1 files changed, 220 insertions, 0 deletions
diff --git a/lib/api/api-stream.js b/lib/api/api-stream.js
new file mode 100644
index 0000000..c571a6f
--- /dev/null
+++ b/lib/api/api-stream.js
@@ -0,0 +1,220 @@
+'use strict'
+
+const { finished, PassThrough } = require('stream')
+const {
+  InvalidArgumentError,
+  InvalidReturnValueError,
+  RequestAbortedError
+} = require('../core/errors')
+const util = require('../core/util')
+const { getResolveErrorBodyCallback } = require('./util')
+const { AsyncResource } = require('async_hooks')
+const { addSignal, removeSignal } = require('./abort-signal')
+
+class StreamHandler extends AsyncResource {
+  constructor (opts, factory, callback) {
+    if (!opts || typeof opts !== 'object') {
+      throw new InvalidArgumentError('invalid opts')
+    }
+
+    const { signal, method, opaque, body, onInfo, responseHeaders, throwOnError } = opts
+
+    try {
+      if (typeof callback !== 'function') {
+        throw new InvalidArgumentError('invalid callback')
+      }
+
+      if (typeof factory !== 'function') {
+        throw new InvalidArgumentError('invalid factory')
+      }
+
+      if (signal && typeof signal.on !== 'function' && typeof signal.addEventListener !== 'function') {
+        throw new InvalidArgumentError('signal must be an EventEmitter or EventTarget')
+      }
+
+      if (method === 'CONNECT') {
+        throw new InvalidArgumentError('invalid method')
+      }
+
+      if (onInfo && typeof onInfo !== 'function') {
+        throw new InvalidArgumentError('invalid onInfo callback')
+      }
+
+      super('UNDICI_STREAM')
+    } catch (err) {
+      if (util.isStream(body)) {
+        util.destroy(body.on('error', util.nop), err)
+      }
+      throw err
+    }
+
+    this.responseHeaders = responseHeaders || null
+    this.opaque = opaque || null
+    this.factory = factory
+    this.callback = callback
+    this.res = null
+    this.abort = null
+    this.context = null
+    this.trailers = null
+    this.body = body
+    this.onInfo = onInfo || null
+    this.throwOnError = throwOnError || false
+
+    if (util.isStream(body)) {
+      body.on('error', (err) => {
+        this.onError(err)
+      })
+    }
+
+    addSignal(this, signal)
+  }
+
+  onConnect (abort, context) {
+    if (!this.callback) {
+      throw new RequestAbortedError()
+    }
+
+    this.abort = abort
+    this.context = context
+  }
+
+  onHeaders (statusCode, rawHeaders, resume, statusMessage) {
+    const { factory, opaque, context, callback, responseHeaders } = this
+
+    const headers = responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
+
+    if (statusCode < 200) {
+      if (this.onInfo) {
+        this.onInfo({ statusCode, headers })
+      }
+      return
+    }
+
+    this.factory = null
+
+    let res
+
+    if (this.throwOnError && statusCode >= 400) {
+      const parsedHeaders = responseHeaders === 'raw' ? util.parseHeaders(rawHeaders) : headers
+      const contentType = parsedHeaders['content-type']
+      res = new PassThrough()
+
+      this.callback = null
+      this.runInAsyncScope(getResolveErrorBodyCallback, null,
+        { callback, body: res, contentType, statusCode, statusMessage, headers }
+      )
+    } else {
+      if (factory === null) {
+        return
+      }
+
+      res = this.runInAsyncScope(factory, null, {
+        statusCode,
+        headers,
+        opaque,
+        context
+      })
+
+      if (
+        !res ||
+        typeof res.write !== 'function' ||
+        typeof res.end !== 'function' ||
+        typeof res.on !== 'function'
+      ) {
+        throw new InvalidReturnValueError('expected Writable')
+      }
+
+      // TODO: Avoid finished. It registers an unnecessary amount of listeners.
+      finished(res, { readable: false }, (err) => {
+        const { callback, res, opaque, trailers, abort } = this
+
+        this.res = null
+        if (err || !res.readable) {
+          util.destroy(res, err)
+        }
+
+        this.callback = null
+        this.runInAsyncScope(callback, null, err || null, { opaque, trailers })
+
+        if (err) {
+          abort()
+        }
+      })
+    }
+
+    res.on('drain', resume)
+
+    this.res = res
+
+    const needDrain = res.writableNeedDrain !== undefined
+      ? res.writableNeedDrain
+      : res._writableState && res._writableState.needDrain
+
+    return needDrain !== true
+  }
+
+  onData (chunk) {
+    const { res } = this
+
+    return res ? res.write(chunk) : true
+  }
+
+  onComplete (trailers) {
+    const { res } = this
+
+    removeSignal(this)
+
+    if (!res) {
+      return
+    }
+
+    this.trailers = util.parseHeaders(trailers)
+
+    res.end()
+  }
+
+  onError (err) {
+    const { res, callback, opaque, body } = this
+
+    removeSignal(this)
+
+    this.factory = null
+
+    if (res) {
+      this.res = null
+      util.destroy(res, err)
+    } else if (callback) {
+      this.callback = null
+      queueMicrotask(() => {
+        this.runInAsyncScope(callback, null, err, { opaque })
+      })
+    }
+
+    if (body) {
+      this.body = null
+      util.destroy(body, err)
+    }
+  }
+}
+
+function stream (opts, factory, callback) {
+  if (callback === undefined) {
+    return new Promise((resolve, reject) => {
+      stream.call(this, opts, factory, (err, data) => {
+        return err ? reject(err) : resolve(data)
+      })
+    })
+  }
+
+  try {
+    this.dispatch(opts, new StreamHandler(opts, factory, callback))
+  } catch (err) {
+    if (typeof callback !== 'function') {
+      throw err
+    }
+    const opaque = opts && opts.opaque
+    queueMicrotask(() => callback(err, { opaque }))
+  }
+}
+
+module.exports = stream