fix(solc): make scoped reporter work in parallel (gakonst#1214)

* fix(solc): make scoped reporter work in parallel

* typo

ethers-solc/src/compile/project.rs

@@ -543,11 +543,20 @@ fn compile_parallel(
         }
     }
 
+    // need to get the currently installed reporter before installing the pool, otherwise each new
+    // thread in the pool will get initialized with the default value of the `thread_local!`'s
+    // localkey. This way we keep access to the reporter in the rayon pool
+    let scoped_report = report::get_default(|reporter| reporter.clone());
+
     // start a rayon threadpool that will execute all `Solc::compile()` processes
     let pool = rayon::ThreadPoolBuilder::new().num_threads(num_jobs).build().unwrap();
+
     let outputs = pool.install(move || {
         jobs.into_par_iter()
-            .map(|(solc, version, input, actually_dirty)| {
+            .map(move |(solc, version, input, actually_dirty)| {
+                // set the reporter on this thread
+                let _guard = report::set_scoped(&scoped_report);
+
                 tracing::trace!(
                     "calling solc `{}` {:?} with {} sources: {:?}",
                     version,

ethers-solc/src/report/mod.rs

@@ -93,7 +93,7 @@ where
 /// print custom messages to `stdout`.
 ///
 /// A `Reporter` is entirely passive and only listens to incoming "events".
-pub trait Reporter: 'static {
+pub trait Reporter: 'static + std::fmt::Debug {
     /// Callback invoked right before [`Solc::compile()`] is called
     ///
     /// This contains the [Solc] its [Version] the complete [CompilerInput] and all files that
@@ -453,6 +453,7 @@ mod tests {
 
     #[test]
     fn scoped_reporter_works() {
+        #[derive(Debug)]
         struct TestReporter;
         impl Reporter for TestReporter {}
 
@@ -468,6 +469,7 @@ mod tests {
         });
 
         set_global_reporter(Report::new(BasicStdoutReporter::default())).unwrap();
+        #[derive(Debug)]
         struct TestReporter;
         impl Reporter for TestReporter {}