Custom bitcoin price

Summary

This package consumes a coindesk API to get the bicoin price then add or remove a markup base on if you are buying or selling in other to get the final price with all action being perfomed all from a graphiql interface.

Technology used

1. Nodejs
2. Mocha
3. Typescript
4. TsLint
5. Graphql

Setup & Installation

• Clone the repository into a directory of your choice
• Open your Terminal and run git clone https://github.com/princesegzy01/custom-bitcoin-price.git
• change directory to the app you cloned buy running cd custom-bitcoin-price
• Install dependencies by running npm install on your terminal.

Start Server

• From your terminal, run npm run ts-watch to watch changes to typescripts file and automatically transpile it.

• open another terminal and run node index.js to start the server. you should see an output like this Running a GraphQL API server at localhost:3000/graphiql.

Open Application

• Open your browser and logon to http://localhost:3000/graphiql. you should see a page like below.

Expample with Details

This app contain a single graphQL query method named calculatePrice. This method accept three required arguments:

• type: (String) This can either be buy or sell buying means you are buying from the platform and selling means you are selling to the platform.

• margin (Float): This is a percentage that is used in a calculating the markup or markdown to get the final price. margin must be between 0.1 to 1.0

• exchangeRate (Number) : This is a custom USD/NGN exchange that is used to connvert the dollar price to Naira equivalent.

On the graphiql interface, type the following code

{  
    calculatePrice(type:"buy", margin : 0.2, exchangeRate :300) 
}

you will receive a response containing the peice based on the parameter you supplied. sample response :

{
    "data": {
        "calculatePrice": "3429289.80"
    }
}

Test

The test for this application are written using the following tech nologies : Mocha, Chai and Supertest.

To run the test, open your Terminal, cd into the project root and run npm test.

Feel free to reach out to me if you have any questions at [email protected]