <windows.h>
#else
#include <unistd.h>
#endif
#endif
PG_MODULE_MAGIC;
PGDLLEXPORT Datum plv8_call_handler(PG_FUNCTION_ARGS);
PGDLLEXPORT Datum plv8_call_validator(PG_FUNCTION_ARGS);
PGDLLEXPORT Datum plv8_reset(PG_FUNCTION_ARGS);
PGDLLEXPORT Datum plv8_info(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(plv8_call_handler);
PG_FUNCTION_INFO_V1(plv8_call_validator);
PG_FUNCTION_INFO_V1(plv8_reset);
PG_FUNCTION_INFO_V1(plv8_info);
PGDLLEXPORT void _PG_init(void);
#if PG_VERSION_NUM >= 90000
PGDLLEXPORT Datum plv8_inline_handler(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(plv8_inline_handler);
#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;
plv8_context *current_context = nullptr;
size_t plv8_memory_limit = 0;
size_t plv8_last_heap_size = 0;
/*
* 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
{
Isolate *isolate;
Persistent<Object> recv;
Persistent<Context> context;
Local<Context> localContext() { return Local<Context>::New(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;
static HTAB *plv8_proc_cache_hash = NULL;
static plv8_exec_env *exec_env_head = NULL;
static void killPlv8Context(plv8_context *ctx);
/*
* 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> function, plv8_context *context);
static plv8_exec_env *CreateExecEnv(Persistent<Function>& function, plv8_context *context);
static plv8_proc *Compile(Oid fn_oid, FunctionCallInfo fcinfo,
bool validate, bool is_trigger);
static Local<Function> CompileFunction(plv8_context *global_context,
const char *proname, int proarglen,
const char *proargs[], const char *prosrc,
bool is_trigger, bool retset);
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 plv8_context *GetPlv8Context();
static Local<ObjectTemplate> GetGlobalObjectTemplate(Isolate *isolate);
static void CreateIsolate(plv8_context *context);
/* 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 ICU data directory */
static char *plv8_icu_data = NULL;
/* A GUC to specify the remote debugger port */
static int plv8_debugger_port;
#ifdef EXECUTION_TIMEOUT
static int plv8_execution_timeout = 300;
#endif
static std::unique_ptr<v8::Platform> v8_platform = NULL;
/*
* 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 OOMErrorHandler(const char* location, const v8::OOMDetails &) {
Isolate *isolate = Isolate::GetCurrent();
isolate->TerminateExecution();
// set it to kill the user context and isolate
current_context->is_dead = true;
elog(ERROR, "Out of memory error");
}
void GCEpilogueCallback(Isolate* isolate, GCType type, GCCallbackFlags /* flags */) {
HeapStatistics heap_statistics;
isolate->GetHeapStatistics(&heap_statistics);
//elog(NOTICE, "Current memory: %lld => %lld", heap_statistics.used_heap_size(), plv8_memory_limit * 1_MB);
if (type != GCType::kGCTypeIncrementalMarking
&& heap_statistics.used_heap_size() > plv8_memory_limit * 1_MB) {
//elog(NOTICE, "Terminating");
const char *error_message = "Out of memory";
Local<v8::String> result = ToString(error_message, 13);
isolate->ThrowException(result);
//isolate->setData(MEM_SOFTLIMIT_REACHED);
isolate->TerminateExecution();
}
if (heap_statistics.used_heap_size() > plv8_memory_limit * 1_MB / 0.9
&& plv8_last_heap_size < plv8_memory_limit * 1_MB / 0.9) {
isolate->LowMemoryNotification();
}
plv8_last_heap_size = heap_statistics.used_heap_size();
}
size_t NearHeapLimitHandler(void* data, size_t current_heap_limit,
size_t initial_heap_limit) {
Isolate *isolate = Isolate::GetCurrent();
isolate->TerminateExecution();
// need to give back more space
// to make sure it can unwind the stack and process exceptions
return current_heap_limit + 1_MB;
}
void PromiseRejectCB(PromiseRejectMessage rejection) {
auto event = rejection.GetEvent();
if (event == kPromiseRejectAfterResolved || event == kPromiseResolveAfterResolved)
return;
auto promise = rejection.GetPromise();
auto isolate = promise->GetIsolate();
if (rejection.GetEvent() == v8::kPromiseHandlerAddedAfterReject) {
if (current_context->ignore_unhandled_promises) return;
// Remove handled promises from the list
auto& unhandled_promises = current_context->unhandled_promises;
for (auto it = unhandled_promises.begin(); it != unhandled_promises.end(); ++it) {
auto unhandled_promise = std::get<0>(*it).Get(isolate);
if (unhandled_promise == promise) {
unhandled_promises.erase(it--);
}
}
return;
}
auto exception = rejection.GetValue();
Local<Message> message;
// Assume that all objects are stack-traces.
