class Labkit::Tracing::RackMiddleware
RackMiddleware
is a rack middleware component for instrumenting incoming http requests into a Rails/Rack server
Constants
- REQUEST_METHOD
Public Class Methods
build_sanitized_url_from_env(env)
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Generate a sanitized (safe) request URL from the rack environment
# File lib/labkit/tracing/rack_middleware.rb, line 30 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
new(app)
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# File lib/labkit/tracing/rack_middleware.rb, line 14 def initialize(app) @app = app end
Public Instance Methods
call(env)
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# File lib/labkit/tracing/rack_middleware.rb, line 18 def call(env) method = env[REQUEST_METHOD] context = TracingUtils.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) } TracingUtils.with_tracing(operation_name: "http:#{method}", child_of: context, tags: tags) do |span| @app.call(env).tap { |status_code, _headers, _body| span.set_tag("http.status_code", status_code) } end end