src/core/lib/iomgr/event_engine/endpoint.cc

   1 // Copyright 2021 The gRPC Authors
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 #include <grpc/support/port_platform.h>
  15
  16 #ifdef GRPC_USE_EVENT_ENGINE
  17 #include "src/core/lib/iomgr/event_engine/endpoint.h"
  18
  19 #include <grpc/event_engine/event_engine.h>
  20 #include <grpc/slice.h>
  21 #include <grpc/slice_buffer.h>
  22 #include <grpc/support/time.h>
  23 #include "absl/strings/string_view.h"
  24
  25 #include "src/core/lib/address_utils/sockaddr_utils.h"
  26 #include "src/core/lib/channel/channel_args.h"
  27 #include "src/core/lib/iomgr/endpoint.h"
  28 #include "src/core/lib/iomgr/error.h"
  29 #include "src/core/lib/iomgr/event_engine/closure.h"
  30 #include "src/core/lib/iomgr/event_engine/pollset.h"
  31 #include "src/core/lib/iomgr/pollset.h"
  32 #include "src/core/lib/iomgr/pollset_set.h"
  33 #include "src/core/lib/iomgr/resource_quota.h"
  34 #include "src/core/lib/transport/error_utils.h"
  35
  36 extern grpc_core::TraceFlag grpc_tcp_trace;
  37
  38 namespace {
  39
  40 using ::grpc_event_engine::experimental::EventEngine;
  41 using ::grpc_event_engine::experimental::ResolvedAddressToURI;
  42 using ::grpc_event_engine::experimental::SliceBuffer;
  43
  44 void endpoint_read(grpc_endpoint* ep, grpc_slice_buffer* slices,
  45                    grpc_closure* cb, bool /* urgent */) {
  46   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
  47   if (eeep->endpoint == nullptr) {
  48     grpc_core::ExecCtx::Run(DEBUG_LOCATION, cb, GRPC_ERROR_CANCELLED);
  49     return;
  50   }
  51   SliceBuffer* read_buffer = new (&eeep->read_buffer) SliceBuffer(slices);
  52   eeep->endpoint->Read(
  53       [eeep, cb](absl::Status status) {
  54         auto* read_buffer = reinterpret_cast<SliceBuffer*>(&eeep->read_buffer);
  55         read_buffer->~SliceBuffer();
  56         grpc_core::ExecCtx exec_ctx;
  57         grpc_core::Closure::Run(DEBUG_LOCATION, cb,
  58                                 absl_status_to_grpc_error(status));
  59         exec_ctx.Flush();
  60         grpc_pollset_ee_broadcast_event();
  61       },
  62       read_buffer, absl::InfiniteFuture());
  63 }
  64
  65 void endpoint_write(grpc_endpoint* ep, grpc_slice_buffer* slices,
  66                     grpc_closure* cb, void* arg) {
  67   // TODO(hork): adapt arg to some metrics collection mechanism.
  68   (void)arg;
  69   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
  70   if (eeep->endpoint == nullptr) {
  71     grpc_core::ExecCtx::Run(DEBUG_LOCATION, cb, GRPC_ERROR_CANCELLED);
  72     return;
  73   }
  74   SliceBuffer* write_buffer = new (&eeep->write_buffer) SliceBuffer(slices);
  75   eeep->endpoint->Write(
  76       [eeep, cb](absl::Status status) {
  77         auto* write_buffer =
  78             reinterpret_cast<SliceBuffer*>(&eeep->write_buffer);
  79         write_buffer->~SliceBuffer();
  80         grpc_core::ExecCtx exec_ctx;
  81         grpc_core::Closure::Run(DEBUG_LOCATION, cb,
  82                                 absl_status_to_grpc_error(status));
  83         exec_ctx.Flush();
  84         grpc_pollset_ee_broadcast_event();
  85       },
  86       write_buffer, absl::InfiniteFuture());
  87 }
  88 void endpoint_add_to_pollset(grpc_endpoint* /* ep */,
  89                              grpc_pollset* /* pollset */) {}
  90 void endpoint_add_to_pollset_set(grpc_endpoint* /* ep */,
  91                                  grpc_pollset_set* /* pollset */) {}
  92 void endpoint_delete_from_pollset_set(grpc_endpoint* /* ep */,
  93                                       grpc_pollset_set* /* pollset */) {}
  94 /// After shutdown, all endpoint operations except destroy are no-op,
  95 /// and will return some kind of sane default (empty strings, nullptrs, etc). It
  96 /// is the caller's responsibility to ensure that calls to endpoint_shutdown are
  97 /// synchronized.
  98 void endpoint_shutdown(grpc_endpoint* ep, grpc_error* why) {
  99   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
 100   if (GRPC_TRACE_FLAG_ENABLED(grpc_tcp_trace)) {
 101     const char* str = grpc_error_string(why);
 102     gpr_log(GPR_INFO, "TCP Endpoint %p shutdown why=%s", eeep->endpoint.get(),
 103             str);
 104   }
 105   grpc_resource_user_shutdown(eeep->ru);
 106   eeep->endpoint.reset();
 107 }
 108
 109 void endpoint_destroy(grpc_endpoint* ep) {
 110   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
 111   grpc_resource_user_unref(eeep->ru);
 112   delete eeep;
 113 }
 114
 115 grpc_resource_user* endpoint_get_resource_user(grpc_endpoint* ep) {
 116   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
 117   return eeep->ru;
 118 }
 119
 120 absl::string_view endpoint_get_peer(grpc_endpoint* ep) {
 121   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
 122   if (eeep->endpoint == nullptr) {
 123     return "";
 124   }
 125   if (eeep->peer_address.empty()) {
 126     const EventEngine::ResolvedAddress* addr = eeep->endpoint->GetPeerAddress();
 127     GPR_ASSERT(addr != nullptr);
 128     eeep->peer_address = ResolvedAddressToURI(*addr);
 129   }
 130   return eeep->peer_address;
 131 }
 132
 133 absl::string_view endpoint_get_local_address(grpc_endpoint* ep) {
 134   auto* eeep = reinterpret_cast<grpc_event_engine_endpoint*>(ep);
 135   if (eeep->endpoint == nullptr) {
 136     return "";
 137   }
 138   if (eeep->local_address.empty()) {
 139     const EventEngine::ResolvedAddress* addr =
 140         eeep->endpoint->GetLocalAddress();
 141     GPR_ASSERT(addr != nullptr);
 142     eeep->local_address = ResolvedAddressToURI(*addr);
 143   }
 144   return eeep->local_address;
 145 }
 146
 147 int endpoint_get_fd(grpc_endpoint* /* ep */) { return -1; }
 148
 149 bool endpoint_can_track_err(grpc_endpoint* /* ep */) { return false; }
 150
 151 grpc_endpoint_vtable grpc_event_engine_endpoint_vtable = {
 152     endpoint_read,
 153     endpoint_write,
 154     endpoint_add_to_pollset,
 155     endpoint_add_to_pollset_set,
 156     endpoint_delete_from_pollset_set,
 157     endpoint_shutdown,
 158     endpoint_destroy,
 159     endpoint_get_resource_user,
 160     endpoint_get_peer,
 161     endpoint_get_local_address,
 162     endpoint_get_fd,
 163     endpoint_can_track_err};
 164
 165 }  // namespace
 166
 167 grpc_event_engine_endpoint* grpc_tcp_server_endpoint_create(
 168     std::unique_ptr<EventEngine::Endpoint> ee_endpoint) {
 169   auto endpoint = new grpc_event_engine_endpoint;
 170   endpoint->base.vtable = &grpc_event_engine_endpoint_vtable;
 171   // TODO(hork): populate endpoint->ru from the uvEngine's subclass
 172   endpoint->endpoint = std::move(ee_endpoint);
 173   return endpoint;
 174 }
 175
 176 grpc_endpoint* grpc_tcp_create(const grpc_channel_args* channel_args,
 177                                absl::string_view peer_address) {
 178   auto endpoint = new grpc_event_engine_endpoint;
 179   endpoint->base.vtable = &grpc_event_engine_endpoint_vtable;
 180   grpc_resource_quota* resource_quota =
 181       grpc_channel_args_find_pointer<grpc_resource_quota>(
 182           channel_args, GRPC_ARG_RESOURCE_QUOTA);
 183   if (resource_quota != nullptr) {
 184     grpc_resource_quota_ref_internal(resource_quota);
 185   } else {
 186     resource_quota = grpc_resource_quota_create(nullptr);
 187   }
 188   endpoint->ru = grpc_resource_user_create(resource_quota,
 189                                            std::string(peer_address).c_str());
 190   grpc_resource_quota_unref_internal(resource_quota);
 191   return &endpoint->base;
 192 }
 193
 194 #endif  // GRPC_USE_EVENT_ENGINE