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/*
*
* 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 "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/gpr/string.h"
#include "src/core/lib/iomgr/ev_posix.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
namespace grpc_core {
class GrpcPolledFdPosix : public GrpcPolledFd {
public:
GrpcPolledFdPosix(ares_socket_t as, grpc_pollset_set* driver_pollset_set)
: as_(as) {
gpr_asprintf(&name_, "c-ares fd: %d", (int)as);
fd_ = grpc_fd_create((int)as, name_, false);
driver_pollset_set_ = driver_pollset_set;
grpc_pollset_set_add_fd(driver_pollset_set_, fd_);
}
~GrpcPolledFdPosix() {
gpr_free(name_);
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 dummy_release_fd;
grpc_fd_orphan(fd_, nullptr, &dummy_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* error) override {
grpc_fd_shutdown(fd_, error);
}
ares_socket_t GetWrappedAresSocketLocked() override { return as_; }
const char* GetName() override { return name_; }
char* 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,
grpc_combiner* combiner) override {
return New<GrpcPolledFdPosix>(as, driver_pollset_set);
}
void ConfigureAresChannelLocked(ares_channel channel) override {}
};
UniquePtr<GrpcPolledFdFactory> NewGrpcPolledFdFactory(grpc_combiner* combiner) {
return UniquePtr<GrpcPolledFdFactory>(New<GrpcPolledFdFactoryPosix>());
}
} // namespace grpc_core
#endif /* GRPC_ARES == 1 && defined(GRPC_POSIX_SOCKET_ARES_EV_DRIVER) */
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