我现在的做法是多创建一个临时文件,然后删除原文件,重命名临时文件,我想知道有没有更好的办法来实现用 node 流来改写同文件?
代码如下
const rm = require('rimraf')
const through2 = require('through2')
const fs = require('graceful-fs')
// source file path
const replacementPath = `./static/projects/${destPath}/index.html`
// temp file path
const tempfilePath = `./static/projects/${destPath}/tempfile.html`
// read source file then write into temp file
await promiseReplace(replacementPath, tempfilePath)
// del the source file
rm.sync(replacementPath)
// rename the temp file name to source file name
fs.renameSync(tempfilePath, replacementPath)
// del the temp file
rm.sync(tempfilePath)
// promiseify readStream and writeStream
function promiseReplace (readfile, writefile) {
return new Promise((res, rej) => {
fs.createReadStream(readfile)
.pipe(through2.obj(function (chunk, encoding, done) {
const replaced = chunk.toString().replace(/id="wrap"/g, 'dududud')
done(null, replaced)
}))
.pipe(fs.createWriteStream(writefile))
.on('finish', () => {
console.log('replace done')
res()
})
.on('error', (err) => {
console.log(err)
rej(err)
})
})
}
1
qiuyk 2017-10-04 01:01:03 +08:00
应该是不行的 要么全读进内存 要么创建临时文件
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