X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=src%2Fgrpc.cc;h=ca3314ecf10cf743828d076c79b4e2217968fc91;hb=d26dd5c1db5c3310c9e69b2b910c6547469c99ce;hp=9523fc2513dd2cf6804a2fdec8ab2029bbeb04c8;hpb=1faf439320a1a875cbbd44179aec6641d0b7854b;p=collectd.git

diff --git a/src/grpc.cc b/src/grpc.cc
index 9523fc25..ca3314ec 100644
--- a/src/grpc.cc
+++ b/src/grpc.cc
@@ -1,6 +1,6 @@
 /**
  * collectd - src/grpc.cc
- * Copyright (C) 2015 Sebastian Harl
+ * Copyright (C) 2015-2016 Sebastian Harl
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -27,70 +27,192 @@
 #include <grpc++/grpc++.h>
 #include <google/protobuf/util/time_util.h>
 
+#include <fstream>
+#include <iostream>
+#include <vector>
+
 #include "collectd.grpc.pb.h"
 
 extern "C" {
+#include <fnmatch.h>
 #include <stdbool.h>
-#include <pthread.h>
 
 #include "collectd.h"
 #include "common.h"
 #include "configfile.h"
 #include "plugin.h"
 
-	typedef struct {
-		char *addr;
-		char *port;
-	} listener_t;
-
-	static listener_t *listeners;
-	static size_t listeners_num;
+#include "daemon/utils_cache.h"
 }
 
+using collectd::Collectd;
+using collectd::Dispatch;
+
+using collectd::DispatchValuesRequest;
+using collectd::DispatchValuesReply;
+using collectd::QueryValuesRequest;
+using collectd::QueryValuesReply;
+
 using google::protobuf::util::TimeUtil;
 
 /*
- * proto conversion
+ * private types
  */
 
-static grpc::Status unmarshal_value_list(const collectd::types::ValueList &msg, value_list_t *vl)
+struct Listener {
+	grpc::string addr;
+	grpc::string port;
+
+	grpc::SslServerCredentialsOptions *ssl;
+};
+static std::vector<Listener> listeners;
+static grpc::string default_addr("0.0.0.0:50051");
+
+/*
+ * helper functions
+ */
+
+static bool ident_matches(const value_list_t *vl, const value_list_t *matcher)
 {
-	vl->time = NS_TO_CDTIME_T(TimeUtil::TimestampToNanoseconds(msg.time()));
-	vl->interval = NS_TO_CDTIME_T(TimeUtil::DurationToNanoseconds(msg.interval()));
+	if (fnmatch(matcher->host, vl->host, 0))
+		return false;
+
+	if (fnmatch(matcher->plugin, vl->plugin, 0))
+		return false;
+	if (fnmatch(matcher->plugin_instance, vl->plugin_instance, 0))
+		return false;
+
+	if (fnmatch(matcher->type, vl->type, 0))
+		return false;
+	if (fnmatch(matcher->type_instance, vl->type_instance, 0))
+		return false;
 
+	return true;
+} /* ident_matches */
+
+static grpc::string read_file(const char *filename)
+{
+	std::ifstream f;
+	grpc::string s, content;
+
+	f.open(filename);
+	if (!f.is_open()) {
+		ERROR("grpc: Failed to open '%s'", filename);
+		return "";
+	}
+
+	while (std::getline(f, s)) {
+		content += s;
+		content.push_back('\n');
+	}
+	f.close();
+	return content;
+} /* read_file */
+
+/*
+ * proto conversion
+ */
+
+static void marshal_ident(const value_list_t *vl, collectd::types::Identifier *msg)
+{
+	msg->set_host(vl->host);
+	msg->set_plugin(vl->plugin);
+	if (vl->plugin_instance[0] != '\0')
+		msg->set_plugin_instance(vl->plugin_instance);
+	msg->set_type(vl->type);
+	if (vl->type_instance[0] != '\0')
+		msg->set_type_instance(vl->type_instance);
+} /* marshal_ident */
+
+static grpc::Status unmarshal_ident(const collectd::types::Identifier &msg, value_list_t *vl,
+		bool require_fields)
+{
 	std::string s;
 
 	s = msg.host();
-	if (!s.length())
+	if (!s.length() && require_fields)
 		return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 				grpc::string("missing host name"));
 	sstrncpy(vl->host, s.c_str(), sizeof(vl->host));
 
 	s = msg.plugin();
-	if (!s.length())
+	if (!s.length() && require_fields)
 		return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 				grpc::string("missing plugin name"));
 	sstrncpy(vl->plugin, s.c_str(), sizeof(vl->plugin));
 
 	s = msg.type();
-	if (!s.length())
+	if (!s.length() && require_fields)
 		return grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
 				grpc::string("missing type name"));
 	sstrncpy(vl->type, s.c_str(), sizeof(vl->type));
 
 	s = msg.plugin_instance();
-	if (s.length())
-		sstrncpy(vl->plugin_instance, s.c_str(), sizeof(vl->plugin_instance));
+	sstrncpy(vl->plugin_instance, s.c_str(), sizeof(vl->plugin_instance));
 
 	s = msg.type_instance();
-	if (s.length())
-		sstrncpy(vl->type_instance, s.c_str(), sizeof(vl->type_instance));
+	sstrncpy(vl->type_instance, s.c_str(), sizeof(vl->type_instance));
+
+	return grpc::Status::OK;
+} /* unmarshal_ident() */
+
+static grpc::Status marshal_value_list(const value_list_t *vl, collectd::types::ValueList *msg)
+{
+	auto id = msg->mutable_identifier();
+	marshal_ident(vl, id);
+
+	auto ds = plugin_get_ds(vl->type);
+	if ((ds == NULL) || (ds->ds_num != vl->values_len)) {
+		return grpc::Status(grpc::StatusCode::INTERNAL,
+				grpc::string("failed to retrieve data-set for values"));
+	}
+
+	auto t = TimeUtil::NanosecondsToTimestamp(CDTIME_T_TO_NS(vl->time));
+	auto d = TimeUtil::NanosecondsToDuration(CDTIME_T_TO_NS(vl->interval));
+	msg->set_allocated_time(new google::protobuf::Timestamp(t));
+	msg->set_allocated_interval(new google::protobuf::Duration(d));
+
+	for (size_t i = 0; i < vl->values_len; ++i) {
+		auto v = msg->add_values();
+		switch (ds->ds[i].type) {
+			case DS_TYPE_COUNTER:
+				v->set_counter(vl->values[i].counter);
+				break;
+			case DS_TYPE_GAUGE:
+				v->set_gauge(vl->values[i].gauge);
+				break;
+			case DS_TYPE_DERIVE:
+				v->set_derive(vl->values[i].derive);
+				break;
+			case DS_TYPE_ABSOLUTE:
+				v->set_absolute(vl->values[i].absolute);
+				break;
+			default:
+				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;
+} /* marshal_value_list */
+
+static grpc::Status unmarshal_value_list(const collectd::types::ValueList &msg, value_list_t *vl)
+{
+	vl->time = NS_TO_CDTIME_T(TimeUtil::TimestampToNanoseconds(msg.time()));
+	vl->interval = NS_TO_CDTIME_T(TimeUtil::DurationToNanoseconds(msg.interval()));
+
+	auto status = unmarshal_ident(msg.identifier(), vl, true);
+	if (!status.ok())
+		return status;
 
 	value_t *values = NULL;
 	size_t values_len = 0;
-	auto status = grpc::Status::OK;
 
-	for (auto v : msg.value()) {
+	status = grpc::Status::OK;
+	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,
@@ -117,7 +239,7 @@ static grpc::Status unmarshal_value_list(const collectd::types::ValueList &msg,
 			break;
 		default:
 			status = grpc::Status(grpc::StatusCode::INVALID_ARGUMENT,
-					grpc::string("unkown value type"));
+					grpc::string("unknown value type"));
 			break;
 		}
 
@@ -136,130 +258,231 @@ static grpc::Status unmarshal_value_list(const collectd::types::ValueList &msg,
 } /* unmarshal_value_list() */
 
 /*
- * request call objects
+ * request call-backs and call objects
  */
+static grpc::Status DispatchValue(grpc::ServerContext *ctx, DispatchValuesRequest request, DispatchValuesReply *reply)
+{
+	value_list_t vl = VALUE_LIST_INIT;
+	auto status = unmarshal_value_list(request.value_list(), &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"));
 
-class Call
+	reply->Clear();
+	return status;
+} /* grpc::Status DispatchValue */
+
+static grpc::Status QueryValues(grpc::ServerContext *ctx, QueryValuesRequest req, QueryValuesReply *res)
 {
-public:
-	Call(collectd::Collectd::AsyncService *service, grpc::ServerCompletionQueue *cq)
-		: service_(service), cq_(cq), status_(CREATE)
-	{ }
+	uc_iter_t *iter;
+	char *name = NULL;
 
-	virtual ~Call()
-	{ }
+	value_list_t matcher;
+	auto status = unmarshal_ident(req.identifier(), &matcher, false);
+	if (!status.ok())
+		return status;
 
