[PATCH] osmo-gsm-tester[master]: error log: clarify for reserving more resources than available

[Neels Hofmeyr]

Review at  https://gerrit.osmocom.org/2851

error log: clarify for reserving more resources than available

When trying to reserve more resources than available in the resources.conf,
actually print an intelligible error message: catch the nameless error from
solve() and fill in what was requested for solution.

Change-Id: Iba3707f1aaeb40a58c616c33af52a60c9a2e7e1f
---
M selftest/resource_test.py
M src/osmo_gsm_tester/resource.py
2 files changed, 13 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-tester refs/changes/51/2851/1

diff --git a/selftest/resource_test.py b/selftest/resource_test.py
index 08f1fbf..c78485e 100755
--- a/selftest/resource_test.py
+++ b/selftest/resource_test.py
@@ -39,7 +39,7 @@
                      [2],
                      [0, 2] ]) 
     assert False
-except resource.NoResourceExn as e:
+except resource.NotSolvable as e:
     print(e)
 
 print('- test removing a Resources list from itself')
diff --git a/src/osmo_gsm_tester/resource.py b/src/osmo_gsm_tester/resource.py
index 3e8924a..52b23c7 100644
--- a/src/osmo_gsm_tester/resource.py
+++ b/src/osmo_gsm_tester/resource.py
@@ -337,7 +337,13 @@
                 continue
 
             # figure out who gets what
-            solution = solve(all_matches)
+            try:
+                solution = solve(all_matches)
+            except NotSolvable:
+                # instead of a cryptic error message, raise an exception that
+                # conveys meaning to the user.
+                raise NoResourceExn('Could not resolve request to reserve resources: '
+                                    '%d x %s with requirements: %r' % (len(want_list), key, want_list))
             picked = [ my_list[i] for i in solution if i is not None ]
             for_origin.dbg('Picked', config.tostr(picked))
             matches[key] = picked
@@ -364,6 +370,9 @@
             for item in item_list:
                 item[RESERVED_KEY] = origin_id
 
+
+class NotSolvable(Exception):
+    pass
 
 def solve(all_matches):
     '''
@@ -403,8 +412,8 @@
 
     solution = search_in_permutations()
     if not solution:
-        raise NoResourceExn('The requested resource requirements are not solvable %r'
-                            % all_matches)
+        raise NotSolvable('The requested resource requirements are not solvable %r'
+                          % all_matches)
     return solution
 
 

-- 
To view, visit https://gerrit.osmocom.org/2851
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Iba3707f1aaeb40a58c616c33af52a60c9a2e7e1f
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-tester
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>