Tech Tips – Jitendra Zaa's Blog

Frequently Used Git Commands

Set Git to store credentials

Below command can be executed from anywhere in your system.

git config --global credential.helper wincred

Turn off Warning _LF will be replaced by CRLF_

git config core.autocrlf true
or
git config --global core.autocrlf true

In Unix systems the end of a line is represented with a line feed (LF). In windows a line is represented with a carriage return (CR) and a line feed (LF) thus (CRLF). when you get code from git that was uploaded from a unix system they will only have an LF.

What is Micro Services

I have read many posts and watched video to understand Microservices precisely however I found Martin Fowler’s explanation about Microservices most helpful. This blog post is just the recap & summary of what I understood about Microservices Architecture.

Characteristics of Microservices

Build services in form of Components
- Components can be independently replaceable and upgradable
- Components can be combination of Libraries and Services
- Services can be built in other languages and services can inter communicate
Organized keeping business rules in mind
- Traditionally (Monolithic), Services were organized considering technical aspects like different services related to UI, Database, Server etc
- Microservices, suggests to group it as per business capabilities like shipping, Order, Catalog etc
Smart end points and dump pipe
- In ESB (aka spaghetti box 😉 lol), we tend to add all smartness in ESB itself and endpoint is just a dump where consumer gets preprocessed data
- MicroServices on other hand encourages dump pipe (ESB) and smart endpoints
Decentralized Governance or Data Governance
- Every Service should be responsible for their own database & persistence
- Can’t communicate to other databases directly, it should be via API’s only (These are mostly inspired by Amazon’s 2 Pizza team size)
- Every service can have different languages or tools
Infrastructure Automation
- Continuous Delivery is very important for each services to make sure there is no or minimal down time
- Top class monitoring capabilities to perform analysis of degraded performance or downtime
- Important to have roll back plan and ability to spin up new server in case of service or service fail
Design for failure
- As there could be many microservices, its inevitable that they would fail.
- Companies like Netflix, they have a application (chaos monkey) which randomly goes out and fail their microservices deliberately
- Its important to perform these kind of exercises to understand how resilient their network and microservices are.

How to setup Git Server using Bitvise SSH

Recently for one of client, I was in need to setup Git on their intranet. Being healthcare industry and compliance issue, source code could not leave company network and therefore needed in-house solution for Source Code Management (SCM) and automate builds.

In this blog post, I will explain how did we setup Git server that is accessible from anywhere in company network.

We need below two software installed on system which will act as a Git Server.

Git (Free)
Bitvise SSH Server (Paid )

First we need to install Git on server and add path of “git.exe” in environment variable, so that we can use git command from console.

Next, we need to install Bitvise SSH Server and set it up. Once, Bitvise SSH Server is installed, we need to follow below steps.

Step 1: Open Bitvise SSH Server control panel as shown in below image

How to use Symbolic Link to move Google Chrome AppData folder to other location

Few months back I bought a new high end laptop with i7 processor and 16GB of RAM. Decided to give a shot to “SSD hard disc” over conventional hard disc. Performance of my system is incredibly fast, I have SQL Server, Jenkins, Command line Dataloader jobs, Apex static code analyzer all running almost at same time. Windows OS boots up in almost 2-3 seconds only, as compared to 15-25 sec previously. However because of decision of “SSD Drive” I had to compromise storage capacity. My “C” drive is only around 150 GB however D drive has lot of space. After analyzing many folders, I found that google chrome browser creates its temporary folder in “C” drive even though I have installed it explicitly in “D” drive. I wanted to move “Appdata” folder of google chrome to “D” drive to make sure I have enough space in “c” drive.

I came across “Symbolic link” concept in operating System. In “Symbolic link” folder points to other location and its very useful technique to solve problem of storage. We can create symbolic link of many folder from “c” drive to any other location where we have good enough space.

Fix Git errors : Permission denied , Cannot spawn , No supported authentication methods available

Recently, I came across few errors of Git and found very time consuming to fix those. Let’s discuss what are those errors and how we can fix it.

Error : Permission denied (publickey). fatal : could not read from remote repository

This error came while trying to push changes to remote repository using ssh keys. This error means we need to provide information about SSH key. it can be done by setting environment variable GIT_SSH.

Using Selenium to test workflow field update action – Salesforce automated testing – Video tutorial – Part 2

We have already discussed basics of selenium and how we can use this tool for automated testing. Here we will see how we can take advantage of Selenium to test workflow field update. in this article we will create a simple workflow rule on Lead object and update “Description” field by adding fields “Number of Employees” and “Number of Locations”. We can use selenium to test if workflow is working or not ?

Salesforce Workflow rule - field update on Lead — Salesforce Workflow rule – field update on Lead

Getting started with Git and Bitbucket in 5 minutes with TortoiseGit | Video Tutorial

This is very short video tutorial which explains how easily we can use Git to manage source code on bitbucket using Tortoisegit in almost 5 minutes.

Using CCTray to monitor continuous integration setup using Jenkins for Salesforce | Video Tutorial

In previous article, I have explained that how to use Jenkins to setup Continuous integration for Salesforce.

Now, once Jenkins is up and its doing its job to build Salesforce changes. Next task is to monitor build result. We already setup post deployment task by creating chatter message to notify everyone about build result, however there is one more excellent way to be aware about result and its small desktop client named “CCTray”.

You can download CCTray from here. Once installed, follow below steps to setup.

Open CCTray and navigate to settings :

Resolve Error : Eclipse SSH key is not matching the SSH key(s) that is associated with your Heroku account

We have seen that how to create First Heroku application using Eclipse. However it is possible that after following all steps properly in above article you may receive error saying

the Eclipse SSH key is not matching the SSH key(s) that is associated with your Heroku account. To fix this error, you can: – Associate your SSH key to your Heroku account by going to “Preferences” OR – If the SSH Key is correct, restart Eclipse

Eclipse and Heroku SSH key is not matching

However, if you will login to heroku, you will find that application is already created. Error is only at Eclipse end.

IndexedDB – Client Side Database

One of many features of HTML5 is capability to store data on client machine with the help of “Indexed Database API“. Using this technique web developers can add offline capabilities to their application. Currently almost every modern browser supports “IndexedDB”.

Unlike traditional RDBMS, IndexedDB doesn’t have table or columns which supports SQL. In RDBMS, it is very hard to change structure of table once schema is decided. IndexedDB actually stores object which can be of any type. Store Object in IndexedDB and process inside Javascript, it is that simple. Every object needs to have unique Index which makes it accessing faster and efficient. Before IndexedDB, we had “Web SQL Database“. However W3C announced that it is depreciated, still few browsers continues support for Web SQL.

Lets start with Example on Indexed DB :

Very first step in IndexedDB is opening database. Below Code Sample will explain the process.