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lib,src: "throw" on unhandled promise rejections #6375

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lib,src: "throw" on unhandled promise rejections #6375

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8a2e21a
lib,src: throw on unhanded promise rejections
Fishrock123 Apr 25, 2016
c083f6a
src: use std::map for the promise reject map
Fishrock123 Feb 10, 2017
a6a36a5
wip move to unordered_map
Fishrock123 Feb 21, 2017
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src: use std::map for the promise reject map
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@Fishrock123
Fishrock123 committed Feb 10, 2017
commit c083f6a6a910657a59afaa9389caa25d26772fbc
10 changes: 9 additions & 1 deletion src/env.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@

#include <stdint.h>
#include <vector>
#include <map>

// Caveat emptor: we're going slightly crazy with macros here but the end
// hopefully justifies the means. We have a lot of per-context properties
Expand Down Expand Up @@ -253,7 +254,6 @@ namespace node {
V(process_object, v8::Object) \
V(promise_unhandled_rejection_function, v8::Function) \
V(promise_unhandled_rejection, v8::Function) \
V(promise_unhandled_reject_map, v8::NativeWeakMap) \
V(promise_unhandled_reject_keys, v8::Set) \
V(push_values_to_array_function, v8::Function) \
V(script_context_constructor_template, v8::FunctionTemplate) \
Expand Down Expand Up @@ -555,6 +555,14 @@ class Environment {

static const int kContextEmbedderDataIndex = NODE_CONTEXT_EMBEDDER_DATA_INDEX;

struct v8LocalCompare {
bool operator() (const v8::Local<v8::Value>& lhs, const v8::Local<v8::Value>& rhs) const {
return !lhs->StrictEquals(rhs);
}
};

std::map<v8::Local<v8::Value>, v8::Local<v8::Object>, v8LocalCompare> promise_unhandled_reject_map;

private:
inline void ThrowError(v8::Local<v8::Value> (*fun)(v8::Local<v8::String>),
const char* errmsg);
Expand Down
29 changes: 15 additions & 14 deletions src/node.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@

#include <string>
#include <vector>
#include <map>

#if defined(NODE_HAVE_I18N_SUPPORT)
#include <unicode/uvernum.h>
Expand Down Expand Up @@ -1206,21 +1207,19 @@ void TrackPromise(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsObject());
Local<Object> promise = args[0].As<Object>();

TrackPromise::New(env->isolate(), promise);

Local<Value> promise_value = GetPromiseReason(env, promise);
Local<NativeWeakMap> unhandled_reject_map =
env->promise_unhandled_reject_map();
std::map<Local<Value>, Local<Object>, Environment::v8LocalCompare> unhandled_reject_map =
env->promise_unhandled_reject_map;
Local<Set> unhandled_reject_keys =
env->promise_unhandled_reject_keys();

if (unhandled_reject_keys->Size() > 1000) {
return;
}

if (!unhandled_reject_map->Has(promise_value) &&
if (unhandled_reject_map.find(promise_value) != unhandled_reject_map.end() &&
!promise_value->IsUndefined()) {
unhandled_reject_map->Set(promise_value, promise);
unhandled_reject_map.insert(std::make_pair(promise_value, promise));
CHECK(!unhandled_reject_keys->Add(env->context(), promise_value).IsEmpty());
}
}
Expand All @@ -1232,22 +1231,23 @@ void UntrackPromise(const FunctionCallbackInfo<Value>& args) {
Local<Value> promise = args[0].As<Value>();

Local<Value> err = GetPromiseReason(env, promise);
Local<NativeWeakMap> unhandled_reject_map =
env->promise_unhandled_reject_map();
std::map<Local<Value>, Local<Object>, Environment::v8LocalCompare> unhandled_reject_map =
env->promise_unhandled_reject_map;
Local<Set> unhandled_reject_keys =
env->promise_unhandled_reject_keys();

if (unhandled_reject_keys->Has(env->context(), err).IsJust()) {
CHECK(unhandled_reject_keys->Delete(env->context(), err).IsJust());
unhandled_reject_map->Delete(err);
unhandled_reject_map.erase(err);
}
}

void SetupPromises(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();

env->set_promise_unhandled_reject_map(NativeWeakMap::New(isolate));
std::map<Local<Value>, Local<Object>, Environment::v8LocalCompare> promise_reject_map;
env->promise_unhandled_reject_map = promise_reject_map;
env->set_promise_unhandled_reject_keys(Set::New(isolate));

CHECK(args[0]->IsFunction());
Expand Down Expand Up @@ -4554,15 +4554,16 @@ inline int Start(Isolate* isolate, IsolateData* isolate_data,
Null(env.isolate()), 1, &promise_keys_set).ToLocalChecked();
Local<Array> promise_keys = ret.As<Array>();
uint32_t key_count = promise_keys->Length();
Local<NativeWeakMap> unhandled_reject_map =
env.promise_unhandled_reject_map();
std::map<Local<Value>, Local<Object>, Environment::v8LocalCompare> unhandled_reject_map =
env.promise_unhandled_reject_map;

for (uint32_t key_iter = 0; key_iter < key_count; key_iter++) {
Local<Value> key = promise_keys->Get(env.context(),
key_iter).ToLocalChecked();

if (unhandled_reject_map->Has(key)) {
Local<Value> promise = unhandled_reject_map->Get(key);
if (unhandled_reject_map.find(key) != unhandled_reject_map.end()) {
Local<Value> promise =
unhandled_reject_map.find(key)->second;
Local<Value> err = GetPromiseReason(&env, promise);
Local<Message> message = Exception::CreateMessage(isolate, err);

Expand Down