Add an S3-backed binary cache store

src/hydra-queue-runner/s3-binary-cache-store.hh

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "binary-cache-store.hh"
+
+namespace Aws { namespace Client { class ClientConfiguration; } }
+namespace Aws { namespace S3 { class S3Client; } }
+
+namespace nix {
+
+class S3BinaryCacheStore : public BinaryCacheStore
+{
+private:
+
+    std::string bucketName;
+
+    ref<Aws::Client::ClientConfiguration> config;
+    ref<Aws::S3::S3Client> client;
+
+public:
+
+    S3BinaryCacheStore(ref<Store> localStore,
+        const Path & secretKeyFile, const Path & publicKeyFile,
+        const std::string & bucketName);
+
+    void init() override;
+
+private:
+
+    ref<Aws::Client::ClientConfiguration> makeConfig();
+
+protected:
+
+    bool fileExists(const std::string & path) override;
+
+    void upsertFile(const std::string & path, const std::string & data) override;
+
+    std::string getFile(const std::string & path) override;
+
+};
+
+}