libstore: asyncify Store::getClosureSize

Change-Id: I625c92f94e2a77b64569d385d486434ae41df2da

lix/libstore/store-api.cc

@@ -1002,7 +1002,7 @@ try {
             std::pair<uint64_t, uint64_t> closureSizes;
 
             if (showClosureSize) {
-                closureSizes = getClosureSize(info->path);
+                closureSizes = TRY_AWAIT(getClosureSize(info->path));
                 jsonPath["closureSize"] = closureSizes.first;
             }
 
@@ -1048,8 +1048,9 @@ try {
 }
 
 
-std::pair<uint64_t, uint64_t> Store::getClosureSize(const StorePath & storePath)
-{
+kj::Promise<Result<std::pair<uint64_t, uint64_t>>>
+Store::getClosureSize(const StorePath & storePath)
+try {
     uint64_t totalNarSize = 0, totalDownloadSize = 0;
     StorePathSet closure;
     computeFSClosure(storePath, closure, false, false);
@@ -1061,7 +1062,9 @@ std::pair<uint64_t, uint64_t> Store::getClosureSize(const StorePath & storePath)
         if (narInfo)
             totalDownloadSize += narInfo->fileSize;
     }
-    return {totalNarSize, totalDownloadSize};
+    co_return {totalNarSize, totalDownloadSize};
+} catch (...) {
+    co_return result::current_exception();
 }
 
 

lix/libstore/store-api.hh

@@ -702,7 +702,7 @@ public:
      * the sum of the size of the NAR serialisation of each path in the
      * closure.
      */
-    std::pair<uint64_t, uint64_t> getClosureSize(const StorePath & storePath);
+    kj::Promise<Result<std::pair<uint64_t, uint64_t>>> getClosureSize(const StorePath & storePath);
 
     /**
      * Optimise the disk space usage of the Nix store by hard-linking files

lix/nix/path-info.cc

@@ -112,7 +112,7 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
                     printSize(info->narSize);
 
                 if (showClosureSize)
-                    printSize(store->getClosureSize(info->path).first);
+                    printSize(aio().blockOn(store->getClosureSize(info->path)).first);
 
                 if (showSigs) {
                     std::cout << '\t';