Recording gRPC

err := m.StartRecording(mockgrpc.RecordTarget("localhost:50051"), mockgrpc.RecordDir("testdata/grpc_recorded"))
// ... calls to m reach the target, and are recorded ...
res, err := m.StopRecording(ctx) // writes the mock files, then serves them

A gRPC server records as an HTTP one does. With RecordTarget, the calls the recording takes go to the target before any mock; without one, it takes the answers of From mocks, and of every mock with RecordIncludeMocked(true). RecordMethods names the methods it takes, as Method does, and RecordRequestHeaders the metadata its mocks match. A recording matches a call by its method, its messages and that metadata, and answers with the header, messages, trailer and status of the calls of that request in turn, as a response_sequence, then the last one again; RecordRepeats(vlatte.RecordFirst) keeps the first only. A bidi call matches by its method and metadata only, as bidi mocks do, and plays its messages back at once. Setup().Record(...), the grpc.record section of the settings and the admin API's /recording routes record too, and a server serves the recordings of its grpc.record.dir, _mocks_recorded under its root directory by default.