Initial commit

service/container.go

@@ -0,0 +1,43 @@
+package service
+
+import (
+	"errors"
+)
+
+var (
+	// ErrNotImplemented is the error when a service is accessed
+	// and no implementation was provided
+	ErrNotImplemented = errors.New("service not implemented")
+)
+
+// Provider is a provider for a service
+type Provider func(ctn *Container) (interface{}, error)
+
+// Container is a simple service container for dependency injection
+type Container struct {
+	providers map[Name]Provider
+}
+
+// Name is a name of a service
+type Name string
+
+// Provide registers a provider for the survey.Service
+func (c *Container) Provide(name Name, provider Provider) {
+	c.providers[name] = provider
+}
+
+// Service retrieves a service implementation based on its name
+func (c *Container) Service(name Name) (interface{}, error) {
+	provider, exists := c.providers[name]
+	if !exists {
+		return nil, ErrNotImplemented
+	}
+	return provider(c)
+}
+
+// NewContainer returns a new empty service container
+func NewContainer() *Container {
+	return &Container{
+		providers: make(map[Name]Provider),
+	}
+}

service/session/flash.go

@@ -0,0 +1,43 @@
+package session
+
+const (
+	// FlashError defines an "error" flash message
+	FlashError FlashType = "error"
+	// FlashWarn defines an "warning" flash message
+	FlashWarn FlashType = "warn"
+	// FlashSuccess defines an "success" flash message
+	FlashSuccess FlashType = "success"
+	// FlashInfo defines an "info" flash message
+	FlashInfo FlashType = "info"
+)
+
+// FlashType defines the type of a flash message
+type FlashType string
+
+// Flash is a ephemeral message that lives in a session
+// until it's read
+type Flash interface {
+	Type() FlashType
+	Message() string
+}
+
+// BaseFlash is a base implementation of a flash message
+type BaseFlash struct {
+	flashType FlashType
+	message   string
+}
+
+// Type returns the type of the flash
+func (f *BaseFlash) Type() FlashType {
+	return f.flashType
+}
+
+// Message returns the message of the flash
+func (f *BaseFlash) Message() string {
+	return f.message
+}
+
+// NewBaseFlash returns a new BaseFlash
+func NewBaseFlash(flashType FlashType, message string) *BaseFlash {
+	return &BaseFlash{flashType, message}
+}

service/session/service.go

@@ -0,0 +1,38 @@
+package session
+
+import (
+	"net/http"
+
+	"forge.cadoles.com/wpetit/goweb/service"
+	"github.com/pkg/errors"
+)
+
+// ServiceName defines the Session service name
+const ServiceName service.Name = "session"
+
+// Service defines the API of a "http session" service
+type Service interface {
+	Get(http.ResponseWriter, *http.Request) (Session, error)
+}
+
+// From retrieves the session service in the given container
+func From(container *service.Container) (Service, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+	sessionService, ok := service.(Service)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+	return sessionService, nil
+}
+
+// Must retrieves the session service in the given container or panic otherwise
+func Must(container *service.Container) Service {
+	service, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+	return service
+}

service/session/session.go

@@ -0,0 +1,16 @@
+package session
+
+import (
+	"net/http"
+)
+
+// Session defines the API of a Session
+type Session interface {
+	Set(string, interface{})
+	Unset(string)
+	Get(string) interface{}
+	AddFlash(flashType FlashType, message string)
+	Flashes(flashTypes ...FlashType) []Flash
+	Save(http.ResponseWriter, *http.Request) error
+	Delete(http.ResponseWriter, *http.Request) error
+}

service/template/data.go

@@ -0,0 +1,19 @@
+package template
+
+// Data is some data to inject into the template
+type Data map[string]interface{}
+
+// DataExtFunc is some extensions to a template's data
+type DataExtFunc func(data Data) (Data, error)
+
+// Extend returns a template's data with the given extensions
+func Extend(data Data, extensions ...DataExtFunc) (Data, error) {
+	var err error
+	for _, ext := range extensions {
+		data, err = ext(data)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return data, nil
+}

service/template/service.go

@@ -0,0 +1,38 @@
+package template
+
+import (
+	"net/http"
+
+	"forge.cadoles.com/wpetit/goweb/service"
+	"github.com/pkg/errors"
+)
+
+// ServiceName defines the Tempate service name
+const ServiceName service.Name = "template"
+
+// Service is a templating service
+type Service interface {
+	RenderPage(w http.ResponseWriter, templateName string, data interface{}) error
+}
+
+// From retrieves the template service in the given container
+func From(container *service.Container) (Service, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+	templateService, ok := service.(Service)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+	return templateService, nil
+}
+
+// Must retrieves the template service in the given container or panic otherwise
+func Must(container *service.Container) Service {
+	service, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+	return service
+}