feat: added salsa integration to plugin core

hipcheck/src/engine.rs

@@ -0,0 +1,89 @@
+#![allow(unused)]
+
+use crate::plugin::{ActivePlugin, HcPluginCore, PluginExecutor, PluginResponse, PluginWithConfig};
+use crate::{hc_error, Result};
+use serde_json::Value;
+use std::sync::{Arc, LazyLock};
+use tokio::runtime::Runtime;
+
+// Salsa doesn't natively support async functions, so our recursive `query()` function that
+// interacts with plugins (which use async) has to get a handle to the underlying runtime,
+// spawn and block on a task to query the plugin, then choose whether to recurse or return.
+
+static RUNTIME: LazyLock<Runtime> = LazyLock::new(|| Runtime::new().unwrap());
+
+#[salsa::query_group(HcEngineStorage)]
+pub trait HcEngine: salsa::Database {
+	#[salsa::input]
+	fn core(&self) -> Arc<HcPluginCore>;
+
+	fn query(&self, publisher: String, plugin: String, query: String, key: Value) -> Result<Value>;
+}
+
+fn query(
+	db: &dyn HcEngine,
+	publisher: String,
+	plugin: String,
+	query: String,
+	key: Value,
+) -> Result<Value> {
+	let runtime = RUNTIME.handle();
+	let core = db.core();
+	// Find the plugin
+	let Some(p_handle) = core.plugins.get(&plugin) else {
+		return Err(hc_error!("No such plugin {}::{}", publisher, plugin));
+	};
+	// Initiate the query. If remote closed or we got our response immediately,
+	// return
+	let mut ar = match runtime.block_on(p_handle.query(query, key))? {
+		PluginResponse::RemoteClosed => {
+			return Err(hc_error!("Plugin channel closed unexpected"));
+		}
+		PluginResponse::Completed(v) => return Ok(v),
+		PluginResponse::AwaitingResult(a) => a,
+	};
+	// Otherwise, the plugin needs more data to continue. Recursively query
+	// (with salsa memo-ization) to get the needed data, and resume our
+	// current query by providing the plugin the answer.
+	loop {
+		let answer = db.query(
+			ar.publisher.clone(),
+			ar.plugin.clone(),
+			ar.query.clone(),
+			ar.key.clone(),
+		)?;
+		ar = match runtime.block_on(p_handle.resume_query(ar, answer))? {
+			PluginResponse::RemoteClosed => {
+				return Err(hc_error!("Plugin channel closed unexpected"));
+			}
+			PluginResponse::Completed(v) => return Ok(v),
+			PluginResponse::AwaitingResult(a) => a,
+		};
+	}
+}
+
+#[salsa::database(HcEngineStorage)]
+pub struct HcEngineImpl {
+	// Query storage
+	storage: salsa::Storage<Self>,
+}
+
+impl salsa::Database for HcEngineImpl {}
+
+impl HcEngineImpl {
+	// Really HcEngineImpl and HcPluginCore do the same thing right now, except HcPluginCore
+	// has an async constructor. If we can manipulate salsa to accept async functions, we
+	// could consider merging the two structs. Although maybe its wise to keep HcPluginCore
+	// independent of Salsa.
+	pub fn new(executor: PluginExecutor, plugins: Vec<(PluginWithConfig)>) -> Result<Self> {
+		let runtime = RUNTIME.handle();
+		let core = runtime.block_on(HcPluginCore::new(executor, plugins))?;
+		let mut engine = HcEngineImpl {
+			storage: Default::default(),
+		};
+		engine.set_core(Arc::new(core));
+		Ok(engine)
+	}
+	// TODO - "run" function that takes analysis heirarchy and target, and queries each
+	// analysis plugin to kick off the execution
+}

hipcheck/src/main.rs

@@ -10,6 +10,7 @@ mod command_util;
 mod config;
 mod context;
 mod data;
+mod engine;
 mod error;
 mod git2_log_shim;
 mod git2_rustls_transport;
@@ -38,9 +39,10 @@ use crate::analysis::report_builder::Report;
 use crate::analysis::score::score_results;
 use crate::cache::HcCache;
 use crate::context::Context as _;
+use crate::engine::{HcEngine, HcEngineImpl};
 use crate::error::Error;
 use crate::error::Result;
-use crate::plugin::{HcPluginCore, Plugin, PluginExecutor, PluginWithConfig};
+use crate::plugin::{Plugin, PluginExecutor, PluginWithConfig};
 use crate::session::session::Session;
 use crate::setup::{resolve_and_transform_source, SourceType};
 use crate::shell::verbosity::Verbosity;
@@ -639,7 +641,6 @@ fn check_github_token() -> StdResult<(), EnvVarCheckError> {
 }
 
