class ParallelServer(DisposableObject, BrokerMessageReceiver, ConfigLoader,
HTTPHandler, WMQIPC):
""" Main server process.
"""
def __init__(self):
self.host = None
self.port = None
self.crypto_manager = None
self.odb = None
self.odb_data = None
self.config = None
self.repo_location = None
self.user_conf_location = None
self.sql_pool_store = None
self.soap11_content_type = None
self.soap12_content_type = None
self.plain_xml_content_type = None
self.json_content_type = None
self.internal_service_modules = None # Zato's own internal services
self.service_modules = None # Set programmatically in Spring
self.service_sources = None # Set in a config file
self.base_dir = None
self.tls_dir = None
self.static_dir = None
self.hot_deploy_config = None
self.pickup = None
self.fs_server_config = None
self.fs_sql_config = None
self.pickup_config = None
self.logging_config = None
self.logging_conf_path = None
self.sio_config = None
self.sso_config = None
self.connector_server_grace_time = None
self.id = None
self.name = None
self.worker_id = None
self.worker_pid = None
self.cluster = None
self.cluster_id = None
self.kvdb = None
self.startup_jobs = None
self.worker_store = None
self.request_dispatcher_dispatch = None
self.deployment_lock_expires = None
self.deployment_lock_timeout = None
self.deployment_key = ''
self.app_context = None
self.has_gevent = None
self.delivery_store = None
self.static_config = None
self.component_enabled = Bunch()
self.client_address_headers = [
'HTTP_X_ZATO_FORWARDED_FOR', 'HTTP_X_FORWARDED_FOR', 'REMOTE_ADDR'
]
self.broker_client = None
self.return_tracebacks = None
self.default_error_message = None
self.time_util = None
self.preferred_address = None
self.crypto_use_tls = None
self.servers = None
self.zato_lock_manager = None
self.pid = None
self.sync_internal = None
self.ipc_api = IPCAPI(False)
self.ipc_forwarder = IPCAPI(True)
self.wmq_ipc_tcp_port = None
self.fifo_response_buffer_size = None # Will be in megabytes
self.is_first_worker = None
self.shmem_size = -1.0
self.server_startup_ipc = ServerStartupIPC()
self.keyutils = KeyUtils()
self.sso_api = None
self.is_sso_enabled = False
self.audit_pii = audit_pii
self.startup_callable_tool = None
self.default_internal_pubsub_endpoint_id = None
self._hash_secret_method = None
self._hash_secret_rounds = None
self._hash_secret_salt_size = None
# Allows users store arbitrary data across service invocations
self.user_ctx = Bunch()
self.user_ctx_lock = gevent.lock.RLock()
self.access_logger = logging.getLogger('zato_access_log')
self.access_logger_log = self.access_logger._log
self.needs_access_log = self.access_logger.isEnabledFor(INFO)
self.has_pubsub_audit_log = logging.getLogger(
'zato_pubsub_audit').isEnabledFor('INFO')
self.is_enabled_for_warn = logging.getLogger('zato').isEnabledFor(
'WARN')
# The main config store
self.config = ConfigStore()
gevent.signal(signal.SIGINT, self.destroy)
# ################################################################################################################################
def deploy_missing_services(self, locally_deployed):
""" Deploys services that exist on other servers but not on ours.
"""
# The locally_deployed list are all the services that we could import based on our current
# understanding of the contents of the cluster. However, it's possible that we have
# been shut down for a long time and during that time other servers deployed services
# we don't know anything about. They are not stored locally because we were down.
# Hence we need to check out if there are any other servers in the cluster and if so,
# grab their list of services, compare it with what we have deployed and deploy
# any that are missing.
# Continue only if there is more than one running server in the cluster.
other_servers = self.odb.get_servers()
if other_servers:
other_server = other_servers[
0] # Index 0 is as random as any other because the list is not sorted.
missing = self.odb.get_missing_services(other_server,
locally_deployed)
if missing:
logger.info('Found extra services to deploy: %s',
', '.join(sorted(item.name for item in missing)))
# (file_name, source_path) -> a list of services it contains
modules = {}
# Coalesce all service modules - it is possible that each one has multiple services
# so we do want to deploy the same module over for each service found.
for service_id, name, source_path, source in missing:
file_name = os.path.basename(source_path)
_, tmp_full_path = mkstemp(suffix='-' + file_name)
# Module names are unique so they can serve as keys
key = file_name
if key not in modules:
modules[key] = {
'tmp_full_path': tmp_full_path,
'services': [
name
] # We can append initial name already in this 'if' branch
}
# Save the source code only once here
f = open(tmp_full_path, 'wb')
f.write(source)
f.close()
else:
modules[key]['services'].append(name)
# Create a deployment package in ODB out of which all the services will be picked up ..
for file_name, values in modules.items():
msg = Bunch()
msg.action = HOT_DEPLOY.CREATE_SERVICE.value
msg.msg_type = MESSAGE_TYPE.TO_PARALLEL_ALL
msg.package_id = hot_deploy(self,
file_name,
values['tmp_full_path'],
notify=False)
# .. and tell the worker to actually deploy all the services the package contains.
#gevent.spawn(self.worker_store.on_broker_msg_HOT_DEPLOY_CREATE_SERVICE, msg)
self.worker_store.on_broker_msg_HOT_DEPLOY_CREATE_SERVICE(
msg)
logger.info('Deployed extra services found: %s',
sorted(values['services']))
# ################################################################################################################################
def maybe_on_first_worker(self, server, redis_conn):
""" This method will execute code with a distibuted lock held. We need a lock because we can have multiple worker
processes fighting over the right to redeploy services. The first worker to grab the lock will actually perform
the redeployment and set a flag meaning that for this particular deployment key (and remember that each server restart
means a new deployment key) the services have been already deployed. Further workers will check that the flag exists
and will skip the deployment altogether.
