CFStream tcp client and endpoint

pull/15459/head
Muxi Yan 7 years ago
parent 6abc0aef5d
commit cdf709c76e
  1. 52
      src/core/lib/iomgr/tcp_cfstream.h
  2. 330
      src/core/lib/iomgr/tcp_cfstream.mm
  3. 203
      src/core/lib/iomgr/tcp_client_cfstream.mm

@ -0,0 +1,52 @@
/*
*
* Copyright 2018 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.
*
*/
#ifndef GRPC_CORE_LIB_IOMGR_TCP_CFSTREAM_H
#define GRPC_CORE_LIB_IOMGR_TCP_CFSTREAM_H
/*
Low level TCP "bottom half" implementation, for use by transports built on
top of a TCP connection.
Note that this file does not (yet) include APIs for creating the socket in
the first place.
All calls passing slice transfer ownership of a slice refcount unless
otherwise specified.
*/
#include <grpc/support/port_platform.h>
#ifdef GRPC_CFSTREAM
#import <Foundation/Foundation.h>
#include "src/core/lib/debug/trace.h"
#include "src/core/lib/iomgr/endpoint.h"
#include "src/core/lib/iomgr/tcp_cfstream_sync.h"
extern grpc_core::TraceFlag grpc_tcp_trace;
grpc_endpoint* grpc_tcp_create(CFReadStreamRef read_stream,
CFWriteStreamRef write_stream,
const char* peer_string,
grpc_resource_quota* resource_quota,
CFStreamSync* stream_sync);
#endif /* GRPC_CFSTREAM */
#endif /* GRPC_CORE_LIB_IOMGR_TCP_CFSTREAM_H */

@ -0,0 +1,330 @@
/*
*
* Copyright 2018 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"
#ifdef GRPC_CFSTREAM_TCP
#import <Foundation/Foundation.h>
#import "src/core/lib/iomgr/tcp_cfstream.h"
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/endpoint.h"
#include "src/core/lib/iomgr/error_apple.h"
#include "src/core/lib/iomgr/tcp_cfstream_sync.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
extern grpc_core::TraceFlag grpc_tcp_trace;
typedef struct {
grpc_endpoint base;
gpr_refcount refcount;
CFReadStreamRef read_stream;
CFWriteStreamRef write_stream;
CFStreamSync* stream_sync;
grpc_closure* read_cb;
grpc_closure* write_cb;
grpc_slice_buffer* read_slices;
grpc_slice_buffer* write_slices;
grpc_closure read_action;
grpc_closure write_action;
CFStreamEventType read_type;
char* peer_string;
grpc_resource_user* resource_user;
grpc_resource_user_slice_allocator slice_allocator;
} CFStreamTCP;
static void TCPFree(CFStreamTCP* tcp) {
grpc_resource_user_unref(tcp->resource_user);
CFRelease(tcp->read_stream);
CFRelease(tcp->write_stream);
CFSTREAM_SYNC_UNREF(tcp->stream_sync, "free");
gpr_free(tcp->peer_string);
gpr_free(tcp);
}
#ifndef NDEBUG
#define TCP_REF(tcp, reason) tcp_ref((tcp), (reason), __FILE__, __LINE__)
#define TCP_UNREF(tcp, reason) tcp_unref((tcp), (reason), __FILE__, __LINE__)
static void tcp_unref(CFStreamTCP* tcp, const char* reason, const char* file, int line) {
if (grpc_tcp_trace.enabled()) {
gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count);
gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP unref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp,
reason, val, val - 1);
}
if (gpr_unref(&tcp->refcount)) {
TCPFree(tcp);
}
}
static void tcp_ref(CFStreamTCP* tcp, const char* reason, const char* file, int line) {
if (grpc_tcp_trace.enabled()) {
gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count);
gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP ref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp,
reason, val, val + 1);
}
gpr_ref(&tcp->refcount);
}
#else
#define TCP_REF(tcp, reason) tcp_ref((tcp))
#define TCP_UNREF(tcp, reason) tcp_unref((tcp))
static void tcp_unref(CFStreamTCP* tcp) {
if (gpr_unref(&tcp->refcount)) {
tcp_free(tcp);
}
}
static void tcp_ref(CFStreamTCP* tcp) { gpr_ref(&tcp->refcount); }
#endif
static grpc_error* TCPAnnotateError(grpc_error* src_error, CFStreamTCP* tcp) {
return grpc_error_set_str(
grpc_error_set_int(src_error, GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_UNAVAILABLE),
GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(tcp->peer_string));
}
static void CallReadCB(CFStreamTCP* tcp, grpc_error* error) {
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "TCP:%p call_read_cb %p %p:%p", tcp, tcp->read_cb, tcp->read_cb->cb,
tcp->read_cb->cb_arg);
size_t i;
const char* str = grpc_error_string(error);
gpr_log(GPR_DEBUG, "read: error=%s", str);
for (i = 0; i < tcp->read_slices->count; i++) {
char* dump = grpc_dump_slice(tcp->read_slices->slices[i], GPR_DUMP_HEX | GPR_DUMP_ASCII);
gpr_log(GPR_DEBUG, "READ %p (peer=%s): %s", tcp, tcp->peer_string, dump);
gpr_free(dump);
}
}
grpc_closure* cb = tcp->read_cb;
tcp->read_cb = nullptr;
tcp->read_slices = nullptr;
GRPC_CLOSURE_RUN(cb, error);
}
static void CallWriteCB(CFStreamTCP* tcp, grpc_error* error) {
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "TCP:%p call_write_cb %p %p:%p", tcp, tcp->write_cb, tcp->write_cb->cb,
tcp->write_cb->cb_arg);
const char* str = grpc_error_string(error);
gpr_log(GPR_DEBUG, "write: error=%s", str);
}
grpc_closure* cb = tcp->write_cb;
tcp->write_cb = nullptr;
tcp->write_slices = nullptr;
GRPC_CLOSURE_RUN(cb, error);
}
static void ReadAction(void* arg, grpc_error* error) {
CFStreamTCP* tcp = static_cast<CFStreamTCP*>(arg);
GPR_ASSERT(tcp->read_cb != nullptr);
if (error) {
grpc_slice_buffer_reset_and_unref_internal(tcp->read_slices);
CallReadCB(tcp, GRPC_ERROR_REF(error));
TCP_UNREF(tcp, "read");
return;
}
GPR_ASSERT(tcp->read_slices->count == 1);
grpc_slice slice = tcp->read_slices->slices[0];
size_t len = GRPC_SLICE_LENGTH(slice);
CFIndex read_size = CFReadStreamRead(tcp->read_stream, GRPC_SLICE_START_PTR(slice), len);
if (read_size == -1) {
grpc_slice_buffer_reset_and_unref_internal(tcp->read_slices);
CFErrorRef stream_error = CFReadStreamCopyError(tcp->read_stream);
CallReadCB(tcp,
TCPAnnotateError(GRPC_ERROR_CREATE_FROM_CFERROR(stream_error, "Read error"), tcp));
CFRelease(stream_error);
TCP_UNREF(tcp, "read");
} else if (read_size == 0) {
grpc_slice_buffer_reset_and_unref_internal(tcp->read_slices);
CallReadCB(tcp, TCPAnnotateError(GRPC_ERROR_CREATE_FROM_STATIC_STRING("Socket closed"), tcp));
TCP_UNREF(tcp, "read");
} else {
if (read_size < len) {
grpc_slice_buffer_trim_end(tcp->read_slices, len - read_size, nullptr);
}
CallReadCB(tcp, GRPC_ERROR_NONE);
TCP_UNREF(tcp, "read");
}
}
static void WriteAction(void* arg, grpc_error* error) {
CFStreamTCP* tcp = static_cast<CFStreamTCP*>(arg);
GPR_ASSERT(tcp->write_cb != nullptr);
if (error) {
grpc_slice_buffer_reset_and_unref_internal(tcp->write_slices);
CallWriteCB(tcp, GRPC_ERROR_REF(error));
TCP_UNREF(tcp, "write");
return;
}
grpc_slice slice = grpc_slice_buffer_take_first(tcp->write_slices);
size_t slice_len = GRPC_SLICE_LENGTH(slice);
CFIndex write_size =
CFWriteStreamWrite(tcp->write_stream, GRPC_SLICE_START_PTR(slice), slice_len);
if (write_size == -1) {
grpc_slice_buffer_reset_and_unref_internal(tcp->write_slices);
CFErrorRef stream_error = CFWriteStreamCopyError(tcp->write_stream);
CallWriteCB(
tcp, TCPAnnotateError(GRPC_ERROR_CREATE_FROM_CFERROR(stream_error, "write failed."), tcp));
CFRelease(stream_error);
TCP_UNREF(tcp, "write");
} else {
if (write_size < GRPC_SLICE_LENGTH(slice)) {
grpc_slice_buffer_undo_take_first(tcp->write_slices,
grpc_slice_sub(slice, write_size, slice_len));
}
if (tcp->write_slices->length > 0) {
tcp->stream_sync->NotifyOnWrite(&tcp->write_action);
} else {
CallWriteCB(tcp, GRPC_ERROR_NONE);
TCP_UNREF(tcp, "write");
}
if (grpc_tcp_trace.enabled()) {
grpc_slice trace_slice = grpc_slice_sub(slice, 0, write_size);
char* dump = grpc_dump_slice(trace_slice, GPR_DUMP_HEX | GPR_DUMP_ASCII);
gpr_log(GPR_DEBUG, "WRITE %p (peer=%s): %s", tcp, tcp->peer_string, dump);
gpr_free(dump);
grpc_slice_unref(trace_slice);
}
}
grpc_slice_unref(slice);
}
static void TCPReadAllocationDone(void* arg, grpc_error* error) {
CFStreamTCP* tcp = static_cast<CFStreamTCP*>(arg);
if (error == GRPC_ERROR_NONE) {
tcp->stream_sync->NotifyOnRead(&tcp->read_action);
} else {
grpc_slice_buffer_reset_and_unref_internal(tcp->read_slices);
CallReadCB(tcp, error);
TCP_UNREF(tcp, "read");
}
}
static void TCPRead(grpc_endpoint* ep, grpc_slice_buffer* slices, grpc_closure* cb) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "tcp:%p read (%p, %p) length:%zu", tcp, slices, cb, slices->length);
}
GPR_ASSERT(tcp->read_cb == nullptr);
tcp->read_cb = cb;
tcp->read_slices = slices;
grpc_slice_buffer_reset_and_unref_internal(slices);
grpc_resource_user_alloc_slices(&tcp->slice_allocator, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, 1,
tcp->read_slices);
TCP_REF(tcp, "read");
}
static void TCPWrite(grpc_endpoint* ep, grpc_slice_buffer* slices, grpc_closure* cb) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "tcp:%p write (%p, %p) length:%zu", tcp, slices, cb, slices->length);
}
GPR_ASSERT(tcp->write_cb == nullptr);
tcp->write_cb = cb;
tcp->write_slices = slices;
TCP_REF(tcp, "write");
tcp->stream_sync->NotifyOnWrite(&tcp->write_action);
}
void TCPShutdown(grpc_endpoint* ep, grpc_error* why) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "tcp:%p shutdown (%p)", tcp, why);
}
CFReadStreamClose(tcp->read_stream);
CFWriteStreamClose(tcp->write_stream);
tcp->stream_sync->Shutdown(why);
grpc_resource_user_shutdown(tcp->resource_user);
}
void TCPDestroy(grpc_endpoint* ep) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "tcp:%p destroy", tcp);
}
TCP_UNREF(tcp, "destroy");
}
grpc_resource_user* TCPGetResourceUser(grpc_endpoint* ep) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
return tcp->resource_user;
}
char* TCPGetPeer(grpc_endpoint* ep) {
CFStreamTCP* tcp = reinterpret_cast<CFStreamTCP*>(ep);
return gpr_strdup(tcp->peer_string);
}
int TCPGetFD(grpc_endpoint* ep) { return 0; }
void TCPAddToPollset(grpc_endpoint* ep, grpc_pollset* pollset) {}
void TCPAddToPollsetSet(grpc_endpoint* ep, grpc_pollset_set* pollset) {}
void TCPDeleteFromPollsetSet(grpc_endpoint* ep, grpc_pollset_set* pollset) {}
static const grpc_endpoint_vtable vtable = {
