forked from lix-project/lix
66adbdfd97
This makes us more robust against 500 errors from CloudFront or S3 (assuming the 500 error isn't cached by CloudFront...).
110 lines
3 KiB
C++
110 lines
3 KiB
C++
#include "binary-cache-store.hh"
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#include "download.hh"
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#include "globals.hh"
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#include "nar-info-disk-cache.hh"
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namespace nix {
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MakeError(UploadToHTTP, Error);
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class HttpBinaryCacheStore : public BinaryCacheStore
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{
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private:
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Path cacheUri;
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Pool<Downloader> downloaders;
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public:
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HttpBinaryCacheStore(
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const Params & params, const Path & _cacheUri)
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: BinaryCacheStore(params)
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, cacheUri(_cacheUri)
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, downloaders(
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std::numeric_limits<size_t>::max(),
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[]() { return makeDownloader(); })
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{
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if (cacheUri.back() == '/')
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cacheUri.pop_back();
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diskCache = getNarInfoDiskCache();
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}
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std::string getUri() override
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{
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return cacheUri;
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}
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void init() override
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{
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// FIXME: do this lazily?
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if (!diskCache->cacheExists(cacheUri, wantMassQuery_, priority)) {
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try {
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BinaryCacheStore::init();
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} catch (UploadToHTTP &) {
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throw Error(format("‘%s’ does not appear to be a binary cache") % cacheUri);
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}
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diskCache->createCache(cacheUri, storeDir, wantMassQuery_, priority);
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}
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}
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protected:
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bool fileExists(const std::string & path) override
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{
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try {
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auto downloader(downloaders.get());
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DownloadOptions options;
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options.showProgress = DownloadOptions::no;
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options.head = true;
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options.tries = 5;
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downloader->download(cacheUri + "/" + path, options);
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return true;
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} catch (DownloadError & e) {
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/* S3 buckets return 403 if a file doesn't exist and the
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bucket is unlistable, so treat 403 as 404. */
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if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
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return false;
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throw;
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}
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}
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void upsertFile(const std::string & path, const std::string & data) override
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{
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throw UploadToHTTP("uploading to an HTTP binary cache is not supported");
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}
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std::shared_ptr<std::string> getFile(const std::string & path) override
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{
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auto downloader(downloaders.get());
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DownloadOptions options;
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options.showProgress = DownloadOptions::no;
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options.tries = 3;
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try {
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return downloader->download(cacheUri + "/" + path, options).data;
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} catch (DownloadError & e) {
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if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
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return 0;
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throw;
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}
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}
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};
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static RegisterStoreImplementation regStore([](
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const std::string & uri, const Store::Params & params)
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-> std::shared_ptr<Store>
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{
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if (std::string(uri, 0, 7) != "http://" &&
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std::string(uri, 0, 8) != "https://" &&
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(getEnv("_NIX_FORCE_HTTP_BINARY_CACHE_STORE") != "1" || std::string(uri, 0, 7) != "file://")
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) return 0;
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auto store = std::make_shared<HttpBinaryCacheStore>(params, uri);
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store->init();
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return store;
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});
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}
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