Pyscript ftplib Websocket issues in py-env

Technical Topics PyScript
1

Hello Guys,
Just a heads up akismet for some reason flagged my last post as spam. However I found out the problem. I’m having another issue though.

image
image1202×940 97 KB

I’m getting this error

close @ pyodide.asm.js:14
close @ pyodide.asm.js:14
close @ pyodide.asm.js:14
_fd_close @ pyodide.asm.js:14
$close @ pyodide.asm.wasm:0x5810f8
$func5042 @ pyodide.asm.wasm:0x2a989e
method_call_trampoline @ pyodide.asm.js:14
$func1175 @ pyodide.asm.wasm:0x13d44b
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9d9
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ffa4e
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$_PyObject_FastCallDictTstate @ pyodide.asm.wasm:0x134d17
$_PyObject_Call_Prepend @ pyodide.asm.wasm:0x13552f
$func2435 @ pyodide.asm.wasm:0x1932a4
$func2336 @ pyodide.asm.wasm:0x18ad4c
method_call_trampoline @ pyodide.asm.js:14
$_PyObject_MakeTpCall @ pyodide.asm.wasm:0x134c2c
$func3167 @ pyodide.asm.wasm:0x201efe
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9d9
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$PyEval_EvalCode @ pyodide.asm.wasm:0x1f97a0
$func3089 @ pyodide.asm.wasm:0x1f6ad9
$func1957 @ pyodide.asm.wasm:0x174d8f
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff173
$func1364 @ pyodide.asm.wasm:0x1487f2
$func1385 @ pyodide.asm.wasm:0x14968c
$PyIter_Send @ pyodide.asm.wasm:0x121bcf
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1fc373
$func1364 @ pyodide.asm.wasm:0x1487f2
$func1356 @ pyodide.asm.wasm:0x147ef7
$func1386 @ pyodide.asm.wasm:0x14969a
method_call_trampoline @ pyodide.asm.js:14
$func1176 @ pyodide.asm.wasm:0x13d52c
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func1080 @ pyodide.asm.wasm:0x136cde
$func3330 @ pyodide.asm.wasm:0x217a98
$func1954 @ pyodide.asm.wasm:0x174a14
$PyVectorcall_Call @ pyodide.asm.wasm:0x135149
$_PyObject_Call @ pyodide.asm.wasm:0x135243
$PyObject_Call @ pyodide.asm.wasm:0x1352e6
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1fff83
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$_pyproxy_apply @ pyodide.asm.wasm:0xf16d8
Module.callPyObjectKwargs @ pyproxy.gen.ts:360
Module.callPyObject @ pyproxy.gen.ts:384
wrapper @ pyodide.asm.js:14
setTimeout (async)
hiwire_call_bound @ pyodide.asm.js:14
$func380 @ pyodide.asm.wasm:0xef536
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff173
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func1080 @ pyodide.asm.wasm:0x136c6e
$PyVectorcall_Call @ pyodide.asm.wasm:0x135186
$_PyObject_Call @ pyodide.asm.wasm:0x135243
$PyObject_Call @ pyodide.asm.wasm:0x1352e6
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1fff83
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func1080 @ pyodide.asm.wasm:0x136c6e
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ffa4e
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$_PyObject_FastCallDictTstate @ pyodide.asm.wasm:0x134d4d
$_PyObject_Call_Prepend @ pyodide.asm.wasm:0x13552f
$func2435 @ pyodide.asm.wasm:0x1932a4
$func2336 @ pyodide.asm.wasm:0x18ad4c
method_call_trampoline @ pyodide.asm.js:14
$_PyObject_MakeTpCall @ pyodide.asm.wasm:0x134c2c
$func3167 @ pyodide.asm.wasm:0x201efe
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ffa4e
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ff9ff
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$func3167 @ pyodide.asm.wasm:0x201f1b
$_PyEval_EvalFrameDefault @ pyodide.asm.wasm:0x1ffa4e
$_PyEval_Vector @ pyodide.asm.wasm:0x1f98b5
$_PyFunction_Vectorcall @ pyodide.asm.wasm:0x135329
$PyObject_VectorcallMethod @ pyodide.asm.wasm:0x135c47
$_pyproxy_ensure_future @ pyodide.asm.wasm:0xf1aa9
_ensure_future @ pyproxy.gen.ts:1053
Module.callPyObjectKwargs @ pyproxy.gen.ts:379
Module.callPyObject @ pyproxy.gen.ts:384
apply @ pyproxy.gen.ts:1145
apply @ pyproxy.gen.ts:1022
(anonymous) @ api.ts:181
(anonymous) @ tslib.es6.js:76
__awaiter @ tslib.es6.js:72
runPythonAsync @ api.ts:167
evaluate @ base.ts:90
pyodide.asm.js:14 Element.write: PythonError: Traceback (most recent call last):
  File "/lib/python3.10/asyncio/futures.py", line 201, in result
    raise self._exception
  File "/lib/python3.10/asyncio/tasks.py", line 232, in __step
    result = coro.send(None)
  File "/lib/python3.10/site-packages/_pyodide/_base.py", line 500, in eval_code_async
    await CodeRunner(
  File "/lib/python3.10/site-packages/_pyodide/_base.py", line 351, in run_async
    coroutine = eval(self.code, globals, locals)
  File "<exec>", line 12, in <module>
  File "/lib/python3.10/ftplib.py", line 121, in __init__
    self.connect(host)
  File "/lib/python3.10/ftplib.py", line 158, in connect
    self.sock = socket.create_connection((self.host, self.port), self.timeout,
  File "/lib/python3.10/socket.py", line 845, in create_connection
    raise err
  File "/lib/python3.10/socket.py", line 833, in create_connection
    sock.connect(sa)
BlockingIOError: [Errno 26] Operation in progress
 --> True