"""
def import_initial_services_jobs(is_first):
# (re-)deploy the services from a clear state
locally_deployed = []
locally_deployed.extend(
self.service_store.import_internal_services(
self.internal_service_modules, self.base_dir,
self.sync_internal, is_first))
locally_deployed.extend(
self.service_store.import_services_from_anywhere(
self.service_modules + self.service_sources,
self.base_dir))
return set(locally_deployed)
lock_name = '{}{}:{}'.format(KVDB.LOCK_SERVER_STARTING,
self.fs_server_config.main.token,
self.deployment_key)
already_deployed_flag = '{}{}:{}'.format(
KVDB.LOCK_SERVER_ALREADY_DEPLOYED,
self.fs_server_config.main.token, self.deployment_key)
logger.debug('Will use the lock_name: `%s`', lock_name)
with self.zato_lock_manager(lock_name,
ttl=self.deployment_lock_expires,
block=self.deployment_lock_timeout):
if redis_conn.get(already_deployed_flag):
# There has been already the first worker who's done everything there is to be done so we may just return.
is_first = False
logger.debug('Not attempting to grab the lock_name:`%s`',
lock_name)
# Simply deploy services, including any missing ones, the first worker has already cleared out the ODB
locally_deployed = import_initial_services_jobs(is_first)
return is_first, locally_deployed
else:
# We are this server's first worker so we need to re-populate
# the database and create the flag indicating we're done.
is_first = True
logger.debug('Got lock_name:`%s`, ttl:`%s`', lock_name,
self.deployment_lock_expires)
# .. Remove all the deployed services from the DB ..
self.odb.drop_deployed_services(server.id)
# .. deploy them back including any missing ones found on other servers.
locally_deployed = import_initial_services_jobs(is_first)
# Add the flag to Redis indicating that this server has already
# deployed its services. Note that by default the expiration
# time is more than a century in the future. It will be cleared out
# next time the server will be started.
redis_conn.set(
already_deployed_flag,
dumps({'create_time_utc': datetime.utcnow().isoformat()}))
redis_conn.expire(already_deployed_flag,
self.deployment_lock_expires)
return is_first, locally_deployed
# ################################################################################################################################
def get_full_name(self):
""" Returns this server's full name in the form of server@cluster.
"""
return '{}@{}'.format(self.name, self.cluster.name)
# ################################################################################################################################
def _after_init_common(self, server):
""" Initializes parts of the server that don't depend on whether the
server's been allowed to join the cluster or not.
"""
# Patterns to match during deployment
self.service_store.patterns_matcher.read_config(
self.fs_server_config.deploy_patterns_allowed)
# Static config files
self.static_config = StaticConfig(
os.path.join(self.repo_location, 'static'))
# Key-value DB
kvdb_config = get_kvdb_config_for_log(self.fs_server_config.kvdb)
kvdb_logger.info('Worker config `%s`', kvdb_config)
self.kvdb.config = self.fs_server_config.kvdb
self.kvdb.server = self
self.kvdb.decrypt_func = self.crypto_manager.decrypt
self.kvdb.init()
kvdb_logger.info('Worker config `%s`', kvdb_config)
# Lua programs, both internal and user defined ones.
for name, program in self.get_lua_programs():
self.kvdb.lua_container.add_lua_program(name, program)
# TimeUtil needs self.kvdb so it can be set now
self.time_util = TimeUtil(self.kvdb)
# Service sources
self.service_sources = []
for name in open(
os.path.join(self.repo_location,
self.fs_server_config.main.service_sources)):
name = name.strip()
if name and not name.startswith('#'):
self.service_sources.append(name)
# User-config from ./config/repo/user-config
for file_name in os.listdir(self.user_conf_location):
conf = get_config(self.user_conf_location, file_name)
# Not used at all in this type of configuration
conf.pop('user_config_items', None)
self.user_config[get_user_config_name(file_name)] = conf
# Convert size of FIFO response buffers to megabytes
self.fifo_response_buffer_size = int(
float(self.fs_server_config.misc.fifo_response_buffer_size) *
megabyte)
is_first, locally_deployed = self.maybe_on_first_worker(
server, self.kvdb.conn)
return is_first, locally_deployed
# ################################################################################################################################
def set_up_odb(self):
# This is the call that creates an SQLAlchemy connection
self.config.odb_data['fs_sql_config'] = self.fs_sql_config
self.sql_pool_store[ZATO_ODB_POOL_NAME] = self.config.odb_data
self.odb.pool = self.sql_pool_store[ZATO_ODB_POOL_NAME].pool
self.odb.token = self.config.odb_data.token
self.odb.decrypt_func = self.decrypt
# ################################################################################################################################
@staticmethod
def start_server(parallel_server, zato_deployment_key=None):
# Easier to type
self = parallel_server
# This cannot be done in __init__ because each sub-process obviously has its own PID
self.pid = os.getpid()
# This also cannot be done in __init__ which doesn't have this variable yet
self.is_first_worker = int(os.environ['ZATO_SERVER_WORKER_IDX']) == 0
# Used later on
use_tls = asbool(self.fs_server_config.crypto.use_tls)
# Will be None if we are not running in background.
if not zato_deployment_key:
zato_deployment_key = '{}.{}'.format(datetime.utcnow().isoformat(),
uuid4().hex)
self.deployment_key = zato_deployment_key
register_diag_handlers()
# Create all POSIX IPC objects now that we have the deployment key
self.shmem_size = int(float(self.fs_server_config.shmem.size) *
10**6) # Convert to megabytes as integer
self.server_startup_ipc.create(self.deployment_key, self.shmem_size)
# Store the ODB configuration, create an ODB connection pool and have self.odb use it
self.config.odb_data = self.get_config_odb_data(self)
self.set_up_odb()
# Now try grabbing the basic server's data from the ODB. No point
# in doing anything else if we can't get past this point.
server = self.odb.fetch_server(self.config.odb_data)
if not server:
raise Exception('Server does not exist in the ODB')
# Set up the server-wide default lock manager
odb_data = self.config.odb_data
backend_type = 'fcntl' if odb_data.engine == 'sqlite' else odb_data.engine
self.zato_lock_manager = LockManager(backend_type, 'zato',
self.odb.session)
# Just to make sure distributed locking is configured correctly
with self.zato_lock_manager(uuid4().hex):
pass
# Basic metadata
self.id = server.id
self.name = server.name
self.cluster_id = server.cluster_id
self.cluster = self.odb.cluster
self.worker_id = '{}.{}.{}.{}'.format(self.cluster_id, self.id,
self.worker_pid, new_cid())
# Looked up upfront here and assigned to services in their store
self.enforce_service_invokes = asbool(
self.fs_server_config.misc.enforce_service_invokes)
# For server-to-server communication
self.servers = Servers(self.odb, self.cluster.name, self.decrypt)
logger.info(
'Preferred address of `%s@%s` (pid: %s) is `http%s://%s:%s`',
self.name, self.cluster.name, self.pid, 's' if use_tls else '',
self.preferred_address, self.port)
# Reads in all configuration from ODB
self.worker_store = WorkerStore(self.config, self)
self.worker_store.invoke_matcher.read_config(
self.fs_server_config.invoke_patterns_allowed)
self.worker_store.target_matcher.read_config(
self.fs_server_config.invoke_target_patterns_allowed)
self.set_up_config(server)
# Deploys services
is_first, locally_deployed = self._after_init_common(server)
# Initializes worker store, including connectors
self.worker_store.init()
self.request_dispatcher_dispatch = self.worker_store.request_dispatcher.dispatch
# Normalize hot-deploy configuration
self.hot_deploy_config = Bunch()
self.hot_deploy_config.work_dir = os.path.normpath(
os.path.join(self.repo_location,
self.fs_server_config.hot_deploy.work_dir))
self.hot_deploy_config.backup_history = int(
self.fs_server_config.hot_deploy.backup_history)
self.hot_deploy_config.backup_format = self.fs_server_config.hot_deploy.backup_format
# Configure remaining parts of SSO
self.configure_sso()
# Cannot be done in __init__ because self.sso_config is not available there yet
salt_size = self.sso_config.hash_secret.salt_size
self.crypto_manager.add_hash_scheme('zato.default',
self.sso_config.hash_secret.rounds,
salt_size)
for name in ('current_work_dir', 'backup_work_dir',
'last_backup_work_dir', 'delete_after_pick_up'):
# New in 2.0
if name == 'delete_after_pick_up':
value = asbool(self.fs_server_config.hot_deploy.get(
name, True))
self.hot_deploy_config[name] = value
else:
self.hot_deploy_config[name] = os.path.normpath(
os.path.join(self.hot_deploy_config.work_dir,
self.fs_server_config.hot_deploy[name]))
broker_callbacks = {
TOPICS[MESSAGE_TYPE.TO_PARALLEL_ANY]:
self.worker_store.on_broker_msg,
TOPICS[MESSAGE_TYPE.TO_PARALLEL_ALL]:
self.worker_store.on_broker_msg,
}
self.broker_client = BrokerClient(self.kvdb, 'parallel',
broker_callbacks,
self.get_lua_programs())
self.worker_store.set_broker_client(self.broker_client)
self._after_init_accepted(locally_deployed)
self.odb.server_up_down(server.token, SERVER_UP_STATUS.RUNNING, True,
self.host, self.port, self.preferred_address,
use_tls)
if is_first:
logger.info('First worker of `%s` is %s', self.name, self.pid)
self.startup_callable_tool.invoke(
SERVER_STARTUP.PHASE.IN_PROCESS_FIRST,
kwargs={
'parallel_server': self,
})
# Startup services
self.invoke_startup_services(is_first)
spawn_greenlet(self.set_up_pickup)
# IPC
ipc_forwarder_name = '{}-{}'.format(self.cluster.name, self.name)
ipc_forwarder_name = fs_safe_name(ipc_forwarder_name)
self.ipc_forwarder.name = ipc_forwarder_name
self.ipc_forwarder.pid = self.pid
spawn_greenlet(self.ipc_forwarder.run)
# Set up IBM MQ connections if that component is enabled
if self.fs_server_config.component_enabled.ibm_mq:
# Will block for a few seconds at most, until is_ok is returned
# which indicates that a connector started or not.
is_ok = self.start_ibm_mq_connector(
int(self.fs_server_config.ibm_mq.ipc_tcp_start_port))
if is_ok:
self.create_initial_wmq_definitions(
self.worker_store.worker_config.definition_wmq)
self.create_initial_wmq_outconns(
self.worker_store.worker_config.out_wmq)
self.create_initial_wmq_channels(
self.worker_store.worker_config.channel_wmq)
else:
self.startup_callable_tool.invoke(
SERVER_STARTUP.PHASE.IN_PROCESS_OTHER,
kwargs={
'parallel_server': self,
})
# IPC
self.ipc_api.name = self.name
self.ipc_api.pid = self.pid
self.ipc_api.on_message_callback = self.worker_store.on_ipc_message
spawn_greenlet(self.ipc_api.run)
self.startup_callable_tool.invoke(SERVER_STARTUP.PHASE.AFTER_STARTED,
kwargs={
'parallel_server': self,
})
logger.info('Started `%s@%s` (pid: %s)', server.name,
server.cluster.name, self.pid)
# ################################################################################################################################
def _get_sso_session(self):
""" Returns a session function suitable for SSO operations.
"""
pool_name = self.sso_config.sql.name
if pool_name:
try:
pool = self.worker_store.sql_pool_store.get(pool_name)
except KeyError:
pool = None
if not pool:
raise Exception(
'SSO pool `{}` not found or inactive'.format(pool_name))
else:
session_func = pool.session
else:
session_func = self.odb.session
return session_func()
# ################################################################################################################################
def configure_sso(self):
if self.is_sso_enabled:
self.sso_api.set_odb_session_func(self._get_sso_session)
# ################################################################################################################################
def invoke_startup_services(self, is_first):
_invoke_startup_services('Parallel',
'startup_services_first_worker' if is_first
else 'startup_services_any_worker',
self.fs_server_config,
self.repo_location,
self.broker_client,
'zato.notif.init-notifiers',
is_sso_enabled=self.is_sso_enabled)
# ################################################################################################################################
def set_up_pickup(self):
empty = []
# Fix up booleans and paths
for stanza, stanza_config in self.pickup_config.items():
# user_config_items is empty by default
if not stanza_config:
empty.append(stanza)
continue
stanza_config.read_on_pickup = asbool(
stanza_config.get('read_on_pickup', True))
stanza_config.parse_on_pickup = asbool(
stanza_config.get('parse_on_pickup', True))
stanza_config.delete_after_pick_up = asbool(
stanza_config.get('delete_after_pick_up', True))
stanza_config.case_insensitive = asbool(
stanza_config.get('case_insensitive', True))
stanza_config.pickup_from = absolutize(stanza_config.pickup_from,
self.base_dir)
stanza_config.is_service_hot_deploy = False
mpt = stanza_config.get('move_processed_to')
stanza_config.move_processed_to = absolutize(
mpt, self.base_dir) if mpt else None
services = stanza_config.get('services') or []
stanza_config.services = [
services
] if not isinstance(services, list) else services
topics = stanza_config.get('topics') or []
stanza_config.topics = [
topics
] if not isinstance(topics, list) else topics
flags = globre.EXACT
if stanza_config.case_insensitive:
flags |= IGNORECASE
patterns = stanza_config.patterns
stanza_config.patterns = [
patterns
] if not isinstance(patterns, list) else patterns
stanza_config.patterns = [
globre.compile(elem, flags) for elem in stanza_config.patterns
]
if not os.path.exists(stanza_config.pickup_from):
logger.warn('Pickup dir `%s` does not exist (%s)',
stanza_config.pickup_from, stanza)
for item in empty:
del self.pickup_config[item]
# Ok, now that we have configured everything that pickup.conf had
# we still need to make it aware of services and how to pick them up from FS.
stanza = 'zato_internal_service_hot_deploy'
stanza_config = Bunch({
'pickup_from':
absolutize(self.fs_server_config.hot_deploy.pickup_dir,
self.repo_location),
'patterns': [globre.compile('*.py', globre.EXACT | IGNORECASE)],
'read_on_pickup':
False,
'parse_on_pickup':
False,
'delete_after_pick_up':
self.hot_deploy_config.delete_after_pick_up,
'is_service_hot_deploy':
True,
})
self.pickup_config[stanza] = stanza_config
self.pickup = PickupManager(self, self.pickup_config)
spawn_greenlet(self.pickup.run)
# ################################################################################################################################
def get_cache(self, cache_type, cache_name):
""" Returns a cache object of given type and name.
