ramda#map JavaScript Examples

export async function fetchRequestsByChainId({ chainId }) {
  const data = await client
    .query({
      TableName: requestsTable,
      IndexName: "byChainIdAndStatus",
      ...buildKeyConditionExpression({ chainId }),
    })
    .promise();

  return map(denormalizeData, data.Items);
}

referenceMap = {
  // each key is a "type" (but not the referenced _resource_ type, eg: "Practitioner")
  // each value operates on a FHIR resource, and returns an Array of reference Objects
  serviceProvider: compose(
    (result) => (result ? [result] : []),
    path(['serviceProvider']),
  ),
  requester: compose(
    (result) => (result ? [result] : []),
    path(['requester']), // may or may not be practitioner?
  ),
  participant: compose(
    map(path(['individual'])), // may or may not be practitioner?
    filter(hasPath(['individual', 'reference'])),
    propOr([], 'participant'),
  ),
}

NotificationStack = ({
	notifications,
	renderNotification,
	transition = defaultTransition,
	className,
	...otherProps
}) => (
	<Portal container={getParentContainer()} {...otherProps}>
		<TransitionGroup className={cx('notification-stack', className)}>
			{map(
				notification => (
					<CSSTransition key={`transition-${notification.id}`} {...transition}>
						<div>
							{renderNotification({
								...notification,
								key: `notification-${notification.id}`,
							})}
						</div>
					</CSSTransition>
				),
				notifications,
			)}
		</TransitionGroup>
	</Portal>
)

Box = forwardRef(
	(
		{
			children,
			as: Comp = 'div',
			className,
			display,
			hasStrictAttributes,
			elementProps,
			...rest
		},
		ref,
	) => (
		<Comp
			className={cx(
				...map(x => propToClassName(x)(rest[x]))(DIMENSIONS),
				displayToClassName(display),
				className,
			)}
			ref={ref}
			{...(hasStrictAttributes
				? omitInvalidProps(rest)
				: omit(DIMENSIONS, rest))}
			{...elementProps}
		>
			{children}
		</Comp>
	),
)

buildGenericConditionExpression = curry(function _buildGenericConditionExpression(exprAttr, obj) {
  const buildDescriptors = compose(
    map(([key, value]) => ({
      expr: `#${key} = :${key}`,
      name: { [`#${key}`]: key },
      value: { [`:${key}`]: value },
    })),
    toPairs
  );
  const descriptors = buildDescriptors(obj);

  const buildExpression = compose(join(" and "), pluck("expr"));
  const buildAttrNames = compose(mergeAll, pluck("name"));
  const buildAttrValues = compose(mergeAll, pluck("value"));

  const expression = buildExpression(descriptors);
  const attrNames = buildAttrNames(descriptors);
  const attrValues = buildAttrValues(descriptors);

  return {
    [exprAttr]: expression,
    ExpressionAttributeNames: attrNames,
    ExpressionAttributeValues: attrValues,
  };
})

export function buildSetUpdateExpression(obj) {
  const buildDescriptors = compose(
    map(([key, value]) => ({
      expr: `#${key} = :${key}`,
      name: { [`#${key}`]: key },
      value: { [`:${key}`]: value },
    })),
    toPairs
  );
  const descriptors = buildDescriptors(obj);

  const buildExpression = compose((expr) => `SET ${expr}`, join(", "), pluck("expr"));
  const buildAttrNames = compose(mergeAll, pluck("name"));
  const buildAttrValues = compose(mergeAll, pluck("value"));

  const expression = buildExpression(descriptors);
  const attrNames = buildAttrNames(descriptors);
  const attrValues = buildAttrValues(descriptors);

  return {
    UpdateExpression: expression,
    ExpressionAttributeNames: attrNames,
    ExpressionAttributeValues: attrValues,
  };
}

export function createEnhancedClient() {
  const params = process.env.IS_LOCAL
    ? {
        region: "localhost",
        endpoint: "http://localhost:8000",
      }
    : {};

  const client = new DynamoDB.DocumentClient(params);

  const writeSingleBatch = curry(function _writeSingleBatch(tableName, batch) {
    return client
      .batchWrite({
        RequestItems: {
          [tableName]: batch,
        },
      })
      .promise();
  });

