Simplify the callback mechanism

16 files changed, 151 insertions, 179 deletions

diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 2e9a13e564..45be490765 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -58,12 +58,13 @@ 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);
-        });
+        {[&](std::future<std::shared_ptr<std::string>> result) {
+            try {
+                promise.set_value(result.get());
+            } catch (...) {
+                promise.set_exception(std::current_exception());
+            }
+        }});
     return promise.get_future().get();
 }
 
@@ -218,8 +219,7 @@ void BinaryCacheStore::narFromPath(const Path & storePath, Sink & sink)
 }
 
 void BinaryCacheStore::queryPathInfoUncached(const Path & storePath,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure)
+    Callback<std::shared_ptr<ValidPathInfo>> callback)
 {
     auto uri = getUri();
     auto act = std::make_shared<Activity>(*logger, lvlTalkative, actQueryPathInfo,
@@ -229,17 +229,22 @@ void BinaryCacheStore::queryPathInfoUncached(const Path & storePath,
     auto narInfoFile = narInfoFileFor(storePath);
 
     getFile(narInfoFile,
-        [=](std::shared_ptr<std::string> data) {
-            if (!data) return success(0);
+        {[=](std::future<std::shared_ptr<std::string>> fut) {
+            try {
+                auto data = fut.get();
+
+                if (!data) return callback(nullptr);
 
-            stats.narInfoRead++;
+                stats.narInfoRead++;
 
-            callSuccess(success, failure, (std::shared_ptr<ValidPathInfo>)
-                std::make_shared<NarInfo>(*this, *data, narInfoFile));
+                callback((std::shared_ptr<ValidPathInfo>)
+                    std::make_shared<NarInfo>(*this, *data, narInfoFile));
 
-            (void) act; // force Activity into this lambda to ensure it stays alive
-        },
-        failure);
+                (void) act; // force Activity into this lambda to ensure it stays alive
+            } catch (...) {
+                callback.rethrow();
+            }
+        }});
 }
 
 Path BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/binary-cache-store.hh
index e20b968442..fcde666bee 100644
--- a/src/libstore/binary-cache-store.hh
+++ b/src/libstore/binary-cache-store.hh
@@ -41,8 +41,7 @@ public:
     /* Return the contents of the specified file, or null if it
        doesn't exist. */
     virtual void getFile(const std::string & path,
-        std::function<void(std::shared_ptr<std::string>)> success,
-        std::function<void(std::exception_ptr exc)> failure) = 0;
+        Callback<std::shared_ptr<std::string>> callback) = 0;
 
     std::shared_ptr<std::string> getFile(const std::string & path);
 
@@ -71,8 +70,7 @@ public:
     { unsupported(); }
 
     void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) override;
+        Callback<std::shared_ptr<ValidPathInfo>> callback) override;
 
     void queryReferrers(const Path & path,
         PathSet & referrers) override
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index fce701a15a..afb066e146 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -81,8 +81,7 @@ struct CurlDownloader : public Downloader
         DownloadResult result;
         Activity act;
         bool done = false; // whether either the success or failure function has been called
-        std::function<void(const DownloadResult &)> success;
-        std::function<void(std::exception_ptr exc)> failure;
+        Callback<DownloadResult> callback;
         CURL * req = 0;
         bool active = false; // whether the handle has been added to the multi object
         std::string status;
@@ -97,10 +96,13 @@ struct CurlDownloader : public Downloader
 
         std::string encoding;
 
-        DownloadItem(CurlDownloader & downloader, const DownloadRequest & request)
+        DownloadItem(CurlDownloader & downloader,
+            const DownloadRequest & request,
+            Callback<DownloadResult> callback)
             : downloader(downloader)
             , request(request)
             , act(*logger, lvlTalkative, actDownload, fmt("downloading '%s'", request.uri), {request.uri}, request.parentAct)
+            , callback(callback)
         {
             if (!request.expectedETag.empty())
                 requestHeaders = curl_slist_append(requestHeaders, ("If-None-Match: " + request.expectedETag).c_str());
@@ -129,7 +131,7 @@ struct CurlDownloader : public Downloader
         {
             assert(!done);
             done = true;
-            callFailure(failure, std::make_exception_ptr(e));
+            callback.rethrow(std::make_exception_ptr(e));
         }
 
