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"""Examples using create_subprocess_exec() and create_subprocess_shell()."""
import trollius as asyncio
from trollius import From
import signal
from trollius.subprocess import PIPE
from trollius.py33_exceptions import ProcessLookupError
@asyncio.coroutine
def cat(loop):
proc = yield From(asyncio.create_subprocess_shell("cat",
stdin=PIPE,
stdout=PIPE))
print("pid: %s" % proc.pid)
message = "Hello World!"
print("cat write: %r" % message)
stdout, stderr = yield From(proc.communicate(message.encode('ascii')))
print("cat read: %r" % stdout.decode('ascii'))
exitcode = yield From(proc.wait())
print("(exit code %s)" % exitcode)
@asyncio.coroutine
def ls(loop):
proc = yield From(asyncio.create_subprocess_exec("ls",
stdout=PIPE))
while True:
line = yield From(proc.stdout.readline())
if not line:
break
print("ls>>", line.decode('ascii').rstrip())
try:
proc.send_signal(signal.SIGINT)
except ProcessLookupError:
pass
@asyncio.coroutine
def test_call(*args, **kw):
timeout = kw.pop('timeout', None)
try:
proc = yield From(asyncio.create_subprocess_exec(*args))
exitcode = yield From(asyncio.wait_for(proc.wait(), timeout))
print("%s: exit code %s" % (' '.join(args), exitcode))
except asyncio.TimeoutError:
print("timeout! (%.1f sec)" % timeout)
proc.kill()
yield from proc.wait()
loop = asyncio.get_event_loop()
loop.run_until_complete(cat(loop))
loop.run_until_complete(ls(loop))
loop.run_until_complete(test_call("bash", "-c", "sleep 3", timeout=1.0))
loop.close()
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