  const writeAllBatches = function _writeAllBatches(tableName, items) {
    return compose(map(writeSingleBatch(tableName)), splitBatches)(items);
  };

  const batchWrite = curry(async function _batchWrite(tableName, items) {
    return flatten(await P.all(writeAllBatches(tableName, items)));
  });

  return {
    client,
    batchWrite,
  };
}

export async function fetchRequestsByChainIdAndStatus({ chainId, status }) {
  const data = await client
    .query({
      TableName: requestsTable,
      IndexName: "byChainIdAndStatus",
      ...buildKeyConditionExpression({ chainId, status }),
    })
    .promise();

  return map(denormalizeData, data.Items);
}

export async function deleteAllRequests() {
  const createDeleteRequest = (item) => ({
    DeleteRequest: {
      Key: item,
    },
  });

  const data = await fetchAllRequestIds();

  if (data.length === 0) {
    return;
  }

  return compose(
    batchWrite(requestsTable),
    map(compose(createDeleteRequest, pick(["requestId", "chainId"], normalizeData)))
  )(data);
}

export async function fetchAllRequestIds() {
  const data = await client
    .scan({
      TableName: requestsTable,
      ProjectionExpression: "requestId, chainId",
    })
    .promise();

  return map(denormalizeData, data.Items);
}

export async function saveRequests(requests) {
  const createPutRequest = (item) => ({
    PutRequest: {
      Item: item,
    },
  });

  const createBatchItem = compose(createPutRequest, extractStoredData, normalizeData);

  return compose(batchWrite(requestsTable), map(createBatchItem))(requests);
}

fetchErasInfo = async (api) => {
  const eras = await api.derive.staking.erasHistoric();
  const indexByEra = indexBy(o((era) => era.toString(), prop("era")));

  const [pointsByEra, rewardsByEra, prefsByEra] = await Promise.all([
    api.derive.staking._erasPoints(eras),
    api.derive.staking._erasRewards(eras),
    api.derive.staking._erasPrefs(eras),
  ]).then(map(indexByEra));

  return {
    eras,
    pointsByEra,
    rewardsByEra,
    prefsByEra,
  };
}

export default async function createApiInstance() {
  const [batchSend, foreignProxy] = await Promise.all([
    createBatchSend(web3, FOREIGN_TX_BATCHER_CONTRACT_ADDRESS),
    getContract(web3, ForeignProxy.abi, process.env.FOREIGN_PROXY_CONTRACT_ADDRESS),
  ]);

  async function getBlockNumber() {
    return Number(await web3.eth.getBlockNumber());
  }

  async function getChainId() {
    return Number(await web3.eth.getChainId());
  }

  async function getArbitrationRequest({ questionId, requester }) {
    const [arbitration, chainId] = await P.all([
      foreignProxy.methods.arbitrationRequests(questionId, requester).call(),
      getChainId(),
    ]);

    return {
      ...arbitration,
      chainId,
      questionId,
      requester,
      status: Number(arbitration.status),
    };
  }

  async function getRequestedArbitrations({ fromBlock = 0, toBlock = "latest" } = {}) {
    const events = await getPastEvents(foreignProxy, "ArbitrationRequested", { fromBlock, toBlock });

    const allNotifiedRequests = await P.allSettled(
      map(
        ({ returnValues }) =>
          getArbitrationRequest({
            questionId: returnValues._questionID,
            requester: returnValues._requester,
          }),
        events
      )
    );
    const onlyFulfilled = compose(filter(propEq("status", "fulfilled")), map(prop("value")));

    return into([], onlyFulfilled, allNotifiedRequests);
  }

  async function handleFailedDisputeCreation(arbitration) {
    await batchSend({
      args: [arbitration.questionId, arbitration.requester],
      method: foreignProxy.methods.handleFailedDisputeCreation,
      to: foreignProxy.options.address,
    });
    return arbitration;
  }

  return {
    getChainId,
    getBlockNumber,
    getArbitrationRequest,
    getRequestedArbitrations,
    handleFailedDisputeCreation,
  };
}

convertToDisplay = (property, defaultProperty, cssResponsiveValue) => {
	const getProperty = sanitizeCssValue(property)(defaultProperty);

	return cssResponsiveValue &&
		(isArray(cssResponsiveValue) || isPlainObject(cssResponsiveValue))
		? map(getProperty, cssResponsiveValue)
		: getProperty(cssResponsiveValue);
}