-	void Handle()
-	{
-		if (status_ == CREATE) {
-			Create();
-			status_ = PROCESS;
+	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 vl;
+		if (parse_identifier_vl(name, &vl) != 0) {
+			status = grpc::Status(grpc::StatusCode::INTERNAL,
+					grpc::string("failed to parse identifier"));
+			break;
+		}
+
+		if (!ident_matches(&vl, &matcher))
+			continue;
+
+		if (uc_iterator_get_time(iter, &vl.time) < 0) {
+			status = grpc::Status(grpc::StatusCode::INTERNAL,
+					grpc::string("failed to retrieve value timestamp"));
+			break;
 		}
-		else if (status_ == PROCESS) {
-			Process();
-			status_ = FINISH;
+		if (uc_iterator_get_interval(iter, &vl.interval) < 0) {
+			status = grpc::Status(grpc::StatusCode::INTERNAL,
+					grpc::string("failed to retrieve value interval"));
+			break;
 		}
-		else {
-			GPR_ASSERT(status_ == FINISH);
-			Finish();
+		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;
 		}
-	} /* Handle() */
 
-protected:
-	virtual void Create() = 0;
-	virtual void Process() = 0;
-	virtual void Finish() = 0;
+		auto pb_vl = res->add_value_lists();
+		status = marshal_value_list(&vl, pb_vl);
+		free(vl.values);
+		if (!status.ok())
+			break;
+	}
 
-	collectd::Collectd::AsyncService *service_;
-	grpc::ServerCompletionQueue *cq_;
-	grpc::ServerContext ctx_;
+	uc_iterator_destroy(iter);
 
-private:
-	enum CallStatus { CREATE, PROCESS, FINISH };
-	CallStatus status_;
-}; /* class Call */
+	return status;
+} /* grpc::Status QueryValues */
 
-class DispatchValuesCall : public Call
-{
+// CallData is the abstract base class for asynchronous calls.
+class CallData {
 public:
-	DispatchValuesCall(collectd::Collectd::AsyncService *service, grpc::ServerCompletionQueue *cq)
-		: Call(service, cq), responder_(&ctx_)
-	{
-		Handle();
-	} /* DispatchValuesCall() */
+  virtual ~CallData() {}
+  virtual void process(bool ok) = 0;
 
-	virtual ~DispatchValuesCall()
-	{ }
+protected:
+  CallData() {}
 
 private:
-	void Create()
-	{
-		service_->RequestDispatchValues(&ctx_, &request_, &responder_, cq_, cq_, this);
-	} /* Create() */
+  CallData(const CallData&) = delete;
+  CallData& operator=(const CallData&) = delete;
+};
 
-	void Process()
-	{
-		// Add a new request object to the queue.
-		new DispatchValuesCall(service_, cq_);
-
-		value_list_t vl = VALUE_LIST_INIT;
-		auto status = unmarshal_value_list(request_.values(), &vl);
-		if (!status.ok()) {
-			responder_.Finish(reply_, status, this);
-			return;
-		}
+/*
+ * Collectd service
+ */
+// QueryValuesCallData holds the state and implements the logic for QueryValues calls.
+class QueryValuesCallData : public CallData {
+public:
+	QueryValuesCallData(Collectd::AsyncService* service, grpc::ServerCompletionQueue* cq)
+			: cq_(cq), service_(service), writer_(&context_) {
+		// As part of the initialization, we *request* that the system start
+		// processing QueryValues requests. In this request, "this" acts as
+		// the tag uniquely identifying the request (so that different
+		// QueryValuesCallData instances can serve different requests
+		// concurrently), in this case the memory address of this
+		// QueryValuesCallData instance.
+		service->RequestQueryValues(&context_, &request_, &writer_, cq_, cq_, this);
+	}
 
-		if (plugin_dispatch_values(&vl))
-			status = grpc::Status(grpc::StatusCode::INTERNAL,
-					grpc::string("failed to enqueue values for writing"));
+	void process(bool ok) final {
+		if (done_) {
+			delete this;
+		} else {
+			// Spawn a new QueryValuesCallData instance to serve new clients
+			// while we process the one for this QueryValuesCallData. The
+			// instance will deallocate itself as part of its FINISH state.
+			new QueryValuesCallData(service_, cq_);
+
+			auto status = QueryValues(&context_, request_, &response_);
+			if (!status.ok()) {
+				writer_.FinishWithError(status, this);
+			} else {
+				writer_.Finish(response_, grpc::Status::OK, this);
+			}
 
