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#include <utility>
#include <glog/logging.h>
#include "libstore/binary-cache-store.hh"
#include "libstore/download.hh"
#include "libstore/globals.hh"
#include "libstore/nar-info-disk-cache.hh"
namespace nix {
MakeError(UploadToHTTP, Error);
class HttpBinaryCacheStore : public BinaryCacheStore {
private:
Path cacheUri;
struct State {
bool enabled = true;
std::chrono::steady_clock::time_point disabledUntil;
};
Sync<State> _state;
public:
HttpBinaryCacheStore(const Params& params, Path _cacheUri)
: BinaryCacheStore(params), cacheUri(std::move(_cacheUri)) {
if (cacheUri.back() == '/') {
cacheUri.pop_back();
}
diskCache = getNarInfoDiskCache();
}
std::string getUri() override { return cacheUri; }
void init() override {
// FIXME: do this lazily?
if (!diskCache->cacheExists(cacheUri, wantMassQuery_, priority)) {
try {
BinaryCacheStore::init();
} catch (UploadToHTTP&) {
throw Error("'%s' does not appear to be a binary cache", cacheUri);
}
diskCache->createCache(cacheUri, storeDir, wantMassQuery_, priority);
}
}
protected:
void maybeDisable() {
auto state(_state.lock());
if (state->enabled && settings.tryFallback) {
int t = 60;
LOG(WARNING) << "disabling binary cache '" << getUri() << "' for " << t
<< " seconds";
state->enabled = false;
state->disabledUntil =
std::chrono::steady_clock::now() + std::chrono::seconds(t);
}
}
void checkEnabled() {
auto state(_state.lock());
if (state->enabled) {
return;
}
if (std::chrono::steady_clock::now() > state->disabledUntil) {
state->enabled = true;
DLOG(INFO) << "re-enabling binary cache '" << getUri() << "'";
return;
}
throw SubstituterDisabled("substituter '%s' is disabled", getUri());
}
bool fileExists(const std::string& path) override {
checkEnabled();
try {
DownloadRequest request(cacheUri + "/" + path);
request.head = true;
getDownloader()->download(request);
return true;
} catch (DownloadError& e) {
/* S3 buckets return 403 if a file doesn't exist and the
bucket is unlistable, so treat 403 as 404. */
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden) {
return false;
}
maybeDisable();
throw;
}
}
void upsertFile(const std::string& path, const std::string& data,
const std::string& mimeType) override {
auto req = DownloadRequest(cacheUri + "/" + path);
req.data = std::make_shared<std::string>(data); // FIXME: inefficient
req.mimeType = mimeType;
try {
getDownloader()->download(req);
} catch (DownloadError& e) {
throw UploadToHTTP("while uploading to HTTP binary cache at '%s': %s",
cacheUri, e.msg());
}
}
DownloadRequest makeRequest(const std::string& path) {
DownloadRequest request(cacheUri + "/" + path);
return request;
}
void getFile(const std::string& path, Sink& sink) override {
checkEnabled();
auto request(makeRequest(path));
try {
getDownloader()->download(std::move(request), sink);
} catch (DownloadError& e) {
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden) {
throw NoSuchBinaryCacheFile(
"file '%s' does not exist in binary cache '%s'", path, getUri());
}
maybeDisable();
throw;
}
}
void getFile(
const std::string& path,
Callback<std::shared_ptr<std::string>> callback) noexcept override {
checkEnabled();
auto request(makeRequest(path));
auto callbackPtr =
std::make_shared<decltype(callback)>(std::move(callback));
getDownloader()->enqueueDownload(
request,
Callback<DownloadResult>{
[callbackPtr, this](std::future<DownloadResult> result) {
try {
(*callbackPtr)(result.get().data);
} catch (DownloadError& e) {
if (e.error == Downloader::NotFound ||
e.error == Downloader::Forbidden) {
return (*callbackPtr)(std::shared_ptr<std::string>());
}
maybeDisable();
callbackPtr->rethrow();
} catch (...) {
callbackPtr->rethrow();
}
}});
}
};
static RegisterStoreImplementation regStore(
[](const std::string& uri,
const Store::Params& params) -> std::shared_ptr<Store> {
if (std::string(uri, 0, 7) != "http://" &&
std::string(uri, 0, 8) != "https://" &&
(getEnv("_NIX_FORCE_HTTP_BINARY_CACHE_STORE") != "1" ||
std::string(uri, 0, 7) != "file://")) {
return nullptr;
}
auto store = std::make_shared<HttpBinaryCacheStore>(params, uri);
store->init();
return store;
});
} // namespace nix
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