feat(3p/nix): Implement two more RPC calls

Implement AddTextToStore and BuildPaths both on the client and the
server

Refs: #29
Change-Id: I45294c3e1c1a7489e42099d36425b7acc04e0427
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1560
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Tested-by: BuildkiteCI

third_party/nix/src/libstore/rpc-store.cc

@@ -214,9 +214,23 @@ Path RpcStore::addToStore(const std::string& name, const Path& srcPath,
   throw absl::StrCat("Not implemented ", __func__);
 }
 
-Path RpcStore::addTextToStore(const std::string& name, const std::string& s,
+Path RpcStore::addTextToStore(const std::string& name,
+                              const std::string& content,
                               const PathSet& references, RepairFlag repair) {
-  throw absl::StrCat("Not implemented ", __func__);
+  if (repair != 0u) {
+    throw Error(
+        "repairing is not supported when building through the Nix daemon");
+  }
+  ClientContext ctx;
+  proto::AddTextToStoreRequest request;
+  request.set_name(name);
+  request.set_content(content);
+  for (const auto& ref : references) {
+    request.add_references(ref);
+  }
+  proto::StorePath result;
+  SuccessOrThrow(stub_->AddTextToStore(&ctx, request, &result));
+  return result.path();
 }
 
 void RpcStore::narFromPath(const Path& path, Sink& sink) {
@@ -224,7 +238,14 @@ void RpcStore::narFromPath(const Path& path, Sink& sink) {
 }
 
 void RpcStore::buildPaths(const PathSet& paths, BuildMode buildMode) {
-  throw absl::StrCat("Not implemented ", __func__);
+  ClientContext ctx;
+  proto::BuildPathsRequest request;
+  for (const auto& path : paths) {
+    request.add_drvs(path);
+  }
+  google::protobuf::Empty response;
+  request.set_mode(nix::BuildModeToProto(buildMode));
+  SuccessOrThrow(stub_->BuildPaths(&ctx, request, &response));
 }
 
 BuildResult RpcStore::buildDerivation(const Path& drvPath,

third_party/nix/src/libstore/store-api.cc

@@ -10,6 +10,7 @@
 #include <glog/logging.h>
 #include <grpcpp/create_channel.h>
 
+#include "libproto/worker.pb.h"
 #include "libstore/crypto.hh"
 #include "libstore/derivations.hh"
 #include "libstore/globals.hh"
@@ -21,7 +22,7 @@
 
 namespace nix {
 
-std::optional<BuildMode> build_mode_from(nix::proto::BuildMode mode) {
+std::optional<BuildMode> BuildModeFrom(nix::proto::BuildMode mode) {
   switch (mode) {
     case nix::proto::BuildMode::Normal:
       return BuildMode::bmNormal;
@@ -34,6 +35,17 @@ std::optional<BuildMode> build_mode_from(nix::proto::BuildMode mode) {
   }
 }
 
+nix::proto::BuildMode BuildModeToProto(BuildMode mode) {
+  switch (mode) {
+    case BuildMode::bmNormal:
+      return nix::proto::BuildMode::Normal;
+    case BuildMode::bmRepair:
+      return nix::proto::BuildMode::Repair;
+    case BuildMode::bmCheck:
+      return nix::proto::BuildMode::Check;
+  }
+}
+
 nix::proto::BuildStatus BuildResult::status_to_proto() {
   switch (status) {
     case BuildResult::Status::Built:

third_party/nix/src/libstore/store-api.hh

@@ -184,7 +184,10 @@ enum BuildMode { bmNormal, bmRepair, bmCheck };
 
 // Convert the proto version of a `nix::proto::BuildMode` to its corresponding
 // nix `BuildMode`
-std::optional<BuildMode> build_mode_from(nix::proto::BuildMode mode);
+std::optional<BuildMode> BuildModeFrom(nix::proto::BuildMode mode);
+
+// Convert a `nix::BuildMode` to its corresponding proto representation
+nix::proto::BuildMode BuildModeToProto(BuildMode mode);
 
 struct BuildResult {
   /* Note: don't remove status codes, and only add new status codes

third_party/nix/src/nix-daemon/nix-daemon-proto.cc

@@ -172,6 +172,40 @@ class WorkerServiceImpl final : public WorkerService::Service {
     return Status::OK;
   }
 
+  Status AddTextToStore(grpc::ServerContext*,
+                        const nix::proto::AddTextToStoreRequest* request,
+                        nix::proto::StorePath* response) override {
+    PathSet references;
+    for (const auto& ref : request->references()) {
+      references.insert(ref);
+    }
+    auto path =
+        store_->addTextToStore(request->name(), request->content(), references);
+    response->set_path(path);
+    return Status::OK;
+  }
+
+  Status BuildPaths(grpc::ServerContext*,
+                    const nix::proto::BuildPathsRequest* request,
+                    google::protobuf::Empty*) override {
+    PathSet drvs;
+    for (const auto& drv : request->drvs()) {
+      drvs.insert(drv);
+    }
+    auto mode = BuildModeFrom(request->mode());
+
+    if (!mode.has_value()) {
+      return Status(grpc::StatusCode::INTERNAL, "Invalid build mode");
+    }
+
+    // TODO(grfn): If mode is repair and not trusted, we need to return an error
+    // here (but we can't yet because we don't know anything about trusted
+    // users)
+    store_->buildPaths(drvs, mode.value());
+
+    return Status::OK;
+  }
+
   Status QuerySubstitutablePathInfos(
       grpc::ServerContext*, const StorePaths* request,
       nix::proto::SubstitutablePathInfos* response) override {
@@ -357,7 +391,7 @@ class WorkerServiceImpl final : public WorkerService::Service {
     store_->assertStorePath(drv_path);
     auto drv = BasicDerivation::from_proto(&request->derivation(), *store_);
 
-    auto build_mode = nix::build_mode_from(request->build_mode());
+    auto build_mode = nix::BuildModeFrom(request->build_mode());
     if (!build_mode) {
       return Status(grpc::StatusCode::INTERNAL, "Invalid build mode");
     }