Javascript 云函数中的firebase分布式计数器扩展

我试图在云函数中实现Firebase的分布式计数器扩展。其思想是检测何时创建文档，然后在文档中添加一个计数器。以下是我的云功能：

exports.bookmark_increment = functions.firestore.document('questions/{question_id}/bookmarks/{user_uid}')
  .onCreate(async (snap, context) => {

    // compiled client sample code for increment counter
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o(t.value) : new r(function(e) { e(t.value) }).then(s, u) } a((n = n.apply(t, e || [])).next()) }) }, o = this && this.__generator || function(t, e) { var r, n, o, i, s = { label: 0, sent: function() { if (1 & o[0]) throw o[1]; return o[1] }, trys: [], ops: [] }; return i = { next: u(0), throw: u(1), return: u(2) }, "function" == typeof Symbol && (i[Symbol.iterator] = function() { return this }), i; function u(i) { return function(u) { return function(i) { if (r) throw new TypeError("Generator is already executing."); for (; s;)try { if (r = 1, n && (o = 2 & i[0] ? n.return : i[0] ? n.throw || ((o = n.return) && o.call(n), 0) : n.next) && !(o = o.call(n, i[1])).done) return o; switch (n = 0, o && (i = [2 & i[0], o.value]), i[0]) { case 0: case 1: o = i; break; case 4: return s.label++, { value: i[1], done: !1 }; case 5: s.label++, n = i[1], i = [0]; continue; case 7: i = s.ops.pop(), s.trys.pop(); continue; default: if (!(o = (o = s.trys).length > 0 && o[o.length - 1]) && (6 === i[0] || 2 === i[0])) { s = 0; continue } if (3 === i[0] && (!o || i[1] > o[0] && i[1] < o[3])) { s.label = i[1]; break } if (6 === i[0] && s.label < o[1]) { s.label = o[1], o = i; break } if (o && s.label < o[2]) { s.label = o[2], s.ops.push(i); break } o[2] && s.ops.pop(), s.trys.pop(); continue }i = e.call(t, s) } catch (t) { i = [6, t], n = 0 } finally { r = o = 0 } if (5 & i[0]) throw i[1]; return { value: i[0] ? i[1] : void 0, done: !0 } }([i, u]) } } }; Object.defineProperty(e, "__esModule", { value: !0 }); var i = r(3), s = "_counter_shards_", u = "FIRESTORE_COUNTER_SHARD_ID", a = function() { function t(t, e) { this.doc = t, this.field = e, this.db = null, this.shardId = "", this.shards = {}, this.notifyPromise = null, this.db = t.firestore, this.shardId = function(t) { var e = new RegExp("(?:^|; )" + encodeURIComponent(t) + "=([^;]*)").exec(document.cookie); if (e) return e[1]; var r = i.v4(), n = new Date; n.setTime(n.getTime() + 2592e6); var o = "; expires=" + n.toUTCString(); return document.cookie = encodeURIComponent(t) + "=" + r + o + "; path=/", r }(u); var r = t.collection(s); this.shards[t.path] = 0, this.shards[r.doc(this.shardId).path] = 0, this.shards[r.doc("\t" + this.shardId.substr(0, 4)).path] = 0, this.shards[r.doc("\t\t" + this.shardId.substr(0, 3)).path] = 0, this.shards[r.doc("\t\t\t" + this.shardId.substr(0, 2)).path] = 0, this.shards[r.doc("\t\t\t\t" + this.shardId.substr(0, 1)).path] = 0 } return t.prototype.get = function(t) { return n(this, void 0, void 0, function() { var e, r = this; return o(this, function(i) { switch (i.label) { case 0: return e = Object.keys(this.shards).map(function(e) { return n(r, void 0, void 0, function() { return o(this, function(r) { switch (r.label) { case 0: return [4, this.db.doc(e).get(t)]; case 1: return [2, r.sent().get(this.field) || 0] } }) }) }), [4, Promise.all(e)]; case 1: return [2, i.sent().reduce(function(t, e) { return t + e }, 0)] } }) }) }, t.prototype.onSnapshot = function(t) { var e = this; Object.keys(this.shards).forEach(function(r) { e.db.doc(r).onSnapshot(function(r) { e.shards[r.ref.path] = r.get(e.field) || 0, null === e.notifyPromise && (e.notifyPromise = function(t) { return n(this, void 0, void 0, function() { var e = this; return o(this, function(r) { return [2, new Promise(function(r) { return n(e, void 0, void 0, function() { var e = this; return o(this, function(i) { return setTimeout(function() { return n(e, void 0, void 0, function() { var e; return o(this, function(n) { return e = t(), r(e), [2] }) }) }, 0), [2] }) }) })] }) }) }(function() { var r = Object.values(e.shards).reduce(function(t, e) { return t + e }, 0); t({ exists: !0, data: function() { return r } }), e.notifyPromise = null })) }) }) }, t.prototype.incrementBy = function(t) { var e = firebase.firestore.FieldValue.increment(t), r = this.field.split(".").reverse().reduce(function(t, e) { var r; return (r = {})[e] = t, r }, e); return this.doc.collection(s).doc(this.shardId).set(r, { merge: !0 }) }, t.prototype.shard = function() { return this.doc.collection(s).doc(this.shardId) }, t }(); e.Counter = a }, function(t, e, r) { var n = r(4), o = r(5), i = o; i.v1 = n, i.v4 = o, t.exports = i }, function(t, e, r) { var n, o, i = r(0), s = r(1), u = 0, a = 0; t.exports = function(t, e, r) { var c = e && r || 0, f = e || [], d = (t = t || {}).node || n, l = void 0 !== t.clockseq ? t.clockseq : o; if (null == d || null == l) { var h = i(); null == d && (d = n = [1 | h[0], h[1], h[2], h[3], h[4], h[5]]), null == l && (l = o = 16383 & (h[6] << 8 | h[7])) } var p = void 0 !== t.msecs ? t.msecs : (new Date).getTime(), v = void 0 !== t.nsecs ? t.nsecs : a + 1, y = p - u + (v - a) / 1e4; if (y < 0 && void 0 === t.clockseq && (l = l + 1 & 16383), (y < 0 || p > u) && void 0 === t.nsecs && (v = 0), v >= 1e4) throw new Error("uuid.v1(): Can't create more than 10M uuids/sec"); u = p, a = v, o = l; var b = (1e4 * (268435455 & (p += 122192928e5)) + v) % 4294967296; f[c++] = b >>> 24 & 255, f[c++] = b >>> 16 & 255, f[c++] = b >>> 8 & 255, f[c++] = 255 & b; var m = p / 4294967296 * 1e4 & 268435455; f[c++] = m >>> 8 & 255, f[c++] = 255 & m, f[c++] = m >>> 24 & 15 | 16, f[c++] = m >>> 16 & 255, f[c++] = l >>> 8 | 128, f[c++] = 255 & l; for (var g = 0; g < 6; ++g)f[c + g] = d[g]; return e || s(f) } }, function(t, e, r) { var n = r(0), o = r(1); t.exports = function(t, e, r) { var i = e && r || 0; "string" == typeof t && (e = "binary" === t ? new Array(16) : null, t = null); var s = (t = t || {}).random || (t.rng || n)(); if (s[6] = 15 & s[6] | 64, s[8] = 63 & s[8] | 128, e) for (var u = 0; u < 16; ++u)e[i + u] = s[u]; return e || o(s) } }]);
    
