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#pragma once
///@file
#include "store-api.hh"
#include "goal.hh"
#include "realisation.hh"
#include <thread>
#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;
/**
* The substituter thread.
*/
std::thread thr;
std::unique_ptr<MaintainCount<uint64_t>> maintainRunningSubstitutions;
struct DownloadState
{
Pipe 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, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
typedef void (DrvOutputSubstitutionGoal::*GoalState)();
GoalState state;
void init();
void tryNext();
void realisationFetched();
void outPathValid();
void finished();
void timedOut(Error && ex) override { abort(); };
std::string key() override;
void work() override;
void handleEOF(int fd) override;
JobCategory jobCategory() const override {
return JobCategory::Substitution;
};
};
}
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