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96eeb6f4ff
This is good practice to avoid pessimisations. Left comments for the reasoning why ctors should be noexcept. There are some tricky cases where we intentionally want throwing move ctors/assignments. But those cases should really be reviewed, since some of those can be replaced with more idiomatic copy/move-and-swap.
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
#pragma once
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///@file
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#include "remote-store.hh"
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#include "worker-protocol.hh"
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#include "worker-protocol-connection.hh"
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#include "pool.hh"
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namespace nix {
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/**
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* Bidirectional connection (send and receive) used by the Remote Store
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* implementation.
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*
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* Contains `Source` and `Sink` for actual communication, along with
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* other information learned when negotiating the connection.
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*/
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struct RemoteStore::Connection : WorkerProto::BasicClientConnection,
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WorkerProto::ClientHandshakeInfo
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{
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/**
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* Time this connection was established.
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*/
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std::chrono::time_point<std::chrono::steady_clock> startTime;
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};
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/**
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* A wrapper around Pool<RemoteStore::Connection>::Handle that marks
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* the connection as bad (causing it to be closed) if a non-daemon
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* exception is thrown before the handle is closed. Such an exception
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* causes a deviation from the expected protocol and therefore a
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* desynchronization between the client and daemon.
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*/
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struct RemoteStore::ConnectionHandle
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{
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Pool<RemoteStore::Connection>::Handle handle;
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bool daemonException = false;
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ConnectionHandle(Pool<RemoteStore::Connection>::Handle && handle)
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: handle(std::move(handle))
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{ }
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ConnectionHandle(ConnectionHandle && h) noexcept
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: handle(std::move(h.handle))
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{ }
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~ConnectionHandle();
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RemoteStore::Connection & operator * () { return *handle; }
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RemoteStore::Connection * operator -> () { return &*handle; }
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void processStderr(Sink * sink = 0, Source * source = 0, bool flush = true, bool block = true);
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void withFramedSink(std::function<void(Sink & sink)> fun);
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};
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}
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