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repl.cljc
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repl.cljc
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(ns figwheel.repl
(:require
[clojure.string :as string]
#?@(:cljs [[goog.object :as gobj]
[goog.storage.mechanism.mechanismfactory :as storage-factory]
[goog.Uri :as guri]
[goog.string :as gstring]
[goog.net.jsloader :as loader]
[goog.net.XhrIo :as xhrio]
[goog.log :as glog]
[goog.array :as garray]
[goog.json :as gjson]
[goog.html.legacyconversions :as conv]
[goog.userAgent.product :as product]]
:clj [[clojure.data.json :as json]
[clojure.set :as set]
[clojure.edn :as edn]
[clojure.java.browse :as browse]
[cljs.repl]
[cljs.stacktrace]
[clojure.java.io :as io]
[clojure.string :as string]
[figwheel.server.ring]]))
(:import
#?@(:cljs [goog.net.WebSocket
goog.debug.Console
[goog.Uri QueryData]
[goog Promise]
[goog.storage.mechanism HTML5SessionStorage]]
:clj [java.util.concurrent.ArrayBlockingQueue
java.net.URLDecoder
[java.lang ProcessBuilder Process]])))
(def default-port 9500)
#?(:cljs (do
;; TODO dev only
;; --------------------------------------------------
;; Logging
;; --------------------------------------------------
;;
;; Levels
;; goog.debug.Logger.Level.(SEVERE WARNING INFO CONFIG FINE FINER FINEST)
;;
;; set level (.setLevel logger goog.debug.Logger.Level.INFO)
;; disable (.setCapturing log-console false)
(defonce logger (glog/getLogger "Figwheel REPL"))
(defn ^:export console-logging []
(when-not (gobj/get goog.debug.Console "instance")
(let [c (goog.debug.Console.)]
;; don't display time
(doto (.getFormatter c)
(gobj/set "showAbsoluteTime" false)
(gobj/set "showRelativeTime" false))
(gobj/set goog.debug.Console "instance" c)
c))
(when-let [console-instance (gobj/get goog.debug.Console "instance")]
(.setCapturing console-instance true)
true))
(defonce log-console (console-logging))
(defn debug [msg]
(glog/log logger goog.debug.Logger.Level.FINEST msg))
;; TODO dev
#_(.setLevel logger goog.debug.Logger.Level.FINEST)
;; --------------------------------------------------------------
;; Bootstrap goog require reloading
;; --------------------------------------------------------------
(declare queued-file-reload)
(defn unprovide! [ns]
(let [path (gobj/get js/goog.dependencies_.nameToPath ns)]
(gobj/remove js/goog.dependencies_.visited path)
(gobj/remove js/goog.dependencies_.written path)
(gobj/remove js/goog.dependencies_.written (str js/goog.basePath path))))
;; this will not work unless bootstrap has been called
(defn figwheel-require [src reload]
;; require is going to be called
(set! (.-require js/goog) figwheel-require)
(when (= reload "reload-all")
(set! (.-cljsReloadAll_ js/goog) true))
(when (or reload (.-cljsReloadAll_ js/goog))
(unprovide! src))
(let [res (.require_figwheel_backup_ js/goog src)]
(when (= reload "reload-all")
(set! (.-cljsReloadAll_ js/goog) false))
res))
(defn bootstrap-goog-base
"Reusable browser REPL bootstrapping. Patches the essential functions
in goog.base to support re-loading of namespaces after page load."
