def serve_forever():
'''when new tasks show up in the database, pair them up with the next
available node for execution.
'''
signal.signal(signal.SIGINT, signal_handler)
log.write('dirt is running...')
nodes = settings.load_balancer(db)
tasks = db.get_tasks()
for id in tasks:
task_status = 'new'
while task_status == 'new' or task_status == 'retry':
node = nodes.next()
if dbi.check_requirements(db, id, node):
log.write('%s -> %s' % (id, node['fqdn']))
task_status = remote.remote_execute(db, node, id)
if task_status == 'abort':
log.write('Task %s aborted' % id)
else:
doc = db[id]
if 'nodes_tried' in doc:
doc['nodes_tried'].append(node['fqdn'])
else:
doc['nodes_tried'] = [node['fqdn']]
db.save(doc)
task_status = 'abort'
def node_recon(nodelist, interactive=True):
"""grab system information from a list of hosts and create or update
nodes' db entries.
"""
import execnet
from dirt.tasks import system_info
from dirt.core.db import db
nodes = db.get_nodes()
for node in nodelist:
log.write("Connecting to host %s" % node)
try:
gw = execnet.makegateway("ssh=%s" % node)
except execnet.HostNotFound:
log.write("Host not found: %s" % node)
continue
log.write("Connected to host %s" % node)
ch = gw.remote_exec(system_info)
sys_info = ch.receive()
# update the db
if sys_info["fqdn"] in nodes:
d = nodes[sys_info["fqdn"]]
d["sys_info"] = sys_info
d["enabled"] = True
else:
d = {"type": "node", "fqdn": sys_info["fqdn"], "sys_info": sys_info}
log.write("Adding new node %(fqdn)s to database" % d)
d["enabled"] = settings.node_enable_default
db.save(d)
def signal_handler(signal, frame):
'''handle SIGINTs gracefully, clearing running tasks from the db'''
log.write('Caught SIGINT (Ctrl-C), Exiting.')
# clear any currently-running tasks from db
log.write('Clearing running tasks from database')
nodes = db.get_nodes()
for node in nodes:
if 'alloc' in nodes[node]:
for i in range(len(nodes[node]['alloc'])):
# only clear tasks from this master
alloc = nodes[node]['alloc'][i]
if alloc['master'] == socket.getfqdn():
doc = db[alloc['task']]
if 'started' in doc:
del doc['started']
if 'node' in doc:
del doc['node']
db.save(doc)
node_doc = db[nodes[node]['_id']]
node_doc['alloc'].pop(i)
db.save(node_doc)
sys.exit(0)
