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https://github.com/tompston/gomarvin

Generate Go REST servers & http clients
https://github.com/tompston/gomarvin

api boilerpate codegen echo gin gin-gonic go gofiber golang rest rest-api typescript

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Generate Go REST servers & http clients

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Generate boilerplate for Gin / Fiber / Echo / Chi REST servers.



 AKA Why spend 5 minutes doing it when I can spend 3 months automating it? 







https://user-images.githubusercontent.com/82293948/197339991-ca049896-7a0e-4fa9-ae2b-787f0bb021b2.mp4



Generate:



- Init server + controllers for endpoints

- Typescript fetch functions with type-checked payloads for generated endpoints

- SQL files with tables and queries for controllers ( Postgres )



from one config file.



### Disclaimer!



I'm still figuring out how to do stuff better, so if there's a new release where the `y` in `x.y.z` the version ( tag ) is incremented, that means that there are breaking changes. The current versions work, but there's a lot of improvements that can be done to make stuff better.



## [Documentation](https://gomarvin.pages.dev/docs)



## Install



1.  Either create a custom config file [with the frontend editor](https://gomarvin.pages.dev/) or copy one of the config file from [examples dir](https://github.com/tompston/gomarvin/tree/main/examples)



2.  Install gomarvin



```bash

# install the binary

go install github.com/tompston/gomarvin@latest

# or clone the repo and run go run main.go

git clone https://github.com/tompston/gomarvin.git

```



3. run gomarvin



```bash

# run this in the same dir as the config file, if the name of the config is "gomarvin.json"

gomarvin generate



# run this if custom config file name or path

gomarvin -config="PATH_TO_CONFIG" generate



# optionally generate the golang struct -> typescript interface converters

gomarvin -gut=true generate

```



4. run lower commands



```bash

cd GENERATED_SERVER

go mod tidy

go mod download

go run cmd/api/main.go

```



## CLI



```

Flags:

  -config		Specify path to the gomarvin config file (default "gomarvin.json")

  -dangerous-regen	Regenerate everything. If set to true, init server will be regenerated and all previous changes will be lost (default "false")

  -gut            generate additional file in the modules dir which concats all of the functions that convert possible response structs to typescript interfaces

```



### Generated Typescript fetch functions usage example



```js

// import the generated file

import * as gomarvin from "../../../chi_with_modules/public/gomarvin";

// or just import a single fetch function

import { GetUserById } from "../../../chi_with_modules/public/gomarvin";



// either use the default client created from

// the settings of the config file, or create a new one

// (useful when switching environments)

const defaultClient = gomarvin.defaultClient;



// api client when deployed

const productionClient: gomarvin.Client = {

  host_url: "http://example.com",

  api_prefix: "/api/v1",

  headers: {

    "Content-type": "application/json;charset=UTF-8",

  },

};



const DEV_MODE = true;



// switch to productionClient if DEV_MODE is false

const client = DEV_MODE ? defaultClient : productionClient;



// fetch GetUserById endpoint

async function FetchGetUsersById() {

  const res = await gomarvin.GetUserById(client, 10);

  console.log(res);

}



// append optional string to the existing endpoint url

async function FetchEndpointWithAppendedUrl() {

  const res = await gomarvin.GetUserById(client, 10, {

    append_url: "?name=jim",

  });

  console.log(res);

}



// define custom options for the fetch request

async function FetchEndpointWithCustomOptions() {

  const res = await gomarvin.GetUserById(client, 10, {

    options: { method: "POST" },

  });

  console.log(res);

}



// Use both optional values

// - append a string to the fetch url

// - define a new options object used in the fetch request

async function FetchWithAppendedUrlAndCustomOptions() {

  const res = await gomarvin.GetUserById(client, 10, {

    options: { method: "DELETE" },

    append_url: "?name=jim",

  });

  console.log(res);

}

```



### Generated Python fetch functions usage example



```python

import gomarvin as gomarvin



# use the default localhost client

client = gomarvin.defaultClient



# fetch get users by id endpoint

def get_users_by_id():

  res = gomarvin.UserEndpoints(client).GetUserById(1)

  print(res.json())



# make a post request to the register user endpoint with a body

def register_user():

  body = gomarvin.CreateUserBody(

        username="jim", password="very-long-password", email="[email protected]")

  res = gomarvin.UserEndpoints(client).CreateUser(body=body)

  print(res.json())



# append a string to the url

def get_users_with_params():

  data = gomarvin.UserEndpoints(client).GetUsers(append_url="?name=jim") 

  print(res.json())



```



### Notes



- Gin crashes by default. This is due to the way the framework handles routing.



- bugs caused by url params and routing should be fixed manually.



- Seeding the db

  - As the generated fetch functions are mapped to the endpoints, you can use them to seed the database pretty easily. Using deno with the faker package can make the process trivial.

- If formatting does not work for some reason, run this



  ```

  gofmt -s -w .

  ```



- Using the tool to generate fetch functions for pre-existing REST APIs



  - If you want to generate a client for an already existing REST API in a fast way, you can use the editor to document the needed values to codegen the fetch functions in a fast way



- If there are errors after creating a new config file, submit an issue. There might be some edge cases that have not been tested yet.



### Credits to used packages



_Not installed locally to avoid any dependencies._



- [go-pluralize](https://github.com/gertd/go-pluralize)

- [strcase](https://github.com/iancoleman/strcase)