This crate provides rust bindings for the C API of the go-jsonnet library.
You will need to have go 1.12+ installed in order to build go-jsonnet. This can be gotten via either,
- your package manager (e.g. apt install golang-go), or,
- the official golang.org install page: https://go.dev/doc/install.
use std::ffi::CStr;
use jsonnet_go_sys::*;
#[derive(Debug, serde::Deserialize)]
struct Basic {
field: String,
}
let filename = c"basic.jsonnet";
let jsonnet = c"{ field: std.base64('abcd') }";
let vm = unsafe { jsonnet_make() };
let mut error = 0;
let messageptr = unsafe {
jsonnet_evaluate_snippet(
vm,
filename.as_ptr() as _,
jsonnet.as_ptr() as _,
&mut error
)
};
let message = unsafe { CStr::from_ptr(messageptr) };
let message = message.to_str().unwrap();
if error != 0 {
panic!("jsonnet evaluation returned an error: {message}");
}
let json: Basic = serde_json::from_str(message).unwrap();
assert_eq!(json.field, "YWJjZA==");
unsafe { jsonnet_realloc(vm, messageptr, 0) };
unsafe { jsonnet_destroy(vm) };