From ea231c7138d3dea8cd4cd75692137e078cbdd73d Mon Sep 17 00:00:00 2001
From: James Vecore <vecore@google.com>
Date: Mon, 12 Jul 2021 16:05:16 -0700
Subject: [PATCH] [Nearby] Acquire mutex in ClientProxy::GetLocalEndpointId

This method is called from multiple threads and needs to ensure the local_endpoint_id_ data member can be read/updated safely from multiple threads.

PiperOrigin-RevId: 384337724
---
 cpp/core/internal/client_proxy.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cpp/core/internal/client_proxy.cc b/cpp/core/internal/client_proxy.cc
index 6705c24c..4db73d2e 100644
--- a/cpp/core/internal/client_proxy.cc
+++ b/cpp/core/internal/client_proxy.cc
@@ -48,6 +48,7 @@ ClientProxy::~ClientProxy() { Reset(); }
 std::int64_t ClientProxy::GetClientId() const { return client_id_; }
 
 std::string ClientProxy::GetLocalEndpointId() {
+  MutexLock lock(&mutex_);
   if (local_endpoint_id_.empty()) {
     local_endpoint_id_ = GenerateLocalEndpointId();
     NEARBY_LOGS(INFO) << "ClientProxy [Local Endpoint Generated]: client="