diff options
Diffstat (limited to 'node_modules/undici/lib/handler/RetryHandler.js')
| -rw-r--r-- | node_modules/undici/lib/handler/RetryHandler.js | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/node_modules/undici/lib/handler/RetryHandler.js b/node_modules/undici/lib/handler/RetryHandler.js new file mode 100644 index 0000000..3710447 --- /dev/null +++ b/node_modules/undici/lib/handler/RetryHandler.js @@ -0,0 +1,336 @@ +const assert = require('assert') + +const { kRetryHandlerDefaultRetry } = require('../core/symbols') +const { RequestRetryError } = require('../core/errors') +const { isDisturbed, parseHeaders, parseRangeHeader } = require('../core/util') + +function calculateRetryAfterHeader (retryAfter) { + const current = Date.now() + const diff = new Date(retryAfter).getTime() - current + + return diff +} + +class RetryHandler { + constructor (opts, handlers) { + const { retryOptions, ...dispatchOpts } = opts + const { + // Retry scoped + retry: retryFn, + maxRetries, + maxTimeout, + minTimeout, + timeoutFactor, + // Response scoped + methods, + errorCodes, + retryAfter, + statusCodes + } = retryOptions ?? {} + + this.dispatch = handlers.dispatch + this.handler = handlers.handler + this.opts = dispatchOpts + this.abort = null + this.aborted = false + this.retryOpts = { + retry: retryFn ?? RetryHandler[kRetryHandlerDefaultRetry], + retryAfter: retryAfter ?? true, + maxTimeout: maxTimeout ?? 30 * 1000, // 30s, + timeout: minTimeout ?? 500, // .5s + timeoutFactor: timeoutFactor ?? 2, + maxRetries: maxRetries ?? 5, + // What errors we should retry + methods: methods ?? ['GET', 'HEAD', 'OPTIONS', 'PUT', 'DELETE', 'TRACE'], + // 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' + ] + } + + this.retryCount = 0 + this.start = 0 + this.end = null + this.etag = null + this.resume = null + + // Handle possible onConnect duplication + this.handler.onConnect(reason => { + this.aborted = true + if (this.abort) { + this.abort(reason) + } else { + this.reason = reason + } + }) + } + + onRequestSent () { + if (this.handler.onRequestSent) { + this.handler.onRequestSent() + } + } + + onUpgrade (statusCode, headers, socket) { + if (this.handler.onUpgrade) { + this.handler.onUpgrade(statusCode, headers, socket) + } + } + + onConnect (abort) { + if (this.aborted) { + abort(this.reason) + } else { + this.abort = abort + } + } + + onBodySent (chunk) { + if (this.handler.onBodySent) return this.handler.onBodySent(chunk) + } + + static [kRetryHandlerDefaultRetry] (err, { state, opts }, cb) { + const { statusCode, code, headers } = err + const { method, retryOptions } = opts + const { + maxRetries, + timeout, + maxTimeout, + timeoutFactor, + statusCodes, + errorCodes, + methods + } = retryOptions + let { counter, currentTimeout } = state + + currentTimeout = + currentTimeout != null && currentTimeout > 0 ? currentTimeout : timeout + + // Any code that is not a Undici's originated and allowed to retry + if ( + code && + code !== 'UND_ERR_REQ_RETRY' && + code !== 'UND_ERR_SOCKET' && + !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 = headers != null && headers['retry-after'] + if (retryAfterHeader) { + retryAfterHeader = Number(retryAfterHeader) + retryAfterHeader = isNaN(retryAfterHeader) + ? calculateRetryAfterHeader(retryAfterHeader) + : retryAfterHeader * 1e3 // Retry-After is in seconds + } + + const retryTimeout = + retryAfterHeader > 0 + ? Math.min(retryAfterHeader, maxTimeout) + : Math.min(currentTimeout * timeoutFactor ** counter, maxTimeout) + + state.currentTimeout = retryTimeout + + setTimeout(() => cb(null), retryTimeout) + } + + onHeaders (statusCode, rawHeaders, resume, statusMessage) { + const headers = parseHeaders(rawHeaders) + + this.retryCount += 1 + + if (statusCode >= 300) { + this.abort( + new RequestRetryError('Request failed', statusCode, { + headers, + count: this.retryCount + }) + ) + return false + } + + // Checkpoint for resume from where we left it + if (this.resume != null) { + this.resume = null + + if (statusCode !== 206) { + return true + } + + const contentRange = parseRangeHeader(headers['content-range']) + // If no content range + if (!contentRange) { + this.abort( + new RequestRetryError('Content-Range mismatch', statusCode, { + headers, + count: this.retryCount + }) + ) + return false + } + + // Let's start with a weak etag check + if (this.etag != null && this.etag !== headers.etag) { + this.abort( + new RequestRetryError('ETag mismatch', statusCode, { + headers, + count: this.retryCount + }) + ) + return false + } + + const { start, size, end = size } = contentRange + + assert(this.start === start, 'content-range mismatch') + assert(this.end == null || this.end === end, 'content-range mismatch') + + this.resume = resume + return true + } + + if (this.end == null) { + if (statusCode === 206) { + // First time we receive 206 + const range = parseRangeHeader(headers['content-range']) + + if (range == null) { + return this.handler.onHeaders( + statusCode, + rawHeaders, + resume, + statusMessage + ) + } + + const { start, size, end = size } = range + + assert( + start != null && Number.isFinite(start) && this.start !== start, + 'content-range mismatch' + ) + assert(Number.isFinite(start)) + assert( + end != null && Number.isFinite(end) && this.end !== 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) { + const contentLength = headers['content-length'] + this.end = contentLength != null ? Number(contentLength) : null + } + + assert(Number.isFinite(this.start)) + assert( + this.end == null || Number.isFinite(this.end), + 'invalid content-length' + ) + + this.resume = resume + this.etag = headers.etag != null ? headers.etag : null + + return this.handler.onHeaders( + statusCode, + rawHeaders, + resume, + statusMessage + ) + } + + const err = new RequestRetryError('Request failed', statusCode, { + headers, + count: this.retryCount + }) + + this.abort(err) + + return false + } + + onData (chunk) { + this.start += chunk.length + + return this.handler.onData(chunk) + } + + onComplete (rawTrailers) { + this.retryCount = 0 + return this.handler.onComplete(rawTrailers) + } + + onError (err) { + if (this.aborted || isDisturbed(this.opts.body)) { + return this.handler.onError(err) + } + + this.retryOpts.retry( + err, + { + state: { counter: this.retryCount++, currentTimeout: this.retryAfter }, + opts: { retryOptions: this.retryOpts, ...this.opts } + }, + onRetry.bind(this) + ) + + function onRetry (err) { + if (err != null || this.aborted || isDisturbed(this.opts.body)) { + return this.handler.onError(err) + } + + if (this.start !== 0) { + this.opts = { + ...this.opts, + headers: { + ...this.opts.headers, + range: `bytes=${this.start}-${this.end ?? ''}` + } + } + } + + try { + this.dispatch(this.opts, this) + } catch (err) { + this.handler.onError(err) + } + } + } +} + +module.exports = RetryHandler |