refer to grpc::Channel by forward decl

CMakeLists.txt

@@ -430,6 +430,10 @@ if ((VIAMCPPSDK_GRPCXX_VERSION VERSION_GREATER 1.51.1) AND (VIAMCPPSDK_PROTOC_VE
   set(VIAMCPPSDK_BUF_REMOTE_PLUGIN_SUPPORTED 1)
 endif()
 
+if (VIAMCPPSDK_GRPCXX_VERSION VERSION_LESS 1.32.0)
+  set(VIAMCPPSDK_GRPCXX_LEGACY_CLIENT_FWD 1)
+endif()
+
 include(FetchContent)
 
 FetchContent_Declare(

src/viam/sdk/CMakeLists.txt

@@ -29,6 +29,8 @@ endif()
 message(WARNING "api proto label is ${VIAMCPPSDK_API_PROTO_LABEL}")
 configure_file(common/private/version_metadata.hpp.in common/private/version_metadata.hpp @ONLY)
 
+# Configure the grpc client forward declarations file
+configure_file(common/grpc_client_fwd.hpp.in common/grpc_client_fwd.hpp)
 
 # Set compile and link options based on arguments
 if (VIAMCPPSDK_USE_WALL_WERROR)
@@ -137,6 +139,7 @@ target_sources(viamsdk
   PUBLIC FILE_SET viamsdk_public_includes TYPE HEADERS
     BASE_DIRS
       ../..
+      ${CMAKE_CURRENT_BINARY_DIR}
     FILES
       ../../viam/sdk/common/client_helper.hpp
       ../../viam/sdk/common/exception.hpp
@@ -189,6 +192,7 @@ target_sources(viamsdk
       ../../viam/sdk/spatialmath/geometry.hpp
       ../../viam/sdk/spatialmath/orientation.hpp
       ../../viam/sdk/spatialmath/orientation_types.hpp
+      ${CMAKE_CURRENT_BINARY_DIR}/common/grpc_client_fwd.hpp
 )
 
 set_target_properties(
@@ -207,7 +211,6 @@ target_include_directories(viamsdk
     "$<INSTALL_INTERFACE:${VIAMCPPSDK_GRPC_INCLUDE_DIRS}>"
     "$<BUILD_INTERFACE:${VIAMCPPSDK_PROTOBUF_INCLUDE_DIRS}>"
     "$<INSTALL_INTERFACE:${VIAMCPPSDK_PROTOBUF_INCLUDE_DIRS}>"
-  PRIVATE
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/../..>"
 )
 

src/viam/sdk/common/client_helper.cpp

@@ -2,8 +2,12 @@
 
 #include <cstdlib>
 
+#include <grpcpp/client_context.h>
+
 #include <boost/log/trivial.hpp>
 
+#include <viam/sdk/common/private/version_metadata.hpp>
+
 namespace viam {
 namespace sdk {
 
@@ -16,5 +20,37 @@ namespace client_helper_details {
 }
 
 }  // namespace client_helper_details
+
+ClientContext::ClientContext() : wrapped_context_(std::make_unique<GrpcClientContext>()) {
+    set_client_ctx_authority_();
+    add_viam_client_version_();
+}
+
+ClientContext::~ClientContext() = default;
+
+ClientContext::operator const GrpcClientContext*() const {
+    return wrapped_context_.get();
+}
+
+ClientContext::operator GrpcClientContext*() {
+    return wrapped_context_.get();
+}
+
+void ClientContext::try_cancel() {
+    wrapped_context_->TryCancel();
+}
+
+void ClientContext::set_debug_key(const std::string& debug_key) {
+    wrapped_context_->AddMetadata("dtname", debug_key);
+}
+
+void ClientContext::set_client_ctx_authority_() {
+    wrapped_context_->set_authority("viam-placeholder");
+}
+
+void ClientContext::add_viam_client_version_() {
+    wrapped_context_->AddMetadata("viam_client", impl::k_version);
+}
+
 }  // namespace sdk
 }  // namespace viam

src/viam/sdk/common/client_helper.hpp

@@ -1,12 +1,9 @@
 #pragma once
 
-#include <grpcpp/client_context.h>
-#include <grpcpp/support/sync_stream.h>
-
 #include <viam/sdk/common/exception.hpp>
+#include <viam/sdk/common/grpc_client_fwd.hpp>
 #include <viam/sdk/common/private/utils.hpp>
 #include <viam/sdk/common/proto_value.hpp>
-#include <viam/sdk/common/utils.hpp>
 
