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use crossbeam_channel::{unbounded, Receiver, Sender};
use serde_json::Value;
use std::sync::Arc;
use std::thread::{self, JoinHandle};
use crate::error::FilterError;
use crate::filter;
pub struct EvalRequest {
pub id: u64,
pub filter_text: String,
pub inputs: Arc<Vec<Value>>,
pub slurp_mode: bool,
}
pub struct EvalResult {
pub id: u64,
pub result: Result<Vec<Value>, FilterError>,
}
/// Cache for intermediate pipe results
struct PipeCache {
filter_text: String,
values: Arc<Vec<Value>>,
slurp_mode: bool,
}
impl PipeCache {
/// Check if new_filter extends cached filter at a pipe boundary.
/// Returns the suffix to evaluate if cache can be used, None otherwise.
fn get_suffix<'a>(&self, new_filter: &'a str, new_slurp: bool) -> Option<&'a str> {
// Input semantics changed - can't use cache
if new_slurp != self.slurp_mode {
return None;
}
// Normalize whitespace for comparison
let cached_trimmed = self.filter_text.trim();
let new_trimmed = new_filter.trim();
// Not a prefix match
if !new_trimmed.starts_with(cached_trimmed) {
return None;
}
let remainder = &new_trimmed[cached_trimmed.len()..];
let trimmed = remainder.trim_start();
if trimmed.is_empty() {
// Exact match - use cache as-is
return Some("");
}
if trimmed.starts_with('|') {
// Valid pipe extension - return the part after the pipe
return Some(trimmed.strip_prefix('|').unwrap().trim_start());
}
// Not at pipe boundary (e.g., ".foo" -> ".foobar")
None
}
}
pub struct Worker {
request_tx: Sender<EvalRequest>,
result_rx: Receiver<EvalResult>,
_handle: JoinHandle<()>,
}
impl Worker {
pub fn spawn() -> Self {
let (request_tx, request_rx) = unbounded::<EvalRequest>();
let (result_tx, result_rx) = unbounded::<EvalResult>();
let handle = thread::spawn(move || {
let mut cache: Option<PipeCache> = None;
while let Ok(req) = request_rx.recv() {
// Skip if newer request waiting (implicit cancellation)
if !request_rx.is_empty() {
continue;
}
// Check for cache hit
let (base_values, filter_to_eval) = match &cache {
Some(c) => match c.get_suffix(&req.filter_text, req.slurp_mode) {
Some("") => {
// Exact match - return cached values directly
let _ = result_tx.send(EvalResult {
id: req.id,
result: Ok((*c.values).clone()),
});
continue;
}
Some(suffix) => {
// Pipe extension - evaluate only the suffix on cached values
(Arc::clone(&c.values), suffix.to_string())
}
None => {
// No cache hit - evaluate full filter
(prepare_inputs(&req), req.filter_text.clone())
}
},
None => {
// No cache - evaluate full filter
(prepare_inputs(&req), req.filter_text.clone())
}
};
// Evaluate the filter (either full or just the suffix)
let result = filter::evaluate_all(&filter_to_eval, &base_values);
// Update cache on success
if let Ok(ref values) = result {
cache = Some(PipeCache {
filter_text: req.filter_text.clone(),
values: Arc::new(values.clone()),
slurp_mode: req.slurp_mode,
});
}
let _ = result_tx.send(EvalResult { id: req.id, result });
}
});
Worker {
request_tx,
result_rx,
_handle: handle,
}
}
pub fn send(&self, req: EvalRequest) {
let _ = self.request_tx.send(req);
}
pub fn try_recv(&self) -> Option<EvalResult> {
self.result_rx.try_recv().ok()
}
}
fn prepare_inputs(req: &EvalRequest) -> Arc<Vec<Value>> {
if req.slurp_mode {
Arc::new(vec![Value::Array((*req.inputs).clone())])
} else {
Arc::clone(&req.inputs)
}
}