my code is on my github if i’m allowed to post it without being flagged by akismet.

2

It looks like the code you’re using (ftplib in some way, yes?) makes uses of Python’ssocket package?That’s what’s I’d assume from the line File "/lib/python3.10/socket.py", line 833, in create_connection sock.connect(sa).

Unfortunately, native sockets (as in the sockets package) don’t work in PyScript/Pyodide - they rely on low-level networking features that are available in the typical environments CPython runs in, but not within the sandbox of a browser window.

There is the WebSockets API, but it’s not a 1:1 drop in for sockets, and would need quite a bit of integration to use underneath something like ftp.

3

Hey Jeff,
No the line of code is here

import pandas as pd 
import ftplib
from pyodide import create_proxy, to_js
from js import chartasm
from pyodide import create_proxy



ftp_server = ftplib.FTP(HOSTNAME, USERNAME, PASSWORD)

ftp_server.encoding = "utf-8"

filename = "public_html//reports//abba//data//ReportGraphC.csv"

file = "ReportGraphC.csv"

    # Command for Downloading the file "RETR filename"
ftp_server.retrbinary(f"RETR {filename}", open(file, "wb").write)

file= open(file, "r")

DF_REPGRH = pd.DataFrame(data=file)

ARRAY_REPGRH = pd.array(DF_REPGRH[0][1:5])

ARRAY_GRHC = []

def JS_ARRAY():

    for i in range(len(ARRAY_REPGRH)):
        NEW_ELEMENT = ARRAY_REPGRH[i].replace("\n", "")

        ARRAY_GRHC.append(NEW_ELEMENT)

    updateChart(to_js(ARRAY_GRHC))

proxy = create_proxy(JS_ARRAY)

JS_ARRAY

I’m trying to pull a file from an ftp server and display the information in a bar chart.

However it’s giving me the error above

Thank you!
@JeffGlass

4

I think we’re in agreement here - ftplib does indeed us the socket library under the hood, as you can see here, and within the browser, sockets have the limitations I mentioned above. So you may be looking at needing to develop a way to shim the FTP connection using WebSockets or similar.