diff --git a/Databases/ACID_principle.md b/Databases/ACID_principle.md deleted file mode 100644 index e51ea6d..0000000 --- a/Databases/ACID_principle.md +++ /dev/null @@ -1,35 +0,0 @@ ---- -categories: - - Databases -tags: [relational-databases] ---- - -# ACID principle - -> A database is a collection of organised data that can be efficiently stored, -> sorted, and searched. - -How the data is organised will often determine the _type_ of database used. -There are many different types of database; some examples of the different types -are relational, object-orientated, graphical, NoSQL, and distributed. All should -meet the principles of ACID. - -To ensure the integrity of a database, each change or transaction must conform -to a set of rules known as ACID: - -- **atomicity** - - when changing data within a database, if any part of the change fails, the - whole change will fail and the data will remain as it was before the change - was made; this is a safeguard that prevents partial records being created. -- **consistency** - - before data can be changed in a database, it must be validated against a set - of rules -- **isolation** - - databases allow multiple changes at the same time, but each change is - isolated from others -- **durability** - - once a change has been made, the data is safe, even in the event of system - failure - -> Databases will have mechanisms for **backup**, **distribution**, and -> **redundancy**, to ensure data is not lost. diff --git a/DevOps/AWS/SAM/Local_AWS_development_with_SAM.md b/DevOps/AWS/SAM/Local_AWS_development_with_SAM.md deleted file mode 100644 index 18121bc..0000000 --- a/DevOps/AWS/SAM/Local_AWS_development_with_SAM.md +++ /dev/null @@ -1,134 +0,0 @@ ---- -categories: - - DevOps - - Backend -tags: [AWS, docker] ---- - -# Local AWS development with SAM - -We can run a local instance of our SAM stack for a given application without -sending requests to the cloud. This is implemented through Docker. - -The SAM CLI handles all the Docker-related tasks, such as pulling the required -Lambda runtime images, creating containers, mounting your code and dependencies, -and running your Lambda functions inside those containers. - -## Basic set up - -Enter your project directory. - -First build your SAM application: - -```sh -sam build -``` - -We then run: - -```sh -sam local start-api -``` - -If you have an API Gateway endpoint that you want to call over the local server. -You will be able to call it after executing the above. - -This will be indicated by: - -![](/_img/local-sam-docker.png) - -If we want to invoke the function directly we use: - -```sh - sam local invoke [FunctionName] -``` - -## Using environment variables - -If you have an API key or database credentials, you are going to typically want -to use different values dependent on environment. - -Even if the values are the same accross environments, it's a good idea to not -call a secret when working locally since this request is billable. - -In the example below I show how to set up environment variables for an API key -locally and in production. - -## Create secret - -Go to AWS SecretsManager and add the API key as a secret. This will be sourced -in production. - -## Create local ENV file - -> These must be in JSON to work with SAM: - -### Local env - -```json -// local-env.json -{ - "FunctionName": { - "API_KEY": "xxx-yyy-xxx", - "NODE_ENV": "development" - } -} -``` - -We save these to the root of the given function's directory not at the global -repo level. - -> Be sure to add this to `.gitignore` so that it does not become public - -### Update `template.yaml` - -Every environment variable you intend to use, must exist in the `template.yaml`, -otherwise it will not be sourced at runtime: - -```yaml -... -Resources: - Properties: - Environment: - Variables: - SECRET_ARN: "arn:aws:secretsmanager:eu-west-2:885135949562:secret:wakatime-api-key-X9oF3v", - NODE_ENV: production - API_KEY: -... -``` - -> We go ahead and populate the values for production. But we leave the variable -> we use in development blank, since we don't want it committed and we will -> source it at the SAM invocation. It still needs to exist though. - -### Pass in the environment variable at