         size_t writeCallback(void * contents, size_t size, size_t nmemb)
@@ -316,11 +318,11 @@ struct CurlDownloader : public Downloader
                 try {
                     if (request.decompress)
                         result.data = decodeContent(encoding, ref<std::string>(result.data));
-                    callSuccess(success, failure, const_cast<const DownloadResult &>(result));
                     act.progress(result.data->size(), result.data->size());
+                    callback(std::move(result));
                 } catch (...) {
                     done = true;
-                    callFailure(failure, std::current_exception());
+                    callback.rethrow();
                 }
             } else {
                 // We treat most errors as transient, but won't retry when hopeless
@@ -570,13 +572,12 @@ struct CurlDownloader : public Downloader
     }
 
     void enqueueDownload(const DownloadRequest & request,
-        std::function<void(const DownloadResult &)> success,
-        std::function<void(std::exception_ptr exc)> failure) override
+        Callback<DownloadResult> callback) override
     {
         /* Ugly hack to support s3:// URIs. */
         if (hasPrefix(request.uri, "s3://")) {
             // FIXME: do this on a worker thread
-            sync2async<DownloadResult>(success, failure, [&]() -> DownloadResult {
+            try {
 #ifdef ENABLE_S3
                 S3Helper s3Helper("", Aws::Region::US_EAST_1); // FIXME: make configurable
                 auto slash = request.uri.find('/', 5);
@@ -590,18 +591,15 @@ struct CurlDownloader : public Downloader
                 if (!s3Res.data)
                     throw DownloadError(NotFound, fmt("S3 object '%s' does not exist", request.uri));
                 res.data = s3Res.data;
-                return res;
+                callback(std::move(res));
 #else
                 throw nix::Error("cannot download '%s' because Nix is not built with S3 support", request.uri);
 #endif
-            });
+            } catch (...) { callback.rethrow(); }
             return;
         }
 
-        auto item = std::make_shared<DownloadItem>(*this, request);
-        item->success = success;
-        item->failure = failure;
-        enqueueItem(item);
+        enqueueItem(std::make_shared<DownloadItem>(*this, request, callback));
     }
 };
 
@@ -622,8 +620,13 @@ std::future<DownloadResult> Downloader::enqueueDownload(const DownloadRequest &
 {
     auto promise = std::make_shared<std::promise<DownloadResult>>();
     enqueueDownload(request,
-        [promise](const DownloadResult & result) { promise->set_value(result); },
-        [promise](std::exception_ptr exc) { promise->set_exception(exc); });
+        {[promise](std::future<DownloadResult> fut) {
+            try {
+                promise->set_value(fut.get());
+            } catch (...) {
+                promise->set_exception(std::current_exception());
+            }
+        }});
     return promise->get_future();
 }
 
diff --git a/src/libstore/download.hh b/src/libstore/download.hh
index 7ade756fc3..01940f5447 100644
--- a/src/libstore/download.hh
+++ b/src/libstore/download.hh
@@ -42,8 +42,7 @@ struct Downloader
        the download. The future may throw a DownloadError
        exception. */
     virtual void enqueueDownload(const DownloadRequest & request,
-        std::function<void(const DownloadResult &)> success,
-        std::function<void(std::exception_ptr exc)> failure) = 0;
+        Callback<DownloadResult> callback) = 0;
 
     std::future<DownloadResult> enqueueDownload(const DownloadRequest & request);
 
diff --git a/src/libstore/http-binary-cache-store.cc b/src/libstore/http-binary-cache-store.cc
index b9e9cd5dab..b8d670417a 100644
--- a/src/libstore/http-binary-cache-store.cc
+++ b/src/libstore/http-binary-cache-store.cc
@@ -78,27 +78,23 @@ protected:
     }
 
     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
     {
         DownloadRequest request(cacheUri + "/" + path);
         request.tries = 8;
 
         getDownloader()->enqueueDownload(request,
-            [success](const DownloadResult & result) {
-                success(result.data);
-            },
-            [success, failure](std::exception_ptr exc) {
+            {[callback](std::future<DownloadResult> result) {
                 try {
-                    std::rethrow_exception(exc);
+                    callback(result.get().data);
                 } catch (DownloadError & e) {
                     if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
-                        return success(0);
-                    failure(exc);
+                        return callback(std::shared_ptr<std::string>());
+                    callback.rethrow();
                 } catch (...) {
-                    failure(exc);
+                    callback.rethrow();
                 }
-            });
+            }});
     }
 
