module Mmtrix::Agent::Database::PostgresExplainObfuscator
Constants
- LABEL_LINE_REGEX
- QUOTED_STRINGS_REGEX
Note that this regex can’t be shared with the ones in the
Database::Obfuscator
class because here we don’t look for backslash-escaped strings (and those regexes are backwards).
Public Instance Methods
obfuscate(explain)
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# File lib/mmtrix/agent/database/postgres_explain_obfuscator.rb, line 19 def obfuscate(explain) # First, we replace all single-quoted strings. # This is necessary in order to deal with multi-line string constants # embedded in the explain output. # # Note that we look for both single or double quotes but do not # replace double quotes in order to avoid accidentally latching onto a # single quote character embedded within a quoted identifier (such as # a table name). # # Note also that we make no special provisions for backslash-escaped # single quotes (\') because these are canonicalized to two single # quotes ('') in the explain output. explain.gsub!(QUOTED_STRINGS_REGEX) do |match| match.start_with?('"') ? match : '?' end # Now, mask anything after the first colon (:). # All parts of the query that can appear in the explain output are # prefixed with "<label>: ", so we want to preserve the label, but # remove the rest of the line. explain.gsub!(LABEL_LINE_REGEX, '\1?') explain end