Fix: Wrap callback call in try/catch and rethrow async (fixes #45) (#46)

index.js

@@ -11,6 +11,22 @@ var eosConfig = {
   error: false,
 };
 
+function rethrowAsync(err) {
+  process.nextTick(rethrow);
+
+  function rethrow() {
+    throw err;
+  }
+}
+
+function tryCatch(fn, args) {
+  try {
+    return fn.apply(null, args);
+  } catch (err) {
+    rethrowAsync(err);
+  }
+}
+
 function asyncDone(fn, cb) {
   cb = once(cb);
 
@@ -21,18 +37,18 @@ function asyncDone(fn, cb) {
   function done() {
     d.removeListener('error', onError);
     d.exit();
-    return cb.apply(null, arguments);
+    return tryCatch(cb, arguments);
   }
 
   function onSuccess(result) {
-    tick(done, null, result);
+    done(null, result);
   }
 
   function onError(error) {
     if (!error) {
       error = new Error('Promise rejected without Error');
     }
-    tick(done, error);
+    done(error);
   }
 
   function asyncRunner() {

package.json

@@ -40,6 +40,7 @@
     "jscs": "^2.3.5",
     "jscs-preset-gulp": "^1.0.0",
     "mocha": "^2.4.5",
+    "pumpify": "^1.3.6",
     "rx": "^4.0.6",
     "through2": "^2.0.0",
     "when": "^3.7.3"

test/promises.js

@@ -48,6 +48,7 @@ describe('promises', function() {
     var d = domain.create();
     d.once('error', function(err) {
       expect(err).toExist();
+      expect(err.message).toContain('Boom');
       done();
     });
     d.run(function() {

test/streams.js

@@ -5,6 +5,7 @@ var expect = require('expect');
 var fs = require('fs');
 var path = require('path');
 var through = require('through2');
+var pumpify = require('pumpify');
 
 var asyncDone = require('../');
 
@@ -29,6 +30,21 @@ function failure() {
   return read.pipe(new EndStream());
 }
 
+function withErr(chunk, _, cb) {
+  cb(new Error('Fail'));
+}
+
+function pumpifyError() {
+  var read = fs.createReadStream(exists);
+  var pipeline = pumpify(
+    through(),
+    through(withErr),
+    through()
+  );
+
+  return read.pipe(pipeline);
+}
+
 function unpiped() {
   return fs.createReadStream(exists);
 }
@@ -48,6 +64,14 @@ describe('streams', function() {
     });
   });
 
+  it('should handle an errored pipeline', function(done) {
+    asyncDone(pumpifyError, function(err) {
+      expect(err).toBeAn(Error);
+      expect(err.message).toNotBe('premature close');
+      done();
+    });
+  });
+
   it('handle a returned stream and cb by only calling callback once', function(done) {
     asyncDone(function(cb) {
       return success().on('end', function() {