 };
diff --git a/src/libstore/legacy-ssh-store.cc b/src/libstore/legacy-ssh-store.cc
index 5dee25308f..02d91ded04 100644
--- a/src/libstore/legacy-ssh-store.cc
+++ b/src/libstore/legacy-ssh-store.cc
@@ -84,10 +84,9 @@ struct LegacySSHStore : public Store
     }
 
     void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) override
+        Callback<std::shared_ptr<ValidPathInfo>> callback) override
     {
-        sync2async<std::shared_ptr<ValidPathInfo>>(success, failure, [&]() -> std::shared_ptr<ValidPathInfo> {
+        try {
             auto conn(connections->get());
 
             debug("querying remote host '%s' for info on '%s'", host, path);
@@ -97,7 +96,7 @@ struct LegacySSHStore : public Store
 
             auto info = std::make_shared<ValidPathInfo>();
             conn->from >> info->path;
-            if (info->path.empty()) return nullptr;
+            if (info->path.empty()) return callback(nullptr);
             assert(path == info->path);
 
             PathSet references;
@@ -116,8 +115,8 @@ struct LegacySSHStore : public Store
             auto s = readString(conn->from);
             assert(s == "");
 
-            return info;
-        });
+            callback(std::move(info));
+        } catch (...) { callback.rethrow(); }
     }
 
     void addToStore(const ValidPathInfo & info, Source & source,
diff --git a/src/libstore/local-binary-cache-store.cc b/src/libstore/local-binary-cache-store.cc
index 2577e90aef..ae0ffa6a56 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
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 681abafef2..3b2ba65f3b 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -629,17 +629,15 @@ uint64_t LocalStore::addValidPath(State & state,
 
 
 void LocalStore::queryPathInfoUncached(const Path & path,
-    std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-    std::function<void(std::exception_ptr exc)> failure)
+    Callback<std::shared_ptr<ValidPathInfo>> callback)
 {
-    sync2async<std::shared_ptr<ValidPathInfo>>(success, failure, [&]() {
-
+    try {
         auto info = std::make_shared<ValidPathInfo>();
         info->path = path;
 
         assertStorePath(path);
 
-        return retrySQLite<std::shared_ptr<ValidPathInfo>>([&]() {
+        callback(retrySQLite<std::shared_ptr<ValidPathInfo>>([&]() {
             auto state(_state.lock());
 
             /* Get the path info. */
@@ -679,8 +677,9 @@ void LocalStore::queryPathInfoUncached(const Path & path,
                 info->references.insert(useQueryReferences.getStr(0));
 
             return info;
-        });
-    });
+        }));
+
+    } catch (...) { callback.rethrow(); }
 }
 
 
diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index 1209a06356..746bdbeed7 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -127,8 +127,7 @@ public:
     PathSet queryAllValidPaths() override;
 
     void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) override;
+        Callback<std::shared_ptr<ValidPathInfo>> callback) override;
 
     void queryReferrers(const Path & path, PathSet & referrers) override;
 
diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index a82aa4e9cf..adcce026fa 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -33,9 +33,11 @@ void Store::computeFSClosure(const PathSet & startPaths,
             state->pending++;
         }
 
-        queryPathInfo(path,
-            [&, path](ref<ValidPathInfo> info) {
-                // FIXME: calls to isValidPath() should be async
+        queryPathInfo(path, {[&, path](std::future<ref<ValidPathInfo>> fut) {
+            // FIXME: calls to isValidPath() should be async
+
+            try {
+                auto info = fut.get();
 
                 if (flipDirection) {
 
@@ -75,14 +77,13 @@ void Store::computeFSClosure(const PathSet & startPaths,
                     if (!--state->pending) done.notify_one();
                 }
 
-            },
-
-            [&, path](std::exception_ptr exc) {
+            } catch (...) {
                 auto state(state_.lock());
-                if (!state->exc) state->exc = exc;
+                if (!state->exc) state->exc = std::current_exception();
                 assert(state->pending);
                 if (!--state->pending) done.notify_one();
-            });
+            };
+        }});
     };
 
     for (auto & startPath : startPaths)
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index a157c6c485..b72c940cdc 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -294,10 +294,9 @@ void RemoteStore::querySubstitutablePathInfos(const PathSet & paths,
 
 
 void RemoteStore::queryPathInfoUncached(const Path & path,
-    std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-    std::function<void(std::exception_ptr exc)> failure)
+    Callback<std::shared_ptr<ValidPathInfo>> callback)
 {
-    sync2async<std::shared_ptr<ValidPathInfo>>(success, failure, [&]() {
+    try {
         auto conn(connections->get());
         conn->to << wopQueryPathInfo << path;
         try {
@@ -324,8 +323,8 @@ void RemoteStore::queryPathInfoUncached(const Path & path,
             info->sigs = readStrings<StringSet>(conn->from);
             conn->from >> info->ca;
         }
-        return info;
-    });
+        callback(std::move(info));
+    } catch (...) { callback.rethrow(); }
 }
 
