/**
* collectd - src/grpc.cc
* Copyright (C) 2015-2016 Sebastian Harl
+ * Copyright (C) 2016 Florian octo Forster
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
*
* Authors:
* Sebastian Harl <sh at tokkee.org>
+ * Florian octo Forster <octo at collectd.org>
**/
#include <grpc++/grpc++.h>
#include <fstream>
#include <iostream>
+#include <queue>
#include <vector>
#include "collectd.grpc.pb.h"
#include "collectd.h"
#include "common.h"
-#include "configfile.h"
#include "plugin.h"
#include "daemon/utils_cache.h"
using collectd::Collectd;
-using collectd::DispatchValuesRequest;
-using collectd::DispatchValuesReply;
+using collectd::PutValuesRequest;
+using collectd::PutValuesResponse;
using collectd::QueryValuesRequest;
-using collectd::QueryValuesReply;
+using collectd::QueryValuesResponse;
using google::protobuf::util::TimeUtil;
msg->set_allocated_interval(new google::protobuf::Duration(d));
for (size_t i = 0; i < vl->values_len; ++i) {
- auto v = msg->add_value();
+ auto v = msg->add_values();
switch (ds->ds[i].type) {
case DS_TYPE_COUNTER:
v->set_counter(vl->values[i].counter);
return grpc::Status(grpc::StatusCode::INTERNAL,
grpc::string("unknown value type"));
}
+
+ auto name = msg->add_ds_names();
+ name->assign(ds->ds[i].name);
}
return grpc::Status::OK;
size_t values_len = 0;
status = grpc::Status::OK;
- for (auto v : msg.value()) {
+ for (auto v : msg.values()) {
value_t *val = (value_t *)realloc(values, (values_len + 1) * sizeof(*values));
if (!val) {
status = grpc::Status(grpc::StatusCode::RESOURCE_EXHAUSTED,
} /* unmarshal_value_list() */
/*
- * request call-backs and call objects
+ * Collectd service
*/
-
-static grpc::Status Process(grpc::ServerContext *ctx,
- DispatchValuesRequest request, DispatchValuesReply *reply)
-{
- value_list_t vl = VALUE_LIST_INIT;
- auto status = unmarshal_value_list(request.values(), &vl);
- if (!status.ok())
- return status;
-
- if (plugin_dispatch_values(&vl))
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to enqueue values for writing"));
- return status;
-} /* Process(): DispatchValues */
-
-static grpc::Status Process(grpc::ServerContext *ctx,
- QueryValuesRequest request, QueryValuesReply *reply)
-{
- uc_iter_t *iter;
- char *name = NULL;
-
- value_list_t matcher;
- auto status = unmarshal_ident(request.identifier(), &matcher, false);
- if (!status.ok())
- return status;
-
- if ((iter = uc_get_iterator()) == NULL) {
- return grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to query values: cannot create iterator"));
- }
-
- status = grpc::Status::OK;
- while (uc_iterator_next(iter, &name) == 0) {
- value_list_t res;
- if (parse_identifier_vl(name, &res) != 0) {
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to parse identifier"));
- break;
+class CollectdImpl : public collectd::Collectd::Service {
+public:
+ grpc::Status QueryValues(grpc::ServerContext *ctx, QueryValuesRequest const *req, grpc::ServerWriter<QueryValuesResponse> *writer) override {
+ value_list_t match;
+ auto status = unmarshal_ident(req->identifier(), &match, false);
+ if (!status.ok()) {
+ return status;
}
- if (!ident_matches(&res, &matcher))
- continue;
-
- if (uc_iterator_get_time(iter, &res.time) < 0) {
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to retrieve value timestamp"));
- break;
+ std::queue<value_list_t> value_lists;
+ status = this->queryValuesRead(&match, &value_lists);
+ if (status.ok()) {
+ status = this->queryValuesWrite(ctx, writer, &value_lists);
}
- if (uc_iterator_get_interval(iter, &res.interval) < 0) {
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to retrieve value interval"));
- break;
- }
- if (uc_iterator_get_values(iter, &res.values, &res.values_len) < 0) {
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to retrieve values"));
- break;
+
+ while (!value_lists.empty()) {
+ auto vl = value_lists.front();
+ value_lists.pop();
+ sfree(vl.values);
}
- auto vl = reply->add_values();
- status = marshal_value_list(&res, vl);
- free(res.values);
- if (!status.ok())
- break;
+ return status;
}
- uc_iterator_destroy(iter);
+ grpc::Status PutValues(grpc::ServerContext *ctx,
+ grpc::ServerReader<PutValuesRequest> *reader,
+ PutValuesResponse *res) override {
+ PutValuesRequest req;
- return status;
