src/grpc.cc

   1 /**
   2  * collectd - src/grpc.cc
   3  * Copyright (C) 2015-2016 Sebastian Harl
   4  * Copyright (C) 2016      Florian octo Forster
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *   Sebastian Harl <sh at tokkee.org>
  26  *   Florian octo Forster <octo at collectd.org>
  27  **/
  28
  29 #include <grpc++/grpc++.h>
  30 #include <google/protobuf/util/time_util.h>
  31
  32 #include <fstream>
  33 #include <iostream>
  34 #include <queue>
  35 #include <vector>
  36
  37 #include "collectd.grpc.pb.h"
  38
  39 extern "C" {
  40 #include <fnmatch.h>
  41 #include <stdbool.h>
  42
  43 #include "collectd.h"
  44 #include "common.h"
  45 #include "plugin.h"
  46
  47 #include "daemon/utils_cache.h"
  48 }
  49
  50 using collectd::Collectd;
  51
  52 using collectd::PutValuesRequest;
  53 using collectd::PutValuesResponse;
  54 using collectd::QueryValuesRequest;
  55 using collectd::QueryValuesResponse;
  56
  57 using google::protobuf::util::TimeUtil;
  58
  59 /*
  60  * private types
  61  */
  62
  63 struct Listener {
  64         grpc::string addr;
  65         grpc::string port;
  66
  67         grpc::SslServerCredentialsOptions *ssl;
  68 };
  69 static std::vector<Listener> listeners;
  70 static grpc::string default_addr("0.0.0.0:50051");
  71
  72 /*
  73  * helper functions
  74  */
  75
  76 static bool ident_matches(const value_list_t *vl, const value_list_t *matcher)
  77 {
  78         if (fnmatch(matcher->host, vl->host, 0))
  79                 return false;
  80
  81         if (fnmatch(matcher->plugin, vl->plugin, 0))
  82                 return false;
  83         if (fnmatch(matcher->plugin_instance, vl->plugin_instance, 0))
  84                 return false;
  85
  86         if (fnmatch(matcher->type, vl->type, 0))
  87                 return false;
  88         if (fnmatch(matcher->type_instance, vl->type_instance, 0))
  89                 return false;
  90
  91         return true;
  92 } /* ident_matches */
  93
  94 static grpc::string read_file(const char *filename)
  95 {
  96         std::ifstream f;
  97         grpc::string s, content;
  98
  99         f.open(filename);
 100         if (!f.is_open()) {
 101                 ERROR("grpc: Failed to open '%s'", filename);
 102                 return "";
 103         }
 104
 105         while (std::getline(f, s)) {
 106                 content += s;
 107                 content.push_back('\n');
 108         }
 109         f.close();
 110         return content;
 111 } /* read_file */
 112
 113 /*
 114  * proto conversion
 115  */
 116
 117 static void marshal_ident(const value_list_t *vl, collectd::types::Identifier *msg)
 118 {
 119         msg->set_host(vl->host);
 120         msg->set_plugin(vl->plugin);
 121         if (vl->plugin_instance[0] != '\0')
 122                 msg->set_plugin_instance(vl->plugin_instance);
 123         msg->set_type(vl->type);
 124         if (vl->type_instance[0] != '\0')
 125                 msg->set_type_instance(vl->type_instance);
 126 } /* marshal_ident */
 127
 128 static grpc::Status unmarshal_ident(const collectd::types::Identifier &msg, value_list_t *vl,
 129                 bool require_fields)
 130 {
 131         std::string s;
 132
 133         s = msg.host();
 134         if (!s.length() && require_fields)
 135                 return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 136                                 grpc::string("missing host name"));
 137         sstrncpy(vl->host, s.c_str(), sizeof(vl->host));
 138
 139         s = msg.plugin();
 140         if (!s.length() && require_fields)
 141                 return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 142                                 grpc::string("missing plugin name"));
 143         sstrncpy(vl->plugin, s.c_str(), sizeof(vl->plugin));
 144
 145         s = msg.type();
 146         if (!s.length() && require_fields)
 147                 return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 148                                 grpc::string("missing type name"));
 149         sstrncpy(vl->type, s.c_str(), sizeof(vl->type));
 150
 151         s = msg.plugin_instance();
 152         sstrncpy(vl->plugin_instance, s.c_str(), sizeof(vl->plugin_instance));
 153
 154         s = msg.type_instance();
 155         sstrncpy(vl->type_instance, s.c_str(), sizeof(vl->type_instance));
 156
 157         return grpc::Status::OK;
 158 } /* unmarshal_ident() */
 159
 160 static grpc::Status marshal_value_list(const value_list_t *vl, collectd::types::ValueList *msg)
 161 {
 162         auto id = msg->mutable_identifier();
 163         marshal_ident(vl, id);
 164
 165         auto ds = plugin_get_ds(vl->type);