[]
;; The biggest problem here is that clojure.browser.repl might have
;; patched this or might patch this afterward
(when-not js/COMPILED
(when-not (.-require_figwheel_backup_ js/goog)
(set! (.-require_figwheel_backup_ js/goog) (or js/goog.require__ js/goog.require)))
(set! (.-isProvided_ js/goog) (fn [name] false))
(when-not (and (exists? js/cljs)
(exists? js/cljs.user))
(goog/constructNamespace_ "cljs.user"))
(set! (.-CLOSURE_IMPORT_SCRIPT goog/global) queued-file-reload)
(set! (.-require js/goog) figwheel-require)))
(defn patch-goog-base []
(defonce bootstrapped-cljs (do (bootstrap-goog-base) true)))
;; --------------------------------------------------------------
;; File reloading on different platforms
;; --------------------------------------------------------------
;; this assumes no query string on url
(defn add-cache-buster [url]
(.makeUnique (guri/parse url)))
(def gloader
(cond
(exists? loader/safeLoad)
#(loader/safeLoad (conv/trustedResourceUrlFromString (str %1)) %2)
(exists? loader/load) #(loader/load (str %1) %2)
:else (throw (ex-info "No remote script loading function found." {}))))
(defn reload-file-in-html-env
[request-url callback]
{:pre [(string? request-url) (not (nil? callback))]}
(doto (gloader (add-cache-buster request-url) #js {:cleanupWhenDone true})
(.addCallback #(apply callback [true]))
(.addErrback #(apply callback [false]))))
(def ^:export write-script-tag-import reload-file-in-html-env)
(defn ^:export worker-import-script [request-url callback]
{:pre [(string? request-url) (not (nil? callback))]}
(callback (try
(do (.importScripts js/self (add-cache-buster request-url))
true)
(catch js/Error e
(glog/error logger (str "Figwheel: Error loading file " request-url))
(glog/error logger e)
false))))
(defn ^:export create-node-script-import-fn []
(let [node-path-lib (js/require "path")
;; just finding a file that is in the cache so we can
;; figure out where we are
util-pattern (str (.-sep node-path-lib)
(.join node-path-lib "goog" "bootstrap" "nodejs.js"))
util-path (gobj/findKey js/require.cache (fn [v k o] (gstring/endsWith k util-pattern)))
parts (-> (string/split util-path #"[/\\]") pop pop)
root-path (string/join (.-sep node-path-lib) parts)]
(fn [request-url callback]
(assert (string? request-url) (not (nil? callback)))
(let [cache-path (.resolve node-path-lib root-path request-url)]
(gobj/remove (.-cache js/require) cache-path)
(callback (try
(js/require cache-path)
(catch js/Error e
(glog/error logger (str "Figwheel: Error loading file " cache-path))
(glog/error logger e)
false)))))))
(def host-env
(cond
(not (nil? goog/nodeGlobalRequire)) :node
(not (nil? goog/global.document)) :html
(and (exists? goog/global.navigator)
(= goog/global.navigator.product "ReactNative"))
:react-native
(and
(nil? goog/global.document)
(exists? js/self)
(exists? (.-importScripts js/self)))
:worker))
(def reload-file*
(condp = host-env
:node (create-node-script-import-fn)
:html write-script-tag-import
:worker worker-import-script
(fn [a b] (throw "Reload not defined for this platform"))))
;; TODO Should just leverage the import script here somehow
(defn reload-file [{:keys [request-url] :as file-msg} callback]
{:pre [(string? request-url) (not (nil? callback))]}
(glog/fine logger (str "Attempting to load " request-url))
((or (gobj/get goog.global "FIGWHEEL_IMPORT_SCRIPT") reload-file*)
request-url
(fn [success?]
(if success?
(do
(glog/fine logger (str "Successfully loaded " request-url))
(apply callback [(assoc file-msg :loaded-file true)]))
(do
(glog/error logger (str "Error loading file " request-url))
(apply callback [file-msg]))))))
;; for goog.require consumption
(defonce reload-promise-chain (atom (Promise. #(%1 true))))
(defn queued-file-reload
([url] (queued-file-reload url nil))
([url opt-source-text]
(when-let [next-promise-fn
(cond opt-source-text
#(.then %
(fn [_]
(Promise.
(fn [r _]
(try (js/eval opt-source-text)
(catch js/Error e
(glog/error logger e)))
(r true)))))
url
#(.then %
(fn [_]
(Promise.
