Paramiko - Handle network failure during exec_command
1
I'm writing a script with Paramiko and I would like to handle network error if it happens during exec_command.
With the sample code below, if there is a network error from the beginning, it works well. The function is trying to execute itself until the connection is established.
But if the error happens in the middle of the function, it doesn't raise an exception and returns an empty string instead.
def execute(command, connection):
try:
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(connection.host, username=connection.username, password=connection.password)
log("Command: "+command, YELLOW)
dummy_stdin, stdout, stderr = client.exec_command("source ~/.bash_profile >
/dev/null; "+command)
err = stderr.read()
res = stdout.read()
client.close()
if err.strip() == "OK":
log(err.strip(), BLANK)
return err.strip()
elif err != '':
log(err.strip(), RED)
sys.exit()
else:
log(res.strip(), BLANK)
return res.strip()
except:
log("Network failure. Trying again ...", RED)
return execute(command, connection)
Thanks for your help!
python ssh paramiko
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
1
I'm writing a script with Paramiko and I would like to handle network error if it happens during exec_command.
With the sample code below, if there is a network error from the beginning, it works well. The function is trying to execute itself until the connection is established.
But if the error happens in the middle of the function, it doesn't raise an exception and returns an empty string instead.
def execute(command, connection):
try:
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(connection.host, username=connection.username, password=connection.password)
log("Command: "+command, YELLOW)
dummy_stdin, stdout, stderr = client.exec_command("source ~/.bash_profile >
/dev/null; "+command)
err = stderr.read()
res = stdout.read()
client.close()
if err.strip() == "OK":
log(err.strip(), BLANK)
return err.strip()
elif err != '':
log(err.strip(), RED)
sys.exit()
else:
log(res.strip(), BLANK)
return res.strip()
except:
log("Network failure. Trying again ...", RED)
return execute(command, connection)
Thanks for your help!
python ssh paramiko
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Did you try testingclient.get_transport().is_active()?
– Martin Prikryl
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Did you test it? Does it returnfalsewhen the connection is lost?
– Martin Prikryl
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago
add a comment |
1
1
1
1
I'm writing a script with Paramiko and I would like to handle network error if it happens during exec_command.
With the sample code below, if there is a network error from the beginning, it works well. The function is trying to execute itself until the connection is established.
But if the error happens in the middle of the function, it doesn't raise an exception and returns an empty string instead.
def execute(command, connection):
try:
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(connection.host, username=connection.username, password=connection.password)
log("Command: "+command, YELLOW)
dummy_stdin, stdout, stderr = client.exec_command("source ~/.bash_profile >
/dev/null; "+command)
err = stderr.read()
res = stdout.read()
client.close()
if err.strip() == "OK":
log(err.strip(), BLANK)
return err.strip()
elif err != '':
log(err.strip(), RED)
sys.exit()
else:
log(res.strip(), BLANK)
return res.strip()
except:
log("Network failure. Trying again ...", RED)
return execute(command, connection)
Thanks for your help!
python ssh paramiko
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm writing a script with Paramiko and I would like to handle network error if it happens during exec_command.
With the sample code below, if there is a network error from the beginning, it works well. The function is trying to execute itself until the connection is established.
But if the error happens in the middle of the function, it doesn't raise an exception and returns an empty string instead.
def execute(command, connection):
try:
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(connection.host, username=connection.username, password=connection.password)
log("Command: "+command, YELLOW)
dummy_stdin, stdout, stderr = client.exec_command("source ~/.bash_profile >
/dev/null; "+command)
err = stderr.read()
res = stdout.read()
client.close()
if err.strip() == "OK":
log(err.strip(), BLANK)
return err.strip()
elif err != '':
log(err.strip(), RED)
sys.exit()
else:
log(res.strip(), BLANK)
return res.strip()
except:
log("Network failure. Trying again ...", RED)
return execute(command, connection)
Thanks for your help!
python ssh paramiko
python ssh paramiko
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 14 hours ago
asked 17 hours ago
Matthieu D
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 17 hours ago
Matthieu D
85
asked 17 hours ago
Matthieu D
85
85
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Matthieu D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Did you try testingclient.get_transport().is_active()?
– Martin Prikryl
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Did you test it? Does it returnfalsewhen the connection is lost?
– Martin Prikryl
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago
add a comment |
Did you try testingclient.get_transport().is_active()?
– Martin Prikryl
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Did you test it? Does it returnfalsewhen the connection is lost?
– Martin Prikryl
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago
Did you try testing
client.get_transport().is_active()?– Martin Prikryl
16 hours ago
Did you try testing
client.get_transport().is_active()?– Martin Prikryl
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Did you test it? Does it return
false when the connection is lost?– Martin Prikryl
16 hours ago
Did you test it? Does it return
false when the connection is lost?– Martin Prikryl
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago
add a comment |
1 Answer
1
active
oldest
votes
0
Test for an active connection after you finish reading a command output:
client.get_transport().is_active()
answered 14 hours ago
Martin Prikryl
85.4k22163355
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Test for an active connection after you finish reading a command output:
client.get_transport().is_active()
answered 14 hours ago
Martin Prikryl
85.4k22163355
add a comment |
0
Test for an active connection after you finish reading a command output:
client.get_transport().is_active()
answered 14 hours ago
Martin Prikryl
85.4k22163355
add a comment |
0
0
0
Test for an active connection after you finish reading a command output:
client.get_transport().is_active()
answered 14 hours ago
Martin Prikryl
85.4k22163355
Test for an active connection after you finish reading a command output:
client.get_transport().is_active()
answered 14 hours ago
Martin Prikryl
85.4k22163355
answered 14 hours ago
Martin Prikryl
85.4k22163355
answered 14 hours ago
Martin Prikryl
85.4k22163355
answered 14 hours ago
Martin Prikryl
85.4k22163355
85.4k22163355
add a comment |
add a comment |
Matthieu D is a new contributor. Be nice, and check out our Code of Conduct.
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Did you try testing
client.get_transport().is_active()?– Martin Prikryl
16 hours ago
Awesome. Just what I was looking for. Thanks a lot!
– Matthieu D
16 hours ago
Did you test it? Does it return
falsewhen the connection is lost?– Martin Prikryl
16 hours ago
Yes indeed, it returns False. I juste have to test this condition before returning the result.
– Matthieu D
16 hours ago