Class: ChecksumAuditLog

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/checksum_audit_log.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.create_and_prune!(passed:, checked_uri:, file_set_id:, file_id:, expected_result:) ⇒ ChecksumAuditLog

Responsible for coordinating the creation (and possible pruning) of checksum log entries

Parameters:

  • passed (Boolean) —

    • Did the fixity test pass?

  • checked_uri (#to_s) —

    • Which URI did we check?

  • file_set_id (String) —

    • The file set ID of the file we are checking

  • file_id (String) —

    • The file ID that was checked

  • expected_result (String) —

    • The expected checksum

Returns:

See Also:



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# File 'app/models/checksum_audit_log.rb', line 36

def self.create_and_prune!(passed:, checked_uri:, file_set_id:, file_id:, expected_result:)
  log = create!(passed: passed, checked_uri: checked_uri, file_set_id: file_set_id, file_id: file_id, expected_result: expected_result)
  # A short-circuit. Given that .prune_history keeps all failing logs, there is no need to call prune history
  # unless the check passed.
  prune_history(file_set_id, checked_uri: checked_uri) if log.passed?
  log
end

.latest_checks ⇒ Object

Only the latest rows for a given file_set_id/checked_uri pair. Uses a join, so you might have to be careful combining. You would normally combine this with other conditions, this alone will return LOTS of records.



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# File 'app/models/checksum_audit_log.rb', line 10

def self.latest_checks
  # one crazy SQL trick to get the latest for each fileset/checked_uri combo
  # where there's no other self-join created_at greater -- only the greatest.
  joins("LEFT JOIN checksum_audit_logs c2 ON
          (checksum_audit_logs.file_set_id = c2.file_set_id AND
           checksum_audit_logs.checked_uri = c2.checked_uri AND
           checksum_audit_logs.created_at < c2.created_at)")
    .where("c2.id is NULL")
    .order("created_at desc, id desc")
end

.latest_for_file_set_id(file_set_id) ⇒ Object

From all ChecksumAuditLogs related to this file set, returns only the LATEST for each file_set_id/checked_uri pair.



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# File 'app/models/checksum_audit_log.rb', line 23

def self.latest_for_file_set_id(file_set_id)
  latest_checks.where(file_set_id: file_set_id)
end

.logs_for(file_set_id, checked_uri:) ⇒ Object

All logs for a particular file or version in a give file set, sorted by date descending.



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# File 'app/models/checksum_audit_log.rb', line 63

def self.logs_for(file_set_id, checked_uri:)
  ChecksumAuditLog.where(file_set_id: file_set_id, checked_uri: checked_uri).order('created_at desc, id desc')
end

.prune_history(file_set_id, checked_uri:) ⇒ Object

Prune old ChecksumAuditLog records. We keep only:

  • Latest check

  • failing checks

  • any checks immediately before or after a failing check, to provide context on known good dates surrounding failing.



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# File 'app/models/checksum_audit_log.rb', line 49

def self.prune_history(file_set_id, checked_uri:)
  all_logs = logs_for(file_set_id, checked_uri: checked_uri).reorder("created_at asc").to_a

  0.upto(all_logs.length - 2).each do |i|
    next if all_logs[i].failed?
    next if i.positive? && all_logs[i - 1].failed?
    next if all_logs[i + 1].failed?

    all_logs[i].destroy!
  end
end

Instance Method Details

#failed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/checksum_audit_log.rb', line 2

def failed?
  !passed?
end