(fn [r _]
(reload-file {:request-url url}
(fn [file-msg]
(r true))))))))]
(swap! reload-promise-chain next-promise-fn))))
(defn ^:export after-reloads [f]
(swap! reload-promise-chain #(.then % f)))
;; --------------------------------------------------------------
;; REPL print forwarding
;; --------------------------------------------------------------
(goog-define print-output "console,repl")
(defn print-receivers [outputs]
(->> (string/split outputs #",")
(map string/trim)
(filter (complement string/blank?))
(map keyword)
set))
(defmulti out-print (fn [k args] k))
(defmethod out-print :console [_ args]
(.apply (.-log js/console) js/console (garray/clone (to-array args))))
(defmulti err-print (fn [k args] k))
(defmethod err-print :console [_ args]
(.apply (.-error js/console) js/console (garray/clone (to-array args))))
(defn setup-printing! []
(let [printers (print-receivers print-output)]
(set-print-fn! (fn [& args] (doseq [p printers] (out-print p args))))
(set-print-err-fn! (fn [& args] (doseq [p printers] (err-print p args))))))
#_ (printing-receivers "console,repl")
;; --------------------------------------------------------------
;; Websocket REPL
;; --------------------------------------------------------------
(goog-define connect-url "ws://[[client-hostname]]:[[client-port]]/figwheel-connect")
(def state (atom {}))
;; returns nil if not available
(def storage (storage-factory/createHTML5SessionStorage "figwheel.repl"))
(defn set-state [k v]
(swap! state assoc k v)
(when storage (.set storage (str k) v)))
(defn get-state [k]
(if storage (.get storage (str k)) (get @state k)))
(defn ^:export session-name [] (get-state ::session-name))
(defn ^:export session-id [] (get-state ::session-id))
(defn response-for [{:keys [uuid]} response-body]
(cond->
{:session-id (session-id)
:session-name (session-name)
:response response-body}
uuid (assoc :uuid uuid)))
;; this is a fire and forget POST
(def http-post
(condp = host-env
:node
(let [http (js/require "http")]
(fn [url post-data]
(let [data (volatile! "")
uri (guri/parse (str url))]
(-> (.request http
#js {:host (.getDomain uri)
:port (.getPort uri)
:path (str (.getPath uri) (when-let [q (.getQuery uri)]
(str "?" q)))
:method "POST"
:headers #js {"Content-Length" (js/Buffer.byteLength post-data)}}
(fn [x]))
(.on "error" #(js/console.error %))
(doto
(.write post-data)
(.end))))))
(fn [url response]
(xhrio/send url
(fn [e] (debug "Response Posted"))
"POST"
response))))
(defn respond-to [{:keys [websocket http-url] :as old-msg} response-body]
(let [response (response-for old-msg response-body)]
(cond
websocket
(.send websocket (pr-str response))
http-url
(http-post http-url (pr-str response)))))
(defn respond-to-connection [response-body]
(respond-to (:connection @state) response-body))
(defmulti message :op)
(defmethod message "naming" [msg]
(when-let [sn (:session-name msg)] (set-state ::session-name sn))
(when-let [sid (:session-id msg)] (set-state ::session-id sid))
(glog/info logger (str "Session ID: " (session-id)))
(glog/info logger (str "Session Name: " (session-name))))
(defmethod message "ping" [msg] (respond-to msg {:pong true}))
(let [ua-product-fn
;; TODO make sure this works on other platforms
#(cond
(not (nil? goog/nodeGlobalRequire)) :chrome
product/SAFARI :safari
product/CHROME :chrome
product/FIREFOX :firefox
product/IE :ie)
print-to-console? ((print-receivers print-output) :console)]
(defn eval-javascript** [code]
(let [ua-product (ua-product-fn)]
(try
(let [sb (js/goog.string.StringBuffer.)]
;; TODO capture err as well?
