Richard Dunn daverickdunn
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| import { | |
| CloudWatchLogsClient, | |
| StartQueryCommand, | |
| GetQueryResultsCommand, | |
| LogGroup, | |
| DescribeLogGroupsCommand, | |
| ResultField | |
| } from '@aws-sdk/client-cloudwatch-logs'; | |
| import { writeFileSync } from 'fs'; | |
| import { DateTime } from 'luxon'; |
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| export function encode(unencoded: string) { | |
| return Buffer.from(unencoded).toString('base64'); | |
| }; | |
| export function decode(encoded: string) { | |
| return Buffer.from(encoded, 'base64').toString('utf8'); | |
| }; | |
| export function urlEncode(unencoded: string) { | |
| let encoded = encode(unencoded); |
daverickdunn
/ ddb.replace-sets.ts
Last active
November 11, 2020 10:38
Replace ECMA Sets with DocumentClient Sets
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| import { DocumentClient } from 'aws-sdk/clients/dynamodb'; | |
| function ReplaceSets(item: any) { | |
| const keys = Object.keys(item); | |
| for (let index = 0; index < keys.length; index++) { | |
| const element = item[keys[index]]; | |
| if (typeof element === 'object' && element instanceof Set) { | |
| if (element.size === 0){ | |
| item[keys[index]] = null; | |
| } else { |
daverickdunn
/ put-batch.js
Last active
April 21, 2020 23:52
DynamoDB - Dynamically Map-Reduce a Batch Update Request in to Blocks of 25 Items
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| // Your DocClient ... | |
| function SplitBatch(params) { | |
| const max_items = 25; | |
| let tables = Object.entries(params.RequestItems); | |
| let transactions = {}; | |
| for (const [table, requests] of tables) { | |
| for (let index = 0; index < requests.length; index += max_items) { | |
| let block = requests.slice(index, index + max_items); |
daverickdunn
/ update-example.js
Last active
March 27, 2023 11:45
DynamoDB - Dynamically Build an Update Expression
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| const generateUpdateQuery = (fields) => { | |
| let exp = { | |
| UpdateExpression: 'set', | |
| ExpressionAttributeNames: {}, | |
| ExpressionAttributeValues: {} | |
| } | |
| Object.entries(fields).forEach(([key, item]) => { | |
| exp.UpdateExpression += ` #${key} = :${key},`; | |
| exp.ExpressionAttributeNames[`#${key}`] = key; | |
| exp.ExpressionAttributeValues[`:${key}`] = item |
daverickdunn
/ output.txt
Last active
September 8, 2020 01:56
Convert a simplified directory structure (tree) to a set of clustered documents. Parameterised to control cluster sizes.
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| { id: 'A', | |
| chn: | |
| [ { id: 'B', chn: [ { id: 'D', chn: [] } ] }, | |
| { id: 'C', | |
| chn: | |
| [ { id: 'E', chn: [] }, | |
| { id: 'F', chn: [] }, | |
| { id: 'G', | |
| chn: | |
| [ { id: 'H', chn: [ { id: 'I', chn: [] }, { id: 'J', chn: [] } ] } ] } ] } ] } |
daverickdunn
/ create_and_trust.js
Last active
June 27, 2022 20:19
Stellar JS SDK create account and set trust-line
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| const StellarSdk = require('stellar-sdk'); | |
| StellarSdk.Network.useTestNetwork(); // StellarSdk.Network.usePublicNetwork(); | |
| const server = new StellarSdk.Server('https://horizon-testnet.stellar.org'); // const server = new StellarSdk.Server('https://horizon.stellar.org'); | |
| // an arbitary list of trusted assets | |
| const ASSETS = { | |
| 'XPORT': new StellarSdk.Asset('XPORT', 'GCC4HAL7SOR7AZBF53SUTVAJT4OHYLBHOUJMM3IAF5YLFF7OVVAWLVFT'), | |
| 'USDT': new StellarSdk.Asset('USDT', 'GCQTGZQQ5G4PTM2GL7CDIFKUBIPEC52BROAQIAPW53XBRJVN6ZJVTG6V'), | |
| 'MOBI' : new StellarSdk.Asset('MOBI', 'GA6HCMBLTZS5VYYBCATRBRZ3BZJMAFUDKYYF6AH6MVCMGWMRDNSWJPIH'), |
daverickdunn
/ stream_listener.js
Last active
August 22, 2021 22:34
Stellar JS SDK listen to server streamed EventSource events
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| const StellarSdk = require('stellar-sdk'); | |
| StellarSdk.Network.useTestNetwork(); // StellarSdk.Network.usePublicNetwork(); | |
| const server = new StellarSdk.Server('https://horizon-testnet.stellar.org'); // const server = new StellarSdk.Server('https://horizon.stellar.org'); | |
| // convenience method: returns a PaymentCallBuilder | |
| // https://stellar.github.io/js-stellar-sdk/PaymentCallBuilder_PaymentCallBuilder.html#stream | |
| // there are similar CallBuilders for other network events, this one is specific to payments | |
| var stream = server | |
| .payments() |
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| const StellarSdk = require('stellar-sdk'); | |
| StellarSdk.Network.useTestNetwork(); // StellarSdk.Network.usePublicNetwork(); | |
| const server = new StellarSdk.Server('https://horizon-testnet.stellar.org'); // const server = new StellarSdk.Server('https://horizon.stellar.org'); | |
| // an arbitary list of trusted assets | |
| const ASSETS = { | |
| 'XPORT': new StellarSdk.Asset('XPORT', 'GCC4HAL7SOR7AZBF53SUTVAJT4OHYLBHOUJMM3IAF5YLFF7OVVAWLVFT'), | |
| 'USDT': new StellarSdk.Asset('USDT', 'GCQTGZQQ5G4PTM2GL7CDIFKUBIPEC52BROAQIAPW53XBRJVN6ZJVTG6V'), | |
| 'MOBI' : new StellarSdk.Asset('MOBI', 'GA6HCMBLTZS5VYYBCATRBRZ3BZJMAFUDKYYF6AH6MVCMGWMRDNSWJPIH'), |
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| const StellarSdk = require('stellar-sdk'); | |
| StellarSdk.Network.useTestNetwork(); // StellarSdk.Network.usePublicNetwork(); | |
| const server = new StellarSdk.Server('https://horizon-testnet.stellar.org'); // const server = new StellarSdk.Server('https://horizon.stellar.org'); | |
| // Note: this solution trusts the accounts asset codes alone. | |
| // For general accounts you may need to verify the issuing account id: b.asset_issuer | |
| const getBalance = (account, currency) => { | |
| let balance = 0; | |
| if (currency == 'XLM') { | |
| balance = Number.parseFloat(account.balances.find(b => b.asset_type == 'native').balance); |
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