packet_serialization.clj

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Branches > main > e990856 > files / src / net / bowmap / server / protocol / packet_serialization.clj

(ns net.bowmap.server.protocol.packet-serialization
  (:require
   [net.bowmap.server.protocol.clientbound-packets :as clientbound]
   [net.bowmap.server.protocol.frame :refer [frame]]
   [net.bowmap.server.protocol.packet :as packet]
   [net.bowmap.server.protocol.phase :as phase]
   [net.bowmap.server.protocol.readers :as readers]
   [net.bowmap.server.protocol.serverbound-packets :as serverbound]
   [net.bowmap.server.protocol.writers :as writers]))

(defn encode-packet
  "Encodes a packet into a frame.
   Throws when the packet cannot be encoded."
  [{::phase/keys! [phase]} {::packet/keys! [id] :as packet}]
  (let [numeric-id (req! (clientbound/phase->id->numeric-id phase) id)
        writer (req! (clientbound/phase->id->writer phase) id)]
    (-> (frame)
        (writers/varint> numeric-id)
        (writer packet))))

(defn decode-frame
  "Decodes a packet from a frame.
   Can throw if the frame does not contain a valid packet."
  [{:keys! [::phase/phase]} frame]
  (let [numeric-id (readers/varint< frame)
        id (req! (serverbound/phase->numeric-id->id phase) numeric-id)
        reader (req! (serverbound/phase->id->reader phase) id)]
    (assoc (reader frame)
           ::packet/id id)))