2040240e23
The typical use is to inherit Config and add Setting<T> members:
class MyClass : private Config
{
Setting<int> foo{this, 123, "foo", "the number of foos to use"};
Setting<std::string> bar{this, "blabla", "bar", "the name of the bar"};
MyClass() : Config(readConfigFile("/etc/my-app.conf"))
{
std::cout << foo << "\n"; // will print 123 unless overriden
}
};
Currently, this is used by Store and its subclasses for store
parameters. You now get a warning if you specify a non-existant store
parameter in a store URI.
104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
#include "store-api.hh"
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#include "remote-store.hh"
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#include "remote-fs-accessor.hh"
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#include "archive.hh"
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#include "worker-protocol.hh"
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#include "pool.hh"
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#include "ssh.hh"
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namespace nix {
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static std::string uriScheme = "ssh-ng://";
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class SSHStore : public RemoteStore
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{
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public:
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const Setting<Path> sshKey{(Store*) this, "", "ssh-key", "path to an SSH private key"};
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const Setting<bool> compress{(Store*) this, false, "compress", "whether to compress the connection"};
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SSHStore(const std::string & host, const Params & params)
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: Store(params)
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, RemoteStore(params)
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, host(host)
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, master(
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host,
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sshKey,
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// Use SSH master only if using more than 1 connection.
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connections->capacity() > 1,
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compress)
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{
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}
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std::string getUri() override
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{
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return uriScheme + host;
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}
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void narFromPath(const Path & path, Sink & sink) override;
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ref<FSAccessor> getFSAccessor() override;
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private:
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struct Connection : RemoteStore::Connection
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{
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std::unique_ptr<SSHMaster::Connection> sshConn;
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};
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ref<RemoteStore::Connection> openConnection() override;
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std::string host;
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SSHMaster master;
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};
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class ForwardSource : public Source
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{
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Source & readSource;
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Sink & writeSink;
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public:
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ForwardSource(Source & readSource, Sink & writeSink) : readSource(readSource), writeSink(writeSink) {}
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size_t read(unsigned char * data, size_t len) override
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{
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auto res = readSource.read(data, len);
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writeSink(data, len);
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return res;
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}
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};
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void SSHStore::narFromPath(const Path & path, Sink & sink)
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{
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auto conn(connections->get());
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conn->to << wopNarFromPath << path;
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conn->processStderr();
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ParseSink ps;
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auto fwd = ForwardSource(conn->from, sink);
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parseDump(ps, fwd);
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}
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ref<FSAccessor> SSHStore::getFSAccessor()
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{
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return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()));
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}
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ref<RemoteStore::Connection> SSHStore::openConnection()
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{
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auto conn = make_ref<Connection>();
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conn->sshConn = master.startCommand("nix-daemon --stdio");
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conn->to = FdSink(conn->sshConn->in.get());
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conn->from = FdSource(conn->sshConn->out.get());
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initConnection(*conn);
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return conn;
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}
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static RegisterStoreImplementation regStore([](
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const std::string & uri, const Store::Params & params)
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-> std::shared_ptr<Store>
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{
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if (std::string(uri, 0, uriScheme.size()) != uriScheme) return 0;
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return std::make_shared<SSHStore>(std::string(uri, uriScheme.size()), params);
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});
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}
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