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require 'digest'
module PgQuery
class ParserResult
def fingerprint
hash = FingerprintSubHash.new
fingerprint_tree(hash)
fp = PgQuery.hash_xxh3_64(hash.parts.join, FINGERPRINT_VERSION)
format('%016x', fp)
end
private
FINGERPRINT_VERSION = 3
class FingerprintSubHash
attr_reader :parts
def initialize
@parts = []
end
def update(part)
@parts << part
end
def flush_to(hash)
parts.each do |part|
hash.update part
end
end
end
def ignored_fingerprint_value?(val)
[nil, 0, false, [], ''].include?(val)
end
def fingerprint_value(val, hash, parent_node_name, parent_field_name, need_to_write_name) # rubocop:disable Metrics/CyclomaticComplexity
subhash = FingerprintSubHash.new
if val.is_a?(Google::Protobuf::RepeatedField)
# For lists that have exactly one untyped node, just output the parent field (if needed) and return
if val.length == 1 && val[0].is_a?(Node) && val[0].node.nil?
hash.update(parent_field_name) if need_to_write_name
return
end
fingerprint_list(val, subhash, parent_node_name, parent_field_name)
elsif val.is_a?(List)
fingerprint_list(val.items, subhash, parent_node_name, parent_field_name)
elsif val.is_a?(Google::Protobuf::MessageExts)
fingerprint_node(val, subhash, parent_node_name, parent_field_name)
elsif !ignored_fingerprint_value?(val)
subhash.update val.to_s
end
return if subhash.parts.empty?
hash.update(parent_field_name) if need_to_write_name
subhash.flush_to(hash)
end
def ignored_node_type?(node)
[A_Const, Alias, ParamRef, SetToDefault, IntList, OidList].include?(node.class) ||
node.is_a?(TypeCast) && (node.arg.node == :a_const || node.arg.node == :param_ref)
end
def node_protobuf_field_name_to_json_name(node_class, field)
node_class.descriptor.find { |d| d.name == field.to_s }.json_name
end
def fingerprint_node(node, hash, parent_node_name = nil, parent_field_name = nil) # rubocop:disable Metrics/CyclomaticComplexity
return if ignored_node_type?(node)
if node.is_a?(Node)
node_val = node.inner
unless node_val.nil? || ignored_node_type?(node_val)
unless node_val.is_a?(List)
postgres_node_name = node_protobuf_field_name_to_json_name(node.class, node.node)
hash.update(postgres_node_name)
end
fingerprint_value(node_val, hash, parent_node_name, parent_field_name, false)
end
return
end
postgres_node_name = node.class.name.split('::').last
node.to_h.keys.sort.each do |field_name|
val = node[field_name.to_s]
postgres_field_name = node_protobuf_field_name_to_json_name(node.class, field_name)
case postgres_field_name
when 'location'
next
when 'name'
next if [PrepareStmt, ExecuteStmt, DeallocateStmt, FunctionParameter].include?(node.class)
next if node.is_a?(ResTarget) && parent_node_name == 'SelectStmt' && parent_field_name == 'targetList'
when 'gid', 'savepoint_name'
next if node.is_a?(TransactionStmt)
when 'options'
next if [TransactionStmt, CreateFunctionStmt].include?(node.class)
when 'portalname'
next if [DeclareCursorStmt, FetchStmt, ClosePortalStmt].include?(node.class)
when 'conditionname'
next if [ListenStmt, UnlistenStmt, NotifyStmt].include?(node.class)
when 'args'
next if node.is_a?(DoStmt)
when 'relname'
next if node.is_a?(RangeVar) && node.relpersistence == 't'
if node.is_a?(RangeVar)
fingerprint_value(val.gsub(/\d{2,}/, ''), hash, postgres_node_name, postgres_field_name, true)
next
end
when 'stmt_len'
next if node.is_a?(RawStmt)
when 'stmt_location'
next if node.is_a?(RawStmt)
when 'kind'
if node.is_a?(A_Expr) && (val == :AEXPR_OP_ANY || val == :AEXPR_IN)
fingerprint_value(:AEXPR_OP, hash, postgres_node_name, postgres_field_name, true)
next
end
# libpg_query still outputs `str` parts when print a string node. Here we override that to
# the expected field name of `sval`.
when 'sval', 'fval', 'bsval'
postgres_field_name = 'str' if node.is_a?(String) || node.is_a?(BitString) || node.is_a?(Float)
end
fingerprint_value(val, hash, postgres_node_name, postgres_field_name, true)
end
end
def fingerprint_list(values, hash, parent_node_name, parent_field_name)
if %w[fromClause targetList cols rexpr valuesLists args].include?(parent_field_name)
values_subhashes = values.map do |val|
subhash = FingerprintSubHash.new
fingerprint_value(val, subhash, parent_node_name, parent_field_name, false)
subhash
end
values_subhashes.uniq!(&:parts)
values_subhashes.sort_by! { |s| PgQuery.hash_xxh3_64(s.parts.join, FINGERPRINT_VERSION) }
values_subhashes.each do |subhash|
subhash.flush_to(hash)
end
else
values.each do |val|
fingerprint_value(val, hash, parent_node_name, parent_field_name, false)
end
end
end
def fingerprint_tree(hash)
@tree.stmts.each do |node|
hash.update 'RawStmt'
fingerprint_node(node, hash)
end
end
end
end
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