GitHub - abusomani/jsonhandlers: JSON library to expose simple handlers that lets you easily read and write json from various sources. (original) (raw)

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:

License

Licensed under MIT