"""
return self.worker_store.cache_api.get_cache(cache_type, cache_name)
# ################################################################################################################################
def get_from_cache(self, cache_type, cache_name, key):
""" Returns a value from input cache by key, or None if there is no such key.
"""
return self.worker_store.cache_api.get_cache(cache_type,
cache_name).get(key)
# ################################################################################################################################
def set_in_cache(self, cache_type, cache_name, key, value):
""" Sets a value in cache for input parameters.
"""
return self.worker_store.cache_api.get_cache(cache_type,
cache_name).set(
key, value)
# ################################################################################################################################
def invoke_all_pids(self, service, request, timeout=5, *args, **kwargs):
""" Invokes a given service in each of processes current server has.
"""
# PID -> response from that process
out = {}
# Get all current PIDs
data = self.invoke('zato.info.get-worker-pids',
serialize=False).getvalue(False)
pids = data['response']['pids']
# Underlying IPC needs strings on input instead of None
request = request or ''
for pid in pids:
response = {'is_ok': False, 'pid_data': None, 'error_info': None}
try:
by_pid_response = self.invoke_by_pid(service,
request,
pid,
timeout=timeout,
*args,
**kwargs)
is_ok, pid_data = by_pid_response
response['is_ok'] = is_ok
response['pid_data' if is_ok else 'error_info'] = pid_data
except Exception, e:
response['error_info'] = format_exc(e)
finally:
class ParallelServer(BrokerMessageReceiver, ConfigLoader, HTTPHandler):
""" Main server process.
"""
def __init__(self):
self.host = None
self.port = None
self.crypto_manager = None
self.odb = None
self.odb_data = None
self.config = None
self.repo_location = None
self.user_conf_location = None
self.sql_pool_store = None
self.soap11_content_type = None
self.soap12_content_type = None
self.plain_xml_content_type = None
self.json_content_type = None
self.service_modules = None # Set programmatically in Spring
self.service_sources = None # Set in a config file
self.base_dir = None # type: unicode
self.tls_dir = None # type: unicode
self.static_dir = None # type: unicode
self.json_schema_dir = None # type: unicode
self.hot_deploy_config = None
self.pickup = None
self.fs_server_config = None
self.fs_sql_config = None
self.pickup_config = None
self.logging_config = None
self.logging_conf_path = None
self.sio_config = None
self.sso_config = None
self.connector_server_grace_time = None
self.id = None
self.name = None
self.worker_id = None
self.worker_pid = None
self.cluster = None
self.cluster_id = None
self.kvdb = None
self.startup_jobs = None
self.worker_store = None # type: WorkerStore
self.service_store = None # type: ServiceStore
self.request_dispatcher_dispatch = None
self.deployment_lock_expires = None
self.deployment_lock_timeout = None
self.deployment_key = ''
self.has_gevent = None
self.delivery_store = None
self.static_config = None
self.component_enabled = Bunch()
self.client_address_headers = ['HTTP_X_ZATO_FORWARDED_FOR', 'HTTP_X_FORWARDED_FOR', 'REMOTE_ADDR']
self.broker_client = None
self.return_tracebacks = None
self.default_error_message = None
self.time_util = None
self.preferred_address = None
self.crypto_use_tls = None
self.servers = None
self.zato_lock_manager = None
self.pid = None
self.sync_internal = None
self.ipc_api = IPCAPI()
self.fifo_response_buffer_size = None # Will be in megabytes
self.is_first_worker = None
self.shmem_size = -1.0
self.server_startup_ipc = ServerStartupIPC()
self.connector_config_ipc = ConnectorConfigIPC()
self.keyutils = KeyUtils()
self.sso_api = None
self.is_sso_enabled = False
self.audit_pii = audit_pii
self.has_fg = False
self.startup_callable_tool = None
self.default_internal_pubsub_endpoint_id = None
self._hash_secret_method = None
self._hash_secret_rounds = None
self._hash_secret_salt_size = None
# Our arbiter may potentially call the cleanup procedure multiple times
# and this will be set to True the first time around.
self._is_process_closing = False
# Allows users store arbitrary data across service invocations
self.user_ctx = Bunch()
self.user_ctx_lock = gevent.lock.RLock()
# Connectors
self.connector_ibm_mq = IBMMQIPC(self)
self.connector_sftp = SFTPIPC(self)
# HTTP methods allowed as a Python list
self.http_methods_allowed = []
# As above, but as a regular expression pattern
self.http_methods_allowed_re = ''
self.access_logger = logging.getLogger('zato_access_log')
self.access_logger_log = self.access_logger._log
self.needs_access_log = self.access_logger.isEnabledFor(INFO)
self.has_pubsub_audit_log = logging.getLogger('zato_pubsub_audit').isEnabledFor(INFO)
self.is_enabled_for_warn = logging.getLogger('zato').isEnabledFor(WARN)
# The main config store
self.config = ConfigStore()
# ################################################################################################################################
def deploy_missing_services(self, locally_deployed):
""" Deploys services that exist on other servers but not on ours.
"""
# The locally_deployed list are all the services that we could import based on our current
# understanding of the contents of the cluster. However, it's possible that we have
# been shut down for a long time and during that time other servers deployed services
# we don't know anything about. They are not stored locally because we were down.
# Hence we need to check out if there are any other servers in the cluster and if so,
# grab their list of services, compare it with what we have deployed and deploy
# any that are missing.
# Continue only if there is more than one running server in the cluster.
other_servers = self.odb.get_servers()
if other_servers:
other_server = other_servers[0] # Index 0 is as random as any other because the list is not sorted.
