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Contents
require 'ddtrace/configuration'
require 'ddtrace/span'
require 'ddtrace/ext/priority'
module Datadog
module DistributedTracing
module Headers
# Helpers module provides common helper functions for distributed tracing headers
module Helpers
# Base provides common methods for distributed header helper classes
def self.clamp_sampling_priority(sampling_priority)
# B3 doesn't have our -1 (USER_REJECT) and 2 (USER_KEEP) priorities so convert to acceptable 0/1
if sampling_priority < 0
sampling_priority = Ext::Priority::AUTO_REJECT
elsif sampling_priority > 1
sampling_priority = Ext::Priority::AUTO_KEEP
end
sampling_priority
end
def self.truncate_base16_number(value)
# Lowercase if we want to parse base16 e.g. 3E8 => 3e8
# DEV: Ruby will parse `3E8` just fine, but to test
# `num.to_s(base) == value` we need to lowercase
value = value.downcase
# Truncate to trailing 16 characters if length is greater than 16
# https://github.com/apache/incubator-zipkin/blob/21fe362899fef5c593370466bc5707d3837070c2/zipkin/src/main/java/zipkin2/storage/StorageComponent.java#L49-L53
# DEV: This ensures we truncate B3 128-bit trace and span ids to 64-bit
value = value[value.length - 16, 16] if value.length > 16
# Remove any leading zeros
# DEV: When we call `num.to_s(16)` later Ruby will not add leading zeros
# for us so we want to make sure the comparision will work as expected
# DEV: regex, remove all leading zeros up until we find the last 0 in the string
# or we find the first non-zero, this allows `'0000' -> '0'` and `'00001' -> '1'`
value.sub(/^0*(?=(0$)|[^0])/, '')
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems