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Refactor downloadCached() interface

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This commit is contained in:
Eelco Dolstra 2019-05-22 23:36:29 +02:00
parent 66f1d7ee95
commit df3f5a78d5
7 changed files with 73 additions and 54 deletions
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44
src/libstore/download.cc
View file

@ -319,10 +319,10 @@ struct CurlDownloader : public Downloader
long httpStatus = 0;
curl_easy_getinfo(req, CURLINFO_RESPONSE_CODE, &httpStatus);
char * effectiveUrlCStr;
curl_easy_getinfo(req, CURLINFO_EFFECTIVE_URL, &effectiveUrlCStr);
if (effectiveUrlCStr)
result.effectiveUrl = effectiveUrlCStr;
char * effectiveUriCStr;
curl_easy_getinfo(req, CURLINFO_EFFECTIVE_URL, &effectiveUriCStr);
if (effectiveUriCStr)
result.effectiveUri = effectiveUriCStr;
debug("finished %s of '%s'; curl status = %d, HTTP status = %d, body = %d bytes",
request.verb(), request.uri, code, httpStatus, result.bodySize);
@ -790,18 +790,20 @@ void Downloader::download(DownloadRequest && request, Sink & sink)
}
}
CachedDownloadResult Downloader::downloadCached(ref<Store> store, const string & url_, bool unpack, string name, const Hash & expectedHash, string * effectiveUrl, int ttl)
CachedDownloadResult Downloader::downloadCached(
ref<Store> store, const CachedDownloadRequest & request)
{
auto url = resolveUri(url_);
auto url = resolveUri(request.uri);
auto name = request.name;
if (name == "") {
auto p = url.rfind('/');
if (p != string::npos) name = string(url, p + 1);
}
Path expectedStorePath;
if (expectedHash) {
expectedStorePath = store->makeFixedOutputPath(unpack, expectedHash, name);
if (request.expectedHash) {
expectedStorePath = store->makeFixedOutputPath(request.unpack, request.expectedHash, name);
if (store->isValidPath(expectedStorePath)) {
CachedDownloadResult result;
result.storePath = expectedStorePath;
@ -835,10 +837,9 @@ CachedDownloadResult Downloader::downloadCached(ref<Store> store, const string &
auto ss = tokenizeString<vector<string>>(readFile(dataFile), "\n");
if (ss.size() >= 3 && ss[0] == url) {
time_t lastChecked;
if (string2Int(ss[2], lastChecked) && lastChecked + ttl >= time(0)) {
if (string2Int(ss[2], lastChecked) && lastChecked + request.ttl >= time(0)) {
skip = true;
if (effectiveUrl)
*effectiveUrl = url_;
result.effectiveUri = request.uri;
result.etag = ss[1];
} else if (!ss[1].empty()) {
debug(format("verifying previous ETag '%1%'") % ss[1]);
@ -852,18 +853,17 @@ CachedDownloadResult Downloader::downloadCached(ref<Store> store, const string &
if (!skip) {
try {
DownloadRequest request(url);
request.expectedETag = expectedETag;
auto res = download(request);
if (effectiveUrl)
*effectiveUrl = res.effectiveUrl;
DownloadRequest request2(url);
request2.expectedETag = expectedETag;
auto res = download(request2);
result.effectiveUri = res.effectiveUri;
result.etag = res.etag;
if (!res.cached) {
ValidPathInfo info;
StringSink sink;
dumpString(*res.data, sink);
Hash hash = hashString(expectedHash ? expectedHash.type : htSHA256, *res.data);
Hash hash = hashString(request.expectedHash ? request.expectedHash.type : htSHA256, *res.data);
info.path = store->makeFixedOutputPath(false, hash, name);
info.narHash = hashString(htSHA256, *sink.s);
info.narSize = sink.s->size();
@ -883,7 +883,7 @@ CachedDownloadResult Downloader::downloadCached(ref<Store> store, const string &
}
}
if (unpack) {
if (request.unpack) {
Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked";
PathLocks lock2({unpackedLink}, fmt("waiting for lock on '%1%'...", unpackedLink));
Path unpackedStorePath;
@ -906,11 +906,11 @@ CachedDownloadResult Downloader::downloadCached(ref<Store> store, const string &
}
if (expectedStorePath != "" && storePath != expectedStorePath) {
Hash gotHash = unpack
? hashPath(expectedHash.type, store->toRealPath(storePath)).first
: hashFile(expectedHash.type, store->toRealPath(storePath));
Hash gotHash = request.unpack
? hashPath(request.expectedHash.type, store->toRealPath(storePath)).first
: hashFile(request.expectedHash.type, store->toRealPath(storePath));
throw nix::Error("hash mismatch in file downloaded from '%s':\n wanted: %s\n got: %s",
url, expectedHash.to_string(), gotHash.to_string());
url, request.expectedHash.to_string(), gotHash.to_string());
}
result.storePath = storePath;

20
src/libstore/download.hh
View file

@ -36,11 +36,23 @@ struct DownloadResult
{
bool cached = false;
std::string etag;
std::string effectiveUrl;
std::string effectiveUri;
std::shared_ptr<std::string> data;
uint64_t bodySize = 0;
};
struct CachedDownloadRequest
{
std::string uri;
bool unpack = false;
std::string name;
Hash expectedHash;
unsigned int ttl = settings.tarballTtl;
CachedDownloadRequest(const std::string & uri)
: uri(uri) { }
};
struct CachedDownloadResult
{
// Note: 'storePath' may be different from 'path' when using a
@ -48,6 +60,7 @@ struct CachedDownloadResult
Path storePath;
Path path;
std::optional<std::string> etag;
std::string effectiveUri;
};
class Store;
@ -73,10 +86,7 @@ struct Downloader
and is more recent than ‘tarball-ttl’ seconds. Otherwise,
use the recorded ETag to verify if the server has a more
recent version, and if so, download it to the Nix store. */
CachedDownloadResult downloadCached(
ref<Store> store, const string & uri, bool unpack, string name = "",
const Hash & expectedHash = Hash(), string * effectiveUri = nullptr,
int ttl = settings.tarballTtl);
CachedDownloadResult downloadCached(ref<Store> store, const CachedDownloadRequest & request);
enum Error { NotFound, Forbidden, Misc, Transient, Interrupted };
};