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Implement simple file caching.

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This commit is contained in:
Henrik Rydgård
2025-01-23 13:28:51 +01:00
parent e4d08407ab
commit 7f877bb16b
9 changed files with 83 additions and 16 deletions
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Common/Net/HTTPRequest.cpp
+44 -2
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@@ -2,6 +2,7 @@
#include "Common/Net/HTTPClient.h"
#include "Common/Net/HTTPNaettRequest.h"
#include "Common/TimeUtil.h"
#include "Common/File/FileUtil.h"
#include "Common/StringUtils.h"
#include "Common/Log.h"
#include "Common/System/OSD.h"
@@ -39,25 +40,66 @@ static bool IsHttpsUrl(std::string_view url) {
return startsWith(url, "https:");
}
Path UrlToCachePath(const Path &cacheDir, std::string_view url) {
std::string fn = "DLCACHE_";
for (auto c : url) {
if (isalnum(c) || c == '.' || c == '-' || c == '_') {
fn.push_back(tolower(c));
} else {
fn.push_back('_');
}
}
return cacheDir / fn;
}
std::shared_ptr<Request> CreateRequest(RequestMethod method, std::string_view url, std::string_view postdata, std::string_view postMime, const Path &outfile, RequestFlags flags, std::string_view name) {
if (IsHttpsUrl(url) && System_GetPropertyBool(SYSPROP_SUPPORTS_HTTPS)) {
#ifndef HTTPS_NOT_AVAILABLE
return std::shared_ptr<Request>(new HTTPSRequest(method, url, postdata, postMime, outfile, flags, name));
return std::make_shared<HTTPSRequest>(method, url, postdata, postMime, outfile, flags, name);
#else
return std::shared_ptr<Request>();
#endif
} else {
return std::shared_ptr<Request>(new HTTPRequest(method, url, postdata, postMime, outfile, flags, name));
return std::make_shared<HTTPRequest>(method, url, postdata, postMime, outfile, flags, name);
}
}
std::shared_ptr<Request> RequestManager::StartDownload(std::string_view url, const Path &outfile, RequestFlags flags, const char *acceptMime) {
std::shared_ptr<Request> dl = CreateRequest(RequestMethod::GET, url, "", "", outfile, flags, "");
if (!cacheDir_.empty() && (flags & RequestFlags::Cached24H)) {
_dbg_assert_(outfile.empty()); // It's automatically replaced below
// Come up with a cache file path.
Path cacheFile = UrlToCachePath(cacheDir_, url);
// TODO: This should be done on the thread, maybe. But let's keep it simple for now.
time_t cacheFileTime;
if (File::GetModifTimeT(cacheFile, &cacheFileTime)) {
time_t now = (time_t)time_now_unix_utc();
if (cacheFileTime > now - 24 * 60 * 60) {
// The file is new enough. Let's construct a fake, already finished download so we don't need
// to modify the calling code.
std::string contents;
if (File::ReadBinaryFileToString(cacheFile, &contents)) {
// All is well, but we've indented a bit much here.
dl.reset(new CachedRequest(RequestMethod::GET, url, "", nullptr, flags, contents));
newDownloads_.push_back(dl);
return dl;
}
}
}
// OK, didn't get it from cache, so let's continue with the download, putting it in the cache.
dl->OverrideOutFile(cacheFile);
dl->AddFlag(RequestFlags::KeepInMemory);
}
if (!userAgent_.empty())
dl->SetUserAgent(userAgent_);
if (acceptMime)
dl->SetAccept(acceptMime);
newDownloads_.push_back(dl);
dl->Start();
return dl;