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我在Google雲端存儲中構建了一個非常薄的包裝，使其看起來更像localStorage。我知道同一個對象每秒只能寫入一次，但是這段代碼從來沒有寫過每秒更快的東西，我不知道爲什麼。我已經確認實際使用代碼時對象名稱是不同的。爲什麼上傳時Google雲端存儲的瘦身包裝太慢了？
(function() {
// a Google Cloud Storage API modeled somewhat after localStorage
class CloudStore {
constructor(name) {
const me = this,
Storage = require('@google-cloud/storage');
me.storage = Storage();
me.bucket = me.storage.bucket(name+"_anywhichway");
me.bucket.exists().then((data) => {
data[0] || me.storage.createBucket(name+"_anywhichway")
.then((data) => me.bucket = data[0]);
me.bucket.getFiles((data) => {
!data || (me.files = data[0]);
})
});
}
async clear() {
await this.bucket.deleteFiles({force:true});
}
async count() {
return (this.files ? this.files.length : 0);
}
async delete(id) {
this.storageProvider.removeItem(id);
if(!this.files) {
[this.files] = await this.bucket.getFiles();
} else {
const i = this.files.findIndex((item) => item.name===id);
i===-1 || this.files.splice(0,i,1);
}
}
async get(id) { // usually around 3,300 rec/sec
const me = this,
streams = require('memory-streams');
return new Promise((resolve,reject) => {
const writable = new streams.WritableStream();
me.bucket.file(id).createReadStream({validation:false})
.on('error', (err) => { console.log(id,err.message); })
.on('response', (response) => { })
.on('end',() => { resolve(writable.toString()); })
.pipe(writable);
});
}
async key(number) {
if(this.files[number]) return this.files[number].name;
}
async set(id,data) { // never faster than 1.01 rec/sec
const me = this;
return new Promise((resolve,reject) => {
const file = me.bucket.file(id),
stream = file.createWriteStream();
stream.end(data,"utf8",async() => {
// only get the file list once from Google
// then manage a pseudo-list locally for speed
// tried commenting this out to see if it improved
// performance, it did not
if(!me.files) {
[me.files] = await me.bucket.getFiles();
} else {
me.files.push({name:id});
}
resolve(id);
});
});
}
}
module.exports = CloudStore;
}).call(this);
測試代碼：
const storage = new CloudStore("test");
const size = 10,
start = Date.now();
for(let i=0;i<size;i++) {
await storage.set("Object#"+i,JSON.stringify({item:i}));
}
const set= Date.now();
let expired = set- start,
persec = size/(expired/1000);
console.log("set",expired,persec);