ramda#sort 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  // clean the order that is out of date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;
}

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,
  };
}