From 81ea8bd5ceb3dcae6af0b79c81a39ecbf2ba97a8 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 27 Mar 2018 22:16:01 +0200
Subject: Simplify the callback mechanism

---
 src/libstore/local-binary-cache-store.cc | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

(limited to 'src/libstore/local-binary-cache-store.cc')

diff --git a/src/libstore/local-binary-cache-store.cc b/src/libstore/local-binary-cache-store.cc
index 2577e90ae..ae0ffa6a5 100644
--- a/src/libstore/local-binary-cache-store.cc
+++ b/src/libstore/local-binary-cache-store.cc
@@ -35,17 +35,14 @@ protected:
         const std::string & mimeType) override;
 
     void getFile(const std::string & path,
-        std::function<void(std::shared_ptr<std::string>)> success,
-        std::function<void(std::exception_ptr exc)> failure) override
+        Callback<std::shared_ptr<std::string>> callback) override
     {
-        sync2async<std::shared_ptr<std::string>>(success, failure, [&]() {
-            try {
-                return std::make_shared<std::string>(readFile(binaryCacheDir + "/" + path));
-            } catch (SysError & e) {
-                if (e.errNo == ENOENT) return std::shared_ptr<std::string>();
-                throw;
-            }
-        });
+        try {
+            // FIXME: O(n) space
+            callback(std::make_shared<std::string>(readFile(binaryCacheDir + "/" + path)));
+        } catch (SysError & e) {
+            if (e.errNo == ENOENT) callback(nullptr); else callback.rethrow();
+        } catch (...) { callback.rethrow(); }
     }
 
     PathSet queryAllValidPaths() override
-- 
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