(binding [cljs.core/*print-newline* true
cljs.core/*print-fn* (fn [x] (.append sb x))]
(let [result-value (js/eval code)
;; the result needs to be readable
result-value (if-not (string? result-value)
(pr-str result-value)
result-value)
output-str (str sb)]
(when (and print-to-console? (not (zero? (.getLength sb))))
(js/setTimeout #(out-print :console [output-str]) 0))
{:status :success
:out output-str
:ua-product ua-product
:value result-value})))
(catch js/Error e
;; logging errors to console helpful
(when (and (exists? js/console) (exists? js/console.error))
(js/console.error "REPL eval error" e))
{:status :exception
:value (pr-str e)
:ua-product ua-product
:stacktrace (.-stack e)})
(catch :default e
{:status :exception
:ua-product ua-product
:value (pr-str e)
:stacktrace "No stacktrace available."})))))
(defmethod message "eval" [{:keys [code] :as msg}]
(let [result (eval-javascript** code)]
(respond-to msg result)))
(defmethod message "messages" [{:keys [messages http-url]}]
(doseq [msg messages]
(message (cond-> (js->clj msg :keywordize-keys true)
http-url (assoc :http-url http-url)))))
(defn fill-url-template [connect-url']
(if (= host-env :html)
(-> connect-url'
(string/replace "[[client-hostname]]" js/location.hostname)
(string/replace "[[client-port]]" js/location.port))
connect-url'))
(defn make-url [connect-url']
(let [uri (guri/parse (fill-url-template (or connect-url' connect-url)))]
(cond-> (.add (.getQueryData uri) "fwsid" (or (session-id) (random-uuid)))
(session-name) (.add "fwsname" (session-name)))
uri))
(defn exponential-backoff [attempt]
(* 1000 (min (js/Math.pow 2 attempt) 20)))
(defn hook-repl-printing-output! [respond-msg]
(defmethod out-print :repl [_ args]
(respond-to respond-msg
{:output true
:stream :out
:args (mapv #(if (string? %) % (gjson/serialize %)) args)}))
(defmethod err-print :repl [_ args]
(respond-to respond-msg
{:output true
:stream :err
:args (mapv #(if (string? %) % (gjson/serialize %)) args)}))
(setup-printing!))
(defn connection-established! [url]
(when (= host-env :html)
(let [target (.. goog.global -document -body)]
(.dispatchEvent
target
(doto (js/Event. "figwheel.repl.connected" target)
(gobj/add "data" {:url url}))))))
(defn connection-closed! [url]
(when (= host-env :html)
(let [target (.. goog.global -document -body)]
(.dispatchEvent
target
(doto (js/Event. "figwheel.repl.disconnected" target)
(gobj/add "data" {:url url}))))))
(defn get-websocket-class []
(or
(gobj/get goog.global "WebSocket")
(gobj/get goog.global "FIGWHEEL_WEBSOCKET_CLASS")
(and (= host-env :node)
(try (js/require "ws")
(catch js/Error e
nil)))
(and (= host-env :worker)
(gobj/get js/self "WebSocket"))))
(defn ensure-websocket [thunk]
(if (gobj/get goog.global "WebSocket")
(thunk)
(if-let [websocket-class (get-websocket-class)]
(do
(gobj/set goog.global "WebSocket" websocket-class)
(thunk)
(gobj/set goog.global "WebSocket" nil))
(do
(glog/error
logger
(if (= host-env :node)
"Can't connect!! Please make sure ws is installed\n do -> 'npm install ws'"
"Can't connect!! This client doesn't support WebSockets"))))))
(defn ws-connect [& [websocket-url']]
(ensure-websocket
#(let [websocket (goog.net.WebSocket.)
url (str (make-url websocket-url'))]
(try
(doto websocket
(.addEventListener goog.net.WebSocket.EventType.MESSAGE
(fn [e]
(when-let [msg (gobj/get e "message")]
(try
(debug msg)
(message (assoc
(js->clj (js/JSON.parse msg) :keywordize-keys true)
:websocket websocket))
(catch js/Error e
(glog/error logger e))))))
(.addEventListener goog.net.WebSocket.EventType.OPENED
(fn [e]
(connection-established! url)
(swap! state assoc :connection {:websocket websocket})
(hook-repl-printing-output! {:websocket websocket})))
(.addEventListener goog.net.WebSocket.EventType.CLOSED
(fn [e] (connection-closed! url)))
(.open url))))))
;; -----------------------------------------------------------
;; HTTP simple and long polling
;; -----------------------------------------------------------
(def http-get
(condp = host-env
:node
(let [http (js/require "http")]
(fn [url]
(Promise.
