PK!==cc_agency/__init__.pyfrom cc_agency.version import VERSION __version__ = VERSION PK!cc_agency/broker/__init__.pyPK! Z]]cc_agency/broker/app.pyfrom argparse import ArgumentParser from flask import Flask, jsonify, request from werkzeug.exceptions import Unauthorized import zmq from cc_core.version import VERSION as CORE_VERSION from cc_agency.version import VERSION as AGENCY_VERSION from cc_agency.commons.conf import Conf from cc_agency.commons.db import Mongo from cc_agency.broker.auth import Auth from cc_agency.broker.routes.red import red_routes from cc_agency.broker.routes.nodes import nodes_routes from cc_agency.broker.routes.callback import callback_routes from cc_agency.broker.routes.auth import auth_routes DESCRIPTION = 'CC-Agency Broker.' app = Flask('broker') application = app parser = ArgumentParser(description=DESCRIPTION) parser.add_argument( '-c', '--conf-file', action='store', type=str, metavar='CONF_FILE', help='CONF_FILE (yaml) as local path.' ) args = parser.parse_args() conf = Conf(args.conf_file) mongo = Mongo(conf) auth = Auth(conf, mongo) context = zmq.Context() controller = context.socket(zmq.PUSH) controller.connect(conf.d['controller']['external_url']) @app.route('/', methods=['GET']) def get_root(): return jsonify({'Hello': 'World'}) @app.route('/version', methods=['GET']) def get_version(): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() return jsonify({ 'agencyVersion': AGENCY_VERSION, 'coreVersion': CORE_VERSION }) red_routes(app, mongo, auth, controller) nodes_routes(app, mongo, auth) callback_routes(app, mongo, auth, conf, controller) auth_routes(app, auth, conf) controller.send_json({'destination': 'scheduler'}) PK!l:llcc_agency/broker/auth.pyfrom os import urandom from time import time from cc_agency.commons.helper import generate_secret, get_ip, create_kdf class Auth: def __init__(self, conf, mongo): self._num_login_attempts = conf.d['broker']['auth']['num_login_attempts'] self._block_for_seconds = conf.d['broker']['auth']['block_for_seconds'] self._tokens_valid_for_seconds = conf.d['broker']['auth']['tokens_valid_for_seconds'] self._mongo = mongo def create_user(self, username, password, is_admin): salt = urandom(16) kdf = create_kdf(salt) user = { 'username': username, 'password': kdf.derive(password.encode('utf-8')), 'salt': salt, 'is_admin': is_admin } self._mongo.db['users'].update_one({'username': username}, {'$set': user}, upsert=True) def verify_user(self, auth): if not auth: return None username = auth.username password = auth.password user = self._mongo.db['users'].find_one({'username': username}) user['verified_by_credentials'] = False if not user: return None salt = user['salt'] del user['salt'] if not user: return None if self._is_blocked_temporarily(user): return None if self._verify_user_by_token(user, password): return user if self._verify_user_by_credentials(user, password, salt): user['verified_by_credentials'] = True return user self._add_block_entry(user) return None def _is_blocked_temporarily(self, user): self._mongo.db['block_entries'].delete_many({'timestamp': {'$lt': time() - self._block_for_seconds}}) block_entries = list(self._mongo.db['block_entries'].find({'username': user['username']})) if len(block_entries) > self._num_login_attempts: return True return False def _add_block_entry(self, username): self._mongo.db['block_entries'].insert_one({ 'username': username, 'timestamp': time() }) print('Unverified login attempt: added block entry!') def issue_token(self, user): salt = urandom(16) kdf = create_kdf(salt) token = generate_secret() self._mongo.db['tokens'].insert_one({ 'username': user['username'], 'ip': get_ip(), 'salt': salt, 'token': kdf.derive(token.encode('utf-8')), 'timestamp': time() }) return token def _verify_user_by_token(self, user, token): self._mongo.db['tokens'].delete_many({'timestamp': {'$lt': time() - self._tokens_valid_for_seconds}}) cursor = self._mongo.db['tokens'].find( {'username': user['username'], 'ip': get_ip()}, {'token': 1, 'salt': 1} ) for c in cursor: try: kdf = create_kdf(c['salt']) kdf.verify(token.encode('utf-8'), c['token']) return True except: pass return False def verify_callback(self, batch_id, token): self._mongo.db['callback_tokens'].delete_many({'timestamp': {'$lt': time() - self._tokens_valid_for_seconds}}) cursor = self._mongo.db['callback_tokens'].find( {'batch_id': batch_id}, {'token': 1, 'salt': 1} ) for c in cursor: try: kdf = create_kdf(c['salt']) kdf.verify(token.encode('utf-8'), c['token']) return True except: pass return False @staticmethod def _verify_user_by_credentials(user, password, salt): kdf = create_kdf(salt) try: kdf.verify(password.encode('utf-8'), user['password']) except: return False return True PK!#cc_agency/broker/routes/__init__.pyPK!xXggcc_agency/broker/routes/auth.pyfrom flask import jsonify, request from werkzeug.exceptions import Unauthorized def auth_routes(app, auth, conf): tokens_valid_for_seconds = conf.d['broker']['auth']['tokens_valid_for_seconds'] @app.route('/token', methods=['GET']) def get_token(): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() if not user['verified_by_credentials']: raise Unauthorized() token = auth.issue_token(user) return jsonify({ 'token': token, 'validForSeconds': tokens_valid_for_seconds }) PK! ؇ #cc_agency/broker/routes/callback.pyfrom time import time import jsonschema from flask import request, jsonify from werkzeug.exceptions import Unauthorized, NotFound, BadRequest from bson.objectid import ObjectId from cc_agency.commons.schemas.callback import callback_schema from cc_agency.commons.helper import batch_failure def callback_routes(app, mongo, auth, conf, controller): @app.route('/callback//', methods=['GET']) def get_callback(batch_id, token): if not auth.verify_callback(batch_id, token): raise Unauthorized() batch = mongo.db['batches'].find_one( {'_id': ObjectId(batch_id), 'state': 'processing'} ) if not batch: raise NotFound('Object not found.') experiment_id = batch['experimentId'] experiment = mongo.db['experiments'].find_one( {'_id': ObjectId(experiment_id)} ) result = { 'redVersion': experiment['redVersion'], 'cli': experiment['cli'], 'inputs': batch['inputs'], 'outputs': batch['outputs'] } return jsonify(result) @app.route('/callback//', methods=['POST']) def post_callback(batch_id, token): if not auth.verify_callback(batch_id, token): raise Unauthorized() try: bson_id = ObjectId(batch_id) except Exception: raise BadRequest('Not a valid BSON ObjectId.') batch = mongo.db['batches'].find_one( {'_id': bson_id, 'state': 'processing'}, {'attempts': 1, 'node': 1} ) if not batch: raise NotFound('Object not found.') if not request.json: debug_info = 'Callback did not send CC-Agent data as JSON.' batch_failure(mongo, batch_id, debug_info, None, conf) raise BadRequest(debug_info) data = request.json try: jsonschema.validate(data, callback_schema) except Exception: debug_info = 'CC-Agent data sent by callback does not comply with jsonschema.' batch_failure(mongo, batch_id, debug_info, data, conf) raise BadRequest(debug_info) if data['state'] == 'failed': debug_info = 'Callback sent state "failed".' batch_failure(mongo, batch_id, debug_info, data, conf) return '', 200 mongo.db['batches'].update( {'_id': bson_id}, { '$set': { 'state': 'succeeded' }, '$push': { 'history': { 'state': 'succeeded', 'time': time(), 'debugInfo': None, 'node': batch['node'], 'ccagent': data } } } ) controller.send_json({'destination': 'scheduler'}) return '', 200 PK!=* XX cc_agency/broker/routes/nodes.pyfrom flask import jsonify, request from werkzeug.exceptions import Unauthorized from bson.objectid import ObjectId def nodes_routes(app, mongo, auth): @app.route('/nodes', methods=['GET']) def get_nodes(): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() cursor = mongo.db['nodes'].find() nodes = list(cursor) node_names = [node['nodeName'] for node in nodes] cursor = mongo.db['batches'].find( {'node': {'$in': node_names}, 'state': 'processing'}, {'experimentId': 1, 'node': 1} ) batches = list(cursor) experiment_ids = list(set([ObjectId(b['experimentId']) for b in batches])) cursor = mongo.db['experiments'].find( {'_id': {'$in': experiment_ids}}, {'container.settings.ram': 1} ) experiments = {str(e['_id']): e for e in cursor} for node in nodes: batches_ram = [ { 'batchId': str(b['_id']), 'ram': experiments[b['experimentId']]['container']['settings']['ram'] } for b in batches if b['node'] == node['nodeName'] ] node['currentBatches'] = batches_ram del node['_id'] return jsonify(nodes) PK!cW((cc_agency/broker/routes/red.pyimport jsonschema from traceback import format_exc from time import time from flask import jsonify, request from werkzeug.exceptions import Unauthorized, BadRequest, NotFound from bson.objectid import ObjectId from cc_core.commons.schemas.red import red_schema from cc_core.commons.engines import engine_validation from cc_core.commons.templates import inspect_templates_and_secrets from cc_core.commons.exceptions import exception_format from cc_agency.commons.helper import str_to_bool def _prepare_red_data(data, user): timestamp = time() experiment = { 'username': user['username'], 'registrationTime': timestamp, 'redVersion': data['redVersion'], 'cli': data['cli'], 'container': data['container'], 'protectedKeysVoided': False } if 'execution' in data: stripped_settings = {} for key, val in data['execution']['settings'].items(): if key == 'access': continue stripped_settings[key] = val experiment['execution'] = { 'engine': data['execution']['engine'], 'settings': stripped_settings } if 'batches' in data: raw_batches = data['batches'] else: raw_batches = [{ 'inputs': data['inputs'], 'outputs': data['outputs'] }] batches = [] for rb in raw_batches: batches.append({ 'username': user['username'], 'registrationTime': timestamp, 'state': 'registered', 'protectedKeysVoided': False, 'node': None, 'history': [{ 'state': 'registered', 'time': timestamp, 'debugInfo': None, 'node': None, 'ccagent': None }], 'attempts': 0, 'inputs': rb['inputs'], 'outputs': rb['outputs'] }) return experiment, batches def red_routes(app, mongo, auth, controller): @app.route('/red', methods=['POST']) def post_red(): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() if not request.json: raise BadRequest('Did not send RED data as JSON.') data = request.json try: jsonschema.validate(data, red_schema) except Exception: raise BadRequest('Given RED data does not comply with jsonschema. ' 'Consider using the FAICE commandline tools for local validation.') try: _, secret_values = inspect_templates_and_secrets(data, None, True) except Exception: raise BadRequest(format_exc()) if 'batches' in data: for batch in data['batches']: if 'outputs' not in batch: raise BadRequest( 'CC-Agency requires all batches to have outputs defined. At least one batch does not comply.' ) elif 'outputs' not in data: raise BadRequest('CC-Agency requires outputs to be defined in RED data.') try: engine_validation(data, 'container', ['docker']) except Exception: raise BadRequest('\n'.join(exception_format(secret_values=secret_values))) if 'ram' not in data['container']['settings']: raise BadRequest('CC-Agency requires ram to the be defined in container settings.') try: engine_validation(data, 'execution', ['ccagency'], optional=True) except Exception: raise BadRequest('\n'.join(exception_format(secret_values=secret_values))) experiment, batches = _prepare_red_data(data, user) bson_experiment_id = mongo.db['experiments'].insert_one(experiment).inserted_id experiment_id = str(bson_experiment_id) for batch in batches: batch['experimentId'] = experiment_id mongo.db['batches'].insert_many(batches) controller.send_json({'destination': 'scheduler'}) return jsonify({'experimentId': experiment_id}) @app.route('/batches/', methods=['DELETE']) def delete_batches(object_id): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() try: bson_id = ObjectId(object_id) except Exception: raise BadRequest('Not a valid BSON ObjectId.') match = {'_id': bson_id} match_with_state = {'_id': bson_id, 'state': {'$nin': ['succeeded', 'failed', 'cancelled']}} if not user['is_admin']: match['username'] = user['username'] match_with_state['username'] = user['username'] o = mongo.db['batches'].find_one(match, {'state': 1}) if not o: raise NotFound('Could not find Object.') mongo.db['batches'].update_one(match_with_state, {'$set': {'state': 'cancelled'}}) o = mongo.db['batches'].find_one(match) o['_id'] = str(o['_id']) controller.send_json({'destination': 'scheduler'}) return jsonify(o) @app.route('/experiments/count', methods=['GET']) def get_experiments_count(): return get_collection_count('experiments') @app.route('/experiments', methods=['GET']) def get_experiments(): return get_collection('experiments') @app.route('/experiments/', methods=['GET']) def get_experiments_id(object_id): return get_collection_id('experiments', object_id) @app.route('/batches/count', methods=['GET']) def get_batches_count(): return