react-native/ReactCommon/cxxreact/SampleCxxModule.cpp

// Copyright 2004-present Facebook. All Rights Reserved.

#include "SampleCxxModule.h"
#include <cxxreact/JsArgumentHelpers.h>

#include <folly/Memory.h>
#include <glog/logging.h>

#include <thread>

using namespace folly;

namespace facebook { namespace xplat { namespace samples {

std::string Sample::hello() {
  LOG(WARNING) << "glog: hello, world";
  return "hello";
}

double Sample::add(double a, double b) {
  return a + b;
}

std::string Sample::concat(const std::string& a, const std::string& b) {
  return a + b;
}

std::string Sample::repeat(int count, const std::string& str) {
  std::string ret;
  for (int i = 0; i < count; i++) {
    ret += str;
  }

  return ret;
}

void Sample::save(std::map<std::string, std::string> dict)
{
  state_ = std::move(dict);
}

std::map<std::string, std::string> Sample::load() {
  return state_;
}

void Sample::except() {
// TODO mhorowitz #7128529: There's no way to automatically test this
// right now.
  // throw std::runtime_error("oops");
}

void Sample::call_later(int msec, std::function<void()> f) {
  std::thread t([=] {
      std::this_thread::sleep_for(std::chrono::milliseconds(msec));
      f();
    });
  t.detach();
}

double Sample::twice(double n) {
  return n * 2;
}

SampleCxxModule::SampleCxxModule(std::unique_ptr<Sample> sample)
  : sample_(std::move(sample)) {}

std::string SampleCxxModule::getName() {
  return "Sample";
}

auto SampleCxxModule::getConstants() -> std::map<std::string, folly::dynamic> {
  return {
    { "one", 1 },
    { "two", 2 },
    { "animal", "fox" },
  };
}

auto SampleCxxModule::getMethods() -> std::vector<Method> {
  return {
    Method("hello", [this] {
        sample_->hello();
      }),
    Method("add", [this](dynamic args, Callback cb) {
        LOG(WARNING) << "Sample: add => "
                     << sample_->add(jsArgAsDouble(args, 0), jsArgAsDouble(args, 1));
        cb({sample_->add(jsArgAsDouble(args, 0), jsArgAsDouble(args, 1))});
      }),
    Method("concat", [this](dynamic args, Callback cb) {
        cb({sample_->concat(jsArgAsString(args, 0),
                            jsArgAsString(args, 1))});
      }),
    Method("repeat", [this](dynamic args, Callback cb) {
        cb({sample_->repeat(jsArgAsInt(args, 0),
                            jsArgAsString(args, 1))});
      }),
    Method("save", this, &SampleCxxModule::save),
    Method("load", this, &SampleCxxModule::load),
    Method("call_later", [this](dynamic args, Callback cb) {
        sample_->call_later(jsArgAsInt(args, 0), [cb] {
            cb({});
          });
      }),
    Method("except", [this] {
        sample_->except();
      }),
    Method("twice", [this](dynamic args) -> dynamic {
        return sample_->twice(jsArgAsDouble(args, 0));
      }, SyncTag),
    Method("syncHello", [this]() -> dynamic {
        sample_->hello();
        return nullptr;
      }, SyncTag),
  };
}

void SampleCxxModule::save(folly::dynamic args) {
  std::map<std::string, std::string> m;
  for (const auto& p : jsArgN(args, 0, &dynamic::items)) {
    m.emplace(jsArg(p.first, &dynamic::asString, "map key"),
              jsArg(p.second, &dynamic::asString, "map value"));
  }
  sample_->save(std::move(m));
}

void SampleCxxModule::load(folly::dynamic args, Callback cb) {
  dynamic d = dynamic::object;
  for (const auto& p : sample_->load()) {
    d.insert(p.first, p.second);
  }
  cb({d});
}

}}}

// By convention, the function name should be the same as the class name.
facebook::xplat::module::CxxModule *SampleCxxModule() {
  return new facebook::xplat::samples::SampleCxxModule(
    folly::make_unique<facebook::xplat::samples::Sample>());
}