 166         if ((ds == NULL) || (ds->ds_num != vl->values_len)) {
 167                 return grpc::Status(grpc::StatusCode::INTERNAL,
 168                                 grpc::string("failed to retrieve data-set for values"));
 169         }
 170
 171         auto t = TimeUtil::NanosecondsToTimestamp(CDTIME_T_TO_NS(vl->time));
 172         auto d = TimeUtil::NanosecondsToDuration(CDTIME_T_TO_NS(vl->interval));
 173         msg->set_allocated_time(new google::protobuf::Timestamp(t));
 174         msg->set_allocated_interval(new google::protobuf::Duration(d));
 175
 176         for (size_t i = 0; i < vl->values_len; ++i) {
 177                 auto v = msg->add_values();
 178                 switch (ds->ds[i].type) {
 179                         case DS_TYPE_COUNTER:
 180                                 v->set_counter(vl->values[i].counter);
 181                                 break;
 182                         case DS_TYPE_GAUGE:
 183                                 v->set_gauge(vl->values[i].gauge);
 184                                 break;
 185                         case DS_TYPE_DERIVE:
 186                                 v->set_derive(vl->values[i].derive);
 187                                 break;
 188                         case DS_TYPE_ABSOLUTE:
 189                                 v->set_absolute(vl->values[i].absolute);
 190                                 break;
 191                         default:
 192                                 return grpc::Status(grpc::StatusCode::INTERNAL,
 193                                                 grpc::string("unknown value type"));
 194                 }
 195
 196                 auto name = msg->add_ds_names();
 197                 name->assign(ds->ds[i].name);
 198         }
 199
 200         return grpc::Status::OK;
 201 } /* marshal_value_list */
 202
 203 static grpc::Status unmarshal_value_list(const collectd::types::ValueList &msg, value_list_t *vl)
 204 {
 205         vl->time = NS_TO_CDTIME_T(TimeUtil::TimestampToNanoseconds(msg.time()));
 206         vl->interval = NS_TO_CDTIME_T(TimeUtil::DurationToNanoseconds(msg.interval()));
 207
 208         auto status = unmarshal_ident(msg.identifier(), vl, true);
 209         if (!status.ok())
 210                 return status;
 211
 212         value_t *values = NULL;
 213         size_t values_len = 0;
 214
 215         status = grpc::Status::OK;
 216         for (auto v : msg.values()) {
 217                 value_t *val = (value_t *)realloc(values, (values_len + 1) * sizeof(*values));
 218                 if (!val) {
 219                         status = grpc::Status(grpc::StatusCode::RESOURCE_EXHAUSTED,
 220                                         grpc::string("failed to allocate values array"));
 221                         break;
 222                 }
 223
 224                 values = val;
 225                 val = values + values_len;
 226                 values_len++;
 227
 228                 switch (v.value_case()) {
 229                 case collectd::types::Value::ValueCase::kCounter:
 230                         val->counter = counter_t(v.counter());
 231                         break;
 232                 case collectd::types::Value::ValueCase::kGauge:
 233                         val->gauge = gauge_t(v.gauge());
 234                         break;
 235                 case collectd::types::Value::ValueCase::kDerive:
 236                         val->derive = derive_t(v.derive());
 237                         break;
 238                 case collectd::types::Value::ValueCase::kAbsolute:
 239                         val->absolute = absolute_t(v.absolute());
 240                         break;
 241                 default:
 242                         status = grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 243                                         grpc::string("unknown value type"));
 244                         break;
 245                 }
 246
 247                 if (!status.ok())
 248                         break;
 249         }
 250         if (status.ok()) {
 251                 vl->values = values;
 252                 vl->values_len = values_len;
 253         }
 254         else if (values) {
 255                 free(values);
 256         }
 257
 258         return status;
 259 } /* unmarshal_value_list() */
 260
 261 /*
 262  * Collectd service
 263  */
 264 class CollectdImpl : public collectd::Collectd::Service {
 265 public:
 266         grpc::Status QueryValues(grpc::ServerContext *ctx, QueryValuesRequest const *req, grpc::ServerWriter<QueryValuesResponse> *writer) override {
 267                 value_list_t match;
 268                 auto status = unmarshal_ident(req->identifier(), &match, false);
