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Systematize the worker protocol derived path serialiser

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It was some ad-hoc functions to account for versions, while the already
factored-out serializer just supported the latest version.

Now, we can fold that version-specific logic into the factored out one,
and so we do.
This commit is contained in:
John Ericson 2023-05-26 14:48:11 -04:00
parent 96c58550b8
commit 4372738efe
6 changed files with 56 additions and 50 deletions
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26
src/libstore/worker-protocol.cc
View file

@ -51,12 +51,34 @@ void WorkerProto::Serialise<std::optional<TrustedFlag>>::write(const Store & sto
DerivedPath WorkerProto::Serialise<DerivedPath>::read(const Store & store, WorkerProto::ReadConn conn)
{
auto s = readString(conn.from);
return DerivedPath::parseLegacy(store, s);
if (GET_PROTOCOL_MINOR(conn.version) >= 30) {
return DerivedPath::parseLegacy(store, s);
} else {
return parsePathWithOutputs(store, s).toDerivedPath();
}
}
void WorkerProto::Serialise<DerivedPath>::write(const Store & store, WorkerProto::WriteConn conn, const DerivedPath & req)
{
conn.to << req.to_string_legacy(store);
if (GET_PROTOCOL_MINOR(conn.version) >= 30) {
conn.to << req.to_string_legacy(store);
} else {
auto sOrDrvPath = StorePathWithOutputs::tryFromDerivedPath(req);
std::visit(overloaded {
[&](const StorePathWithOutputs & s) {
conn.to << s.to_string(store);
},
[&](const StorePath & drvPath) {
throw Error("trying to request '%s', but daemon protocol %d.%d is too old (< 1.29) to request a derivation file",
store.printStorePath(drvPath),
GET_PROTOCOL_MAJOR(conn.version),
GET_PROTOCOL_MINOR(conn.version));
},
[&](std::monostate) {
throw Error("wanted to build a derivation that is itself a build product, but protocols do not support that. Try upgrading the Nix on the other end of this connection");
},
}, sOrDrvPath);
}
}