From b373a645f787f28a4f7a831c161553df6fd4d72c Mon Sep 17 00:00:00 2001
From: Dan Engelbrecht <dan.engelbrecht@epicgames.com>
Date: Thu, 19 May 2022 15:11:35 +0200
Subject: migrate legacy cache folders to ue4.ddc namespace map default
 namespace to at runtime ue4.ddc use a non-valid name for the default
 namespace so we avoid any collision or accidental creation of folder for that

---
 zenserver/cache/structuredcachestore.cpp | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

(limited to 'zenserver/cache/structuredcachestore.cpp')

diff --git a/zenserver/cache/structuredcachestore.cpp b/zenserver/cache/structuredcachestore.cpp
index 6b7b73dcf..9218c2cbb 100644
--- a/zenserver/cache/structuredcachestore.cpp
+++ b/zenserver/cache/structuredcachestore.cpp
@@ -2128,6 +2128,8 @@ ZenCacheDiskLayer::TotalSize() const
 
 //////////////////////////// ZenCacheStore
 
+static constexpr std::string_view UE4DDCNamespaceName = "ue4.ddc";
+
 ZenCacheStore::ZenCacheStore(CasGc& Gc, std::filesystem::path BasePath) : GcStorage(Gc), GcContributor(Gc)
 {
 	CreateDirectories(BasePath);
@@ -2150,11 +2152,13 @@ ZenCacheStore::ZenCacheStore(CasGc& Gc, std::filesystem::path BasePath) : GcStor
 
 	ZEN_INFO("Found #{} namespaces in '{}' and #{} legacy buckets", Namespaces.size(), BasePath, LegacyBuckets.size());
 
-	if (std::find(Namespaces.begin(), Namespaces.end(), DefaultNamespace) == Namespaces.end())
+	if (std::find(Namespaces.begin(), Namespaces.end(), UE4DDCNamespaceName) == Namespaces.end())
 	{
-		ZEN_INFO("Moving #{} legacy buckets to anonymous namespace", LegacyBuckets.size());
+		// default (unspecified) and ue4-ddc namespace points to the same namespace instance
+
+		ZEN_INFO("Moving #{} legacy buckets to '{}' namespace", LegacyBuckets.size(), UE4DDCNamespaceName);
 
-		std::filesystem::path DefaultNamespaceFolder = BasePath / fmt::format("{}{}", NamespaceDiskPrefix, DefaultNamespace);
+		std::filesystem::path DefaultNamespaceFolder = BasePath / fmt::format("{}{}", NamespaceDiskPrefix, UE4DDCNamespaceName);
 		CreateDirectories(DefaultNamespaceFolder);
 
 		// Move any non-namespace folders into the default namespace folder
@@ -2169,8 +2173,7 @@ ZenCacheStore::ZenCacheStore(CasGc& Gc, std::filesystem::path BasePath) : GcStor
 				ZEN_ERROR("Unable to move '{}' to '{}', reason '{}'", LegacyFolder, NewPath, Ec.message());
 			}
 		}
-
-		Namespaces.push_back(std::string(DefaultNamespace));
+		Namespaces.push_back(std::string(UE4DDCNamespaceName));
 	}
 
 	for (const std::string& NamespaceName : Namespaces)
@@ -2237,6 +2240,13 @@ ZenCacheStore::GetNamespace(std::string_view Namespace)
 	{
 		return It->second.get();
 	}
+	if (Namespace == DefaultNamespace)
+	{
+		if (auto It = m_Namespaces.find(std::string(UE4DDCNamespaceName)); It != m_Namespaces.end())
+		{
+			return It->second.get();
+		}
+	}
 	return nullptr;
 }
 
@@ -2249,6 +2259,10 @@ ZenCacheStore::IterateNamespaces(const std::function<void(std::string_view Names
 		Namespaces.reserve(m_Namespaces.size());
 		for (const auto& Entry : m_Namespaces)
 		{
+			if (Entry.first == DefaultNamespace)
+			{
+				continue;
+			}
 			Namespaces.push_back({Entry.first, *Entry.second});
 		}
 	}
-- 
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