def get_file(self, ref):
"""
Get the content of a file from the repo.
"""
ref = ref.strip('"\'')
ref = terms.loads(ref)
return self.get_blob(ref['sha1'])[0]
def rules(self):
'''List the rules'''
rules_dict = terms.loads(self.etb().get_rules())
for file, rules in rules_dict.iteritems():
print('Rules from file {0}:\n---------'.format(file))
for rule in rules:
print('{0}'.format(rule))
def all_claims(self):
"""all_claims: Print all the claims established so far
Prints a table listing all the claims established up to the present.
This includes past sessions."""
cs = terms.loads(self.etb().get_all_claims())
self.print_claims(cs, 'established so far')
def ping(self, from_id, from_port, to_id, payload=None):
"""
Called by a remote node to notify that it is still alive.
Some additional data may be piggybacked in the payload.
"""
self.add_neighbor(from_id, from_port)
node = self.neighbor(from_id)
payload = terms.loads(payload) if payload else {}
if node:
assert isinstance(node, ETBNode), 'node not an ETBNode'
node.touch()
ip = self._get_incoming_ip()
if ip is None:
return
node.add_host(ip)
assert node.port == from_port, "port should not change"
with node._rlock:
if 'load' in payload:
node.load = int(payload['load'])
if 'predicates' in payload:
if node.predicates != payload['predicates']:
# Find new ones
newpreds = set(payload['predicates']) - node.predicates
node.predicates.clear()
node.predicates = payload['predicates']
self.log.debug('Adding changes to predicates')
self.etb.update_predicates(newpreds)
if 'subscriptions' in payload:
node.subscriptions.clear()
node.subscriptions.update(payload['subscriptions'])
if 'to_hosts' in payload:
with self._rlock:
self._hosts.update(payload['to_hosts'])
return to_id == self.id
def interpret_goal_remotely(self, from_id, goals, query_id):
"""
Goal interpretation through a tunnel.
"""
goals = terms.loads(goals)
self.log.debug('Remote query: %s for %s' % (goals, from_id))
node = self.get_link(from_id)
if node is None:
self.log.error('Remote request unknown link node: %s' % from_id)
return False
self.log.debug('Remote node: %s', node)
proxy = node.proxy
if proxy is None:
self.log.error('No proxy available for link node: %s' % from_id)
return False
self.etb.get_goals_dependencies(goals, proxy)
def task_interpret(etb, query_id=query_id, goals=goals):
query = self.etb.create_query((goals,))
self.query_wait(query)
answer = terms.dumps(self.etb.query_answers(query))
def task(etb, query_id=query_id, answer=answer):
proxy.answer_query(query_id, answer)
etb.short_pool.schedule(task)
self.etb.long_pool.schedule(task_interpret)
return True
def claims(self, q):
'''claims($q): show claims established by query q'''
cs = terms.loads(self.etb().query_claims(q))
self.print_claims(cs, 'established by query %s' % q)
if len(cs) == 1:
return terms.dumps(cs[0])
else:
return [terms.dumps(c) for c in cs]
def facts(self, all=False):
'''List the facts'''
facts_dict = terms.loads(self.etb().get_facts())
print('facts_dict = {0}'.format(facts_dict))
for file, facts in facts_dict.iteritems():
print('Facts from file {0}:\n---------'.format(file))
for fact in facts:
print('{0}.'.format(fact))
def answers(self, q):
'''answers($q): print the answers to a query q'''
output = self.etb().query_answers(q)
if output:
answers = terms.loads(output)
print('\nAnswers for query %s' % q)
print('==================================================')
if answers:
for s in answers:
print(s)
else:
print('(no answer)')
print('')
return self.translate_answers(output)
def task(etb, neighbor=neighbor):
"""Fetch neighbors task"""
proxy = neighbor.proxy
if proxy is not None:
neighbors = proxy.get_neighbors()
# parse it as a list
neighbors = terms.loads(neighbors)
for nid, hosts, port, timestamp in neighbors:
if time.time() - timestamp < etb.config.node_timeout:
# the neighbor has been seen recently by someone, it
# makes sense to add it (if it's not already known)
etb.networking.add_neighbor(nid, port)
nbr = etb.networking.neighbor(nid)
if nbr:
nbr.add_hosts(hosts)
# trust the remote node, and use its timestamp
nbr.timestamp = timestamp
def add_link(self, nid, to_port, my_port, predicates):
"""Add this node as a new tunnel link."""
new_node = False
with self._rlock:
if nid not in self._links:
node = ETBNode(self.log, nid, to_port)
node.my_port = my_port
node.add_host('localhost')
node.predicates = terms.loads(predicates) if predicates else {}
self._links[nid] = node
new_node = True
else:
node = self._links[nid]
assert node is not None, 'Node is None in add_link'
if new_node:
self.log.debug('Connected to tunnel ETB node: %s' % nid)
self.log.debug('node = %s' % node)
poke_link(self.etb, node)
def answer_query(self, query_id, answer):
"""
Add an answer to the query. The answer must be a JSON-encoded
substitution.