-} /* Process(): QueryValues */
-
-class Call
-{
-public:
- Call(Collectd::AsyncService *service, grpc::ServerCompletionQueue *cq)
- : service_(service), cq_(cq), status_(CREATE)
- { }
-
- virtual ~Call()
- { }
+ while (reader->Read(&req)) {
+ value_list_t vl = {0};
+ auto status = unmarshal_value_list(req.value_list(), &vl);
+ if (!status.ok())
+ return status;
- void Handle()
- {
- if (status_ == CREATE) {
- Create();
- status_ = PROCESS;
- }
- else if (status_ == PROCESS) {
- Process();
- status_ = FINISH;
- }
- else {
- GPR_ASSERT(status_ == FINISH);
- Finish();
+ if (plugin_dispatch_values(&vl))
+ return grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to enqueue values for writing"));
}
- } /* Handle() */
-
-protected:
- virtual void Create() = 0;
- virtual void Process() = 0;
- virtual void Finish() = 0;
- Collectd::AsyncService *service_;
- grpc::ServerCompletionQueue *cq_;
- grpc::ServerContext ctx_;
+ res->Clear();
+ return grpc::Status::OK;
+ }
private:
- enum CallStatus { CREATE, PROCESS, FINISH };
- CallStatus status_;
-}; /* class Call */
+ grpc::Status queryValuesRead(value_list_t const *match, std::queue<value_list_t> *value_lists) {
+ uc_iter_t *iter;
+ if ((iter = uc_get_iterator()) == NULL) {
+ return grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to query values: cannot create iterator"));
+ }
-template<typename RequestT, typename ReplyT>
-class RpcCall final : public Call
-{
- typedef void (Collectd::AsyncService::*CreatorT)(grpc::ServerContext *,
- RequestT *, grpc::ServerAsyncResponseWriter<ReplyT> *,
- grpc::CompletionQueue *, grpc::ServerCompletionQueue *, void *);
+ grpc::Status status = grpc::Status::OK;
+ char *name = NULL;
+ while (uc_iterator_next(iter, &name) == 0) {
+ value_list_t vl;
+ if (parse_identifier_vl(name, &vl) != 0) {
+ status = grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to parse identifier"));
+ break;
+ }
-public:
- RpcCall(Collectd::AsyncService *service,
- CreatorT creator, grpc::ServerCompletionQueue *cq)
- : Call(service, cq), creator_(creator), responder_(&ctx_)
- {
- Handle();
- } /* RpcCall() */
+ if (!ident_matches(&vl, match))
+ continue;
- virtual ~RpcCall()
- { }
+ if (uc_iterator_get_time(iter, &vl.time) < 0) {
+ status = grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to retrieve value timestamp"));
+ break;
+ }
+ if (uc_iterator_get_interval(iter, &vl.interval) < 0) {
+ status = grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to retrieve value interval"));
+ break;
+ }
+ if (uc_iterator_get_values(iter, &vl.values, &vl.values_len) < 0) {
+ status = grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to retrieve values"));
+ break;
+ }
-private:
- void Create()
- {
- (service_->*creator_)(&ctx_, &request_, &responder_, cq_, cq_, this);
- } /* Create() */
+ value_lists->push(vl);
+ } // while (uc_iterator_next(iter, &name) == 0)
- void Process()
- {
- // Add a new request object to the queue.
- new RpcCall<RequestT, ReplyT>(service_, creator_, cq_);
- grpc::Status status = ::Process(&ctx_, request_, &reply_);
- responder_.Finish(reply_, status, this);
- } /* Process() */
+ uc_iterator_destroy(iter);
+ return status;
+ }
- void Finish()
- {
- delete this;
- } /* Finish() */
+ grpc::Status queryValuesWrite(grpc::ServerContext *ctx,
+ grpc::ServerWriter<QueryValuesResponse> *writer,
+ std::queue<value_list_t> *value_lists) {
+ while (!value_lists->empty()) {
+ auto vl = value_lists->front();
+ QueryValuesResponse res;
+ res.Clear();
+
+ auto status = marshal_value_list(&vl, res.mutable_value_list());
+ if (!status.ok()) {
+ return status;
+ }
- CreatorT creator_;
+ if (!writer->Write(res)) {
+ return grpc::Status::CANCELLED;
+ }
- RequestT request_;
- ReplyT reply_;
+ value_lists->pop();
+ sfree(vl.values);
+ }
- grpc::ServerAsyncResponseWriter<ReplyT> responder_;
-}; /* class RpcCall */
+ return grpc::Status::OK;
+ }
+};
/*
* gRPC server implementation
*/
-
class CollectdServer final
{
public:
}
}
- builder.RegisterService(&service_);
- cq_ = builder.AddCompletionQueue();
+ builder.RegisterService(&collectd_service_);
+
server_ = builder.BuildAndStart();
} /* Start() */
void Shutdown()
{
server_->Shutdown();
- cq_->Shutdown();
} /* Shutdown() */
- void Mainloop()
- {
- // Register request types.