/**
 * Sends staking payouts for recent eras using the given sender account.
 *
 * @param {DockAPI} dock
 * @param {ErasInfo} erasInfo
 * @param {*} initiator - account to send tx from
 * @param {number} batchSize
 * @returns {Promise<boolean>} - `true` if some unpaid eras were found, `false` otherwise
 */
async function sendStakingPayouts(dock, erasInfo, initiator, batchSize) {
  const validators = pipe(
    values,
    pluck("validators"),
    chain(keys),
    (values) => new Set(values)
  )(erasInfo.pointsByEra);

  if (!validators.size) {
    console.log("- Validator set is empty.");
    return false;
  }

  console.log("- Retrieving validator eras...");
  const erasToBePaid = await lastValueFrom(
    from(validators).pipe(
      getUnclaimedStashesEras(dock.api, erasInfo),
      toArray()
    )
  );

  const rewards = pipe(buildValidatorRewards, toPairs)(erasInfo, erasToBePaid);

  if (isEmpty(rewards)) {
    console.log("- No unpaid validator rewards found for recent eras.");
    return false;
  }

  console.log("- Payouts need to be made:");

  for (const [stashId, eras] of rewards) {
    const total = eras.reduce(
      (total, { reward }) => (total != null ? total.add(reward) : reward),
      null
    );

    console.log(` * To \`${stashId}\`: ${formatDock(total)}`);
  }

  const logResult = ({ result, tx }) => {
    // Ther's a much better way to check this...
    const isBatch = tx.method.args?.[0]?.[0] instanceof Map;

    let msg = " * ";
    if (isBatch) msg += `Batch transaction`;
    else msg += `Transaction`;

    if (FinalizeTx) {
      msg += ` finalized at block \`${result.status.asFinalized}\`: `;
    } else {
      msg += ` included at block \`${result.status.asInBlock}\`: `;
    }

    const payoutsSummary = (isBatch ? tx.method.args[0] : [tx.method])
      .map((payout) => payout.get("args"))
      .map(
        ({ validator_stash, era }) =>
          `\`${validator_stash}\` rewarded for era ${era}`
      )
      .join(isBatch ? ",\n    " : ",");

    msg += isBatch ? `[\n    ${payoutsSummary}\n ]` : payoutsSummary;

    console.log(msg);
  };

  const payoutTxs$ = from(rewards).pipe(
    concatMap(([stashId, eras]) => from(eras.map(assoc("stashId", stashId)))),
    mapRx(({ stashId, era }) =>
      dock.api.tx.staking.payoutStakers(stashId, era)
    ),
    batchExtrinsics(dock.api, batchSize),
    signAndSendExtrinsics(dock, initiator),
    tap(logResult)
  );

  await new Promise((resolve, reject) =>
    payoutTxs$.subscribe({
      error: reject,
      complete: resolve,
    })
  );

  return true;
}

export default async function checkRequestedArbitrations({ foreignChainApi }) {
  const chainId = await foreignChainApi.getChainId();

  await checkUntrackedArbitrationRequests();
  await processArbitrationRequests();

  async function checkUntrackedArbitrationRequests() {
    const [fromBlock, toBlock] = await P.all([
      getBlockHeight("ACCEPTED_ARBITRATION_REQUESTS"),
      foreignChainApi.getBlockNumber(),
    ]);

    const untrackedArbitrationRequests = filter(
      ({ status }) => status !== status.None,
      await foreignChainApi.getRequestedArbitrations({ fromBlock, toBlock })
    );

    await saveRequests(untrackedArbitrationRequests);

    const blockHeight = toBlock + 1;
    await updateBlockHeight({ key: "ACCEPTED_ARBITRATION_REQUESTS", blockHeight });
    console.info({ blockHeight }, "Set ACCEPTED_ARBITRATION_REQUESTS block height");

    const stats = {
      data: map(pick(["questionId", "requester", "chainId", "status"]), untrackedArbitrationRequests),
      fromBlock,
      toBlock,
    };

    console.info(stats, "Found new notified arbitration requests");