get_collection_count('batches') @app.route('/batches', methods=['GET']) def get_batches(): return get_collection('batches') @app.route('/batches/', methods=['GET']) def get_batches_id(object_id): return get_collection_id('batches', object_id) def get_collection_id(collection, object_id): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() try: bson_id = ObjectId(object_id) except Exception: raise BadRequest('Not a valid BSON ObjectId.') match = {'_id': bson_id} if not user['is_admin']: match['username'] = user['username'] o = mongo.db[collection].find_one(match) if not o: raise NotFound('Could not find Object.') o['_id'] = str(o['_id']) return jsonify(o) def get_collection_count(collection): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() username = request.args.get('username', default=None, type=str) node = None experiment_id = None state = None if collection == 'batches': node = request.args.get('node', default=None, type=str) state = request.args.get('state', default=None, type=str) experiment_id = request.args.get('experimentId', default=None, type=str) if experiment_id: try: _ = ObjectId(experiment_id) except Exception: raise BadRequest('Experiment is not a valid BSON ObjectId.') aggregate = [] if not user['is_admin']: aggregate.append({'$match': {'username': user['username']}}) match = {} if username: match['username'] = username if node: match['node'] = node if experiment_id: match['experimentId'] = experiment_id if state: match['state'] = state aggregate.append({'$match': match}) aggregate.append({'$count': 'count'}) cursor = mongo.db[collection].aggregate(aggregate) cursor = list(cursor) if not cursor: return jsonify({'count': 0}) return jsonify(cursor[0]) def get_collection(collection): user = auth.verify_user(request.authorization) if not user: raise Unauthorized() skip = request.args.get('skip', default=None, type=int) limit = request.args.get('limit', default=None, type=int) username = request.args.get('username', default=None, type=str) ascending = str_to_bool(request.args.get('ascending', default=None, type=str)) node = None experiment_id = None state = None if collection == 'batches': node = request.args.get('node', default=None, type=str) state = request.args.get('state', default=None, type=str) states = ['registered', 'processing', 'succeeded', 'failed', 'cancelled'] if state and state not in states: raise BadRequest('Given state is not valid. Must be one of {}.'.format(states)) experiment_id = request.args.get('experimentId', default=None, type=str) if experiment_id: try: _ = ObjectId(experiment_id) except Exception: raise BadRequest('Experiment is not a valid BSON ObjectId.') aggregate = [] if not user['is_admin']: aggregate.append({'$match': {'username': user['username']}}) match = {} if username: match['username'] = username if node: match['node'] = node if experiment_id: match['experimentId'] = experiment_id if state: match['state'] = state aggregate.append({'$match': match}) aggregate.append({'$project': { 'username': 1, 'registrationTime': 1, 'state': 1, 'experimentId': 1, 'node': 1 }}) aggregate.append({'$sort': {'registrationTime': 1 if ascending else -1}}) if skip is not None: if skip < 0: raise BadRequest('skip cannot be lower than 0.') aggregate.append({'$skip': skip}) if limit is not None: if limit < 1: raise BadRequest('limit cannot be lower than 1.') aggregate.append({'$limit': limit}) cursor = mongo.db[collection].aggregate(aggregate) result = [] for e in cursor: e['_id'] = str(e['_id']) result.append(e) return jsonify(result) PK!cc_agency/commons/__init__.pyPK!f"E cc_agency/commons/conf.pyimport os import jsonschema from ruamel.yaml import YAML from cc_agency.commons.schemas.conf import conf_schema class Conf: def __init__(self, conf_file_path): if not conf_file_path: conf_file_path = os.path.join('~', '.config', 'cc-agency.yml') conf_file_path = os.path.expanduser(conf_file_path) yaml = YAML(typ='safe') with open(conf_file_path) as f: self.d = yaml.load(f) jsonschema.validate(self.d, conf_schema) PK!%d/+;;cc_agency/commons/db.pyimport pymongo class Mongo: def __init__(self, conf): host = conf.d['mongo'].get('host', 'localhost') port = conf.d['mongo'].get('port', 27017) db = conf.d['mongo']['db'] username = conf.d['mongo']['username'] password = conf.d['mongo']['password'] self.client = pymongo.MongoClient('mongodb://{username}:{password}@{host}:{port}/{db}'.format( username=username, password=password, host=host, port=port, db=db )) self.db = self.client[db] PK!)cc_agency/commons/helper.pyfrom os import urandom from binascii import hexlify from time import time from flask import request from bson.objectid import ObjectId from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives.hashes import SHA256 from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC def get_ip(): headers = ['HTTP_X_FORWARDED_FOR', 'HTTP_X_REAL_IP', 'REMOTE_ADDR'] ip = None for header in headers: ip = request.environ.get(header) if ip: break if not ip: ip = '127.0.0.1' return ip def generate_secret(): return hexlify(urandom(24)).decode('utf-8') def create_kdf(salt): return PBKDF2HMAC( algorithm=SHA256(), length=32, salt=salt, iterations=100000, backend=default_backend() ) def batch_failure(mongo, batch_id, debug_info, ccagent, conf): bson_id = ObjectId(batch_id) batch = mongo.db['batches'].find_one( {'_id': bson_id}, {'attempts': 1, 'node': 1} ) timestamp = time() attempts = batch['attempts'] node_name = batch['node'] new_state = 'registered' new_node = None attempts_to_fail = conf.d['controller']['scheduling']['attempts_to_fail'] if attempts >= attempts_to_fail: new_state = 'failed' new_node = node_name mongo.db['batches'].update( {'_id': bson_id}, { '$set': { 'state': new_state, 'node': new_node }, '$push': { 'history': { 'state': new_state, 'time': timestamp, 'debugInfo': debug_info, 'node': new_node, 'ccagent': ccagent } } } ) def str_to_bool(s): if isinstance(s, str) and s.lower() in ['1', 'true']: return True return False PK!%cc_agency/commons/schemas/__init__.pyPK!TʐM%cc_agency/commons/schemas/callback.pyfrom cc_core.commons.schemas.common import pattern_key _files_schema = { 'type': 'object', 'patternProperties': { pattern_key: { 'type': 'object', 'properties': { 'isOptional': {'type': 'boolean'}, 'isArray': {'type': 'boolean'}, 'files': { 'type': 'array', 'items': { 'type': 'object', 'properties': { 'path': {'type': 'string'}, 'size': {'type': 'number'}, 'debugInfo': {'type': 'string'} }, 'additionalProperties': False, 'required': ['path', 'size', 'debugInfo'] } } }, 'additionalProperties': False, 'required': ['isOptional', 'isArray', 'files'] } }, 'additionalProperties': False } # TODO: Incomplete callback_schema = { 'type': 'object', 'properties': { 'state': {'enum': ['succeeded', 'failed']} }, 'additionalProperties': True, 'required': ['state'] } PK!zL!cc_agency/commons/schemas/conf.pyconf_schema = { 'type': 'object', 'properties': { 'broker': { 'type': 'object', 'properties': { 'external_url': {'type': 'string'}, 'auth': { 'type': 'object', 'properties': { 'num_login_attempts': {'type': 'integer'}, 'block_for_seconds': {'type': 'integer'}, 'tokens_valid_for_seconds': {'type': 'integer'} }, 'additionalProperties': False, 'required': ['num_login_attempts', 'block_for_seconds', 'tokens_valid_for_seconds'] } }, 'additionalProperties': False, 'required': ['external_url', 'auth'] }, 'controller': { 'type': 'object', 'properties': { 'external_url': {'type': 'string'}, 'bind_host': {'type': 'string'}, 'bind_port': {'type': 'integer'}, 'docker': { 'type': 'object', 'properties': { 'core_image': { 'type': 'object', 'properties': { 'url': {'type': 'string'}, 'auth': { 'type': 'object', 'properties': { 'username': {'type': 'string'}, 'password': {'type': 'string'} }, 'additionalProperties': False, 'required': ['username', 'password'] }, 'disable_pull': {'type': 'boolean'} }, 'additionalProperties': False, 'required': ['url'] }, 'nodes': { 'type': 'object', 'patternProperties': { '^[a-zA-Z0-9_-]+$': { 'type': 'object', 'properties': { 'base_url': {'type': 'string'}, 'tls': { 'type': 'object', 'properties': { 'verify': {'type': 'string'}, 'client_cert': { 'type': 'array', 'items': {'type': 'string'} }, 'assert_hostname': {'type': ['boolean', 'string']} }, 'additionalProperties': True } }, 'required': ['base_url'], 'additionalProperties': False } }, 'additionalProperties': False } }, 'additionalProperties': False, 'required': ['nodes'] }, 'scheduling': { 'type': 'object', 'properties': { 'strategy': {'enum': ['spread', 'binpack']}, 'attempts_to_fail': {'type': 'integer'} }, 'additionalProperties': False, 'required': ['strategy', 'attempts_to_fail'] } }, 'additionalProperties': False, 'required': ['external_url', 'bind_host', 'bind_port', 'docker', 'scheduling'] }, 'mongo': { 'type': 'object', 'properties': { 'host': {'type': 'string'}, 'port': {'type': 'integer'}, 'db': {'type': 'string'}, 'username': {'type': 'string'}, 'password': {'type': 'string'} }, 'additionalProperties': False, 'required': ['db', 'username', 'password'] } }, 'additionalProperties': False, 'required': ['broker', 'controller', 'mongo'] } PK! cc_agency/controller/__init__.pyPK!1"RR cc_agency/controller/__main__.pyfrom cc_agency.controller.main import main if __name__ == '__main__': main() PK!Sǎ**cc_agency/controller/docker.pyfrom os import urandom from queue import Queue from threading import Thread from time import time from traceback import format_exc import docker from bson.objectid import ObjectId from cc_agency.commons.helper import generate_secret, create_kdf, batch_failure class ClientProxy: def __init__(self, node_name, conf, mongo): self._node_name = node_name self._conf = conf self._mongo = mongo node_conf = conf.d['controller']['docker']['nodes'][node_name] self._base_url = node_conf['base_url'] self._tls = False if 'tls' in node_conf: self._tls = docker.tls.TLSConfig(**node_conf['tls']) self._external_url = conf.d['broker']['external_url'].rstrip('/') self._action_q = None self._client = None self._online = None node = { 'nodeName': node_name, 'state': None, 'history': [], 'ram': None, 'cpus': None } bson_node_id = self._mongo.db['nodes'].insert_one(node).inserted_id self._node_id = str(bson_node_id) try: self._client = docker.DockerClient(base_url=self._base_url, tls=self._tls, version='auto') ram, cpus = self._info() except Exception: self._set_offline(format_exc()) return self._action_q = Queue() Thread(target=self._action_loop).start() self._fail_processing_batches_without_assigned_container() self._set_online(ram, cpus) def _set_online(self, ram, cpus): print('Node online:', self._node_name) self._online = True bson_node_id = ObjectId(self._node_id) self._mongo.db['nodes'].update_one( {'_id': bson_node_id}, { '$set': { 'state': 'online', 'ram': ram, 'cpus': cpus }, '$push': { 'history': { 'state': 'online', 'time': time(), 'debugInfo': None } } } ) def _set_offline(self, debug_info): print('Node offline:', self._node_name) timestamp = time() self._online = False bson_node_id = ObjectId(self._node_id) self._mongo.db['nodes'].update_one( {'_id': bson_node_id}, { '$set': {'state': 'offline'}, '$push': { 'history': { 'state': 'offline', 'time': timestamp, 'debugInfo': debug_info } } } ) # change state of assigned batches cursor = self._mongo.db['batches'].find( {'node': self._node_name, 'state': 'processing'}, {'_id': 1} ) for batch in cursor: bson_id = batch['_id'] batch_id = str(bson_id) debug_info = 'Node offline: {}'.format(self._node_name) batch_failure(self._mongo, batch_id, debug_info, None, self._conf) def _info(self): info = self._client.info() ram = info['MemTotal'] // (1024 * 1024) cpus = info['NCPU'] return ram, cpus def _batch_containers(self, status): batch_containers = {} if not self._online: return batch_containers containers = self._client.containers.list(all=True, limit=-1, filters={'status': status}) for c in containers: try: ObjectId(c.name) batch_containers[c.name] = c except: pass return batch_containers def _fail_processing_batches_assigned_to_offline_node(self): running_containers = self._batch_containers(None) cursor = self._mongo.db['batches'].find( { 'node': self._node_name, 'state': 'processing' }, {'_id': 1} ) for batch in cursor: bson_id = batch['_id'] batch_id = str(bson_id) if batch_id not in running_containers: debug_info = 'Node offline.' batch_failure(self._mongo, batch_id, debug_info, None, self._conf) def _fail_processing_batches_without_assigned_container(self): running_containers = self._batch_containers(None) cursor = self._mongo.db['batches'].find( { 'node': self._node_name, 'state': 'processing' }, {'_id': 1} ) for batch in cursor: bson_id = batch['_id'] batch_id = str(bson_id) if batch_id not in running_containers: debug_info = 'No container assigned.' batch_failure(self._mongo, batch_id, debug_info, None, self._conf) def _remove_cancelled_containers(self): running_containers = self._batch_containers('running') cursor = self._mongo.db['batches'].find( { '_id': {'$in': [ObjectId(_id) for _id in running_containers]}, 'state': 'cancelled' }, {'_id': 1} ) for batch in cursor: bson_id = batch['_id'] batch_id = str(bson_id) c = running_containers[batch_id] c.remove(force=True) def _remove_exited_containers(self): exited_containers = self._batch_containers('exited') cursor = self._mongo.db['batches'].find( {'_id': {'$in': [ObjectId(_id) for _id in exited_containers]}}, {'state': 1} ) for batch in cursor: bson_id = batch['_id'] batch_id = str(bson_id) c = exited_containers[batch_id] debug_info = c.logs().decode('utf-8') c.remove() if batch['state'] not in ['succeeded', 'failed', 'cancelled']: batch_failure(self._mongo, batch_id, debug_info, None, self._conf) def inspect_offline_node(self): try: self._client = docker.DockerClient(base_url=self._base_url, tls=self._tls, version='auto') ram, cpus = self._info() self._inspect() except Exception: return self._action_q = Queue() Thread(target=self._action_loop).start() self._fail_processing_batches_without_assigned_container() self._set_online(ram, cpus) def _inspect(self): print('Node inspection:', self._node_name) core_image_conf = self._conf.d['controller']['docker']['core_image'] image = core_image_conf['url'] auth = core_image_conf.get('auth') command = 'ccagent connected {} --inspect'.format(self._external_url) disable_pull = self._conf.d['controller']['docker']['core_image'].get('disable_pull', False) if not disable_pull: self._client.images.pull(image, auth_config=auth) self._client.containers.run( image, command, user='1000:1000', remove=True ) def put_action(self, data): self._action_q.put(data) def _action_loop(self): while True: data = self._action_q.get() if 'action' not in data: continue action = data['action'] inspect = False if action == 'run_batch_container': try: self._run_batch_container(batch_id=data['batch_id']) except Exception: inspect = True self._run_batch_container_failure(data['batch_id'], format_exc()) elif action == 'pull_image': try: self._pull_image(image=data['url'], auth=data.get('auth')) except: inspect = True batch_ids = data['required_by'] self._pull_image_failure(format_exc(), batch_ids) elif action == 'clean_up': try: self._remove_cancelled_containers() self._remove_exited_containers() except: inspect = True if inspect: try: self._inspect() except Exception: self._set_offline(format_exc()) self._action_q = None self._client = None self._fail_processing_batches_assigned_to_offline_node() if not self._online: return def _run_batch_container(self, batch_id): batch = self._mongo.db['batches'].find_one( {'_id': ObjectId(batch_id), 'state': 'processing'}, {'experimentId': 1} ) if not batch: print('Batch "{}" not found for processing.'.format(batch_id)) return experiment_id = batch['experimentId'] experiment = self._mongo.db['experiments'].find_one( {'_id': ObjectId(experiment_id)}, { 'container.settings.image.url': 1, 'container.settings.ram': 1, 'execution.settings.outdir': 1} ) image = experiment['container']['settings']['image']['url'] token = generate_secret() salt = urandom(16) kdf = create_kdf(salt) self._mongo.db['callback_tokens'].insert_one({ 'batch_id': batch_id, 'salt': salt, 'token': kdf.derive(token.encode('utf-8')), 'timestamp': time() }) command = 'ccagent connected {}/callback/{}/{}'.format(self._external_url, batch_id, token) if 'execution' in experiment: outdir = experiment['execution']['settings'].get('outdir') if outdir: command = '{} --outdir {}'.format(command, outdir) ram = experiment['container']['settings']['ram'] mem_limit = '{}m'.format(ram) self._client.containers.run( image, command, name=batch_id, user='1000:1000', remove=False, detach=True, mem_limit=mem_limit, memswap_limit=mem_limit ) def _run_batch_container_failure(self, batch_id, debug_info): batch_failure(self._mongo, batch_id, debug_info, None, self._conf) def _pull_image(self, image, auth): self._client.images.pull(image, auth_config=auth) def _pull_image_failure(self, debug_info, batch_ids): for batch_id in batch_ids: batch_failure(self._mongo, batch_id, debug_info, None, self._conf) PK!Jdcc_agency/controller/main.pyfrom argparse import ArgumentParser import zmq from cc_core.version import VERSION as CORE_VERSION from cc_agency.version import VERSION as AGENCY_VERSION from cc_agency.commons.conf import Conf from cc_agency.commons.db import Mongo from cc_agency.controller.scheduler import Scheduler DESCRIPTION = 'CC-Agency Controller' def main(): print('CC-Agency Version:', AGENCY_VERSION) print('CC-Core Version:', CORE_VERSION) parser = ArgumentParser(description=DESCRIPTION) parser.add_argument( '-c', '--conf-file', action='store', type=str, metavar='CONF_FILE', help='CONF_FILE (yaml) as local path.' ) args = parser.parse_args() # Singletons conf = Conf(args.conf_file) mongo = Mongo(conf) scheduler = Scheduler(conf, mongo) context = zmq.Context() socket = context.socket(zmq.PULL) socket.bind('tcp://{}:{}'.format( conf.d['controller']['bind_host'], conf.d['controller']['bind_port'] )) while True: data = socket.recv_json() if 'destination' not in data: continue destination = data['destination'] if destination == 'scheduler': scheduler.schedule() PK!z**!cc_agency/controller/scheduler.pyfrom threading import Thread from queue import Queue from time import time, sleep from bson.objectid import ObjectId from cc_agency.controller.docker import ClientProxy from cc_agency.commons.helper import create_kdf from binascii import hexlify class Scheduler: def __init__(self, conf, mongo): self._conf = conf self._mongo = mongo mongo.db['nodes'].drop() self._scheduling_q = Queue(maxsize=1) self._inspection_q = Queue(maxsize=1) self._voiding_q = Queue(maxsize=1) self._nodes = { node_name: ClientProxy(node_name, conf, mongo) for node_name in conf.d['controller']['docker']['nodes'].keys() } Thread(target=self._scheduling_loop).start() Thread(target=self._inspection_loop).start() Thread(target=self._voiding_loop).start() Thread(target=self._cron).start() def _cron(self): while True: batch = self._mongo.db['batches'].find_one( {'state': {'$nin': ['succeeded', 'failed', 'cancelled']}}, {'_id': 1} ) if batch: self.schedule() sleep(60) def schedule(self): try: self._scheduling_q.put_nowait(None) except: pass def _inspection_loop(self): while True: self._inspection_q.get() print('inspecting...') cursor = self._mongo.db['nodes'].find( {'state': 'offline'}, {'nodeName': 1, 'state': 1} ) threads = [] for node in cursor: node_name = node['nodeName'] client_proxy = self._nodes[node_name] t = Thread(client_proxy.inspect_offline_node) t.start() threads.append(t) for t in threads: t.join() @staticmethod def _void_recursively(data, allowed_section): if isinstance(data, dict): result = {} for key, val in data.items(): if allowed_section and (key == 'password' or key.startswith('_')): kdf = create_kdf('fixedsalt'.encode('utf-8')) val_hash = kdf.derive(val.encode('utf-8')) val_hash = hexlify(val_hash).decode('utf-8') result[key] = '{{' + val_hash[-8:] + '}}' elif key in ['access', 'auth']: result[key] = Scheduler._void_recursively(val, True) else: result[key] = Scheduler._void_recursively(val, allowed_section) return result elif isinstance(data, list): return [Scheduler._void_recursively(val, allowed_section) for val in data] return data def _voiding_loop(self): while True: self._voiding_q.get() print('voiding...') # batches cursor = self._mongo.db['batches'].find( { 'state': {'$in': ['succeeded', 'failed', 'cancelled']}, 'protectedKeysVoided': False } ) for batch in cursor: bson_id = batch['_id'] del batch['_id'] data = Scheduler._void_recursively(batch, False) data['protectedKeysVoided'] = True self._mongo.db['batches'].update_one({'_id': bson_id}, {'$set': data}) # experiments cursor = self._mongo.db['experiments'].find( { 'protectedKeysVoided': False } ) for experiment in cursor: bson_id = experiment['_id'] experiment_id = str(bson_id) cursor = self._mongo.db['batches'].aggregate([ {'$match': {'experimentId': experiment_id}}, {'$count': 'count'} ]) all_count = list(cursor)[0]['count'] cursor = self._mongo.db['batches'].aggregate([ { '$match': { 'experimentId': experiment_id, 'state': {'$in': ['succeeded', 'failed', 'cancelled']} } }, {'$count': 'count'} ]) cursor = list(cursor) if cursor: finished_count = cursor[0]['count'] if all_count == finished_count: data = Scheduler._void_recursively(experiment, False) data['protectedKeysVoided'] = True self._mongo.db['experiments'].update_one({'_id': bson_id}, {'$set': data}) def _scheduling_loop(self): while True: self._scheduling_q.get() print('scheduling...') # inspect offline nodes try: self._inspection_q.put_nowait(None) except: pass # void protected keys try: self._voiding_q.put_nowait(None) except: pass # schedule self._schedule_batches() # clean up online nodes cursor = self._mongo.db['nodes'].find( {'state': 'online'}, {'nodeName': 1} ) for node in cursor: node_name = node['nodeName'] client_proxy = self._nodes[node_name] client_proxy.put_action({'action': 'clean_up'}) def _online_nodes(self): cursor = self._mongo.db['nodes'].find( {'state': 'online'}, {'ram': 1, 'nodeName': 1} ) nodes = list(cursor) node_names = [node['nodeName'] for node in nodes] cursor = self._mongo.db['batches'].find( {'node': {'$in': node_names}, 'state': 'processing'}, {'experimentId': 1, 'node': 1} ) batches = list(cursor) experiment_ids = list(set([ObjectId(b['experimentId']) for b in batches])) cursor = self._mongo.db['experiments'].find( {'_id': {'$in': experiment_ids}}, {'container.settings.ram': 1} ) experiments = {str(e['_id']): e for e in cursor} for node in nodes: used_ram = sum([ experiments[b['experimentId']]['container']['settings']['ram'] for b in batches if b['node'] == node['nodeName'] ]) node['freeRam'] = node['ram'] - used_ram node['scheduledImages'] = {} node['scheduledBatches'] = [] return nodes def _schedule_batches(self): nodes = self._online_nodes() strategy = self._conf.d['controller']['scheduling']['strategy'] timestamp = time() experiments = {} # select batch to be scheduled for batch in self._fifo(): batch_id = str(batch['_id']) experiment_id = batch['experimentId'] experiment = experiments.get(experiment_id) if not experiment: experiment = self._mongo.db['experiments'].find_one( {'_id': ObjectId(experiment_id)}, {'container.settings': 1, 'execution.settings': 1} ) experiments[experiment_id] = experiment ram = experiment['container']['settings']['ram'] # select node possible_nodes = [node for node in nodes if node['freeRam'] >= ram] if len(possible_nodes) == 0: continue if strategy == 'spread': possible_nodes.sort(reverse=True, key=lambda n: n['freeRam']) elif strategy == 'binpack': possible_nodes.sort(reverse=False, key=lambda n: n['freeRam']) selected_node = possible_nodes[0] selected_node['freeRam'] -= ram # schedule image pull on selected node disable_pull = False if 'execution' in experiment: disable_pull = experiment['execution']['settings'].get('disablePull', False) if not disable_pull: image_data = [experiment['container']['settings']['image']['url']] auth = experiment['container']['settings']['image'].get('auth') if auth: image_data += [auth['username'], auth['password']] image_data = tuple(image_data) if image_data not in selected_node['scheduledImages']: selected_node['scheduledImages'][image_data] = [] selected_node['scheduledImages'][image_data].append(batch_id) # schedule batch on selected node selected_node['scheduledBatches'].append(batch) # update batch data self._mongo.db['batches'].update_one( {'_id': batch['_id']}, { '$set': { 'state': 'processing', 'node': selected_node['nodeName'] }, '$push': { 'history': { 'state': 'processing', 'time': timestamp, 'debugInfo': None, 'node': selected_node['nodeName'], 'ccagent': None } }, '$inc': { 'attempts': 1 } } ) # inform node ClientProxies for node in nodes: node_name = node['nodeName'] client_proxy = self._nodes[node_name] for image, required_by in node['scheduledImages'].items(): data = { 'action': 'pull_image', 'url': image[0], 'required_by': required_by } if len(image) == 3: data['auth'] = { 'username': image[1], 'password': image[2] } client_proxy.put_action(data) for batch in node['scheduledBatches']: batch_id = str(batch['_id']) data = { 'action': 'run_batch_container', 'batch_id': batch_id } client_proxy.put_action(data) def _fifo(self): cursor = self._mongo.db['batches'].aggregate([ {'$match': {'state': 'registered'}}, {'$sort': {'registrationTime': 1}}, {'$project': {'experimentId': 1}} ]) for b in cursor: yield b PK!cc_agency/tools/__init__.pyPK!MMcc_agency/tools/__main__.pyfrom cc_agency.tools.main import main if __name__ == '__main__': main() PK!.cc_agency/tools/create_broker_user/__init__.pyPK!Gl``.cc_agency/tools/create_broker_user/__main__.pyfrom cc_agency.tools.create_broker_user.main import main if __name__ == '__main__': main() PK!la*cc_agency/tools/create_broker_user/main.pyfrom argparse import ArgumentParser from getpass import getpass from cc_agency.commons.conf import Conf from cc_agency.commons.db import Mongo from cc_agency.broker.auth import Auth DESCRIPTION = 'Create a broker user to authenticate with the web API.' def attach_args(parser): parser.add_argument( '-c', '--conf-file', action='store', type=str, metavar='CONF_FILE', help='CONF_FILE (yaml) as local path.' ) def main(): parser = ArgumentParser(description=DESCRIPTION) attach_args(parser) args = parser.parse_args() return run(**args.__dict__) def run(conf_file): conf = Conf(conf_file) mongo = Mongo(conf) auth = Auth(conf, mongo) print('You are in the process of creating a user account.') print('ATTENTION: an already existing user with the exact same username will be updated with new settings!') input('Hit [ENTER] to proceed...') username = input('Username: ') if not username: print('ABORT: username must not be empty.') exit(1) password = getpass('Password: ') if not password: print('ABORT: password must not be empty.') is_admin = input('Grant admin rights [y/N]: ') is_admin = is_admin.lower() is_admin = is_admin == 'yes' or is_admin == 'y' if is_admin: print('Admin privileges GRANTED!') else: print('Admin privileges NOT granted!') auth.create_user(username, password, is_admin=is_admin) print('Done!') PK!*cc_agency/tools/create_db_user/__init__.pyPK!k\\*cc_agency/tools/create_db_user/__main__.pyfrom cc_agency.tools.create_db_user.main import main if __name__ == '__main__': main() PK!r&cc_agency/tools/create_db_user/main.pyimport json from argparse import ArgumentParser from subprocess import call from time import sleep from cc_agency.commons.conf import Conf DESCRIPTION = 'Create a MongoDB admin user with read and write access, as specified in cc-agency configuration.' def attach_args(parser): parser.add_argument( '-c', '--conf-file', action='store', type=str, metavar='CONF_FILE', help='CONF_FILE (yaml) as local path.' ) parser.add_argument( '--host', action='store', type=str, metavar='HOST', help='Overwrite MongoDB host specified in CONF_FILE.' ) def main(): parser = ArgumentParser(description=DESCRIPTION) attach_args(parser) args = parser.parse_args() return run(**args.__dict__) def run(conf_file, host): conf = Conf(conf_file) host = host if host else conf.d['mongo'].get('host', 'localhost') port = conf.d['mongo'].get('port', 27017) db = conf.d['mongo']['db'] username = conf.d['mongo']['username'] password = conf.d['mongo']['password'] data = { 'pwd': password, 'roles': [{ 'role': 'readWrite', 'db': db }] } dumped = json.dumps(data) update_command = 'mongo --host {host} --port {port} --eval \'database = db.getSiblingDB("{db}"); database.updateUser("{username}", {dumped})\''.format( host=host, port=port, db=db, username=username, dumped=dumped ) data['user'] = username dumped = json.dumps(data) create_command = 'mongo --host {host} --port {port} --eval \'database = db.getSiblingDB("{db}"); database.createUser({dumped})\''.format( host=host, port=port, db=db, dumped=dumped ) for _ in range(10): code = call(update_command, shell=True) if code == 0: break else: code = call(create_command, shell=True) if code == 0: break sleep(1) PK!/cc_agency/tools/drop_db_collections/__init__.pyPK!LQaa/cc_agency/tools/drop_db_collections/__main__.pyfrom cc_agency.tools.drop_db_collections.main import main if __name__ == '__main__': main() PK!4w+cc_agency/tools/drop_db_collections/main.pyfrom argparse import ArgumentParser from cc_agency.commons.conf import Conf from cc_agency.commons.db import Mongo DESCRIPTION = 'Drop MongoDB collections.' def attach_args(parser): parser.add_argument( '-c', '--conf-file', action='store', type=str, metavar='CONF_FILE', help='CONF_FILE (yaml) as local path.' ) parser.add_argument( action='store', type=str, nargs='+', metavar='COLLECTIONS', dest='collections', choices=['experiments', 'batches', 'users', 'tokens', 'block_entries', 'callback_tokens'], help='Collections to be dropped.' ) def main(): parser = ArgumentParser(description=DESCRIPTION) attach_args(parser) args = parser.parse_args() return run(**args.__dict__) def run(conf_file, collections): conf = Conf(conf_file) mongo = Mongo(conf) for collection in collections: mongo.db[collection].drop() PK!incc_agency/tools/main.pyimport sys from collections import OrderedDict from argparse import ArgumentParser from cc_agency.version import VERSION from cc_agency.tools.create_db_user.main import main as create_db_user_main from cc_agency.tools.create_broker_user.main import main as create_broker_user_main from cc_agency.tools.drop_db_collections.main import main as drop_db_collections_main from cc_agency.tools.create_db_user.main import DESCRIPTION as CREATE_DB_USER_DESCRIPTION from cc_agency.tools.create_broker_user.main import DESCRIPTION as CREATE_BROKER_USER_DESCRIPTION from cc_agency.tools.drop_db_collections.main import DESCRIPTION as DROP_DB_COLLECTIONS_DESCRIPTION SCRIPT_NAME = 'ccagency' DESCRIPTION = 'CC-Agency Copyright (C) 2018 Christoph Jansen. This software is distributed under the AGPL-3.0 ' \ 'LICENSE and is part of the Curious Containers project (https://curious-containers.github.io/).' MODES = OrderedDict([ ('create-db-user', {'main': create_db_user_main, 'description': CREATE_DB_USER_DESCRIPTION}), ('create-broker-user', {'main': create_broker_user_main, 'description': CREATE_BROKER_USER_DESCRIPTION}), ('drop-db-collections', {'main': drop_db_collections_main, 'description': DROP_DB_COLLECTIONS_DESCRIPTION}) ]) def main(): sys.argv[0] = SCRIPT_NAME parser = ArgumentParser(description=DESCRIPTION) parser.add_argument( '-v', '--version', action='version', version=VERSION ) subparsers = parser.add_subparsers(title='modes') sub_parser = None for key, val in MODES.items(): sub_parser = subparsers.add_parser(key, help=val['description'], add_help=False) if len(sys.argv) < 2: parser.print_help() exit() _ = parser.parse_known_args() sub_args = sub_parser.parse_known_args() mode = MODES[sub_args[1][0]]['main'] sys.argv[0] = '{} {}'.format(SCRIPT_NAME, sys.argv[1]) del sys.argv[1] exit(mode()) PK! *cc_agency/version.pyRED_VERSION = '5' CC_VERSION = '3' PACKAGE_VERSION = '4' VERSION = '{}.{}.{}'.format(RED_VERSION, CC_VERSION, PACKAGE_VERSION) PK!H@Bi*cc_agency-5.3.4.dist-info/entry_points.txtN+I/N.,()JNNLOKMNJsr3@\.PsIQ~NNjj .PK!ۆۆ!cc_agency-5.3.4.dist-info/LICENSE GNU AFFERO GENERAL PUBLIC LICENSE Version 3, 19 November 2007 Copyright (C) 2007 Free Software Foundation, Inc. 