- new RpcCall<DispatchValuesRequest, DispatchValuesReply>(&service_,
- &Collectd::AsyncService::RequestDispatchValues, cq_.get());
- new RpcCall<QueryValuesRequest, QueryValuesReply>(&service_,
- &Collectd::AsyncService::RequestQueryValues, cq_.get());
-
- while (true) {
- void *req = NULL;
- bool ok = false;
-
- if (!cq_->Next(&req, &ok))
- break; // Queue shut down.
- if (!ok) {
- ERROR("grpc: Failed to read from queue");
- break;
- }
-
- static_cast<Call *>(req)->Handle();
- }
- } /* Mainloop() */
-
private:
- Collectd::AsyncService service_;
+ CollectdImpl collectd_service_;
std::unique_ptr<grpc::Server> server_;
- std::unique_ptr<grpc::ServerCompletionQueue> cq_;
}; /* class CollectdServer */
+class CollectdClient final
+{
+public:
+ CollectdClient(std::shared_ptr<grpc::ChannelInterface> channel) : stub_(Collectd::NewStub(channel)) {
+ }
+
+ int PutValues(value_list_t const *vl) {
+ grpc::ClientContext ctx;
+
+ PutValuesRequest req;
+ auto status = marshal_value_list(vl, req.mutable_value_list());
+ if (!status.ok()) {
+ ERROR("grpc: Marshalling value_list_t failed.");
+ return -1;
+ }
+
+ PutValuesResponse res;
+ auto stream = stub_->PutValues(&ctx, &res);
+ if (!stream->Write(req)) {
+ NOTICE("grpc: Broken stream.");
+ /* intentionally not returning. */
+ }
+
+ stream->WritesDone();
+ status = stream->Finish();
+ if (!status.ok()) {
+ ERROR ("grpc: Error while closing stream.");
+ return -1;
+ }
+
+ return 0;
+ } /* int PutValues */
+
+private:
+ std::unique_ptr<Collectd::Stub> stub_;
+};
+
static CollectdServer *server = nullptr;
/*
* collectd plugin interface
*/
-
extern "C" {
- static pthread_t *workers;
- static size_t workers_num = 5;
+ static void c_grpc_destroy_write_callback (void *ptr) {
+ delete (CollectdClient *) ptr;
+ }
- static void *worker_thread(void *arg)
- {
- CollectdServer *s = (CollectdServer *)arg;
- s->Mainloop();
- return NULL;
- } /* worker_thread() */
+ static int c_grpc_write(__attribute__((unused)) data_set_t const *ds,
+ value_list_t const *vl,
+ user_data_t *ud) {
+ CollectdClient *c = (CollectdClient *) ud->data;
+ return c->PutValues(vl);
+ }
static int c_grpc_config_listen(oconfig_item_t *ci)
{
return -1;
}
}
- else if (!strcasecmp("SSLRootCerts", child->key)) {
+ else if (!strcasecmp("SSLCACertificateFile", child->key)) {
char *certs = NULL;
if (cf_util_get_string(child, &certs)) {
ERROR("grpc: Option `%s` expects a string value",
}
ssl_opts->pem_root_certs = read_file(certs);
}
- else if (!strcasecmp("SSLServerKey", child->key)) {
+ else if (!strcasecmp("SSLCertificateKeyFile", child->key)) {
char *key = NULL;
if (cf_util_get_string(child, &key)) {
ERROR("grpc: Option `%s` expects a string value",
}
pkcp.private_key = read_file(key);
}
- else if (!strcasecmp("SSLServerCert", child->key)) {
+ else if (!strcasecmp("SSLCertificateFile", child->key)) {
char *cert = NULL;
if (cf_util_get_string(child, &cert)) {
ERROR("grpc: Option `%s` expects a string value",
return 0;
} /* c_grpc_config_listen() */
+ static int c_grpc_config_server(oconfig_item_t *ci)
+ {
+ if ((ci->values_num != 2)
+ || (ci->values[0].type != OCONFIG_TYPE_STRING)
+ || (ci->values[1].type != OCONFIG_TYPE_STRING)) {
