ramda#filter JavaScript Examples

processOrderBookSnapshot = (orderBookData, snapshotOrderbook) => {
  const { lastUpdateId, bids, asks } = snapshotOrderbook;

  // clean the order that is out of date
  const cleanOutOfDateOrder = (order) => order[2] > lastUpdateId;
  orderBookData.bid = filter(cleanOutOfDateOrder, orderBookData.bid);
  orderBookData.ask = filter(cleanOutOfDateOrder, orderBookData.ask);

  // append the updateId into snapshotOrderbook
  const snapshotOrders = appendUpdatedId(lastUpdateId, asks, bids);
  const compareValueFn = cond([
    [equals('ask'), () => (a, b) => (new Big(a[0])).minus(b[0])],
    [equals('bid'), () => (a, b) => (new Big(b[0])).minus(a[0])],
  ]);

  const validateValue = (v) => Big(v[0]);
  orderBookData.bid = uniqBy(validateValue, [...snapshotOrders[1], ...orderBookData.bid])
    .sort(compareValueFn('bid'), orderBookData.bid);

  orderBookData.ask = uniqBy(validateValue, [...snapshotOrders[0], ...orderBookData.ask])
    .sort(compareValueFn('ask'), orderBookData.ask);


  return orderBookData;
}

processOrderBookUpdate = (data, bid, ask) => {
  const validateValue = (v) => Big(v[0]);
  const compareValueFn = cond([
    [equals('ask'), () => (a, b) => (new Big(a[0])).minus(b[0])],
    [equals('bid'), () => (a, b) => (new Big(b[0])).minus(a[0])],
  ]);
  const purgeEmptyVolume = (v) => Big(v[1]).gt(0);

  data.bid = uniqBy(validateValue, [...bid, ...data.bid])
    .sort(compareValueFn('bid'), data.bid)
    .filter(purgeEmptyVolume, data.bid);

  data.ask = uniqBy(validateValue, [...ask, ...data.ask])
    .sort(compareValueFn('ask'), data.ask)
    .filter(purgeEmptyVolume, data.ask);
  return data;
}

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'),
  ),
}

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,
  };
}

performSearch = (state, { searchTerm }) => {
  const results = filter(startsWith(searchTerm), LIST_DATA)
  return state.merge({ searching: true, searchTerm, results })
}

omitInvalidProps = compose(
	fromPairs,
	// filter only event handlers and data-attributes.
	// Due to backwards compatibily we can't use `elementProps`
	filter(([prop]) => test(/^(on|data-|role|aria-)/, prop)),
	toPairs,
)

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];
  }
}

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 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 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 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,
  };
}