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Factor out commonality between WorkerProto::Basic{Client,Server}Connection

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This also renames clientVersion and daemonVersion to the more correct
protoVersion (since it's the version agreed to by both sides).
This commit is contained in:
Eelco Dolstra 2024-07-17 15:27:15 +02:00
parent 8ce4287409
commit c1d5cf6f34
8 changed files with 100 additions and 130 deletions
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114
src/libstore/worker-protocol-connection.hh
View file

@ -6,7 +6,7 @@
namespace nix {
struct WorkerProto::BasicClientConnection
struct WorkerProto::BasicConnection
{
/**
* Send with this.
@ -19,14 +19,45 @@ struct WorkerProto::BasicClientConnection
FdSource from;
/**
* Worker protocol version used for the connection.
*
* Despite its name, it is actually the maximum version both
* sides support. (If the maximum doesn't exist, we would fail to
* establish a connection and produce a value of this type.)
* The protocol version agreed by both sides.
*/
WorkerProto::Version daemonVersion;
WorkerProto::Version protoVersion;
/**
* Coercion to `WorkerProto::ReadConn`. This makes it easy to use the
* factored out serve protocol serializers with a
* `LegacySSHStore::Connection`.
*
* The serve protocol connection types are unidirectional, unlike
* this type.
*/
operator WorkerProto::ReadConn()
{
return WorkerProto::ReadConn{
.from = from,
.version = protoVersion,
};
}
/**
* Coercion to `WorkerProto::WriteConn`. This makes it easy to use the
* factored out serve protocol serializers with a
* `LegacySSHStore::Connection`.
*
* The serve protocol connection types are unidirectional, unlike
* this type.
*/
operator WorkerProto::WriteConn()
{
return WorkerProto::WriteConn{
.to = to,
.version = protoVersion,
};
}
};
struct WorkerProto::BasicClientConnection : WorkerProto::BasicConnection
{
/**
* Flush to direction
*/
@ -60,38 +91,6 @@ struct WorkerProto::BasicClientConnection
*/
ClientHandshakeInfo postHandshake(const StoreDirConfig & store);
/**
* Coercion to `WorkerProto::ReadConn`. This makes it easy to use the
* factored out serve protocol serializers with a
* `LegacySSHStore::Connection`.
*
* The serve protocol connection types are unidirectional, unlike
* this type.
*/
operator WorkerProto::ReadConn()
{
return WorkerProto::ReadConn{
.from = from,
.version = daemonVersion,
};
}
/**
* Coercion to `WorkerProto::WriteConn`. This makes it easy to use the
* factored out serve protocol serializers with a
* `LegacySSHStore::Connection`.
*
* The serve protocol connection types are unidirectional, unlike
* this type.
*/
operator WorkerProto::WriteConn()
{
return WorkerProto::WriteConn{
.to = to,
.version = daemonVersion,
};
}
void addTempRoot(const StoreDirConfig & remoteStore, bool * daemonException, const StorePath & path);
StorePathSet queryValidPaths(
@ -124,43 +123,8 @@ struct WorkerProto::BasicClientConnection
void importPaths(const StoreDirConfig & store, bool * daemonException, Source & source);
};
struct WorkerProto::BasicServerConnection
struct WorkerProto::BasicServerConnection : WorkerProto::BasicConnection
{
/**
* Send with this.
*/
FdSink & to;
/**
* Receive with this.
*/
FdSource & from;
/**
* Worker protocol version used for the connection.
*
* Despite its name, it is actually the maximum version both
* sides support. (If the maximum doesn't exist, we would fail to
* establish a connection and produce a value of this type.)
*/
WorkerProto::Version clientVersion;
operator WorkerProto::ReadConn()
{
return WorkerProto::ReadConn{
.from = from,
.version = clientVersion,
};
}
operator WorkerProto::WriteConn()
{
return WorkerProto::WriteConn{
.to = to,
.version = clientVersion,
};
}
/**
* Establishes connection, negotiating version.
*