if (exception->IsObject()) {
message = Exception::CreateMessage(isolate, exception);
}
if (!exception->IsNativeError() &&
(message.IsEmpty() || message->GetStackTrace().IsEmpty())) {
// If there is no real Error object, manually throw and catch a stack trace.
TryCatch try_catch(isolate);
try_catch.SetVerbose(true);
isolate->ThrowException(Exception::Error(
v8::String::NewFromUtf8Literal(isolate, "Unhandled Promise.")));
message = try_catch.Message();
exception = try_catch.Exception();
}
if (current_context->ignore_unhandled_promises) return;
current_context->unhandled_promises.emplace_back(
v8::Global<v8::Promise>(isolate, promise),
v8::Global<v8::Message>(isolate, message),
v8::Global<v8::Value>(isolate, exception));
}
void HandleUnhandledPromiseRejections() {
// Avoid recursive calls to HandleUnhandledPromiseRejections.
auto isolate = current_context->isolate;
if (current_context->ignore_unhandled_promises) return;
current_context->ignore_unhandled_promises = true;
HandleScope scope(isolate);
// Ignore promises that get added during error reporting.
size_t i = 0;
auto& unhandled_promises = current_context->unhandled_promises;
for (; i < unhandled_promises.size(); i++) {
const auto& tuple = unhandled_promises[i];
Local<v8::Message> message = std::get<1>(tuple).Get(isolate);
Local<v8::Value> exception = std::get<2>(tuple).Get(isolate);
js_error error(isolate, exception, message);
error.log(WARNING, "Unhandled Promise rejection: %s");
}
unhandled_promises.clear();
current_context->ignore_unhandled_promises = false;
}
static void
CreateIsolate(plv8_context *context) {
Isolate *isolate;
Isolate::CreateParams params;
params.array_buffer_allocator = new ArrayAllocator(plv8_memory_limit * 1_MB);
//params.array_buffer_allocator =
// v8::ArrayBuffer::Allocator::NewDefaultAllocator();
ResourceConstraints rc;
rc.ConfigureDefaults(plv8_memory_limit * 1_MB * 2, plv8_memory_limit * 1_MB * 2);
params.constraints = rc;
isolate = Isolate::New(params);
isolate->SetOOMErrorHandler(OOMErrorHandler);
isolate->AddGCEpilogueCallback(GCEpilogueCallback);
isolate->AddNearHeapLimitCallback(NearHeapLimitHandler, NULL);
isolate->SetPromiseRejectCallback(PromiseRejectCB);
context->isolate = isolate;
context->array_buffer_allocator = params.array_buffer_allocator;
}
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);
config_generic *guc_value;
#define START_PROC_VAR "plv8.start_proc"
guc_value = plv8_find_option(START_PROC_VAR);
if (guc_value != NULL) {
plv8_start_proc = plv8_string_option(guc_value);
} else {
DefineCustomStringVariable(START_PROC_VAR,
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);
}
#undef START_PROC_VAR
#define ICU_DATA_VAR "plv8.icu_data"
guc_value = plv8_find_option(ICU_DATA_VAR);
if (guc_value != NULL) {
plv8_start_proc = plv8_string_option(guc_value);
} else {
DefineCustomStringVariable(ICU_DATA_VAR,
gettext_noop("ICU data file directory."),
NULL,
&plv8_icu_data,
NULL,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
}
#undef ICU_DATA_VAR
#define V8_FLAGS_VAR "plv8.v8_flags"
guc_value = plv8_find_option(V8_FLAGS_VAR);
if (guc_value != NULL) {
plv8_start_proc = plv8_string_option(guc_value);
} else {
DefineCustomStringVariable(V8_FLAGS_VAR,
gettext_noop("V8 engine initialization flags (e.g. --harmony for all current harmony features)."),
