src/core/lib/channel/channelz.cc

   1 /*
   2  *
   3  * Copyright 2017 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <grpc/impl/codegen/port_platform.h>
  20
  21 #include "src/core/lib/channel/channelz.h"
  22
  23 #include <grpc/grpc.h>
  24 #include <grpc/support/alloc.h>
  25 #include <grpc/support/log.h>
  26 #include <grpc/support/string_util.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "src/core/lib/channel/channelz_registry.h"
  32 #include "src/core/lib/channel/status_util.h"
  33 #include "src/core/lib/gpr/string.h"
  34 #include "src/core/lib/gpr/useful.h"
  35 #include "src/core/lib/gprpp/atomic.h"
  36 #include "src/core/lib/gprpp/host_port.h"
  37 #include "src/core/lib/gprpp/memory.h"
  38 #include "src/core/lib/iomgr/error.h"
  39 #include "src/core/lib/iomgr/exec_ctx.h"
  40 #include "src/core/lib/slice/b64.h"
  41 #include "src/core/lib/slice/slice_internal.h"
  42 #include "src/core/lib/surface/channel.h"
  43 #include "src/core/lib/surface/server.h"
  44 #include "src/core/lib/transport/connectivity_state.h"
  45 #include "src/core/lib/transport/error_utils.h"
  46 #include "src/core/lib/uri/uri_parser.h"
  47
  48 namespace grpc_core {
  49 namespace channelz {
  50
  51 //
  52 // channel arg code
  53 //
  54
  55 namespace {
  56
  57 void* parent_uuid_copy(void* p) { return p; }
  58 void parent_uuid_destroy(void* /*p*/) {}
  59 int parent_uuid_cmp(void* p1, void* p2) { return GPR_ICMP(p1, p2); }
  60 const grpc_arg_pointer_vtable parent_uuid_vtable = {
  61     parent_uuid_copy, parent_uuid_destroy, parent_uuid_cmp};
  62
  63 }  // namespace
  64
  65 grpc_arg MakeParentUuidArg(intptr_t parent_uuid) {
  66   // We would ideally like to store the uuid in an integer argument.
  67   // Unfortunately, that won't work, because intptr_t (the type used for
  68   // uuids) doesn't fit in an int (the type used for integer args).
  69   // So instead, we use a hack to store it as a pointer, because
  70   // intptr_t should be the same size as void*.
  71   static_assert(sizeof(intptr_t) <= sizeof(void*),
  72                 "can't fit intptr_t inside of void*");
  73   return grpc_channel_arg_pointer_create(
  74       const_cast<char*>(GRPC_ARG_CHANNELZ_PARENT_UUID),
  75       reinterpret_cast<void*>(parent_uuid), &parent_uuid_vtable);
  76 }
  77
  78 intptr_t GetParentUuidFromArgs(const grpc_channel_args& args) {
  79   const grpc_arg* arg =
  80       grpc_channel_args_find(&args, GRPC_ARG_CHANNELZ_PARENT_UUID);
  81   if (arg == nullptr || arg->type != GRPC_ARG_POINTER) return 0;
  82   return reinterpret_cast<intptr_t>(arg->value.pointer.p);
  83 }
  84
  85 //
  86 // BaseNode
  87 //
  88
  89 BaseNode::BaseNode(EntityType type, std::string name)
  90     : type_(type), uuid_(-1), name_(std::move(name)) {
  91   // The registry will set uuid_ under its lock.
