functions: hot containers (#332)

* functions: modify datastore to accomodate hot containers support

* functions: protocol between functions and hot containers

* functions: add hot containers clockwork

* fn: add hot containers support

api/models/route.go

@@ -25,19 +25,22 @@ var (
 type Routes []*Route
 
 type Route struct {
-	AppName string      `json:"app_name,omitempty"`
-	Path    string      `json:"path,omitempty"`
-	Image   string      `json:"image,omitempty"`
-	Memory  uint64      `json:"memory,omitempty"`
-	Headers http.Header `json:"headers,omitempty"`
-	Type    string      `json:"type,omitempty"`
-	Config  `json:"config"`
+	AppName        string      `json:"app_name,omitempty"`
+	Path           string      `json:"path,omitempty"`
+	Image          string      `json:"image,omitempty"`
+	Memory         uint64      `json:"memory,omitempty"`
+	Headers        http.Header `json:"headers,omitempty"`
+	Type           string      `json:"type,omitempty"`
+	Format         string      `json:"format,omitempty"`
+	MaxConcurrency int         `json:"max_concurrency,omitempty"`
+	Config         `json:"config"`
 }
 
 var (
 	ErrRoutesValidationFoundDynamicURL = errors.New("Dynamic URL is not allowed")
 	ErrRoutesValidationInvalidPath     = errors.New("Invalid Path format")
 	ErrRoutesValidationInvalidType     = errors.New("Invalid route Type")
+	ErrRoutesValidationInvalidFormat   = errors.New("Invalid route Format")
 	ErrRoutesValidationMissingAppName  = errors.New("Missing route AppName")
 	ErrRoutesValidationMissingImage    = errors.New("Missing route Image")
 	ErrRoutesValidationMissingName     = errors.New("Missing route Name")
@@ -82,6 +85,14 @@ func (r *Route) Validate() error {
 		res = append(res, ErrRoutesValidationInvalidType)
 	}
 
+	if r.Format != FormatDefault && r.Format != FormatHTTP {
+		res = append(res, ErrRoutesValidationInvalidFormat)
+	}
+
+	if r.MaxConcurrency == 0 && r.Format == FormatHTTP {
+		r.MaxConcurrency = 1
+	}
+
 	if len(res) > 0 {
 		return apiErrors.CompositeValidationError(res...)
 	}

api/models/task.go

@@ -21,6 +21,13 @@ const (
 	TypeAsync = "async"
 )
 
+const (
+	// FormatDefault ...
+	FormatDefault = ""
+	// FormatHTTP ...
+	FormatHTTP = "http"
+)
+
 /*Task task
 
 swagger:model Task