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* Bump go-fastly to v1.7.0 * Add golang-petname dep * Add NullProgress writer * Add UndoStack to pkg/common * Persist user email to global config file * Make `compute init` accept input interactively and add logic to provision service, domain and backend during initialization. * Surpress gosec G307 on file.Close() defers * Add RunIfError method to UndoStack which unwinds the stack if passed an error * Add text.Description() output helper to print term:description groupings. * Refactor compute init to use new helpers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| package common | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| ) | ||
|
|
||
| // UndoFn is a function with no arguments which returns an error or nil. | ||
| type UndoFn func() error | ||
|
|
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| // UndoStack models a simple undo stack which consumers can use to store undo | ||
| // stateful functions, such as a function to teardown API state if something | ||
| // goes wrong during procedural commands, for example deleting a Fastly service | ||
| // after it's been created. | ||
| type UndoStack struct { | ||
| states []UndoFn | ||
| } | ||
|
|
||
| // NewUndoStack constructs a new UndoStack. | ||
| func NewUndoStack() *UndoStack { | ||
| s := make([]UndoFn, 0, 1) | ||
| stack := &UndoStack{ | ||
| states: s, | ||
| } | ||
| return stack | ||
| } | ||
|
|
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| // Pop method pops last added UndoFn element oof the stack and returns it. | ||
| // If stack is empty Pop() returns nil. | ||
| func (s *UndoStack) Pop() UndoFn { | ||
| n := len(s.states) | ||
| if n == 0 { | ||
| return nil | ||
| } | ||
| v := s.states[n-1] | ||
| s.states = s.states[:n-1] | ||
| return v | ||
| } | ||
|
|
||
| // Push method pushes an Undoer element onto the UndoStack. | ||
| func (s *UndoStack) Push(elem UndoFn) { | ||
| s.states = append(s.states, elem) | ||
| } | ||
|
|
||
| // Len method returns the number of elements in the UndoStack. | ||
| func (s *UndoStack) Len() int { | ||
| return len(s.states) | ||
| } | ||
|
|
||
| // RunIfError unwinds the stack if a non-nil error is passed, by serially | ||
| // calling each UndoFn function state in FIFO order. If any UndoFn returns an | ||
| // error, it gets logged to the provided writer. Should be deferrerd, such as: | ||
| // | ||
| // undoStack := common.NewUndoStack() | ||
| // defer undoStack.RunIfError(w, err) | ||
| // | ||
| func (s *UndoStack) RunIfError(w io.Writer, err error) { | ||
| if err == nil { | ||
| return | ||
| } | ||
| for i := len(s.states) - 1; i >= 0; i-- { | ||
| if err := s.states[i](); err != nil { | ||
| fmt.Fprintf(w, "%w", err) | ||
| } | ||
| } | ||
| } |
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