  92   ChannelzRegistry::Register(this);
  93 }
  94
  95 BaseNode::~BaseNode() { ChannelzRegistry::Unregister(uuid_); }
  96
  97 std::string BaseNode::RenderJsonString() {
  98   Json json = RenderJson();
  99   return json.Dump();
 100 }
 101
 102 //
 103 // CallCountingHelper
 104 //
 105
 106 CallCountingHelper::CallCountingHelper() {
 107   num_cores_ = GPR_MAX(1, gpr_cpu_num_cores());
 108   per_cpu_counter_data_storage_.reserve(num_cores_);
 109   for (size_t i = 0; i < num_cores_; ++i) {
 110     per_cpu_counter_data_storage_.emplace_back();
 111   }
 112 }
 113
 114 void CallCountingHelper::RecordCallStarted() {
 115   AtomicCounterData& data =
 116       per_cpu_counter_data_storage_[ExecCtx::Get()->starting_cpu()];
 117   data.calls_started.FetchAdd(1, MemoryOrder::RELAXED);
 118   data.last_call_started_cycle.Store(gpr_get_cycle_counter(),
 119                                      MemoryOrder::RELAXED);
 120 }
 121
 122 void CallCountingHelper::RecordCallFailed() {
 123   per_cpu_counter_data_storage_[ExecCtx::Get()->starting_cpu()]
 124       .calls_failed.FetchAdd(1, MemoryOrder::RELAXED);
 125 }
 126
 127 void CallCountingHelper::RecordCallSucceeded() {
 128   per_cpu_counter_data_storage_[ExecCtx::Get()->starting_cpu()]
 129       .calls_succeeded.FetchAdd(1, MemoryOrder::RELAXED);
 130 }
 131
 132 void CallCountingHelper::CollectData(CounterData* out) {
 133   for (size_t core = 0; core < num_cores_; ++core) {
 134     AtomicCounterData& data = per_cpu_counter_data_storage_[core];
 135
 136     out->calls_started += data.calls_started.Load(MemoryOrder::RELAXED);
 137     out->calls_succeeded +=
 138         per_cpu_counter_data_storage_[core].calls_succeeded.Load(
 139             MemoryOrder::RELAXED);
 140     out->calls_failed += per_cpu_counter_data_storage_[core].calls_failed.Load(
 141         MemoryOrder::RELAXED);
 142     const gpr_cycle_counter last_call =
 143         per_cpu_counter_data_storage_[core].last_call_started_cycle.Load(
 144             MemoryOrder::RELAXED);
 145     if (last_call > out->last_call_started_cycle) {
 146       out->last_call_started_cycle = last_call;
 147     }
 148   }
 149 }
 150
 151 void CallCountingHelper::PopulateCallCounts(Json::Object* object) {
 152   CounterData data;
 153   CollectData(&data);
 154   if (data.calls_started != 0) {
 155     (*object)["callsStarted"] = std::to_string(data.calls_started);
 156     gpr_timespec ts = gpr_convert_clock_type(
 157         gpr_cycle_counter_to_time(data.last_call_started_cycle),
 158         GPR_CLOCK_REALTIME);
 159     (*object)["lastCallStartedTimestamp"] = gpr_format_timespec(ts);
 160   }
 161   if (data.calls_succeeded != 0) {
 162     (*object)["callsSucceeded"] = std::to_string(data.calls_succeeded);
 163   }
 164   if (data.calls_failed) {
 165     (*object)["callsFailed"] = std::to_string(data.calls_failed);
 166   }
 167 }
 168
 169 //
 170 // ChannelNode
 171 //
 172
 173 ChannelNode::ChannelNode(std::string target, size_t channel_tracer_max_nodes,
 174                          intptr_t parent_uuid)
 175     : BaseNode(parent_uuid == 0 ? EntityType::kTopLevelChannel
 176                                 : EntityType::kInternalChannel,
 177                target),
 178       target_(std::move(target)),
 179       trace_(channel_tracer_max_nodes),
 180       parent_uuid_(parent_uuid) {}
 181
 182 const char* ChannelNode::GetChannelConnectivityStateChangeString(
 183     grpc_connectivity_state state) {
 184   switch (state) {
 185     case GRPC_CHANNEL_IDLE:
 186       return "Channel state change to IDLE";
 187     case GRPC_CHANNEL_CONNECTING:
 188       return "Channel state change to CONNECTING";
 189     case GRPC_CHANNEL_READY:
 190       return "Channel state change to READY";
 191     case GRPC_CHANNEL_TRANSIENT_FAILURE:
 192       return "Channel state change to TRANSIENT_FAILURE";
 193     case GRPC_CHANNEL_SHUTDOWN:
 194       return "Channel state change to SHUTDOWN";
 195   }
 196   GPR_UNREACHABLE_CODE(return "UNKNOWN");
 197 }
 198
 199 Json ChannelNode::RenderJson() {
 200   Json::Object data = {
 201       {"target", target_},
 202   };
 203   // Connectivity state.
 204   // If low-order bit is on, then the field is set.
 205   int state_field = connectivity_state_.Load(MemoryOrder::RELAXED);
 206   if ((state_field & 1) != 0) {
 207     grpc_connectivity_state state =
 208         static_cast<grpc_connectivity_state>(state_field >> 1);
 209     data["state"] = Json::Object{
 210         {"state", ConnectivityStateName(state)},
 211     };
 212   }
 213   // Fill in the channel trace if applicable.
