Print exception information in run_selenium.py.

tools/testing/run_selenium.py

 #!/usr/bin/python
 
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 """Script to actually open a browser and perform the test, and reports back with
 the result. It uses Selenium WebDriver when possible for running the tests. It
 uses Selenium RC for Safari.
@@ skipping 267 matching lines @@
 
   print '>>> BATCH START'
   browser = None
   current_browser_name = None
 
   # TODO(jmesserly): It'd be nice to shutdown gracefully in the event of a
   # SIGTERM. Unfortunately dart:io cannot send SIGTERM, see dartbug.com/1756.
   signal.signal(signal.SIGTERM, lambda number, frame: close_browser(browser))
 
   try:
-    while True:
-      line = sys.stdin.readline()
-      if line == '--terminate\n':
-        print("Terminating selenium driver")
-        break
+    try:
+      while True:
+        line = sys.stdin.readline()
+        if line == '--terminate\n':
+          print("Terminating selenium driver")
+          break
 
-      (html_out, browser_name, executable_path,
-       timeout, mode, refresh) = parse_args(line.split())
+        (html_out, browser_name, executable_path,
+         timeout, mode, refresh) = parse_args(line.split())
 
-      # Sanity checks that test.dart is passing flags we can handle.
-      if mode != 'correctness':
-        print 'Batch test runner not compatible with perf testing'
-        return 1
-      if browser and current_browser_name != browser_name:
-        print('Batch test runner got multiple browsers: %s and %s'
-            % (current_browser_name, browser_name))
-        return 1
+        # Sanity checks that test.dart is passing flags we can handle.
+        if mode != 'correctness':
+          print 'Batch test runner not compatible with perf testing'
+          return 1
+        if browser and current_browser_name != browser_name:
+          print('Batch test runner got multiple browsers: %s and %s'
+              % (current_browser_name, browser_name))
+          return 1
 
-      # Start the browser on the first run
-      if browser is None:
-        current_browser_name = browser_name
-        browser = start_browser(browser_name, executable_path, html_out)
+        # Start the browser on the first run
+        if browser is None:
+          current_browser_name = browser_name
+          browser = start_browser(browser_name, executable_path, html_out)
 
-      source = run_test_in_browser(browser, html_out, timeout, mode, refresh)
+        source = run_test_in_browser(browser, html_out, timeout, mode, refresh)
 
-      # Test is done. Write end token to stderr and flush.
-      sys.stderr.write('>>> EOF STDERR\n')
-      sys.stderr.flush()
+        # Test is done. Write end token to stderr and flush.
+        sys.stderr.write('>>> EOF STDERR\n')
+        sys.stderr.flush()
 
-      # print one of:
-      # >>> TEST {PASS, FAIL, OK, CRASH, FAIL, TIMEOUT}
-      status = report_results(mode, source, browser)
-      if status == 0:
-        print '>>> TEST PASS'
-      elif source == TIMEOUT_ERROR_MSG:
-        print '>>> TEST TIMEOUT'
-      else:
-        print '>>> TEST FAIL'
-      sys.stdout.flush()
+        # print one of:
+        # >>> TEST {PASS, FAIL, OK, CRASH, FAIL, TIMEOUT}
+        status = report_results(mode, source, browser)
+        if status == 0:
+          print '>>> TEST PASS'
+        elif source == TIMEOUT_ERROR_MSG:
+          print '>>> TEST TIMEOUT'
+        else:
+          print '>>> TEST FAIL'
+        sys.stdout.flush()
+    except:
+      type, value, traceback = sys.exc_info()
+      print "run_selenium.py: Unexpected exception occured: "
+      print "    type: ", type
+      print "    value: ", value
+      print "    traceback: ", traceback
+      raise
   finally:
     sys.stdin.close()
     print("Closing browser");
 
     def close_output_streams():
       sys.stdout.flush()
       sys.stdout.close()
       sys.stderr.flush()
       sys.stderr.close()
 
@@ skipping 21 matching lines @@
   browser = start_browser(browser_name, executable_path, html_out)
 
   try:
     output = run_test_in_browser(browser, html_out, timeout, mode, refresh)
     return report_results(mode, output, browser)
   finally:
     close_browser(browser)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))