"""
try:
self.log.debug('Received JSON answer {0}'.format(answer))
answer = terms.loads(answer)
self.log.debug('Received answer to %s' % query_id)
self.log.debug('answer_query: answer = %s' % answer)
with self.etb._rlock:
if query_id in self.etb.active_remote_queries:
(goal, nid, argspecs, node) = self.etb.active_remote_queries[query_id]
self.log.debug('answer_query: goal = {0}: {1}'.format(goal, type(goal)))
self.etb.process_interpreted_goal_answer(argspecs, goal, node, answer)
del self.etb.active_remote_queries[query_id]
except:
return False
return True
def add_proxy_link(self, nid, proxy_host, proxy_port, proxy_name, local_name, predicates):
"""Add this node as a new proxy link."""
new_node = False
with self._rlock:
if nid not in self._links:
node = ETBNode(self.log, nid, proxy_port)
node.add_host(proxy_host)
node.proxy_host = proxy_host
node.remote_name = proxy_name
node.local_name = local_name
node.predicates = terms.loads(predicates) if predicates else {}
self._links[nid] = node
new_node = True
else:
node = self._links[nid]
assert node is not None, 'Node is None in add_proxy_link'
if new_node:
self.log.debug('Connected to proxied ETB node: %s' % nid)
self.log.debug('node = %s' % node)
poke_link(self.etb, node)
def get_contents_from_network(self, sha1, seen=None):
self.log.debug('Being asked over the wire for %s' % sha1)
contents = None
execp = False
#do I have it?
if self.etb.git.has_blob(sha1):
contents = self.etb.git.get_blob(sha1)[0]
if contents is not None and contents is not '':
self.log.debug('I have %s!' % sha1)
execp = False
else:
seen = terms.loads(seen) if seen else []
contents, execp = self.get_contents_from_somewhere(sha1, seen)
if contents is not None and contents is not '':
b64_contents = base64.b64encode(contents)
else:
b64_contents = ''
return b64_contents, execp
def errors(self, q):
'''errors($q): print error claims of query q
If a query generates an error, e.g., a wrapper throws an exception,
then a special error claim is created. This command lists just the
error claims, if any, for query q.
'''
output = self.etb().query_claims(q)
if output:
answers = terms.loads(output)
answers = [
a for a in answers if isinstance(a, terms.Literal)
and a.first_symbol() == terms.mk_idconst('error')
]
if len(answers) > 0:
print('\nErrors:')
print('======')
for a in answers:
print(a)
else:
print('No errors')
def interpret_goal(self, from_id, goals, query_id):
"""
Given the goal (a JSON-encoded list of possibly interpret terms),
schedule it to be interpreted by a tool wrapper and to send back the
results to from_id.
Returns True on success, False on failure.
"""
goals = terms.loads(goals)
self.log.debug('Asked by %s to interpret %s', from_id, goals)
def task_interpret(etb, query_id=query_id, goals=goals):
query = self.etb.create_query((goals,))
self.query_wait(query)
if False:
filename = self.etb.engine.goal_deps_to_png(goals)
os.rename(filename, "%s.png" % goals)
self.log.debug("answering_png.png for %s dumped to %s" % (goals, os.getcwd()))
ans = self.etb.query_answers(query)
answer = terms.dumps(ans)
self.log.debug('task_interpret: answer to query is: %s' % answer)
def task(etb, query_id=query_id, answer=answer):
if from_id in self._neighbors:
proxy = self.neighbor(from_id).proxy
else:
print('setting proxy to None')
proxy = None
if proxy is not None:
self.log.debug('Sending query answer to %s', from_id)
# I don't know why, but at some point the following
# started raising the exception printing proxy:
# method "__unicode__" is not supported
#self.log.info('proxy for %s is %s' % (from_id, proxy))
self.log.debug('_neighbors = %s' % self._neighbors)
proxy.answer_query(query_id, answer)
etb.short_pool.schedule(task)
self.etb.long_pool.schedule(task_interpret)
return True
def all_claims(self):
'''Loads the JSON result of the all_claims method'''
claims = self.etb().all_claims()
return sorted(terms.loads(claims))
def query_claims(self, query):
'''Loads the JSON result of the query_claims method'''
claims = self.etb().query_claims(query)
return terms.loads(claims)
def find_claims(self, pattern, reasons=False):
"""find_claims: Find claims matching pattern"""
cs = terms.loads(self.etb().find_claims(pattern, reasons))
return cs
def query_answers(self, query):
'''Loads the JSON result of the query_answers method'''
answers = self.etb().query_answers(query)
if answers:
return terms.loads(answers)
def translate_answers(self, output):
# print('translate_answers: output = %s of type %s' % (output, type(output))))
substs = terms.loads(output)
return substs