 214   Json trace_json = trace_.RenderJson();
 215   if (trace_json.type() != Json::Type::JSON_NULL) {
 216     data["trace"] = std::move(trace_json);
 217   }
 218   // Ask CallCountingHelper to populate call count data.
 219   call_counter_.PopulateCallCounts(&data);
 220   // Construct outer object.
 221   Json::Object json = {
 222       {"ref",
 223        Json::Object{
 224            {"channelId", std::to_string(uuid())},
 225        }},
 226       {"data", std::move(data)},
 227   };
 228   // Template method. Child classes may override this to add their specific
 229   // functionality.
 230   PopulateChildRefs(&json);
 231   return json;
 232 }
 233
 234 void ChannelNode::PopulateChildRefs(Json::Object* json) {
 235   MutexLock lock(&child_mu_);
 236   if (!child_subchannels_.empty()) {
 237     Json::Array array;
 238     for (const auto& p : child_subchannels_) {
 239       array.emplace_back(Json::Object{
 240           {"subchannelId", std::to_string(p.first)},
 241       });
 242     }
 243     (*json)["subchannelRef"] = std::move(array);
 244   }
 245   if (!child_channels_.empty()) {
 246     Json::Array array;
 247     for (const auto& p : child_channels_) {
 248       array.emplace_back(Json::Object{
 249           {"channelId", std::to_string(p.first)},
 250       });
 251     }
 252     (*json)["channelRef"] = std::move(array);
 253   }
 254 }
 255
 256 void ChannelNode::SetConnectivityState(grpc_connectivity_state state) {
 257   // Store with low-order bit set to indicate that the field is set.
 258   int state_field = (state << 1) + 1;
 259   connectivity_state_.Store(state_field, MemoryOrder::RELAXED);
 260 }
 261
 262 void ChannelNode::AddChildChannel(intptr_t child_uuid) {
 263   MutexLock lock(&child_mu_);
 264   child_channels_.insert(std::make_pair(child_uuid, true));
 265 }
 266
 267 void ChannelNode::RemoveChildChannel(intptr_t child_uuid) {
 268   MutexLock lock(&child_mu_);
 269   child_channels_.erase(child_uuid);
 270 }
 271
 272 void ChannelNode::AddChildSubchannel(intptr_t child_uuid) {
 273   MutexLock lock(&child_mu_);
 274   child_subchannels_.insert(std::make_pair(child_uuid, true));
 275 }
 276
 277 void ChannelNode::RemoveChildSubchannel(intptr_t child_uuid) {
 278   MutexLock lock(&child_mu_);
 279   child_subchannels_.erase(child_uuid);
 280 }
 281
 282 //
 283 // ServerNode
 284 //
 285
 286 ServerNode::ServerNode(size_t channel_tracer_max_nodes)
 287     : BaseNode(EntityType::kServer, ""), trace_(channel_tracer_max_nodes) {}
 288
 289 ServerNode::~ServerNode() {}
 290
 291 void ServerNode::AddChildSocket(RefCountedPtr<SocketNode> node) {
 292   MutexLock lock(&child_mu_);
 293   child_sockets_.insert(std::make_pair(node->uuid(), std::move(node)));
 294 }
 295
 296 void ServerNode::RemoveChildSocket(intptr_t child_uuid) {
 297   MutexLock lock(&child_mu_);
 298   child_sockets_.erase(child_uuid);
 299 }
 300
 301 void ServerNode::AddChildListenSocket(RefCountedPtr<ListenSocketNode> node) {
 302   MutexLock lock(&child_mu_);
 303   child_listen_sockets_.insert(std::make_pair(node->uuid(), std::move(node)));
 304 }
 305
 306 void ServerNode::RemoveChildListenSocket(intptr_t child_uuid) {
 307   MutexLock lock(&child_mu_);
 308   child_listen_sockets_.erase(child_uuid);
 309 }
 310
 311 std::string ServerNode::RenderServerSockets(intptr_t start_socket_id,
 312                                             intptr_t max_results) {
 313   GPR_ASSERT(start_socket_id >= 0);
 314   GPR_ASSERT(max_results >= 0);
 315   // If user does not set max_results, we choose 500.
 316   size_t pagination_limit = max_results == 0 ? 500 : max_results;
 317   Json::Object object;
 318   {
 319     MutexLock lock(&child_mu_);
 320     size_t sockets_rendered = 0;
 321     // Create list of socket refs.
