Bolt URI in Neo4j 3.1.0 raises "SocketError: Connection refused"

[dhimmel]

While diagnosing another issue, @veleritas and I stumbled upon an odd behavior in py2neo 3.1.2. In this bug report, we'll try to connect to neo4j.het.io (which is currently running Neo4j 3.1.0) using bolt:

import py2neo
assert py2neo.__version__ == '3.1.2'
py2neo.Graph('bolt://neo4j.het.io:7687')

We receive the following error:

Traceback (most recent call last):
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/database/__init__.py", line 318, in __new__
    inst = cls.__instances[key]
KeyError: (<class 'py2neo.database.Graph'>, <ServerAddress settings={'host': 'neo4j.het.io', 'bolt_port': 7687}>, 'data')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 322, in submit
    response = send()
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 317, in send
    http.request(xstr(method), xstr(uri.absolute_path_reference), body, headers)
  File "/Users/dhimmels/anaconda3/lib/python3.4/http/client.py", line 1137, in request
    self._send_request(method, url, body, headers)
  File "/Users/dhimmels/anaconda3/lib/python3.4/http/client.py", line 1182, in _send_request
    self.endheaders(body)
  File "/Users/dhimmels/anaconda3/lib/python3.4/http/client.py", line 1133, in endheaders
    self._send_output(message_body)
  File "/Users/dhimmels/anaconda3/lib/python3.4/http/client.py", line 963, in _send_output
    self.send(msg)
  File "/Users/dhimmels/anaconda3/lib/python3.4/http/client.py", line 898, in send
    self.connect()
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 80, in connect
    self.source_address)
  File "/Users/dhimmels/anaconda3/lib/python3.4/socket.py", line 516, in create_connection
    raise err
  File "/Users/dhimmels/anaconda3/lib/python3.4/socket.py", line 507, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/database/__init__.py", line 327, in __new__
    use_bolt = version_tuple(inst.__remote__.get().content["neo4j_version"]) >= (3,)
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/database/http.py", line 154, in get
    response = self.__base.get(headers=headers, redirect_limit=redirect_limit, **kwargs)
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 966, in get
    return self.__get_or_head("GET", if_modified_since, headers, redirect_limit, **kwargs)
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 943, in __get_or_head
    return rq.submit(redirect_limit=redirect_limit, **kwargs)
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 433, in submit
    http, rs = submit(self.method, uri, self.body, self.headers)
  File "/Users/dhimmels/anaconda3/lib/python3.4/site-packages/py2neo/packages/httpstream/http.py", line 362, in submit
    raise SocketError(code, description, host_port=uri.host_port)
py2neo.packages.httpstream.http.SocketError: Connection refused

However, the following works:

py2neo.Graph('bolt://neo4j.het.io:7687', bolt=True)

So shouldn't bolt=True be inferred given that the URI begins with bolt://?

[veleritas]

Connecting to a localhost neo4j 3.1.1 instance with the uri of py2neo.Graph("bolt://localhost:7678/db/data", bolt=True) doesn't work for me, but it works if I instead do py2neo.Graph("localhost:7678/db/data", bolt=True)

With py2neo 3.1.2, the error I get is:

Traceback (most recent call last):
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/packages/neo4j/v1/session.py", line 124, in session
    session = self.session_pool.pop()
IndexError: pop from an empty deque

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/packages/neo4j/v1/bolt.py", line 419, in connect
    s = create_connection(host_port)
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/socket.py", line 711, in create_connection
    raise err
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/socket.py", line 702, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "neo4j-import.py", line 122, in <module>
    main()
  File "neo4j-import.py", line 116, in main
    hetnet_to_neo4j(path, neo4j_dir, port_0)
  File "neo4j-import.py", line 82, in hetnet_to_neo4j
    hetio.neo4j.export_neo4j(graph, uri, 1000, 250, show_progress=True)
  File "/home/ubuntu/hetio/hetio/neo4j.py", line 41, in export_neo4j
    db_graph.delete_all()
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/database/__init__.py", line 453, in delete_all
    self.run("MATCH (a) DETACH DELETE a")
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/database/__init__.py", line 731, in run
    return self.begin(autocommit=True).run(statement, parameters, **kwparameters)
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/database/__init__.py", line 370, in begin
    return self.transaction_class(self, autocommit)
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/database/__init__.py", line 1249, in __init__
    self.session = driver.session()
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/packages/neo4j/v1/session.py", line 126, in session
    connection = connect(self.address, self.ssl_context, **self.config)
  File "/home/ubuntu/anaconda3/envs/integrate/lib/python3.5/site-packages/py2neo/packages/neo4j/v1/bolt.py", line 422, in connect
    raise ProtocolError("Unable to connect to %s on port %d - is the server running?" % host_port)
py2neo.packages.neo4j.v1.exceptions.ProtocolError: Unable to connect to localhost on port 7678 - is the server running?