    return stats;
  }

  async function processArbitrationRequests() {
    const requestRemovedOrRuled = ([_, onChainArbitration]) =>
      [Status.None, Status.Ruled].includes(onChainArbitration.status);
    const removeOffChainRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      removeRequest,
      (arbitration) => ({
        action: "ARBITRATION_REQUEST_REMOVED",
        payload: arbitration,
      }),
    ]);

    const disputeCreationFailed = ([_, onChainArbitration]) => onChainArbitration.status === Status.Failed;
    const handleFailedDisputeCreation = asyncPipe([
      mergeOnChainOntoOffChain,
      foreignChainApi.handleFailedDisputeCreation,
      (arbitration) => ({
        action: "FAILED_DISPUTE_CREATION_HANDLED",
        payload: arbitration,
      }),
    ]);

    const requestStatusChanged = ([offChainArbitration, onChainArbitration]) =>
      offChainArbitration.status != onChainArbitration.status;
    const updateOffChainRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      updateRequest,
      (arbitration) => ({
        action: "STATUS_CHANGED",
        payload: arbitration,
      }),
    ]);

    const noop = asyncPipe([
      mergeOnChainOntoOffChain,
      (arbtration) => ({
        action: "NO_OP",
        payload: arbtration,
      }),
    ]);

    const pipeline = asyncPipe([
      fetchOnChainCounterpart,
      cond([
        [requestRemovedOrRuled, removeOffChainRequest],
        [disputeCreationFailed, handleFailedDisputeCreation],
        [requestStatusChanged, updateOffChainRequest],
        [() => true, noop],
      ]),
    ]);

    const requestedArbitrations = await fetchRequestsByChainId({ chainId });

    console.info(
      { data: map(pick(["questionId", "requester"]), requestedArbitrations) },
      "Fetched requested arbitrations"
    );

    const results = await P.allSettled(map(pipeline, requestedArbitrations));

    const groupQuestionsOrErrorMessage = (acc, r) => {
      if (r.status === "rejected") {
        return [...acc, r.reason?.message];
      }

      const questionId = r.value?.payload?.questionId ?? "<not set>";
      const requester = r.value?.payload?.requester ?? "<not set>";
      return [...acc, { questionId, requester }];
    };
    const toTag = (r) => (r.status === "rejected" ? "FAILURE" : r.value?.action);
    const stats = reduceBy(groupQuestionsOrErrorMessage, [], toTag, results);

    console.info(stats, "Processed requested arbitrations");

    return stats;
  }

  async function fetchOnChainCounterpart(offChainArbitration) {
    const { questionId, requester } = offChainArbitration;

    const onChainArbitration = await foreignChainApi.getArbitrationRequest({ questionId, requester });

    return [offChainArbitration, onChainArbitration];
  }
}

export default async function checkRejectedRequests({ homeChainApi }) {
  const chainId = await homeChainApi.getChainId();

  await checkUntrackedRejectedRequests();
  await checkCurrentRejectedRequests();

  async function checkUntrackedRejectedRequests() {
    const [fromBlock, toBlock] = await Promise.all([
      getBlockHeight("REJECTED_REQUESTS"),
      homeChainApi.getBlockNumber(),
    ]);

    const untrackedRejectedRequests = filter(
      ({ status }) => status === Status.Rejected,
      await homeChainApi.getRejectedRequests({ fromBlock, toBlock })
    );

    await saveRequests(untrackedRejectedRequests);

    const blockHeight = toBlock + 1;
    await updateBlockHeight({ key: "REJECTED_REQUESTS", blockHeight });
    console.info({ blockHeight }, "Set REJECTED_REQUESTS block height");

    const stats = {
      data: map(pick(["questionId", "requester"]), untrackedRejectedRequests),
      fromBlock,
      toBlock,
    };

    console.info(stats, "Found new rejected arbitration requests");

    return stats;
  }

  async function checkCurrentRejectedRequests() {
    const requestRemoved = ([_, onChainArbitration]) => onChainArbitration.status === Status.None;
    const removeOffChainRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      removeRequest,
      (arbitration) => ({
        action: "REQUEST_REMOVED",
        payload: arbitration,
      }),
    ]);

    const requestRejected = ([_, onChainArbitration]) => onChainArbitration.status === Status.Rejected;
    const handleRejectedRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      homeChainApi.handleRejectedRequest,
      (request) => ({
        action: "REJECTED_REQUEST_HANDLED",
        payload: request,
      }),
    ]);

