Protokoll-Import: KI-Erkennung (Gruppe, Teilnehmer, Status, Mehrfachpunkte), Ladeanzeige, Erstellungsdatum je Punkt

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

node_modules/undici/lib/handler/retry-handler.js

@@ -0,0 +1,653 @@
+'use strict'
+const assert = require('node:assert')
+
+const { kRetryHandlerDefaultRetry } = require('../core/symbols')
+const { RequestRetryError, RequestAbortedError } = require('../core/errors')
+const {
+  isDisturbed,
+  parseRangeHeader,
+  wrapRequestBody
+} = require('../core/util')
+
+function calculateRetryAfterHeader (retryAfter) {
+  const retryTime = new Date(retryAfter).getTime()
+  return isNaN(retryTime) ? null : retryTime - Date.now()
+}
+
+function validatePartialResponseContentLength (headers, range, statusCode, retryCount) {
+  const contentLength = headers['content-length']
+  if (contentLength == null) {
+    return
+  }
+
+  if (!Number.isFinite(range.start) || !Number.isFinite(range.end)) {
+    return
+  }
+
+  const length = Number(contentLength)
+  const expectedLength = range.end - range.start + 1
+  if (!Number.isFinite(length) || length !== expectedLength) {
+    throw new RequestRetryError('Content-Length mismatch', statusCode, {
+      headers,
+      data: { count: retryCount }
+    })
+  }
+}
+
+// A stable controller handed to the downstream handler for the lifetime of the
+// request. Each transparent retry/resume is a *separate* dispatch with its
+// *own* connection controller. Without a stable proxy the downstream body keeps
+// flow-controlling the original (now-dead) controller while data flows on the
+// new one: backpressure pauses the new connection's controller, but the
+// consumer's resume() targets the old one, so the resumed body stalls forever.
+// The proxy always forwards to the controller of the currently active connection.
+// An abort is additionally reported to the handler so it can cancel a pending
+// retry backoff instead of letting the request hang until the backoff elapses.
+// The notification is a private callback the handler hands over on construction,
+// so nothing outside the handler can trigger it.
+class RetryController {
+  #onAbort
+  #paused = false
+  #target = null
+
+  constructor (onAbort) {
+    this.#onAbort = onAbort
+  }
+
+  set target (target) {
+    this.#target = target
+    if (this.#paused) {
+      target?.pause()
+    }
+  }
+
+  get target () { return this.#target }
+
+  pause () {
+    this.#paused = true
+    this.#target?.pause()
+  }
+
+  resume () {
+    this.#paused = false
+    this.#target?.resume()
+  }
+
+  abort (reason) {
+    this.#target?.abort(reason)
+    this.#onAbort(reason)
+  }
+
+  get paused () { return this.#paused || (this.#target?.paused ?? false) }
+  get aborted () { return this.#target?.aborted ?? false }
+  get reason () { return this.#target?.reason ?? null }
+  get rawHeaders () { return this.#target?.rawHeaders ?? null }
+  set rawHeaders (value) {
+    if (this.#target) {
+      this.#target.rawHeaders = value
+    }
+  }
+
+  get rawTrailers () { return this.#target?.rawTrailers ?? null }
+  set rawTrailers (value) {
+    if (this.#target) {
+      this.#target.rawTrailers = value
+    }
+  }
+}
+
+class RetryHandler {
+  constructor (opts, { dispatch, handler }) {
+    const { retryOptions, ...dispatchOpts } = opts
+    const {
+      // Retry scoped
+      retry: retryFn,
+      maxRetries,
+      maxTimeout,
+      minTimeout,
+      timeoutFactor,
+      // Response scoped
+      methods,
+      errorCodes,
+      retryAfter,
+      statusCodes,
+      throwOnError
+    } = retryOptions ?? {}
+
+    this.error = null
+    this.dispatch = dispatch
+    this.handler = handler
+    this.opts = { ...dispatchOpts, body: wrapRequestBody(opts.body) }
+    this.retryOpts = {
+      throwOnError: throwOnError ?? true,
+      retry: retryFn ?? RetryHandler[kRetryHandlerDefaultRetry],
+      retryAfter: retryAfter ?? true,
+      maxTimeout: maxTimeout ?? 30 * 1000, // 30s,
+      minTimeout: minTimeout ?? 500, // .5s
+      timeoutFactor: timeoutFactor ?? 2,
+      maxRetries: maxRetries ?? 5,
+      // What errors we should retry
+      methods: methods ?? ['GET', 'HEAD', 'OPTIONS', 'PUT', 'DELETE', 'TRACE', 'QUERY'],
+      // Indicates which errors to retry
+      statusCodes: statusCodes ?? [500, 502, 503, 504, 429],
+      // List of errors to retry
+      errorCodes: errorCodes ?? [
+        'ECONNRESET',
+        'ECONNREFUSED',
+        'ENOTFOUND',
+        'ENETDOWN',
+        'ENETUNREACH',
+        'EHOSTDOWN',
+        'EHOSTUNREACH',
+        'EPIPE',
+        'UND_ERR_SOCKET'
+      ]
+    }
+
+    this.retryCount = 0
+    this.retryCountCheckpoint = 0
+    this.headersSent = false
+    this.start = 0
+    this.end = null
+    this.etag = null
+    this.statusCode = null
+    this.headers = null
+    this.controllerProxy = new RetryController(reason => this.#onAbort(reason))
+    // A retry decision is in flight (the policy may be holding a backoff
+    // timer). While pending, a consumer abort cancels the wait.