 
diff --git a/src/libstore/remote-store.hh b/src/libstore/remote-store.hh
index 95fa59a206..b488e34ce2 100644
--- a/src/libstore/remote-store.hh
+++ b/src/libstore/remote-store.hh
@@ -40,8 +40,7 @@ public:
     PathSet queryAllValidPaths() override;
 
     void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) override;
+        Callback<std::shared_ptr<ValidPathInfo>> callback) override;
 
     void queryReferrers(const Path & path, PathSet & referrers) override;
 
diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
index 103f141a1a..f2e8efc16e 100644
--- a/src/libstore/s3-binary-cache-store.cc
+++ b/src/libstore/s3-binary-cache-store.cc
@@ -365,10 +365,9 @@ struct S3BinaryCacheStoreImpl : public S3BinaryCacheStore
     }
 
     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 {
             stats.get++;
 
             auto res = s3Helper.getObject(bucketName, path);
@@ -380,8 +379,8 @@ struct S3BinaryCacheStoreImpl : public S3BinaryCacheStore
                 printTalkative("downloaded 's3://%s/%s' (%d bytes) in %d ms",
                     bucketName, path, res.data->size(), res.durationMs);
 
-            return res.data;
-        });
+            callback(std::move(res.data));
+        } catch (...) { callback.rethrow(); }
     }
 
     PathSet queryAllValidPaths() override
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 49b32d1158..9b0b7d6327 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -305,20 +305,20 @@ ref<const ValidPathInfo> Store::queryPathInfo(const Path & storePath)
     std::promise<ref<ValidPathInfo>> promise;
 
     queryPathInfo(storePath,
-        [&](ref<ValidPathInfo> info) {
-            promise.set_value(info);
-        },
-        [&](std::exception_ptr exc) {
-            promise.set_exception(exc);
-        });
+        {[&](std::future<ref<ValidPathInfo>> result) {
+            try {
+                promise.set_value(result.get());
+            } catch (...) {
+                promise.set_exception(std::current_exception());
+            }
+        }});
 
     return promise.get_future().get();
 }
 
 
 void Store::queryPathInfo(const Path & storePath,
-    std::function<void(ref<ValidPathInfo>)> success,
-    std::function<void(std::exception_ptr exc)> failure)
+    Callback<ref<ValidPathInfo>> callback)
 {
     auto hashPart = storePathToHash(storePath);
 
@@ -330,7 +330,7 @@ void Store::queryPathInfo(const Path & storePath,
                 stats.narInfoReadAverted++;
                 if (!*res)
                     throw InvalidPath(format("path '%s' is not valid") % storePath);
-                return success(ref<ValidPathInfo>(*res));
+                return callback(ref<ValidPathInfo>(*res));
             }
         }
 
@@ -346,35 +346,36 @@ void Store::queryPathInfo(const Path & storePath,
                         (res.second->path != storePath && storePathToName(storePath) != ""))
                         throw InvalidPath(format("path '%s' is not valid") % storePath);
                 }
-                return success(ref<ValidPathInfo>(res.second));
+                return callback(ref<ValidPathInfo>(res.second));
             }
         }
 
-    } catch (std::exception & e) {
-        return callFailure(failure);
-    }
+    } catch (...) { return callback.rethrow(); }
 
     queryPathInfoUncached(storePath,
-        [this, storePath, hashPart, success, failure](std::shared_ptr<ValidPathInfo> info) {
+        {[this, storePath, hashPart, callback](std::future<std::shared_ptr<ValidPathInfo>> fut) {
 
-            if (diskCache)
-                diskCache->upsertNarInfo(getUri(), hashPart, info);
+            try {
+                auto info = fut.get();
 
-            {
-                auto state_(state.lock());
-                state_->pathInfoCache.upsert(hashPart, info);
-            }
+                if (diskCache)
+                    diskCache->upsertNarInfo(getUri(), hashPart, info);
 
-            if (!info
-                || (info->path != storePath && storePathToName(storePath) != ""))
-            {
-                stats.narInfoMissing++;
-                return failure(std::make_exception_ptr(InvalidPath(format("path '%s' is not valid") % storePath)));
-            }
+                {
+                    auto state_(state.lock());
+                    state_->pathInfoCache.upsert(hashPart, info);
+                }
 
