Make number of stubs per channel configurable and expose metrics from
client
diff --git a/test/cpp/util/metrics_server.cc b/test/cpp/util/metrics_server.cc
new file mode 100644
index 0000000..42a8911
--- /dev/null
+++ b/test/cpp/util/metrics_server.cc
@@ -0,0 +1,118 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *is % allowed in string
+ */
+
+#include "test/cpp/util/metrics_server.h"
+
+#include <vector>
+
+#include <grpc++/server_builder.h>
+
+#include "test/proto/metrics.grpc.pb.h"
+#include "test/proto/metrics.pb.h"
+
+namespace grpc {
+namespace testing {
+
+using std::vector;
+
+Guage::Guage(long initial_val) : val_(initial_val) {}
+
+void Guage::Set(long new_val) {
+ val_.store(new_val, std::memory_order_relaxed);
+}
+
+long Guage::Get() { return val_.load(std::memory_order_relaxed); }
+
+grpc::Status MetricsServiceImpl::GetAllGuages(
+ ServerContext* context, const EmptyMessage* request,
+ ServerWriter<GuageResponse>* writer) {
+ gpr_log(GPR_INFO, "GetAllGuages called");
+
+ std::lock_guard<std::mutex> lock(mu_);
+ for (auto it = guages_.begin(); it != guages_.end(); it++) {
+ GuageResponse resp;
+ resp.set_name(it->first); // Guage name
+ resp.set_value(it->second->Get()); // Guage value
+ writer->Write(resp);
+ }
+
+ return Status::OK;
+}
+
+grpc::Status MetricsServiceImpl::GetGuage(ServerContext* context,
+ const GuageRequest* request,
+ GuageResponse* response) {
+ std::lock_guard<std::mutex> lock(mu_);
+
+ auto it = guages_.find(request->name());
+ if (it != guages_.end()) {
+ response->set_name(it->first);
+ response->set_value(it->second->Get());
+ }
+
+ return Status::OK;
+}
+
+std::shared_ptr<Guage> MetricsServiceImpl::CreateGuage(string name,
+ bool& already_present) {
+ std::lock_guard<std::mutex> lock(mu_);
+
+ std::shared_ptr<Guage> guage(new Guage(0));
+ auto p = guages_.emplace(name, guage);
+
+ // p.first is an iterator pointing to <name, shared_ptr<Guage>> pair. p.second
+ // is a boolean indicating if the Guage is already present in the map
+ already_present = !p.second;
+ return p.first->second;
+}
+
+// Starts the metrics server and returns the grpc::Server instance. Call
+// wait() on the returned server instance.
+std::unique_ptr<grpc::Server> MetricsServiceImpl::StartServer(int port) {
+ gpr_log(GPR_INFO, "Building metrics server..");
+
+ grpc::string address = "0.0.0.0:" + std::to_string(port);
+
+ ServerBuilder builder;
+ builder.AddListeningPort(address, grpc::InsecureServerCredentials());
+ builder.RegisterService(this);
+
+ std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
+ gpr_log(GPR_INFO, "Metrics server %s started. Ready to receive requests..",
+ address.c_str());
+
+ return server;
+}
+
+} // namespace testing
+} // namespace grpc