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libstore: remove FileTransferResult::data

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return it as a separate item in a pair instead. this will let us remove
enqueueDownload() in favor of returning metadata from download() itself

Change-Id: I74fad2ca15f920da1eefabc950c2baa2c360f2ba
This commit is contained in:
eldritch horrors 2024-10-27 18:27:11 +01:00
parent 5cd7055044
commit 982d049d3b
6 changed files with 44 additions and 37 deletions
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7
src/libfetchers/tarball.cc
View file

@ -43,8 +43,9 @@ DownloadFileResult downloadFile(
if (cached)
headers.emplace_back("If-None-Match", getStrAttr(cached->infoAttrs, "etag"));
FileTransferResult res;
std::string data;
try {
res = getFileTransfer()->enqueueDownload(url, headers).get();
std::tie(res, data) = getFileTransfer()->enqueueDownload(url, headers).get();
} catch (FileTransferError & e) {
if (cached) {
warn("%s; using cached version", e.msg());
@ -69,8 +70,8 @@ DownloadFileResult downloadFile(
storePath = std::move(cached->storePath);
} else {
StringSink sink;
sink << dumpString(res.data);
auto hash = hashString(HashType::SHA256, res.data);
sink << dumpString(data);
auto hash = hashString(HashType::SHA256, data);
ValidPathInfo info {
*store,
name,

41
src/libstore/filetransfer.cc
View file

@ -48,9 +48,12 @@ struct curlFileTransfer : public FileTransfer
FileTransferResult result;
Activity act;
std::optional<std::string> uploadData;
std::string downloadData;
bool noBody = false; // \equiv HTTP HEAD, don't download data
bool done = false; // whether either the success or failure function has been called
std::packaged_task<FileTransferResult(std::exception_ptr, FileTransferResult)> callback;
std::packaged_task<
std::pair<FileTransferResult, std::string>(std::exception_ptr, FileTransferResult)>
callback;
std::function<void(TransferItem &, std::string_view data)> dataCallback;
CURL * req = 0;
bool active = false; // whether the handle has been added to the multi object
@ -105,9 +108,9 @@ struct curlFileTransfer : public FileTransfer
{uri}, parentAct)
, uploadData(std::move(uploadData))
, noBody(noBody)
, callback([cb{std::move(callback)}] (std::exception_ptr ex, FileTransferResult r) {
, callback([this, cb{std::move(callback)}] (std::exception_ptr ex, FileTransferResult r) {
cb(ex);
return r;
return std::pair{std::move(r), std::move(downloadData)};
})
, dataCallback(std::move(dataCallback))
{
@ -159,7 +162,7 @@ struct curlFileTransfer : public FileTransfer
writtenToSink += realSize;
dataCallback(*this, {static_cast<const char *>(contents), realSize});
} else {
this->result.data.append(static_cast<const char *>(contents), realSize);
this->downloadData.append(static_cast<const char *>(contents), realSize);
}
return realSize;
@ -183,7 +186,7 @@ struct curlFileTransfer : public FileTransfer
static std::regex statusLine("HTTP/[^ ]+ +[0-9]+(.*)", std::regex::extended | std::regex::icase);
if (std::smatch match; std::regex_match(line, match, statusLine)) {
result.etag = "";
result.data.clear();
downloadData.clear();
bodySize = 0;
statusMsg = trim(match.str(1));
acceptRanges = false;
@ -328,7 +331,7 @@ struct curlFileTransfer : public FileTransfer
if (writtenToSink)
curl_easy_setopt(req, CURLOPT_RESUME_FROM_LARGE, writtenToSink);
result.data.clear();
downloadData.clear();
bodySize = 0;
}
@ -348,8 +351,8 @@ struct curlFileTransfer : public FileTransfer
// wrapping user `callback`s instead is not possible because the
// Callback api expects std::functions, and copying Callbacks is
// not possible due the promises they hold.
if (code == CURLE_OK && !dataCallback && result.data.length() > 0) {
result.data = decompress(encoding, result.data);
if (code == CURLE_OK && !dataCallback && downloadData.length() > 0) {
downloadData = decompress(encoding, downloadData);
}
if (writeException)
@ -417,7 +420,7 @@ struct curlFileTransfer : public FileTransfer
std::optional<std::string> response;
if (!successfulStatuses.count(httpStatus))
response = std::move(result.data);
response = std::move(downloadData);
auto exc =
code == CURLE_ABORTED_BY_CALLBACK && _isInterrupted
? FileTransferError(Interrupted, std::move(response), "%s of '%s' was interrupted", verb(), uri)
@ -657,7 +660,7 @@ struct curlFileTransfer : public FileTransfer
}
#endif
std::future<FileTransferResult>
std::future<std::pair<FileTransferResult, std::string>>
enqueueDownload(const std::string & uri, const Headers & headers = {}) override
{
return enqueueFileTransfer(uri, headers, std::nullopt, false);
@ -668,7 +671,7 @@ struct curlFileTransfer : public FileTransfer
enqueueFileTransfer(uri, headers, std::move(data), false).get();
}
std::future<FileTransferResult> enqueueFileTransfer(
std::future<std::pair<FileTransferResult, std::string>> enqueueFileTransfer(
const std::string & uri,
const Headers & headers,
std::optional<std::string> data,
@ -689,7 +692,7 @@ struct curlFileTransfer : public FileTransfer
);
}
std::future<FileTransferResult> enqueueFileTransfer(
std::future<std::pair<FileTransferResult, std::string>> enqueueFileTransfer(
const std::string & uri,
const Headers & headers,
std::invocable<std::exception_ptr> auto callback,
@ -701,7 +704,9 @@ struct curlFileTransfer : public FileTransfer
/* Ugly hack to support s3:// URIs. */
if (uri.starts_with("s3://")) {
// FIXME: do this on a worker thread
return std::async(std::launch::deferred, [uri]() -> FileTransferResult {
return std::async(
std::launch::deferred,
[uri]() -> std::pair<FileTransferResult, std::string> {
#if ENABLE_S3
auto [bucketName, key, params] = parseS3Uri(uri);
@ -717,12 +722,14 @@ struct curlFileTransfer : public FileTransfer
FileTransferResult res;
if (!s3Res.data)
throw FileTransferError(NotFound, "S3 object '%s' does not exist", uri);
res.data = std::move(*s3Res.data);
return res;
return {res, std::move(*s3Res.data)};
#else
throw nix::Error("cannot download '%s' because Lix is not built with S3 support", uri);
throw nix::Error(
"cannot download '%s' because Lix is not built with S3 support", uri
);
#endif
});
}
);
}
return enqueueItem(std::make_shared<TransferItem>(

