appbaseio/dejaVu

import { search } from '../apis';

let jsonData = [];

export const MAX_DATA = 100000;

const defaultQuery = {
    query: {
        match_all: {},
    },
};

/**
 * A function to convert multilevel object to single level object and use key value pairs as Column and row pairs using recursion
 */
export const flatten = data => {
    const result = {};

    function recurse(cur, prop = '') {
        if (Object(cur) !== cur) {
            result[prop] = cur;
        } else if (Array.isArray(cur)) {
            result[prop] = JSON.stringify(cur);
        } else {
            let isEmpty = true;
            Object.keys(cur).forEach(p => {
                isEmpty = false;
                recurse(cur[p], prop ? `${prop}.${p}` : p);
            });
            if (isEmpty && prop) {
                result[prop] = {};
            }
        }
    }

    recurse(data);
    return result;
};

export const searchAfter = async (
    app,
    types,
    url,
    version,
    query,
    chunkInfo,
    searchAfterData,
) => {
    try {
        const others = {};
        if (searchAfterData) {
            others.search_after = [searchAfterData];
        }
        const sortKey = version > 5 ? '_id' : '_uid';
        const data = await search(app, types, url, version, {
            ...query,
            size: 1000,
            sort: [
                {
                    [sortKey]: 'desc',
                },
            ],
            ...others,
        });

        // eslint-disable-next-line
        const res = await getSearchAfterData(
            app,
            types,
            url,
            version,
            query,
            chunkInfo,
            searchAfterData,
            data,
        );

        if (typeof res === 'string') {
            let exportData = JSON.parse(res);
            const lastObject = exportData[exportData.length - 1];
            exportData = exportData.map(value => {
                const item = Object.assign(value._source);
                item['_id'] = value._id;
                return item;
            });

            return {
                data: exportData,
                searchAfter:
                    version > 5
                        ? lastObject._id
                        : `${lastObject._type}#${lastObject._id}`,
            };
        }

        return res;
    } catch (e) {
        console.error('SEARCH ERROR', e);
        return e;
    }
};

const getSearchAfterData = async (
    app,
    types,
    url,
    version,
    query,
    chunkInfo,
    searchAfterData,
    data,
) => {
    const { hits } = data;
    let str = null;
    /**
     * Checking if the current length is less than chunk total, recursive call searchAfter
     */
    if (hits && jsonData.length < chunkInfo.total) {
        const { hits: totalhits, total } = hits;
        jsonData = jsonData.concat(totalhits);
        const lastObject = totalhits[totalhits.length - 1];
        const nextSearchData =
            version > 5
                ? lastObject._id
                : `${lastObject._type}#${lastObject._id}`;
        return searchAfter(
            app,
            types,
            url,
            version,
            query,
            chunkInfo,
            totalhits.length === total ? '' : nextSearchData,
        );
    }

    str = JSON.stringify(jsonData, null, 4);
    jsonData = [];
    return str;
};

/**
 * Main function for getting data to be exported;
 * @param {*} app
 * @param {*} types
 * @param {*} url
 * @param {*} query
 * @param {*} searchAfter
 */
const exportData = async (
    app,
    types,
    url,
    version,
    query,
    chunkInfo,
    searchAfterData,
) => {
    try {
        const finalQuery = query || defaultQuery;
        const res = await searchAfter(
            app,
            types,
            url,
            version,
            finalQuery,
            chunkInfo,
            searchAfterData,
        );

        return res;
    } catch (e) {
        return e;
    }
};

export default exportData;