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#pragma once
///@file
#include "notifying-counter.hh"
#include "store-api.hh"
#include "goal.hh"
#include "realisation.hh"
#include <future>
namespace nix {
class Worker;
/**
* Substitution of a derivation output.
* This is done in three steps:
* 1. Fetch the output info from a substituter
* 2. Substitute the corresponding output path
* 3. Register the output info
*/
class DrvOutputSubstitutionGoal : public Goal {
/**
* The drv output we're trying to substitute
*/
DrvOutput id;
/**
* The realisation corresponding to the given output id.
* Will be filled once we can get it.
*/
std::shared_ptr<const Realisation> outputInfo;
/**
* The remaining substituters.
*/
std::list<ref<Store>> subs;
/**
* The current substituter.
*/
std::shared_ptr<Store> sub;
NotifyingCounter<uint64_t>::Bump maintainRunningSubstitutions;
struct DownloadState
{
kj::Own<kj::CrossThreadPromiseFulfiller<void>> outPipe;
std::future<std::shared_ptr<const Realisation>> result;
};
std::shared_ptr<DownloadState> downloadState;
/**
* Whether a substituter failed.
*/
bool substituterFailed = false;
public:
DrvOutputSubstitutionGoal(
const DrvOutput & id,
Worker & worker,
bool isDependency,
RepairFlag repair = NoRepair,
std::optional<ContentAddress> ca = std::nullopt
);
kj::Promise<Result<WorkResult>> tryNext() noexcept;
kj::Promise<Result<WorkResult>> realisationFetched() noexcept;
kj::Promise<Result<WorkResult>> outPathValid() noexcept;
kj::Promise<Result<WorkResult>> finished() noexcept;
kj::Promise<Result<WorkResult>> work() noexcept override;
JobCategory jobCategory() const override {
return JobCategory::Substitution;
};
};
}
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