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# frozen_string_literal: true
require 'opentracing'
module Gitlab
module Tracing
class RackMiddleware
include Common
REQUEST_METHOD = 'REQUEST_METHOD'
def initialize(app)
@app = app
end
def call(env)
method = env[REQUEST_METHOD]
context = tracer.extract(OpenTracing::FORMAT_RACK, env)
tags = {
'component' => 'rack',
'span.kind' => 'server',
'http.method' => method,
'http.url' => self.class.build_sanitized_url_from_env(env)
}
in_tracing_span(operation_name: "http:#{method}", child_of: context, tags: tags) do |span|
@app.call(env).tap do |status_code, _headers, _body|
span.set_tag('http.status_code', status_code)
end
end
end
# Generate a sanitized (safe) request URL from the rack environment
def self.build_sanitized_url_from_env(env)
request = ActionDispatch::Request.new(env)
original_url = request.original_url
uri = URI.parse(original_url)
uri.query = request.filtered_parameters.to_query if uri.query.present?
uri.to_s
end
end
end
end
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