+    this.retryPending = false
+    // Backoff timer returned by the retry policy, so #onAbort can cancel it.
+    // Null for custom policies that do not return their timer.
+    this.retryTimer = null
+    // A response can complete while its controller is paused if the peer closes
+    // the connection. Hold its body until the retry policy decides whether to
+    // discard it for a retry or forward it as the final response.
+    this.pendingResponseData = null
+    this.pendingResponseTrailers = null
+    this.pendingResponseEnded = false
+    // Set once an abort during the backoff delivered the terminal error
+    // downstream; late policy callbacks and connection errors are then moot.
+    this.aborted = false
+  }
+
+  onResponseStartWithRetry (controller, statusCode, headers, statusMessage, err) {
+    if (this.retryOpts.throwOnError) {
+      // Preserve old behavior for status codes that are not eligible for retry
+      if (this.retryOpts.statusCodes.includes(statusCode) === false) {
+        if (this.headersSent) {
+          // The downstream handler already received the response from an
+          // earlier attempt. Forwarding this response would replace the
+          // downstream body and leave the original body pending forever.
+          this.handler.onResponseError?.(this.controllerProxy, err)
+        } else {
+          this.headersSent = true
+          this.checkpointResponseEnd(headers)
+          this.handler.onResponseStart?.(this.controllerProxy, statusCode, headers, statusMessage)
+        }
+      } else {
+        this.error = err
+      }
+
+      return
+    }
+
+    if (isDisturbed(this.opts.body)) {
+      this.headersSent = true
+      this.checkpointResponseEnd(headers)
+      this.handler.onResponseStart?.(this.controllerProxy, statusCode, headers, statusMessage)
+      return
+    }
+
+    function shouldRetry (passedErr) {
+      if (this.aborted) {
+        // Aborted while the policy was deciding; the decision is moot.
+        return
+      }
+      this.retryPending = false
+      this.retryTimer = null
+
+      const pendingData = this.pendingResponseData
+      const pendingTrailers = this.pendingResponseTrailers
+      const pendingEnd = this.pendingResponseEnded
+      this.pendingResponseData = null
+      this.pendingResponseTrailers = null
+      this.pendingResponseEnded = false
+
+      if (passedErr) {
+        if (this.headersSent) {
+          // The downstream handler already received the response from an
+          // earlier attempt. Forwarding this response would replace the
+          // downstream body and leave the original body pending forever.
+          this.handler.onResponseError?.(this.controllerProxy, passedErr)
+        } else {
+          this.headersSent = true
+          this.checkpointResponseEnd(headers)
+          this.handler.onResponseStart?.(this.controllerProxy, statusCode, headers, statusMessage)
+          controller.resume()
+
+          if (pendingEnd) {
+            for (const chunk of pendingData) {
+              this.onResponseData(controller, chunk)
+            }
+            this.onResponseEnd(controller, pendingTrailers)
+          }
+          return
+        }
+        controller.resume()
+        return
+      }
+
+      this.error = err
+      controller.resume()
+      if (pendingEnd) {
+        this.onResponseEnd(controller, pendingTrailers)
+      }
+    }
+
+    // The pause()/resume() pair (here and in shouldRetry) acts on THIS
+    // connection's controller -- never the downstream proxy. We hold this exact
+    // connection while the retry policy decides (possibly after a timeout) and
+    // must resume the same one. Routing this through controllerProxy would risk
+    // resuming a different connection if a later dispatch re-points the proxy in
+    // between, leaving this one paused forever -- the very stall the proxy exists
+    // to prevent.
