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action #121444

Updated by mkittler over 1 year ago

## Observation 
 We saw the following error on o3 today: 
 ``` 
 [2022-12-05T10:45:55.571462Z] [error] [JBm0Hyi1i4oq] Can't open file 
 "/var/lib/openqa/testresults/01371/01371619-opensuse-Jump:15.2-DVD-ppc64le-Build39.13-extra_tests_in_textmode@ppc64le/ 
 details-gd.json": No such file or directory at /usr/share/openqa/script/../lib/OpenQA/Schema/Result/JobModules.pm line 
 95. 
 ``` 

 It seems like the test got deleted because we have this in the access log: 
 ``` 
 [05/Dec/2022:10:45:50 +0000] "GET /tests/1371619 HTTP/1.1" 200 
 ``` 
 So the test was still there but when loading results it was already deleted, because now it returns a 404. 

 The according code is 

 ``` 
  93       return {} unless -r (my $file = path($dir, "details-$name.json")); 
  94  
  95       my $json_data = $file->slurp; 
  96       die qq{Malformed JSON file "$file": $@} unless my $json = eval { decode_json($json_data) }; 
 ``` 

 so not an atomic operation. 

 ## Acceptance criteria 
 * **AC1:** A unit test ensures that a not readable test module result file is handled and gracefully returned to the web UI and no error in log 
 * **AC2:** The handling is atomic, not "check if readable and then read" 

 ## Suggestions 
 * Instead of trying to read and then fail we should handle the read attempt as we handle the exception in line 96 and return `{}` in case of error

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