create import driver (not finished)

This commit is contained in:
Adrien Marquès 2018-09-29 17:01:58 +02:00
parent 5db546e964
commit c51281c731
2 changed files with 153 additions and 0 deletions

113
driver/import.go Normal file
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@ -0,0 +1,113 @@
package driver
import (
"errors"
"fmt"
e "git.xdrm.io/go/aicra/err"
"git.xdrm.io/go/aicra/response"
"net/http"
"plugin"
"strings"
)
// Name returns the driver name
func (d *Import) Name() string { return "import" }
// RegisterController registers a new controller
func (d *Import) RegisterController(_path string, _controller Controller) error {
// 1. init controllers if not already
if d.Controllers == nil {
d.Controllers = make(map[string]Controller)
}
// 2. fail if no controller
if _controller == nil {
return errors.New("nil controller")
}
// 3. Fail on invalid path
if len(_path) < 1 || _path[0] != '/' {
return errors.New("invalid controller path")
}
// 4. Store controller
d.Controllers[_path] = _controller
return nil
}
// RegisterMiddleware registers a new controller
func (d *Import) RegisterMiddlware(_path string, _middleware Middleware) error {
// 1. init imddlewares if not already
if d.Middlewares == nil {
d.Middlewares = make(map[string]Middleware)
}
// 2. fail if no imddleware
if _middleware == nil {
return errors.New("nil imddleware")
}
// 3. Fail on invalid path
if len(_path) < 1 || _path[0] != '/' {
return errors.New("invalid imddleware path")
}
// 4. Store imddleware
d.Middlewares[_path] = _middleware
return nil
}
// RunController implements the Driver interface
func (d *Import) RunController(_path []string, _method string) (func(response.Arguments) response.Response, err.Error) {
/* (1) Build controller path */
path := strings.Join(_path, "-")
/* (2) Check if controller exists */
controller, ok := d.Controllers[path]
if !ok {
return nil, e.UncallableController
}
/* (3) Format method */
method := strings.ToLower(_method)
/* (4) Return method according to method */
switch method {
case "GET":
return controller.Get, e.Success
case "POST":
return controller.Post, e.Success
case "PUT":
return controller.Put, e.Success
case "DELETE":
return controller.Delete, e.Success
default:
return nil, e.UncallableMethod
}
return nil, e.UncallableController
}
// LoadMiddleware returns a new middleware function; it must be a
// valid and existing folder/filename file with the .so extension
func (d *Import) LoadMiddleware(_path string) (func(http.Request, *[]string), error) {
/* (1) Check plugin name */
if len(_path) < 1 {
return nil, errors.New("middleware name must not be empty")
}
/* (2) Check if middleware exists */
middleware, ok := d.Middlewares[_path]
if !ok {
return nil, errors.New("middleware not found")
}
/* (3) Return middleware */
return mware, nil
}

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@ -25,6 +25,46 @@ type Driver interface {
// - the a/b/c controller executable must be named <WORKDIR>/controller/a/b/c
type Generic struct{}
// Controller is the interface that controller implementation must follow
// it is used by the 'Import' driver
type Controller interface {
Get(d response.Arguments) response.Response
Post(d response.Arguments) response.Response
Put(d response.Arguments) response.Response
Delete(d response.Arguments) response.Response
}
// Middleware is the interface that middleware implementation must follow
// it is used by the 'Import' driver
type Middleware interface {
Inspect(http.Request, *[]string)
}
// Import tells the aicra instance to use the import driver to load controller/middleware executables
//
// It will compile imported with the following interface :
//
// type Controller interface {
// Get(d response.Arguments) response.Response
// Post(d response.Arguments) response.Response
// Put(d response.Arguments) response.Response
// Delete(d response.Arguments) response.Response
// }
//
// CONTROLLER FILE STRUCTURE
// --------------
// - the root (/) controller executable must be named <WORKDIR>/controller/ROOT.go
// - the a/b/c controller executable must be named <WORKDIR>/controller/a/b/c.go
//
// COMPILATION
// -----------
// The controllers/middlewares are imported and instanciated inside the main function, they are
// thus compiled with the main binary file
type Import struct {
Controllers map[string]Controller
Middlewares map[string]Middleware
}
// Plugin tells the aicra instance to use the plugin driver to load controller/middleware executables
//
// It will load go .so plugins with the following interface :