NULL,
&plv8_v8_flags,
NULL,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
}
#undef V8_FLAGS_VAR
#define DEBUGGER_PORT_VAR "plv8.debugger_port"
guc_value = plv8_find_option(DEBUGGER_PORT_VAR);
if (guc_value != NULL) {
plv8_debugger_port = plv8_int_option(guc_value);
} else {
DefineCustomIntVariable(DEBUGGER_PORT_VAR,
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);
}
#undef DEBUGGER_PORT_VAR
#ifdef EXECUTION_TIMEOUT
#define EXECUTION_TIMEOUT_VAR "plv8.execution_timeout"
guc_value = plv8_find_option(EXECUTION_TIMEOUT_VAR);
if (guc_value != NULL) {
plv8_execution_timeout = plv8_int_option(guc_value);
} else {
DefineCustomIntVariable(EXECUTION_TIMEOUT_VAR,
gettext_noop("V8 execution timeout."),
gettext_noop("The default value is 300 seconds. "
"This allows you to override the default execution timeout."),
&plv8_execution_timeout,
300, 1, 65536,
PGC_USERSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
}
#undef EXECUTION_TIMEOUT_VAR
#endif
#define MEMORY_LIMIT_VAR "plv8.memory_limit"
guc_value = plv8_find_option(MEMORY_LIMIT_VAR);
if (guc_value != NULL) {
plv8_memory_limit = plv8_int_option(guc_value);
} else {
DefineCustomIntVariable(MEMORY_LIMIT_VAR,
gettext_noop("Per-isolate memory limit in MBytes"),
gettext_noop("The default value is 256 MB"),
(int *) &plv8_memory_limit,
256, 256, 3096, // hardcoded v8 limits for isolates
PGC_SUSET, 0,
#if PG_VERSION_NUM >= 90100
NULL,
#endif
NULL,
NULL);
}
#undef MEMORY_LIMIT_VAR
RegisterXactCallback(plv8_xact_cb, NULL);
EmitWarningsOnPlaceholders("plv8");
if (plv8_icu_data == NULL) {
elog(DEBUG1, "no icu dir");
V8::InitializeICU();
} else {
elog(DEBUG1, "init icu data %s", plv8_icu_data);
V8::InitializeICU(plv8_icu_data);
}
#if (V8_MAJOR_VERSION == 4 && V8_MINOR_VERSION >= 6) || V8_MAJOR_VERSION >= 5
V8::InitializeExternalStartupData("plv8");
#endif
if (!v8_platform) {
v8_platform = platform::NewDefaultPlatform();
}
if (plv8_v8_flags != NULL) {
V8::SetFlagsFromString(plv8_v8_flags);
}
V8::InitializePlatform(v8_platform.get());
V8::Initialize();
}
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(Isolate *isolate)
{
plv8_exec_env *xenv = (plv8_exec_env *)
MemoryContextAllocZero(TopTransactionContext, sizeof(plv8_exec_env));
new(&xenv->context) Persistent<Context>();
new(&xenv->recv) Persistent<Object>();
xenv->isolate = isolate;
/*
* 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;
}
Datum
plv8_call_handler(PG_FUNCTION_ARGS)
{
current_context = GetPlv8Context();
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
Isolate::Scope scope(current_context->isolate);
HandleScope handle_scope(current_context->isolate);
if (!fcinfo->flinfo->fn_extra)
{
plv8_proc *proc = Compile(fn_oid, fcinfo,
false, is_trigger);
proc->xenv = CreateExecEnv(proc->cache->function, current_context);
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
}
static void killPlv8Context(plv8_context *ctx) {
HASH_SEQ_STATUS status;
plv8_proc_cache* cache;
// need to search and reset all the user functions which were created in the old context
hash_seq_init(&status, plv8_proc_cache_hash);
cache = (plv8_proc_cache *) hash_seq_search(&status);
while (cache != nullptr) {
if (cache->user_id == ctx->user_id) {
if (cache->prosrc)
{
pfree(cache->prosrc);
cache->prosrc = NULL;
}
cache->function.Reset();
}
