module Datadog::DistributedTracing::Headers::Datadog
Datadog
provides helpers to inject or extract headers for Datadog
style headers
Public Class Methods
extract(env)
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# File lib/ddtrace/distributed_tracing/headers/datadog.rb, line 21 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 && trace_id) # Return new context ::Datadog::Context.new(trace_id: trace_id, span_id: parent_id, origin: origin, sampling_priority: sampling_priority) end
inject!(context, env)
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# File lib/ddtrace/distributed_tracing/headers/datadog.rb, line 12 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