This series of stories introduces most common DevOps practices in the industry. Each story focus on a specific point. User Acceptance Tests (UAT) ensure that the application as a whole meets the expected functionalities and that no regression has been introduced in the other functionalities. In other words, they ensure…

The origin host is the domain name of the origin server to which Alibaba Cloud CDN initiates back-to-source requests. In this section, we will study: configuration of an origin host, configuration of the associated protocol policy, configuration of a back-to-origin authorization for private buckets and disabling it, SNI configuration, which…

Hardhat’s hardhat-gas-reporter plugin (https://www.npmjs.com/package/hardhat-gas-reporter) provides gas information during test suite execution: Gas consumption per unit test, Metrics for deployments and method calls, Deployment and usage costs in local currency. To use this plugin, we will: Create a Hardhat project, Create a smart contract, Install and configure the plugin, Run the…

grep grep <OPTIONS> <PATTERN> <FILENAME> displays the lines of a file corresponding to a specified pattern. The arguments are: -c (or --count): displays a count of matching lines for each input file, -C <NUMBER> (or --context): displays context lines between continuous groups of matches, -E <PATTERN> (or --extended-regexp): uses the pattern…

Function modifiers allow you to change the behavior of a function, such as adding a prerequisite to a function. The body of the function is inserted at the location of the _; symbol. If the condition of the modifier is satisfied when the function is called, it is executed. …

Solidity provides two particular types of getter functions: view and pure. The view functions view allows the state to be read but does not allow the state to be modified: uint public a = 1; function viewFunction(uint b) public view returns (uint) { return a + b; } Let’s compile and deploy the…