Initial checkin of gRPC to third_party/

third_party/grpc/src/node/ext/channel.cc

+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <vector>
+
+#include "grpc/support/log.h"
+
+#include <node.h>
+#include <nan.h>
+#include "grpc/grpc.h"
+#include "grpc/grpc_security.h"
+#include "call.h"
+#include "channel.h"
+#include "completion_queue_async_worker.h"
+#include "channel_credentials.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() {
+  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 = constructor->GetFunction()->NewInstance(
+        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),
+      CompletionQueueAsyncWorker::GetQueue(),
+      new struct tag(callback,
+                     ops.release(),
+                     shared_ptr<Resources>(nullptr)));
+  CompletionQueueAsyncWorker::Next();
+}
+
+}  // namespace node
+}  // namespace grpc