JsonHandlers

 

JSON library to expose simple handlers that lets you easily read and write json from various sources.

Prerequisites

A go module where you want to integrate jsonhandlers. To create one, follow this guide.

Installation

go get github.com/abusomani/jsonhandlers

Usage

A very useful feature of Go’s import statement are aliases. A common use case for import aliases is to provide a shorter alternative to a library’s package name.

In this example, we save ourselves having to type jsonhandlers everytime we want to call one of the library’s functions, we just use jh instead.

import (
    jh "github.com/abusomani/jsonhandlers"
)

Options

Jsonhandlers package exposes multiple options while creating a new jsonhandler to be able to read/write json from sources like Files, Http Requests or Http responses.

WithFileHandler

You can use the WithFileHandler option to read/write Json from/to a file. For this, you need to create a new jsonhandler with the file handler option.

Example to understand WithFileHandler in more detail.

Sample Code

package operations

import (
	"fmt"

	"github.com/abusomani/jsonhandlers"
)


func handleFile() {
	jh := jsonhandlers.New(jsonhandlers.WithFileHandler(testFilePath))

	var sch school
	err := jh.Unmarshal(&sch)
}

WithHTTPRequestHandler

You can use the WithHTTPRequestHandler option to read Json from a Http Request and to write Json to a Http ResponseWriter. For this, you need to create a new jsonhandler with the Http request handler option.

Example to understand WithHTTPRequestHandler in more detail.

Sample Code

package operations

import (
	"net/http"

	"github.com/abusomani/jsonhandlers"
)

type studentSearchRequest struct {
	Name string
}

type studentSearchResponse struct {
	Info student
}

func HandleHTTPRequest(students []student) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		
    	jh := jsonhandlers.New(jsonhandlers.WithHTTPRequestHandler(w, r))

		var reqBody studentSearchRequest
		_ := jh.Unmarshal(&reqBody)
		

		for _, student := range students {
			// student found
			if student.Name == reqBody.Name {
				
				// write the response using jh.Marshal
				jh.Marshal(studentSearchResponse{
					Info: student,
				})
				return
			}
		}
	})
}

/*
  Sample request to be hit on the localhost server to test WithHTTPRequestHandler functionality.
  curl http://localhost:8080/search -d '{"Name": "Abhishek Somani"}'
*/

WithHTTPResponseHandler

You can use the WithHTTPResponseHandler option to read/write Json from/to a Http Response. For this, you need to create a new jsonhandler with the Http response handler option.

Example to understand WithHTTPResponseHandler in more detail.

Sample Code

package operations

import (
	"fmt"
	"log"
	"net/http"

	"github.com/abusomani/jsonhandlers"
)

type user struct {
	Id        int
	FirstName string
	LastName  string
}

type getUsersResponse struct {
	Users []user
}

func HandleHTTPResponse() {
	resp, _ := http.Get("https://dummyjson.com/users")
	jh := jsonhandlers.New(jsonhandlers.WithHTTPResponseHandler(resp))

	var userResp getUsersResponse
	jh.Unmarshal(&userResp)
}

Run examples

To run the examples present in the example folder you need to first checkout this package by doing a git clone. Once you have checked out this package, then you can run the main.go using the following command to see all the examples in action:

go run example/main.go

License

Licensed under MIT