+    controller.pause()
+    // The default policy returns its backoff timer so an abort can cancel it;
+    // a custom policy may return anything (or nothing), which is ignored.
+    this.retryPending = true
+    this.pendingResponseData = []
+    this.pendingResponseTrailers = null
+    this.pendingResponseEnded = false
+    this.retryTimer = this.retryOpts.retry(
+      err,
+      {
+        state: { counter: this.retryCount },
+        opts: { retryOptions: this.retryOpts, ...this.opts }
+      },
+      shouldRetry.bind(this)
+    ) ?? null
+  }
+
+  checkpointResponseEnd (headers) {
+    if (this.end == null && this.opts.method !== 'HEAD') {
+      const contentLength = headers['content-length']
+      this.end = contentLength != null ? Number(contentLength) - 1 : null
+
+      assert(
+        this.end == null || Number.isFinite(this.end),
+        'invalid content-length'
+      )
+
+      this.resume = this.end != null
+    }
+  }
+
+  onRequestStart (controller, context) {
+    // request.js creates a fresh RequestController per dispatch and passes that
+    // same instance to every later callback of the dispatch. onRequestStart is
+    // the first callback (it is where the controller is created), so re-pointing
+    // the proxy here is enough to keep it on the active connection across every
+    // transparent retry/resume.
+    this.controllerProxy.target = controller
+    if (!this.headersSent) {
+      this.handler.onRequestStart?.(this.controllerProxy, context)
+    }
+  }
+
+  onBodySent (chunk) {
+    this.handler.onBodySent?.(chunk)
+  }
+
+  onRequestSent () {
+    this.handler.onRequestSent?.()
+  }
+
+  onRequestUpgrade (_controller, statusCode, headers, socket) {
+    this.handler.onRequestUpgrade?.(this.controllerProxy, statusCode, headers, socket)
+  }
+
+  static [kRetryHandlerDefaultRetry] (err, { state, opts }, cb) {
+    const { statusCode, code, headers } = err
+    const { method, retryOptions } = opts
+    const {
+      maxRetries,
+      minTimeout,
+      maxTimeout,
+      timeoutFactor,
+      statusCodes,
+      errorCodes,
+      methods,
+      retryAfter
+    } = retryOptions
+    const { counter } = state
+
+    // Any code that is not a Undici's originated and allowed to retry
+    if (code && code !== 'UND_ERR_REQ_RETRY' && !errorCodes.includes(code)) {
+      cb(err)
+      return
+    }
+
+    // If a set of method are provided and the current method is not in the list
+    if (Array.isArray(methods) && !methods.includes(method)) {
+      cb(err)
+      return
+    }
+
+    // If a set of status code are provided and the current status code is not in the list
+    if (
+      statusCode != null &&
+      Array.isArray(statusCodes) &&
+      !statusCodes.includes(statusCode)
+    ) {
+      cb(err)
+      return
+    }
+
+    // If we reached the max number of retries
+    if (counter > maxRetries) {
+      cb(err)
+      return
+    }
+
+    let retryAfterHeader = retryAfter === false ? undefined : headers?.['retry-after']
+    if (retryAfterHeader) {
+      retryAfterHeader = Number(retryAfterHeader)
+      retryAfterHeader = Number.isNaN(retryAfterHeader)
+        ? calculateRetryAfterHeader(headers['retry-after'])
+        : retryAfterHeader * 1e3 // Retry-After is in seconds
+    }
+
+    const retryTimeout =
+      retryAfterHeader === 0
+        ? 0
+        : retryAfterHeader > 0
+          ? Math.min(retryAfterHeader, maxTimeout)
+          : Math.min(minTimeout * timeoutFactor ** (counter - 1), maxTimeout)
+
+    // Return the backoff timer so the handler can cancel it when the
+    // consumer aborts while the retry decision is pending.