    const noop = asyncPipe([
      mergeOnChainOntoOffChain,
      (request) => ({
        action: "NO_OP",
        payload: request,
      }),
    ]);

    const pipeline = asyncPipe([
      fetchOnChainCounterpart,
      cond([
        [requestRemoved, removeOffChainRequest],
        [requestRejected, handleRejectedRequest],
        [() => true, noop],
      ]),
    ]);

    const rejectedRequests = await fetchRequestsByChainIdAndStatus({ chainId, status: Status.Rejected });

    console.info({ data: map(pick(["questionId", "requester"]), rejectedRequests) }, "Fetched rejected requests");

    const results = await P.allSettled(map(pipeline, rejectedRequests));

    const groupQuestionsOrErrorMessage = (acc, r) => {
      if (r.status === "rejected") {
        return [...acc, r.reason?.message];
      }

      const questionId = r.value?.payload?.questionId ?? "<not set>";
      const requester = r.value?.payload?.requester ?? "<not set>";
      return [...acc, { questionId, requester }];
    };
    const toTag = (r) => (r.status === "rejected" ? "FAILURE" : r.value?.action);
    const stats = reduceBy(groupQuestionsOrErrorMessage, [], toTag, results);

    console.info(stats, "Processed rejected requests");

    return stats;
  }

  async function fetchOnChainCounterpart(offChainRequest) {
    const { questionId, requester } = offChainRequest;

    const onChainRequest = await homeChainApi.getRequest({ questionId, requester });

    return [offChainRequest, onChainRequest];
  }
}

export default async function createApiInstance() {
  const [batchSend, homeProxy, realitio] = await Promise.all([
    createBatchSend(web3, HOME_TX_BATCHER_CONTRACT_ADDRESS),
    getContract(web3, HomeProxy.abi, process.env.HOME_PROXY_CONTRACT_ADDRESS),
    getContract(web3, RealitioInterface.abi, process.env.HOME_REALITIO_CONTRACT_ADDRESS),
  ]);

  async function getBlockNumber() {
    return Number(await web3.eth.getBlockNumber());
  }

  async function getChainId() {
    return Number(await web3.eth.getChainId());
  }

  async function getRequest({ questionId, requester }) {
    const [request, chainId] = await Promise.all([
      homeProxy.methods.requests(questionId, requester).call(),
      getChainId(),
    ]);

    return {
      ...request,
      chainId,
      questionId,
      requester,
      status: Number(request.status),
    };
  }

  async function getNotifiedRequests({ fromBlock = 0, toBlock = "latest" } = {}) {
    const events = await getPastEvents(homeProxy, "RequestNotified", { fromBlock, toBlock });

    const allNotifiedRequests = await P.allSettled(
      map(
        ({ returnValues }) =>
          getRequest({
            questionId: returnValues._questionID,
            requester: returnValues._requester,
          }),
        events
      )
    );

    const onlyFulfilled = compose(filter(propEq("status", "fulfilled")), map(prop("value")));

    return into([], onlyFulfilled, allNotifiedRequests);
  }

  async function getRejectedRequests({ fromBlock = 0, toBlock = "latest" } = {}) {
    const events = await getPastEvents(homeProxy, "RequestRejected", { fromBlock, toBlock });

    const allRejectedRequests = await P.allSettled(
      map(
        ({ returnValues }) =>
          getRequest({
            questionId: returnValues._questionID,
            requester: returnValues._requester,
          }),
        events
      )
    );
    const onlyFulfilled = compose(filter(propEq("status", "fulfilled")), map(prop("value")));

    return into([], onlyFulfilled, allRejectedRequests);
  }

  async function handleNotifiedRequest(request) {
    await batchSend({
      args: [request.questionId, request.requester],
      method: homeProxy.methods.handleNotifiedRequest,
      to: homeProxy.options.address,
    });
    return request;
  }

  async function handleChangedAnswer(request) {
    await batchSend({
      args: [request.questionId, request.requester],
      method: homeProxy.methods.handleChangedAnswer,
      to: homeProxy.options.address,
    });
    return request;
  }

  async function handleFinalizedQuestion(request) {
    await batchSend({
      args: [request.questionId, request.requester],
      method: homeProxy.methods.handleFinalizedQuestion,
      to: homeProxy.options.address,
    });
    return request;
  }

