| /* |
| * |
| * Copyright 2016 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 <grpc/support/port_platform.h> |
| |
| #include "src/core/lib/iomgr/port.h" |
| #if GRPC_ARES == 1 && defined(GRPC_POSIX_SOCKET_ARES_EV_DRIVER) |
| |
| #include <ares.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| |
| #include "absl/strings/str_cat.h" |
| |
| #include "src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/time.h> |
| #include "src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h" |
| #include "src/core/lib/address_utils/sockaddr_utils.h" |
| #include "src/core/lib/gpr/string.h" |
| #include "src/core/lib/iomgr/ev_posix.h" |
| #include "src/core/lib/iomgr/iomgr_internal.h" |
| |
| namespace grpc_core { |
| |
| class GrpcPolledFdPosix : public GrpcPolledFd { |
| public: |
| GrpcPolledFdPosix(ares_socket_t as, grpc_pollset_set* driver_pollset_set) |
| : name_(absl::StrCat("c-ares fd: ", static_cast<int>(as))), as_(as) { |
| fd_ = grpc_fd_create(static_cast<int>(as), name_.c_str(), false); |
| driver_pollset_set_ = driver_pollset_set; |
| grpc_pollset_set_add_fd(driver_pollset_set_, fd_); |
| } |
| |
| ~GrpcPolledFdPosix() override { |
| grpc_pollset_set_del_fd(driver_pollset_set_, fd_); |
| /* c-ares library will close the fd inside grpc_fd. This fd may be picked up |
| immediately by another thread, and should not be closed by the following |
| grpc_fd_orphan. */ |
| int phony_release_fd; |
| grpc_fd_orphan(fd_, nullptr, &phony_release_fd, "c-ares query finished"); |
| } |
| |
| void RegisterForOnReadableLocked(grpc_closure* read_closure) override { |
| grpc_fd_notify_on_read(fd_, read_closure); |
| } |
| |
| void RegisterForOnWriteableLocked(grpc_closure* write_closure) override { |
| grpc_fd_notify_on_write(fd_, write_closure); |
| } |
| |
| bool IsFdStillReadableLocked() override { |
| size_t bytes_available = 0; |
| return ioctl(grpc_fd_wrapped_fd(fd_), FIONREAD, &bytes_available) == 0 && |
| bytes_available > 0; |
| } |
| |
| void ShutdownLocked(grpc_error_handle error) override { |
| grpc_fd_shutdown(fd_, error); |
| } |
| |
| ares_socket_t GetWrappedAresSocketLocked() override { return as_; } |
| |
| const char* GetName() override { return name_.c_str(); } |
| |
| private: |
| std::string name_; |
| ares_socket_t as_; |
| grpc_fd* fd_; |
| grpc_pollset_set* driver_pollset_set_; |
| }; |
| |
| class GrpcPolledFdFactoryPosix : public GrpcPolledFdFactory { |
| public: |
| GrpcPolledFd* NewGrpcPolledFdLocked( |
| ares_socket_t as, grpc_pollset_set* driver_pollset_set, |
| std::shared_ptr<WorkSerializer> /*work_serializer*/) override { |
| return new GrpcPolledFdPosix(as, driver_pollset_set); |
| } |
| |
| void ConfigureAresChannelLocked(ares_channel /*channel*/) override {} |
| }; |
| |
| std::unique_ptr<GrpcPolledFdFactory> NewGrpcPolledFdFactory( |
| std::shared_ptr<WorkSerializer> work_serializer) { |
| (void)work_serializer; |
| return absl::make_unique<GrpcPolledFdFactoryPosix>(); |
| } |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_ARES == 1 && defined(GRPC_POSIX_SOCKET_ARES_EV_DRIVER) */ |