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handlers.go
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handlers.go
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package request
// A Handlers provides a collection of request handlers for various
// stages of handling requests.
type Handlers struct {
Validate HandlerList
Build HandlerList
Sign HandlerList
Send HandlerList
ValidateResponse HandlerList
Unmarshal HandlerList
UnmarshalMeta HandlerList
UnmarshalError HandlerList
Retry HandlerList
AfterRetry HandlerList
}
// Copy returns of this handler's lists.
func (h *Handlers) Copy() Handlers {
return Handlers{
Validate: h.Validate.copy(),
Build: h.Build.copy(),
Sign: h.Sign.copy(),
Send: h.Send.copy(),
ValidateResponse: h.ValidateResponse.copy(),
Unmarshal: h.Unmarshal.copy(),
UnmarshalError: h.UnmarshalError.copy(),
UnmarshalMeta: h.UnmarshalMeta.copy(),
Retry: h.Retry.copy(),
AfterRetry: h.AfterRetry.copy(),
}
}
// Clear removes callback functions for all handlers
func (h *Handlers) Clear() {
h.Validate.Clear()
h.Build.Clear()
h.Send.Clear()
h.Sign.Clear()
h.Unmarshal.Clear()
h.UnmarshalMeta.Clear()
h.UnmarshalError.Clear()
h.ValidateResponse.Clear()
h.Retry.Clear()
h.AfterRetry.Clear()
}
// A HandlerList manages zero or more handlers in a list.
type HandlerList struct {
list []NamedHandler
}
// A NamedHandler is a struct that contains a name and function callback.
type NamedHandler struct {
Name string
Fn func(*Request)
}
// copy creates a copy of the handler list.
func (l *HandlerList) copy() HandlerList {
var n HandlerList
n.list = append([]NamedHandler{}, l.list...)
return n
}
// Clear clears the handler list.
func (l *HandlerList) Clear() {
l.list = []NamedHandler{}
}
// Len returns the number of handlers in the list.
func (l *HandlerList) Len() int {
return len(l.list)
}
// PushBack pushes handler f to the back of the handler list.
func (l *HandlerList) PushBack(f func(*Request)) {
l.list = append(l.list, NamedHandler{"__anonymous", f})
}
// PushFront pushes handler f to the front of the handler list.
func (l *HandlerList) PushFront(f func(*Request)) {
l.list = append([]NamedHandler{{"__anonymous", f}}, l.list...)
}
// PushBackNamed pushes named handler f to the back of the handler list.
func (l *HandlerList) PushBackNamed(n NamedHandler) {
l.list = append(l.list, n)
}
// PushFrontNamed pushes named handler f to the front of the handler list.
func (l *HandlerList) PushFrontNamed(n NamedHandler) {
l.list = append([]NamedHandler{n}, l.list...)
}
// Remove removes a NamedHandler n
func (l *HandlerList) Remove(n NamedHandler) {
newlist := []NamedHandler{}
for _, m := range l.list {
if m.Name != n.Name {
newlist = append(newlist, m)
}
}
l.list = newlist
}
// Run executes all handlers in the list with a given request object.
func (l *HandlerList) Run(r *Request) {
for _, f := range l.list {
f.Fn(r)
}
}