node.js binding fixes

node-binding/addon.cc

@@ -24,7 +24,7 @@ NAN_MODULE_INIT(InitAddon)
 
     tpl = Nan::New<v8::FunctionTemplate>(NodeVitastorImage::Create);
     tpl->SetClassName(Nan::New("Image").ToLocalChecked());
-    tpl->InstanceTemplate()->SetInternalFieldCount(2);
+    tpl->InstanceTemplate()->SetInternalFieldCount(1);
 
     Nan::SetPrototypeMethod(tpl, "read", NodeVitastorImage::Read);
     Nan::SetPrototypeMethod(tpl, "write", NodeVitastorImage::Write);
@@ -67,7 +67,7 @@ NAN_MODULE_INIT(InitAddon)
 
     tpl = Nan::New<v8::FunctionTemplate>(NodeVitastorKVListing::Create);
     tpl->SetClassName(Nan::New("KVListing").ToLocalChecked());
-    tpl->InstanceTemplate()->SetInternalFieldCount(2);
+    tpl->InstanceTemplate()->SetInternalFieldCount(1);
 
     Nan::SetPrototypeMethod(tpl, "next", NodeVitastorKVListing::Next);
     Nan::SetPrototypeMethod(tpl, "close", NodeVitastorKVListing::Close);

node-binding/binding.gyp

@@ -10,10 +10,11 @@
         '<!(node -e "require(\'nan\')")'
       ],
       'cflags': [
-        '<!(pkg-config --cflags vitastor)'
+        '<!(pkg-config --cflags vitastor) -g'
       ],
       'libraries': [
-        '<!(pkg-config --libs vitastor)'
+        '<!(pkg-config --libs vitastor)',
+        '-lvitastor_kv'
       ]
     }
   ]

node-binding/client.cc

@@ -18,13 +18,15 @@
 class NodeVitastorRequest: public Nan::AsyncResource
 {
 public:
-    NodeVitastorRequest(v8::Local<v8::Function> cb): Nan::AsyncResource("NodeVitastorRequest")
+    NodeVitastorRequest(NodeVitastor *cli, v8::Local<v8::Function> cb): Nan::AsyncResource("NodeVitastorRequest")
     {
+        this->cli = cli;
         callback.Reset(cb);
     }
 
     iovec iov;
     std::vector<iovec> iov_list;
+    NodeVitastor *cli = NULL;
     NodeVitastorImage *img = NULL;
     int op = 0;
     uint64_t offset = 0, len = 0, version = 0;
@@ -44,6 +46,7 @@ NodeVitastor::NodeVitastor(): Nan::ObjectWrap()
 
 NodeVitastor::~NodeVitastor()
 {
+    TRACE("NodeVitastor: destructor");
     uv_poll_stop(&poll_watcher);
     vitastor_c_destroy(c);
     c = NULL;
@@ -75,9 +78,10 @@ NAN_METHOD(NodeVitastor::Create)
     if (res >= 0)
     {
         cli->eventfd = res;
-        res = uv_poll_init_socket(uv_default_loop(), &cli->poll_watcher, cli->eventfd);
+        res = uv_poll_init(uv_default_loop(), &cli->poll_watcher, cli->eventfd);
         if (res >= 0)
             res = uv_poll_start(&cli->poll_watcher, UV_READABLE, on_io_readable);
+        on_io_readable(&cli->poll_watcher, 0, UV_READABLE);
     }
     if (res < 0)
     {
@@ -98,12 +102,28 @@ void NodeVitastor::on_io_readable(uv_poll_t* handle, int status, int revents)
     if (revents & UV_READABLE)
     {
         NodeVitastor* self = (NodeVitastor*)handle->data;
-        std::unique_lock<std::mutex> lock(self->mu);
-        vitastor_c_uring_handle_events(self->c);
+        {
+            std::unique_lock<std::mutex> lock(self->mu);
+            vitastor_c_uring_handle_events(self->c);
+        }
+        self->run_postponed();
     }
 }
 
-static NodeVitastorRequest* getReadRequest(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
+void NodeVitastor::run_postponed()
+{
+    std::vector<std::function<void()>> callbacks;
+    {
+        std::unique_lock<std::mutex> lock(mu);
+        callbacks.swap(postponed);
+    }
+    for (auto & cb: callbacks)
+    {
+        cb();
+    }
+}
+
+NodeVitastorRequest* NodeVitastor::get_read_request(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
 {
     uint64_t offset = Nan::To<int64_t>(info[argpos+0]).FromJust();
     uint64_t len = Nan::To<int64_t>(info[argpos+1]).FromJust();
@@ -114,7 +134,7 @@ static NodeVitastorRequest* getReadRequest(const Nan::FunctionCallbackInfo<v8::V
         return NULL;
     }
     v8::Local<v8::Function> callback = info[argpos+2].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(this, callback);
 
     req->offset = offset;
     req->len = len;
@@ -133,13 +153,17 @@ NAN_METHOD(NodeVitastor::Read)
     uint64_t pool = Nan::To<int64_t>(info[0]).FromJust();
     uint64_t inode = Nan::To<int64_t>(info[1]).FromJust();
 
-    auto req = getReadRequest(info, 2);
+    auto req = self->get_read_request(info, 2);
 
-    std::unique_lock<std::mutex> lock(self->mu);
-    vitastor_c_read(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, &req->iov, 1, on_read_finish, req);
+    self->Ref();
+    {
+        std::unique_lock<std::mutex> lock(self->mu);
+        vitastor_c_read(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, &req->iov, 1, postpone_read_finish, req);
+    }
+    self->run_postponed();
 }
 
-static NodeVitastorRequest* getWriteRequest(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
+NodeVitastorRequest* NodeVitastor::get_write_request(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos)
 {
     uint64_t offset = Nan::To<int64_t>(info[argpos+0]).FromJust();
     const auto & bufarg = info[argpos+1];
@@ -155,7 +179,7 @@ static NodeVitastorRequest* getWriteRequest(const Nan::FunctionCallbackInfo<v8::
     }
 
     v8::Local<v8::Function> callback = info[argpos+2].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(this, callback);
 
     req->offset = offset;
     req->version = version;
@@ -177,7 +201,7 @@ static NodeVitastorRequest* getWriteRequest(const Nan::FunctionCallbackInfo<v8::
     {
         char *buf = node::Buffer::Data(bufarg);
         uint64_t len = node::Buffer::Length(bufarg);
-        req->iov = { .iov_base = buf, .iov_len = req->len };
+        req->iov = { .iov_base = buf, .iov_len = len };
         req->len = len;
     }
 
@@ -194,13 +218,17 @@ NAN_METHOD(NodeVitastor::Write)
     uint64_t pool = Nan::To<int64_t>(info[0]).FromJust();
     uint64_t inode = Nan::To<int64_t>(info[1]).FromJust();
 
-    auto req = getWriteRequest(info, 2);
+    auto req = self->get_write_request(info, 2);
 
-    std::unique_lock<std::mutex> lock(self->mu);
-    vitastor_c_write(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, req->version,
-        req->iov_list.size() ? req->iov_list.data() : &req->iov,
-        req->iov_list.size() ? req->iov_list.size() : 1,
-        on_write_finish, req);
+    self->Ref();
+    {
+        std::unique_lock<std::mutex> lock(self->mu);
+        vitastor_c_write(self->c, ((pool << (64-POOL_ID_BITS)) | inode), req->offset, req->len, req->version,
+            req->iov_list.size() ? req->iov_list.data() : &req->iov,
+            req->iov_list.size() ? req->iov_list.size() : 1,
+            postpone_write_finish, req);
+    }
+    self->run_postponed();
 }
 
 // sync(callback(err))
@@ -211,10 +239,14 @@ NAN_METHOD(NodeVitastor::Sync)
     NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
 
     v8::Local<v8::Function> callback = info[0].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(self, callback);
 
-    std::unique_lock<std::mutex> lock(self->mu);
-    vitastor_c_sync(self->c, on_write_finish, req);
+    self->Ref();
+    {
+        std::unique_lock<std::mutex> lock(self->mu);
+        vitastor_c_sync(self->c, postpone_write_finish, req);
+    }
+    self->run_postponed();
 }
 
 // read_bitmap(pool, inode, offset, len, with_parents, callback(err, bitmap_buffer))
@@ -230,9 +262,14 @@ NAN_METHOD(NodeVitastor::ReadBitmap)
     uint64_t len = Nan::To<int64_t>(info[3]).FromJust();
     bool with_parents = Nan::To<bool>(info[4]).FromJust();
     v8::Local<v8::Function> callback = info[5].As<v8::Function>();
+    auto req = new NodeVitastorRequest(self, callback);
 
-    auto req = new NodeVitastorRequest(callback);
-    vitastor_c_read_bitmap(self->c, ((pool << (64-POOL_ID_BITS)) | inode), offset, len, with_parents, on_read_bitmap_finish, req);
+    self->Ref();
+    {
+        std::unique_lock<std::mutex> lock(self->mu);
+        vitastor_c_read_bitmap(self->c, ((pool << (64-POOL_ID_BITS)) | inode), offset, len, with_parents, postpone_read_bitmap_finish, req);
+    }
+    self->run_postponed();
 }
 
 static void on_error(NodeVitastorRequest *req, Nan::Callback & nanCallback, long retval)
@@ -248,6 +285,7 @@ static void on_error(NodeVitastorRequest *req, Nan::Callback & nanCallback, long
 
 void NodeVitastor::on_read_finish(void *opaque, long retval, uint64_t version)
 {
+    TRACE("NodeVitastor::on_read_finish");
     Nan::HandleScope scope;
     NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
     Nan::Callback nanCallback(Nan::New(req->callback));
@@ -269,20 +307,24 @@ void NodeVitastor::on_read_finish(void *opaque, long retval, uint64_t version)
         args[2] = v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), version);
         nanCallback.Call(3, args, req);
     }
+    req->cli->Unref();
     delete req;
 }
 
 void NodeVitastor::on_write_finish(void *opaque, long retval)
 {
+    TRACE("NodeVitastor::on_write_finish");
     Nan::HandleScope scope;
     NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
     Nan::Callback nanCallback(Nan::New(req->callback));
     on_error(req, nanCallback, retval);
+    req->cli->Unref();
     delete req;
 }
 
 void NodeVitastor::on_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap)
 {
+    TRACE("NodeVitastor::on_read_bitmap_finish");
     Nan::HandleScope scope;
     NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
     Nan::Callback nanCallback(Nan::New(req->callback));
@@ -297,9 +339,28 @@ void NodeVitastor::on_read_bitmap_finish(void *opaque, long retval, uint8_t *bit
         args[1] = Nan::NewBuffer((char*)bitmap, (retval+7)/8).ToLocalChecked();
         nanCallback.Call(2, args, req);
     }
+    req->cli->Unref();
     delete req;
 }
 
+void NodeVitastor::postpone_read_finish(void *opaque, long retval, uint64_t version)
+{
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    req->cli->postponed.push_back([=]() { on_read_finish(opaque, retval, version); });
+}
+
+void NodeVitastor::postpone_write_finish(void *opaque, long retval)
+{
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    req->cli->postponed.push_back([=]() { on_write_finish(opaque, retval); });
+}
+
+void NodeVitastor::postpone_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap)
+{
+    NodeVitastorRequest *req = (NodeVitastorRequest *)opaque;
+    req->cli->postponed.push_back([=]() { on_read_bitmap_finish(opaque, retval, bitmap); });
+}
+
 //NAN_METHOD(NodeVitastor::Destroy)
 //{
 //    TRACE("NodeVitastor::Destroy");
@@ -318,6 +379,8 @@ NAN_METHOD(NodeVitastorImage::Create)
     NodeVitastor *cli = Nan::ObjectWrap::Unwrap<NodeVitastor>(parent);
 
     NodeVitastorImage *img = new NodeVitastorImage();
+    img->Wrap(info.This());
+
     img->cli = cli;
     img->name = name;
 
@@ -326,7 +389,6 @@ NAN_METHOD(NodeVitastorImage::Create)
     std::unique_lock<std::mutex> lock(cli->mu);
     vitastor_c_watch_inode(cli->c, (char*)img->name.c_str(), on_watch_start, img);
 
-    img->Wrap(info.This());
     info.GetReturnValue().Set(info.This());
 }
 
@@ -347,7 +409,7 @@ NAN_METHOD(NodeVitastorImage::Read)
 
     NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
 
-    auto req = getReadRequest(info, 0);
+    auto req = img->cli->get_read_request(info, 0);
     req->img = img;
     req->op = NODE_VITASTOR_READ;
 
@@ -361,7 +423,7 @@ NAN_METHOD(NodeVitastorImage::Write)
 
     NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
 
-    auto req = getWriteRequest(info, 0);
+    auto req = img->cli->get_write_request(info, 0);
     req->img = img;
     req->op = NODE_VITASTOR_WRITE;
 
@@ -375,7 +437,7 @@ NAN_METHOD(NodeVitastorImage::Sync)
     NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
 
     v8::Local<v8::Function> callback = info[0].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(img->cli, callback);
     req->img = img;
     req->op = NODE_VITASTOR_SYNC;
 
@@ -394,7 +456,7 @@ NAN_METHOD(NodeVitastorImage::ReadBitmap)
     bool with_parents = Nan::To<bool>(info[2]).FromJust();
     v8::Local<v8::Function> callback = info[3].As<v8::Function>();
 
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(img->cli, callback);
     req->img = img;
     req->op = NODE_VITASTOR_READ_BITMAP;
     req->offset = offset;
@@ -406,12 +468,12 @@ NAN_METHOD(NodeVitastorImage::ReadBitmap)
 
 NAN_METHOD(NodeVitastorImage::GetInfo)
 {
-    TRACE("NodeVitastorImage::Sync");
+    TRACE("NodeVitastorImage::GetInfo");
 
     NodeVitastorImage* img = Nan::ObjectWrap::Unwrap<NodeVitastorImage>(info.This());
 
     v8::Local<v8::Function> callback = info[0].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(img->cli, callback);
     req->img = img;
     req->op = NODE_VITASTOR_GET_INFO;
 
@@ -433,78 +495,52 @@ void NodeVitastorImage::exec_or_wait(NodeVitastorRequest *req)
 
 void NodeVitastorImage::exec_request(NodeVitastorRequest *req)
 {
-    std::unique_lock<std::mutex> lock(cli->mu);
     if (req->op == NODE_VITASTOR_READ)
     {
+        cli->Ref();
+        std::unique_lock<std::mutex> lock(cli->mu);
         uint64_t ino = vitastor_c_inode_get_num(watch);
-        vitastor_c_read(cli->c, ino, req->offset, req->len, &req->iov, 1, NodeVitastor::on_read_finish, req);
+        vitastor_c_read(cli->c, ino, req->offset, req->len, &req->iov, 1, NodeVitastor::postpone_read_finish, req);
     }
     else if (req->op == NODE_VITASTOR_WRITE)
     {
+        cli->Ref();
+        std::unique_lock<std::mutex> lock(cli->mu);
         uint64_t ino = vitastor_c_inode_get_num(watch);
         vitastor_c_write(cli->c, ino, req->offset, req->len, req->version,
             req->iov_list.size() ? req->iov_list.data() : &req->iov,
             req->iov_list.size() ? req->iov_list.size() : 1,
-            NodeVitastor::on_write_finish, req);
+            NodeVitastor::postpone_write_finish, req);
     }
     else if (req->op == NODE_VITASTOR_SYNC)
     {
+        cli->Ref();
+        std::unique_lock<std::mutex> lock(cli->mu);
         uint64_t ino = vitastor_c_inode_get_num(watch);
         uint32_t imm = vitastor_c_inode_get_immediate_commit(cli->c, ino);
         if (imm != IMMEDIATE_ALL)
         {
-            vitastor_c_sync(cli->c, NodeVitastor::on_write_finish, req);
+            vitastor_c_sync(cli->c, NodeVitastor::postpone_write_finish, req);
         }
         else
         {
-            NodeVitastor::on_write_finish(req, 0);
+            NodeVitastor::postpone_write_finish(req, 0);
         }
     }
     else if (req->op == NODE_VITASTOR_READ_BITMAP)
     {
+        cli->Ref();
+        std::unique_lock<std::mutex> lock(cli->mu);
         uint64_t ino = vitastor_c_inode_get_num(watch);
-        vitastor_c_read_bitmap(cli->c, ino, req->offset, req->len, req->with_parents, NodeVitastor::on_read_bitmap_finish, req);
+        vitastor_c_read_bitmap(cli->c, ino, req->offset, req->len, req->with_parents, NodeVitastor::postpone_read_bitmap_finish, req);
     }
     else if (req->op == NODE_VITASTOR_GET_INFO)
     {
-        uint64_t size = vitastor_c_inode_get_size(watch);
-        uint64_t num = vitastor_c_inode_get_num(watch);
-        uint32_t block_size = vitastor_c_inode_get_block_size(cli->c, num);
-        uint32_t bitmap_granularity = vitastor_c_inode_get_bitmap_granularity(cli->c, num);
-        int readonly = vitastor_c_inode_get_readonly(watch);
-        uint32_t immediate_commit = vitastor_c_inode_get_immediate_commit(cli->c, num);
-        uint64_t parent_id = vitastor_c_inode_get_parent_id(watch);
-        char *meta = vitastor_c_inode_get_meta(watch);
-        uint64_t mod_revision = vitastor_c_inode_get_mod_revision(watch);
+        v8::Local<v8::Object> res = Nan::New<v8::Object>();
+
+        fill_info(res);
 
         Nan::HandleScope scope;
-
-        v8::Local<v8::Object> res = Nan::New<v8::Object>();
-        Nan::Set(res, Nan::New<v8::String>("pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(num)));
-        Nan::Set(res, Nan::New<v8::String>("inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(num)));
-        if (size < ((uint64_t)1<<53))
-            Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), Nan::New<v8::Number>(size));
-        else
-            Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), size));
-        if (parent_id)
-        {
-            Nan::Set(res, Nan::New<v8::String>("parent_pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(parent_id)));
-            Nan::Set(res, Nan::New<v8::String>("parent_inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(parent_id)));
-        }
-        Nan::Set(res, Nan::New<v8::String>("readonly").ToLocalChecked(), Nan::New((bool)readonly));
-        if (meta)
-        {
-            Nan::JSON nanJSON;
-            Nan::Set(res, Nan::New<v8::String>("meta").ToLocalChecked(), nanJSON.Parse(Nan::New<v8::String>(meta).ToLocalChecked()).ToLocalChecked());
-        }
-        if (mod_revision < ((uint64_t)1<<53))
-            Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), Nan::New<v8::Number>(mod_revision));
-        else
-            Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), mod_revision));
-        Nan::Set(res, Nan::New<v8::String>("block_size").ToLocalChecked(), Nan::New(block_size));
-        Nan::Set(res, Nan::New<v8::String>("bitmap_granularity").ToLocalChecked(), Nan::New(bitmap_granularity));
-        Nan::Set(res, Nan::New<v8::String>("immediate_commit").ToLocalChecked(), Nan::New(immediate_commit));
-
         Nan::Callback nanCallback(Nan::New(req->callback));
         v8::Local<v8::Value> args[1];
         args[0] = res;
@@ -512,6 +548,46 @@ void NodeVitastorImage::exec_request(NodeVitastorRequest *req)
 
         delete req;
     }
+    cli->run_postponed();
+}
+
+void NodeVitastorImage::fill_info(v8::Local<v8::Object> & res)
+{
+    std::unique_lock<std::mutex> lock(cli->mu);
+    uint64_t size = vitastor_c_inode_get_size(watch);
+    uint64_t num = vitastor_c_inode_get_num(watch);
+    uint32_t block_size = vitastor_c_inode_get_block_size(cli->c, num);
+    uint32_t bitmap_granularity = vitastor_c_inode_get_bitmap_granularity(cli->c, num);
+    int readonly = vitastor_c_inode_get_readonly(watch);
+    uint32_t immediate_commit = vitastor_c_inode_get_immediate_commit(cli->c, num);
+    uint64_t parent_id = vitastor_c_inode_get_parent_id(watch);
+    char *meta = vitastor_c_inode_get_meta(watch);
+    uint64_t mod_revision = vitastor_c_inode_get_mod_revision(watch);
+
+    Nan::Set(res, Nan::New<v8::String>("pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(num)));
+    Nan::Set(res, Nan::New<v8::String>("inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(num)));
+    if (size < ((uint64_t)1<<53))
+        Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), Nan::New<v8::Number>(size));
+    else
+        Nan::Set(res, Nan::New<v8::String>("size").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), size));
+    if (parent_id)
+    {
+        Nan::Set(res, Nan::New<v8::String>("parent_pool_id").ToLocalChecked(), Nan::New<v8::Number>(INODE_POOL(parent_id)));
+        Nan::Set(res, Nan::New<v8::String>("parent_inode_num").ToLocalChecked(), Nan::New<v8::Number>(INODE_NO_POOL(parent_id)));
+    }
+    Nan::Set(res, Nan::New<v8::String>("readonly").ToLocalChecked(), Nan::New((bool)readonly));
+    if (meta)
+    {
+        Nan::JSON nanJSON;
+        Nan::Set(res, Nan::New<v8::String>("meta").ToLocalChecked(), nanJSON.Parse(Nan::New<v8::String>(meta).ToLocalChecked()).ToLocalChecked());
+    }
+    if (mod_revision < ((uint64_t)1<<53))
+        Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), Nan::New<v8::Number>(mod_revision));
+    else
+        Nan::Set(res, Nan::New<v8::String>("mod_revision").ToLocalChecked(), v8::BigInt::NewFromUnsigned(v8::Isolate::GetCurrent(), mod_revision));
+    Nan::Set(res, Nan::New<v8::String>("block_size").ToLocalChecked(), Nan::New(block_size));
+    Nan::Set(res, Nan::New<v8::String>("bitmap_granularity").ToLocalChecked(), Nan::New(bitmap_granularity));
+    Nan::Set(res, Nan::New<v8::String>("immediate_commit").ToLocalChecked(), Nan::New(immediate_commit));
 }
 
 void NodeVitastorImage::on_watch_start(void *opaque, long retval)
@@ -532,6 +608,8 @@ void NodeVitastorImage::on_watch_start(void *opaque, long retval)
 // NodeVitastorKV
 //////////////////////////////////////////////////
 
+Nan::Persistent<v8::Function> NodeVitastorKV::listing_class;
+
 // constructor(node_vitastor)
 NAN_METHOD(NodeVitastorKV::Create)
 {
@@ -548,24 +626,26 @@ NAN_METHOD(NodeVitastorKV::Create)
     }
 
     kv->Wrap(info.This());
+    cli->Ref();
     info.GetReturnValue().Set(info.This());
 }
 
 NodeVitastorKV::~NodeVitastorKV()
 {
     delete dbw;
+    cli->Unref();
 }
 
-// open(inode_id, { ...config }, callback(err))
+// open(pool_id, inode_num, { ...config }, callback(err))
 NAN_METHOD(NodeVitastorKV::Open)
 {
     TRACE("NodeVitastorKV::Open");
 
     NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
 
-    uint64_t inode_id = Nan::To<int64_t>(info[0]).FromJust();
+    uint64_t inode_id = INODE_WITH_POOL(Nan::To<int64_t>(info[0]).FromJust(), Nan::To<int64_t>(info[1]).FromJust());
 
-    v8::Local<v8::Object> jsParams = info[1].As<v8::Object>();
+    v8::Local<v8::Object> jsParams = info[2].As<v8::Object>();
     v8::Local<v8::Array> keys = Nan::GetOwnPropertyNames(jsParams).ToLocalChecked();
     std::map<std::string, std::string> cfg;
     for (uint32_t i = 0; i < keys->Length(); i++)
@@ -574,8 +654,8 @@ NAN_METHOD(NodeVitastorKV::Open)
         cfg[std::string(*Nan::Utf8String(key))] = std::string(*Nan::Utf8String(Nan::Get(jsParams, key).ToLocalChecked()));
     }
 
-    v8::Local<v8::Function> callback = info[2].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    v8::Local<v8::Function> callback = info[3].As<v8::Function>();
+    auto req = new NodeVitastorRequest(kv->cli, callback);
 
     kv->Ref();
     kv->dbw->open(inode_id, cfg, [kv, req](int res)
@@ -598,7 +678,7 @@ NAN_METHOD(NodeVitastorKV::Close)
     NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
 
     v8::Local<v8::Function> callback = info[0].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(kv->cli, callback);
 
     kv->Ref();
     kv->dbw->close([kv, req]()
@@ -651,7 +731,7 @@ void NodeVitastorKV::get_impl(const Nan::FunctionCallbackInfo<v8::Value> & info,
     std::string key(*Nan::Utf8String(info[0].As<v8::String>()));
 
     v8::Local<v8::Function> callback = info[1].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(kv->cli, callback);
 
     kv->Ref();
     kv->dbw->get(key, [kv, req](int res, const std::string & value)
@@ -708,13 +788,13 @@ NAN_METHOD(NodeVitastorKV::Set)
     std::string value(*Nan::Utf8String(info[1].As<v8::String>()));
 
     v8::Local<v8::Function> callback = info[2].As<v8::Function>();
-    NodeVitastorRequest *req = new NodeVitastorRequest(callback), *cas_req = NULL;
+    NodeVitastorRequest *req = new NodeVitastorRequest(kv->cli, callback), *cas_req = NULL;
 
     std::function<bool(int, const std::string &)> cas_cb;
     if (info.Length() > 3 && info[3]->IsObject())
     {
         v8::Local<v8::Function> cas_callback = info[3].As<v8::Function>();
-        cas_req = new NodeVitastorRequest(cas_callback);
+        cas_req = new NodeVitastorRequest(kv->cli, cas_callback);
         cas_cb = make_cas_callback(cas_req);
     }
 
@@ -744,13 +824,13 @@ NAN_METHOD(NodeVitastorKV::Del)
     std::string key(*Nan::Utf8String(info[0].As<v8::String>()));
 
     v8::Local<v8::Function> callback = info[1].As<v8::Function>();
-    NodeVitastorRequest *req = new NodeVitastorRequest(callback), *cas_req = NULL;
+    NodeVitastorRequest *req = new NodeVitastorRequest(kv->cli, callback), *cas_req = NULL;
 
     std::function<bool(int, const std::string &)> cas_cb;
     if (info.Length() > 2 && info[2]->IsObject())
     {
         v8::Local<v8::Function> cas_callback = info[2].As<v8::Function>();
-        cas_req = new NodeVitastorRequest(cas_callback);
+        cas_req = new NodeVitastorRequest(kv->cli, cas_callback);
         cas_cb = make_cas_callback(cas_req);
     }
 
@@ -786,6 +866,15 @@ NAN_METHOD(NodeVitastorKV::List)
     info.GetReturnValue().Set(Nan::NewInstance(cons, narg, args).ToLocalChecked());
 }
 
+/*NAN_METHOD(NodeVitastorKV::Destroy)
+{
+    TRACE("NodeVitastorKV::Destroy");
+    NodeVitastorKV* kv = Nan::ObjectWrap::Unwrap<NodeVitastorKV>(info.This());
+    std::unique_lock<std::mutex> lock(self->mu);
+    if (!kv->dead)
+        kv->Unref();
+}*/
+
 //////////////////////////////////////////////////
 // NodeVitastorKVListing
 //////////////////////////////////////////////////
@@ -813,6 +902,7 @@ NAN_METHOD(NodeVitastorKVListing::Create)
     }
 
     list->Wrap(info.This());
+    kv->Ref();
     info.GetReturnValue().Set(info.This());
 }
 
@@ -824,6 +914,7 @@ NodeVitastorKVListing::~NodeVitastorKVListing()
         kv->dbw->list_close(handle);
         handle = NULL;
     }
+    kv->Unref();
 }
 
 // next(callback(err, value))
@@ -834,7 +925,7 @@ NAN_METHOD(NodeVitastorKVListing::Next)
     NodeVitastorKVListing* list = Nan::ObjectWrap::Unwrap<NodeVitastorKVListing>(info.This());
 
     v8::Local<v8::Function> callback = info[0].As<v8::Function>();
-    auto req = new NodeVitastorRequest(callback);
+    auto req = new NodeVitastorRequest(list->kv->cli, callback);
     if (!list->handle)
     {
         // Already closed

node-binding/client.h

@@ -36,6 +36,7 @@ private:
     uv_poll_t poll_watcher;
     // FIXME: Is it really needed?
     std::mutex mu;
+    std::vector<std::function<void()>> postponed;
 
     NodeVitastor();
 
@@ -44,6 +45,14 @@ private:
     static void on_write_finish(void *opaque, long retval);
     static void on_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap);
 
+    void run_postponed();
+    static void postpone_read_finish(void *opaque, long retval, uint64_t version);
+    static void postpone_write_finish(void *opaque, long retval);
+    static void postpone_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap);
+
+    NodeVitastorRequest* get_read_request(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos);
+    NodeVitastorRequest* get_write_request(const Nan::FunctionCallbackInfo<v8::Value> & info, int argpos);
+
     friend class NodeVitastorImage;
     friend class NodeVitastorKV;
     friend class NodeVitastorKVListing;
@@ -74,11 +83,10 @@ private:
     std::vector<NodeVitastorRequest*> on_init;
     Nan::Persistent<v8::Object> cliObj;
 
-    NodeVitastorImage();
-
     static void on_watch_start(void *opaque, long retval);
     void exec_request(NodeVitastorRequest *req);
     void exec_or_wait(NodeVitastorRequest *req);
+    void fill_info(v8::Local<v8::Object> & res);
 };
 
 class NodeVitastorKV: public Nan::ObjectWrap
@@ -86,7 +94,7 @@ class NodeVitastorKV: public Nan::ObjectWrap
 public:
     // constructor(node_vitastor)
     static NAN_METHOD(Create);
-    // open(inode_id, { ...config }, callback(err))
+    // open(pool_id, inode_num, { ...config }, callback(err))
     static NAN_METHOD(Open);
     // set_config({ ...config })
     static NAN_METHOD(SetConfig);
@@ -113,8 +121,6 @@ private:
     NodeVitastor *cli = NULL;
     vitastorkv_dbw_t *dbw = NULL;
 
-    NodeVitastorKV();
-
     static void get_impl(const Nan::FunctionCallbackInfo<v8::Value> & info, bool allow_cache);
 
     friend class NodeVitastorKVListing;
@@ -135,8 +141,6 @@ public:
 private:
     NodeVitastorKV *kv = NULL;
     void *handle = NULL;
-
-    NodeVitastorKVListing();
 };
 
 #endif

node-binding/index.js

@@ -0,0 +1 @@
+module.exports = require('bindings')('addon.node');