invocation: - -```sh -sam local start-api --env-vars /home/thomas/repos/lambdas/wakatime-api/get-coding-stats/local-env.json -``` - -In production, the variables required will be automatically sourced from the -`template.yaml` - -### Create handler within the Lambda itself - -You are obviously going to need to distinguish between the different deployments -when the Lambda executes. Here is an example helper function: - -```ts -import * as AWS from "aws-sdk"; - -const secretsManager = new AWS.SecretsManager(); - -async function getApiKey(): Promise { - if (process.env.NODE_ENV === "production") { - const response = await secretsManager - .getSecretValue({ SecretId: process.env.SECRET_ARN as string }) - .promise(); - const secretValues = JSON.parse(response.SecretString as string); - return secretValues.API_KEY; - } else { - return process.env.API_KEY as string; - } -} -``` diff --git a/DevOps/AWS/SAM/SAM.md b/DevOps/AWS/SAM/SAM.md deleted file mode 100644 index 4a9c3fd..0000000 --- a/DevOps/AWS/SAM/SAM.md +++ /dev/null @@ -1,299 +0,0 @@ ---- -categories: - - DevOps - - Backend -tags: [AWS] ---- - -# AWS SAM - -SAM stands for **serverless application model**. It is a framework developed by -AWS to simplify the process of building, deploying and managing serverless -applications. It provides a concise syntax for defining the components of a -serverless application, such as -[Lambda functions](/DevOps/AWS/AWS_Lambda/Lambda_programming_model.md), -[API gateway](/DevOps/AWS/AWS_API_Gateway.md) and database tables. - -The SAM infrastructure is defined in a YAML file which is then deployed to AWS. -SAM syntax gets transformed into CloudFormation during the deployment process. -(CloudFormation is a broader and more robust AWS tool for large, highly -scaleable infrastructures). - -## Key features of SAM - -- Single deployment configuration -- Integration with development tools -- Local testing and debugging -- Built on AWS CloudFormation - -## Main technologies required - -### Docker - -Whilst SAM can be used to create a deployable file for AWS it can also be run as -a container for local development with Docker. - -### AWS CLI - -This is installed using Python and allows you to interact directly with AWS via -the command-line. - -### AWS SAM CLI - -See -[https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/install-sam-cli.html](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/install-sam-cli.html) - -## Setting up credentials for the AWS CLI - -You require an access key for the given -[IAM user](/DevOps/AWS/AWS_User_management_and_roles.md#iam). You should create -an IAM account specific to the project with bounded permissions. - -``` -aws configure -AWS Access Key ID [None]: AK******* -AWS Secret Access Key [None]: ukp****** -Default region name [None]: -Default output format [None]: -``` - -This information can be found in the Security Credentials section of the given -[IAM](/DevOps/AWS/AWS_User_management_and_roles.md#iam) user: - -![](/_img/access-key-aws.png) - -### Switching between credentials - -You should set up a different IAM user for each project. - -You can do this with: - -```sh -aws configure --profile -``` - -This will then ask you to add the credentials for the user. - -You can switch between different credentials for the user as follows: - -```sh -AWS_PROFILE= sam build - -``` - -## Starting a SAM project - -First create a directory for your project which will serve as the repository: - -```sh -mkdir aws-sam-learning -cd aws-sam-learning -``` - -Then we can use the `sam` cli to bootstrap the project: - -```sh -sam init --runtime nodejs16.x -``` - -We can just click through and accept the basic HelloWorld Lambda. - -This will create the Lambda as well as an API Gateway trigger URL. - -### `template.yaml` - -This is autogenerated and details the main constituents of the project. There -are lots of fields but the most important are the following: - -```yaml -HelloWorldFunction: - Type: AWS::Serverless::Function - Properties: - CodeUri: hello-world/ - Handler: app.lambdaHandler - Runtime: nodejs16.x - Architectures: - - x86_64 - Events: - HelloWorld: - Type: Api - Properties: - Path: /hello - Method: get -``` - -This details the location of the -[handler function](/DevOps/AWS/AWS_Lambda/Lambda_handler_function.md) which is -contained at the path `hello-world/app.js`: - -```js -exports.lambdaHandler = async (event, context) => { - try { - // const ret = await axios(url); - response = { - statusCode: 200, - body: JSON.stringify({ - message: "hello world", - // location: ret.data.trim() - }), - }; - } catch (err) { - console.log(err); - return err; - } - - return response; -}; -``` - -It also lists the `get` event that we can use to call API Gateway and trigger -the Lambda. - -The full template is below: - -![](/_img/sam-template-yaml.png) - -## Adding our own code - -We will create our own function and API Gateway trigger. - -We will place our function after the existing `HelloWorldFunction` - -```yaml -ClockFunction: - Type: AWS::Serverless::Function - Properties: - CodeUri: clock/ - Handler: handler.clock - Runtime: nodejs16.x - Events: - ClockApi: - Type: Api - Properties: - Path: /clock - Method: get -``` - -We can test the syntax with: - -```sh -sam validate -``` - -Just like with `HelloWorld`, we will create a directory for this function: -`clock` and we will initialise it as an `npm` project. - -```sh -mkdir clock -cd clock -npm init -``` - -We will use `handler.js` as our root, handler function. - -We have said in the template file that our `Handler: handler.clock`, therefore -the main function in the `handler` module should be `clock`: - -```js -const moment = require("moment"); - -exports.clock = async (event) => { - console.log("Clock function run"); - const message = moment().format(); - const response = { - statusCode: 200, - body: JSON.stringify(message), - }; - return response; -}; -``` - -The directory structure is as follows: - -![](/_img/sam-directory.png) - -When we call the API Gateway path `/clock` with `GET`, our function will be -triggered. - -## Deploying the project - -We will now deploy our project to AWS from the local environment. - -The process is as follows: - -1. Build -2. Package -3. Deploy - -### Build - -We need to install the runtime dependencies for the function. We do this by -running `sam build`. This ignores test files and development dependencies and -installs the project dependencies and source files to a temporary subdirectory. - -![](/_img/sam-build.png) - -The build directory is `.aws-sam/build/`. There will be a subdirectory for each -of our files. - -### Package - -As noted, CloudFront handles the deployment of the application. It can only -receive one file as an input. The packaging process consists in creating that -single file. - -The packaging proces will first archive all of the project artefacts into a zip -file and then upload that to [S3](/DevOps/AWS/AWS_S3.md). A reference to this S3 -entity is then provided to CloudFormation. - -![](/_img/s3-package-again.svg) - -The command is as follows: - -```sh -sam package - --template-file template.yaml - --output-template-file pkg.yml - --region eu-west-1 -``` - -This will automatically create a hashed bucket name for you in S3 (I have tried -to add my own naming but it doesn't comply.) - -### Local development with Docker - -In order to work with your application locally without actually sending requests -to AWS and using credit, you can run a local instance. - -See -[Local AWS Development with SAM](/DevOps/AWS/SAM/Local_AWS_development_with_SAM.md). - -### Deploy - -Once you have packaged the app you can deploy with `sam deploy --guided`. This -will talk you through the defaults and will deploy the package to -CloudFormation. In CloudFormation each individual project is called a **stack**. - -If we then go to Cloud Formation we will see the deployed application. - -![](/_img/cloud-formation-stack.png) - -## Call the endpoint - -If we now go to the Lambda console, we will see our function listed, and the API -Gateway endpoint under `triggers`: - -![](/_img/gateway-trigger.png) - -We can then call this from Postman to check everything is working as it should: - -![](/_img/postman-aws-output.png) - -## Clean up and erase the stack - -We can delete the stack and remove all the resources we have created with a -single CLI method: - -```sh -aws cloudformation delete-stack --stack-name --region -``` diff --git