X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fgrpc.cc;h=8b76954d6748090a795d2eaf09fcfe7a8110f7c0;hb=75d4c13daf6c1226710b64ff3a793afa31721b81;hp=a38abc1dedeb079a0e54f72acc6f1fb608c3dfe8;hpb=f7e7130af45d2320d5bf1a4c7cf6f553f213f1fc;p=collectd.git

diff --git a/src/grpc.cc b/src/grpc.cc
index a38abc1d..8b76954d 100644
--- a/src/grpc.cc
+++ b/src/grpc.cc
@@ -420,12 +420,60 @@ private:
 	std::unique_ptr<grpc::Server> server_;
 }; /* class CollectdServer */
 
+class CollectdClient final
+{
+public:
+	CollectdClient(std::shared_ptr<grpc::ChannelInterface> channel) : stub_(Collectd::NewStub(channel)) {
+	}
+
+	int DispatchValues(value_list_t const *vl) {
+		grpc::ClientContext ctx;
+
+		DispatchValuesRequest req;
+		auto status = marshal_value_list(vl, req.mutable_value_list());
+		if (!status.ok()) {
+			ERROR("grpc: Marshalling value_list_t failed.");
+			return -1;
+		}
+
+		DispatchValuesResponse res;
+		auto stream = stub_->DispatchValues(&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 DispatchValues */
+
+private:
+	std::unique_ptr<Collectd::Stub> stub_;
+};
+
 static CollectdServer *server = nullptr;
 
 /*
  * collectd plugin interface
  */
 extern "C" {
+	static void c_grpc_destroy_write_callback (void *ptr) {
+		delete (CollectdClient *) ptr;
+	}
+
+	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->DispatchValues(vl);
+	}
+
 	static int c_grpc_config_listen(oconfig_item_t *ci)
 	{
 		if ((ci->values_num != 2)
@@ -455,7 +503,7 @@ extern "C" {
 					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",
@@ -464,7 +512,7 @@ extern "C" {
 				}
 				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",
@@ -473,7 +521,7 @@ extern "C" {
 				}
 				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",
@@ -498,6 +546,78 @@ extern "C" {
 		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;
@@ -509,6 +629,11 @@ extern "C" {
 				if (c_grpc_config_listen(child))
 					return -1;
 			}
+			else if (!strcasecmp("Server", child->key)) {
+				if (c_grpc_config_server(child))
+					return -1;
+			}
+
 			else {
 				WARNING("grpc: Option `%s` not allowed here.", child->key);
 			}