Failed to connect

[chyiever]

hello, dear authors,

Question 1
when I run the Usage Example from https://github.com/SCEDC/pystp/tree/master, I am sometimes faced this error:
(Sometimes, code is right at the beginning, but this error occurs after serval debugging times )

Exception has occurred: Exception
Failed to connect
  File ".\Untitled-1.py", line 73, in <module>
    client.connect()   # Open a connection.
Exception: Failed to connect

my codes are follows, do you know what's wrong? Very thanks!

from pystp import STPClient

client = STPClient()
client.connect()   # Open a connection.

# Download a catalog.
events = client.get_events(times=[datetime.datetime(2019, 10, 17), datetime.datetime(2019, 10, 17, 23, 59, 59)], mags=[2, 4])
# Get event IDs.
evids = [ev.resource_id.id for ev in events]
# Download all CI.CLC.BH waveforms for the events in the catalog.
waveforms = client.get_trig(evids, net='CI', sta='CLC', chan= 'BH_')

# Disconnect from the STP server.
client.disconnect()

Question 2

besides, when i run this codes, I find I can only download the first SAC file , because the PermissionError occured:

exception has occurred: PermissionError
[WinError 32] Another program is using this file, and the process can not access it: '.\39136904\39136904.CI.CLC.BHZ.sac'
File ".\Untitled-1.py", line 81, in <module>
waveforms = client.get_trig(evids, net='CI', sta='CLC', chan= 'BHZ')
PermissionError: [WinError 32] Another program is using this file, and the process can not access it : '.\39136904\39136904.CI.CLC.BHZ.sac'

I don't know if you've ever encountered this problem, but I'd be grateful if I could get your discussion and guidance！

[shang-lin]

The failure to connect could be due to the server being overloaded at the time.

I haven't been able to replicate the PermissionError. Do you get this error when running the code multiple times? Are you running anything else that accesses the downloaded files?

[AlexWu42]

Hello everyone. This issue only occurs on the Windows operating system and appears to originate from the "_recieve_data()" function in client.py.

At line 131 of client.py,

self.fdout.write(data)

the program writes data to the output file but does not subsequently close the file, resulting in the last downloaded file remaining OPEN in Python. When the "keep_files" parameter in the "get_trig()" function is set to its default value of False, the program attempts to delete this file and encounters an error.

This issue can be resolved by either setting "keep_files" to True or by adding the code self.fdout.close() following line 131 of client.py to properly close the output file.

I hope this would solve your issue!