 322     Json::Array array;
 323     auto it = child_sockets_.lower_bound(start_socket_id);
 324     for (; it != child_sockets_.end() && sockets_rendered < pagination_limit;
 325          ++it, ++sockets_rendered) {
 326       array.emplace_back(Json::Object{
 327           {"socketId", std::to_string(it->first)},
 328           {"name", it->second->name()},
 329       });
 330     }
 331     object["socketRef"] = std::move(array);
 332     if (it == child_sockets_.end()) object["end"] = true;
 333   }
 334   Json json = std::move(object);
 335   return json.Dump();
 336 }
 337
 338 Json ServerNode::RenderJson() {
 339   Json::Object data;
 340   // Fill in the channel trace if applicable.
 341   Json trace_json = trace_.RenderJson();
 342   if (trace_json.type() != Json::Type::JSON_NULL) {
 343     data["trace"] = std::move(trace_json);
 344   }
 345   // Ask CallCountingHelper to populate call count data.
 346   call_counter_.PopulateCallCounts(&data);
 347   // Construct top-level object.
 348   Json::Object object = {
 349       {"ref",
 350        Json::Object{
 351            {"serverId", std::to_string(uuid())},
 352        }},
 353       {"data", std::move(data)},
 354   };
 355   // Render listen sockets.
 356   {
 357     MutexLock lock(&child_mu_);
 358     if (!child_listen_sockets_.empty()) {
 359       Json::Array array;
 360       for (const auto& it : child_listen_sockets_) {
 361         array.emplace_back(Json::Object{
 362             {"socketId", std::to_string(it.first)},
 363             {"name", it.second->name()},
 364         });
 365       }
 366       object["listenSocket"] = std::move(array);
 367     }
 368   }
 369   return object;
 370 }
 371
 372 //
 373 // SocketNode
 374 //
 375
 376 namespace {
 377
 378 void PopulateSocketAddressJson(Json::Object* json, const char* name,
 379                                const char* addr_str) {
 380   if (addr_str == nullptr) return;
 381   Json::Object data;
 382   grpc_uri* uri = grpc_uri_parse(addr_str, true);
 383   if ((uri != nullptr) && ((strcmp(uri->scheme, "ipv4") == 0) ||
 384                            (strcmp(uri->scheme, "ipv6") == 0))) {
 385     const char* host_port = uri->path;
 386     if (*host_port == '/') ++host_port;
 387     std::string host;
 388     std::string port;
 389     GPR_ASSERT(SplitHostPort(host_port, &host, &port));
 390     int port_num = -1;
 391     if (!port.empty()) {
 392       port_num = atoi(port.data());
 393     }
 394     char* b64_host = grpc_base64_encode(host.data(), host.size(), false, false);
 395     data["tcpip_address"] = Json::Object{
 396         {"port", port_num},
 397         {"ip_address", b64_host},
 398     };
 399     gpr_free(b64_host);
 400   } else if (uri != nullptr && strcmp(uri->scheme, "unix") == 0) {
 401     data["uds_address"] = Json::Object{
 402         {"filename", uri->path},
 403     };
 404   } else {
 405     data["other_address"] = Json::Object{
 406         {"name", addr_str},
 407     };
 408   }
 409   grpc_uri_destroy(uri);
 410   (*json)[name] = std::move(data);
 411 }
 412
 413 }  // namespace
 414
 415 SocketNode::SocketNode(std::string local, std::string remote, std::string name)
 416     : BaseNode(EntityType::kSocket, std::move(name)),
 417       local_(std::move(local)),
 418       remote_(std::move(remote)) {}
 419
 420 void SocketNode::RecordStreamStartedFromLocal() {
 421   streams_started_.FetchAdd(1, MemoryOrder::RELAXED);
 422   last_local_stream_created_cycle_.Store(gpr_get_cycle_counter(),
 423                                          MemoryOrder::RELAXED);
 424 }
 425
 426 void SocketNode::RecordStreamStartedFromRemote() {
 427   streams_started_.FetchAdd(1, MemoryOrder::RELAXED);
 428   last_remote_stream_created_cycle_.Store(gpr_get_cycle_counter(),
 429                                           MemoryOrder::RELAXED);
 430 }
 431
 432 void SocketNode::RecordMessagesSent(uint32_t num_sent) {
 433   messages_sent_.FetchAdd(num_sent, MemoryOrder::RELAXED);
 434   last_message_sent_cycle_.Store(gpr_get_cycle_counter(), MemoryOrder::RELAXED);
 435 }
 436
 437 void SocketNode::RecordMessageReceived() {
 438   messages_received_.FetchAdd(1, MemoryOrder::RELAXED);
 439   last_message_received_cycle_.Store(gpr_get_cycle_counter(),
 440                                      MemoryOrder::RELAXED);
 441 }
 442
 443 Json SocketNode::RenderJson() {
 444   // Create and fill the data child.