(fn [succ err]
(let [data (volatile! "")]
(-> (.get http (str url)
(fn [response]
(.on response "data"
(fn [chunk] (vswap! data str chunk)))
(.on response "end" #(succ
(try (js/JSON.parse @data)
(catch js/Error e
(js/console.error e)
(err e)))))))
(.on "error" err)))))))
(fn [url]
(Promise.
(fn [succ err]
(xhrio/send
url
(fn [e]
(let [xhr (gobj/get e "target")]
(if (.isSuccess xhr)
(succ (.getResponseJson xhr))
(err xhr))))))))))
(declare http-connect http-connect*)
(defn poll [msg-fn connect-url']
(.then (http-get (make-url connect-url'))
(fn [msg]
(msg-fn msg)
(js/setTimeout #(poll msg-fn connect-url') 500))
(fn [e] ;; lost connection
(connection-closed! connect-url')
(http-connect connect-url'))))
(defn long-poll [msg-fn connect-url']
(.then (http-get (make-url connect-url'))
(fn [msg]
(msg-fn msg)
(long-poll msg-fn connect-url'))
(fn [e] ;; lost connection
(connection-closed! connect-url')
(http-connect connect-url'))))
(defn http-connect* [attempt connect-url']
(let [url (make-url connect-url')
surl (str url)
msg-fn (fn [msg]
(try
(debug (pr-str msg))
(message (assoc (js->clj msg :keywordize-keys true)
:http-url surl))
(catch js/Error e
(glog/error logger e))))]
(doto (.getQueryData url)
(.add "fwinit" "true"))
(.then (http-get url)
(fn [msg]
(let [typ (gobj/get msg "connection-type")]
(glog/info logger (str "Connected: " typ))
(msg-fn msg)
(connection-established! url)
;; after connecting setup printing redirects
(swap! state assoc :connection {:http-url surl})
(hook-repl-printing-output! {:http-url surl})
(if (= typ "http-long-polling")
(long-poll msg-fn connect-url')
(poll msg-fn connect-url'))))
(fn [e];; didn't connect
(when (instance? js/Error e)
(glog/error logger e))
(when (and (instance? goog.net.XhrIo e) (.getResponseBody e))
(debug (.getResponseBody e)))
(let [wait-time (exponential-backoff attempt)]
(glog/info logger (str "HTTP Connection Error: next connection attempt in " (/ wait-time 1000) " seconds"))
(js/setTimeout #(http-connect* (inc attempt) connect-url')
wait-time))))))
(defn http-connect [& [connect-url']]
(http-connect* 0 connect-url'))
(defn switch-to-http? [url]
(if (or (gstring/startsWith url "http")
(get-websocket-class))
url
(do
(glog/warning
logger
(str
"No WebSocket implementation found! Falling back to http-long-polling"
(when (= host-env :node)
":\n For a more efficient connection ensure that \"ws\" is installed :: do -> 'npm install ws'")))
(-> (guri/parse url)
(.setScheme "http")
str))))
(goog-define client-log-level "info")
(def log-levels
(into {}
(map (juxt
string/lower-case
#(gobj/get goog.debug.Logger.Level %))
(map str '(SEVERE WARNING INFO CONFIG FINE FINER FINEST)))))
(defn set-log-level [logger' level]
(if-let [lvl (get log-levels level)]
(do
(.setLevel logger' lvl)
(debug (str "setting log level to " level)))
(glog/warn (str "Log level " (pr-str level) " doesn't exist must be one of "
(pr-str '("severe" "warning" "info" "config" "fine" "finer" "finest"))))))
(defn init-log-level! []
(doseq [logger' (cond-> [logger]
(exists? js/figwheel.core)
(conj js/figwheel.core.logger))]
(set-log-level logger' client-log-level)))
(defn connect* [connect-url']
(init-log-level!)
