[pmg-devel] [RFC PATCH pmg-api] api: cluster status: add timeout to api call

Dominik Csapak d.csapak at proxmox.com
Mon Apr 17 13:40:35 CEST 2023

we query each other host in the cluster for it's status, but if we reach
the 30s limit of the pmgproxy, we get a

 communication failure(0)

error in the gui. To prevent this, add a (much) shorter timeout to each
api call, which makes sure that the whole status call succeeds.

Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
sending as RFC because i am not sure if this is the best approach:
we could have very asymmetric http call times, which would maybe
all go through without timeout, but we cannot really know that

Another approach could be to give as much time as we have left (with
buffer) and subtract the time we took for each call. This would be a
problem if the first takes so long that we don't have any time left
for the other calls...

 src/PMG/API2/Cluster.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/PMG/API2/Cluster.pm b/src/PMG/API2/Cluster.pm
index 84dafab..5e0a987 100644
--- a/src/PMG/API2/Cluster.pm
+++ b/src/PMG/API2/Cluster.pm
@@ -217,6 +217,9 @@ __PACKAGE__->register_method({
 	    $res = [ $ni ];
+	# 30 seconds minus 5 seconds buffer time, split evenly for the other hosts
+	my $timeout = 25 / (scalar(@$res) - 1);
 	my $rpcenv = PMG::RESTEnvironment->get();
         my $authuser = $rpcenv->get_user();
 	my $ticket = $rpcenv->get_ticket();
@@ -231,6 +234,7 @@ __PACKAGE__->register_method({
 			ticket => $ticket,
 			cookie_name => 'PMGAuthCookie',
 			host => $ni->{ip},
+			timeout => $timeout,
 			cached_fingerprints => {
 			    $ni->{fingerprint} => 1,

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