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104 lines
2.7 KiB
Clojure
104 lines
2.7 KiB
Clojure
;; This Source Code Form is subject to the terms of the Mozilla Public
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;; License, v. 2.0. If a copy of the MPL was not distributed with this
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;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
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;;
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;; Copyright (c) KALEIDOS INC
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(ns app.util.worker
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"A lightweight layer on top of webworkers api."
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(:require
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[app.common.uuid :as uuid]
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[app.util.object :as obj]
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[app.worker.messages :as wm]
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[beicon.core :as rx]))
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(declare handle-response)
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(defrecord Worker [instance stream])
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(defn- send-message!
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([worker message]
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(send-message! worker message nil))
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([worker {sender-id :sender-id :as message} {:keys [many?] :or {many? false}}]
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(let [take-messages
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(fn [ob]
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(if many?
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(rx/take-while #(not (:completed %)) ob)
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(rx/take 1 ob)))
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transfer (:transfer message)
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data (cond-> (wm/encode (dissoc message :transfer))
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(some? transfer)
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(obj/set! "transfer" transfer))
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instance (:instance worker)]
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(if (some? instance)
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(do (.postMessage instance data transfer)
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(->> (:stream worker)
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(rx/filter #(= (:reply-to %) sender-id))
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(take-messages)
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(rx/filter (complement :dropped))
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(rx/map handle-response)))
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(rx/empty)))))
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(defn ask!
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([worker message]
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(ask! worker message nil))
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([worker message transfer]
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(send-message!
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worker
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{:sender-id (uuid/next)
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:payload message
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:transfer transfer})))
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(defn ask-many!
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([worker message]
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(ask-many! worker message nil))
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([worker message transfer]
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(send-message!
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worker
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{:sender-id (uuid/next)
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:payload message
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:transfer transfer}
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{:many? true})))
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(defn ask-buffered!
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([worker message]
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(ask-buffered! worker message nil))
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([worker message transfer]
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(send-message!
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worker
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{:sender-id (uuid/next)
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:payload message
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:buffer? true
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:transfer transfer})))
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(defn init
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"Return a initialized webworker instance."
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[path on-error]
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(let [instance (js/Worker. path)
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bus (rx/subject)
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worker (Worker. instance (rx/to-observable bus))
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handle-message
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(fn [event]
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(let [message (wm/decode (.-data event))]
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(if (:error message)
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(on-error (:error message))
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(rx/push! bus message))))
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handle-error
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(fn [error]
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(on-error worker (.-data error)))]
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(.addEventListener instance "message" handle-message)
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(.addEventListener instance "error" handle-error)
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worker))
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(defn- handle-response
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[{:keys [payload error]}]
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(if-let [{:keys [data message]} error]
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(throw (ex-info message data))
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payload))
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