mirror of https://github.com/grpc/grpc-node.git
273 lines
8.9 KiB
C++
273 lines
8.9 KiB
C++
/*
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*
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* Copyright 2015 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include <vector>
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#include "grpc/support/log.h"
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#include <nan.h>
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#include <node.h>
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#include "call.h"
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#include "channel.h"
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#include "channel_credentials.h"
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#include "completion_queue.h"
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#include "grpc/grpc.h"
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#include "grpc/grpc_security.h"
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#include "timeval.h"
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namespace grpc {
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namespace node {
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using Nan::Callback;
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using Nan::EscapableHandleScope;
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using Nan::HandleScope;
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using Nan::Maybe;
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using Nan::MaybeLocal;
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using Nan::ObjectWrap;
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using Nan::Persistent;
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using Nan::Utf8String;
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using v8::Array;
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using v8::Exception;
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using v8::Function;
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using v8::FunctionTemplate;
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using v8::Integer;
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using v8::Local;
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using v8::Number;
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using v8::Object;
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using v8::String;
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using v8::Value;
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Callback *Channel::constructor;
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Persistent<FunctionTemplate> Channel::fun_tpl;
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bool ParseChannelArgs(Local<Value> args_val,
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grpc_channel_args **channel_args_ptr) {
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if (args_val->IsUndefined() || args_val->IsNull()) {
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*channel_args_ptr = NULL;
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return true;
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}
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if (!args_val->IsObject()) {
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*channel_args_ptr = NULL;
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return false;
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}
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grpc_channel_args *channel_args =
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reinterpret_cast<grpc_channel_args *>(malloc(sizeof(grpc_channel_args)));
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*channel_args_ptr = channel_args;
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Local<Object> args_hash = Nan::To<Object>(args_val).ToLocalChecked();
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Local<Array> keys = Nan::GetOwnPropertyNames(args_hash).ToLocalChecked();
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channel_args->num_args = keys->Length();
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channel_args->args = reinterpret_cast<grpc_arg *>(
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calloc(channel_args->num_args, sizeof(grpc_arg)));
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for (unsigned int i = 0; i < channel_args->num_args; i++) {
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Local<Value> key = Nan::Get(keys, i).ToLocalChecked();
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Utf8String key_str(key);
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if (*key_str == NULL) {
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// Key string onversion failed
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return false;
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}
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Local<Value> value = Nan::Get(args_hash, key).ToLocalChecked();
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if (value->IsInt32()) {
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channel_args->args[i].type = GRPC_ARG_INTEGER;
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channel_args->args[i].value.integer = Nan::To<int32_t>(value).FromJust();
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} else if (value->IsString()) {
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Utf8String val_str(value);
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channel_args->args[i].type = GRPC_ARG_STRING;
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channel_args->args[i].value.string =
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reinterpret_cast<char *>(calloc(val_str.length() + 1, sizeof(char)));
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memcpy(channel_args->args[i].value.string, *val_str,
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val_str.length() + 1);
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} else {
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// The value does not match either of the accepted types
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return false;
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}
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channel_args->args[i].key =
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reinterpret_cast<char *>(calloc(key_str.length() + 1, sizeof(char)));
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memcpy(channel_args->args[i].key, *key_str, key_str.length() + 1);
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}
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return true;
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}
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void DeallocateChannelArgs(grpc_channel_args *channel_args) {
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if (channel_args == NULL) {
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return;
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}
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for (size_t i = 0; i < channel_args->num_args; i++) {
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if (channel_args->args[i].key == NULL) {
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/* NULL key implies that this argument and all subsequent arguments failed
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* to parse */
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break;
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}
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free(channel_args->args[i].key);
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if (channel_args->args[i].type == GRPC_ARG_STRING) {
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free(channel_args->args[i].value.string);
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}
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}
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free(channel_args->args);
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free(channel_args);
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}
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Channel::Channel(grpc_channel *channel) : wrapped_channel(channel) {}
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Channel::~Channel() {
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gpr_log(GPR_DEBUG, "Destroying channel");
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if (wrapped_channel != NULL) {
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grpc_channel_destroy(wrapped_channel);
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}
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}
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void Channel::Init(Local<Object> exports) {
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Nan::HandleScope scope;
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Local<FunctionTemplate> tpl = Nan::New<FunctionTemplate>(New);
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tpl->SetClassName(Nan::New("Channel").ToLocalChecked());
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tpl->InstanceTemplate()->SetInternalFieldCount(1);
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Nan::SetPrototypeMethod(tpl, "close", Close);
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Nan::SetPrototypeMethod(tpl, "getTarget", GetTarget);
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Nan::SetPrototypeMethod(tpl, "getConnectivityState", GetConnectivityState);
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Nan::SetPrototypeMethod(tpl, "watchConnectivityState",
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WatchConnectivityState);
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fun_tpl.Reset(tpl);
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Local<Function> ctr = Nan::GetFunction(tpl).ToLocalChecked();
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Nan::Set(exports, Nan::New("Channel").ToLocalChecked(), ctr);
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constructor = new Callback(ctr);
