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#include "http-binary-cache-store.hh"
#include "binary-cache-store.hh"
#include "filetransfer.hh"
#include "globals.hh"
#include "nar-info-disk-cache.hh"
namespace nix {
MakeError(UploadToHTTP, Error);
struct HttpBinaryCacheStoreConfig : virtual BinaryCacheStoreConfig
{
using BinaryCacheStoreConfig::BinaryCacheStoreConfig;
const std::string name() override { return "HTTP Binary Cache Store"; }
std::string doc() override
{
return
#include "http-binary-cache-store.md"
;
}
};
class HttpBinaryCacheStore : public virtual HttpBinaryCacheStoreConfig, public virtual BinaryCacheStore
{
private:
Path cacheUri;
struct State
{
bool enabled = true;
std::chrono::steady_clock::time_point disabledUntil;
};
Sync<State> _state;
public:
HttpBinaryCacheStore(
const std::string & scheme,
const Path & _cacheUri,
const Params & params)
: StoreConfig(params)
, BinaryCacheStoreConfig(params)
, HttpBinaryCacheStoreConfig(params)
, Store(params)
, BinaryCacheStore(params)
, cacheUri(scheme + "://" + _cacheUri)
{
if (cacheUri.back() == '/')
cacheUri.pop_back();
diskCache = getNarInfoDiskCache();
}
std::string getUri() override
{
return cacheUri;
}
void init() override
{
// FIXME: do this lazily?
if (auto cacheInfo = diskCache->upToDateCacheExists(cacheUri)) {
wantMassQuery.setDefault(cacheInfo->wantMassQuery);
priority.setDefault(cacheInfo->priority);
} else {
try {
BinaryCacheStore::init();
} catch (UploadToHTTP &) {
throw Error("'%s' does not appear to be a binary cache", cacheUri);
}
diskCache->createCache(cacheUri, storeDir, wantMassQuery, priority);
}
}
static std::set<std::string> uriSchemes()
{
static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1";
auto ret = std::set<std::string>({"http", "https"});
if (forceHttp) ret.insert("file");
return ret;
}
protected:
void maybeDisable()
{
auto state(_state.lock());
if (state->enabled && settings.tryFallback) {
int t = 60;
printError("disabling binary cache '%s' for %s seconds", getUri(), t);
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;
debug("re-enabling binary cache '%s'", getUri());
return;
}
throw SubstituterDisabled("substituter '%s' is disabled", getUri());
}
bool fileExists(const std::string & path) override
{
checkEnabled();
try {
FileTransferRequest request(makeRequest(path));
request.head = true;
getFileTransfer()->transfer(request);
return true;
} catch (FileTransferError & e) {
/* S3 buckets return 403 if a file doesn't exist and the
bucket is unlistable, so treat 403 as 404. */
if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
return false;
maybeDisable();
throw;
}
}
void upsertFile(const std::string & path,
std::shared_ptr<std::basic_iostream<char>> istream,
const std::string & mimeType) override
{
auto req = makeRequest(path);
req.data = StreamToSourceAdapter(istream).drain();
req.mimeType = mimeType;
try {
getFileTransfer()->transfer(req);
} catch (FileTransferError & e) {
throw UploadToHTTP("while uploading to HTTP binary cache at '%s': %s", cacheUri, e.msg());
}
}
FileTransferRequest makeRequest(const std::string & path)
{
return FileTransferRequest(
path.starts_with("https://") || path.starts_with("http://") || path.starts_with("file://")
? path
: cacheUri + "/" + path);
}
box_ptr<Source> getFile(const std::string & path) override
{
checkEnabled();
auto request(makeRequest(path));
try {
return getFileTransfer()->download(std::move(request));
} catch (FileTransferError & e) {
if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
throw NoSuchBinaryCacheFile("file '%s' does not exist in binary cache '%s'", path, getUri());
maybeDisable();
throw;
}
}
std::optional<std::string> getFileContents(const std::string & path) override
{
checkEnabled();
auto request(makeRequest(path));
try {
return std::move(getFileTransfer()->enqueueFileTransfer(request).get().data);
} catch (FileTransferError & e) {
if (e.error == FileTransfer::NotFound || e.error == FileTransfer::Forbidden)
return {};
maybeDisable();
throw;
}
}
/**
* This isn't actually necessary read only. We support "upsert" now, so we
* have a notion of authentication via HTTP POST/PUT.
*
* For now, we conservatively say we don't know.
*
* \todo try to expose our HTTP authentication status.
*/
std::optional<TrustedFlag> isTrustedClient() override
{
return std::nullopt;
}
};
void registerHttpBinaryCacheStore() {
StoreImplementations::add<HttpBinaryCacheStore, HttpBinaryCacheStoreConfig>();
}
}
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