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@StarpTech
StarpTech / react-hooks-axios.js
Created Jun 3, 2019
React Hooks Axios Client
View react-hooks-axios.js
// Inspired by https://www.robinwieruch.de/react-hooks-fetch-data/
const dataFetchReducer = (state, action) => {
switch (action.type) {
case 'REQUEST_INIT':
return { ...state, isLoading: true, isError: false };
case 'REQUEST_SUCCESS':
return { ...state, isLoading: false, isError: false, data: action.payload };
case 'REQUEST_FAILURE':
return { ...state, isLoading: false, isError: true };
@StarpTech
StarpTech / redis-cache-service.js
Last active May 21, 2019
Simple Redis Cache Client for Node.js
View redis-cache-service.js
'use strict';
const assert = require('assert');
/**
* The redis client is https://github.com/luin/ioredis
*/
/*
const redisClient = new Redis({
@StarpTech
StarpTech / event-loop-examples.js
Created May 23, 2017
Great examples to understand the differences of setImmediate, setTimeout and nextTick()
View event-loop-examples.js
/**
* setImmediate callbacks are fired off the event loop, once per iteration in the order that they were queued.
* So on the first iteration of the event loop, callback A is fired.
* Then on the second iteration of the event loop, callback B is fired, then on the third iteration of the event loop callback C is fired, etc.
* This prevents the event loop from being blocked and allows other I/O or timer callbacks to be called in the mean time (as is the case of the 0ms timeout, which is fired on the 1st or 2nd loop iteration).
*/
setImmediate(function A() {
setImmediate(function B() {
console.log(1);
@StarpTech
StarpTech / graphql-caching.md
Last active Nov 4, 2018
Notes about Caching in GraphQL
View graphql-caching.md

Graphql cache challenges

How to practice HTTP Caching?

GraphQL queries are usually POST requests. POST request aren't cached by nature. This means that we need different solutions to deliver our content efficiently.

@StarpTech
StarpTech / fab.ts
Last active Oct 29, 2018
Small library to validate numeric data structures in a functional-style
View fab.ts
/**
* Small library to validate numeric data structures in a functional-style
* All functions are right associative
* If you are looking for more sophisticated features have a look at
* https://ramdajs.com/
*/
export interface FabPattern {
[index: string]: (input: number) => boolean;
}
@StarpTech
StarpTech / arangodb.js
Last active Apr 11, 2018
Manage Multi-Tenancy in Arangojs
View arangodb.js
// initialize
// The maximum number of requests is equal to
// maxSockets * 2 with keepAlive: true or equal to maxSockets with keepAlive: false.
const arangodb = new Arangojs.Database({
url: "http://localhost:8529", // Base URL of the ArangoDB server or list of server URLs.
agentOptions: {
maxSockets: 100,
keepAlive: true
},
loadBalancingStrategy: 'ROUND_ROBIN'
View index.js
"use strict";
const _ = require("lodash");
function groupByTimeWindow(start, end) {
return function(o) {
const date = new Date(o.timestamp);
if (date.getUTCHours() >= start && date.getUTCHours() <= end)
return o.consumption_Wh;
return 0;
@StarpTech
StarpTech / range-channels-backpressure.go
Created Jan 28, 2018
When a channel is closed sent messages are proceed until the "range" is closed
View range-channels-backpressure.go
package main
import (
"fmt"
"sync"
"time"
)
func main() {
var wg sync.WaitGroup
@StarpTech
StarpTech / range-channels.go
Created Jan 28, 2018
When a channel is closed all buffered and blocked messages are proceed until the "range is finish
View range-channels.go
package main
import (
"fmt"
"sync"
"time"
)
func main() {
var wg sync.WaitGroup
@StarpTech
StarpTech / hemera-hapi.js
Last active Apr 22, 2017
Hemera with Hapi
View hemera-hapi.js
'use strict'
const Hapi = require('hapi')
const server = new Hapi.Server()
server.connection({ port: 80 })
server.register({
register: require('hapi-hemera'),
options: {
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