1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
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)
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, Null].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)
# Use protobuf descriptor once json_name support is fixed: https://github.com/protocolbuffers/protobuf/pull/8356
# node_class.descriptor.find { |d| d.name == field.to_s }.json_name
INTERNAL_PROTO_FIELD_NAME_TO_JSON_NAME.fetch([node_class, field])
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)
return if node.node.nil?
node_val = node[node.node.to_s]
unless 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].include?(node.class)
next if node.is_a?(ResTarget) && parent_node_name == 'SelectStmt' && parent_field_name == 'targetList'
when 'gid', 'options', 'savepoint_name'
next if node.is_a?(TransactionStmt)
when 'portalname'
next if [DeclareCursorStmt, FetchStmt, ClosePortalStmt].include?(node.class)
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
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
|
