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Implement a TTL on cached fetchurl/fetchTarball results

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This is because we don't want to do HTTP requests on every evaluation,
even though we can prevent a full redownload via the cached ETag. The
default is one hour.
This commit is contained in:
Eelco Dolstra 2015-04-09 11:55:36 +02:00
parent 60340ce3e2
commit c1f04fae35
3 changed files with 34 additions and 13 deletions
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37
src/libexpr/primops.cc
View file

@ -1631,14 +1631,22 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
string expectedETag;
int ttl = settings.get("tarball-ttl", 60 * 60);
bool skip = false;
if (pathExists(fileLink) && pathExists(dataFile)) {
storePath = readLink(fileLink);
store->addTempRoot(storePath);
if (store->isValidPath(storePath)) {
auto ss = tokenizeString<vector<string>>(readFile(dataFile), "\n");
if (ss.size() >= 2 && ss[0] == url) {
printMsg(lvlDebug, format("verifying previous ETag ‘%1%’") % ss[1]);
expectedETag = ss[1];
if (ss.size() >= 3 && ss[0] == url) {
time_t lastChecked;
if (string2Int(ss[2], lastChecked) && lastChecked + ttl >= time(0))
skip = true;
else if (!ss[1].empty()) {
printMsg(lvlDebug, format("verifying previous ETag ‘%1%’") % ss[1]);
expectedETag = ss[1];
}
}
} else
storePath = "";
@ -1648,19 +1656,22 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
auto p = url.rfind('/');
if (p != string::npos) name = string(url, p + 1);
if (expectedETag.empty())
printMsg(lvlInfo, format("downloading ‘%1%’...") % url);
else
printMsg(lvlInfo, format("checking ‘%1%’...") % url);
Curl curl;
if (!skip) {
if (curl.fetch(url, expectedETag))
storePath = store->addTextToStore(name, curl.data, PathSet(), state.repair);
if (expectedETag.empty())
printMsg(lvlInfo, format("downloading ‘%1%’...") % url);
else
printMsg(lvlInfo, format("checking ‘%1%’...") % url);
Curl curl;
assert(!storePath.empty());
replaceSymlink(storePath, fileLink);
if (curl.fetch(url, expectedETag))
storePath = store->addTextToStore(name, curl.data, PathSet(), state.repair);
writeFile(dataFile, url + "\n" + curl.etag + "\n");
assert(!storePath.empty());
replaceSymlink(storePath, fileLink);
writeFile(dataFile, url + "\n" + curl.etag + "\n" + int2String(time(0)) + "\n");
}
if (unpack) {
Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked";

8
src/libstore/globals.cc
View file

@ -143,6 +143,14 @@ bool Settings::get(const string & name, bool def)
}
int Settings::get(const string & name, int def)
{
int res = def;
_get(res, name);
return res;
}
void Settings::update()
{
_get(tryFallback, "build-fallback");

2
src/libstore/globals.hh
View file

@ -27,6 +27,8 @@ struct Settings {
bool get(const string & name, bool def);
int get(const string & name, int def);
void update();
string pack();