@andrew_l/service-actor/dist/index.cjs

Forget about passing data like trace IDs between functions.

'use strict';

const context = require('@andrew_l/context');
const toolkit = require('@andrew_l/toolkit');

const SYM_MARKER = Symbol();
const SYM_RAW = Symbol();
const SYM_DATA = Symbol();
const SYM_API = Symbol();
function serviceActor(factory) {
  const injectKey = Symbol();
  let idSeq = 0;
  const createActor = () => {
    const actor = createServiceActor();
    actor.traceId = `trace-${++idSeq}`;
    if (factory) {
      actor.assign(factory());
    }
    return actor;
  };
  const withHook = (fn, params) => {
    return context.withContext(function(...args) {
      const parentActor = context.inject(injectKey);
      const actor = createActor();
      if (parentActor) {
        actor.assign(parentActor);
      }
      if (params) {
        actor.assign(params);
      }
      context.provide(injectKey, actor);
      return fn.apply(this, args);
    });
  };
  const injectHook = () => {
    return context.hasInjectionContext() ? context.inject(injectKey) : void 0;
  };
  const useHok = () => {
    if (!context.hasInjectionContext()) {
      const actor2 = createActor();
      context.provide(injectKey, actor2, true);
      return actor2;
    }
    const existed = context.inject(injectKey);
    if (existed) return existed;
    const actor = createActor();
    context.provide(injectKey, actor);
    return actor;
  };
  return { with: withHook, use: useHok, inject: injectHook };
}
function createServiceActor() {
  const actor = {
    traceId: "",
    actorId: null,
    actorType: "unknown",
    [SYM_API]: {
      assign
    },
    [SYM_DATA]: {},
    [SYM_RAW]: null,
    [SYM_MARKER]: true
  };
  const reservedKeys = new Set(Object.keys(actor));
  actor[SYM_RAW] = actor;
  const newProxy = new Proxy(actor[SYM_DATA], {
    defineProperty(target, key, value) {
      if (key in actor) {
        actor[key] = value;
      } else {
        target[key] = value;
      }
      return true;
    },
    deleteProperty(target, key) {
      if (key in actor) {
        delete actor[key];
      } else {
        delete target[key];
      }
      return true;
    },
    has(target, key) {
      return key in actor || key in target;
    },
    ownKeys(target) {
      return [...reservedKeys, ...Object.keys(target)];
    },
    set: function(target, key, value) {
      if (key in actor[SYM_API]) return false;
      if (key in actor) {
        Reflect.set(actor, key, value);
      } else if (toolkit.isFunction(value)) {
        Reflect.set(actor[SYM_API], key, value);
      } else {
        Reflect.set(target, key, value);
      }
      return true;
    },
    get: (target, key) => {
      let value;
      if (key in actor) {
        value = Reflect.get(actor, key, value);
      } else if (key in actor[SYM_API]) {
        value = Reflect.get(actor[SYM_API], key, value).bind(newProxy);
      } else {
        value = Reflect.get(target, key);
      }
      return value;
    },
    getOwnPropertyDescriptor(k) {
      return {
        enumerable: true,
        configurable: true
      };
    }
  });
  return newProxy;
}
function assign(params) {
  Object.assign(this, params);
  return this;
}

exports.serviceActor = serviceActor;
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