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Contents
# encoding: utf-8
# This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
module NewRelic
module Agent
module Database
module PostgresExplainObfuscator
extend self
# 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.
QUOTED_STRINGS_REGEX = /'(?:[^']|'')*'|"(?:[^"]|"")*"/
LABEL_LINE_REGEX = /^([^:\n]*:\s+).*$/.freeze
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
end
end
end
end
Version data entries
41 entries across 41 versions & 2 rubygems