 269                 if (!status.ok()) {
 270                         return status;
 271                 }
 272
 273                 std::queue<value_list_t> value_lists;
 274                 status = this->queryValuesRead(&match, &value_lists);
 275                 if (status.ok()) {
 276                         status = this->queryValuesWrite(ctx, writer, &value_lists);
 277                 }
 278
 279                 while (!value_lists.empty()) {
 280                         auto vl = value_lists.front();
 281                         value_lists.pop();
 282                         sfree(vl.values);
 283                 }
 284
 285                 return status;
 286         }
 287
 288         grpc::Status PutValues(grpc::ServerContext *ctx,
 289                                                    grpc::ServerReader<PutValuesRequest> *reader,
 290                                                    PutValuesResponse *res) override {
 291                 PutValuesRequest req;
 292
 293                 while (reader->Read(&req)) {
 294                         value_list_t vl = {0};
 295                         auto status = unmarshal_value_list(req.value_list(), &vl);
 296                         if (!status.ok())
 297                                 return status;
 298
 299                         if (plugin_dispatch_values(&vl))
 300                                 return grpc::Status(grpc::StatusCode::INTERNAL,
 301                                                                         grpc::string("failed to enqueue values for writing"));
 302                 }
 303
 304                 res->Clear();
 305                 return grpc::Status::OK;
 306         }
 307
 308 private:
 309         grpc::Status queryValuesRead(value_list_t const *match, std::queue<value_list_t> *value_lists) {
 310                 uc_iter_t *iter;
 311                 if ((iter = uc_get_iterator()) == NULL) {
 312                         return grpc::Status(grpc::StatusCode::INTERNAL,
 313                                                                 grpc::string("failed to query values: cannot create iterator"));
 314                 }
 315
 316                 grpc::Status status = grpc::Status::OK;
 317                 char *name = NULL;
 318                 while (uc_iterator_next(iter, &name) == 0) {
 319                         value_list_t vl;
 320                         if (parse_identifier_vl(name, &vl) != 0) {
 321                                 status = grpc::Status(grpc::StatusCode::INTERNAL,
 322                                                                           grpc::string("failed to parse identifier"));
 323                                 break;
 324                         }
 325
 326                         if (!ident_matches(&vl, match))
 327                                 continue;
 328
 329                         if (uc_iterator_get_time(iter, &vl.time) < 0) {
 330                                 status = grpc::Status(grpc::StatusCode::INTERNAL,
 331                                                                           grpc::string("failed to retrieve value timestamp"));
 332                                 break;
 333                         }
 334                         if (uc_iterator_get_interval(iter, &vl.interval) < 0) {
 335                                 status = grpc::Status(grpc::StatusCode::INTERNAL,
 336                                                                           grpc::string("failed to retrieve value interval"));
 337                                 break;
 338                         }
 339                         if (uc_iterator_get_values(iter, &vl.values, &vl.values_len) < 0) {
 340                                 status = grpc::Status(grpc::StatusCode::INTERNAL,
 341                                                                           grpc::string("failed to retrieve values"));
 342                                 break;
 343                         }
 344
 345                         value_lists->push(vl);
 346                 } // while (uc_iterator_next(iter, &name) == 0)
 347
 348                 uc_iterator_destroy(iter);
 349                 return status;
 350         }
 351
 352         grpc::Status queryValuesWrite(grpc::ServerContext *ctx,
 353                                            grpc::ServerWriter<QueryValuesResponse> *writer,
 354                                            std::queue<value_list_t> *value_lists) {
 355                 while (!value_lists->empty()) {
 356                         auto vl = value_lists->front();
 357                         QueryValuesResponse res;
 358                         res.Clear();
 359