missing = self.odb.get_missing_services(other_server, locally_deployed)
if missing:
logger.info('Found extra services to deploy: %s', ', '.join(sorted(item.name for item in missing)))
# (file_name, source_path) -> a list of services it contains
modules = {}
# Coalesce all service modules - it is possible that each one has multiple services
# so we do want to deploy the same module over for each service found.
for service_id, name, source_path, source in missing:
file_name = os.path.basename(source_path)
_, tmp_full_path = mkstemp(suffix='-'+ file_name)
# Module names are unique so they can serve as keys
key = file_name
if key not in modules:
modules[key] = {
'tmp_full_path': tmp_full_path,
'services': [name] # We can append initial name already in this 'if' branch
}
# Save the source code only once here
f = open(tmp_full_path, 'wb')
f.write(source)
f.close()
else:
modules[key]['services'].append(name)
# Create a deployment package in ODB out of which all the services will be picked up ..
for file_name, values in modules.items():
msg = Bunch()
msg.action = HOT_DEPLOY.CREATE_SERVICE.value
msg.msg_type = MESSAGE_TYPE.TO_PARALLEL_ALL
msg.package_id = hot_deploy(self, file_name, values['tmp_full_path'], notify=False)
# .. and tell the worker to actually deploy all the services the package contains.
#gevent.spawn(self.worker_store.on_broker_msg_HOT_DEPLOY_CREATE_SERVICE, msg)
self.worker_store.on_broker_msg_HOT_DEPLOY_CREATE_SERVICE(msg)
logger.info('Deployed extra services found: %s', sorted(values['services']))
# ################################################################################################################################
def maybe_on_first_worker(self, server, redis_conn):
""" This method will execute code with a distibuted lock held. We need a lock because we can have multiple worker
processes fighting over the right to redeploy services. The first worker to obtain the lock will actually perform
the redeployment and set a flag meaning that for this particular deployment key (and remember that each server restart
means a new deployment key) the services have been already deployed. Further workers will check that the flag exists
and will skip the deployment altogether.
"""
def import_initial_services_jobs(is_first):
# All non-internal services that we have deployed
locally_deployed = []
# Internal modules with that are potentially to be deployed
internal_service_modules = []
# This was added between 3.0 and 3.1, which is why it is optional
deploy_internal = self.fs_server_config.get('deploy_internal', default_internal_modules)
# Above, we potentially got the list of internal modules to be deployed as they were defined in server.conf.
# However, if someone creates an environment and then we add a new module, this module will not neccessarily
# exist in server.conf. This is why we need to add any such missing ones explicitly below.
for internal_module, is_enabled in default_internal_modules.items():
if internal_module not in deploy_internal:
deploy_internal[internal_module] = is_enabled
# All internal modules were found, now we can build a list of what is to be enabled.
for module_name, is_enabled in deploy_internal.items():
if is_enabled:
internal_service_modules.append(module_name)
locally_deployed.extend(self.service_store.import_internal_services(
internal_service_modules, self.base_dir, self.sync_internal, is_first))
logger.info('Deploying user-defined services (%s)', self.name)
user_defined_deployed = self.service_store.import_services_from_anywhere(
self.service_modules + self.service_sources, self.base_dir).to_process
locally_deployed.extend(user_defined_deployed)
len_user_defined_deployed = len(user_defined_deployed)
suffix = ' ' if len_user_defined_deployed == 1 else 's '
logger.info('Deployed %d user-defined service%s (%s)', len_user_defined_deployed, suffix, self.name)
return set(locally_deployed)
lock_name = '{}{}:{}'.format(KVDB.LOCK_SERVER_STARTING, self.fs_server_config.main.token, self.deployment_key)
already_deployed_flag = '{}{}:{}'.format(KVDB.LOCK_SERVER_ALREADY_DEPLOYED,
self.fs_server_config.main.token, self.deployment_key)
logger.debug('Will use the lock_name: `%s`', lock_name)
with self.zato_lock_manager(lock_name, ttl=self.deployment_lock_expires, block=self.deployment_lock_timeout):
if redis_conn.get(already_deployed_flag):
# There has been already the first worker who's done everything there is to be done so we may just return.
is_first = False
logger.debug('Not attempting to obtain the lock_name:`%s`', lock_name)
# Simply deploy services, including any missing ones, the first worker has already cleared out the ODB
locally_deployed = import_initial_services_jobs(is_first)
return is_first, locally_deployed
else:
# We are this server's first worker so we need to re-populate
# the database and create the flag indicating we're done.
is_first = True
logger.debug('Got lock_name:`%s`, ttl:`%s`', lock_name, self.deployment_lock_expires)
# .. Remove all the deployed services from the DB ..
self.odb.drop_deployed_services(server.id)
# .. deploy them back including any missing ones found on other servers.
locally_deployed = import_initial_services_jobs(is_first)
# Add the flag to Redis indicating that this server has already
# deployed its services. Note that by default the expiration
# time is more than a century in the future. It will be cleared out
# next time the server will be started.
redis_conn.set(already_deployed_flag, dumps({'create_time_utc':datetime.utcnow().isoformat()}))
redis_conn.expire(already_deployed_flag, self.deployment_lock_expires)
return is_first, locally_deployed
# ################################################################################################################################
def get_full_name(self):
""" Returns this server's full name in the form of server@cluster.
"""
return '{}@{}'.format(self.name, self.cluster.name)
# ################################################################################################################################
def _after_init_common(self, server):
""" Initializes parts of the server that don't depend on whether the
server's been allowed to join the cluster or not.
"""
# Patterns to match during deployment
self.service_store.patterns_matcher.read_config(self.fs_server_config.deploy_patterns_allowed)
# Static config files
self.static_config = StaticConfig(os.path.join(self.repo_location, 'static'))
# Key-value DB
kvdb_config = get_kvdb_config_for_log(self.fs_server_config.kvdb)
kvdb_logger.info('Worker config `%s`', kvdb_config)
self.kvdb.config = self.fs_server_config.kvdb
self.kvdb.server = self
self.kvdb.decrypt_func = self.crypto_manager.decrypt
self.kvdb.init()
kvdb_logger.info('Worker config `%s`', kvdb_config)
# Lua programs, both internal and user defined ones.
for name, program in self.get_lua_programs():
self.kvdb.lua_container.add_lua_program(name, program)
# TimeUtil needs self.kvdb so it can be set now
self.time_util = TimeUtil(self.kvdb)
# Service sources
self.service_sources = []
for name in open(os.path.join(self.repo_location, self.fs_server_config.main.service_sources)):
name = name.strip()
if name and not name.startswith('#'):
if not os.path.isabs(name):
name = os.path.normpath(os.path.join(self.base_dir, name))
self.service_sources.append(name)
# User-config from ./config/repo/user-config
for file_name in os.listdir(self.user_conf_location):
conf = get_config(self.user_conf_location, file_name)
# Not used at all in this type of configuration
conf.pop('user_config_items', None)
self.user_config[get_user_config_name(file_name)] = conf
# Convert size of FIFO response buffers to megabytes
self.fifo_response_buffer_size = int(float(self.fs_server_config.misc.fifo_response_buffer_size) * megabyte)
is_first, locally_deployed = self.maybe_on_first_worker(server, self.kvdb.conn)
return is_first, locally_deployed
# ################################################################################################################################
def set_up_odb(self):
# This is the call that creates an SQLAlchemy connection
self.config.odb_data['fs_sql_config'] = self.fs_sql_config
self.sql_pool_store[ZATO_ODB_POOL_NAME] = self.config.odb_data
self.odb.pool = self.sql_pool_store[ZATO_ODB_POOL_NAME].pool
self.odb.token = self.config.odb_data.token
self.odb.decrypt_func = self.decrypt
# ################################################################################################################################
@staticmethod
def start_server(parallel_server, zato_deployment_key=None):
# Easier to type
self = parallel_server # type: ParallelServer
# This cannot be done in __init__ because each sub-process obviously has its own PID
self.pid = os.getpid()
# This also cannot be done in __init__ which doesn't have this variable yet
self.is_first_worker = int(os.environ['ZATO_SERVER_WORKER_IDX']) == 0
# Used later on
use_tls = asbool(self.fs_server_config.crypto.use_tls)