+ ERROR("grpc: The `%s` config option needs exactly "
+ "two string argument (address and port).", ci->key);
+ return -1;
+ }
+
+ grpc::SslCredentialsOptions ssl_opts;
+ bool use_ssl = false;
+
+ for (int i = 0; i < ci->children_num; i++) {
+ oconfig_item_t *child = ci->children + i;
+
+ if (!strcasecmp("EnableSSL", child->key)) {
+ if (cf_util_get_boolean(child, &use_ssl)) {
+ return -1;
+ }
+ }
+ else if (!strcasecmp("SSLCACertificateFile", child->key)) {
+ char *certs = NULL;
+ if (cf_util_get_string(child, &certs)) {
+ return -1;
+ }
+ ssl_opts.pem_root_certs = read_file(certs);
+ }
+ else if (!strcasecmp("SSLCertificateKeyFile", child->key)) {
+ char *key = NULL;
+ if (cf_util_get_string(child, &key)) {
+ return -1;
+ }
+ ssl_opts.pem_private_key = read_file(key);
+ }
+ else if (!strcasecmp("SSLCertificateFile", child->key)) {
+ char *cert = NULL;
+ if (cf_util_get_string(child, &cert)) {
+ return -1;
+ }
+ ssl_opts.pem_cert_chain = read_file(cert);
+ }
+ else {
+ WARNING("grpc: Option `%s` not allowed in <%s> block.",
+ child->key, ci->key);
+ }
+ }
+
+ auto node = grpc::string(ci->values[0].value.string);
+ auto service = grpc::string(ci->values[1].value.string);
+ auto addr = node + ":" + service;
+
+ CollectdClient *client;
+ if (use_ssl) {
+ auto channel_creds = grpc::SslCredentials(ssl_opts);
+ auto channel = grpc::CreateChannel(addr, channel_creds);
+ client = new CollectdClient(channel);
+ } else {
+ auto channel = grpc::CreateChannel(addr, grpc::InsecureChannelCredentials());
+ client = new CollectdClient(channel);
+ }
+
+ auto callback_name = grpc::string("grpc/") + addr;
+ user_data_t ud = {
+ .data = client,
+ .free_func = c_grpc_destroy_write_callback,
+ };
+
+ plugin_register_write (callback_name.c_str(), c_grpc_write, &ud);
+ return 0;
+ } /* c_grpc_config_server() */
+
static int c_grpc_config(oconfig_item_t *ci)
{
int i;
if (c_grpc_config_listen(child))
return -1;
}
- else if (!strcasecmp("WorkerThreads", child->key)) {
- int n;
- if (cf_util_get_int(child, &n))
+ else if (!strcasecmp("Server", child->key)) {
+ if (c_grpc_config_server(child))
return -1;
- workers_num = (size_t)n;
}
+
else {
WARNING("grpc: Option `%s` not allowed here.", child->key);
}
static int c_grpc_init(void)
{
server = new CollectdServer();
- size_t i;
-
- if (! server) {
+ if (!server) {
ERROR("grpc: Failed to create server");
return -1;
}
- workers = (pthread_t *)calloc(workers_num, sizeof(*workers));
- if (! workers) {
- delete server;
- server = nullptr;
-
- ERROR("grpc: Failed to allocate worker threads");
- return -1;
- }
-
server->Start();
- for (i = 0; i < workers_num; i++) {
- plugin_thread_create(&workers[i], /* attr = */ NULL,
- worker_thread, server);
- }
- INFO("grpc: Started %zu workers", workers_num);
return 0;
} /* c_grpc_init() */
static int c_grpc_shutdown(void)
{
- size_t i;
-
if (!server)
- return -1;
+ return 0;
server->Shutdown();
- INFO("grpc: Waiting for %zu workers to terminate", workers_num);
- for (i = 0; i < workers_num; i++)
- pthread_join(workers[i], NULL);
- free(workers);
- workers = NULL;
- workers_num = 0;
-
delete server;
server = nullptr;
projects / collectd.git / blobdiff