 fn cmd_plugin() {
-	use tokio::runtime::Runtime;
 	let tgt_dir = "./target/debug";
 	let entrypoint = pathbuf![tgt_dir, "dummy_rand_data"];
 	let plugin = Plugin {
@@ -654,30 +655,29 @@ fn cmd_plugin() {
 		/* jitter_percent */ 10,
 	)
 	.unwrap();
-	let rt = Runtime::new().unwrap();
-	rt.block_on(async move {
-		println!("Started executor");
-		let mut core = match HcPluginCore::new(
-			plugin_executor,
-			vec![PluginWithConfig(plugin, serde_json::json!(null))],
-		)
-		.await
-		{
-			Ok(c) => c,
-			Err(e) => {
-				println!("{e}");
-				return;
-			}
-		};
-		match core.run().await {
-			Ok(_) => {
-				println!("HcCore run completed");
-			}
-			Err(e) => {
-				println!("HcCore run failed with '{e}'");
-			}
-		};
-	});
+	let engine = match HcEngineImpl::new(
+		plugin_executor,
+		vec![PluginWithConfig(plugin, serde_json::json!(null))],
+	) {
+		Ok(e) => e,
+		Err(e) => {
+			println!("Failed to create engine: {e}");
+			return;
+		}
+	};
+	let res = match engine.query(
+		"MITRE".to_owned(),
+		"rand_data".to_owned(),
+		"rand_data".to_owned(),
+		serde_json::json!(7),
+	) {
+		Ok(r) => r,
+		Err(e) => {
+			println!("Query failed: {e}");
+			return;
+		}
+	};
+	println!("Result: {res}");
 }
 
 fn cmd_ready(config: &CliConfig) {
@@ -727,7 +727,6 @@ fn cmd_ready(config: &CliConfig) {
 		Err(e) => println!("{:<17} {}", "Policy Path:", e),
 	}
 
-
 	match &ready.github_token_check {
 		Ok(_) => println!("{:<17} Found!", "GitHub Token:"),
 		Err(e) => println!("{:<17} {}", "GitHub Token:", e),

hipcheck/src/plugin/mod.rs

@@ -41,7 +41,8 @@ pub async fn initialize_plugins(
 	Ok(out)
 }
 
-struct ActivePlugin {
+#[derive(Debug)]
+pub struct ActivePlugin {
 	next_id: Mutex<usize>,
 	channel: PluginTransport,
 }
@@ -91,9 +92,10 @@ impl ActivePlugin {
 	}
 }
 
+#[derive(Debug)]
 pub struct HcPluginCore {
 	executor: PluginExecutor,
-	plugins: HashMap<String, ActivePlugin>,
+	pub plugins: HashMap<String, ActivePlugin>,
 }
 impl HcPluginCore {
 	// When this object is returned, the plugins are all connected but the
@@ -128,13 +130,4 @@ impl HcPluginCore {
 		// Now we have a set of started and initialized plugins to interact with
 		Ok(HcPluginCore { executor, plugins })
 	}
-	// @Temporary
-	pub async fn run(&mut self) -> Result<()> {
-		let handle = self.plugins.get("rand_data").unwrap();
-		let resp = handle
-			.query("rand_data".to_owned(), serde_json::json!(7))
-			.await?;
-		println!("Plugin response: {resp:?}");
-		Ok(())
-	}
 }

hipcheck/src/plugin/types.rs

@@ -22,6 +22,7 @@ pub struct Plugin {
 }
 
 // Hipcheck-facing version of struct from crate::hipcheck
+#[derive(Clone, Debug)]
 pub struct Schema {
 	pub query_name: String,
 	pub key_schema: Value,
@@ -118,6 +119,7 @@ impl std::fmt::Display for ConfigError {
 }
 
 // State for managing an actively running plugin process
+#[derive(Debug)]
 pub struct PluginContext {
 	pub plugin: Plugin,
 	pub port: u16,
@@ -273,6 +275,7 @@ impl TryFrom<Query> for PluginQuery {
 	}
 }
 
+#[derive(Debug)]
 pub struct MultiplexedQueryReceiver {
 	rx: Streaming<PluginQuery>,
 	backlog: HashMap<i32, VecDeque<PluginQuery>>,
@@ -314,6 +317,7 @@ impl MultiplexedQueryReceiver {
 
 // Encapsulate an "initialized" state of a Plugin with interfaces that abstract
 // query chunking to produce whole messages for the Hipcheck engine
+#[derive(Debug)]
 pub struct PluginTransport {
 	pub schemas: HashMap<String, Schema>,
 	pub default_policy_expr: String, // TODO - update with policy_expr type