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# frozen_string_literal: true
require "cgi"
module Labkit
module Tracing
# Factory provides tools for setting up and configuring the
# distributed tracing system within the process, given the
# tracing connection string
class Factory
OPENTRACING_SCHEME = "opentracing"
def self.create_tracer(service_name, connection_string)
return unless connection_string.present?
begin
opentracing_details = parse_connection_string(connection_string)
driver_name = opentracing_details[:driver_name]
case driver_name
when "jaeger"
JaegerFactory.create_tracer(service_name, opentracing_details[:options])
else
raise "Unknown driver: #{driver_name}"
end
# Can't create the tracer? Warn and continue sans tracer
rescue StandardError => e
warn "Unable to instantiate tracer: #{e}"
nil
end
end
def self.parse_connection_string(connection_string)
parsed = URI.parse(connection_string)
raise "Invalid tracing connection string" unless valid_uri?(parsed)
{ driver_name: parsed.host, options: parse_query(parsed.query) }
end
private_class_method :parse_connection_string
def self.parse_query(query)
return {} unless query
CGI.parse(query).symbolize_keys.transform_values(&:first)
end
private_class_method :parse_query
def self.valid_uri?(uri)
return false unless uri
uri.scheme == OPENTRACING_SCHEME && uri.host.to_s =~ /^[a-z0-9_]+$/ && uri.path.empty?
end
private_class_method :valid_uri?
end
end
end
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