DCPError: no transports defined

[philippedistributive]

Issue type

Bug

How did you install PythonMonkey?

None

OS platform and distribution

No response

Python version (python --version)

No response

PythonMonkey version (pip show pythonmonkey)

No response

Bug Description

sometimes get

Warning: keepalive failed for compute groups service DCPError: no transports defined
DCPError@webpack://dcp/./src/common/dcp-error.js?:22:5Connection530$$connectTransport@webpack://dcp/./src/protocol/connection.js?:825:22
asyncConnection530$$connectInternal@webpack://dcp/./src/protocol/connection.js?:757:16
asyncConnection530$$connect@webpack://dcp/./src/protocol/connection.js?:667:10
Connection530$$send@webpack://dcp/./src/protocol/connection.js?:1170:15
DcpMessage$$send@webpack://dcp/./src/protocol/dcp-message.js?:58:26
Connection530$$keepalive@webpack://dcp/./src/protocol/connection.js?:1225:18
keepAlive@webpack://dcp/./src/dcp-client/compute-groups/index.js?:65:36
addJobToGroups@webpack://dcp/./src/dcp-client/compute-groups/index.js?:458:17
joinComputeGroups@webpack://dcp/./src/dcp-client/job/index.js?:1304:47
exec@webpack://dcp/./src/dcp-client/job/index.js?:999:43
sendPromiseRejectWrapper@webpack://dcp/./src/protocol/connection.js?:1135:32
DialogueRegistry$$clear@webpack://dcp/./src/protocol/dialogue-registry.js?:173:24
finalize@webpack://dcp/./src/protocol/connection.js?:491:29
Connection530$$shutdown/<@webpack://dcp/./src/protocol/connection.js?:460:9
Connection530$$a$enqueue@webpack://dcp/./src/protocol/connection.js?:1118:27
Connection530$$send@webpack://dcp/./src/protocol/connection.js?:1182:36
DcpMessage$$send@webpack://dcp/./src/protocol/dcp-message.js?:58:26
Connection530$$keepalive@webpack://dcp/./src/protocol/connection.js?:1225:18
keepAlive@webpack://dcp/./src/dcp-client/compute-groups/index.js?:65:36
addJobToGroups@webpack://dcp/./src/dcp-client/compute-groups/index.js?:458:17
joinComputeGroups@webpack://dcp/./src/dcp-client/job/index.js?:1304:47
exec@webpack://dcp/./src/dcp-client/job/index.js?:999:43
code: 'DCPC-1014', message: 'no transports defined'

Standalone code to reproduce the issue

No response

Relevant log output or backtrace

No response

Additional info if applicable

No response

What branch of PythonMonkey were you developing on? (If applicable)

No response

[wesgarland]

FYI - this probably means that XHR threw an exception, so DCP wanted to move to a non-socketio transport, but we only have one transport implemented right now. We consider uncategorized exceptions like this to be fatal errors for a given connection.

[philippedistributive]

just reproed by Caleb

[wiwichips]

I'm hitting this as well - with stack:

Uncaught undefined DCPError: no transports defined
    DCPError@webpack://dcp/./src/common/dcp-error.js?:22:5Connection530$$connectTransport@webpack://dcp/./src/protocol/connection.js?:828:22
    async*Connection530$$connectInternal@webpack://dcp/./src/protocol/connection.js?:760:16
    async*Connection530$$connect@webpack://dcp/./src/protocol/connection.js?:674:10
    Connection530$$send@webpack://dcp/./src/protocol/connection.js?:1189:15
    Connection530$$request@webpack://dcp/./src/protocol/connection.js?:1233:15
    provisionSubscriptionTokens@webpack://dcp/./src/events/event-subscriber.js?:227:48
    subscribeManyEvents@webpack://dcp/./src/events/event-subscriber.js?:307:18
    subscribeCustomEvents@webpack://dcp/./src/dcp-client/job/index.js?:1228:34
    addInitialEvents@webpack://dcp/./src/dcp-client/job/index.js?:1189:18
    async*exec@webpack://dcp/./src/dcp-client/job/index.js?:954:39

