@cyclic.sh/dynamodb/dist/cy_db_index.js

SDK for interacting with Cyclic.sh (https://cyclic.sh) app AWS DynamoDB databases

const { QueryCommand } = require("@aws-sdk/lib-dynamodb");
const { docClient } = require("./ddb_client");
const CyclicItem = require("./cy_db_item");
const { validate_strings } = require("./cy_db_utils");
class CyclicIndex {
  constructor(name, collection = null, props = {}) {
    validate_strings(name, "Index Name");
    this.name = name;
    this.collection = collection;
  }

  async find(key) {
    let limit = 10000;
    let next = undefined;
    let results = [];
    do {
      let params = {
        TableName: process.env.CYCLIC_DB,
        IndexName: "gsi_s",
        KeyConditionExpression: "gsi_s = :gsi_s",
        ExpressionAttributeValues: {
          ":gsi_s": `${this.name}#${key}`,
        },
        ExclusiveStartKey: next,
        ScanIndexForward: false,
      };

      if (this.collection) {
        (params.KeyConditionExpression = `${params.KeyConditionExpression} and begins_with(gsi_s_sk,:sk)`),
        (params.ExpressionAttributeValues[":sk"] = `${this.collection}#`);
      }

      let res = await docClient.send(new QueryCommand(params));
      next = res.LastEvaluatedKey;
      results = results.concat(res.Items);
    } while (next && results.length < limit);

    results = results.map((r) => {
      return CyclicItem.from_dynamo(r);
    });
    let result = {
        results
      }
      if(next){
        result.next = next
      }
      return result;
  }
}

module.exports = CyclicIndex;