mg-transport-core/README.md

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## MG Transport Library
[![Build Status](https://travis-ci.org/retailcrm/mg-transport-core.svg?branch=master)](https://travis-ci.org/retailcrm/mg-transport-core)
[![codecov](https://codecov.io/gh/retailcrm/mg-transport-core/branch/master/graph/badge.svg)](https://codecov.io/gh/retailcrm/mg-transport-core)
[![pkg.go.dev](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white)](https://pkg.go.dev/github.com/retailcrm/mg-transport-core/core)
[![Go Report Card](https://goreportcard.com/badge/github.com/retailcrm/mg-transport-core)](https://goreportcard.com/report/github.com/retailcrm/mg-transport-core)
[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/retailcrm/mg-transport-core/blob/master/LICENSE.md)
This library provides different functions like error-reporting, logging, localization, etc. in order to make it easier to create transports.
Usage:
```go
package main
import (
"os"
"fmt"
"html/template"
"github.com/gin-gonic/gin"
"github.com/gobuffalo/packr/v2"
"github.com/retailcrm/mg-transport-core/core"
)
func main() {
// Create new core.Engine instance
app := core.New()
// Load configuration
app.Config = core.NewConfig("config.yml")
// Set default error translation key (will be returned if something goes wrong)
app.DefaultError = "unknown_error"
// Set translations path
app.TranslationsPath = "./translations"
// Preload some translations so they will not be loaded for every request
app.PreloadLanguages = core.DefaultLanguages
// Configure gin.Engine inside core.Engine
app.ConfigureRouter(func(engine *gin.Engine) {
engine.Static("/static", "./static")
engine.HTMLRender = app.CreateRenderer(
] // Insert templates here. Custom functions also can be provided.
// Default transl function will be injected automatically
func(renderer *core.Renderer) {
// Push method will load template from FS or from binary
r.Push("home", "templates/layout.html", "templates/home.html")
},
template.FuncMap{},
)
})
// Start application or fail if something gone wrong (e.g. port is already in use)
if err := app.Prepare().Run(); err != nil {
fmt.Printf("Fatal error: %s", err.Error())
os.Exit(1)
}
}
```
### Resource embedding
[packr](https://github.com/gobuffalo/packr/tree/master/v2) can be used to provide resource embedding. In order to use packr you must follow
[this instruction](https://github.com/gobuffalo/packr/tree/master/v2#library-installation), and provide boxes with templates,
translations and assets to library. Example:
```go
package main
import (
"os"
"fmt"
"html/template"
"github.com/gin-gonic/gin"
"github.com/gobuffalo/packr/v2"
"github.com/retailcrm/mg-transport-core/core"
)
func main() {
static := packr.New("assets", "./static")
templates := packr.New("templates", "./templates")
translations := packr.New("translations", "./translate")
app := core.New()
app.Config = core.NewConfig("config.yml")
app.DefaultError = "unknown_error"
// Now translations will be loaded from packr.Box
app.TranslationsBox = translations
app.PreloadLanguages = core.DefaultLanguages
app.ConfigureRouter(func(engine *gin.Engine) {
// gin.Engine can use packr.Box as http.FileSystem
engine.StaticFS("/static", static)
engine.HTMLRender = app.CreateRendererFS(
templates,
func(renderer *core.Renderer) {
// Same Push method here, but without relative directory.
r.Push("home", "layout.html", "home.html")
},
template.FuncMap{},
)
})
if err := app.Prepare().Run(); err != nil {
fmt.Printf("Fatal error: %s", err.Error())
os.Exit(1)
}
}
```
### Migration generator
This library contains helper tool for transports. You can install it via go:
```sh
$ go get -u github.com/retailcrm/mg-transport-core/cmd/transport-core-tool
```
Currently, it only can generate new migrations for your transport.