-		responder_.Finish(reply_, status, this);
-	} /* Process() */
+			done_ = true;
+		}
+	}
 
-	void Finish()
-	{
-		delete this;
-	} /* Finish() */
+private:
+	bool done_ = false;
+	grpc::ServerContext context_;
+	grpc::ServerCompletionQueue* cq_;
+	Collectd::AsyncService* service_;
+	QueryValuesRequest request_;
+	QueryValuesReply response_;
+	grpc::ServerAsyncResponseWriter<QueryValuesReply> writer_;
+};
 
-	collectd::DispatchValuesRequest request_;
-	collectd::DispatchValuesReply reply_;
+/*
+ * Dispatch service
+ */
+// DispatchValuesCallData holds the state and implements the logic for DispatchValues calls.
+class DispatchValuesCallData : public CallData {
+public:
+	DispatchValuesCallData(Dispatch::AsyncService* service, grpc::ServerCompletionQueue* cq)
+			: cq_(cq), service_(service), reader_(&context_) {
+		process(true);
+	}
+
+	void process(bool ok) final {
+		if (status == Status::INIT) {
+			service_->RequestDispatchValues(&context_, &reader_, cq_, cq_, this);
+			status = Status::CALL;
+		} else if (status == Status::CALL) {
+			reader_.Read(&request_, this);
+			status = Status::READ;
+		} else if (status == Status::READ && ok) {
+			(void) DispatchValue(&context_, request_, &response_);
+
+			reader_.Read(&request_, this);
+		} else if (status == Status::READ) {
+			response_.Clear();
+
+			status = Status::DONE;
+		} else if (status == Status::DONE) {
+			new DispatchValuesCallData(service_, cq_);
+			delete this;
+		} else {
+			ERROR("grpc: DispatchValuesCallData: invalid state");
+		}
+	}
 
-	grpc::ServerAsyncResponseWriter<collectd::DispatchValuesReply> responder_;
+private:
+	enum class Status {
+		INIT,
+		CALL,
+		READ,
+		DONE,
+	};
+	Status status = Status::INIT;
+
+	grpc::ServerContext          context_;
+	grpc::ServerCompletionQueue* cq_;
+	Dispatch::AsyncService*      service_;
+
+	DispatchValuesRequest request_;
+	DispatchValuesReply response_;
+	grpc::ServerAsyncReader<DispatchValuesReply, DispatchValuesRequest> reader_;
 };
 
 /*
  * gRPC server implementation
  */
-
 class CollectdServer final
 {
 public:
 	void Start()
 	{
-		// TODO: make configurable
 		auto auth = grpc::InsecureServerCredentials();
 
 		grpc::ServerBuilder builder;
 
-		if (!listeners_num) {
-			std::string default_addr("0.0.0.0:50051");
+		if (listeners.empty()) {
 			builder.AddListeningPort(default_addr, auth);
 			INFO("grpc: Listening on %s", default_addr.c_str());
 		}
 		else {
-			size_t i;
-			for (i = 0; i < listeners_num; i++) {
-				auto l = listeners[i];
-				std::string addr(l.addr);
-				addr += std::string(":") + std::string(l.port);
-				builder.AddListeningPort(addr, auth);
-				INFO("grpc: Listening on %s", addr.c_str());
+			for (auto l : listeners) {
+				grpc::string addr = l.addr + ":" + l.port;
+
+				auto use_ssl = grpc::string("");
+				auto a = auth;
+				if (l.ssl != nullptr) {
+					use_ssl = grpc::string(" (SSL enabled)");
+					a = grpc::SslServerCredentials(*l.ssl);
+				}
+
+				builder.AddListeningPort(addr, a);
+				INFO("grpc: Listening on %s%s", addr.c_str(), use_ssl.c_str());
 			}
 		}
 
-		builder.RegisterAsyncService(&service_);
 		cq_ = builder.AddCompletionQueue();
+
+		builder.RegisterService(&collectd_service_);
+		builder.RegisterService(&dispatch_service_);
+
 		server_ = builder.BuildAndStart();
+		new QueryValuesCallData(&collectd_service_, cq_.get());
+		new DispatchValuesCallData(&dispatch_service_, cq_.get());
 	} /* Start() */
 
 	void Shutdown()
@@ -270,26 +493,23 @@ public:
 
 	void Mainloop()
 	{
-		// Register request types.
-		new DispatchValuesCall(&service_, cq_.get());
-
 		while (true) {
-			void *req = NULL;
+			void *tag = NULL;
 			bool ok = false;
 
