@ecmaservegames/host/src/performAction.js

A host server for a game.

const { loadActionResponseAsync } = require('./loadProtobufAsync')
const { __applyMechanicsToState } = require('./mechanics')
const debug = require('./debug')

async function createActionResponse(
  accepted,
  ruleResults,
  ActionsDefinition,
  originalBuffer
) {
  const ActionResponse = await loadActionResponseAsync()
  const message = ActionResponse.create({
    accepted,
    ruleResults,
    action: {
      type_url: ActionsDefinition.toString(),
      value: originalBuffer,
    },
  })
  return ActionResponse.encode(message).finish()
}

async function performAction(
  binary,
  { Game, RulesPipeline, ActionsDefinition, StateDefinition, Mechanics, User }
) {
  const stateBuffer = await Game.getStateBuffer()
  let state = StateDefinition.decode(stateBuffer)
  const Actions = ActionsDefinition.decode(binary)
  /// Run Rules
  const rules = await RulesPipeline.run(Actions, state, User)
  const accepted = rules.ruleResults.every((r) => r.result)

  if (accepted) {
    state = await __applyMechanicsToState(Actions, state, Mechanics, User)
    // Run the rule specific mutations
    state = await rules.performMutations(state)

    await Game.commit(StateDefinition.encode(state).finish())
  }
  if (!accepted) {
    debug(rules.ruleResults)
  }
  return [accepted, rules.ruleResults]
}

module.exports = {
  performAction,
  createActionResponse,
}