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小程序開發(fā) | 文件系統(tǒng)能力
時(shí)間：2019-01-15 16:40:21
文章發(fā)布：杜凱
原創(chuàng)作者：未知
來(lái)源：微信公眾平臺(tái)

文件系統(tǒng)能力

文件系統(tǒng)能力可便于用戶在客戶端保存文件資源，并在下次啟動(dòng)客戶端之后可以使用已保存的文件。


只要用戶不主動(dòng)刪除小程序或小游戲，并保持一定的使用頻率，文件都可以一直被保留。


合理的使用文件系統(tǒng)能力來(lái)緩存資源文件，可以給開發(fā)者更好的使用體驗(yàn)。




今天，我們來(lái)分享文件系統(tǒng)能力的小故事。


1

文件系統(tǒng)的演進(jìn)歷史


小程序在早發(fā)布的版本中就已提供了基礎(chǔ)的文件存儲(chǔ)和刪除接口：wx.saveFile、 wx.removeSavedFile ；


對(duì)于絕大部分的小程序來(lái)說(shuō)，這兩個(gè)接口已經(jīng)能夠滿足開發(fā)者的需求。但對(duì)于小游戲來(lái)說(shuō)，需要更完整的能力來(lái)做支撐。


因此，發(fā)布小游戲的時(shí)候我們便提供了一套更完整的文件管理系統(tǒng)：FileSystemManager，其中主要包含了目錄管理、文件內(nèi)容讀寫等能力。


2

文件系統(tǒng)的設(shè)計(jì)背景


文件系統(tǒng)能力是應(yīng)小游戲開發(fā)需求的迭代而逐步增強(qiáng)的。在小程序的場(chǎng)景下，很多時(shí)候只是需要把一個(gè)圖片或視頻資源緩存起來(lái)便可繼續(xù)使用，文件內(nèi)容與文件存儲(chǔ)的目錄結(jié)構(gòu)都不是開發(fā)者所關(guān)心的。


但是在小游戲場(chǎng)景下情況則不同——


一方面，小游戲除了有圖片和視頻文件、還有游戲引擎生成的配置文件，游戲需要能夠去讀取并理解配置文件的具體內(nèi)容；


另一方面，游戲使用的資源文件會(huì)比普通小程序更多，若沒有內(nèi)容目錄管理的功能，維護(hù)成本會(huì)變高。


除此之外，由于小游戲代碼包大小限制只有4MB (加上分包上限8MB)，對(duì)于一些偏重的游戲，資源甚至容易超100MB。


因此在此大背景下，我們給文件系統(tǒng)主要增加了目錄管理、文件內(nèi)容讀寫等兩項(xiàng)接口——


目錄管理的需求場(chǎng)景是在使用游戲引擎時(shí)需要按目錄來(lái)管理資源文件，文件內(nèi)容讀寫的需求場(chǎng)景是在使用游戲引擎時(shí)需要讀取配置文件；同時(shí)，我們對(duì)小游戲類目的本地存儲(chǔ)容量的規(guī)范限制擴(kuò)容到50MB。


開發(fā)者可能會(huì)疑惑，為什么在小程序的文件系統(tǒng)中會(huì)有一些功能相接近的接口？例如，想緩存一個(gè)文件，可以用 saveFile 或 copyFile ；再比如 removeSavedFile和 unlink 都可以用來(lái)刪除一個(gè)文件。


上述情況的原因是我們?cè)谠缙诒闾峁┝嘶A(chǔ)的文件存儲(chǔ)接口 saveFile 和removeFile ，但不提供自定義目錄相關(guān)的能力，開發(fā)者調(diào)用 saveFile 之后只能得到微信返回到的一個(gè)隨機(jī)文件名。


小游戲應(yīng)運(yùn)而生的同時(shí)也增強(qiáng)了對(duì)文件系統(tǒng)能力擴(kuò)展的需求，為了保證向后兼容，我們保留了這批基礎(chǔ)接口，并在這個(gè)基礎(chǔ)上增加了目錄管理接口以及對(duì)應(yīng)的文件操作接口。因此，便出現(xiàn)了上述一些相似接口的情況。


3

文件系統(tǒng)的優(yōu)勢(shì)—存儲(chǔ)隔離


有不少開發(fā)者詢問過關(guān)于文件存儲(chǔ)的問題，他們擔(dān)心文件內(nèi)容被其他小程序讀取到，也擔(dān)心多個(gè)登錄用戶之間的文件內(nèi)容會(huì)互相影響。為了保證用戶的隱私安全，也為了保證小程序的數(shù)據(jù)安全，本地文件存儲(chǔ)的一個(gè)重要規(guī)則便是保證隔離。


文件被存儲(chǔ)到本地后，會(huì)以小程序賬號(hào)和用戶賬號(hào)兩個(gè)不同的維度來(lái)區(qū)分和隔離。即：同個(gè)微信用戶使用不同小程序之間的文件存儲(chǔ)會(huì)互相隔離；不同微信用戶（在同一臺(tái)手機(jī)中）使用同個(gè)小程序時(shí)，不同用戶間的文件存儲(chǔ)也會(huì)互相隔離。



4

適當(dāng)?shù)拇鎯?chǔ)容量


考慮到存儲(chǔ)的問題，我們規(guī)范了小游戲文件存儲(chǔ)的容量。普通小程序是10MB，小游戲則是50MB，當(dāng)文件存儲(chǔ)超出限制時(shí)，寫入的文件會(huì)失敗。


功能上線以后，我們?cè)盏竭^若干寶貴意見與反饋，希望能提高容量限制。但在經(jīng)過反復(fù)論證與評(píng)估后，我們認(rèn)為如果將文件存儲(chǔ)的容量再往上提，就會(huì)有用戶新增需要管理或清理手機(jī)存儲(chǔ)空間的需求，小程序和小游戲?qū)?huì)變得不再“小”了。對(duì)于資源文件超過上述標(biāo)準(zhǔn)限制的小程序與小游戲，應(yīng)該合理地管理本地文件，及時(shí)清理不常用的文件，這樣在大多數(shù)情況下，手機(jī)存儲(chǔ)空間便能保證順暢。



小程序開發(fā)
標(biāo)簽： 文件系統(tǒng)
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