# Will be None if we are not running in background.
if not zato_deployment_key:
zato_deployment_key = '{}.{}'.format(datetime.utcnow().isoformat(), uuid4().hex)
self.deployment_key = zato_deployment_key
register_diag_handlers()
# Create all POSIX IPC objects now that we have the deployment key
self.shmem_size = int(float(self.fs_server_config.shmem.size) * 10**6) # Convert to megabytes as integer
self.server_startup_ipc.create(self.deployment_key, self.shmem_size)
self.connector_config_ipc.create(self.deployment_key, self.shmem_size)
# Store the ODB configuration, create an ODB connection pool and have self.odb use it
self.config.odb_data = self.get_config_odb_data(self)
self.set_up_odb()
# Now try grabbing the basic server's data from the ODB. No point
# in doing anything else if we can't get past this point.
server = self.odb.fetch_server(self.config.odb_data)
if not server:
raise Exception('Server does not exist in the ODB')
# Set up the server-wide default lock manager
odb_data = self.config.odb_data
backend_type = 'fcntl' if odb_data.engine == 'sqlite' else odb_data.engine
self.zato_lock_manager = LockManager(backend_type, 'zato', self.odb.session)
# Just to make sure distributed locking is configured correctly
with self.zato_lock_manager(uuid4().hex):
pass
# Basic metadata
self.id = server.id
self.name = server.name
self.cluster_id = server.cluster_id
self.cluster = self.odb.cluster
self.worker_id = '{}.{}.{}.{}'.format(self.cluster_id, self.id, self.worker_pid, new_cid())
# Looked up upfront here and assigned to services in their store
self.enforce_service_invokes = asbool(self.fs_server_config.misc.enforce_service_invokes)
# For server-to-server communication
self.servers = Servers(self.odb, self.cluster.name, self.decrypt)
logger.info('Preferred address of `%s@%s` (pid: %s) is `http%s://%s:%s`', self.name,
self.cluster.name, self.pid, 's' if use_tls else '', self.preferred_address,
self.port)
# Configure which HTTP methods can be invoked via REST or SOAP channels
methods_allowed = self.fs_server_config.http.methods_allowed
methods_allowed = methods_allowed if isinstance(methods_allowed, list) else [methods_allowed]
self.http_methods_allowed.extend(methods_allowed)
# As above, as a regular expression to be used in pattern matching
http_methods_allowed_re = '|'.join(self.http_methods_allowed)
self.http_methods_allowed_re = '({})'.format(http_methods_allowed_re)
# Reads in all configuration from ODB
self.worker_store = WorkerStore(self.config, self)
self.worker_store.invoke_matcher.read_config(self.fs_server_config.invoke_patterns_allowed)
self.worker_store.target_matcher.read_config(self.fs_server_config.invoke_target_patterns_allowed)
self.set_up_config(server)
# Normalize hot-deploy configuration
self.hot_deploy_config = Bunch()
self.hot_deploy_config.pickup_dir = absolutize(self.fs_server_config.hot_deploy.pickup_dir, self.repo_location)
self.hot_deploy_config.work_dir = os.path.normpath(os.path.join(
self.repo_location, self.fs_server_config.hot_deploy.work_dir))
self.hot_deploy_config.backup_history = int(self.fs_server_config.hot_deploy.backup_history)
self.hot_deploy_config.backup_format = self.fs_server_config.hot_deploy.backup_format
# Added in 3.1, hence optional
max_batch_size = int(self.fs_server_config.hot_deploy.get('max_batch_size', 1000))
# Turn it into megabytes
max_batch_size = max_batch_size * 1000
# Finally, assign it to ServiceStore
self.service_store.max_batch_size = max_batch_size
# Deploys services
is_first, locally_deployed = self._after_init_common(server)
# Initializes worker store, including connectors
self.worker_store.init()
self.request_dispatcher_dispatch = self.worker_store.request_dispatcher.dispatch
# Configure remaining parts of SSO
self.configure_sso()
# Cannot be done in __init__ because self.sso_config is not available there yet
salt_size = self.sso_config.hash_secret.salt_size
self.crypto_manager.add_hash_scheme('zato.default', self.sso_config.hash_secret.rounds, salt_size)
for name in('current_work_dir', 'backup_work_dir', 'last_backup_work_dir', 'delete_after_pickup'):
# New in 2.0
if name == 'delete_after_pickup':
# For backward compatibility, we need to support both names
old_name = 'delete_after_pick_up'
if old_name in self.fs_server_config.hot_deploy:
_name = old_name
else:
_name = name
value = asbool(self.fs_server_config.hot_deploy.get(_name, True))
self.hot_deploy_config[name] = value
else:
self.hot_deploy_config[name] = os.path.normpath(os.path.join(
self.hot_deploy_config.work_dir, self.fs_server_config.hot_deploy[name]))
broker_callbacks = {
TOPICS[MESSAGE_TYPE.TO_PARALLEL_ANY]: self.worker_store.on_broker_msg,
TOPICS[MESSAGE_TYPE.TO_PARALLEL_ALL]: self.worker_store.on_broker_msg,
}
self.broker_client = BrokerClient(self.kvdb, 'parallel', broker_callbacks, self.get_lua_programs())
self.worker_store.set_broker_client(self.broker_client)
# Make sure that broker client's connection is ready before continuing
# to rule out edge cases where, for instance, hot deployment would
# try to publish a locally found package (one of extra packages found)
# before the client's thread connected to KVDB.
if not self.broker_client.ready:
start = now = datetime.utcnow()
max_seconds = 120
until = now + timedelta(seconds=max_seconds)
while not self.broker_client.ready:
now = datetime.utcnow()
delta = (now - start).total_seconds()
if now < until:
# Do not log too early so as not to clutter logs
if delta > 2:
logger.info('Waiting for broker client to become ready (%s, max:%s)', delta, max_seconds)
gevent.sleep(0.5)
else:
raise Exception('Broker client did not become ready within {} seconds'.format(max_seconds))
self._after_init_accepted(locally_deployed)
self.odb.server_up_down(
server.token, SERVER_UP_STATUS.RUNNING, True, self.host, self.port, self.preferred_address, use_tls)
if is_first:
logger.info('First worker of `%s` is %s', self.name, self.pid)
self.startup_callable_tool.invoke(SERVER_STARTUP.PHASE.IN_PROCESS_FIRST, kwargs={
'parallel_server': self,
})
# Clean up any old WSX connections possibly registered for this server
# which may be still linger around, for instance, if the server was previously
# shut down forcibly and did not have an opportunity to run self.cleanup_on_stop
self.cleanup_wsx()
# Startup services
self.invoke_startup_services(is_first)
spawn_greenlet(self.set_up_pickup)
# Set up subprocess-based IBM MQ connections if that component is enabled
if self.fs_server_config.component_enabled.ibm_mq:
# Will block for a few seconds at most, until is_ok is returned
# which indicates that a connector started or not.
is_ok = self.connector_ibm_mq.start_ibm_mq_connector(int(self.fs_server_config.ibm_mq.ipc_tcp_start_port))
try:
if is_ok:
self.connector_ibm_mq.create_initial_wmq_definitions(self.worker_store.worker_config.definition_wmq)
self.connector_ibm_mq.create_initial_wmq_outconns(self.worker_store.worker_config.out_wmq)
self.connector_ibm_mq.create_initial_wmq_channels(self.worker_store.worker_config.channel_wmq)
except Exception as e:
logger.warn('Could not create initial IBM MQ objects, e:`%s`', e)
# Set up subprocess-based SFTP connections
is_ok = self.connector_sftp.start_sftp_connector(int(self.fs_server_config.ibm_mq.ipc_tcp_start_port))
if is_ok:
self.connector_sftp.create_initial_sftp_outconns(self.worker_store.worker_config.out_sftp)
else:
self.startup_callable_tool.invoke(SERVER_STARTUP.PHASE.IN_PROCESS_OTHER, kwargs={
'parallel_server': self,
})
# IPC
self.ipc_api.name = self.ipc_api.get_endpoint_name(self.cluster.name, self.name, self.pid)
self.ipc_api.pid = self.pid
self.ipc_api.on_message_callback = self.worker_store.on_ipc_message
spawn_greenlet(self.ipc_api.run)
self.startup_callable_tool.invoke(SERVER_STARTUP.PHASE.AFTER_STARTED, kwargs={
'parallel_server': self,
})
logger.info('Started `%s@%s` (pid: %s)', server.name, server.cluster.name, self.pid)
# ################################################################################################################################
def _get_sso_session(self):
""" Returns a session function suitable for SSO operations.
"""
pool_name = self.sso_config.sql.name
if pool_name:
try:
pool = self.worker_store.sql_pool_store.get(pool_name)
except KeyError:
pool = None
if not pool:
raise Exception('SSO pool `{}` not found or inactive'.format(pool_name))
else:
session_func = pool.session
else:
session_func = self.odb.session
return session_func()
# ################################################################################################################################
def configure_sso(self):
if self.is_sso_enabled:
self.sso_api.set_odb_session_func(self._get_sso_session)
# ################################################################################################################################
def invoke_startup_services(self, is_first):
_invoke_startup_services('Parallel', 'startup_services_first_worker' if is_first else 'startup_services_any_worker',
self.fs_server_config, self.repo_location, self.broker_client, None,
is_sso_enabled=self.is_sso_enabled)
# ################################################################################################################################
def set_up_pickup(self):
empty = []
# Fix up booleans and paths
for stanza, stanza_config in self.pickup_config.items():
# user_config_items is empty by default
if not stanza_config:
empty.append(stanza)
continue
stanza_config.read_on_pickup = asbool(stanza_config.get('read_on_pickup', True))
stanza_config.parse_on_pickup = asbool(stanza_config.get('parse_on_pickup', True))
stanza_config.delete_after_pickup = asbool(stanza_config.get('delete_after_pickup', True))
stanza_config.case_insensitive = asbool(stanza_config.get('case_insensitive', True))
stanza_config.pickup_from = absolutize(stanza_config.pickup_from, self.base_dir)
stanza_config.is_service_hot_deploy = False
mpt = stanza_config.get('move_processed_to')
stanza_config.move_processed_to = absolutize(mpt, self.base_dir) if mpt else None
services = stanza_config.get('services') or []
stanza_config.services = [services] if not isinstance(services, list) else services
topics = stanza_config.get('topics') or []
stanza_config.topics = [topics] if not isinstance(topics, list) else topics
flags = globre.EXACT
if stanza_config.case_insensitive:
flags |= IGNORECASE
patterns = stanza_config.patterns
stanza_config.patterns = [patterns] if not isinstance(patterns, list) else patterns
stanza_config.patterns = [globre.compile(elem, flags) for elem in stanza_config.patterns]
if not os.path.exists(stanza_config.pickup_from):
logger.warn('Pickup dir `%s` does not exist (%s)', stanza_config.pickup_from, stanza)
for item in empty:
del self.pickup_config[item]
# Ok, now that we have configured everything that pickup.conf had
# we still need to make it aware of services and how to pick them up from FS.
stanza = 'zato_internal_service_hot_deploy'
stanza_config = Bunch({
'pickup_from': self.hot_deploy_config.pickup_dir,
'patterns': [globre.compile('*.py', globre.EXACT | IGNORECASE)],
'read_on_pickup': False,
'parse_on_pickup': False,
'delete_after_pickup': self.hot_deploy_config.delete_after_pickup,
'is_service_hot_deploy': True,
})
self.pickup_config[stanza] = stanza_config
self.pickup = PickupManager(self, self.pickup_config)
spawn_greenlet(self.pickup.run)
# ################################################################################################################################
def get_cache(self, cache_type, cache_name):
""" Returns a cache object of given type and name.
"""
return self.worker_store.cache_api.get_cache(cache_type, cache_name)
# ################################################################################################################################
def get_from_cache(self, cache_type, cache_name, key):
""" Returns a value from input cache by key, or None if there is no such key.
"""
return self.worker_store.cache_api.get_cache(cache_type, cache_name).get(key)
# ################################################################################################################################
def set_in_cache(self, cache_type, cache_name, key, value):
""" Sets a value in cache for input parameters.
"""
return self.worker_store.cache_api.get_cache(cache_type, cache_name).set(key, value)
# ################################################################################################################################
def invoke_all_pids(self, service, request, timeout=5, *args, **kwargs):
""" Invokes a given service in each of processes current server has.
"""
try:
# PID -> response from that process
out = {}
# Get all current PIDs
data = self.invoke('zato.info.get-worker-pids', serialize=False).getvalue(False)
pids = data['response']['pids']
# Underlying IPC needs strings on input instead of None
request = request or ''
for pid in pids:
response = {
'is_ok': False,
'pid_data': None,
'error_info': None
}
try:
is_ok, pid_data = self.invoke_by_pid(service, request, pid, timeout=timeout, *args, **kwargs)
response['is_ok'] = is_ok
response['pid_data' if is_ok else 'error_info'] = pid_data
except Exception:
e = format_exc()
response['error_info'] = e
finally:
out[pid] = response
except Exception:
logger.warn('PID invocation error `%s`', format_exc())
finally:
return out
# ################################################################################################################################
def invoke_by_pid(self, service, request, target_pid, *args, **kwargs):
""" Invokes a service in a worker process by the latter's PID.
