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import {
SignedDataPackage,
SignedDataPackagePlainObj,
} from "@redstone-finance/protocol";
import { MathUtils, RedstoneCommon, SafeNumber } from "@redstone-finance/utils";
import axios from "axios";
import { BigNumber } from "ethers";
import { z } from "zod";
import { resolveDataServiceUrls } from "./data-services-urls";
const GET_REQUEST_TIMEOUT = 5_000;
const DEFAULT_WAIT_FOR_ALL_GATEWAYS_TIME = 500;
const MILLISECONDS_IN_ONE_MINUTE = 60 * 1000;
export interface DataPackagesRequestParams {
dataServiceId: string;
uniqueSignersCount: number;
waitForAllGatewaysTimeMs?: number;
maxTimestampDeviationMS?: number;
authorizedSigners?: string[];
dataFeeds: string[];
urls?: string[];
historicalTimestamp?: number;
}
export interface DataPackagesResponse {
[dataFeedId: string]: SignedDataPackage[] | undefined;
}
export interface ValuesForDataFeeds {
[dataFeedId: string]: BigNumber | undefined;
}
const GwResponseSchema = z.record(
z.string(),
z.array(
z.object({
dataPoints: z
.array(
z
.object({
dataFeedId: z.string(),
value: z.number(),
decimals: z.number().optional(),
})
.or(
z.object({
dataFeedId: z.string(),
value: z.string(),
decimals: z.number().optional(),
})
)
)
.min(1),
timestampMilliseconds: z.number(),
signature: z.string(),
dataFeedId: z.string(),
})
)
);
export type GwResponse = Partial<z.infer<typeof GwResponseSchema>>;
export const getDataServiceIdForSigner = (
oracleState: RedstoneOraclesState,
signerAddress: string
) => {
for (const nodeDetails of Object.values(oracleState.nodes)) {
Iif (nodeDetails.evmAddress.toLowerCase() === signerAddress.toLowerCase()) {
return nodeDetails.dataServiceId;
}
}
throw new Error(`Data service not found for ${signerAddress}`);
};
export const calculateHistoricalPackagesTimestamp = (
deviationCheckOffsetInMinutes: number,
baseTimestamp: number = Date.now()
) => {
if (deviationCheckOffsetInMinutes > 0) {
// We round the timestamp to full minutes for being compatible with
// oracle-nodes, which usually work with rounded 10s and 60s intervals
return (
Math.floor(
baseTimestamp / MILLISECONDS_IN_ONE_MINUTE -
deviationCheckOffsetInMinutes
) * MILLISECONDS_IN_ONE_MINUTE
);
}
return undefined;
};
export const requestDataPackages = async (
reqParams: DataPackagesRequestParams
): Promise<DataPackagesResponse> => {
Iif (reqParams.dataFeeds.length < 1) {
throw new Error("Please provide at least one dataFeed");
}
try {
const promises = prepareDataPackagePromises(reqParams);
Iif (reqParams.historicalTimestamp) {
return await Promise.any(promises);
}
return await getTheMostRecentDataPackages(
promises,
reqParams.waitForAllGatewaysTimeMs
);
} catch (e) {
const errMessage = `Request failed ${JSON.stringify({
reqParams,
})}, Original error: ${RedstoneCommon.stringifyError(e)}`;
throw new Error(errMessage);
}
};
const getTheMostRecentDataPackages = (
promises: Promise<DataPackagesResponse>[],
waitForAllGatewaysTimeMs = DEFAULT_WAIT_FOR_ALL_GATEWAYS_TIME
): Promise<DataPackagesResponse> => {
return new Promise((resolve, reject) => {
const collectedResponses: DataPackagesResponse[] = [];
const errors: Error[] = [];
let waitForAll = true;
const timer = setTimeout(() => {
waitForAll = false;
checkResults();
}, waitForAllGatewaysTimeMs);
const checkResults = () => {
if (errors.length === promises.length) {
clearTimeout(timer);
reject(new AggregateError(errors));
} else if (
collectedResponses.length + errors.length === promises.length ||
(!waitForAll && collectedResponses.length !== 0)
) {
const newestPackage = collectedResponses.reduce((a, b) => {
const aTimestamp =
Object.values(a).at(0)?.at(0)?.dataPackage.timestampMilliseconds ??
0;
const bTimestamp =
Object.values(b).at(0)?.at(0)?.dataPackage.timestampMilliseconds ??
