xsheetjs/demos/database/SheetJSRedis.js

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* eslint-env node */
var XLSX = require("xlsx");
const pair = (arr) => arr.map((x,i)=>!(i%2)&&[x,+arr[i+1]]).filter(x=>x);
const keyify = (obj) => Object.keys(obj).map(x => [x, obj[x]]);
async function redis_to_wb(R) {
var wb = XLSX.utils.book_new();
var manifest = [], strs = [];
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/* store strings in strs and keep note of other objects in manifest */
var keys = await R("keys")("*"), type = "";
for(var i = 0; i < keys.length; ++i) {
type = await R("type")(keys[i]);
switch(type) {
case "string": strs.push({key:keys[i], value: await R("get")(keys[i])}); break;
case "list": case "zset": case "set": case "hash": manifest.push({key:keys[i], type:type}); break;
default: throw new Error("bad type " + type);
}
}
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/* add worksheets if relevant */
if(strs.length > 0) {
var wss = XLSX.utils.json_to_sheet(strs, {header: ["key", "value"], skipHeader:1});
XLSX.utils.book_append_sheet(wb, wss, "_strs");
}
if(manifest.length > 0) {
var wsm = XLSX.utils.json_to_sheet(manifest, {header: ["key", "type"]});
XLSX.utils.book_append_sheet(wb, wsm, "_manifest");
}
for(i = 0; i < manifest.length; ++i) {
var sn = "obj" + i;
var aoa, key = manifest[i].key;
switch((type=manifest[i].type)) {
case "list":
aoa = (await R("lrange")(key, 0, -1)).map(x => [x]); break;
case "set":
aoa = (await R("smembers")(key)).map(x => [x]); break;
case "zset":
aoa = pair(await R("zrange")(key, 0, -1, "withscores")); break;
case "hash":
aoa = keyify(await R("hgetall")(key)); break;
default: throw new Error("bad type " + type);
}
XLSX.utils.book_append_sheet(wb, XLSX.utils.aoa_to_sheet(aoa), sn);
}
return wb;
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}
/* convert worksheet aoa to specific redis type */
const aoa_to_redis = {
list: async (aoa, R, key) => await R("RPUSH")([key].concat(aoa.map(x=>x[0]))),
zset: async (aoa, R, key) => await R("ZADD" )([key].concat(aoa.reduce((acc,x)=>acc.concat([+x[1], x[0]]), []))),
hash: async (aoa, R, key) => await R("HMSET")([key].concat(aoa.reduce((acc,x)=>acc.concat(x), []))),
set: async (aoa, R, key) => await R("SADD" )([key].concat(aoa.map(x=>x[0])))
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};
async function wb_to_redis(wb, R) {
if(wb.Sheets._strs) {
var strs = XLSX.utils.sheet_to_json(wb.Sheets._strs, {header:1});
for(var i = 0; i < strs.length; ++i) await R("SET")(strs[i]);
}
if(!wb.Sheets._manifest) return;
var M = XLSX.utils.sheet_to_json(wb.Sheets._manifest);
for(i = 0; i < M.length; ++i) {
var aoa = XLSX.utils.sheet_to_json(wb.Sheets["obj" + i], {header:1});
await aoa_to_redis[M[i].type](aoa, R, M[i].key);
}
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}
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module.exports = {
redis_to_wb,
wb_to_redis
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};