API WITH POSTGRESQL

Firts attempts with Golang

A small test to learn about go, go modules and the standard go project layout

Pourpose

The idea was to do some code able to receive a GET and a POST saving some data into a Database without geeting depper into it and skipping testing. Also no validations are done in the Db Repository like checks for duplicated IDS and so on...

Second iteration

Implement more or less a data 'repository'
Working with injection
Endpoint testing using echo and gomock
Repo testing with gomock and pgxmock
Avoid data mutability and parameter validation (Not go compilant)

Third iteration

Service Layer

Fourth iteration

Using context to define DB query timeout value
Middleware implemented to keep track stats

Installation and SetUp

Download and install Golang. Donwload and install PostgreSQL. On PostgreSQL up and running use this script to create and add a new table into a database

CREATE TABLE IF NOT EXISTS public.movies
(
    id integer NOT NULL DEFAULT nextval('movies_id_seq'::regclass),
    movie_name text COLLATE pg_catalog."default",
    genre text COLLATE pg_catalog."default",
    duration text COLLATE pg_catalog."default",
    CONSTRAINT movies_pkey PRIMARY KEY (id)
)

Replace in repository.go ln 12 the with your PostgreSQL data

const (
	DbConn = "user=<your_user> password=<your_password> dbname=<your_database> sslmode=disable"
)

URLS and Inspiration

[https://github.com/golang-standards/project-layout]

[https://blog.golang.org/using-go-modules]

[https://www.calhoun.io/inserting-records-into-a-postgresql-database-with-gos-database-sql-package/]

[https://duythhuynh.medium.com/gomock-unit-testing-made-easy-b59a0e947ba7]

[https://echo.labstack.com/guide/testing/]

[https://blog.golang.org/context]

Modules Used

Module	Url
Echo	[https://github.com/labstack/echo]
PGX	[https://github.com/jackc/pgx]
GoMock	[https://github.com/golang/mock]
PGXMock	[https://github.com/pashagolub/pgxmock]
Testify	[https://github.com/stretchr/testify]

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.