[PATCH] osmo-gsm-tester[master]: esme: Fix race condition waiting for message response

[Pau Espin Pedrol]

Review at  https://gerrit.osmocom.org/3320

esme: Fix race condition waiting for message response

Sometimes in test esme_ms_sms_transaction.py we get the following error:
esme_ms_sms_transaction.py:54: ERR: ValueError: list.remove(x): x not in list

This appears due to a race condition because sms_send is used several times,
which means we don't wait or sync until we receive the response before calling
sms_send_wait_resp. That means when we wait for response of message with
seqnum X, we may receive response from message seqnum X-1 which was
initiated by sms_send and thus was not stored in the self.pdus_pending
array. As it's not there, trying to remove it triggers an exception.

Change-Id: Idf49f40eb46be1448b328a5c338ddbc4547148ff
---
M src/osmo_gsm_tester/esme.py
1 file changed, 2 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-tester refs/changes/20/3320/1

diff --git a/src/osmo_gsm_tester/esme.py b/src/osmo_gsm_tester/esme.py
index ff403c0..89eaa39 100644
--- a/src/osmo_gsm_tester/esme.py
+++ b/src/osmo_gsm_tester/esme.py
@@ -165,7 +165,8 @@
 
     def _process_pdus_pending(self, pdu, **kwargs):
         self.dbg('message sent resp with seq', pdu.sequence, ', pdus_pending:', self.pdus_pending)
-        self.pdus_pending.remove(pdu.sequence)
+        if pdu.sequence in self.pdus_pending:
+            self.pdus_pending.remove(pdu.sequence)
 
     def sms_send_wait_resp(self, sms_obj, mode, receipt=False):
         old_func = self.client.message_sent_handler

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Idf49f40eb46be1448b328a5c338ddbc4547148ff
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-tester
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>