(patch-goog-base)
(let [url (switch-to-http? (string/trim (or connect-url' connect-url)))]
(cond
(gstring/startsWith url "ws") (ws-connect url)
(gstring/startsWith url "http") (http-connect url))))
(defn connect [& [connect-url']]
(defonce connected
(do (connect* connect-url') true))))
)
;; end :cljs
#?(:clj (do
(defonce ^:private listener-set (atom #{}))
(defn add-listener [f] (swap! listener-set conj f) nil)
(defn remove-listener [f] (swap! listener-set disj f) nil)
(declare name-list)
(defn log [& args]
(spit "server.log" (apply prn-str args) :append true))
(defonce scratch (atom {}))
(def ^:dynamic *server* nil)
(defn parse-query-string [qs]
(when (string? qs)
(into {} (for [[_ k v] (re-seq #"([^&=]+)=([^&]+)" qs)]
[(keyword k) (java.net.URLDecoder/decode v)]))))
;; ------------------------------------------------------------------
;; Connection management
;; ------------------------------------------------------------------
(defonce ^:dynamic *connections* (atom {}))
(defn taken-names [connections]
(set (mapv :session-name (vals connections))))
(defn available-names [connections]
(set/difference name-list (taken-names connections)))
(defn negotiate-id [ring-request connections]
(let [query (parse-query-string (:query-string ring-request))
sid (:fwsid query (str (java.util.UUID/randomUUID)))
sname (or (some-> connections (get sid) :session-name)
(when-let [chosen-name (:fwsname query)]
(when-not ((taken-names connections) chosen-name)
chosen-name))
(rand-nth (seq (available-names connections))))]
[sid sname]))
(defn create-connection! [ring-request options]
(let [[sess-id sess-name] (negotiate-id ring-request @*connections*)
conn (merge (select-keys ring-request [:server-port :scheme :uri :server-name :query-string :request-method])
(cond-> {:session-name sess-name
:session-id sess-id
::alive-at (System/currentTimeMillis)
:created-at (System/currentTimeMillis)}
(:query-string ring-request)
(assoc :query (parse-query-string (:query-string ring-request))))
options)]
(swap! *connections* assoc sess-id conn)
conn))
(defn remove-connection! [{:keys [session-id] :as conn}]
(swap! *connections* dissoc session-id))
(defn receive-message! [data]
(when-let [data
(try
(edn/read-string data)
(catch Throwable t
(binding [*out* *err*] (clojure.pprint/pprint (Throwable->map t)))))]
(doseq [f @listener-set]
(try (f data) (catch Throwable ex)))))
(defn naming-response [{:keys [session-name session-id type] :as conn}]
(json/write-str {:op :naming
:session-name session-name
:session-id session-id
:connection-type type}))
;; ------------------------------------------------------------------
;; Websocket behavior
;; ------------------------------------------------------------------
(defn abstract-websocket-connection [connections]
(let [conn (volatile! nil)]
{:on-connect (fn [{:keys [request send-fn close-fn is-open-fn]
:as connect-data}]
;; TODO remove dev only
(swap! scratch assoc :ring-request request)
(binding [*connections* connections]
(let [conn' (create-connection!