-            callSuccess(success, failure, ref<ValidPathInfo>(info));
+                if (!info
+                    || (info->path != storePath && storePathToName(storePath) != ""))
+                {
+                    stats.narInfoMissing++;
+                    throw InvalidPath("path '%s' is not valid", storePath);
+                }
 
-        }, failure);
+                callback(ref<ValidPathInfo>(info));
+            } catch (...) { callback.rethrow(); }
+        }});
 }
 
 
@@ -394,26 +395,19 @@ PathSet Store::queryValidPaths(const PathSet & paths, SubstituteFlag maybeSubsti
 
     auto doQuery = [&](const Path & path ) {
         checkInterrupt();
-        queryPathInfo(path,
-            [path, &state_, &wakeup](ref<ValidPathInfo> info) {
-                auto state(state_.lock());
+        queryPathInfo(path, {[path, &state_, &wakeup](std::future<ref<ValidPathInfo>> fut) {
+            auto state(state_.lock());
+            try {
+                auto info = fut.get();
                 state->valid.insert(path);
-                assert(state->left);
-                if (!--state->left)
-                    wakeup.notify_one();
-            },
-            [path, &state_, &wakeup](std::exception_ptr exc) {
-                auto state(state_.lock());
-                try {
-                    std::rethrow_exception(exc);
-                } catch (InvalidPath &) {
-                } catch (...) {
-                    state->exc = exc;
-                }
-                assert(state->left);
-                if (!--state->left)
-                    wakeup.notify_one();
-            });
+            } catch (InvalidPath &) {
+            } catch (...) {
+                state->exc = std::current_exception();
+            }
+            assert(state->left);
+            if (!--state->left)
+                wakeup.notify_one();
+        }});
     };
 
     for (auto & path : paths)
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index ea259f07e8..6ee2d55067 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -355,14 +355,12 @@ public:
 
     /* Asynchronous version of queryPathInfo(). */
     void queryPathInfo(const Path & path,
-        std::function<void(ref<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure);
+        Callback<ref<ValidPathInfo>> callback);
 
 protected:
 
     virtual void queryPathInfoUncached(const Path & path,
-        std::function<void(std::shared_ptr<ValidPathInfo>)> success,
-        std::function<void(std::exception_ptr exc)> failure) = 0;
+        Callback<std::shared_ptr<ValidPathInfo>> callback) = 0;
 
 public:
 
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 743d238611..215c7cecaf 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -15,6 +15,7 @@
 #include <map>
 #include <sstream>
 #include <experimental/optional>
+#include <future>
 
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #define DT_UNKNOWN 0
@@ -424,44 +425,30 @@ string get(const T & map, const string & key, const string & def = "")
 }
 
 
-/* Call ‘failure’ with the current exception as argument. If ‘failure’
-   throws an exception, abort the program. */
-void callFailure(const std::function<void(std::exception_ptr exc)> & failure,
-    std::exception_ptr exc = std::current_exception());
+/* A callback is a wrapper around a lambda that accepts a valid of
+   type T or an exception. (We abuse std::future<T> to pass the value or
+   exception.) */
+template<typename T>
+struct Callback
+{
+    std::function<void(std::future<T>)> fun;
 
+    Callback(std::function<void(std::future<T>)> fun) : fun(fun) { }
 
-/* Evaluate the function ‘f’. If it returns a value, call ‘success’
-   with that value as its argument. If it or ‘success’ throws an
-   exception, call ‘failure’. If ‘failure’ throws an exception, abort
-   the program. */
-template<class T>
-void sync2async(
-    const std::function<void(T)> & success,
-    const std::function<void(std::exception_ptr exc)> & failure,
-    const std::function<T()> & f)
-{
-    try {
-        success(f());
-    } catch (...) {
-        callFailure(failure);
+    void operator()(T && t) const
+    {
+        std::promise<T> promise;
+        promise.set_value(std::move(t));
+        fun(promise.get_future());
     }
-}
 
-
-/* Call the function ‘success’. If it throws an exception, call
-   ‘failure’. If that throws an exception, abort the program. */
-template<class T>
-void callSuccess(
-    const std::function<void(T)> & success,
-    const std::function<void(std::exception_ptr exc)> & failure,
-    T && arg)
-{
-    try {
-        success(arg);
-    } catch (...) {
-        callFailure(failure);
+    void rethrow(const std::exception_ptr & exc = std::current_exception()) const
+    {
+        std::promise<T> promise;
+        promise.set_exception(exc);
+        fun(promise.get_future());
     }
-}
+};
 
 
 /* Start a thread that handles various signals. Also block those signals