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module.go
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module.go
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package goadify
import (
"github.com/goadify/goadify/interfaces"
"github.com/goadify/goadify/modules/core"
"github.com/goadify/goadify/modules/navigation"
"github.com/pkg/errors"
"net/http"
)
var (
ErrModuleAlreadyLoaded = errors.New("module already loaded")
ErrPrefixNotStartingWithSlash = errors.New("module's http prefix must starts with slash")
ErrPrefixEndsWithSlash = errors.New("module's http prefix must NOT ends with slash")
autoloadModules = []interfaces.ExtendedModule{
core.New(),
navigation.New(),
}
)
type moduleMaster struct {
mux *http.ServeMux
logger interfaces.Logger
devModeEnabled bool
ordinaryModules []interfaces.OrdinaryModule
ordinaryModulesMap map[string]interfaces.OrdinaryModule
extendedModules []interfaces.ExtendedModule
extendedModulesMap map[string]interfaces.ExtendedModule
}
type dependencyProvider struct {
logger interfaces.Logger
devModeEnabled bool
}
type extendedDependencyProvider struct {
dependencyProvider
modules []interfaces.Module
}
func (d *dependencyProvider) Logger() interfaces.Logger {
return d.logger
}
func (d *dependencyProvider) DevModeEnabled() bool {
return d.devModeEnabled
}
func (d *extendedDependencyProvider) Modules() []interfaces.Module {
return d.modules
}
func (mm *moduleMaster) prepare() error {
mm.mux = http.NewServeMux()
mm.extendedModules = append(mm.extendedModules, autoloadModules...)
mm.ordinaryModulesMap = make(map[string]interfaces.OrdinaryModule)
for _, module := range mm.ordinaryModules {
moduleName := module.Name()
if _, ok := mm.ordinaryModulesMap[moduleName]; ok {
return errors.Wrap(ErrModuleAlreadyLoaded, moduleName)
}
mm.ordinaryModulesMap[moduleName] = module
}
mm.extendedModulesMap = make(map[string]interfaces.ExtendedModule)
for _, module := range mm.extendedModules {
moduleName := module.Name()
if _, ok := mm.extendedModulesMap[moduleName]; ok {
return errors.Wrap(ErrModuleAlreadyLoaded, moduleName)
}
mm.extendedModulesMap[moduleName] = module
}
return nil
}
func checkHttpModule(m interfaces.Module) error {
prefix := m.HttpPrefix()
if prefix[0] != '/' {
return ErrPrefixNotStartingWithSlash
}
if prefix[len(prefix)-1] == '/' {
return ErrPrefixEndsWithSlash
}
return nil
}
func (mm *moduleMaster) registerModuleHttp(module interfaces.Module) error {
err := checkHttpModule(module)
if err != nil {
return err
}
prefix := module.HttpPrefix()
handler, err := module.HttpHandler()
if err != nil {
return errors.Wrapf(err, "can not build module %s", module.Name())
}
mm.mux.Handle(
prefix+"/",
http.StripPrefix(prefix, handler),
)
return nil
}
func (mm *moduleMaster) loadModules() error {
dp := dependencyProvider{
logger: mm.logger,
devModeEnabled: mm.devModeEnabled,
}
for _, module := range mm.ordinaryModules {
err := module.Init(&dp)
if err != nil {
return errors.Wrap(err, module.Name())
}
if err := mm.registerModuleHttp(module); err != nil {
return errors.Wrap(err, module.Name())
}
}
var modules []interfaces.Module
for _, module := range mm.ordinaryModulesMap {
modules = append(modules, module)
}
for _, module := range mm.extendedModules {
modules = append(modules, module)
}
edp := &extendedDependencyProvider{
dependencyProvider: dp,
modules: modules,
}
for _, module := range mm.extendedModules {
err := module.Init(edp)
if err != nil {
return errors.Wrap(err, module.Name())
}
if err := mm.registerModuleHttp(module); err != nil {
return errors.Wrap(err, module.Name())
}
}
return nil
}
func (mm *moduleMaster) HttpHandler() http.Handler {
return mm.mux
}
func newModuleMaster(
logger interfaces.Logger,
devModeEnabled bool,
ordinaryModules []interfaces.OrdinaryModule,
extendedModules []interfaces.ExtendedModule,
) (*moduleMaster, error) {
mm := &moduleMaster{
logger: logger,
devModeEnabled: devModeEnabled,
ordinaryModules: ordinaryModules,
extendedModules: extendedModules,
}
err := mm.prepare()
if err != nil {
return nil, err
}
err = mm.loadModules()
if err != nil {
return nil, err
}
return mm, nil
}