    const question_ref = db.collection('questions').doc(context.params.question_id);
    
    // Initialize the sharded counter.
    var bookmarks_count = new sharded.Counter(question_ref, "bookmarks_count");

    bookmarks_count.incrementBy(1);
  });

exports.bookmark\u increment=functions.firestore.document（'questions/{question\u id}/bookmarks/{user\u uid}'））
.onCreate（异步（快照、上下文）=>{
//增量计数器的已编译客户端示例代码
var sharded=function（t）{var e={}；function r（n）{if（e[n]）返回e[n]。exports；var o=e[n]={i:n，l:！1，exports:{}；return t[n]。call（o.exports，o，o.exports，r），o.l=！0，o.exports}返回r.m=t，r.c=e，r.d=function（t，e，e，n）{r.o（t，e，e，e）{r.o（t，e）}Object“undefined”！=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty（t，Symbol.toStringTag，{value:“Module”}），Object.defineProperty（t，{value:！0}），r.t=函数（t，e）{if（1&e&（t=r（t）），8&e）返回t；if（4&e&“Object”==typeof t&&t&&t&&t.。\n模块）返回t；var n=Object create（null）；if（r），Object.defineProperty（n，“default”，{enumerable:！0，value:t}），2&e&“string”！=typeof t）for（var o in t）r.d（n，o，function（e）{return t[e]}.bind（null，o））；return n}，r.n=function（t）{var e=t&&t.u esModule function（）{return t.default}：function（）{return t t t}；return r.d（e，“a”，e），e}，r.o=function（t，e）{return Object.prototype.hasOwnProperty.call（t，e）}，r.p=“”，r（r.s=2）}（[function（t，e）{var r=“undefined”！=typeof crypto&&crypto.getRandomValues&&crypto.getRandomValues&&crypto.getRandomValues.bind（crypto）| |未定义”！=typeof msCrypto&&function=“function”=typeof window.msCrypto.getRandomValues.bind（msCrypto）；if（r）{var o=新数组（16）；t.出口=函数{{返回r（n），n}}其他{var o=新数组（16）；t.出口=函数{{为（var t t，e=0；e=0；e=0；e=0（VAT t t，e=0；e=0；e=e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0；e=0=0.0.0.0；t.5.0.长度-1[0[0[0.0.长度-0.0-0-0.0.0.0长度-0-1 -0-0.0.0.0长度-1）及（0[0）0 1][3]o[3]）若（6==i[0]和s.Lab标签=1e4）抛出新错误（“uuid.v1（）：不能创建超过10M个uuid/sec”）；u=p、a=v、o=l；var b=（1e4*（268435455&（p+=192928e5））+v>4294967296；f[c+=255、c+>b+]=b>>>8&255，f[c++]=255&b；var m=p/4294967296*1e4&26
import * as uuid from 'uuid';
import { firestore } from 'firebase-admin/lib/firestore';

export class DistributedCounter {
  static async incrementBy(doc: firestore.DocumentReference, field: string, val: number): Promise<void> {
    const shardId = uuid.v4();
    const increment: any = firestore.FieldValue.increment(val);
    const update: { [key: string]: any } = field
      .split('.')
      .reverse()
      .reduce((value, name) => ({ [name]: value }), increment);
    await doc.collection('_counter_shards_').doc(shardId).set(update, { merge: true });
  }
}