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}
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bool Channel::HasInstance(Local<Value> val) {
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HandleScope scope;
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return Nan::New(fun_tpl)->HasInstance(val);
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}
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grpc_channel *Channel::GetWrappedChannel() { return this->wrapped_channel; }
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NAN_METHOD(Channel::New) {
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if (info.IsConstructCall()) {
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if (!info[0]->IsString()) {
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return Nan::ThrowTypeError(
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"Channel expects a string, a credential and an object");
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}
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grpc_channel *wrapped_channel;
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// Owned by the Channel object
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Utf8String host(info[0]);
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grpc_channel_credentials *creds;
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if (!ChannelCredentials::HasInstance(info[1])) {
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return Nan::ThrowTypeError(
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"Channel's second argument must be a ChannelCredentials");
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}
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ChannelCredentials *creds_object = ObjectWrap::Unwrap<ChannelCredentials>(
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Nan::To<Object>(info[1]).ToLocalChecked());
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creds = creds_object->GetWrappedCredentials();
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grpc_channel_args *channel_args_ptr = NULL;
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if (!ParseChannelArgs(info[2], &channel_args_ptr)) {
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DeallocateChannelArgs(channel_args_ptr);
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return Nan::ThrowTypeError(
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"Channel options must be an object with "
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"string keys and integer or string values");
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}
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if (creds == NULL) {
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wrapped_channel =
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grpc_insecure_channel_create(*host, channel_args_ptr, NULL);
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} else {
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wrapped_channel =
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grpc_secure_channel_create(creds, *host, channel_args_ptr, NULL);
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}
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DeallocateChannelArgs(channel_args_ptr);
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Channel *channel = new Channel(wrapped_channel);
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channel->Wrap(info.This());
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info.GetReturnValue().Set(info.This());
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return;
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} else {
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const int argc = 3;
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Local<Value> argv[argc] = {info[0], info[1], info[2]};
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MaybeLocal<Object> maybe_instance =
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Nan::NewInstance(constructor->GetFunction(), argc, argv);
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if (maybe_instance.IsEmpty()) {
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// There's probably a pending exception
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return;
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} else {
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info.GetReturnValue().Set(maybe_instance.ToLocalChecked());
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}
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}
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}
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NAN_METHOD(Channel::Close) {
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if (!HasInstance(info.This())) {
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return Nan::ThrowTypeError("close can only be called on Channel objects");
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}
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Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
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if (channel->wrapped_channel != NULL) {
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grpc_channel_destroy(channel->wrapped_channel);
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channel->wrapped_channel = NULL;
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}
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}
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NAN_METHOD(Channel::GetTarget) {
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if (!HasInstance(info.This())) {
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return Nan::ThrowTypeError(
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"getTarget can only be called on Channel objects");
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}
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Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
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info.GetReturnValue().Set(
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Nan::New(grpc_channel_get_target(channel->wrapped_channel))
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.ToLocalChecked());
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}
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NAN_METHOD(Channel::GetConnectivityState) {
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if (!HasInstance(info.This())) {
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return Nan::ThrowTypeError(
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"getConnectivityState can only be called on Channel objects");
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}
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Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
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int try_to_connect = (int)info[0]->Equals(Nan::True());
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info.GetReturnValue().Set(grpc_channel_check_connectivity_state(
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channel->wrapped_channel, try_to_connect));
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}
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NAN_METHOD(Channel::WatchConnectivityState) {
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if (!HasInstance(info.This())) {
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return Nan::ThrowTypeError(
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"watchConnectivityState can only be called on Channel objects");
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}
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if (!info[0]->IsUint32()) {
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return Nan::ThrowTypeError(
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"watchConnectivityState's first argument must be a channel state");
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}
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if (!(info[1]->IsNumber() || info[1]->IsDate())) {
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return Nan::ThrowTypeError(
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"watchConnectivityState's second argument must be a date or a number");
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}
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if (!info[2]->IsFunction()) {
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return Nan::ThrowTypeError(
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"watchConnectivityState's third argument must be a callback");
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}
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grpc_connectivity_state last_state = static_cast<grpc_connectivity_state>(
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Nan::To<uint32_t>(info[0]).FromJust());
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double deadline = Nan::To<double>(info[1]).FromJust();
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Local<Function> callback_func = info[2].As<Function>();
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Nan::Callback *callback = new Callback(callback_func);
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Channel *channel = ObjectWrap::Unwrap<Channel>(info.This());
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unique_ptr<OpVec> ops(new OpVec());
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grpc_channel_watch_connectivity_state(
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channel->wrapped_channel, last_state, MillisecondsToTimespec(deadline),
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GetCompletionQueue(),
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new struct tag(callback, ops.release(), NULL, Nan::Null()));
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CompletionQueueNext();
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}
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} // namespace node
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} // namespace grpc
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