Created
April 17, 2015 14:14
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Clojurescript Transit XHR Handler
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(ns thoth.transit-xhr | |
(:require [cljs-time.format :as tf] | |
[cognitect.transit :as tr] | |
[com.cognitect.transit.types :as trt] | |
[goog.events :as events]) | |
(:import [goog.net XhrIo])) | |
(def http-methods | |
"The HTTP request codes we support Transit payloads in." | |
{:get "GET" | |
:post "POST"}) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Encoding/decoding | |
(def date-formatter (:date tf/formatters)) | |
(def write-handlers | |
{goog.date.Date | |
(tr/write-handler | |
(fn [d] "Date") | |
(fn [d] (tf/unparse-local-date date-formatter d)))}) | |
(def read-handlers | |
{"f" | |
(tr/read-handler | |
(fn [v] (trt/floatValue v))) | |
"Date" | |
(tr/read-handler | |
(fn [d] (tf/parse-local-date d)))}) | |
(def transit-json-reader | |
"A transit+json reader, using our custom handlers." | |
(tr/reader :json {:handlers read-handlers})) | |
(def transit-json-writer | |
"A transit+json writer, using our custom handlers." | |
(tr/writer :json {:handlers write-handlers})) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Public | |
(defn transit-xhr | |
"Makes an asynchronous HTTP request, encoding/decoding the data | |
sent/received as `transit+json`. Calls `on-complete` with the returned | |
(decoded) data." | |
[{:keys [method url data on-complete]}] | |
(let [xhr (XhrIo.)] | |
(events/listen | |
xhr goog.net.EventType.COMPLETE | |
(fn [e] | |
(let [resp (.getResponseText xhr) | |
data (tr/read transit-json-reader resp)] | |
(on-complete data)))) | |
(. xhr | |
(send url | |
(http-methods method) | |
(when data (tr/write transit-json-writer data)) | |
#js {"Content-Type" "application/transit+json"})))) |
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