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{ createAsyncMiddleware, JsonRpcMiddleware } from 'json-rpc-engine';\nimport { EthereumRpcError, ethErrors } from 'eth-rpc-errors';\nimport { Payload, Block } from './utils/cache';\n\n/* eslint-disable node/global-require,@typescript-eslint/no-require-imports */\nconst fetch = global.fetch || require('node-fetch');\nconst btoa = global.btoa || require('btoa');\n/* eslint-enable node/global-require,@typescript-eslint/no-require-imports */\n\nconst RETRIABLE_ERRORS: string[] = [\n // ignore server overload errors\n 'Gateway timeout',\n 'ETIMEDOUT',\n // ignore server sent html error pages\n // or truncated json responses\n 'failed to parse response body',\n // ignore errors where http req failed to establish\n 'Failed to fetch',\n];\n\ninterface PayloadwithOrgin extends Payload {\n origin?: string;\n}\ninterface Request {\n method: string;\n headers: Record<string, string>;\n body: string;\n}\ninterface FetchConfig {\n fetchUrl: string;\n fetchParams: Request;\n}\ninterface FetchMiddlewareOptions {\n rpcUrl: string;\n originHttpHeaderKey?: string;\n}\n\ninterface FetchMiddlewareFromReqOptions extends FetchMiddlewareOptions {\n req: PayloadwithOrgin;\n}\n\nexport function createFetchMiddleware({\n rpcUrl,\n originHttpHeaderKey,\n}: FetchMiddlewareOptions): JsonRpcMiddleware<string[], Block> {\n return createAsyncMiddleware(async (req, res, _next) => {\n const { fetchUrl, fetchParams } = createFetchConfigFromReq({\n req,\n rpcUrl,\n originHttpHeaderKey,\n });\n\n // attempt request multiple times\n const maxAttempts = 5;\n const retryInterval = 1000;\n for (let attempt = 0; attempt < maxAttempts; attempt++) {\n try {\n const fetchRes: Response = await fetch(fetchUrl, fetchParams);\n // check for http errrors\n checkForHttpErrors(fetchRes);\n // parse response body\n const rawBody: string = await fetchRes.text();\n let fetchBody: Record<string, Block>;\n try {\n fetchBody = JSON.parse(rawBody);\n } catch (_) {\n throw new Error(\n `FetchMiddleware - failed to parse response body: \"${rawBody}\"`,\n );\n }\n const result: Block = parseResponse(fetchRes, fetchBody);\n // set result and exit retry loop\n res.result = result;\n return;\n } catch (err) {\n const errMsg: string = err.toString();\n const isRetriable: boolean = RETRIABLE_ERRORS.some((phrase) => errMsg.includes(phrase));\n // re-throw error if not retriable\n if (!isRetriable) {\n throw err;\n }\n }\n // delay before retrying\n await timeout(retryInterval);\n }\n });\n}\n\nfunction checkForHttpErrors(fetchRes: Response): void {\n // check for errors\n switch (fetchRes.status) {\n case 405:\n throw ethErrors.rpc.methodNotFound();\n\n case 418:\n throw createRatelimitError();\n\n case 503:\n case 504:\n throw createTimeoutError();\n\n default:\n break;\n }\n}\n\nfunction parseResponse(fetchRes: Response, body: Record<string, Block>): Block {\n // check for error code\n if (fetchRes.status !== 200) {\n throw ethErrors.rpc.internal({\n message: `Non-200 status code: '${fetchRes.status}'`,\n data: body,\n });\n }\n // check for rpc error\n if (body.error) {\n throw ethErrors.rpc.internal({\n data: body.error,\n });\n }\n // return successful result\n return body.result;\n}\n\nexport function createFetchConfigFromReq({\n req,\n rpcUrl,\n originHttpHeaderKey,\n}: FetchMiddlewareFromReqOptions): FetchConfig {\n const parsedUrl: URL = new URL(rpcUrl);\n const fetchUrl: string = normalizeUrlFromParsed(parsedUrl);\n\n // prepare payload\n // copy only canonical json rpc properties\n const payload: Payload = {\n id: req.id,\n jsonrpc: req.jsonrpc,\n method: req.method,\n params: req.params,\n };\n\n // extract 'origin' parameter from request\n const originDomain: string | undefined = req.origin;\n\n // serialize request body\n const serializedPayload: string = JSON.stringify(payload);\n\n // configure fetch params\n const fetchParams: Request = {\n method: 'POST',\n headers: {\n Accept: 'application/json',\n 'Content-Type': 'application/json',\n },\n body: serializedPayload,\n };\n\n // encoded auth details as header (not allowed in fetch url)\n if (parsedUrl.username && parsedUrl.password) {\n const authString = `${parsedUrl.username}:${parsedUrl.password}`;\n const encodedAuth = btoa(authString);\n fetchParams.headers.Authorization = `Basic ${encodedAuth}`;\n }\n\n // optional: add request origin as header\n if (originHttpHeaderKey && originDomain) {\n fetchParams.headers[originHttpHeaderKey] = originDomain;\n }\n\n return { fetchUrl, fetchParams };\n}\n\nfunction normalizeUrlFromParsed(parsedUrl: URL): string {\n let result = '';\n result += parsedUrl.protocol;\n result += `//${parsedUrl.hostname}`;\n if (parsedUrl.port) {\n result += `:${parsedUrl.port}`;\n }\n result += `${parsedUrl.pathname}`;\n return result;\n}\n\nfunction createRatelimitError(): EthereumRpcError<unknown> {\n return ethErrors.rpc.internal({ message: `Request is being rate limited.` });\n}\n\nfunction createTimeoutError(): EthereumRpcError<unknown> {\n let msg = `Gateway timeout. The request took too long to process. `;\n msg += `This can happen when querying logs over too wide a block range.`;\n return ethErrors.rpc.internal({ message: msg });\n}\n\nfunction timeout(duration: number): Promise<NodeJS.Timeout> {\n return new Promise((resolve) => setTimeout(resolve, duration));\n}\n"]} |