state

state

Minimalistic package for handling a Go application State with a Database and Cache

Features

• Use a single API to manage your application Database and Cache

• Git like interface where you stage changes, commit them and revert them.

• Easily extended with other caches or databases, just need to implement a single interface

Usage

State API

Import the library:

import "github.com/vanclief/state/manager"

Creating a new State:

state, err := manager.New(db, cache) // Using both a Database and Cache
state, err := manager.New(db, nil) // Just using Database 
state, err := manager.New(nil, cache) // Just using Cache 

Staging changes:

i := user.New("1", "Franco", "email@francovalencia.com") // Your model here

state.Stage(i, "insert") // This stages User "i" to be inserted
state.Stage(u, "update") // This stages User "u" to be updated
state.Stage(d, "delete") // This stages User "d" to be deleted

Commit changes:

err := state.Commit() // Applies all staged changes
if err != nil {
    // Handle that one or more changes where not applied
}

Rollback applied insertions:

err := state.Rollback() // Reverts applied "insert" changes
if err != nil {
    // Handle that one or more inserts could not be reverted 
}

Clear staged changes:

state.Clear() // Clears all staged changes

Display staged changes:

changes := state.Status() 
for _, change := range changes {
    fmt.Println("Model:", change.model, "OP:", change.op, "Status:", change.status, "Error:", change.err)
	}
}

Display applied changes:

applied := state.Applied() 
for _, change := range applied {
    fmt.Println("Model:", change.model, "OP:", change.op, "Status:", change.status, "Error:", change.err)
	}
}

Get a model using its ID:

u := &user.User{}
state.Get(u, "1")
fmt.Println(u) // {"1", "Franco", "email@francovalencia.com"}

Query the database for a single model:

u := &user.User{}
state.QueryOne(u, `email = 'email@francovalencia.com'`)
fmt.Println(u) // {"1", "Franco", "email@francovalencia.com"}

Query format will depend of your database

Query the database for multiple models:

users := []user.User{}
state.QueryOne(users, , `name = 'John'`)
fmt.Println(users[0]) // {"2", "John", "john@wick.com"}
fmt.Println(users[1]) // {"3", "John", "john@cena.com"}

Query format will depend of your database

Models

Your models should implement the interfaces.Model interface, you can check examplemodels to see how this is done.

Database Interface

Your database should implement the interfaces.Database interface, check the folder databases for examples.

Cache Interface

Your cache should implement the interfaces.Cache interface, check the folder caches for examples.

Contributions

Feel free to open a PR or an Issue.