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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
# frozen_string_literal: true
module Jaeger
module Extractors
class SerializedJaegerTrace
def self.parse(trace)
return nil if !trace || trace == ''
trace_arguments = trace.split(':')
return nil if trace_arguments.size != 4
trace_id = TraceId.base16_hex_id_to_uint128(trace_arguments[0])
span_id, parent_id, flags = trace_arguments[1..3].map(&TraceId.method(:base16_hex_id_to_uint64))
return nil if trace_id.zero? || span_id.zero?
SpanContext.new(
trace_id: trace_id,
parent_id: parent_id,
span_id: span_id,
flags: flags
)
end
end
class JaegerTextMapCodec
def self.extract(carrier)
context = SerializedJaegerTrace.parse(carrier['uber-trace-id'])
return nil unless context
carrier.each do |key, value|
baggage_match = key.match(/\Auberctx-([\w-]+)\Z/)
if baggage_match
context.set_baggage_item(baggage_match[1], value)
end
end
context
end
end
class JaegerRackCodec
def self.extract(carrier)
serialized_trace = carrier['HTTP_UBER_TRACE_ID']
serialized_trace = CGI.unescape(serialized_trace) if serialized_trace
context = SerializedJaegerTrace.parse(serialized_trace)
return nil unless context
carrier.each do |key, value|
baggage_match = key.match(/\AHTTP_UBERCTX_(\w+)\Z/)
if baggage_match
key = baggage_match[1].downcase.tr('_', '-')
context.set_baggage_item(key, CGI.unescape(value))
end
end
context
end
end
class JaegerBinaryCodec
def self.extract(_carrier)
warn 'Jaeger::Client with binary format is not supported yet'
end
end
class B3RackCodec
class Keys
TRACE_ID = 'HTTP_X_B3_TRACEID'
SPAN_ID = 'HTTP_X_B3_SPANID'
PARENT_SPAN_ID = 'HTTP_X_B3_PARENTSPANID'
FLAGS = 'HTTP_X_B3_FLAGS'
SAMPLED = 'HTTP_X_B3_SAMPLED'
end.freeze
def self.extract(carrier)
B3CodecCommon.extract(carrier, Keys)
end
end
class B3TextMapCodec
class Keys
TRACE_ID = 'x-b3-traceid'
SPAN_ID = 'x-b3-spanid'
PARENT_SPAN_ID = 'x-b3-parentspanid'
FLAGS = 'x-b3-flags'
SAMPLED = 'x-b3-sampled'
end.freeze
def self.extract(carrier)
B3CodecCommon.extract(carrier, Keys)
end
end
class B3CodecCommon
def self.extract(carrier, keys)
return nil if carrier[keys::TRACE_ID].nil? || carrier[keys::SPAN_ID].nil?
trace_id = if carrier[keys::TRACE_ID].length <= 16
TraceId.base16_hex_id_to_uint64(carrier[keys::TRACE_ID])
else
TraceId.base16_hex_id_to_uint128(carrier[keys::TRACE_ID])
end
span_id = TraceId.base16_hex_id_to_uint64(carrier[keys::SPAN_ID])
parent_id = TraceId.base16_hex_id_to_uint64(carrier[keys::PARENT_SPAN_ID])
flags = parse_flags(carrier[keys::FLAGS], carrier[keys::SAMPLED])
return nil if span_id.zero? || trace_id.zero?
SpanContext.new(
trace_id: trace_id,
parent_id: parent_id,
span_id: span_id,
flags: flags
)
end
# if the flags header is '1' then the sampled header should not be present
def self.parse_flags(flags_header, sampled_header)
if flags_header == '1'
Jaeger::SpanContext::Flags::DEBUG
else
TraceId.base16_hex_id_to_uint64(sampled_header)
end
end
private_class_method :parse_flags
end
class TraceContextRackCodec
# Internal regex used to identify the TraceContext version
VERSION_PATTERN = /^([0-9a-fA-F]{2})-(.+)$/.freeze
# Internal regex used to parse fields in version 0
HEADER_V0_PATTERN = /^([0-9a-fA-F]{32})-([0-9a-fA-F]{16})(-([0-9a-fA-F]{2}))?$/.freeze
def self.extract(carrier)
header_value = carrier['HTTP_TRACEPARENT']
version_match = VERSION_PATTERN.match(header_value)
return nil unless version_match
# We currently only support version 0
return nil if version_match[1].to_i(16) != 0
match = HEADER_V0_PATTERN.match(version_match[2])
return nil unless match
trace_id = TraceId.base16_hex_id_to_uint128(match[1])
span_id = TraceId.base16_hex_id_to_uint64(match[2])
flags = TraceId.base16_hex_id_to_uint64(match[4])
return nil if trace_id.zero? || span_id.zero?
SpanContext.new(trace_id: trace_id, span_id: span_id, flags: flags)
end
end
DEFAULT_EXTRACTORS = {
OpenTracing::FORMAT_TEXT_MAP => JaegerTextMapCodec,
OpenTracing::FORMAT_BINARY => JaegerBinaryCodec,
OpenTracing::FORMAT_RACK => JaegerRackCodec
}.freeze
def self.prepare(extractors)
DEFAULT_EXTRACTORS.reduce(extractors) do |acc, (format, default)|
provided_extractors = Array(extractors[format])
provided_extractors += [default] if provided_extractors.empty?
acc.merge(format => provided_extractors)
end
end
end
end
|