 namespace grpc {
 
@@ -23,16 +20,39 @@ namespace client_helper_details {
 
 }  // namespace client_helper_details
 
+// the authority on a grpc::ClientContext is sometimes set to an invalid uri on mac, causing
+// `rust-utils` to fail to process gRPC requests. This class provides a convenience wrapper around a
+// grpc ClientContext that allows us to make any necessary modifications to authority or else where
+// to avoid runtime issues.
+// For more details, see https://viam.atlassian.net/browse/RSDK-5194.
+class ClientContext {
+   public:
+    ClientContext();
+    ~ClientContext();
+
+    void try_cancel();
+
+    operator GrpcClientContext*();
+    operator const GrpcClientContext*() const;
+
+    void set_debug_key(const std::string& debug_key);
+
+   private:
+    void set_client_ctx_authority_();
+    void add_viam_client_version_();
+    std::unique_ptr<GrpcClientContext> wrapped_context_;
+};
+
 // Method type for a gRPC call that returns a response message type.
 template <typename StubType, typename RequestType, typename ResponseType>
-using SyncMethodType = ::grpc::Status (StubType::*)(::grpc::ClientContext*,
+using SyncMethodType = ::grpc::Status (StubType::*)(GrpcClientContext*,
                                                     const RequestType&,
                                                     ResponseType*);
 
 // Method type for a gRPC call that returns a stream of response message type.
 template <typename StubType, typename RequestType, typename ResponseType>
-using StreamingMethodType = std::unique_ptr<::grpc::ClientReaderInterface<ResponseType>> (
-    StubType::*)(::grpc::ClientContext*, const RequestType&);
+using StreamingMethodType = std::unique_ptr<GrpcClientReaderInterface<ResponseType>> (StubType::*)(
+    GrpcClientContext*, const RequestType&);
 
 template <typename ClientType,
           typename StubType,

src/viam/sdk/common/grpc_client_fwd.hpp.in

@@ -0,0 +1,63 @@
+#pragma once
+
+#cmakedefine VIAMCPPSDK_GRPCXX_LEGACY_CLIENT_FWD
+
+#ifndef VIAMCPPSDK_GRPCXX_LEGACY_CLIENT_FWD
+
+// Forward declaration file for grpc ClientContext and ClientReaderInterface<T>.
+// This file provides includes for recent (>= 1.32.0) versions of grpc.
+
+namespace grpc {
+
+class Channel;
+
+class ClientContext;
+
+template <typename>
+class ClientReaderInterface;
+
+}  // namespace grpc
+
+namespace viam {
+namespace sdk {
+
+using GrpcChannel = ::grpc::Channel;
+
+using GrpcClientContext = ::grpc::ClientContext;
+
+template <typename T>
+using GrpcClientReaderInterface = ::grpc::ClientReaderInterface<T>;
+
+}  // namespace sdk
+}  // namespace viam
+
+#else
+
+// Forward declaration file for grpc ClientContext and ClientReaderInterface<T>.
+// This file provides includes for the oldest supported versions of grpc (< 1.32.0).
+
+namespace grpc_impl {
+
+class Channel;
+
+class ClientContext;
+
+template <typename>
+class ClientReaderInterface;
+
+}  // namespace grpc_impl
+
+namespace viam {
+namespace sdk {
+
+using GrpcChannel = ::grpc_impl::Channel;
+
+using GrpcClientContext = ::grpc_impl::ClientContext;
+
+template <typename T>
+using GrpcClientReaderInterface = ::grpc_impl::ClientReaderInterface<T>;
+
+}  // namespace sdk
+}  // namespace viam
+
+#endif

src/viam/sdk/common/utils.cpp

@@ -18,7 +18,6 @@
 #include <viam/api/common/v1/common.pb.h>
 
 #include <viam/sdk/common/private/utils.hpp>
-#include <viam/sdk/common/private/version_metadata.hpp>
 #include <viam/sdk/components/component.hpp>
 #include <viam/sdk/registry/registry.hpp>
 
@@ -151,37 +150,6 @@ ProtoStruct with_debug_entry(ProtoStruct&& map) {
     return map;
 }
 