  async function handleRejectedRequest(request) {
    await batchSend({
      args: [request.questionId, request.requester],
      method: homeProxy.methods.handleRejectedRequest,
      to: homeProxy.options.address,
    });
    return request;
  }

  async function reportArbitrationAnswer(request) {
    const { questionId } = request;
    const { historyHash, answerOrCommitmentID, answerer } = await _getLatestAnswerParams(questionId);

    await batchSend({
      args: [questionId, historyHash, answerOrCommitmentID, answerer],
      method: homeProxy.methods.reportArbitrationAnswer,
      to: homeProxy.options.address,
    });
    return request;
  }

  async function _getLatestAnswerParams(questionId) {
    const answers = await getPastEvents(realitio, "LogNewAnswer", {
      filter: {
        question_id: questionId,
      },
    });

    if (answers.length == 0) {
      throw new Error(`Question ${questionId} was never answered`);
    }

    const byMostRecentBlock = descend(prop("blockNumber"));
    const sortedAnswers = sort(byMostRecentBlock, answers);

    const latestAnswer = sortedAnswers[0].returnValues;
    const previousAnswer = sortedAnswers[1]?.returnValues;

    return {
      historyHash: previousAnswer?.history_hash ?? ZERO_HASH,
      answerOrCommitmentID: latestAnswer.answer,
      answerer: latestAnswer.user,
    };
  }

  return {
    getBlockNumber,
    getChainId,
    getNotifiedRequests,
    getRejectedRequests,
    getRequest,
    handleChangedAnswer,
    handleFinalizedQuestion,
    handleNotifiedRequest,
    handleRejectedRequest,
    reportArbitrationAnswer,
  };
}

export default async function checkNotifiedRequests({ homeChainApi }) {
  const chainId = await homeChainApi.getChainId();

  await checkUntrackedNotifiedRequests();
  await checkCurrentNotifiedRequests();

  async function checkUntrackedNotifiedRequests() {
    const [fromBlock, toBlock] = await P.all([getBlockHeight("NOTIFIED_REQUESTS"), homeChainApi.getBlockNumber()]);

    const untrackedNotifiedRequests = filter(
      ({ status }) => status !== Status.None,
      await homeChainApi.getNotifiedRequests({ fromBlock, toBlock })
    );

    await saveRequests(untrackedNotifiedRequests);

    const blockHeight = toBlock + 1;
    await updateBlockHeight({ key: "NOTIFIED_REQUESTS", blockHeight });
    console.info({ blockHeight }, "Set NOTIFIED_REQUESTS block height");

    const stats = {
      data: map(pick(["questionId", "chainId", "status"]), untrackedNotifiedRequests),
      fromBlock,
      toBlock,
    };

    console.info(stats, "Found new notified arbitration requests");

    return stats;
  }

  async function checkCurrentNotifiedRequests() {
    const requestNotified = ([_, onChainArbitration]) => onChainArbitration.status === Status.Notified;
    const handleNotifiedRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      homeChainApi.handleNotifiedRequest,
      (request) => ({
        action: "NOTIFIED_REQUEST_HANDLED",
        payload: request,
      }),
    ]);

    const requestStatusChanged = ([offChainRequest, onChainRequest]) => offChainRequest.status != onChainRequest.status;
    const updateOffChainRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      updateRequest,
      (request) => ({
        action: "STATUS_CHANGED",
        payload: request,
      }),
    ]);

    const noop = asyncPipe([
      mergeOnChainOntoOffChain,
      (request) => ({
        action: "NO_OP",
        payload: request,
      }),
    ]);

    const pipeline = asyncPipe([
      fetchOnChainCounterpart,
      cond([
        [requestNotified, handleNotifiedRequest],
        [requestStatusChanged, updateOffChainRequest],
        [() => true, noop],
      ]),
    ]);

    const notifiedRequests = await fetchRequestsByChainIdAndStatus({ status: Status.Notified, chainId });

    console.info({ data: map(pick(["questionId", "requester"]), notifiedRequests) }, "Fetched notified requests");

    const results = await P.allSettled(map(pipeline, notifiedRequests));

    const groupQuestionsOrErrorMessage = (acc, r) => {
      if (r.status === "rejected") {
        return [...acc, r.reason?.message];
      }

