feat: bufferring free multipart body encoder

Author: Gozala

packages/ipfs-core-utils/package.json

@@ -11,6 +11,10 @@
     "src",
     "dist"
   ],
+  "browser": {
+    "./src/lib/blob.js": "./src/lib/blob.browser.js",
+    "./src/lib/file.js": "./src/lib/file.browser.js"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/ipfs/js-ipfs.git"
@@ -40,4 +44,4 @@
     "dirty-chai": "^2.0.1",
     "it-all": "^1.0.1"
   }
-}
+}

packages/ipfs-core-utils/src/files/blob.browser.js

@@ -0,0 +1,24 @@
+// @ts-check
+'use strict'
+/* eslint-env browser */
+
+exports.Blob = Blob
+
+/**
+ * Universal blob reading function
+ * @param {Blob} blob
+ * @returns {AsyncIterable<Uint8Array>}
+ */
+const readBlob = async function * (blob) {
+  const { body } = new Response(blob)
+  const reader = body.getReader()
+  while (true) {
+    const next = await reader.read()
+    if (next.done) {
+      return
+    } else {
+      yield next.value
+    }
+  }
+}
+exports.readBlob = readBlob

packages/ipfs-core-utils/src/files/blob.js

@@ -0,0 +1,186 @@
+// @ts-check
+'use strict'
+
+const { TextEncoder, TextDecoder } = require('util')
+
+class Blob {
+  /**
+   *
+   * @param {BlobPart[]} init
+   * @param {Object} [options]
+   * @param {string} [options.type]
+   *
+   */
+  constructor (init, options = {}) {
+    /** @type {Uint8Array[]} */
+    const parts = []
+
+    let size = 0
+    for (const part of init) {
+      if (typeof part === 'string') {
+        const bytes = new TextEncoder().encode(part)
+        parts.push(bytes)
+        size += bytes.byteLength
+      } else if (part instanceof Blob) {
+        size += part.size
+        // @ts-ignore - `_parts` is marked private so TS will complain about
+        // accessing it.
+        parts.push(...part._parts)
+      } else if (part instanceof ArrayBuffer) {
+        parts.push(new Uint8Array(part))
+        size += part.byteLength
+      } else if (part instanceof Uint8Array) {
+        parts.push(part)
+        size += part.byteLength
+      } else if (ArrayBuffer.isView(part)) {
+        const { buffer, byteOffset, byteLength } = part
+        parts.push(new Uint8Array(buffer, byteOffset, byteLength))
+        size += byteLength
+      } else {
+        throw new TypeError(`Can not convert ${part} value to a BlobPart`)
+      }
+    }
+
+    /** @private */
+    this._size = size
+    /** @private */
+    this._type = options.type || ''
+    /** @private */
+    this._parts = parts
+  }
+
+  /**
+   * A string indicating the MIME type of the data contained in the Blob.
+   * If the type is unknown, this string is empty.
+   * @type {string}
+   */
+  get type () {
+    return this._type
+  }
+
+  /**
+   * The size, in bytes, of the data contained in the Blob object.
+   * @type {number}
+   */
+  get size () {
+    return this._size
+  }
+
+  /**
+   * Returns a new Blob object containing the data in the specified range of
+   * bytes of the blob on which it's called.
+   * @param {number} [start=0] - An index into the Blob indicating the first
+   * byte to include in the new Blob. If you specify a negative value, it's
+   * treated as an offset from the end of the Blob toward the beginning. For
+   * example, `-10` would be the 10th from last byte in the Blob. The default
+   * value is `0`. If you specify a value for start that is larger than the
+   * size of the source Blob, the returned Blob has size 0 and contains no
+   * data.
+   * @param {number} [end] - An index into the `Blob` indicating the first byte
+   *  that will *not* be included in the new `Blob` (i.e. the byte exactly at
+   * this index is not included). If you specify a negative value, it's treated
+   * as an offset from the end of the Blob toward the beginning. For example,
+   * `-10` would be the 10th from last byte in the `Blob`. The default value is
+   * size.
+   * @param {string} [type] - The content type to assign to the new Blob;
+   * this will be the value of its type property. The default value is an empty
+   * string.
+   * @returns {Blob}
+   */
+  slice (start = 0, end = this.size, type = '') {
+    const { size, _parts } = this
+    let offset = start < 0
+      ? Math.max(size + start, 0)
+      : Math.min(start, size)
+
+    let limit = (end < 0 ? Math.max(size + end, 0) : Math.min(end, size))
+    const span = Math.max(limit - offset, 0)
+
+    let blobSize = 0
+    const blobParts = []
+    for (const part of _parts) {
+      const { byteLength } = part
+      if (offset > 0 && byteLength <= offset) {
+        offset -= byteLength
+        limit -= byteLength
+      } else {
+        const chunk = part.subarray(offset, Math.min(byteLength, limit))
+        blobParts.push(chunk)
+        blobSize += chunk.byteLength
+        // no longer need to take that into account
+        offset = 0
+
+        // don't add the overflow to new blobParts
+        if (blobSize >= span) {
+          break
+        }
+      }
+    }
+
+    const blob = new Blob([], { type })
+    blob._parts = blobParts
+    blob._size = blobSize
+
+    return blob
+  }
+
+  /**
+   * Returns a promise that resolves with an ArrayBuffer containing the entire
+   * contents of the Blob as binary data.
+   * @returns {Promise<ArrayBuffer>}
+   */
+  // eslint-disable-next-line require-await
+  async arrayBuffer () {
+    const buffer = new ArrayBuffer(this.size)
+    const bytes = new Uint8Array(buffer)
+    let offset = 0
+    for (const part of this._parts) {
+      bytes.set(part, offset)
+      offset += part.byteLength
+    }
+    return buffer
+  }
+
+  /**
+   * Returns a promise that resolves with a USVString containing the entire
+   * contents of the Blob interpreted as UTF-8 text.
+   * @returns {Promise<string>}
+   */
+  // eslint-disable-next-line require-await
+  async text () {
+    const decoder = new TextDecoder()
+    let text = ''
+    for (const part of this._parts) {
+      text += decoder.decode(part)
+    }
+    return text
+  }
+
+  /**
+   * @returns {never}
+   */
+  // eslint-disable-next-line valid-jsdoc
+  stream () {
+    throw Error('Not implemented')
+  }
+
+  /**
+   * Non standard, but if `ReadableStream`s are extended to be
+   * made async iterable why not blobs.
+   * @returns {AsyncIterator<Uint8Array>}
+   */
+  // eslint-disable-next-line require-await
+  async * [Symbol.asyncIterator] () {
+    yield * this._parts
+  }
+}
+
+exports.Blob = Blob
+
+/**
+ * Universal blob reading function
+ * @param {Blob} blob
+ * @returns {AsyncIterable<Uint8Array>}
+ */
+const readBlob = (blob) => blob
+exports.readBlob = readBlob

packages/ipfs-core-utils/src/files/file.browser.js

@@ -0,0 +1,4 @@
+'use strict'
+/* eslint-env browser */
+
+exports.File = File

packages/ipfs-core-utils/src/files/file.js

@@ -0,0 +1,55 @@
+// @ts-check
+'use strict'
+
+const { Blob } = require('./blob')
+
+class File extends Blob {
+  /**
+   *
+   * @param {BlobPart[]} init
+   * @param {string} name - A USVString representing the file name or the path
+   * to the file.
+   * @param {Object} [options]
+   * @param {string} [options.type] -  A DOMString representing the MIME type
+   * of the content that will be put into the file. Defaults to a value of "".
+   * @param {number} [options.lastModified] - A number representing the number
+   * of milliseconds between the Unix time epoch and when the file was last
+   * modified. Defaults to a value of Date.now().
+   */
+  constructor (init, name, options = {}) {
+    super(init, options)
+    /** @private */
+    this._name = name.replace(/\//g, ':')
+    this._lastModified = options.lastModified || Date.now()
+  }
+
+  /**
+   * The name of the file referenced by the File object.
+   * @type {string}
+   */
+  get name () {
+    return this._name
+  }
+
+  /**
+   * The path the URL of the File is relative to.
+   * @type {string}
+   */
+  get webkitRelativePath () {
+    return ''
+  }
+
+  /**
+   * Returns the last modified time of the file, in millisecond since the UNIX
+   * epoch (January 1st, 1970 at Midnight).
+   * @returns {number}
+   */
+  get lastModified () {
+    return this._lastModified
+  }
+
+  get [Symbol.toStringTag] () {
+    return 'File'
+  }
+}
+exports.File = File