a/Networks/.gitkeep b/Networks/.gitkeep deleted file mode 100644 index e69de29..0000000 diff --git a/Programming_Languages/Frameworks/React/Classes/Forms.md b/Programming_Languages/Frameworks/React/Classes/Forms.md deleted file mode 100644 index 4e8c1c1..0000000 --- a/Programming_Languages/Frameworks/React/Classes/Forms.md +++ /dev/null @@ -1,156 +0,0 @@ ---- -categories: - - Programming Languages -tags: - - javascript - - react - - react-classes ---- - -# Managing forms with class components - -We are going to create a simple form that takes two integers from input fields -and returns their sum. Here is the raw component: - -```jsx -class Form extends React.Component { - render() { - return ( -
- - - - -
- ); - } -} -``` - -## Adding handlers - -```jsx -class Form extends React.Component { - handleSubmit = (event) => { - event.preventDefault(); - // Specific state change on submit - }; - render() { - return ( -
- - - - -
- ); - } -} -``` - -- The overall handling of the form is going to execute on the submission of the - form. So we create an `onSubmit` event within the form body and tie this to a - handling function (`handleSubmit`) on the class. - -- We follow the custom of generic naming of event methods with `handle[event]` , - just like we use `handleClick` with `onClick` events -- The `event` object is a React wrapper for the standard DOM event. We operate - on this object when managing the state of forms using React. -- `preventDefault` is just the React method of the traditional prevent default - method that we can apply to forms. It stops the page updating when the submit - button is clicked. - -## Capturing input values through state change - -In order to retrieve the values that the user enters we need to introduce state -to the form component. This is managed using the `onChange` event. Even though -the overall form action should be managed through `onSubmit` we need to -initialize state on the inputs we intend to use when the form is submitted. This -enshrines the React principle of **lifting state up**. As the `input` elements -are constituents of the overall `form` component, their state should be handled -by this common parent. - -### Initializing `input` state with `onChange` events - -To begin with let's just look at how we would do this in the abstract with a -single `input` before applying it to the two inputs in our example: - -```html - -``` - -We tie the state parameters in the `input` element to a `handleChange` function -on the parent component but we first need to add the starting state (using -`this.state` on the `Form` components' constructor: - -```jsx -class Form extends React.Component { - constuctor(props) { - super(props); - this.state = { - integerFirst: " " - }; -} -handleChange = (event) => { - this.setState( - { - integerFirst: event.target.value - } -} -``` - -Now the `Form` component is kept in the loop. Whenever the user alters the -`input` field, this change will be logged as a state change within React. This -will allow us to retrieve the values that the inputs have when the submit event -fires. - -## Handling multiple inputs - -It would be inefficient to have a change handler for every input in a form with -many inputs. In this scenario it is better to use destructuring to capture all -the values: - -```jsx -class Form extends React.Component { - constuctor(props) { - super(props); - this.state = { - integerFirst: "", - integerSecond: "" - }; -} - -returnSum = (x,y) => x + y; - -handleSubmit = (event) => { - event.preventDefault() - this.setState({ - outputSum: this.returnSum( - Number(this.state.integerFirst), Number(this.state.integerSecond) - ) -}); - -handleChange = (event) => { - this.setState( - { - [event.targe.name]: value - } -)} -render() { - return( -
- - - - -
