Pyro4 does not throw ConnectionClosedError

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Hi,

I'm running pyro 4.31 and use it on my amazon ec2 instances. I'm mainly run=
ning spot price instances which means I often have to deal with a server th=
at goes down. So I need to be able to catch an exception when the my proxy =
object loses connection to the remote object.

So I have code similar to

for ...proxy =3D Pyro4.async(Pyro4.Proxy(pyro_uri))

future_result[i].proxy.run()
... some other code
for ....
try:
future_result[i].wait()
except ConnectionClosedError:....

At some point this worked and a ConnectionClosedError was thrown in case th=
e connection was lost, but now it just keeps hanging on the wait command ev=
en if the server is down. I looked in de Pyro4 code and I must say I don't =
see how a loss of connection can unblock the wait command as the wait comma=
nd waits until the Event boolean is set to True which is quite impossible t=
o do when the server is down. So how can I best detect when connection is l=
ost? If the server is still up, but I shutdown the pyro daemon then a conne=
ction closed error is thrown, but I want it when the entire server goes dow=
n.

EDIT:it seems that python's recv function does not throw an error which mig=
ht be the underlying cause why no error is thrown in Pryo4 either?

Best regards,
Dieter Devlaminck

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<span style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font=
-size: 12.8000001907349px; background-color: rgb(255, 255, 255);">Hi,=C2=
=A0</span><div style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif=
; font-size: 12.8000001907349px; background-color: rgb(255, 255, 255);"><br=
 /></div><div style=3D"color: rgb(34, 34, 34); font-family: arial, sans-ser=
if; font-size: 12.8000001907349px; background-color: rgb(255, 255, 255);">I=
'm running pyro 4.31 and use it on my amazon ec2 instances. I'm mainly runn=
ing spot price instances which means I often have to deal with a server tha=
t goes down. So I need to be able to catch an exception when the my proxy o=
bject loses connection to the remote object.</div><div style=3D"color: rgb(=
34, 34, 34); font-family: arial, sans-serif; font-size: 12.8000001907349px;=
 background-color: rgb(255, 255, 255);"><br /></div><div style=3D"color: rg=
b(34, 34, 34); font-family: arial, sans-serif; font-size: 12.8000001907349p=
x; background-color: rgb(255, 255, 255);">So I have code similar to</div><d=
iv style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-si=
ze: 12.8000001907349px; background-color: rgb(255, 255, 255);"><br /></div>=
<div style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-=
size: 12.8000001907349px; background-color: rgb(255, 255, 255);">for ...</d=
iv><div style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; fo=
nt-size: 12.8000001907349px; background-color: rgb(255, 255, 255);">=C2=A0 =
proxy =3D Pyro4.async(Pyro4.Proxy(pyro_<wbr>uri))<br /></wbr></div><div sty=
le=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 12=
.8000001907349px; background-color: rgb(255, 255, 255);">=C2=A0 future_resu=
lt[i].proxy.run()</div><div style=3D"color: rgb(34, 34, 34); font-family: a=
rial, sans-serif; font-size: 12.8000001907349px; background-color: rgb(255,=
 255, 255);">... some other code</div><div style=3D"color: rgb(34, 34, 34);=
 font-family: arial, sans-serif; font-size: 12.8000001907349px; background-=
color: rgb(255, 255, 255);">for ....</div><div style=3D"color: rgb(34, 34, =
34); font-family: arial, sans-serif; font-size: 12.8000001907349px; backgro=
und-color: rgb(255, 255, 255);">try:</div><div style=3D"color: rgb(34, 34, =
34); font-family: arial, sans-serif; font-size: 12.8000001907349px; backgro=
und-color: rgb(255, 255, 255);">=C2=A0 future_result[i].wait()</div><div st=
yle=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 1=
2.8000001907349px; background-color: rgb(255, 255, 255);">except Connection=
ClosedError:....</div><div style=3D"color: rgb(34, 34, 34); font-family: ar=
ial, sans-serif; font-size: 12.8000001907349px; background-color: rgb(255, =
255, 255);"><br /></div><div style=3D"color: rgb(34, 34, 34); font-family: =
arial, sans-serif; font-size: 12.8000001907349px; background-color: rgb(255=
, 255, 255);">At some point this worked and a ConnectionClosedError was thr=
own in case the connection was lost, but now it just keeps hanging on the w=
ait command even if the server is down. I looked in de Pyro4 code and I mus=
t say I don't see how a loss of connection can unblock the wait command as =
the wait command waits until the Event boolean is set to True which is quit=
e impossible to do when the server is down. So how can I best detect when c=
onnection is lost? If the server is still up, but I shutdown the pyro daemo=
n then a connection closed error is thrown, but I want it when the entire s=
erver goes down.</div><div style=3D"color: rgb(34, 34, 34); font-family: ar=
ial, sans-serif; font-size: 12.8000001907349px; background-color: rgb(255, =
255, 255);"><br /></div><div style=3D"color: rgb(34, 34, 34); font-family: =
arial, sans-serif; font-size: 12.8000001907349px; background-color: rgb(255=
, 255, 255);">EDIT:<span style=3D"font-size: 12.8000001907349px;">=C2=A0it =
seems that python's recv function does not throw an error which might be th=
e underlying cause why no error is thrown in Pryo4 either?</span></div><div=
 style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size=
: 12.8000001907349px; background-color: rgb(255, 255, 255);"><br /></div><d=
iv style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-si=
ze: 12.8000001907349px; background-color: rgb(255, 255, 255);">Best regards=
,</div><div style=3D"color: rgb(34, 34, 34); font-family: arial, sans-serif=
; font-size: 12.8000001907349px; background-color: rgb(255, 255, 255);">Die=
ter Devlaminck</div>

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