0.0.1

node_modules/streamx/examples/fs.js

@@ -0,0 +1,73 @@
+const fs = require('fs')
+const { Writable, Readable } = require('../')
+
+class FileWriteStream extends Writable {
+  constructor (filename, mode) {
+    super()
+    this.filename = filename
+    this.mode = mode
+    this.fd = 0
+  }
+
+  _open (cb) {
+    fs.open(this.filename, this.mode, (err, fd) => {
+      if (err) return cb(err)
+      this.fd = fd
+      cb(null)
+    })
+  }
+
+  _write (data, cb) {
+    fs.write(this.fd, data, 0, data.length, null, (err, written) => {
+      if (err) return cb(err)
+      if (written !== data.length) return this._write(data.slice(written), cb)
+      cb(null)
+    })
+  }
+
+  _destroy (cb) {
+    if (!this.fd) return cb()
+    fs.close(this.fd, cb)
+  }
+}
+
+class FileReadStream extends Readable {
+  constructor (filename) {
+    super()
+    this.filename = filename
+    this.fd = 0
+  }
+
+  _open (cb) {
+    fs.open(this.filename, 'r', (err, fd) => {
+      if (err) return cb(err)
+      this.fd = fd
+      cb(null)
+    })
+  }
+
+  _read (cb) {
+    let data = Buffer.alloc(16 * 1024)
+
+    fs.read(this.fd, data, 0, data.length, null, (err, read) => {
+      if (err) return cb(err)
+      if (read !== data.length) data = data.slice(0, read)
+      this.push(data.length ? data : null)
+      cb(null)
+    })
+  }
+
+  _destroy (cb) {
+    if (!this.fd) return cb()
+    fs.close(this.fd, cb)
+  }
+}
+
+// copy this file as an example
+
+const rs = new FileReadStream(__filename)
+const ws = new FileWriteStream(`${__filename}.cpy`, 'w')
+
+rs.pipe(ws, function (err) {
+  console.log('file copied', err)
+})