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LFE HTTP Server Abstraction and Web Application Middleware Infrastructure

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lmug src lmug-mw-request-id.lfe
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src/lmug-mw-request-id.lfe 

(defmodule lmug-mw-request-id

  (doc "Add a request ID.")

  (behaviour lmug-middleware)

  (export

   (wrap 1) (wrap 2)))



(defun wrap (handler)

  "The same as #'wrap/2 but with an empty list for options."

  (wrap handler '()))



(defun wrap (handler _opts)

  "Middleware that adds a request ID for use in tracing, etc."

  (lambda (req)

    (let* ((id (integer_to_binary (trunc (* (rand:uniform) (math:pow 2 128)))))

           (resp (funcall handler (http.request:add-header req #"X-Request-ID" id))))

      (http.response:add-header resp

                                #"X-Request-ID"

                                id))))