class Rack::RequestId
Public: Rack
middleware that stores the X-Request-Id header in a thread local variable.
Heroku has a labs feature called request_id, which can be used to tracking a request through the system.
app - The Rack
app.
Examples
use Rack::RequestId, key: :request_id, value: -> (env) { env['HTTP_X_REQUEST_ID'] }, response_header: 'X-Request-Id' logger.info "request_id=#{RequestId.request_id} Hello world" # => request_id=a08a6712229fb991c0e5026c246862c7 Hello world
Constants
- REQUEST_HEADER
- RESPONSE_HEADER
Public Class Methods
new(app, options = nil)
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# File lib/rack/request_id.rb, line 23 def initialize(app, options = nil) @app = app @options = options || default_options end
Public Instance Methods
call(env)
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# File lib/rack/request_id.rb, line 28 def call(env) ::RequestId.with(@options[:key], @options[:value].call(env) || generate) do status, headers, body = @app.call(env) if @options[:response_header] headers[@options[:response_header]] ||= ::RequestId.get(@options[:key]).to_s end [status, headers, body] end end
Private Instance Methods
default_options()
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# File lib/rack/request_id.rb, line 42 def default_options { key: :request_id, value: lambda { |env| env[REQUEST_HEADER] }, response_header: RESPONSE_HEADER } end
generate()
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# File lib/rack/request_id.rb, line 46 def generate SecureRandom.uuid if ::RequestId.configuration.generate end