def simulate_cib_xml(runner, cib_xml):
"""
Run crm_simulate to get effects the cib would have on the live cluster
CommandRunner runner -- runner
string cib_xml -- CIB XML to simulate
"""
try:
new_cib_file = write_tmpfile(None)
transitions_file = write_tmpfile(None)
except OSError as e:
raise LibraryError(
reports.cib_simulate_error(format_os_error(e))
)
cmd = [
__exec("crm_simulate"),
"--simulate",
"--save-output", new_cib_file.name,
"--save-graph", transitions_file.name,
"--xml-pipe",
]
stdout, stderr, retval = runner.run(cmd, stdin_string=cib_xml)
if retval != 0:
raise LibraryError(
reports.cib_simulate_error(stderr.strip())
)
try:
new_cib_file.seek(0)
transitions_file.seek(0)
new_cib_xml = new_cib_file.read()
transitions_xml = transitions_file.read()
new_cib_file.close()
transitions_file.close()
return stdout, transitions_xml, new_cib_xml
except OSError as e:
raise LibraryError(
reports.cib_simulate_error(format_os_error(e))
)
def simulate_cib(runner, cib):
"""
Run crm_simulate to get effects the cib would have on the live cluster
CommandRunner runner -- runner
etree cib -- cib tree to simulate
"""
cib_xml = etree_to_str(cib)
try:
plaintext_result, transitions_xml, new_cib_xml = simulate_cib_xml(
runner, cib_xml)
return (plaintext_result.strip(), xml_fromstring(transitions_xml),
xml_fromstring(new_cib_xml))
except (etree.XMLSyntaxError, etree.DocumentInvalid) as e:
raise LibraryError(reports.cib_simulate_error(str(e)))