3
src/libstore/filetransfer.hh
View file

@ -57,7 +57,6 @@ struct FileTransferResult
bool cached = false;
std::string etag;
std::string effectiveUri;
std::string data;
/* An "immutable" URL for this resource (i.e. one whose contents
will never change), as returned by the `Link: <url>;
rel="immutable"` header. */
@ -74,7 +73,7 @@ struct FileTransfer
* Enqueues a download request, returning a future for the result of
* the download. The future may throw a FileTransferError exception.
*/
virtual std::future<FileTransferResult>
virtual std::future<std::pair<FileTransferResult, std::string>>
enqueueDownload(const std::string & uri, const Headers & headers = {}) = 0;
/**

2
src/libstore/http-binary-cache-store.cc
View file

@ -161,7 +161,7 @@ protected:
checkEnabled();
try {
return std::move(getFileTransfer()->enqueueDownload(makeURI(path)).get().data);
return std::move(getFileTransfer()->enqueueDownload(makeURI(path)).get().second);
} catch (FileTransferError & e) {
if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
return {};

4
src/nix/upgrade-nix.cc
View file

@ -285,11 +285,11 @@ struct CmdUpgradeNix : MixDryRun, EvalCommand
Activity act(*logger, lvlInfo, actUnknown, "querying latest Nix version");
// FIXME: use nixos.org?
auto res = getFileTransfer()->enqueueDownload(storePathsUrl).get();
auto [res, data] = getFileTransfer()->enqueueDownload(storePathsUrl).get();
auto state = std::make_unique<EvalState>(SearchPath{}, store);
auto v = state->allocValue();
state->eval(state->parseExprFromString(res.data, state->rootPath(CanonPath("/no-such-path"))), *v);
state->eval(state->parseExprFromString(data, state->rootPath(CanonPath("/no-such-path"))), *v);
Bindings & bindings(*state->allocBindings(0));
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first;

2
tests/unit/libstore/filetransfer.cc
View file

@ -215,7 +215,7 @@ TEST(FileTransfer, usesIntermediateLinkHeaders)
{"200 ok", "content-length: 1\r\n", [] { return "a"; }},
});
auto ft = makeFileTransfer(0);
auto result = ft->enqueueDownload(fmt("http://[::1]:%d/first", port)).get();
auto [result, _data] = ft->enqueueDownload(fmt("http://[::1]:%d/first", port)).get();
ASSERT_EQ(result.immutableUrl, "http://foo");
}