Can Rust interface with Go libraries?

1

I just found a library that seems extremely useful and could save us a lot of work.. but it's written in Go. Can Rust interface with Go libraries? How would I go about doing that?

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2

C can interface with Go libraries, and hence Rust can too, via essentially the same process. I believe CGo will create a C header file, which can be converted into the appropriate Rust version via bindgen, or one can transliterate the Go signature to an appropriate Rust one manually. Something like:

//export GoFunction
func GoFunction(x int32) int64 { ... }

extern {
     fn GoFunction(x: i32) -> i64;
}

(There is non-trivial overhead with calling into Go from a different language: on my machine a call from C to Go took ~900 ns, but from C to C or Rust took ~2 ns. However, this isn't a reason not to do it, just something to keep in mind: there are many situations where the call overhead isn't a concern at all.)

Linking to the Go library is best performed by creating a dynamic library that exports the functionality you need, and then using a Cargo build script to point cargo to the library (the build script could even invoke go ... to build it).

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3

Cool. Does that catch panics on the boundary? Would be cool to measure the overhead of that too.

4

Go 1.5 can create libs that can be linked to a C program. This currently works for OSX and Linux, but not for Windows. Looks like this:

go build -buildmode=c-shared -o libhello.so hello.go.

So you have to search the Internet for Go and -buildmode=c-shared.

Good luck, Haddock

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