gjohnson

In JavaScript, when using a fetch() call that results in an exception (e.g., a network error), only the catch() block is executed, not the then() block. Here's how it works in detail:

1. If the fetch() request succeeds in making the HTTP request (even if the response is an error, such as a 404 or 500 status code), it does not reject the promise. The then() block is called, and you need to check the response.ok property or response.status to determine if the response was successful.

2. If the fetch() call fails completely due to a network error, DNS failure, or other reasons that prevent it from connecting to the server, the promise is rejected, and the catch() block is executed.

fetch('https://example.com/api/data')
 .then(response => {

gjohnson

const mongoose = require('mongoose');

mongoose.connect('mongodb://admin:admin@mongodb:27017/').catch(err => {
    console.error('Error connecting to MongoDB:', err);
}).then(() => {
    console.log('Connected to MongoDB');
});

gjohnson

import * as cdk from 'aws-cdk-lib';
import * as glue from 'aws-cdk-lib/aws-glue';
import * as iam from 'aws-cdk-lib/aws-iam';
import * as s3 from 'aws-cdk-lib/aws-s3';
import { Construct } from 'constructs';

class GlueWorkflowStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

gjohnson

import * as cdk from 'aws-cdk-lib';
import * as glue from 'aws-cdk-lib/aws-glue';
import * as redshift from 'aws-cdk-lib/aws-redshift';
import * as s3 from 'aws-cdk-lib/aws-s3';
import * as iam from 'aws-cdk-lib/aws-iam';
import * as core from 'aws-cdk-lib/core';

export class YourCdkStack extends core.Stack {
  constructor(scope: core.Construct, id: string, props?: core.StackProps) {
    super(scope, id, props);

gjohnson

#!/bin/bash

# Specify the desired volume size in GiB as a command line argument. If not specified, default to 20 GiB.
SIZE=${1:-40}

# Get the ID of the environment host Amazon EC2 instance.
INSTANCEID=$(curl http://169.254.169.254/latest/meta-data/instance-id)
REGION=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone | sed 's/\(.*\)[a-z]/\1/')

# Get the ID of the Amazon EBS volume associated with the instance.

gjohnson

Producer

Simple producer, nothing wrong here...

var amqp = require('amqp');

var connection = amqp.createConnection({
  port: 5672, host: 'localhost'
});

gjohnson

var mongoose = require('mongoose')
  , revision = require('..')
  , Schema = mongoose.Schema;

mongoose.connect('localhost', 'sandbox');

var schema = new Schema({
  title: String,
  content: String
});

gjohnson

package main

import (
	_ "context"
	"flag"
	"fmt"
	"github.com/go-kit/kit/log"
	"net/http"
	"net/http/pprof"
	"os"

gjohnson

docker run --rm -it -v "${GOPATH}":/gopath -v "$(CURDIR)":/app -e "GOPATH=/gopath" -w /app golang:1.7 sh -c 'CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-s" -o app'

gjohnson

Keybase proof

I hereby claim:

• I am gjohnson on github.
• I am gjj (https://keybase.io/gjj) on keybase.
• I have a public key whose fingerprint is 407C A136 5E34 F542 4EF5 2A92 89A7 7D5B 4490 D956

To claim this, I am signing this object: