src/node/ext/channel.cc - third_party/grpc - Git at Google

 /*
  *
  * Copyright 2015 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  */

 #include <vector>

 #include "grpc/support/log.h"

 #include <nan.h>
 #include <node.h>
 #include "call.h"
 #include "channel.h"
 #include "channel_credentials.h"
 #include "completion_queue.h"
 #include "grpc/grpc.h"
 #include "grpc/grpc_security.h"
 #include "timeval.h"

 namespace grpc {
 namespace node {

 using Nan::Callback;
 using Nan::EscapableHandleScope;
 using Nan::HandleScope;
 using Nan::Maybe;
 using Nan::MaybeLocal;
 using Nan::ObjectWrap;
 using Nan::Persistent;
 using Nan::Utf8String;

 using v8::Array;
 using v8::Exception;
 using v8::Function;
 using v8::FunctionTemplate;
 using v8::Integer;
 using v8::Local;
 using v8::Number;
 using v8::Object;
 using v8::String;
 using v8::Value;

 Callback *Channel::constructor;
 Persistent<FunctionTemplate> Channel::fun_tpl;

 bool ParseChannelArgs(Local<Value> args_val,
                       grpc_channel_args **channel_args_ptr) {
   if (args_val->IsUndefined() || args_val->IsNull()) {
     *channel_args_ptr = NULL;
     return true;
   }
   if (!args_val->IsObject()) {
     *channel_args_ptr = NULL;
     return false;
   }
   grpc_channel_args *channel_args =
       reinterpret_cast<grpc_channel_args *>(malloc(sizeof(grpc_channel_args)));
   *channel_args_ptr = channel_args;
   Local<Object> args_hash = Nan::To<Object>(args_val).ToLocalChecked();
   Local<Array> keys = Nan::GetOwnPropertyNames(args_hash).ToLocalChecked();
   channel_args->num_args = keys->Length();
   channel_args->args = reinterpret_cast<grpc_arg *>(
       calloc(channel_args->num_args, sizeof(grpc_arg)));
   for (unsigned int i = 0; i < channel_args->num_args; i++) {
     Local<Value> key = Nan::Get(keys, i).ToLocalChecked();
     Utf8String key_str(key);
     if (*key_str == NULL) {
       // Key string onversion failed
       return false;
     }
     Local<Value> value = Nan::Get(args_hash, key).ToLocalChecked();
     if (value->IsInt32()) {
       channel_args->args[i].type = GRPC_ARG_INTEGER;
       channel_args->args[i].value.integer = Nan::To<int32_t>(value).FromJust();
     } else if (value->IsString()) {
       Utf8String val_str(value);
       channel_args->args[i].type = GRPC_ARG_STRING;
       channel_args->args[i].value.string =
           reinterpret_cast<char *>(calloc(val_str.length() + 1, sizeof(char)));
       memcpy(channel_args->args[i].value.string, *val_str,
              val_str.length() + 1);
     } else {
       // The value does not match either of the accepted types
       return false;
     }
     channel_args->args[i].key =
         reinterpret_cast<char *>(calloc(key_str.length() + 1, sizeof(char)));
     memcpy(channel_args->args[i].key, *key_str, key_str.length() + 1);
   }
   return true;
 }

 void DeallocateChannelArgs(grpc_channel_args *channel_args) {
   if (channel_args == NULL) {
     return;
   }
   for (size_t i = 0; i < channel_args->num_args; i++) {
     if (channel_args->args[i].key == NULL) {
       /* NULL key implies that this argument and all subsequent arguments failed
        * to parse */
       break;
     }
     free(channel_args->args[i].key);
     if (channel_args->args[i].type == GRPC_ARG_STRING) {
       free(channel_args->args[i].value.string);
     }
   }
   free(channel_args->args);
   free(channel_args);
 }

 Channel::Channel(grpc_channel *channel) : wrapped_channel(channel) {}

 Channel::~Channel() {
   gpr_log(GPR_DEBUG, "Destroying channel");
   if (wrapped_channel != NULL) {
     grpc_channel_destroy(wrapped_channel);
   }
 }

 void Channel::Init(Local<Object> exports) {
   Nan::HandleScope scope;
   Local<FunctionTemplate> tpl = Nan::New<FunctionTemplate>(New);
   tpl->SetClassName(Nan::New("Channel").ToLocalChecked());
   tpl->InstanceTemplate()->SetInternalFieldCount(1);
   Nan::SetPrototypeMethod(tpl, "close", Close);
   Nan::SetPrototypeMethod(tpl, "getTarget", GetTarget);
   Nan::SetPrototypeMethod(tpl, "getConnectivityState", GetConnectivityState);
   Nan::SetPrototypeMethod(tpl, "watchConnectivityState",
                           WatchConnectivityState);
   fun_tpl.Reset(tpl);
   Local<Function> ctr = Nan::GetFunction(tpl).ToLocalChecked();
   Nan::Set(exports, Nan::New("Channel").ToLocalChecked(), ctr);
   constructor = new Callback(ctr);
 }

 bool Channel::HasInstance(Local<Value> val) {
   HandleScope scope;
   return Nan::New(fun_tpl)->HasInstance(val);
 }

 grpc_channel *Channel::GetWrappedChannel() { return this->wrapped_channel; }

 NAN_METHOD(Channel::New) {
   if (info.IsConstructCall()) {
     if (!info[0]->IsString()) {
       return Nan::ThrowTypeError(
           "Channel expects a string, a credential and an object");
     }
     grpc_channel *wrapped_channel;
     // Owned by the Channel object
     Utf8String host(info[0]);
     grpc_channel_credentials *creds;
     if (!ChannelCredentials::HasInstance(info[1])) {
       return Nan::ThrowTypeError(
           "Channel's second argument must be a ChannelCredentials");
     }
     ChannelCredentials *creds_object = ObjectWrap::Unwrap<ChannelCredentials>(
         Nan::To<Object>(info[1]).ToLocalChecked());
     creds = creds_object->GetWrappedCredentials();
     grpc_channel_args *channel_args_ptr = NULL;
     if (!ParseChannelArgs(info[2], &channel_args_ptr)) {
       DeallocateChannelArgs(channel_args_ptr);
       return Nan::ThrowTypeError(
           "Channel options must be an object with "
           "string keys and integer or string values");
     }
     if (creds == NULL) {
       wrapped_channel =
           grpc_insecure_channel_create(*host, channel_args_ptr, NULL);
     } else {
       wrapped_channel =
           grpc_secure_channel_create(creds, *host, channel_args_ptr, NULL);
     }
     DeallocateChannelArgs(channel_args_ptr);
     Channel *channel = new Channel(wrapped_channel);
     channel->Wrap(info.This());
     info.GetReturnValue().Set(info.This());
     return;
   } else {
     const int argc = 3;
     Local<Value> argv[argc] = {info[0], info[1], info[2]};
     MaybeLocal<Object> maybe_instance =
         Nan::NewInstance(constructor->GetFunction(), argc, argv);
     if (maybe_instance.IsEmpty()) {
       // There's probably a pending exception
       return;
     } else {
       info.GetReturnValue().Set(maybe_instance.ToLocalChecked());
     }
   }
 }

 NAN_METHOD(Channel::Close) {
   if (!HasInstance(info.This())) {
     return Nan::ThrowTypeError("close can only be called on Channel objects");
   }
   Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
   if (channel->wrapped_channel != NULL) {
     grpc_channel_destroy(channel->wrapped_channel);
     channel->wrapped_channel = NULL;
   }
 }

 NAN_METHOD(Channel::GetTarget) {
   if (!HasInstance(info.This())) {
     return Nan::ThrowTypeError(
         "getTarget can only be called on Channel objects");
   }
   Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
   info.GetReturnValue().Set(
       Nan::New(grpc_channel_get_target(channel->wrapped_channel))
           .ToLocalChecked());
 }

 NAN_METHOD(Channel::GetConnectivityState) {
   if (!HasInstance(info.This())) {
     return Nan::ThrowTypeError(
         "getConnectivityState can only be called on Channel objects");
   }
   Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
   int try_to_connect = (int)info[0]->Equals(Nan::True());
   info.GetReturnValue().Set(grpc_channel_check_connectivity_state(
       channel->wrapped_channel, try_to_connect));
 }

 NAN_METHOD(Channel::WatchConnectivityState) {
   if (!HasInstance(info.This())) {
     return Nan::ThrowTypeError(
         "watchConnectivityState can only be called on Channel objects");
   }
   if (!info[0]->IsUint32()) {
     return Nan::ThrowTypeError(
         "watchConnectivityState's first argument must be a channel state");
   }
   if (!(info[1]->IsNumber() || info[1]->IsDate())) {
     return Nan::ThrowTypeError(
         "watchConnectivityState's second argument must be a date or a number");
   }
   if (!info[2]->IsFunction()) {
     return Nan::ThrowTypeError(
         "watchConnectivityState's third argument must be a callback");
   }
   grpc_connectivity_state last_state = static_cast<grpc_connectivity_state>(
       Nan::To<uint32_t>(info[0]).FromJust());
   double deadline = Nan::To<double>(info[1]).FromJust();
   Local<Function> callback_func = info[2].As<Function>();
   Nan::Callback *callback = new Callback(callback_func);
   Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
   unique_ptr<OpVec> ops(new OpVec());
   grpc_channel_watch_connectivity_state(
       channel->wrapped_channel, last_state, MillisecondsToTimespec(deadline),
       GetCompletionQueue(),
       new struct tag(callback, ops.release(), NULL, Nan::Null()));
   CompletionQueueNext();
 }

 }  // namespace node
 }  // namespace grpc
	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/

	#include <vector>

	#include "grpc/support/log.h"

	#include <nan.h>
	#include <node.h>
	#include "call.h"
	#include "channel.h"
	#include "channel_credentials.h"
	#include "completion_queue.h"
	#include "grpc/grpc.h"
	#include "grpc/grpc_security.h"
	#include "timeval.h"

	namespace grpc {
	namespace node {

	using Nan::Callback;
	using Nan::EscapableHandleScope;
	using Nan::HandleScope;
	using Nan::Maybe;
	using Nan::MaybeLocal;
	using Nan::ObjectWrap;
	using Nan::Persistent;
	using Nan::Utf8String;

	using v8::Array;
	using v8::Exception;
	using v8::Function;
	using v8::FunctionTemplate;
	using v8::Integer;
	using v8::Local;
	using v8::Number;
	using v8::Object;
	using v8::String;
	using v8::Value;

	Callback *Channel::constructor;
	Persistent<FunctionTemplate> Channel::fun_tpl;

	bool ParseChannelArgs(Local<Value> args_val,
	grpc_channel_args **channel_args_ptr) {
	if (args_val->IsUndefined() \|\| args_val->IsNull()) {
	*channel_args_ptr = NULL;
	return true;
	}
	if (!args_val->IsObject()) {
	*channel_args_ptr = NULL;
	return false;
	}
	grpc_channel_args *channel_args =
	reinterpret_cast<grpc_channel_args *>(malloc(sizeof(grpc_channel_args)));
	*channel_args_ptr = channel_args;
	Local<Object> args_hash = Nan::To<Object>(args_val).ToLocalChecked();
	Local<Array> keys = Nan::GetOwnPropertyNames(args_hash).ToLocalChecked();
	channel_args->num_args = keys->Length();
	channel_args->args = reinterpret_cast<grpc_arg *>(
	calloc(channel_args->num_args, sizeof(grpc_arg)));
	for (unsigned int i = 0; i < channel_args->num_args; i++) {
	Local<Value> key = Nan::Get(keys, i).ToLocalChecked();
	Utf8String key_str(key);
	if (*key_str == NULL) {
	// Key string onversion failed
	return false;
	}
	Local<Value> value = Nan::Get(args_hash, key).ToLocalChecked();
	if (value->IsInt32()) {
	channel_args->args[i].type = GRPC_ARG_INTEGER;
	channel_args->args[i].value.integer = Nan::To<int32_t>(value).FromJust();
	} else if (value->IsString()) {
	Utf8String val_str(value);
	channel_args->args[i].type = GRPC_ARG_STRING;
	channel_args->args[i].value.string =
	reinterpret_cast<char *>(calloc(val_str.length() + 1, sizeof(char)));
	memcpy(channel_args->args[i].value.string, *val_str,
	val_str.length() + 1);
	} else {
	// The value does not match either of the accepted types
	return false;
	}
	channel_args->args[i].key =
	reinterpret_cast<char *>(calloc(key_str.length() + 1, sizeof(char)));
	memcpy(channel_args->args[i].key, *key_str, key_str.length() + 1);
	}
	return true;
	}

	void DeallocateChannelArgs(grpc_channel_args *channel_args) {
	if (channel_args == NULL) {
	return;
	}
	for (size_t i = 0; i < channel_args->num_args; i++) {
	if (channel_args->args[i].key == NULL) {
	/* NULL key implies that this argument and all subsequent arguments failed
	* to parse */
	break;
	}
	free(channel_args->args[i].key);
	if (channel_args->args[i].type == GRPC_ARG_STRING) {
	free(channel_args->args[i].value.string);
	}
	}
	free(channel_args->args);
	free(channel_args);
	}

	Channel::Channel(grpc_channel *channel) : wrapped_channel(channel) {}

	Channel::~Channel() {
	gpr_log(GPR_DEBUG, "Destroying channel");
	if (wrapped_channel != NULL) {
	grpc_channel_destroy(wrapped_channel);
	}
	}

	void Channel::Init(Local<Object> exports) {
	Nan::HandleScope scope;
	Local<FunctionTemplate> tpl = Nan::New<FunctionTemplate>(New);
	tpl->SetClassName(Nan::New("Channel").ToLocalChecked());
	tpl->InstanceTemplate()->SetInternalFieldCount(1);
	Nan::SetPrototypeMethod(tpl, "close", Close);
	Nan::SetPrototypeMethod(tpl, "getTarget", GetTarget);
	Nan::SetPrototypeMethod(tpl, "getConnectivityState", GetConnectivityState);
	Nan::SetPrototypeMethod(tpl, "watchConnectivityState",
	WatchConnectivityState);
	fun_tpl.Reset(tpl);
	Local<Function> ctr = Nan::GetFunction(tpl).ToLocalChecked();
	Nan::Set(exports, Nan::New("Channel").ToLocalChecked(), ctr);
	constructor = new Callback(ctr);
	}

	bool Channel::HasInstance(Local<Value> val) {
	HandleScope scope;
	return Nan::New(fun_tpl)->HasInstance(val);
	}

	grpc_channel *Channel::GetWrappedChannel() { return this->wrapped_channel; }

	NAN_METHOD(Channel::New) {
	if (info.IsConstructCall()) {
	if (!info[0]->IsString()) {
	return Nan::ThrowTypeError(
	"Channel expects a string, a credential and an object");
	}
	grpc_channel *wrapped_channel;
	// Owned by the Channel object
	Utf8String host(info[0]);
	grpc_channel_credentials *creds;
	if (!ChannelCredentials::HasInstance(info[1])) {
	return Nan::ThrowTypeError(
	"Channel's second argument must be a ChannelCredentials");
	}
	ChannelCredentials *creds_object = ObjectWrap::Unwrap<ChannelCredentials>(
	Nan::To<Object>(info[1]).ToLocalChecked());
	creds = creds_object->GetWrappedCredentials();
	grpc_channel_args *channel_args_ptr = NULL;
	if (!ParseChannelArgs(info[2], &channel_args_ptr)) {
	DeallocateChannelArgs(channel_args_ptr);
	return Nan::ThrowTypeError(
	"Channel options must be an object with "
	"string keys and integer or string values");
	}
	if (creds == NULL) {
	wrapped_channel =
	grpc_insecure_channel_create(*host, channel_args_ptr, NULL);
	} else {
	wrapped_channel =
	grpc_secure_channel_create(creds, *host, channel_args_ptr, NULL);
	}
	DeallocateChannelArgs(channel_args_ptr);
	Channel *channel = new Channel(wrapped_channel);
	channel->Wrap(info.This());
	info.GetReturnValue().Set(info.This());
	return;
	} else {
	const int argc = 3;
	Local<Value> argv[argc] = {info[0], info[1], info[2]};
	MaybeLocal<Object> maybe_instance =
	Nan::NewInstance(constructor->GetFunction(), argc, argv);
	if (maybe_instance.IsEmpty()) {
	// There's probably a pending exception
	return;
	} else {
	info.GetReturnValue().Set(maybe_instance.ToLocalChecked());
	}
	}
	}

	NAN_METHOD(Channel::Close) {
	if (!HasInstance(info.This())) {
	return Nan::ThrowTypeError("close can only be called on Channel objects");
	}
	Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
	if (channel->wrapped_channel != NULL) {
	grpc_channel_destroy(channel->wrapped_channel);
	channel->wrapped_channel = NULL;
	}
	}

	NAN_METHOD(Channel::GetTarget) {
	if (!HasInstance(info.This())) {
	return Nan::ThrowTypeError(
	"getTarget can only be called on Channel objects");
	}
	Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
	info.GetReturnValue().Set(
	Nan::New(grpc_channel_get_target(channel->wrapped_channel))
	.ToLocalChecked());
	}

	NAN_METHOD(Channel::GetConnectivityState) {
	if (!HasInstance(info.This())) {
	return Nan::ThrowTypeError(
	"getConnectivityState can only be called on Channel objects");
	}
	Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
	int try_to_connect = (int)info[0]->Equals(Nan::True());
	info.GetReturnValue().Set(grpc_channel_check_connectivity_state(
	channel->wrapped_channel, try_to_connect));
	}

	NAN_METHOD(Channel::WatchConnectivityState) {
	if (!HasInstance(info.This())) {
	return Nan::ThrowTypeError(
	"watchConnectivityState can only be called on Channel objects");
	}
	if (!info[0]->IsUint32()) {
	return Nan::ThrowTypeError(
	"watchConnectivityState's first argument must be a channel state");
	}
	if (!(info[1]->IsNumber() \|\| info[1]->IsDate())) {
	return Nan::ThrowTypeError(
	"watchConnectivityState's second argument must be a date or a number");
	}
	if (!info[2]->IsFunction()) {
	return Nan::ThrowTypeError(
	"watchConnectivityState's third argument must be a callback");
	}
	grpc_connectivity_state last_state = static_cast<grpc_connectivity_state>(
	Nan::To<uint32_t>(info[0]).FromJust());
	double deadline = Nan::To<double>(info[1]).FromJust();
	Local<Function> callback_func = info[2].As<Function>();
	Nan::Callback *callback = new Callback(callback_func);
	Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
	unique_ptr<OpVec> ops(new OpVec());
	grpc_channel_watch_connectivity_state(
	channel->wrapped_channel, last_state, MillisecondsToTimespec(deadline),
	GetCompletionQueue(),
	new struct tag(callback, ops.release(), NULL, Nan::Null()));
	CompletionQueueNext();
	}

	} // namespace node
	} // namespace grpc