request
{:type :websocket
:is-open-fn is-open-fn
:close-fn close-fn
:send-fn (fn [_ data]
(send-fn data))})]
(vreset! conn conn')
(send-fn (naming-response conn')))))
:on-close (fn [status] (binding [*connections* connections]
(remove-connection! @conn)))
:on-receive (fn [data] (binding [*connections* connections]
(receive-message! data)))}))
;; ------------------------------------------------------------------
;; http polling
;; ------------------------------------------------------------------
(defn json-response [json-body]
{:status 200
:headers {"Content-Type" "application/json"}
:body json-body})
(defn http-polling-send [conn data]
(swap! (::comm-atom conn) update :messages (fnil conj []) data))
(defn http-polling-connect [ring-request]
(let [{:keys [fwsid fwinit]} (-> ring-request :query-string parse-query-string)]
;; new connection create the connection
(cond
(not (get @*connections* fwsid))
(let [conn (create-connection! ring-request
{:type :http-polling
::comm-atom (atom {})
:is-open-fn (fn [conn]
(< (- (System/currentTimeMillis)
(::alive-at conn))
3000))
:send-fn http-polling-send})]
(json-response (naming-response conn)))
fwinit
(let [conn (get @*connections* fwsid)]
(swap! *connections* assoc-in [fwsid :created-at] (System/currentTimeMillis))
(json-response (naming-response conn)))
:else
;; otherwise we are polling
(let [messages (volatile! [])
comm-atom (get-in @*connections* [fwsid ::comm-atom])]
(swap! *connections* assoc-in [fwsid ::alive-at] (System/currentTimeMillis))
(swap! comm-atom update :messages (fn [msgs] (vreset! messages (or msgs [])) []))
(json-response
(json/write-str {:op :messages
:messages (mapv json/read-json @messages)
:connection-type :http-polling}))))))
(defn http-polling-endpoint [ring-request]
(condp = (:request-method ring-request)
:get (http-polling-connect ring-request)
:post (do (receive-message! (slurp (:body ring-request)))
{:status 200
:headers {"Content-Type" "text/html"}
:body "Received"})))
;; simple http polling can be included in any ring middleware stack
(defn http-polling-middleware [handler path connections]
(fn [ring-request]
(if-not (.startsWith (:uri ring-request) path)
(handler ring-request)
(binding [*connections* connections]
(http-polling-endpoint ring-request)))))
;; ------------------------------------------------------------------
;; http async polling - long polling
;; ------------------------------------------------------------------
;; long polling is a bit complex - but this currently appears to work
;; as well as websockets in terms of connectivity, it is slower and heavier
;; overall and much harder to determine when it is closed
(declare send-for-response)
(defn ping [conn] (send-for-response [conn] {:op :ping}))
;; could make no-response behavior configurable
(defn ping-thread [connections fwsid {:keys [interval
ping-timeout]
:or {interval 15000
ping-timeout 2000}}]
(doto (Thread.
(fn []
(loop []
(Thread/sleep interval)
(when-let [conn (get @connections fwsid)]
(if-not (try
;; TODO consider re-trying a couple times on failure
(deref (ping conn) ping-timeout false)
(catch Throwable e
false))
(swap! connections dissoc fwsid)
(recur))))))
(.setDaemon true)
(.start)))
;; agents would be easier but heavier and agent clean up is harder
(defn long-poll-send [comm-atom msg]
(let [data (volatile! nil)
add-message #(if-not msg % (update % :messages (fnil conj []) msg))]
(swap! comm-atom
(fn [{:keys [respond messages] :as comm}]
(if (and respond (or (not-empty messages) msg))
(do (vreset! data (add-message comm)) {})
(add-message comm))))
(when-let [{:keys [respond messages]} @data]
;; when this fails?
(respond
(json-response
(json/write-str {:op :messages
:messages (mapv json/read-json messages)
:connection-type :http-long-polling}))))))
(defn long-poll-capture-respond [comm-atom respond]
(let [has-messages (volatile! false)]
(swap! comm-atom (fn [{:keys [messages] :as comm}]
(vreset! has-messages (not (empty? messages)))
(assoc comm :respond respond)))
(when @has-messages (long-poll-send comm-atom nil))))
;; may turn this into a multi method
(defn connection-send [{:keys [send-fn] :as conn} data]
(send-fn conn data))
(defn send-for-response* [prom conn msg]
(let [uuid (str (java.util.UUID/randomUUID))
listener (fn listen [msg]
(when (= uuid (:uuid msg))
(when-let [result (:response msg)]
(deliver prom
(if (instance? clojure.lang.IMeta result)
(vary-meta result assoc ::message msg)
result)))
(remove-listener listen)))]
(add-listener listener)
(try
(connection-send
conn
(json/write-str
(-> (select-keys conn [:session-id :session-name])
(merge msg)
(assoc :uuid uuid))))
(catch Throwable t
(remove-listener listener)
(throw t)))))
(def no-connection-result
(vary-meta
{:status :exception
:value "Expected REPL Connections Evaporated!"