 360                         auto status = marshal_value_list(&vl, res.mutable_value_list());
 361                         if (!status.ok()) {
 362                                 return status;
 363                         }
 364
 365                         if (!writer->Write(res)) {
 366                                 return grpc::Status::CANCELLED;
 367                         }
 368
 369                         value_lists->pop();
 370                         sfree(vl.values);
 371                 }
 372
 373                 return grpc::Status::OK;
 374         }
 375 };
 376
 377 /*
 378  * gRPC server implementation
 379  */
 380 class CollectdServer final
 381 {
 382 public:
 383         void Start()
 384         {
 385                 auto auth = grpc::InsecureServerCredentials();
 386
 387                 grpc::ServerBuilder builder;
 388
 389                 if (listeners.empty()) {
 390                         builder.AddListeningPort(default_addr, auth);
 391                         INFO("grpc: Listening on %s", default_addr.c_str());
 392                 }
 393                 else {
 394                         for (auto l : listeners) {
 395                                 grpc::string addr = l.addr + ":" + l.port;
 396
 397                                 auto use_ssl = grpc::string("");
 398                                 auto a = auth;
 399                                 if (l.ssl != nullptr) {
 400                                         use_ssl = grpc::string(" (SSL enabled)");
 401                                         a = grpc::SslServerCredentials(*l.ssl);
 402                                 }
 403
 404                                 builder.AddListeningPort(addr, a);
 405                                 INFO("grpc: Listening on %s%s", addr.c_str(), use_ssl.c_str());
 406                         }
 407                 }
 408
 409                 builder.RegisterService(&collectd_service_);
 410
 411                 server_ = builder.BuildAndStart();
 412         } /* Start() */
 413
 414         void Shutdown()
 415         {
 416                 server_->Shutdown();
 417         } /* Shutdown() */
 418
 419 private:
 420         CollectdImpl collectd_service_;
 421
 422         std::unique_ptr<grpc::Server> server_;
 423 }; /* class CollectdServer */
 424
 425 class CollectdClient final
 426 {
 427 public:
 428         CollectdClient(std::shared_ptr<grpc::ChannelInterface> channel) : stub_(Collectd::NewStub(channel)) {
 429         }
 430
 431         int PutValues(value_list_t const *vl) {
 432                 grpc::ClientContext ctx;
 433
 434                 PutValuesRequest req;
 435                 auto status = marshal_value_list(vl, req.mutable_value_list());
 436                 if (!status.ok()) {
 437                         ERROR("grpc: Marshalling value_list_t failed.");
 438                         return -1;
 439                 }
 440
 441                 PutValuesResponse res;
 442                 auto stream = stub_->PutValues(&ctx, &res);
 443                 if (!stream->Write(req)) {
 444                         NOTICE("grpc: Broken stream.");
 445                         /* intentionally not returning. */
 446                 }
 447
 448                 stream->WritesDone();
 449                 status = stream->Finish();
 450                 if (!status.ok()) {
 451                         ERROR ("grpc: Error while closing stream.");
 452                         return -1;
 453                 }
 454
 455                 return 0;
 456         } /* int PutValues */
 457
 458 private:
 459         std::unique_ptr<Collectd::Stub> stub_;
 460 };
 461
 462 static CollectdServer *server = nullptr;
 463
 464 /*
 465  * collectd plugin interface
 466  */
 467 extern "C" {
 468         static void c_grpc_destroy_write_callback (void *ptr) {
 469                 delete (CollectdClient *) ptr;
 470         }
 471
 472         static int c_grpc_write(__attribute__((unused)) data_set_t const *ds,
 473                         value_list_t const *vl,
 474                         user_data_t *ud) {
 475                 CollectdClient *c = (CollectdClient *) ud->data;
 476                 return c->PutValues(vl);
 477         }
 478
 479         static int c_grpc_config_listen(oconfig_item_t *ci)
 480         {
 481                 if ((ci->values_num != 2)
 482                                 || (ci->values[0].type != OCONFIG_TYPE_STRING)
 483                                 || (ci->values[1].type != OCONFIG_TYPE_STRING)) {
 484                         ERROR("grpc: The `%s` config option needs exactly "
 485                                         "two string argument (address and port).", ci->key);
 486                         return -1;
 487                 }
 488
 489                 auto listener = Listener();
 490                 listener.addr = grpc::string(ci->values[0].value.string);
 491                 listener.port = grpc::string(ci->values[1].value.string);
 492                 listener.ssl = nullptr;
 493
 494                 auto ssl_opts = new(grpc::SslServerCredentialsOptions);
 495                 grpc::SslServerCredentialsOptions::PemKeyCertPair pkcp = {};
 496                 bool use_ssl = false;
 497
 498                 for (int i = 0; i < ci->children_num; i++) {
 499                         oconfig_item_t *child = ci->children + i;
 500
 501                         if (!strcasecmp("EnableSSL", child->key)) {
 502                                 if (cf_util_get_boolean(child, &use_ssl)) {
 503                                         ERROR("grpc: Option `%s` expects a boolean value",
 504                                                         child->key);
 505                                         return -1;
 506                                 }
 507                         }
 508                         else if (!strcasecmp("SSLCACertificateFile", child->key)) {
 509                                 char *certs = NULL;
 510                                 if (cf_util_get_string(child, &certs)) {
 511                                         ERROR("grpc: Option `%s` expects a string value",
 512                                                         child->key);
 513                                         return -1;
 514                                 }
 515                                 ssl_opts->pem_root_certs = read_file(certs);
 516                         }
 517                         else if (!strcasecmp("SSLCertificateKeyFile", child->key)) {
 518                                 char *key = NULL;
 519                                 if (cf_util_get_string(child, &key)) {
 520                                         ERROR("grpc: Option `%s` expects a string value",
 521                                                         child->key);
 522                                         return -1;
 523                                 }
 524                                 pkcp.private_key = read_file(key);
 525                         }
 526                         else if (!strcasecmp("SSLCertificateFile", child->key)) {
 527                                 char *cert = NULL;
 528                                 if (cf_util_get_string(child, &cert)) {
 529                                         ERROR("grpc: Option `%s` expects a string value",
 530                                                         child->key);
 531                                         return -1;
 532                                 }
 533                                 pkcp.cert_chain = read_file(cert);
 534                         }
 535                         else {
 536                                 WARNING("grpc: Option `%s` not allowed in <%s> block.",
 537                                                 child->key, ci->key);
 538                         }
 539                 }
 540
 541                 ssl_opts->pem_key_cert_pairs.push_back(pkcp);
 542                 if (use_ssl)
 543                         listener.ssl = ssl_opts;
 544                 else
 545                         delete(ssl_opts);
 546
 547                 listeners.push_back(listener);
 548                 return 0;
 549         } /* c_grpc_config_listen() */
 550
 551         static int c_grpc_config_server(oconfig_item_t *ci)
 552         {
 553                 if ((ci->values_num != 2)
 554                                 || (ci->values[0].type != OCONFIG_TYPE_STRING)
 555                                 || (ci->values[1].type != OCONFIG_TYPE_STRING)) {
 556                         ERROR("grpc: The `%s` config option needs exactly "
 557                                         "two string argument (address and port).", ci->key);
 558                         return -1;
 559                 }
 560
 561                 grpc::SslCredentialsOptions ssl_opts;
 562                 bool use_ssl = false;
 563
 564                 for (int i = 0; i < ci->children_num; i++) {
 565                         oconfig_item_t *child = ci->children + i;
 566
 567                         if (!strcasecmp("EnableSSL", child->key)) {
 568                                 if (cf_util_get_boolean(child, &use_ssl)) {
 569                                         return -1;
 570                                 }
 571                         }
 572                         else if (!strcasecmp("SSLCACertificateFile", child->key)) {
 573                                 char *certs = NULL;
