Copy {uds-,}remote-store.{cc,hh}

This prepares for the splitting that happens in the next commit.

src/libstore/uds-remote-store.hh

@@ -0,0 +1,204 @@
+#pragma once
+
+#include <limits>
+#include <string>
+
+#include "store-api.hh"
+#include "local-fs-store.hh"
+
+
+namespace nix {
+
+
+class Pipe;
+class Pid;
+struct FdSink;
+struct FdSource;
+template<typename T> class Pool;
+struct ConnectionHandle;
+
+struct RemoteStoreConfig : virtual StoreConfig
+{
+    using StoreConfig::StoreConfig;
+
+    const Setting<int> maxConnections{(StoreConfig*) this, 1,
+            "max-connections", "maximum number of concurrent connections to the Nix daemon"};
+
+    const Setting<unsigned int> maxConnectionAge{(StoreConfig*) this, std::numeric_limits<unsigned int>::max(),
+            "max-connection-age", "number of seconds to reuse a connection"};
+};
+
+/* FIXME: RemoteStore is a misnomer - should be something like
+   DaemonStore. */
+class RemoteStore : public virtual Store, public virtual RemoteStoreConfig
+{
+public:
+
+    virtual bool sameMachine() = 0;
+
+    RemoteStore(const Params & params);
+
+    /* Implementations of abstract store API methods. */
+
+    bool isValidPathUncached(const StorePath & path) override;
+
+    StorePathSet queryValidPaths(const StorePathSet & paths,
+        SubstituteFlag maybeSubstitute = NoSubstitute) override;
+
+    StorePathSet queryAllValidPaths() override;
+
+    void queryPathInfoUncached(const StorePath & path,
+        Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept override;
+
+    void queryReferrers(const StorePath & path, StorePathSet & referrers) override;
+
+    StorePathSet queryValidDerivers(const StorePath & path) override;
+
+    StorePathSet queryDerivationOutputs(const StorePath & path) override;
+
+    std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path) override;
+    std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override;
+
+    StorePathSet querySubstitutablePaths(const StorePathSet & paths) override;
+
+    void querySubstitutablePathInfos(const StorePathCAMap & paths,
+        SubstitutablePathInfos & infos) override;
+
+    /* Add a content-addressable store path. `dump` will be drained. */
+    ref<const ValidPathInfo> addCAToStore(
+        Source & dump,
+        const string & name,
+        ContentAddressMethod caMethod,
+        const StorePathSet & references,
+        RepairFlag repair);
+
+    /* Add a content-addressable store path. Does not support references. `dump` will be drained. */
+    StorePath addToStoreFromDump(Source & dump, const string & name,
+        FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256, RepairFlag repair = NoRepair) override;
+
+    void addToStore(const ValidPathInfo & info, Source & nar,
+        RepairFlag repair, CheckSigsFlag checkSigs) override;
+
+    StorePath addTextToStore(const string & name, const string & s,
+        const StorePathSet & references, RepairFlag repair) override;
+
+    void buildPaths(const std::vector<StorePathWithOutputs> & paths, BuildMode buildMode) override;
+
+    BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
+        BuildMode buildMode) override;
+
+    void ensurePath(const StorePath & path) override;
+
+    void addTempRoot(const StorePath & path) override;
+
+    void addIndirectRoot(const Path & path) override;
+
+    void syncWithGC() override;
+
+    Roots findRoots(bool censor) override;
+
+    void collectGarbage(const GCOptions & options, GCResults & results) override;
+
+    void optimiseStore() override;
+
+    bool verifyStore(bool checkContents, RepairFlag repair) override;
+
+    void addSignatures(const StorePath & storePath, const StringSet & sigs) override;
+
+    void queryMissing(const std::vector<StorePathWithOutputs> & targets,
+        StorePathSet & willBuild, StorePathSet & willSubstitute, StorePathSet & unknown,
+        uint64_t & downloadSize, uint64_t & narSize) override;
+
+    void connect() override;
+
+    unsigned int getProtocol() override;
+
+    void flushBadConnections();
+
+    struct Connection
+    {
+        AutoCloseFD fd;
+        FdSink to;
+        FdSource from;
+        unsigned int daemonVersion;
+        std::chrono::time_point<std::chrono::steady_clock> startTime;
+
+        virtual ~Connection();
+
+        std::exception_ptr processStderr(Sink * sink = 0, Source * source = 0, bool flush = true);
+    };
+
+    ref<Connection> openConnectionWrapper();
+
+protected:
+
+    virtual ref<Connection> openConnection() = 0;
+
+    void initConnection(Connection & conn);
+
+    ref<Pool<Connection>> connections;
+
+    virtual void setOptions(Connection & conn);
+
+    ConnectionHandle getConnection();
+
+    friend struct ConnectionHandle;
+
+    virtual ref<FSAccessor> getFSAccessor() override;
+
+    virtual void narFromPath(const StorePath & path, Sink & sink) override;
+
+    ref<const ValidPathInfo> readValidPathInfo(ConnectionHandle & conn, const StorePath & path);
+
+private:
+
+    std::atomic_bool failed{false};
+
+};
+
+struct UDSRemoteStoreConfig : virtual LocalFSStoreConfig, virtual RemoteStoreConfig
+{
+    UDSRemoteStoreConfig(const Store::Params & params)
+        : StoreConfig(params)
+        , LocalFSStoreConfig(params)
+        , RemoteStoreConfig(params)
+    {
+    }
+
+    UDSRemoteStoreConfig()
+        : UDSRemoteStoreConfig(Store::Params({}))
+    {
+    }
+
+    const std::string name() override { return "Local Daemon Store"; }
+};
+
+class UDSRemoteStore : public LocalFSStore, public RemoteStore, public virtual UDSRemoteStoreConfig
+{
+public:
+
+    UDSRemoteStore(const Params & params);
+    UDSRemoteStore(const std::string scheme, std::string path, const Params & params);
+
+    std::string getUri() override;
+
+    static std::set<std::string> uriSchemes()
+    { return {"unix"}; }
+
+    bool sameMachine() override
+    { return true; }
+
+    ref<FSAccessor> getFSAccessor() override
+    { return LocalFSStore::getFSAccessor(); }
+
+    void narFromPath(const StorePath & path, Sink & sink) override
+    { LocalFSStore::narFromPath(path, sink); }
+
+private:
+
+    ref<RemoteStore::Connection> openConnection() override;
+    std::optional<std::string> path;
+};
+
+
+}