 445   Json::Object data;
 446   gpr_timespec ts;
 447   int64_t streams_started = streams_started_.Load(MemoryOrder::RELAXED);
 448   if (streams_started != 0) {
 449     data["streamsStarted"] = std::to_string(streams_started);
 450     gpr_cycle_counter last_local_stream_created_cycle =
 451         last_local_stream_created_cycle_.Load(MemoryOrder::RELAXED);
 452     if (last_local_stream_created_cycle != 0) {
 453       ts = gpr_convert_clock_type(
 454           gpr_cycle_counter_to_time(last_local_stream_created_cycle),
 455           GPR_CLOCK_REALTIME);
 456       data["lastLocalStreamCreatedTimestamp"] = gpr_format_timespec(ts);
 457     }
 458     gpr_cycle_counter last_remote_stream_created_cycle =
 459         last_remote_stream_created_cycle_.Load(MemoryOrder::RELAXED);
 460     if (last_remote_stream_created_cycle != 0) {
 461       ts = gpr_convert_clock_type(
 462           gpr_cycle_counter_to_time(last_remote_stream_created_cycle),
 463           GPR_CLOCK_REALTIME);
 464       data["lastRemoteStreamCreatedTimestamp"] = gpr_format_timespec(ts);
 465     }
 466   }
 467   int64_t streams_succeeded = streams_succeeded_.Load(MemoryOrder::RELAXED);
 468   if (streams_succeeded != 0) {
 469     data["streamsSucceeded"] = std::to_string(streams_succeeded);
 470   }
 471   int64_t streams_failed = streams_failed_.Load(MemoryOrder::RELAXED);
 472   if (streams_failed != 0) {
 473     data["streamsFailed"] = std::to_string(streams_failed);
 474   }
 475   int64_t messages_sent = messages_sent_.Load(MemoryOrder::RELAXED);
 476   if (messages_sent != 0) {
 477     data["messagesSent"] = std::to_string(messages_sent);
 478     ts = gpr_convert_clock_type(
 479         gpr_cycle_counter_to_time(
 480             last_message_sent_cycle_.Load(MemoryOrder::RELAXED)),
 481         GPR_CLOCK_REALTIME);
 482     data["lastMessageSentTimestamp"] = gpr_format_timespec(ts);
 483   }
 484   int64_t messages_received = messages_received_.Load(MemoryOrder::RELAXED);
 485   if (messages_received != 0) {
 486     data["messagesReceived"] = std::to_string(messages_received);
 487     ts = gpr_convert_clock_type(
 488         gpr_cycle_counter_to_time(
 489             last_message_received_cycle_.Load(MemoryOrder::RELAXED)),
 490         GPR_CLOCK_REALTIME);
 491     data["lastMessageReceivedTimestamp"] = gpr_format_timespec(ts);
 492   }
 493   int64_t keepalives_sent = keepalives_sent_.Load(MemoryOrder::RELAXED);
 494   if (keepalives_sent != 0) {
 495     data["keepAlivesSent"] = std::to_string(keepalives_sent);
 496   }
 497   // Create and fill the parent object.
 498   Json::Object object = {
 499       {"ref",
 500        Json::Object{
 501            {"socketId", std::to_string(uuid())},
 502            {"name", name()},
 503        }},
 504       {"data", std::move(data)},
 505   };
 506   PopulateSocketAddressJson(&object, "remote", remote_.c_str());
 507   PopulateSocketAddressJson(&object, "local", local_.c_str());
 508   return object;
 509 }
 510
 511 //
 512 // ListenSocketNode
 513 //
 514
 515 ListenSocketNode::ListenSocketNode(std::string local_addr, std::string name)
 516     : BaseNode(EntityType::kSocket, std::move(name)),
 517       local_addr_(std::move(local_addr)) {}
 518
 519 Json ListenSocketNode::RenderJson() {
 520   Json::Object object = {
 521       {"ref",
 522        Json::Object{
 523            {"socketId", std::to_string(uuid())},
 524            {"name", name()},
 525        }},
 526   };
 527   PopulateSocketAddressJson(&object, "local", local_addr_.c_str());
 528   return object;
 529 }
 530
 531 }  // namespace channelz
 532 }  // namespace grpc_core