TCPRead, TCPWrite, TCPAddToPollset, TCPAddToPollsetSet, TCPDeleteFromPollsetSet,
TCPShutdown, TCPDestroy, TCPGetResourceUser, TCPGetPeer, TCPGetFD};
grpc_endpoint* grpc_tcp_create(CFReadStreamRef read_stream, CFWriteStreamRef write_stream,
const char* peer_string, grpc_resource_quota* resource_quota,
CFStreamSync* stream_sync) {
CFStreamTCP* tcp = static_cast<CFStreamTCP*>(gpr_malloc(sizeof(CFStreamTCP)));
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "tcp:%p create readStream:%p writeStream: %p", tcp, read_stream,
write_stream);
}
tcp->base.vtable = &vtable;
gpr_ref_init(&tcp->refcount, 1);
tcp->read_stream = read_stream;
tcp->write_stream = write_stream;
CFRetain(read_stream);
CFRetain(write_stream);
tcp->stream_sync = stream_sync;
CFSTREAM_SYNC_REF(tcp->stream_sync, "endpoint create");
tcp->peer_string = gpr_strdup(peer_string);
tcp->read_cb = nil;
tcp->write_cb = nil;
tcp->read_slices = nil;
tcp->write_slices = nil;
GRPC_CLOSURE_INIT(&tcp->read_action, ReadAction, static_cast<void*>(tcp),
grpc_schedule_on_exec_ctx);
GRPC_CLOSURE_INIT(&tcp->write_action, WriteAction, static_cast<void*>(tcp),
grpc_schedule_on_exec_ctx);
tcp->resource_user = grpc_resource_user_create(resource_quota, peer_string);
grpc_resource_user_slice_allocator_init(&tcp->slice_allocator, tcp->resource_user,
TCPReadAllocationDone, tcp);
return &tcp->base;
}
#endif /* GRPC_CFSTREAM_TCP */

@ -0,0 +1,203 @@
/*
*
* Copyright 2018 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"
#ifdef GRPC_CFSTREAM_TCP_CLIENT
#include <Foundation/Foundation.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <netinet/in.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/host_port.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/error_apple.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/iomgr/tcp_cfstream.h"
#include "src/core/lib/iomgr/tcp_cfstream_sync.h"
#include "src/core/lib/iomgr/tcp_client.h"
#include "src/core/lib/iomgr/timer.h"
extern grpc_core::TraceFlag grpc_tcp_trace;
typedef struct CFStreamTCPConnect {
gpr_mu mu;
gpr_refcount refcount;
CFReadStreamRef read_stream;
CFWriteStreamRef write_stream;
CFStreamSync* stream_sync;
grpc_timer alarm;
grpc_closure on_alarm;
grpc_closure on_open;
bool read_stream_open;
bool write_stream_open;
bool failed;
grpc_closure* closure;
grpc_endpoint** endpoint;
int refs;
char* addr_name;
grpc_resource_quota* resource_quota;
} CFStreamTCPConnect;
static void TCPConnectCleanup(CFStreamTCPConnect* connect) {
grpc_resource_quota_unref_internal(connect->resource_quota);
CFSTREAM_SYNC_UNREF(connect->stream_sync, "async connect clean up");
CFRelease(connect->read_stream);
CFRelease(connect->write_stream);
gpr_mu_destroy(&connect->mu);
gpr_free(connect->addr_name);
gpr_free(connect);
}
static void OnAlarm(void* arg, grpc_error* error) {
CFStreamTCPConnect* connect = static_cast<CFStreamTCPConnect*>(arg);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "CLIENT_CONNECT :%p OnAlarm, error:%p", connect, error);
}
gpr_mu_lock(&connect->mu);
grpc_closure* closure = connect->closure;
connect->closure = nil;
const bool done = (--connect->refs == 0);
gpr_mu_unlock(&connect->mu);
// Only schedule a callback once, by either on_timer or on_connected. The first one issues
// callback while the second one does cleanup.
if (done) {
TCPConnectCleanup(connect);
} else {
grpc_error* error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("connect() timed out");
GRPC_CLOSURE_SCHED(closure, error);
}
}
static void OnOpen(void* arg, grpc_error* error) {
CFStreamTCPConnect* connect = static_cast<CFStreamTCPConnect*>(arg);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "CLIENT_CONNECT :%p OnOpen, error:%p", connect, error);
}
gpr_mu_lock(&connect->mu);
grpc_timer_cancel(&connect->alarm);
grpc_closure* closure = connect->closure;
connect->closure = nil;
bool done = (--connect->refs == 0);
grpc_endpoint** endpoint = connect->endpoint;
if (done) {
gpr_mu_unlock(&connect->mu);
TCPConnectCleanup(connect);
} else {
if (error == GRPC_ERROR_NONE) {
CFErrorRef stream_error = CFReadStreamCopyError(connect->read_stream);
if (stream_error == NULL) {
stream_error = CFWriteStreamCopyError(connect->write_stream);
}
if (stream_error) {
error = GRPC_ERROR_CREATE_FROM_CFERROR(stream_error, "connect() error");
CFRelease(stream_error);
}
if (error == GRPC_ERROR_NONE) {
*endpoint = grpc_tcp_create(connect->read_stream, connect->write_stream, connect->addr_name,
connect->resource_quota, connect->stream_sync);
}
}
gpr_mu_unlock(&connect->mu);
GRPC_CLOSURE_SCHED(closure, GRPC_ERROR_REF(error));
}
}
static void ParseResolvedAddress(const grpc_resolved_address* addr, CFStringRef* host, int* port) {
char *host_port, *host_string, *port_string;
grpc_sockaddr_to_string(&host_port, addr, 1);
gpr_split_host_port(host_port, &host_string, &port_string);
*host = CFStringCreateWithCString(NULL, host_string, kCFStringEncodingUTF8);
gpr_free(host_string);
gpr_free(port_string);
gpr_free(host_port);
*port = grpc_sockaddr_get_port(addr);
}
static void TCPClientConnect(grpc_closure* closure, grpc_endpoint** ep,
grpc_pollset_set* interested_parties,
const grpc_channel_args* channel_args,
const grpc_resolved_address* resolved_addr, grpc_millis deadline) {
CFStreamTCPConnect* connect;
connect = (CFStreamTCPConnect*)gpr_zalloc(sizeof(CFStreamTCPConnect));
connect->closure = closure;
connect->endpoint = ep;
connect->addr_name = grpc_sockaddr_to_uri(resolved_addr);
// connect->resource_quota = resource_quota;
connect->refs = 2; // One for the connect operation, one for the timer.
gpr_ref_init(&connect->refcount, 1);
gpr_mu_init(&connect->mu);
if (grpc_tcp_trace.enabled()) {
gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting", connect->addr_name);
}
grpc_resource_quota* resource_quota = grpc_resource_quota_create(NULL);
if (channel_args != NULL) {
for (size_t i = 0; i < channel_args->num_args; i++) {
if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_RESOURCE_QUOTA)) {
grpc_resource_quota_unref_internal(resource_quota);
resource_quota = grpc_resource_quota_ref_internal(
(grpc_resource_quota*)channel_args->args[i].value.pointer.p);
}
}
}
connect->resource_quota = resource_quota;
CFReadStreamRef read_stream;
CFWriteStreamRef write_stream;
CFStringRef host;
int port;
ParseResolvedAddress(resolved_addr, &host, &port);
CFStreamCreatePairWithSocketToHost(NULL, host, port, &read_stream, &write_stream);
CFRelease(host);
connect->read_stream = read_stream;
connect->write_stream = write_stream;
connect->stream_sync = CFStreamSync::CreateStreamSync(read_stream, write_stream);
GRPC_CLOSURE_INIT(&connect->on_open, OnOpen, static_cast<void*>(connect),
grpc_schedule_on_exec_ctx);
connect->stream_sync->NotifyOnOpen(&connect->on_open);
GRPC_CLOSURE_INIT(&connect->on_alarm, OnAlarm, connect, grpc_schedule_on_exec_ctx);
gpr_mu_lock(&connect->mu);
CFReadStreamOpen(read_stream);
CFWriteStreamOpen(write_stream);
grpc_timer_init(&connect->alarm, deadline, &connect->on_alarm);
gpr_mu_unlock(&connect->mu);
}
grpc_tcp_client_vtable grpc_posix_tcp_client_vtable = {TCPClientConnect};
#endif /* GRPC_CFSTREAM_TCP_CLIENT */
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