:stacktrace "No stacktrace available."}
assoc ::no-connection-made true))
(defn broadcast-for-response [connections msg]
(let [prom (promise)
cnt (->> connections
(mapv #(try
(send-for-response* prom % msg)
true
(catch Throwable t
nil)))
(filter some?)
count)]
(when (zero? cnt)
(deliver prom no-connection-result))
prom))
(defn send-for-response [connections msg]
(let [prom (promise)
sent (loop [[conn & xc] connections]
(when conn
(if-not (try
(send-for-response* prom conn msg)
true
(catch Throwable t
false))
(recur xc)
true)))]
(when-not sent
(deliver prom no-connection-result))
prom))
(defn http-long-polling-connect [ring-request respond raise]
(let [{:keys [fwsid fwinit]} (-> ring-request :query-string parse-query-string)]
(if (not (get @*connections* fwsid))
(let [conn (create-connection!
ring-request
{:type :http-long-polling
::comm-atom (atom {:messages []})
:is-open-fn (fn [conn]
(not (> (- (System/currentTimeMillis)
(::alive-at conn))
20000)))
:send-fn (fn [conn msg]
(long-poll-send (::comm-atom conn) msg))})]
(respond (json-response (naming-response conn)))
;; keep alive with ping thread
;; This behavior is much more subtle that it appears, it is far better
;; than webserver triggered async timeout because it doesn't
;; leave behind an orphaned respond-fn
;; also it helps us remove lost connections, as I haven't found
;; a way to discover if an HTTPChannel is closed on the remote endpoint
;; TODO a short ping-timeout could be a problem if an
;; env has a long running eval
;; this could reuse the eval timeout
(ping-thread *connections* fwsid {:interval 15000 :ping-timeout 2000}))
(let [conn (get @*connections* fwsid)]
(if fwinit
(do
(respond (json-response (naming-response conn)))
(swap! *connections* assoc-in [fwsid :created-at] (System/currentTimeMillis)))
(do
(long-poll-capture-respond (::comm-atom conn) respond)
(swap! *connections* assoc-in [fwsid ::alive-at] (System/currentTimeMillis))))))))
(defn http-long-polling-endpoint [ring-request send raise]
(condp = (:request-method ring-request)
:get (http-long-polling-connect ring-request send raise)
:post (do (receive-message! (slurp (:body ring-request)))
(send {:status 200
:headers {"Content-Type" "text/html"}
:body "Received"}))))
(defn asyc-http-polling-middleware [handler path connections]
(fn [ring-request send raise]
(swap! scratch assoc :async-request ring-request)
(if-not (.startsWith (:uri ring-request) path)
(handler ring-request send raise)
(binding [*connections* connections]
(try
(http-long-polling-endpoint ring-request send raise)
(catch Throwable e
(raise e)))))))
;; ---------------------------------------------------
;; ReplEnv implmentation
;; ---------------------------------------------------
(defn open-connections []
(filter (fn [{:keys [is-open-fn] :as conn}]
(try (or (nil? is-open-fn) (is-open-fn conn))
(catch Throwable t
false)))
(vals @*connections*)))
(defn connections-available [repl-env]
(sort-by
:created-at >
(filter (or (some-> repl-env :connection-filter)
identity)
(open-connections))))
(defn wait-for-connection [repl-env]
(loop []
(when (empty? (connections-available repl-env))
(Thread/sleep 500)
(recur))))
(defn send-for-eval [{:keys [focus-session-name ;; just here for consideration
broadcast] :as repl-env} connections js]
(if broadcast
(broadcast-for-response connections {:op :eval :code js})
(send-for-response connections {:op :eval :code js})))
(defn eval-connections [{:keys [focus-session-name] :as repl-env}]
(let [connections (connections-available repl-env)
;; session focus
connections (if-let [focus-conn
(and @focus-session-name
(first (filter (fn [{:keys [session-name]}]
(= @focus-session-name
session-name))
connections)))]
[focus-conn]
(do
(reset! focus-session-name nil)
connections))]
connections))
(defn trim-last-newline [args]