I'm trying to use capnp to connect an Ocaml process to a Python process. I have succes

Error: This vat only supports a bootstrap interface, not the old Cap'n-Proto-0.4-style named exports about capnp-rpc HOT 4 CLOSED

mirage commented on June 7, 2024

Error: This vat only supports a bootstrap interface, not the old Cap'n-Proto-0.4-style named exports

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talex5 commented on June 7, 2024

Yes, it uses the original (simpler) bootstrapping scheme. I didn't know anyone was using the newer one (I thought it might have been abandoned).

I think you probably just need to use restorer instead of bootstrap in the Python server.

Possibly the OCaml code should skip setting the ID if it's the empty string so it can support either scheme.

Line 73 in 8365bca

    
           Schema.BuilderOps.write_string (Bootstrap.deprecated_object_id_get boot) object_id;

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LasseBlaauwbroek commented on June 7, 2024

Thanks for the quick reply. Unfortunately, it looks like the workaround you suggested will not work, because the restorer named argument was removed from the python implementation in 2019 (even though the documentation still mentions it): capnproto/pycapnp@f6dd08d#diff-17d3a2bf99cbe0f9aeebce3362e3e7c5ce9a732f43c205cee6c00fee54a09790L2417

Do you have any ideas for other workarounds? Thanks.

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talex5 commented on June 7, 2024

Did the other change I suggested work? i.e. don't set the object_id if it's the empty string.

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LasseBlaauwbroek commented on June 7, 2024

Ah sorry, I thought that was more of a meta-comment, not something for me to try. I tried it now, and I can indeed confirm it works. See PR #224.

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