  timestamp: 2024-07-01T21:45:41.886Z,
  code: 'DCPC-1014',
  process: 'z-pure-pm-joe' undefined
Uncaught undefined DCPError: no transports defined
    DCPError@webpack://dcp/./src/common/dcp-error.js?:22:5Connection530$$connectTransport@webpack://dcp/./src/protocol/connection.js?:828:22
    async*Connection530$$connectInternal@webpack://dcp/./src/protocol/connection.js?:760:16
    async*Connection530$$connect@webpack://dcp/./src/protocol/connection.js?:674:10
    Connection530$$send@webpack://dcp/./src/protocol/connection.js?:1189:15
    Connection530$$request@webpack://dcp/./src/protocol/connection.js?:1233:15
    provisionSubscriptionTokens@webpack://dcp/./src/events/event-subscriber.js?:227:48
    subscribeManyEvents@webpack://dcp/./src/events/event-subscriber.js?:307:18
    subscribeCustomEvents@webpack://dcp/./src/dcp-client/job/index.js?:1228:34
    addInitialEvents@webpack://dcp/./src/dcp-client/job/index.js?:1189:18
    async*exec@webpack://dcp/./src/dcp-client/job/index.js?:954:39

  timestamp: 2024-07-01T21:45:49.390Z,
  code: 'DCPC-1014',
  process: 'z-pure-pm-joe' undefined

undefined Error: xhr poll error
    TransportError@webpack://dcp/./node_modules/@kingsds/engine.io-client/build/cjs/transport.js?:14:9
    onError@webpack://dcp/./node_modules/@kingsds/engine.io-client/build/cjs/transport.js?:46:37
    doPoll/<@webpack://dcp/./node_modules/@kingsds/engine.io-client/build/cjs/transports/polling.js?:255:18
    Emitter.prototype.emit@webpack://dcp/./node_modules/@socket.io/component-emitter/index.mjs?:140:20
    onError@webpack://dcp/./node_modules/@kingsds/engine.io-client/build/cjs/transports/polling.js?:356:14
    create/xhr.onreadystatechange/<@webpack://dcp/./node_modules/@kingsds/engine.io-client/build/cjs/transports/polling.js?:329:30

  description: 0,
  context: 
   XMLHttpRequest {
     onloadstart: undefined,
     onprogress: undefined,
     onabort: undefined,
     onerror: undefined,
     onload: undefined,
     ontimeout: undefined,
     onloadend: undefined,
     onreadystatechange: [Function],
     UNSENT: 0,
     OPENED: 1,
     HEADERS_RECEIVED: 2,
     LOADING: 3,
     DONE: 4,
     timeout: 0 },
  type: 'TransportError',
  transport: 'socketio',
  httpStatus: 0,
  httpHeaders: {},
  __statusTextCode: undefined undefined

from the following repro:

#!/usr/bin/env python3
import pythonmonkey as pm
import asyncio

#relative path - but fwiw, I'm on develop dcp-client & dcp as of 2024-07-01
dcpClient = pm.require('./dcp/js/node_modules/dcp-client')
dcpClient['init']()

async def compute_for_it():
    pm.eval('''
    globalThis.myJob = dcp.compute.for([1,2,3,4,5,6,7,8,9,10], (x) => { progress(); return x + x })
    ''')
asyncio.run(compute_for_it())

my_j = pm.eval("globalThis.myJob")

my_j.on('readystatechange', print)
my_j.on('accepted', lambda: print(my_j.id))
my_j.on('result', print)

my_j.public.name = 'simple example'

async def exec_it():
    return await my_j.exec()
res = asyncio.run(exec_it())

print(pm.eval('Array.from')(res))

[wiwichips]

Still getting this issue

[wiwichips]

See private KDS Slack thread about my reporting of this bug and it being frequent.

[philippedistributive]

I just saw a new manifestation of this error while running in a public library, with a high-repro rate:

Uncaught undefined DCPError: no transports defined
DCPError@webpack://dcp/./src/common/dcp-error.js?:22:5Connection530$$connectTransport@webpack://dcp/./src/protocol/connection.js?:828:22
asyncConnection530$$connectInternal@webpack://dcp/./src/protocol/connection.js?:760:16
asyncConnection530$$connect@webpack://dcp/./src/protocol/connection.js?:674:10
Connection530$$send@webpack://dcp/./src/protocol/connection.js?:1189:15
Connection530$$request@webpack://dcp/./src/protocol/connection.js?:1233:15
provisionSubscriptionTokens@webpack://dcp/./src/events/event-subscriber.js?:227:48
subscribeManyEvents@webpack://dcp/./src/events/event-subscriber.js?:307:18
subscribeNewEvents@webpack://dcp/./src/dcp-client/job/index.js?:1219:32
addInitialEvents@webpack://dcp/./src/dcp-client/job/index.js?:1172:16
async*exec@webpack://dcp/./src/dcp-client/job/index.js?:954:39