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# frozen_string_literal: true
require "opentracing"
module Labkit
module Tracing
# https://edgeapi.rubyonrails.org/classes/ActiveSupport/Notifications/Instrumenter.html#method-c-new
class AbstractInstrumenter
def start(_name, _id, payload)
scope = OpenTracing.start_active_span(span_name(payload))
scope_stack.push scope
end
def finish(_name, _id, payload)
scope = scope_stack.pop
span = scope.span
Labkit::Tracing::TracingUtils.log_common_fields_on_span(span, span_name(payload))
# exception_object is the standard exception payload from ActiveSupport::Notifications
# https://github.com/rails/rails/blob/v6.0.3.1/activesupport/lib/active_support/notifications/instrumenter.rb#L26
exception = payload[:exception_object].presence || payload[:exception].presence
Labkit::Tracing::TracingUtils.log_exception_on_span(span, exception)
tags(payload).each do |k, v|
span.set_tag(k, v)
end
scope.close
end
def scope_stack
Thread.current[:_labkit_trace_scope_stack] ||= []
end
def span_name(_payload)
raise "span_name not implemented"
end
def tags(_payload)
{}
end
end
end
end
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