0;
return bTimestamp > aTimestamp ? b : a;
});
clearTimeout(timer);
resolve(newestPackage);
}
};
for (const promise of promises) {
promise
.then((r) => collectedResponses.push(r))
.catch((e) => errors.push(e as Error))
.finally(checkResults);
}
});
};
const prepareDataPackagePromises = (
reqParams: DataPackagesRequestParams
): Promise<DataPackagesResponse>[] => {
Iif (reqParams.authorizedSigners && reqParams.authorizedSigners.length == 0) {
throw new Error("authorizer signers array, if provided, cannot be empty");
}
const urls = getUrlsForDataServiceId(reqParams);
const pathComponents = [
"data-packages",
reqParams.historicalTimestamp ? "historical" : "latest",
reqParams.dataServiceId,
];
Iif (reqParams.historicalTimestamp) {
pathComponents.push(`${reqParams.historicalTimestamp}`);
}
return urls.map((url) =>
sendRequestToGateway(url, pathComponents, reqParams).then((response) =>
parseAndValidateDataPackagesResponse(response.data, reqParams)
)
);
};
const parseAndValidateDataPackagesResponse = (
responseData: unknown,
reqParams: DataPackagesRequestParams
): DataPackagesResponse => {
const parsedResponse: DataPackagesResponse = {};
RedstoneCommon.zodAssert<GwResponse>(GwResponseSchema, responseData);
const requestedDataFeedIds = reqParams.dataFeeds;
for (const dataFeedId of requestedDataFeedIds) {
let dataFeedPackages = responseData[dataFeedId];
if (!dataFeedPackages) {
throw new Error(
`Requested data feed id is not included in response: ${dataFeedId}`
);
}
// filter out packages with not expected signers
if (reqParams.authorizedSigners) {
dataFeedPackages = dataFeedPackages.filter((dp) => {
const signer = maybeGetSigner(dp);
if (!signer) {
return false;
}
return reqParams.authorizedSigners!.includes(signer);
});
}
// filter out package with deviated timestamps
if (reqParams.maxTimestampDeviationMS) {
const now = Date.now();
dataFeedPackages = dataFeedPackages.filter(
(dp) =>
Math.abs(now - dp.timestampMilliseconds) <
reqParams.maxTimestampDeviationMS!
);
}
if (dataFeedPackages.length < reqParams.uniqueSignersCount) {
throw new Error(
`Too few unique signers for the data feed: ${dataFeedId}. ` +
`Expected: ${reqParams.uniqueSignersCount}. ` +
`Received: ${dataFeedPackages.length}`
);
}
parsedResponse[dataFeedId] = pickDataFeedPackagesClosestToMedian(
dataFeedPackages,
reqParams.uniqueSignersCount
);
}
return parsedResponse;
};
const pickDataFeedPackagesClosestToMedian = (
dataFeedPackages: SignedDataPackagePlainObj[],
count: number
): SignedDataPackage[] => {
const median = MathUtils.getMedian(
dataFeedPackages.map((dp) => dp.dataPoints[0].value)
);
return sortByDistanceFromMedian(dataFeedPackages, median)
.map((diff) => SignedDataPackage.fromObj(diff.dp))
.slice(0, count);
};
function sendRequestToGateway(
url: string,
pathComponents: string[],
reqParams: DataPackagesRequestParams
) {
const sanitizedUrl = [url.replace(/\/+$/, "")]
.concat(pathComponents)
.join("/");
return axios.get<Record<string, SignedDataPackagePlainObj[]>>(sanitizedUrl, {
timeout: GET_REQUEST_TIMEOUT,
params: {
dataFeedIds: reqParams.dataFeeds,
minimalSignersCount: reqParams.uniqueSignersCount,
},
paramsSerializer: { indexes: null },
});
}
function maybeGetSigner(dp: SignedDataPackagePlainObj) {
try {
return SignedDataPackage.fromObj(dp).recoverSignerAddress();
} catch {
return undefined;
}
}
function sortByDistanceFromMedian(
dataFeedPackages: SignedDataPackagePlainObj[],
median: number
) {
return dataFeedPackages
.map((dp) => ({
dp: dp,
diff: SafeNumber.createSafeNumber(dp.dataPoints[0].value)
.sub(median)
.abs(),
}))
.sort((first, second) => first.diff.sub(second.diff).unsafeToNumber());
}
const getUrlsForDataServiceId = (
reqParams: DataPackagesRequestParams
): string[] => {
if (reqParams.urls) {
return reqParams.urls;
}
return resolveDataServiceUrls(reqParams.dataServiceId);
};
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