      const questionId = r.value?.payload?.questionId ?? "<not set>";
      const requester = r.value?.payload?.requester ?? "<not set>";
      return [...acc, { questionId, requester }];
    };
    const toTag = (r) => (r.status === "rejected" ? "FAILURE" : r.value?.action);
    const stats = reduceBy(groupQuestionsOrErrorMessage, [], toTag, results);

    console.info(stats, "Processed notified requests");

    return stats;
  }

  async function fetchOnChainCounterpart(offChainRequest) {
    const { questionId, requester } = offChainRequest;

    const onChainRequest = await homeChainApi.getRequest({ questionId, requester });

    return [offChainRequest, onChainRequest];
  }
}

export default async function checkArbitratorAnswers({ homeChainApi }) {
  const chainId = await homeChainApi.getChainId();

  await checkUntrackedArbitratorAnswers();
  await checkCurrentArbitratorAnswers();

  async function checkUntrackedArbitratorAnswers() {
    const [fromBlock, toBlock] = await P.all([getBlockHeight("RULED_REQUESTS"), homeChainApi.getBlockNumber()]);

    const untrackedNotifiedRequests = filter(
      ({ status }) => [Status.AwaitingRuling, Status.Ruled].includes(status),
      await homeChainApi.getNotifiedRequests({ fromBlock, toBlock })
    );

    await saveRequests(untrackedNotifiedRequests);

    const blockHeight = toBlock + 1;
    await updateBlockHeight({ key: "RULED_REQUESTS", blockHeight });
    console.info({ blockHeight }, "Set RULED_REQUESTS block height");

    const stats = {
      data: map(pick(["questionId", "chainId"]), untrackedNotifiedRequests),
      fromBlock,
      toBlock,
    };

    console.info(stats, "Found new requests with arbitrator answers");

    return stats;
  }

  async function checkCurrentArbitratorAnswers() {
    const requestFinishedOrCanceled = ([_, onChainRequest]) =>
      [Status.None, Status.Finished].includes(onChainRequest.status);
    const removeOffChainRequest = asyncPipe([
      mergeOnChainOntoOffChain,
      removeRequest,
      (request) => ({
        action: "OFF_CHAIN_REQUEST_REMOVED",
        payload: request,
      }),
    ]);

    const requestRuled = ([_, onChainArbitration]) => onChainArbitration.status === Status.Ruled;
    const reportArbitrationAnswer = asyncPipe([
      mergeOnChainOntoOffChain,
      homeChainApi.reportArbitrationAnswer,
      (request) => ({
        action: "ARBITRATION_ANSWER_REPORTED",
        payload: request,
      }),
    ]);

    const noop = asyncPipe([
      mergeOnChainOntoOffChain,
      (arbtration) => ({
        action: "NO_OP",
        payload: arbtration,
      }),
    ]);

    const requestsWithRuling = await fetchRequestsByChainId({ status: Status.Ruled, chainId });

    console.info(
      { data: map(pick(["questionId", "requester"]), requestsWithRuling) },
      "Fetched requests which received the arbitration ruling"
    );

    const pipeline = asyncPipe([
      fetchOnChainCounterpart,
      cond([
        [requestFinishedOrCanceled, removeOffChainRequest],
        [requestRuled, reportArbitrationAnswer],
        [() => true, noop],
      ]),
    ]);

    const results = await P.allSettled(map(pipeline, requestsWithRuling));

    const groupQuestionsOrErrorMessage = (acc, r) => {
      if (r.status === "rejected") {
        return [...acc, r.reason?.message];
      }

      const questionId = r.value?.payload?.questionId ?? "<not set>";
      const requester = r.value?.payload?.requester ?? "<not set>";
      return [...acc, { questionId, requester }];
    };
    const toTag = (r) => (r.status === "rejected" ? "FAILURE" : r.value?.action);
    const stats = reduceBy(groupQuestionsOrErrorMessage, [], toTag, results);

    console.info(stats, "Processed requests with ruling");
  }

  async function fetchOnChainCounterpart(offChainRequest) {
    const { questionId, requester } = offChainRequest;

    const onChainRequest = await homeChainApi.getRequest({ questionId, requester });

    return [offChainRequest, onChainRequest];
  }
}