-ClientContext::ClientContext() : wrapped_context_(std::make_unique<grpc::ClientContext>()) {
-    set_client_ctx_authority_();
-    add_viam_client_version_();
-}
-
-ClientContext::~ClientContext() = default;
-
-ClientContext::operator const grpc::ClientContext*() const {
-    return wrapped_context_.get();
-}
-
-ClientContext::operator grpc::ClientContext*() {
-    return wrapped_context_.get();
-}
-
-void ClientContext::try_cancel() {
-    wrapped_context_->TryCancel();
-}
-
-void ClientContext::set_debug_key(const std::string& debug_key) {
-    wrapped_context_->AddMetadata("dtname", debug_key);
-}
-
-void ClientContext::set_client_ctx_authority_() {
-    wrapped_context_->set_authority("viam-placeholder");
-}
-
-void ClientContext::add_viam_client_version_() {
-    wrapped_context_->AddMetadata("viam_client", impl::k_version);
-}
-
 bool from_dm_from_extra(const ProtoStruct& extra) {
     auto pos = extra.find("fromDataManagement");
     if (pos != extra.end()) {

src/viam/sdk/common/utils.hpp

@@ -3,7 +3,6 @@
 #include <memory>
 
 #include <boost/optional/optional.hpp>
-#include <grpcpp/client_context.h>
 
 #include <viam/sdk/common/proto_value.hpp>
 #include <viam/sdk/components/component.hpp>
@@ -82,29 +81,6 @@ struct from_proto<common::v1::ResponseMetadata> {
 std::vector<unsigned char> string_to_bytes(std::string const& s);
 std::string bytes_to_string(std::vector<unsigned char> const& b);
 
-// the authority on a grpc::ClientContext is sometimes set to an invalid uri on mac, causing
-// `rust-utils` to fail to process gRPC requests. This class provides a convenience wrapper around a
-// grpc ClientContext that allows us to make any necessary modifications to authority or else where
-// to avoid runtime issues.
-// For more details, see https://viam.atlassian.net/browse/RSDK-5194.
-class ClientContext {
-   public:
-    ClientContext();
-    ~ClientContext();
-
-    void try_cancel();
-
-    operator grpc::ClientContext*();
-    operator const grpc::ClientContext*() const;
-
-    void set_debug_key(const std::string& debug_key);
-
-   private:
-    void set_client_ctx_authority_();
-    void add_viam_client_version_();
-    std::unique_ptr<grpc::ClientContext> wrapped_context_;
-};
-
 /// @brief Given a fully qualified resource name, returns remote name (or "" if no remote name
 /// exists) and short name
 std::pair<std::string, std::string> long_name_to_remote_and_short(const std::string& long_name);

src/viam/sdk/module/module.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <viam/sdk/common/grpc_client_fwd.hpp>
 #include <viam/sdk/module/handler_map.hpp>
 #include <viam/sdk/resource/resource.hpp>
 #include <viam/sdk/resource/resource_manager.hpp>
@@ -18,14 +19,14 @@ class Module {
     bool ready() const;
     const HandlerMap_& handles() const;
     HandlerMap_& mutable_handles();
-    const std::shared_ptr<grpc::Channel>& channel() const;
+    const std::shared_ptr<GrpcChannel>& channel() const;
 
    private:
     std::string name_;
     std::string addr_;
     bool ready_;
     HandlerMap_ handles_;
-    std::shared_ptr<grpc::Channel> channel_;
+    std::shared_ptr<GrpcChannel> channel_;
 };
 
 }  // namespace sdk

src/viam/sdk/registry/registry.cpp

@@ -55,9 +55,32 @@
 namespace viam {
 namespace sdk {
 
+ResourceServerRegistration::ResourceServerRegistration(
+    const google::protobuf::ServiceDescriptor* service_descriptor)
+    : service_descriptor_(service_descriptor) {}
+
 ResourceServerRegistration::~ResourceServerRegistration() = default;
 ResourceClientRegistration::~ResourceClientRegistration() = default;
 
+ModelRegistration::ModelRegistration(
+    API api,
+    Model model,
+    std::function<std::shared_ptr<Resource>(Dependencies, ResourceConfig)> constructor)
+    : construct_resource(std::move(constructor)),
+      validate(default_validator),
+      model_(std::move(model)),
+      api_(std::move(api)) {}
+
+ModelRegistration::ModelRegistration(
+    API api,
+    Model model,
+    std::function<std::shared_ptr<Resource>(Dependencies, ResourceConfig)> constructor,
+    std::function<std::vector<std::string>(ResourceConfig)> validator)
+    : construct_resource(std::move(constructor)),
+      validate(std::move(validator)),
+      model_(std::move(model)),
+      api_(std::move(api)) {}
+
 const API& ModelRegistration::api() const {
     return api_;
 };