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https://github.com/logos-messaging/nim-ffi.git
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3240ac0080
5a: record {.ffiHost.} procs in a compile-time registry (FFIHostMeta /
ffiHostRegistry), populated by the macro, so generators can see host fns.
5b: the Go generator emits an idiomatic wrapper over the host C ABI:
- a single //export cgo trampoline backs every host fn; a cgo.Handle in
userData selects the Go closure;
- the closure runs on a fresh GOROUTINE so the FFI thread is never blocked
(the non-blocking contract), then answers via <lib>_host_complete by token;
- a per-host `Set<Name>(func(string) (string, error))` method registers it.
Validated end to end with `go run` (examples/host_demo): Go UseToken -> Nim
{.ffi.} handler -> await fetchToken {.ffiHost.} -> Go trampoline -> goroutine
runs the closure -> host_complete -> future resolves on the loop thread ->
"token[TOK-session]" back in Go. Timer's Go output is unchanged (no host fns);
its regenerated .h just gains the always-exported host ABI decls.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
36 lines
921 B
Makefile
36 lines
921 B
Makefile
# Build the Nim dylib next to the generated Go package and run the host-callback
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# example.
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#
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# make run # build libhost_demo + run the example
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# make clean
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#
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# The generated package's cgo directives use ${SRCDIR}, so the library only has
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# to sit in this directory (-L/-rpath point here). It is compiled from the repo
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# root so the vendored Nimble dependencies resolve.
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REPO_ROOT := $(abspath ../../..)
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NIM_SRC := $(REPO_ROOT)/examples/host_demo/host_demo.nim
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UNAME_S := $(shell uname -s)
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ifeq ($(UNAME_S),Darwin)
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LIBNAME := libhost_demo.dylib
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else
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LIBNAME := libhost_demo.so
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endif
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NIMFLAGS := --mm:orc -d:chronicles_log_level=WARN --app:lib --noMain \
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--nimMainPrefix:libhost_demo
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.PHONY: all run clean
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all: $(LIBNAME)
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$(LIBNAME):
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cd $(REPO_ROOT) && nim c $(NIMFLAGS) -o:$(CURDIR)/$(LIBNAME) $(NIM_SRC)
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run: $(LIBNAME)
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cd example && go run .
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clean:
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rm -f $(LIBNAME) example/example
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