Python requests.sessions() Examples

def __init__(self, config):
        from .configuration import Configuration
        if not isinstance(config, Configuration):
            raise ValueError("'config' %r must be a Configuration instance" % config)
        if not config.service_endpoint:
            raise AttributeError("'config.service_endpoint' must be set")
        self.config = config
        self._session_pool_size = self.SESSION_POOLSIZE

        # Autodetect authentication type if necessary
        if self.config.auth_type is None:
            self.config.auth_type = self.get_auth_type()

        # Try to behave nicely with the remote server. We want to keep the connection open between requests.
        # We also want to re-use sessions, to avoid the NTLM auth handshake on every request. We must know the
        # authentication method to create a session pool.
        self._session_pool = self._create_session_pool()
        self._session_pool_lock = Lock() 

def close(self):
        log.debug('Server %s: Closing sessions', self.server)
        while True:
            try:
                self._session_pool.get(block=False).close()
            except Empty:
                break 

def _create_session_pool(self):
        # Create a pool to reuse sessions containing connections to the server
        session_pool = LifoQueue()
        for _ in range(self._session_pool_size):
            session_pool.put(self.create_session(), block=False)
        return session_pool 

def get_session(self):
        _timeout = 60  # Rate-limit messages about session starvation
        while True:
            try:
                log.debug('Server %s: Waiting for session', self.server)
                session = self._session_pool.get(timeout=_timeout)
                log.debug('Server %s: Got session %s', self.server, session.session_id)
                session.usage_count += 1
                return session
            except Empty:
                # This is normal when we have many worker threads starving for available sessions
                log.debug('Server %s: No sessions available for %s seconds', self.server, _timeout) 

def release_session(self, session):
        # This should never fail, as we don't have more sessions than the queue contains
        log.debug('Server %s: Releasing session %s', self.server, session.session_id)
        if self.MAX_SESSION_USAGE_COUNT and session.usage_count > self.MAX_SESSION_USAGE_COUNT:
            log.debug('Server %s: session %s usage exceeded limit. Discarding', self.server, session.session_id)
            session = self.renew_session(session)
        try:
            self._session_pool.put(session, block=False)
        except Full:
            log.debug('Server %s: Session pool was already full %s', self.server, session.session_id) 

def clear_cache(mcs):
        for key, protocol in mcs._protocol_cache.items():
            if isinstance(protocol, Exception):
                continue
            service_endpoint = key[0]
            log.debug("Service endpoint '%s': Closing sessions", service_endpoint)
            protocol.close()
        mcs._protocol_cache.clear() 

def __init__(self):
        self.session = requests.sessions.Session()