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// Copyright 2020-2021, The Tremor Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file is urely for testing w/ EQC
// #![cfg_attr(coverage, no_coverage)]
use crate::prelude::*;
use crate::{
errors::{Error, Result},
registry::{self, Registry},
script::{AggrType, Return, Script},
EventContext, Value,
};
use std::ffi::CStr;
use std::os::raw::c_char;
use std::ptr;
fn eval(src: &str) -> Result<String> {
let reg: Registry = registry::registry();
let script = Script::parse(src, ®)?;
let mut event = Value::object();
let mut meta = Value::object();
let mut state = Value::null();
let value = script.run(
&EventContext::new(0, None),
AggrType::Emit,
&mut event,
&mut state,
&mut meta,
)?;
Ok(match value {
Return::Drop => String::from(r#"{"drop": null}"#),
Return::Emit { value, .. } => format!(r#"{{"emit": {}}}"#, value.encode()),
Return::EmitEvent { .. } => format!(r#"{{"emit": {}}}"#, event.encode()),
})
}
#[no_mangle]
pub extern "C" fn tremor_script_c_eval(
script: *const c_char,
dst: *mut c_char,
len: usize,
) -> usize {
let cstr = unsafe { CStr::from_ptr(script) };
match cstr
.to_str()
.map_err(Error::from)
.and_then(|ref mut s| eval(s))
{
Ok(result) => {
if result.len() < len {
unsafe {
let src = result.as_ptr().cast::<c_char>();
ptr::copy_nonoverlapping(src, dst, result.len());
*dst.add(result.len()) = 0;
0
}
} else {
result.len()
}
}
Err(e) => {
eprintln!("ERROR: {}", e);
1
}
}
}