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libutil: Add RestartableSource

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This is necessary to make seeking work with libcurl.
This commit is contained in:
Sergei Zimmerman 2025-10-28 01:54:58 +03:00 • committed by John Ericson
parent e947c895ec
commit b8d7f551e4
2 changed files with 60 additions and 1 deletions
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37
src/libutil/serialise.cc
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@ -513,4 +513,41 @@ size_t ChainSource::read(char * data, size_t len)
}
}
std::unique_ptr<RestartableSource> restartableSourceFromFactory(std::function<std::unique_ptr<Source>()> factory)
{
struct RestartableSourceImpl : RestartableSource
{
RestartableSourceImpl(decltype(factory) factory_)
: factory_(std::move(factory_))
, impl(this->factory_())
{
}
decltype(factory) factory_;
std::unique_ptr<Source> impl = factory_();
size_t read(char * data, size_t len) override
{
return impl->read(data, len);
}
bool good() override
{
return impl->good();
}
void skip(size_t len) override
{
return impl->skip(len);
}
void restart() override
{
impl = factory_();
}
};
return std::make_unique<RestartableSourceImpl>(std::move(factory));
}
} // namespace nix