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Contents
require 'ddtrace/ext/distributed'
require 'ddtrace/distributed_tracing/headers/headers'
module Datadog
module DistributedTracing
module Headers
# Datadog provides helpers to inject or extract headers for Datadog style headers
module Datadog
include Ext::DistributedTracing
def self.inject!(context, env)
return if context.nil?
env[HTTP_HEADER_TRACE_ID] = context.trace_id.to_s
env[HTTP_HEADER_PARENT_ID] = context.span_id.to_s
env[HTTP_HEADER_SAMPLING_PRIORITY] = context.sampling_priority.to_s unless context.sampling_priority.nil?
env[HTTP_HEADER_ORIGIN] = context.origin.to_s unless context.origin.nil?
end
def self.extract(env)
# Extract values from headers
headers = Headers.new(env)
trace_id = headers.id(HTTP_HEADER_TRACE_ID)
parent_id = headers.id(HTTP_HEADER_PARENT_ID)
origin = headers.header(HTTP_HEADER_ORIGIN)
sampling_priority = headers.number(HTTP_HEADER_SAMPLING_PRIORITY)
# Return early if this propagation is not valid
# DEV: To be valid we need to have a trace id and a parent id or when it is a synthetics trace, just the trace id
# DEV: `DistributedHeaders#id` will not return 0
return unless (trace_id && parent_id) || (origin == 'synthetics' && trace_id)
# Return new context
::Datadog::Context.new(trace_id: trace_id,
span_id: parent_id,
origin: origin,
sampling_priority: sampling_priority)
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems