Separate action and worker chunk stores for compute servicesb/compute-oidc-auth

Extract ChunkStore interface from CidStore so HttpComputeService can
accept different storage backends for action inputs vs worker binaries.
Action inputs use MemoryCidStore (no disk persistence) while workers
use a disk-backed CidStore for cross-action reuse.

- Add ChunkStore abstract class (AddChunk, ContainsChunk, FilterChunks)
  and FallbackChunkResolver to zenstore.h
- CidStore and MemoryCidStore both implement ChunkStore
- HttpComputeService takes two ChunkStore& params (action + worker)
- Compute server wires MemoryCidStore for actions, CidStore for workers
- Storage server passes its CidStore for both (unchanged behavior)

2 files changed, 10 insertions, 7 deletions

diff --git a/src/zenserver/compute/computeserver.cpp b/src/zenserver/compute/computeserver.cpp
index 6f2f6d8c8..8cd8b4cfe 100644
--- a/src/zenserver/compute/computeserver.cpp
+++ b/src/zenserver/compute/computeserver.cpp
@@ -521,11 +521,12 @@ ZenComputeServer::InitializeServices(const ZenComputeServerConfig& ServerConfig)
 	ZEN_TRACE_CPU("ZenComputeServer::InitializeServices");
 	ZEN_INFO("initializing compute services");
 
-	CidStoreConfiguration Config;
-	Config.RootDirectory = m_DataRoot / "cas";
+	m_ActionStore = std::make_unique<MemoryCidStore>();
 
-	m_CidStore = std::make_unique<CidStore>(m_GcManager);
-	m_CidStore->Initialize(Config);
+	CidStoreConfiguration WorkerStoreConfig;
+	WorkerStoreConfig.RootDirectory = m_DataRoot / "cas";
+	m_WorkerStore					= std::make_unique<CidStore>(m_GcManager);
+	m_WorkerStore->Initialize(WorkerStoreConfig);
 
 	if (!ServerConfig.IdmsEndpoint.empty())
 	{
@@ -553,7 +554,8 @@ ZenComputeServer::InitializeServices(const ZenComputeServerConfig& ServerConfig)
 		std::make_unique<zen::compute::HttpOrchestratorService>(ServerConfig.DataDir / "orch", ServerConfig.EnableWorkerWebSocket);
 
 	ZEN_INFO("instantiating function service");
-	m_ComputeService = std::make_unique<zen::compute::HttpComputeService>(*m_CidStore,
+	m_ComputeService = std::make_unique<zen::compute::HttpComputeService>(*m_ActionStore,
+																		  *m_WorkerStore,
 																		  m_StatsService,
 																		  ServerConfig.DataDir / "functions",
 																		  ServerConfig.MaxConcurrentActions);
diff --git a/src/zenserver/compute/computeserver.h b/src/zenserver/compute/computeserver.h
index 5a95f9360..63db7e9b3 100644
--- a/src/zenserver/compute/computeserver.h
+++ b/src/zenserver/compute/computeserver.h
@@ -10,6 +10,7 @@
 #	include <zencore/system.h>
 #	include <zenhttp/httpwsclient.h>
 #	include <zenstore/gc.h>
+#	include <zenstore/memorycidstore.h>
 #	include "frontend/frontend.h"
 
 namespace cxxopts {
@@ -41,7 +42,6 @@ class NomadProvisioner;
 
 namespace zen {
 
-class CidStore;
 class HttpApiService;
 
 struct ZenComputeServerConfig : public ZenServerConfig
@@ -136,7 +136,8 @@ public:
 private:
 	GcManager												  m_GcManager;
 	GcScheduler												  m_GcScheduler{m_GcManager};
-	std::unique_ptr<CidStore>								  m_CidStore;
+	std::unique_ptr<MemoryCidStore>							  m_ActionStore;
+	std::unique_ptr<CidStore>								  m_WorkerStore;
 	std::unique_ptr<HttpApiService>							  m_ApiService;
 	std::unique_ptr<zen::compute::HttpComputeService>		  m_ComputeService;
 	std::unique_ptr<zen::compute::HttpOrchestratorService>	  m_OrchestratorService;