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You may convey a covered work in object code form under the terms of sections 4 and 5, provided that you also convey the machine-readable Corresponding Source under the terms of this License, in one of these ways: a) Convey the object code in, or embodied in, a physical product (including a physical distribution medium), accompanied by the Corresponding Source fixed on a durable physical medium customarily used for software interchange. b) Convey the object code in, or embodied in, a physical product (including a physical distribution medium), accompanied by a written offer, valid for at least three years and valid for as long as you offer spare parts or customer support for that product model, to give anyone who possesses the object code either (1) a copy of the Corresponding Source for all the software in the product that is covered by this License, on a durable physical medium customarily used for software interchange, for a price no more than your reasonable cost of physically performing this conveying of source, or (2) access to copy the Corresponding Source from a network server at no charge. c) Convey individual copies of the object code with a copy of the written offer to provide the Corresponding Source. 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However, nothing other than this License grants you permission to propagate or modify any covered work. These actions infringe copyright if you do not accept this License. Therefore, by modifying or propagating a covered work, you indicate your acceptance of this License to do so. 10. Automatic Licensing of Downstream Recipients. Each time you convey a covered work, the recipient automatically receives a license from the original licensors, to run, modify and propagate that work, subject to this License. You are not responsible for enforcing compliance by third parties with this License. An "entity transaction" is a transaction transferring control of an organization, or substantially all assets of one, or subdividing an organization, or merging organizations. If propagation of a covered work results from an entity transaction, each party to that transaction who receives a copy of the work also receives whatever licenses to the work the party's predecessor in interest had or could give under the previous paragraph, plus a right to possession of the Corresponding Source of the work from the predecessor in interest, if the predecessor has it or can get it with reasonable efforts. You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License. For example, you may not impose a license fee, royalty, or other charge for exercise of rights granted under this License, and you may not initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging that any patent claim is infringed by making, using, selling, offering for sale, or importing the Program or any portion of it. 11. Patents. A "contributor" is a copyright holder who authorizes use under this License of the Program or a work on which the Program is based. The work thus licensed is called the contributor's "contributor version". A contributor's "essential patent claims" are all patent claims owned or controlled by the contributor, whether already acquired or hereafter acquired, that would be infringed by some manner, permitted by this License, of making, using, or selling its contributor version, but do not include claims that would be infringed only as a consequence of further modification of the contributor version. For purposes of this definition, "control" includes the right to grant patent sublicenses in a manner consistent with the requirements of this License. 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You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of the parties who would receive the covered work from you, a discriminatory patent license (a) in connection with copies of the covered work conveyed by you (or copies made from those copies), or (b) primarily for and in connection with specific products or compilations that contain the covered work, unless you entered into that arrangement, or that patent license was granted, prior to 28 March 2007. Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law. 12. No Surrender of Others' Freedom. If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program. 13. Remote Network Interaction; Use with the GNU General Public License. Notwithstanding any other provision of this License, if you modify the Program, your modified version must prominently offer all users interacting with it remotely through a computer network (if your version supports such interaction) an opportunity to receive the Corresponding Source of your version by providing access to the Corresponding Source from a network server at no charge, through some standard or customary means of facilitating copying of software. This Corresponding Source shall include the Corresponding Source for any work covered by version 3 of the GNU General Public License that is incorporated pursuant to the following paragraph. Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the work with which it is combined will remain governed by version 3 of the GNU General Public License. 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU Affero General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU Affero General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU Affero General Public License, you may choose any version ever published by the Free Software Foundation. If the Program specifies that a proxy can decide which future versions of the GNU Affero General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program. Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version. 15. Disclaimer of Warranty. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 16. Limitation of Liability. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see . Also add information on how to contact you by electronic and paper mail. If your software can interact with users remotely through a computer network, you should also make sure that it provides a way for users to get its source. For example, if your program is a web application, its interface could display a "Source" link that leads users to an archive of the code. There are many ways you could offer source, and different solutions will be better for different programs; see section 13 for the specific requirements. You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU AGPL, see . 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