Move run_js into jsrun.py (work towards breaking emscripten.py's dependency on shared, which requires .emscripten at import time)

1 files changed, 27 insertions, 0 deletions

diff --git a/tools/jsrun.py b/tools/jsrun.py
new file mode 100644
index 00000000..27c55350
--- /dev/null
+++ b/tools/jsrun.py
@@ -0,0 +1,27 @@
+import time
+from subprocess import Popen, PIPE, STDOUT
+
+def timeout_run(proc, timeout, note='unnamed process', full_output=False):
+  start = time.time()
+  if timeout is not None:
+    while time.time() - start < timeout and proc.poll() is None:
+      time.sleep(0.1)
+    if proc.poll() is None:
+      proc.kill() # XXX bug: killing emscripten.py does not kill it's child process!
+      raise Exception("Timed out: " + note)
+  out = proc.communicate()
+  return '\n'.join(out) if full_output else out[0]
+
+def run_js(filename, engine=None, args=[], check_timeout=False, stdout=PIPE, stderr=None, cwd=None, full_output=False):
+  if type(engine) is not list:
+    engine = [engine]
+  command = engine + [filename] + (['--'] if 'd8' in engine[0] else []) + args
+  return timeout_run(
+    Popen(
+      command,
+      stdout=stdout,
+      stderr=stderr,
+      cwd=cwd),
+    15*60 if check_timeout else None,
+    'Execution',
+    full_output=full_output)