1 files changed, 28 insertions, 8 deletions
diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 668f1e566c01..0ffbd6e552b7 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -12,6 +12,8 @@
 
 #include <chrono>
 
+#include <future>
+
 namespace nix {
 
 BinaryCacheStore::BinaryCacheStore(const Params & params)
@@ -58,6 +60,19 @@ void BinaryCacheStore::notImpl()
     throw Error("operation not implemented for binary cache stores");
 }
 
+std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
+{
+    std::promise<std::shared_ptr<std::string>> promise;
+    getFile(path,
+        [&](std::shared_ptr<std::string> result) {
+            promise.set_value(result);
+        },
+        [&](std::exception_ptr exc) {
+            promise.set_exception(exc);
+        });
+    return promise.get_future().get();
+}
+
 Path BinaryCacheStore::narInfoFileFor(const Path & storePath)
 {
     assertStorePath(storePath);
@@ -176,17 +191,22 @@ void BinaryCacheStore::narFromPath(const Path & storePath, Sink & sink)
     sink((unsigned char *) nar->c_str(), nar->size());
 }
 
-std::shared_ptr<ValidPathInfo> BinaryCacheStore::queryPathInfoUncached(const Path & storePath)
+void BinaryCacheStore::queryPathInfoUncached(const Path & storePath,
+        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
+        std::function<void(std::exception_ptr exc)> failure)
 {
     auto narInfoFile = narInfoFileFor(storePath);
-    auto data = getFile(narInfoFile);
-    if (!data) return 0;
 
-    auto narInfo = make_ref<NarInfo>(*this, *data, narInfoFile);
+    getFile(narInfoFile,
+        [=](std::shared_ptr<std::string> data) {
+            if (!data) return success(0);
 
-    stats.narInfoRead++;
+            stats.narInfoRead++;
 
-    return std::shared_ptr<NarInfo>(narInfo);
+            callSuccess(success, failure, (std::shared_ptr<ValidPathInfo>)
+                std::make_shared<NarInfo>(*this, *data, narInfoFile));
+        },
+        failure);
 }
 
 Path BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
@@ -209,7 +229,7 @@ Path BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
     }
 
     ValidPathInfo info;
-    info.path = makeFixedOutputPath(recursive, hashAlgo, h, name);
+    info.path = makeFixedOutputPath(recursive, h, name);
 
     addToStore(info, *sink.s, repair);
 
@@ -254,7 +274,7 @@ struct BinaryCacheStoreAccessor : public FSAccessor
         std::string restPath = std::string(path, storePath.size());
 
         if (!store->isValidPath(storePath))
-            throw Error(format("path ‘%1%’ is not a valid store path") % storePath);
+            throw InvalidPath(format("path ‘%1%’ is not a valid store path") % storePath);
 
         auto i = nars.find(storePath);
         if (i != nars.end()) return {i->second, restPath};