- ) -}}; - -``` diff --git a/Programming_Languages/TypeScript/Functions.md b/Programming_Languages/TypeScript/Functions.md deleted file mode 100644 index 48eb033..0000000 --- a/Programming_Languages/TypeScript/Functions.md +++ /dev/null @@ -1,77 +0,0 @@ ---- -categories: - - Programming Languages -tags: - - typescript ---- - -# Functions - -## Basic typing within a function: arguments and return values - -With functions we can apply types to the return value, the parameters and any -values that are included within the function body. - -```ts -function search(query: string, tags: string[]): string {} -``` - -We can also specify optional parameters with use of the `?` symbol: - -```ts -function search(query: string, tags?: string[]): string {} -``` - -### Utilising custom types - -Whilst we can use standard JS types with the parameters and return value, the -real benefit comes when you use custom types. For instance we can specify that -an object passed to a function must match the shape of a custom type or -interface. Similarly we can ensure that for functions that return objects, the -object that is returned must satisfy the shape of the custom object. - -```ts -async function getContributorData( - contributorName: string -): Promise {} -``` - -For example, this function has a return signature which indicates that it will -return a promise matching a type of shape `IContributor` - -## Functions as types - -As well as typing the values that a function receives and returns, you can type -the function itself. **This is most useful when you are using higher-order -functions and passing functions as parameters to another function.** In these -scenarios you will want to type the function that is being passed as a -parameter. There are several ways to do this. We'll use the following basic -function as our demonstration: - -```ts -function higherOrderFunction(integer: number, addFunction: any): number { - return addFunction(integer); -} -``` - -### Use `typeof` - -```ts -// Declare an adding function -const addTwo = (int: number) => int + 2; - -// Apply it: -higherOrderFunction(3, addTwo); - -// We can now define the higher-order function with a specific type: - -function higherOrderFunction( - integer: number, - addFunction: typeof addTwo -): number { - return addFunction(integer); -} -``` - -This way we just use the native `typeof` keyword to assert that any call of -`hoFunc` should pass a function of the type `addTwo` diff --git a/_img/opensearch.drawio.svg b/_img/opensearch.drawio.svg deleted file mode 100644 index e75cc1d..0000000 --- a/_img/opensearch.drawio.svg +++ /dev/null @@ -1,4 +0,0 @@ - - - -
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domainText is not SVG - cannot display \ No newline at end of file diff --git a/_scripts/flatten_directories.sh b/_scripts/flatten_directories.sh new file mode 100755 index 0000000..9dcb165 --- /dev/null +++ b/_scripts/flatten_directories.sh @@ -0,0 +1,15 @@ +#!/bin/bash +directories_to_parse="../Computer_Architecture ../Databases ../Electronics_and_Hardware ../Operating_Systems ../Programming_Languages ../DevOps" + +directory="/home/thomas/repos/eolas-bak" + +mapfile -t directories < <(find "$directory" -type d) +file_matches=() + +# Return array of all files belonging to source dirs... +for ele in ${directories[@]}; do + file_matches+=( $(find $ele -name "*.md" -type f) ) +done + +echo ${file_matches[1]} + diff --git a/_scripts/rename_img_links.sh b/_scripts/rename_img_links.sh index 9a49ec4..834dcb1 100755 --- a/_scripts/rename_img_links.sh +++ b/_scripts/rename_img_links.sh @@ -6,3 +6,6 @@ find /home/thomas/repos/eolas/ -type f -name "*.md" | while read file; do sed -i 's/\/img\//\/_img\//g' $file done + + + diff --git a/Programming_Languages/NodeJS/REST_APIs/0_Introduction.md b/zk/0_Introduction.md similarity index 100% rename from Programming_Languages/NodeJS/REST_APIs/0_Introduction.md rename to zk/0_Introduction.md diff --git a/Programming_Languages/NodeJS/REST_APIs/1_GET.md b/zk/1_GET.md similarity index 100% rename from Programming_Languages/NodeJS/REST_APIs/1_GET.md rename to zk/1_GET.md diff --git a/Programming_Languages/NodeJS/REST_APIs/2_POST.md b/zk/2_POST.md similarity index 100% rename from Programming_Languages/NodeJS/REST_APIs/2_POST.md rename to zk/2_POST.md diff --git a/Programming_Languages/NodeJS/REST_APIs/3_PUT.md b/zk/3_PUT.md similarity index 100% rename from Programming_Languages/NodeJS/REST_APIs/3_PUT.md rename to zk/3_PUT.md diff --git a/Programming_Languages/NodeJS/REST_APIs/5__Integrating_the_database.md b/zk/5__Integrating_the_database.md similarity index 100% rename from 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