+    return setTimeout(() => cb(null), retryTimeout)
+  }
+
+  onResponseStart (controller, statusCode, headers, statusMessage) {
+    if (statusCode < 200) {
+      this.handler.onResponseStart?.(this.controllerProxy, statusCode, headers, statusMessage)
+      return
+    }
+
+    this.error = null
+    this.retryCount += 1
+    this.statusCode = statusCode
+    this.headers = headers
+
+    // Checkpoint for resume from where we left it
+    if (this.headersSent) {
+      // Only Partial Content 206 supposed to provide Content-Range,
+      // any other status code that partially consumed the payload
+      // should not be retried because it would result in downstream
+      // wrongly concatenate multiple responses.
+      if (statusCode !== 206 && (this.start > 0 || statusCode !== 200)) {
+        throw new RequestRetryError('server does not support the range header and the payload was partially consumed', statusCode, {
+          headers,
+          data: { count: this.retryCount }
+        })
+      }
+
+      const contentRange = parseRangeHeader(headers['content-range'])
+      // If no content range
+      if (!contentRange) {
+        // We always throw here as we want to indicate that we entred unexpected path
+        throw new RequestRetryError('Content-Range mismatch', statusCode, {
+          headers,
+          data: { count: this.retryCount }
+        })
+      }
+
+      // Let's start with a weak etag check
+      if (this.etag != null && this.etag !== headers.etag) {
+        // We always throw here as we want to indicate that we entred unexpected path
+        throw new RequestRetryError('ETag mismatch', statusCode, {
+          headers,
+          data: { count: this.retryCount }
+        })
+      }
+
+      validatePartialResponseContentLength(headers, contentRange, statusCode, this.retryCount)
+
+      const { start, size, end = size ? size - 1 : null } = contentRange
+
+      if (this.start !== start || (this.end != null && this.end !== end)) {
+        throw new RequestRetryError('Content-Range mismatch', statusCode, {
+          headers,
+          data: { count: this.retryCount }
+        })
+      }
+
+      return
+    }
+
+    if (statusCode >= 300) {
+      const err = new RequestRetryError('Request failed', statusCode, {
+        headers,
+        data: {
+          count: this.retryCount
+        }
+      })
+
+      this.onResponseStartWithRetry(controller, statusCode, headers, statusMessage, err)
+      return
+    }
+
+    if (this.end == null) {
+      if (statusCode === 206) {
+        // First time we receive 206
+        const range = parseRangeHeader(headers['content-range'])
+
+        if (range == null || range.end == null) {
+          this.headersSent = true
+          this.handler.onResponseStart?.(
+            this.controllerProxy,
+            statusCode,
+            headers,
+            statusMessage
+          )
+          return
+        }
+
+        validatePartialResponseContentLength(headers, range, statusCode, this.retryCount)
+
+        const { start, size, end = size ? size - 1 : null } = range
+        assert(
+          start != null && Number.isFinite(start),
+          'content-range mismatch'
+        )
+        assert(end != null && Number.isFinite(end), 'invalid content-length')
+
+        this.start = start
+        this.end = end
+      }
+
+      // We make our best to checkpoint the body for further range headers
+      if (this.end == null && this.opts.method !== 'HEAD') {
+        const contentLength = headers['content-length']
+        this.end = contentLength != null ? Number(contentLength) - 1 : null
+      }
+
+      assert(Number.isFinite(this.start))
+      assert(
+        this.end == null || Number.isFinite(this.end),
+        'invalid content-length'
+      )
+
+      this.resume = true
+      this.etag = headers.etag != null ? headers.etag : null
+
+      // Weak etags are not useful for comparison nor cache
+      // for instance not safe to assume if the response is byte-per-byte
+      // equal
+      if (
+        this.etag != null &&
+        this.etag[0] === 'W' &&
+        this.etag[1] === '/'
+      ) {
+        this.etag = null
+      }
+
+      this.headersSent = true
+      this.handler.onResponseStart?.(
+        this.controllerProxy,
+        statusCode,
+        headers,
+        statusMessage
+      )
+    } else {
+      throw new RequestRetryError('Request failed', statusCode, {
+        headers,
+        data: { count: this.retryCount }
+      })
+    }
+  }
+
+  onResponseData (_controller, chunk) {
+    if (this.pendingResponseData !== null) {
+      this.pendingResponseData.push(chunk)
+      return
+    }
+
+    if (this.error) {
+      return
+    }
+
+    this.start += chunk.length
+
+    this.handler.onResponseData?.(this.controllerProxy, chunk)
+  }
+
+  onResponseEnd (_controller, trailers) {
+    if (this.pendingResponseData !== null) {
+      this.pendingResponseTrailers = trailers
+      this.pendingResponseEnded = true
+      return
+    }
+
+    if (this.error && this.retryOpts.throwOnError) {
+      throw this.error
+    }
+
+    if (!this.error) {
+      // Verify that the received body length matches the expected range
+      // when we have a finite end position (from Content-Length or Content-Range)
+      if (this.end != null && Number.isFinite(this.end)) {
+        if (this.start !== this.end + 1) {
+          throw new RequestRetryError('Content-Range mismatch', this.statusCode, {
+            headers: this.headers,
+            data: { count: this.retryCount }
+          })
+        }
+      }
+      this.retryCount = 0
+      return this.handler.onResponseEnd?.(this.controllerProxy, trailers)
+    }
+
+    this.retry()
+  }
+
+  retry () {
+    if (this.start !== 0) {
+      const headers = { range: `bytes=${this.start}-${this.end ?? ''}` }
+
+      // Weak etag check - weak etags will make comparison algorithms never match
+      if (this.etag != null) {
+        headers['if-match'] = this.etag
+      }
+
+      this.opts = {
+        ...this.opts,
+        headers: {
+          ...this.opts.headers,
+          ...headers
+        }
+      }
+    }
+
+    try {
+      this.retryCountCheckpoint = this.retryCount
+      this.dispatch(this.opts, this)
+    } catch (err) {
+      this.handler.onResponseError?.(this.controllerProxy, err)
+    }
+  }
+
+  onResponseError (controller, err) {
+    if (this.aborted) {
+      // #onAbort already delivered the terminal error downstream; the late
+      // error of the torn-down connection must not be forwarded twice.
+      return
+    }
+
+    // controller is THIS failed connection (not the proxy): we inspect whether
+    // the consumer aborted it to decide retry-vs-propagate.
+    if (controller?.aborted || isDisturbed(this.opts.body) || (this.headersSent && !this.resume)) {
+      this.handler.onResponseError?.(this.controllerProxy, err)
+      return
+    }
+
+    function shouldRetry (returnedErr) {
+      if (this.aborted) {
+        // Aborted while the policy was deciding; the decision is moot.
+        return
+      }
+      this.retryPending = false
+      this.retryTimer = null
+
+      if (!returnedErr) {
+        this.retry()
+        return
+      }
+
+      this.handler?.onResponseError?.(this.controllerProxy, returnedErr)
+    }
+
+    // We reconcile in case of a mix between network errors
+    // and server error response
+    if (this.retryCount - this.retryCountCheckpoint > 0) {
+      // We count the difference between the last checkpoint and the current retry count
+      this.retryCount =
+        this.retryCountCheckpoint +
+        (this.retryCount - this.retryCountCheckpoint)
+    } else {
+      this.retryCount += 1
+    }
+
+    this.retryPending = true
+    this.retryTimer = this.retryOpts.retry(
+      err,
+      {
+        state: { counter: this.retryCount },
+        opts: { retryOptions: this.retryOpts, ...this.opts }
+      },
+      shouldRetry.bind(this)
+    ) ?? null
+  }
+
+  #onAbort (reason) {
+    // A consumer abort lands on the controller proxy. If the retry policy is
+    // still deciding (typically holding a backoff timer), cancel the wait and
+    // surface the abort immediately instead of letting the request hang until
+    // the backoff elapses.
+    if (!this.retryPending) {
+      return
+    }
+
+    this.aborted = true
+    this.retryPending = false
+    clearTimeout(this.retryTimer)
+    this.retryTimer = null
+    this.pendingResponseData = null
+    this.pendingResponseTrailers = null
+    this.pendingResponseEnded = false
+    this.handler.onResponseError?.(this.controllerProxy, reason ?? new RequestAbortedError())
+  }
+}
+
+module.exports = RetryHandler