cache = (plv8_proc_cache *) hash_seq_search(&status);
}
ctx->isolate->Dispose();
delete ctx->array_buffer_allocator;
}
Datum
plv8_reset(PG_FUNCTION_ARGS)
{
Oid user_id = GetUserId();
unsigned long i;
for (i = 0; i < ContextVector.size(); i++)
{
if (ContextVector[i]->user_id == user_id)
{
plv8_context * context = ContextVector[i];
ContextVector.erase(ContextVector.begin() + i);
killPlv8Context(context);
pfree(context);
break;
}
}
return (Datum) 0;
}
Datum
plv8_info(PG_FUNCTION_ARGS)
{
unsigned long i;
unsigned long size = ContextVector.size();
char **infos = nullptr;
size_t *lengths = nullptr;
size_t total_length = 3; // length of "[]\0"
MemoryContext execution_context, old_context;
if (size == 0)
{
PG_RETURN_NULL();
}
#if PG_VERSION_NUM < 110000
execution_context = AllocSetContextCreate(
CurrentMemoryContext,
"plv8_info Context",
ALLOCSET_SMALL_MINSIZE,
ALLOCSET_SMALL_INITSIZE,
ALLOCSET_SMALL_MAXSIZE);
#else
execution_context = AllocSetContextCreate(CurrentMemoryContext,
"plv8_info Context",
ALLOCSET_SMALL_SIZES);
#endif
old_context = MemoryContextSwitchTo(execution_context);
infos = (char **) palloc(sizeof(char *) * size);
lengths = (size_t *) palloc(sizeof(size_t) * size);
for (i = 0; i < size; i++)
{
Isolate *isolate = ContextVector[i]->isolate;
Isolate::Scope scope(isolate);
HandleScope handle_scope(isolate);
Local<Context> context = ContextVector[i]->localContext();
Context::Scope context_scope(context);
JSONObject JSON;
Local<v8::Value> result;
Local<v8::Object> obj = v8::Object::New(isolate);
#if PG_VERSION_NUM >= 90500
char *username = GetUserNameFromId(ContextVector[i]->user_id, false);
#else
char *username = GetUserNameFromId(ContextVector[i]->user_id);
#endif
obj->Set(context, v8::String::NewFromUtf8Literal(isolate, "user"),
v8::String::NewFromUtf8(isolate, username).ToLocalChecked()).Check();
GetMemoryInfo(obj);
result = JSON.Stringify(obj);
CString str(result);
infos[i] = pstrdup(str.str());
lengths[i] = strlen(infos[i]);
total_length += lengths[i] + 1; // add 1 byte for ','
}
char *out = (char *) palloc0(total_length);
out[0] = '[';
size_t current = 0;
for (i = 0; i < size; i++)
{
++current;
strcpy(out + current, infos[i]);
current += lengths[i];
if (i != size - 1)
{
out[current] = ',';
}
}
out[current] = ']';
out[current + 1] = '\0';
MemoryContextSwitchTo(old_context);
return CStringGetTextDatum(out);
}
#if PG_VERSION_NUM >= 90000
Datum
plv8_inline_handler(PG_FUNCTION_ARGS)
{
InlineCodeBlock *codeblock = (InlineCodeBlock *) DatumGetPointer(PG_GETARG_DATUM(0));
Assert(IsA(codeblock, InlineCodeBlock));
try
{
#ifdef ENABLE_DEBUGGER_SUPPORT
Locker lock;
#endif // ENABLE_DEBUGGER_SUPPORT
current_context = GetPlv8Context();
Isolate::Scope scope(current_context->isolate);
HandleScope handle_scope(current_context->isolate);
char *source_text = codeblock->source_text;
Persistent<Context> global_context;
global_context.Reset(current_context->isolate, current_context->context);
Local<Function> function = CompileFunction(current_context,
NULL, 0, NULL,
source_text, false, false);
plv8_exec_env *xenv = CreateExecEnv(function, current_context);
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
}
#endif
#ifdef EXECUTION_TIMEOUT
/*
* Breakout -- break out of a Call, with a thread
*
* This function breaks out of a javascript execution context.
