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/*
*
* Copyright 2015-2016 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
#include "src/core/ext/filters/client_channel/parse_address.h"
#include "src/core/ext/filters/client_channel/resolver_registry.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/host_port.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/iomgr/combiner.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/unix_sockets_posix.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
namespace grpc_core {
namespace {
class SockaddrResolver : public Resolver {
public:
/// Takes ownership of \a addresses.
SockaddrResolver(const ResolverArgs& args, grpc_lb_addresses* addresses);
void NextLocked(grpc_channel_args** result,
grpc_closure* on_complete) override;
void RequestReresolutionLocked() override;
void ShutdownLocked() override;
private:
virtual ~SockaddrResolver();
void MaybeFinishNextLocked();
/// the addresses that we've "resolved"
grpc_lb_addresses* addresses_ = nullptr;
/// channel args
grpc_channel_args* channel_args_ = nullptr;
/// have we published?
bool published_ = false;
/// pending next completion, or NULL
grpc_closure* next_completion_ = nullptr;
/// target result address for next completion
grpc_channel_args** target_result_ = nullptr;
};
SockaddrResolver::SockaddrResolver(const ResolverArgs& args,
grpc_lb_addresses* addresses)
: Resolver(args.combiner),
addresses_(addresses),
channel_args_(grpc_channel_args_copy(args.args)) {}
SockaddrResolver::~SockaddrResolver() {
grpc_lb_addresses_destroy(addresses_);
grpc_channel_args_destroy(channel_args_);
}
void SockaddrResolver::NextLocked(grpc_channel_args** target_result,
grpc_closure* on_complete) {
GPR_ASSERT(!next_completion_);
next_completion_ = on_complete;
target_result_ = target_result;
MaybeFinishNextLocked();
}
void SockaddrResolver::RequestReresolutionLocked() {
published_ = false;
MaybeFinishNextLocked();
}
void SockaddrResolver::ShutdownLocked() {
if (next_completion_ != nullptr) {
*target_result_ = nullptr;
GRPC_CLOSURE_SCHED(next_completion_, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"Resolver Shutdown"));
next_completion_ = nullptr;
}
}
void SockaddrResolver::MaybeFinishNextLocked() {
if (next_completion_ != nullptr && !published_) {
published_ = true;
grpc_arg arg = grpc_lb_addresses_create_channel_arg(addresses_);
*target_result_ = grpc_channel_args_copy_and_add(channel_args_, &arg, 1);
GRPC_CLOSURE_SCHED(next_completion_, GRPC_ERROR_NONE);
next_completion_ = nullptr;
}
}
//
// Factory
//
void DoNothing(void* ignored) {}
OrphanablePtr<Resolver> CreateSockaddrResolver(
const ResolverArgs& args,
bool parse(const grpc_uri* uri, grpc_resolved_address* dst)) {
if (0 != strcmp(args.uri->authority, "")) {
gpr_log(GPR_ERROR, "authority-based URIs not supported by the %s scheme",
args.uri->scheme);
return OrphanablePtr<Resolver>(nullptr);
}
// Construct addresses.
grpc_slice path_slice =
grpc_slice_new(args.uri->path, strlen(args.uri->path), DoNothing);
grpc_slice_buffer path_parts;
grpc_slice_buffer_init(&path_parts);
grpc_slice_split(path_slice, ",", &path_parts);
grpc_lb_addresses* addresses = grpc_lb_addresses_create(
path_parts.count, nullptr /* user_data_vtable */);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args.uri;
char* part_str = grpc_slice_to_c_string(path_parts.slices[i]);
ith_uri.path = part_str;
if (!parse(&ith_uri, &addresses->addresses[i].address)) {
errors_found = true; /* GPR_TRUE */
}
gpr_free(part_str);
if (errors_found) break;
}
grpc_slice_buffer_destroy_internal(&path_parts);
grpc_slice_unref_internal(path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(addresses);
return OrphanablePtr<Resolver>(nullptr);
}
// Instantiate resolver.
return OrphanablePtr<Resolver>(New<SockaddrResolver>(args, addresses));
}
class IPv4ResolverFactory : public ResolverFactory {
public:
OrphanablePtr<Resolver> CreateResolver(
const ResolverArgs& args) const override {
return CreateSockaddrResolver(args, grpc_parse_ipv4);
}
const char* scheme() const override { return "ipv4"; }
};
class IPv6ResolverFactory : public ResolverFactory {
public:
OrphanablePtr<Resolver> CreateResolver(
const ResolverArgs& args) const override {
return CreateSockaddrResolver(args, grpc_parse_ipv6);
}
const char* scheme() const override { return "ipv6"; }
};
#ifdef GRPC_HAVE_UNIX_SOCKET
class UnixResolverFactory : public ResolverFactory {
public:
OrphanablePtr<Resolver> CreateResolver(
const ResolverArgs& args) const override {
return CreateSockaddrResolver(args, grpc_parse_unix);
}
UniquePtr<char> GetDefaultAuthority(grpc_uri* uri) const override {
return UniquePtr<char>(gpr_strdup("localhost"));
}
const char* scheme() const override { return "unix"; }
};
#endif // GRPC_HAVE_UNIX_SOCKET
} // namespace
} // namespace grpc_core
void grpc_resolver_sockaddr_init() {
grpc_core::ResolverRegistry::Builder::RegisterResolverFactory(
grpc_core::UniquePtr<grpc_core::ResolverFactory>(
grpc_core::New<grpc_core::IPv4ResolverFactory>()));
grpc_core::ResolverRegistry::Builder::RegisterResolverFactory(
grpc_core::UniquePtr<grpc_core::ResolverFactory>(
grpc_core::New<grpc_core::IPv6ResolverFactory>()));
#ifdef GRPC_HAVE_UNIX_SOCKET
grpc_core::ResolverRegistry::Builder::RegisterResolverFactory(
grpc_core::UniquePtr<grpc_core::ResolverFactory>(
grpc_core::New<grpc_core::UnixResolverFactory>()));
#endif
}
void grpc_resolver_sockaddr_shutdown() {}
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