"""
return self.ipc_api.invoke_by_pid(service, request, self.cluster.name, self.name, target_pid,
self.fifo_response_buffer_size, *args, **kwargs)
# ################################################################################################################################
def invoke(self, service, request=None, *args, **kwargs):
""" Invokes a service either in our own worker or, if PID is given on input, in another process of this server.
"""
target_pid = kwargs.pop('pid', None)
if target_pid and target_pid != self.pid:
# This cannot be used by self.invoke_by_pid
data_format = kwargs.pop('data_format', None)
_, data = self.invoke_by_pid(service, request, target_pid, *args, **kwargs)
return dumps(data) if data_format == DATA_FORMAT.JSON else data
else:
return self.worker_store.invoke(
service, request,
data_format=kwargs.pop('data_format', DATA_FORMAT.DICT),
serialize=kwargs.pop('serialize', True),
*args, **kwargs)
# ################################################################################################################################
def invoke_async(self, service, request, callback, *args, **kwargs):
""" Invokes a service in background.
"""
return self.worker_store.invoke(service, request, is_async=True, callback=callback, *args, **kwargs)
# ################################################################################################################################
def publish_pickup(self, topic_name, request, *args, **kwargs):
""" Publishes a pickedup file to a named topic.
"""
self.invoke('zato.pubsub.publish.publish', {
'topic_name': topic_name,
'endpoint_id': self.default_internal_pubsub_endpoint_id,
'has_gd': False,
'data': dumps({
'meta': {
'pickup_ts_utc': request['ts_utc'],
'stanza': request['stanza'],
'full_path': request['full_path'],
'file_name': request['file_name'],
},
'data': {
'raw': request['raw_data'],
}
})
})
# ################################################################################################################################
def deliver_pubsub_msg(self, msg):
""" A callback method invoked by pub/sub delivery tasks for each messages that is to be delivered.
"""
subscription = self.worker_store.pubsub.subscriptions_by_sub_key[msg.sub_key]
topic = self.worker_store.pubsub.topics[subscription.config.topic_id]
if topic.before_delivery_hook_service_invoker:
response = topic.before_delivery_hook_service_invoker(topic, msg)
if response['skip_msg']:
raise SkipDelivery(msg.pub_msg_id)
self.invoke('zato.pubsub.delivery.deliver-message', {'msg':msg, 'subscription':subscription})
# ################################################################################################################################
def encrypt(self, data, _prefix=SECRETS.PREFIX):
""" Returns data encrypted using server's CryptoManager.
"""
data = data.encode('utf8')
encrypted = self.crypto_manager.encrypt(data)
encrypted = encrypted.decode('utf8')
return '{}{}'.format(_prefix, encrypted)
# ################################################################################################################################
def hash_secret(self, data, name='zato.default'):
return self.crypto_manager.hash_secret(data, name)
# ################################################################################################################################
def verify_hash(self, given, expected, name='zato.default'):
return self.crypto_manager.verify_hash(given, expected, name)
# ################################################################################################################################
def decrypt(self, encrypted, _prefix=SECRETS.PREFIX):
""" Returns data decrypted using server's CryptoManager.
"""
return self.crypto_manager.decrypt(encrypted.replace(_prefix, '', 1))
# ################################################################################################################################
@staticmethod
def post_fork(arbiter, worker):
""" A Gunicorn hook which initializes the worker.
"""
# Each subprocess needs to have the random number generator re-seeded.
numpy_seed()
worker.app.zato_wsgi_app.startup_callable_tool.invoke(SERVER_STARTUP.PHASE.BEFORE_POST_FORK, kwargs={
'arbiter': arbiter,
'worker': worker,
})
worker.app.zato_wsgi_app.worker_pid = worker.pid
ParallelServer.start_server(worker.app.zato_wsgi_app, arbiter.zato_deployment_key)
# ################################################################################################################################
@staticmethod
def on_starting(arbiter):
""" A Gunicorn hook for setting the deployment key for this particular
set of server processes. It needs to be added to the arbiter because
we want for each worker to be (re-)started to see the same key.
"""
setattr(arbiter, 'zato_deployment_key', '{}.{}'.format(datetime.utcnow().isoformat(), uuid4().hex))
# ################################################################################################################################
@staticmethod
def worker_exit(arbiter, worker):
# Invoke cleanup procedures
worker.app.zato_wsgi_app.cleanup_on_stop()
# ################################################################################################################################
def cleanup_wsx(self, needs_pid=False):
""" Delete persistent information about WSX clients currently registered with the server.
"""
wsx_service = 'zato.channel.web-socket.client.delete-by-server'
if self.service_store.is_deployed(wsx_service):
self.invoke(wsx_service, {'needs_pid': needs_pid})
# ################################################################################################################################
@staticmethod
def cleanup_worker(worker):
worker.app.cleanup_on_stop()
def cleanup_on_stop(self):
""" A shutdown cleanup procedure.
"""
# Tell the ODB we've gone through a clean shutdown but only if this is
# the main process going down (Arbiter) not one of Gunicorn workers.
# We know it's the main process because its ODB's session has never
# been initialized.
if not self.odb.session_initialized:
self.config.odb_data = self.get_config_odb_data(self)
self.config.odb_data['fs_sql_config'] = self.fs_sql_config
self.set_up_odb()
self.odb.init_session(ZATO_ODB_POOL_NAME, self.config.odb_data, self.odb.pool, False)
self.odb.server_up_down(self.odb.token, SERVER_UP_STATUS.CLEAN_DOWN)
self.odb.close()
# Per-worker cleanup
else:
# Set the flag to True only the first time we are called, otherwise simply return
if self._is_process_closing:
return
else:
self._is_process_closing = True
# Close SQL pools
self.sql_pool_store.cleanup_on_stop()
# Close all POSIX IPC structures
self.server_startup_ipc.close()
self.connector_config_ipc.close()
# Close ZeroMQ-based IPC
self.ipc_api.close()
# WSX connections for this server cleanup
self.cleanup_wsx(True)
logger.info('Stopping server process (%s:%s) (%s)', self.name, self.pid, os.getpid())
# ################################################################################################################################
def notify_new_package(self, package_id):
""" Publishes a message on the broker so all the servers (this one including
can deploy a new package).
"""
msg = {'action': HOT_DEPLOY.CREATE_SERVICE.value, 'package_id': package_id}
self.broker_client.publish(msg)