*/
#ifdef _MSC_VER // windows
DWORD WINAPI
Breakout (LPVOID lpParam)
{
Isolate *isolate = (Isolate *) lpParam;
Sleep(plv8_execution_timeout * 1000);
isolate->TerminateExecution();
return 0;
}
#else // posix
void *
Breakout (void *d)
{
auto *isolate = (Isolate *) d;
sleep(plv8_execution_timeout);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
isolate->TerminateExecution();
return NULL;
}
#endif
#endif
void *int_handler = NULL;
void *term_handler = NULL;
void *abt_handler = NULL;
/*
* signal handler
*
* This function kills the execution of the v8 process if a signal is called
*/
void
signal_handler (int sig) {
elog(DEBUG1, "cancelling execution");
auto running_context = GetPlv8Context();
running_context->interrupted = true;
running_context->isolate->TerminateExecution();
// call the old handler if it exists
switch(sig) {
case SIGINT:
if (int_handler != NULL) {
((void (*)(int)) int_handler)(sig);
}
break;
case SIGTERM:
if (term_handler != NULL) {
((void (*)(int)) term_handler)(sig);
}
break;
case SIGABRT:
if (abt_handler != NULL) {
((void (*)(int)) abt_handler)(sig);
}
break;
}
}
/*
* 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(Local<Context> ctx, Handle<Function> fn, Handle<Object> receiver,
int nargs, Handle<v8::Value> args[], bool nonatomic)
{
Isolate *isolate = ctx->GetIsolate();
TryCatch try_catch(isolate);
if (isolate->IsExecutionTerminating() || current_context->interrupted) {
isolate->CancelTerminateExecution();
if (current_context->interrupted) {
current_context->interrupted = false;
}
}
#if PG_VERSION_NUM >= 110000
if (SPI_connect_ext(nonatomic ? SPI_OPT_NONATOMIC : 0) != SPI_OK_CONNECT)
throw js_error("could not connect to SPI manager");
#else
if (SPI_connect() != SPI_OK_CONNECT)
throw js_error("could not connect to SPI manager");
#endif
// set up the signal handlers
if (int_handler == NULL) {
int_handler = (void *) signal(SIGINT, signal_handler);
}
if (term_handler == NULL) {
term_handler = (void *) signal(SIGTERM, signal_handler);
}
if (abt_handler == NULL) {
abt_handler = (void *) signal(SIGABRT, signal_handler);
}
#ifdef EXECUTION_TIMEOUT
bool timeout = false;
#ifdef _MSC_VER // windows
HANDLE hThread;
DWORD dwThreadId;
hThread = CreateThread(NULL, 0, Breakout, isolate, 0, &dwThreadId);
#else
pthread_t breakout_thread;
// set up the thread to break out the execution if needed
pthread_create(&breakout_thread, NULL, Breakout, isolate);
#endif
#endif
try {
MaybeLocal<v8::Value> result = fn->Call(ctx, receiver, nargs, args);
int status = SPI_finish();
#ifdef EXECUTION_TIMEOUT
#ifdef _MSC_VER
if (TerminateThread(hThread, NULL) == 0) {
timeout = true;
}
#else
void *thread_result;
pthread_cancel(breakout_thread);
pthread_join(breakout_thread, &thread_result);
if (thread_result == NULL) {
timeout = true;
}
#endif
#endif
// reset signal handlers
signal(SIGINT, (void (*)(int)) int_handler);
signal(SIGTERM, (void (*)(int)) term_handler);
signal(SIGABRT, (void (*)(int)) abt_handler);
HandleUnhandledPromiseRejections();
if (result.IsEmpty()) {
if (isolate->IsExecutionTerminating() || current_context->interrupted) {
isolate->CancelTerminateExecution();
if (current_context->interrupted) {
current_context->interrupted = false;
throw js_error("Signal caught: interrupted");
}
#ifdef EXECUTION_TIMEOUT
if (timeout) {
throw js_error("execution timeout exceeded");
}
#endif
throw js_error("Out of memory error");
}
throw js_error(try_catch);
}
if (status < 0)
throw js_error(FormatSPIStatus(status));
return result.ToLocalChecked();
} catch (int err) {
elog(NOTICE, "Error caught");
}
return Local<v8::Value>::New(isolate, Null(isolate));
}
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];
#if PG_VERSION_NUM >= 110000
bool nonatomic = fcinfo->context &&
IsA(fcinfo->context, CallContext) &&
!castNode(CallContext, fcinfo->context)->atomic;
#else
bool nonatomic = false;
#endif
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++) {
#if PG_VERSION_NUM < 120000
args[i] = ToValue(fcinfo->arg[i], fcinfo->argnull[i], &argtypes[i]);
#else
args[i] = ToValue(fcinfo->args[i].value, fcinfo->args[i].isnull, &argtypes[i]);
#endif
}
}
Local<Object> recv = Local<Object>::New(xenv->isolate, xenv->recv);
Local<Function> fn =
Local<Function>::Cast(recv->GetInternalField(0));
Local<v8::Value> result =
DoCall(context, fn, recv, nargs, args, nonatomic);
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;
}