binary-cache-store: UpsertFile accept Source & instead of std::istream

src/libstore/binary-cache-store.cc

@@ -79,7 +79,8 @@ std::optional<std::string> BinaryCacheStore::getNixCacheInfo()
 void BinaryCacheStore::upsertFile(
     const std::string & path, std::string && data, const std::string & mimeType, uint64_t sizeHint)
 {
-    upsertFile(path, std::make_shared<std::stringstream>(std::move(data)), mimeType, sizeHint);
+    StringSource source{data};
+    upsertFile(path, source, mimeType, sizeHint);
 }
 
 void BinaryCacheStore::getFile(const std::string & path, Callback<std::optional<std::string>> callback) noexcept
@@ -271,12 +272,10 @@ ref<const ValidPathInfo> BinaryCacheStore::addToStoreCommon(
 
     /* Atomically write the NAR file. */
     if (repair || !fileExists(narInfo->url)) {
+        AutoCloseFD fd = toDescriptor(open(fnTemp.c_str(), O_RDONLY));
+        FdSource source{fd.get()};
         stats.narWrite++;
-        upsertFile(
+        upsertFile(narInfo->url, source, "application/x-nix-nar", narInfo->fileSize);
-            narInfo->url,
-            std::make_shared<std::fstream>(fnTemp, std::ios_base::in | std::ios_base::binary),
-            "application/x-nix-nar",
-            narInfo->fileSize);
     } else
         stats.narWriteAverted++;
 

src/libstore/http-binary-cache-store.cc

@@ -135,15 +135,11 @@ bool HttpBinaryCacheStore::fileExists(const std::string & path)
 }
 
 void HttpBinaryCacheStore::upsertFile(
-    const std::string & path,
+    const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint)
-    std::shared_ptr<std::basic_iostream<char>> istream,
-    const std::string & mimeType,
-    uint64_t sizeHint)
 {
     auto req = makeRequest(path);
     req.method = HttpMethod::PUT;
-    auto data = StreamToSourceAdapter(istream).drain();
+    auto data = source.drain();
-
     auto compressionMethod = getCompressionMethod(path);
 
     if (compressionMethod) {

src/libstore/include/nix/store/binary-cache-store.hh

@@ -100,11 +100,8 @@ public:
 
     virtual bool fileExists(const std::string & path) = 0;
 
-    virtual void upsertFile(
+    virtual void
-        const std::string & path,
+    upsertFile(const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint) = 0;
-        std::shared_ptr<std::basic_iostream<char>> istream,
-        const std::string & mimeType,
-        uint64_t sizeHint) = 0;
 
     void upsertFile(
         const std::string & path,

src/libstore/include/nix/store/http-binary-cache-store.hh

@@ -80,11 +80,8 @@ protected:
 
     bool fileExists(const std::string & path) override;
 
-    void upsertFile(
+    void
-        const std::string & path,
+    upsertFile(const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint) override;
-        std::shared_ptr<std::basic_iostream<char>> istream,
-        const std::string & mimeType,
-        uint64_t sizeHint) override;
 
     FileTransferRequest makeRequest(std::string_view path);
 

src/libstore/local-binary-cache-store.cc

@@ -53,17 +53,12 @@ protected:
 
     bool fileExists(const std::string & path) override;
 
-    void upsertFile(
+    void upsertFile(const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint) override
-        const std::string & path,
-        std::shared_ptr<std::basic_iostream<char>> istream,
-        const std::string & mimeType,
-        uint64_t sizeHint) override
     {
         auto path2 = config->binaryCacheDir + "/" + path;
         static std::atomic<int> counter{0};
         Path tmp = fmt("%s.tmp.%d.%d", path2, getpid(), ++counter);
         AutoDelete del(tmp, false);
-        StreamToSourceAdapter source(istream);
         writeFile(tmp, source);
         std::filesystem::rename(tmp, path2);
         del.cancel();

src/libstore/s3-binary-cache-store.cc

@@ -20,11 +20,8 @@ public:
     {
     }
 
-    void upsertFile(
+    void
-        const std::string & path,
+    upsertFile(const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint) override;
-        std::shared_ptr<std::basic_iostream<char>> istream,
-        const std::string & mimeType,
-        uint64_t sizeHint) override;
 
 private:
     ref<S3BinaryCacheStoreConfig> s3Config;
@@ -70,12 +67,9 @@ private:
 };
 
 void S3BinaryCacheStore::upsertFile(
-    const std::string & path,
+    const std::string & path, Source & source, const std::string & mimeType, uint64_t sizeHint)
-    std::shared_ptr<std::basic_iostream<char>> istream,
-    const std::string & mimeType,
-    uint64_t sizeHint)
 {
-    HttpBinaryCacheStore::upsertFile(path, istream, mimeType, sizeHint);
+    HttpBinaryCacheStore::upsertFile(path, source, mimeType, sizeHint);
 }
 
 std::string S3BinaryCacheStore::createMultipartUpload(