 574                                 if (cf_util_get_string(child, &certs)) {
 575                                         return -1;
 576                                 }
 577                                 ssl_opts.pem_root_certs = read_file(certs);
 578                         }
 579                         else if (!strcasecmp("SSLCertificateKeyFile", child->key)) {
 580                                 char *key = NULL;
 581                                 if (cf_util_get_string(child, &key)) {
 582                                         return -1;
 583                                 }
 584                                 ssl_opts.pem_private_key = read_file(key);
 585                         }
 586                         else if (!strcasecmp("SSLCertificateFile", child->key)) {
 587                                 char *cert = NULL;
 588                                 if (cf_util_get_string(child, &cert)) {
 589                                         return -1;
 590                                 }
 591                                 ssl_opts.pem_cert_chain = read_file(cert);
 592                         }
 593                         else {
 594                                 WARNING("grpc: Option `%s` not allowed in <%s> block.",
 595                                                 child->key, ci->key);
 596                         }
 597                 }
 598
 599                 auto node    = grpc::string(ci->values[0].value.string);
 600                 auto service = grpc::string(ci->values[1].value.string);
 601                 auto addr    = node + ":" + service;
 602
 603                 CollectdClient *client;
 604                 if (use_ssl) {
 605                         auto channel_creds = grpc::SslCredentials(ssl_opts);
 606                         auto channel = grpc::CreateChannel(addr, channel_creds);
 607                         client = new CollectdClient(channel);
 608                 } else {
 609                         auto channel = grpc::CreateChannel(addr, grpc::InsecureChannelCredentials());
 610                         client = new CollectdClient(channel);
 611                 }
 612
 613                 auto callback_name = grpc::string("grpc/") + addr;
 614                 user_data_t ud = {
 615                         .data = client,
 616                         .free_func = c_grpc_destroy_write_callback,
 617                 };
 618
 619                 plugin_register_write (callback_name.c_str(), c_grpc_write, &ud);
 620                 return 0;
 621         } /* c_grpc_config_server() */
 622
 623         static int c_grpc_config(oconfig_item_t *ci)
 624         {
 625                 int i;
 626
 627                 for (i = 0; i < ci->children_num; i++) {
 628                         oconfig_item_t *child = ci->children + i;
 629
 630                         if (!strcasecmp("Listen", child->key)) {
 631                                 if (c_grpc_config_listen(child))
 632                                         return -1;
 633                         }
 634                         else if (!strcasecmp("Server", child->key)) {
 635                                 if (c_grpc_config_server(child))
 636                                         return -1;
 637                         }
 638
 639                         else {
 640                                 WARNING("grpc: Option `%s` not allowed here.", child->key);
 641                         }
 642                 }
 643
 644                 return 0;
 645         } /* c_grpc_config() */
 646
 647         static int c_grpc_init(void)
 648         {
 649                 server = new CollectdServer();
 650                 if (!server) {
 651                         ERROR("grpc: Failed to create server");
 652                         return -1;
 653                 }
 654
 655                 server->Start();
 656                 return 0;
 657         } /* c_grpc_init() */
 658
 659         static int c_grpc_shutdown(void)
 660         {
 661                 if (!server)
 662                         return 0;
 663
 664                 server->Shutdown();
 665
 666                 delete server;
 667                 server = nullptr;
 668
 669                 return 0;
 670         } /* c_grpc_shutdown() */
 671
 672         void module_register(void)
 673         {
 674                 plugin_register_complex_config("grpc", c_grpc_config);
 675                 plugin_register_init("grpc", c_grpc_init);
 676                 plugin_register_shutdown("grpc", c_grpc_shutdown);
 677         } /* module_register() */
 678 } /* extern "C" */
 679
 680 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */