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Cap'n Proto provides a schema loader, which can be used to dynamically load schemas during runtime. To port this functionality to pycapnp, a new class is provided `C_SchemaLoader`, which exposes the Cap'n Proto C++ interface, and `SchemaLoader`, which is part of the pycapnp library. The specific use case for this is when a capnp message contains a Node.Reader: The schema for a yet unseen message can be loaded dynamically, allowing the future message to be properly processed. If the message is a struct containing other structs, all the schemas for every struct must be loaded to correctly parse the message. See https://github.com/DaneSlattery/capnp_generic_poc for a proof-of-concept. Add docs and cleanup Add more docs Reduce changes Fix flake8 formatting Fix get datatype
12 lines
458 B
C
12 lines
458 B
C
#pragma once
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#include "capnp/dynamic.h"
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#include "capnp/schema.capnp.h"
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/// @brief Convert the dynamic struct to a Node::Reader
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::capnp::schema::Node::Reader toReader(capnp::DynamicStruct::Reader reader)
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{
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// requires an intermediate step to AnyStruct before going directly to Node::Reader,
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// since there exists no direct conversion from DynamicStruct::Reader to Node::Reader.
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return reader.as<capnp::AnyStruct>().as<capnp::schema::Node>();
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}
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