-			if (!cq_->Next(&req, &ok))
+			// Block waiting to read the next event from the completion queue.
+			// The event is uniquely identified by its tag, which in this case
+			// is the memory address of a CallData instance.
+			if (!cq_->Next(&tag, &ok))
 				break; // Queue shut down.
-			if (!ok) {
-				ERROR("grpc: Failed to read from queue");
-				break;
-			}
 
-			static_cast<Call *>(req)->Handle();
+			static_cast<CallData*>(tag)->process(ok);
 		}
 	} /* Mainloop() */
 
 private:
-	collectd::Collectd::AsyncService service_;
+	Collectd::AsyncService collectd_service_;
+	Dispatch::AsyncService dispatch_service_;
 
 	std::unique_ptr<grpc::Server> server_;
 	std::unique_ptr<grpc::ServerCompletionQueue> cq_;
@@ -300,7 +520,6 @@ static CollectdServer *server = nullptr;
 /*
  * collectd plugin interface
  */
-
 extern "C" {
 	static pthread_t *workers;
 	static size_t workers_num = 5;
@@ -314,9 +533,6 @@ extern "C" {
 
 	static int c_grpc_config_listen(oconfig_item_t *ci)
 	{
-		listener_t *listener;
-		int i;
-
 		if ((ci->values_num != 2)
 				|| (ci->values[0].type != OCONFIG_TYPE_STRING)
 				|| (ci->values[1].type != OCONFIG_TYPE_STRING)) {
@@ -325,25 +541,65 @@ extern "C" {
 			return -1;
 		}
 
-		listener = (listener_t *)realloc(listeners,
-				(listeners_num + 1) * sizeof(*listeners));
-		if (!listener) {
-			ERROR("grpc: Failed to allocate listeners");
-			return -1;
-		}
-		listeners = listener;
-		listener = listeners + listeners_num;
-		listeners_num++;
+		auto listener = Listener();
+		listener.addr = grpc::string(ci->values[0].value.string);
+		listener.port = grpc::string(ci->values[1].value.string);
+		listener.ssl = nullptr;
 
-		listener->addr = strdup(ci->values[0].value.string);
-		listener->port = strdup(ci->values[1].value.string);
+		auto ssl_opts = new(grpc::SslServerCredentialsOptions);
+		grpc::SslServerCredentialsOptions::PemKeyCertPair pkcp = {};
+		bool use_ssl = false;
 
-		for (i = 0; i < ci->children_num; i++) {
+		for (int i = 0; i < ci->children_num; i++) {
 			oconfig_item_t *child = ci->children + i;
-			WARNING("grpc: Option `%s` not allowed in <%s> block.",
-					child->key, ci->key);
+
+			if (!strcasecmp("EnableSSL", child->key)) {
+				if (cf_util_get_boolean(child, &use_ssl)) {
+					ERROR("grpc: Option `%s` expects a boolean value",
+							child->key);
+					return -1;
+				}
+			}
+			else if (!strcasecmp("SSLRootCerts", child->key)) {
+				char *certs = NULL;
+				if (cf_util_get_string(child, &certs)) {
+					ERROR("grpc: Option `%s` expects a string value",
+							child->key);
+					return -1;
+				}
+				ssl_opts->pem_root_certs = read_file(certs);
+			}
+			else if (!strcasecmp("SSLServerKey", child->key)) {
+				char *key = NULL;
+				if (cf_util_get_string(child, &key)) {
+					ERROR("grpc: Option `%s` expects a string value",
+							child->key);
+					return -1;
+				}
+				pkcp.private_key = read_file(key);
+			}
+			else if (!strcasecmp("SSLServerCert", child->key)) {
+				char *cert = NULL;
+				if (cf_util_get_string(child, &cert)) {
+					ERROR("grpc: Option `%s` expects a string value",
+							child->key);
+					return -1;
+				}
+				pkcp.cert_chain = read_file(cert);
+			}
+			else {
+				WARNING("grpc: Option `%s` not allowed in <%s> block.",
+						child->key, ci->key);
+			}
 		}
 
+		ssl_opts->pem_key_cert_pairs.push_back(pkcp);
+		if (use_ssl)
+			listener.ssl = ssl_opts;
+		else
+			delete(ssl_opts);
+
+		listeners.push_back(listener);
 		return 0;
 	} /* c_grpc_config_listen() */
 
@@ -393,7 +649,7 @@ extern "C" {
 
 		server->Start();
 		for (i = 0; i < workers_num; i++) {
-			pthread_create(&workers[i], /* attr = */ NULL,
+			plugin_thread_create(&workers[i], /* attr = */ NULL,
 					worker_thread, server);
 		}
 		INFO("grpc: Started %zu workers", workers_num);